2 * Copyright © 2008 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24 * Eric Anholt <eric@anholt.net>
29 #include <drm/drm_vma_manager.h>
30 #include <drm/i915_drm.h>
32 #include "i915_trace.h"
33 #include "intel_drv.h"
34 #include <linux/shmem_fs.h>
35 #include <linux/slab.h>
36 #include <linux/swap.h>
37 #include <linux/pci.h>
38 #include <linux/dma-buf.h>
40 static void i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj);
41 static void i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj,
43 static __must_check int
44 i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
46 static __must_check int
47 i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
48 struct i915_address_space *vm,
50 bool map_and_fenceable,
52 static int i915_gem_phys_pwrite(struct drm_device *dev,
53 struct drm_i915_gem_object *obj,
54 struct drm_i915_gem_pwrite *args,
55 struct drm_file *file);
57 static void i915_gem_write_fence(struct drm_device *dev, int reg,
58 struct drm_i915_gem_object *obj);
59 static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
60 struct drm_i915_fence_reg *fence,
63 static unsigned long i915_gem_inactive_count(struct shrinker *shrinker,
64 struct shrink_control *sc);
65 static unsigned long i915_gem_inactive_scan(struct shrinker *shrinker,
66 struct shrink_control *sc);
67 static unsigned long i915_gem_purge(struct drm_i915_private *dev_priv, long target);
68 static unsigned long i915_gem_shrink_all(struct drm_i915_private *dev_priv);
69 static void i915_gem_object_truncate(struct drm_i915_gem_object *obj);
71 static bool cpu_cache_is_coherent(struct drm_device *dev,
72 enum i915_cache_level level)
74 return HAS_LLC(dev) || level != I915_CACHE_NONE;
77 static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
79 if (!cpu_cache_is_coherent(obj->base.dev, obj->cache_level))
82 return obj->pin_display;
85 static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
88 i915_gem_release_mmap(obj);
90 /* As we do not have an associated fence register, we will force
91 * a tiling change if we ever need to acquire one.
93 obj->fence_dirty = false;
94 obj->fence_reg = I915_FENCE_REG_NONE;
97 /* some bookkeeping */
98 static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
101 spin_lock(&dev_priv->mm.object_stat_lock);
102 dev_priv->mm.object_count++;
103 dev_priv->mm.object_memory += size;
104 spin_unlock(&dev_priv->mm.object_stat_lock);
107 static void i915_gem_info_remove_obj(struct drm_i915_private *dev_priv,
110 spin_lock(&dev_priv->mm.object_stat_lock);
111 dev_priv->mm.object_count--;
112 dev_priv->mm.object_memory -= size;
113 spin_unlock(&dev_priv->mm.object_stat_lock);
117 i915_gem_wait_for_error(struct i915_gpu_error *error)
121 #define EXIT_COND (!i915_reset_in_progress(error) || \
122 i915_terminally_wedged(error))
127 * Only wait 10 seconds for the gpu reset to complete to avoid hanging
128 * userspace. If it takes that long something really bad is going on and
129 * we should simply try to bail out and fail as gracefully as possible.
131 ret = wait_event_interruptible_timeout(error->reset_queue,
135 DRM_ERROR("Timed out waiting for the gpu reset to complete\n");
137 } else if (ret < 0) {
145 int i915_mutex_lock_interruptible(struct drm_device *dev)
147 struct drm_i915_private *dev_priv = dev->dev_private;
150 ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
154 ret = mutex_lock_interruptible(&dev->struct_mutex);
158 WARN_ON(i915_verify_lists(dev));
163 i915_gem_object_is_inactive(struct drm_i915_gem_object *obj)
165 return i915_gem_obj_bound_any(obj) && !obj->active;
169 i915_gem_init_ioctl(struct drm_device *dev, void *data,
170 struct drm_file *file)
172 struct drm_i915_private *dev_priv = dev->dev_private;
173 struct drm_i915_gem_init *args = data;
175 if (drm_core_check_feature(dev, DRIVER_MODESET))
178 if (args->gtt_start >= args->gtt_end ||
179 (args->gtt_end | args->gtt_start) & (PAGE_SIZE - 1))
182 /* GEM with user mode setting was never supported on ilk and later. */
183 if (INTEL_INFO(dev)->gen >= 5)
186 mutex_lock(&dev->struct_mutex);
187 i915_gem_setup_global_gtt(dev, args->gtt_start, args->gtt_end,
189 dev_priv->gtt.mappable_end = args->gtt_end;
190 mutex_unlock(&dev->struct_mutex);
196 i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data,
197 struct drm_file *file)
199 struct drm_i915_private *dev_priv = dev->dev_private;
200 struct drm_i915_gem_get_aperture *args = data;
201 struct drm_i915_gem_object *obj;
205 mutex_lock(&dev->struct_mutex);
206 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
207 if (i915_gem_obj_is_pinned(obj))
208 pinned += i915_gem_obj_ggtt_size(obj);
209 mutex_unlock(&dev->struct_mutex);
211 args->aper_size = dev_priv->gtt.base.total;
212 args->aper_available_size = args->aper_size - pinned;
217 void *i915_gem_object_alloc(struct drm_device *dev)
219 struct drm_i915_private *dev_priv = dev->dev_private;
220 return kmem_cache_zalloc(dev_priv->slab, GFP_KERNEL);
223 void i915_gem_object_free(struct drm_i915_gem_object *obj)
225 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
226 kmem_cache_free(dev_priv->slab, obj);
230 i915_gem_create(struct drm_file *file,
231 struct drm_device *dev,
235 struct drm_i915_gem_object *obj;
239 size = roundup(size, PAGE_SIZE);
243 /* Allocate the new object */
244 obj = i915_gem_alloc_object(dev, size);
248 ret = drm_gem_handle_create(file, &obj->base, &handle);
249 /* drop reference from allocate - handle holds it now */
250 drm_gem_object_unreference_unlocked(&obj->base);
259 i915_gem_dumb_create(struct drm_file *file,
260 struct drm_device *dev,
261 struct drm_mode_create_dumb *args)
263 /* have to work out size/pitch and return them */
264 args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 64);
265 args->size = args->pitch * args->height;
266 return i915_gem_create(file, dev,
267 args->size, &args->handle);
271 * Creates a new mm object and returns a handle to it.
274 i915_gem_create_ioctl(struct drm_device *dev, void *data,
275 struct drm_file *file)
277 struct drm_i915_gem_create *args = data;
279 return i915_gem_create(file, dev,
280 args->size, &args->handle);
284 __copy_to_user_swizzled(char __user *cpu_vaddr,
285 const char *gpu_vaddr, int gpu_offset,
288 int ret, cpu_offset = 0;
291 int cacheline_end = ALIGN(gpu_offset + 1, 64);
292 int this_length = min(cacheline_end - gpu_offset, length);
293 int swizzled_gpu_offset = gpu_offset ^ 64;
295 ret = __copy_to_user(cpu_vaddr + cpu_offset,
296 gpu_vaddr + swizzled_gpu_offset,
301 cpu_offset += this_length;
302 gpu_offset += this_length;
303 length -= this_length;
310 __copy_from_user_swizzled(char *gpu_vaddr, int gpu_offset,
311 const char __user *cpu_vaddr,
314 int ret, cpu_offset = 0;
317 int cacheline_end = ALIGN(gpu_offset + 1, 64);
318 int this_length = min(cacheline_end - gpu_offset, length);
319 int swizzled_gpu_offset = gpu_offset ^ 64;
321 ret = __copy_from_user(gpu_vaddr + swizzled_gpu_offset,
322 cpu_vaddr + cpu_offset,
327 cpu_offset += this_length;
328 gpu_offset += this_length;
329 length -= this_length;
335 /* Per-page copy function for the shmem pread fastpath.
336 * Flushes invalid cachelines before reading the target if
337 * needs_clflush is set. */
339 shmem_pread_fast(struct page *page, int shmem_page_offset, int page_length,
340 char __user *user_data,
341 bool page_do_bit17_swizzling, bool needs_clflush)
346 if (unlikely(page_do_bit17_swizzling))
349 vaddr = kmap_atomic(page);
351 drm_clflush_virt_range(vaddr + shmem_page_offset,
353 ret = __copy_to_user_inatomic(user_data,
354 vaddr + shmem_page_offset,
356 kunmap_atomic(vaddr);
358 return ret ? -EFAULT : 0;
362 shmem_clflush_swizzled_range(char *addr, unsigned long length,
365 if (unlikely(swizzled)) {
366 unsigned long start = (unsigned long) addr;
367 unsigned long end = (unsigned long) addr + length;
369 /* For swizzling simply ensure that we always flush both
370 * channels. Lame, but simple and it works. Swizzled
371 * pwrite/pread is far from a hotpath - current userspace
372 * doesn't use it at all. */
373 start = round_down(start, 128);
374 end = round_up(end, 128);
376 drm_clflush_virt_range((void *)start, end - start);
378 drm_clflush_virt_range(addr, length);
383 /* Only difference to the fast-path function is that this can handle bit17
384 * and uses non-atomic copy and kmap functions. */
386 shmem_pread_slow(struct page *page, int shmem_page_offset, int page_length,
387 char __user *user_data,
388 bool page_do_bit17_swizzling, bool needs_clflush)
395 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
397 page_do_bit17_swizzling);
399 if (page_do_bit17_swizzling)
400 ret = __copy_to_user_swizzled(user_data,
401 vaddr, shmem_page_offset,
404 ret = __copy_to_user(user_data,
405 vaddr + shmem_page_offset,
409 return ret ? - EFAULT : 0;
413 i915_gem_shmem_pread(struct drm_device *dev,
414 struct drm_i915_gem_object *obj,
415 struct drm_i915_gem_pread *args,
416 struct drm_file *file)
418 char __user *user_data;
421 int shmem_page_offset, page_length, ret = 0;
422 int obj_do_bit17_swizzling, page_do_bit17_swizzling;
424 int needs_clflush = 0;
425 struct sg_page_iter sg_iter;
427 user_data = to_user_ptr(args->data_ptr);
430 obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
432 if (!(obj->base.read_domains & I915_GEM_DOMAIN_CPU)) {
433 /* If we're not in the cpu read domain, set ourself into the gtt
434 * read domain and manually flush cachelines (if required). This
435 * optimizes for the case when the gpu will dirty the data
436 * anyway again before the next pread happens. */
437 needs_clflush = !cpu_cache_is_coherent(dev, obj->cache_level);
438 ret = i915_gem_object_wait_rendering(obj, true);
443 ret = i915_gem_object_get_pages(obj);
447 i915_gem_object_pin_pages(obj);
449 offset = args->offset;
451 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
452 offset >> PAGE_SHIFT) {
453 struct page *page = sg_page_iter_page(&sg_iter);
458 /* Operation in this page
460 * shmem_page_offset = offset within page in shmem file
461 * page_length = bytes to copy for this page
463 shmem_page_offset = offset_in_page(offset);
464 page_length = remain;
465 if ((shmem_page_offset + page_length) > PAGE_SIZE)
466 page_length = PAGE_SIZE - shmem_page_offset;
468 page_do_bit17_swizzling = obj_do_bit17_swizzling &&
469 (page_to_phys(page) & (1 << 17)) != 0;
471 ret = shmem_pread_fast(page, shmem_page_offset, page_length,
472 user_data, page_do_bit17_swizzling,
477 mutex_unlock(&dev->struct_mutex);
479 if (likely(!i915_prefault_disable) && !prefaulted) {
480 ret = fault_in_multipages_writeable(user_data, remain);
481 /* Userspace is tricking us, but we've already clobbered
482 * its pages with the prefault and promised to write the
483 * data up to the first fault. Hence ignore any errors
484 * and just continue. */
489 ret = shmem_pread_slow(page, shmem_page_offset, page_length,
490 user_data, page_do_bit17_swizzling,
493 mutex_lock(&dev->struct_mutex);
496 mark_page_accessed(page);
501 remain -= page_length;
502 user_data += page_length;
503 offset += page_length;
507 i915_gem_object_unpin_pages(obj);
513 * Reads data from the object referenced by handle.
515 * On error, the contents of *data are undefined.
518 i915_gem_pread_ioctl(struct drm_device *dev, void *data,
519 struct drm_file *file)
521 struct drm_i915_gem_pread *args = data;
522 struct drm_i915_gem_object *obj;
528 if (!access_ok(VERIFY_WRITE,
529 to_user_ptr(args->data_ptr),
533 ret = i915_mutex_lock_interruptible(dev);
537 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
538 if (&obj->base == NULL) {
543 /* Bounds check source. */
544 if (args->offset > obj->base.size ||
545 args->size > obj->base.size - args->offset) {
550 /* prime objects have no backing filp to GEM pread/pwrite
553 if (!obj->base.filp) {
558 trace_i915_gem_object_pread(obj, args->offset, args->size);
560 ret = i915_gem_shmem_pread(dev, obj, args, file);
563 drm_gem_object_unreference(&obj->base);
565 mutex_unlock(&dev->struct_mutex);
569 /* This is the fast write path which cannot handle
570 * page faults in the source data
574 fast_user_write(struct io_mapping *mapping,
575 loff_t page_base, int page_offset,
576 char __user *user_data,
579 void __iomem *vaddr_atomic;
581 unsigned long unwritten;
583 vaddr_atomic = io_mapping_map_atomic_wc(mapping, page_base);
584 /* We can use the cpu mem copy function because this is X86. */
585 vaddr = (void __force*)vaddr_atomic + page_offset;
586 unwritten = __copy_from_user_inatomic_nocache(vaddr,
588 io_mapping_unmap_atomic(vaddr_atomic);
593 * This is the fast pwrite path, where we copy the data directly from the
594 * user into the GTT, uncached.
597 i915_gem_gtt_pwrite_fast(struct drm_device *dev,
598 struct drm_i915_gem_object *obj,
599 struct drm_i915_gem_pwrite *args,
600 struct drm_file *file)
602 drm_i915_private_t *dev_priv = dev->dev_private;
604 loff_t offset, page_base;
605 char __user *user_data;
606 int page_offset, page_length, ret;
608 ret = i915_gem_obj_ggtt_pin(obj, 0, true, true);
612 ret = i915_gem_object_set_to_gtt_domain(obj, true);
616 ret = i915_gem_object_put_fence(obj);
620 user_data = to_user_ptr(args->data_ptr);
623 offset = i915_gem_obj_ggtt_offset(obj) + args->offset;
626 /* Operation in this page
628 * page_base = page offset within aperture
629 * page_offset = offset within page
630 * page_length = bytes to copy for this page
632 page_base = offset & PAGE_MASK;
633 page_offset = offset_in_page(offset);
634 page_length = remain;
635 if ((page_offset + remain) > PAGE_SIZE)
636 page_length = PAGE_SIZE - page_offset;
638 /* If we get a fault while copying data, then (presumably) our
639 * source page isn't available. Return the error and we'll
640 * retry in the slow path.
642 if (fast_user_write(dev_priv->gtt.mappable, page_base,
643 page_offset, user_data, page_length)) {
648 remain -= page_length;
649 user_data += page_length;
650 offset += page_length;
654 i915_gem_object_ggtt_unpin(obj);
659 /* Per-page copy function for the shmem pwrite fastpath.
660 * Flushes invalid cachelines before writing to the target if
661 * needs_clflush_before is set and flushes out any written cachelines after
662 * writing if needs_clflush is set. */
664 shmem_pwrite_fast(struct page *page, int shmem_page_offset, int page_length,
665 char __user *user_data,
666 bool page_do_bit17_swizzling,
667 bool needs_clflush_before,
668 bool needs_clflush_after)
673 if (unlikely(page_do_bit17_swizzling))
676 vaddr = kmap_atomic(page);
677 if (needs_clflush_before)
678 drm_clflush_virt_range(vaddr + shmem_page_offset,
680 ret = __copy_from_user_inatomic_nocache(vaddr + shmem_page_offset,
683 if (needs_clflush_after)
684 drm_clflush_virt_range(vaddr + shmem_page_offset,
686 kunmap_atomic(vaddr);
688 return ret ? -EFAULT : 0;
691 /* Only difference to the fast-path function is that this can handle bit17
692 * and uses non-atomic copy and kmap functions. */
694 shmem_pwrite_slow(struct page *page, int shmem_page_offset, int page_length,
695 char __user *user_data,
696 bool page_do_bit17_swizzling,
697 bool needs_clflush_before,
698 bool needs_clflush_after)
704 if (unlikely(needs_clflush_before || page_do_bit17_swizzling))
705 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
707 page_do_bit17_swizzling);
708 if (page_do_bit17_swizzling)
709 ret = __copy_from_user_swizzled(vaddr, shmem_page_offset,
713 ret = __copy_from_user(vaddr + shmem_page_offset,
716 if (needs_clflush_after)
717 shmem_clflush_swizzled_range(vaddr + shmem_page_offset,
719 page_do_bit17_swizzling);
722 return ret ? -EFAULT : 0;
726 i915_gem_shmem_pwrite(struct drm_device *dev,
727 struct drm_i915_gem_object *obj,
728 struct drm_i915_gem_pwrite *args,
729 struct drm_file *file)
733 char __user *user_data;
734 int shmem_page_offset, page_length, ret = 0;
735 int obj_do_bit17_swizzling, page_do_bit17_swizzling;
736 int hit_slowpath = 0;
737 int needs_clflush_after = 0;
738 int needs_clflush_before = 0;
739 struct sg_page_iter sg_iter;
741 user_data = to_user_ptr(args->data_ptr);
744 obj_do_bit17_swizzling = i915_gem_object_needs_bit17_swizzle(obj);
746 if (obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
747 /* If we're not in the cpu write domain, set ourself into the gtt
748 * write domain and manually flush cachelines (if required). This
749 * optimizes for the case when the gpu will use the data
750 * right away and we therefore have to clflush anyway. */
751 needs_clflush_after = cpu_write_needs_clflush(obj);
752 ret = i915_gem_object_wait_rendering(obj, false);
756 /* Same trick applies to invalidate partially written cachelines read
758 if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0)
759 needs_clflush_before =
760 !cpu_cache_is_coherent(dev, obj->cache_level);
762 ret = i915_gem_object_get_pages(obj);
766 i915_gem_object_pin_pages(obj);
768 offset = args->offset;
771 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents,
772 offset >> PAGE_SHIFT) {
773 struct page *page = sg_page_iter_page(&sg_iter);
774 int partial_cacheline_write;
779 /* Operation in this page
781 * shmem_page_offset = offset within page in shmem file
782 * page_length = bytes to copy for this page
784 shmem_page_offset = offset_in_page(offset);
786 page_length = remain;
787 if ((shmem_page_offset + page_length) > PAGE_SIZE)
788 page_length = PAGE_SIZE - shmem_page_offset;
790 /* If we don't overwrite a cacheline completely we need to be
791 * careful to have up-to-date data by first clflushing. Don't
792 * overcomplicate things and flush the entire patch. */
793 partial_cacheline_write = needs_clflush_before &&
794 ((shmem_page_offset | page_length)
795 & (boot_cpu_data.x86_clflush_size - 1));
797 page_do_bit17_swizzling = obj_do_bit17_swizzling &&
798 (page_to_phys(page) & (1 << 17)) != 0;
800 ret = shmem_pwrite_fast(page, shmem_page_offset, page_length,
801 user_data, page_do_bit17_swizzling,
802 partial_cacheline_write,
803 needs_clflush_after);
808 mutex_unlock(&dev->struct_mutex);
809 ret = shmem_pwrite_slow(page, shmem_page_offset, page_length,
810 user_data, page_do_bit17_swizzling,
811 partial_cacheline_write,
812 needs_clflush_after);
814 mutex_lock(&dev->struct_mutex);
817 set_page_dirty(page);
818 mark_page_accessed(page);
823 remain -= page_length;
824 user_data += page_length;
825 offset += page_length;
829 i915_gem_object_unpin_pages(obj);
833 * Fixup: Flush cpu caches in case we didn't flush the dirty
834 * cachelines in-line while writing and the object moved
835 * out of the cpu write domain while we've dropped the lock.
837 if (!needs_clflush_after &&
838 obj->base.write_domain != I915_GEM_DOMAIN_CPU) {
839 if (i915_gem_clflush_object(obj, obj->pin_display))
840 i915_gem_chipset_flush(dev);
844 if (needs_clflush_after)
845 i915_gem_chipset_flush(dev);
851 * Writes data to the object referenced by handle.
853 * On error, the contents of the buffer that were to be modified are undefined.
856 i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
857 struct drm_file *file)
859 struct drm_i915_gem_pwrite *args = data;
860 struct drm_i915_gem_object *obj;
866 if (!access_ok(VERIFY_READ,
867 to_user_ptr(args->data_ptr),
871 if (likely(!i915_prefault_disable)) {
872 ret = fault_in_multipages_readable(to_user_ptr(args->data_ptr),
878 ret = i915_mutex_lock_interruptible(dev);
882 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
883 if (&obj->base == NULL) {
888 /* Bounds check destination. */
889 if (args->offset > obj->base.size ||
890 args->size > obj->base.size - args->offset) {
895 /* prime objects have no backing filp to GEM pread/pwrite
898 if (!obj->base.filp) {
903 trace_i915_gem_object_pwrite(obj, args->offset, args->size);
906 /* We can only do the GTT pwrite on untiled buffers, as otherwise
907 * it would end up going through the fenced access, and we'll get
908 * different detiling behavior between reading and writing.
909 * pread/pwrite currently are reading and writing from the CPU
910 * perspective, requiring manual detiling by the client.
913 ret = i915_gem_phys_pwrite(dev, obj, args, file);
917 if (obj->tiling_mode == I915_TILING_NONE &&
918 obj->base.write_domain != I915_GEM_DOMAIN_CPU &&
919 cpu_write_needs_clflush(obj)) {
920 ret = i915_gem_gtt_pwrite_fast(dev, obj, args, file);
921 /* Note that the gtt paths might fail with non-page-backed user
922 * pointers (e.g. gtt mappings when moving data between
923 * textures). Fallback to the shmem path in that case. */
926 if (ret == -EFAULT || ret == -ENOSPC)
927 ret = i915_gem_shmem_pwrite(dev, obj, args, file);
930 drm_gem_object_unreference(&obj->base);
932 mutex_unlock(&dev->struct_mutex);
937 i915_gem_check_wedge(struct i915_gpu_error *error,
940 if (i915_reset_in_progress(error)) {
941 /* Non-interruptible callers can't handle -EAGAIN, hence return
942 * -EIO unconditionally for these. */
946 /* Recovery complete, but the reset failed ... */
947 if (i915_terminally_wedged(error))
957 * Compare seqno against outstanding lazy request. Emit a request if they are
961 i915_gem_check_olr(struct intel_ring_buffer *ring, u32 seqno)
965 BUG_ON(!mutex_is_locked(&ring->dev->struct_mutex));
968 if (seqno == ring->outstanding_lazy_seqno)
969 ret = i915_add_request(ring, NULL);
974 static void fake_irq(unsigned long data)
976 wake_up_process((struct task_struct *)data);
979 static bool missed_irq(struct drm_i915_private *dev_priv,
980 struct intel_ring_buffer *ring)
982 return test_bit(ring->id, &dev_priv->gpu_error.missed_irq_rings);
985 static bool can_wait_boost(struct drm_i915_file_private *file_priv)
987 if (file_priv == NULL)
990 return !atomic_xchg(&file_priv->rps_wait_boost, true);
994 * __wait_seqno - wait until execution of seqno has finished
995 * @ring: the ring expected to report seqno
997 * @reset_counter: reset sequence associated with the given seqno
998 * @interruptible: do an interruptible wait (normally yes)
999 * @timeout: in - how long to wait (NULL forever); out - how much time remaining
1001 * Note: It is of utmost importance that the passed in seqno and reset_counter
1002 * values have been read by the caller in an smp safe manner. Where read-side
1003 * locks are involved, it is sufficient to read the reset_counter before
1004 * unlocking the lock that protects the seqno. For lockless tricks, the
1005 * reset_counter _must_ be read before, and an appropriate smp_rmb must be
1008 * Returns 0 if the seqno was found within the alloted time. Else returns the
1009 * errno with remaining time filled in timeout argument.
1011 static int __wait_seqno(struct intel_ring_buffer *ring, u32 seqno,
1012 unsigned reset_counter,
1014 struct timespec *timeout,
1015 struct drm_i915_file_private *file_priv)
1017 drm_i915_private_t *dev_priv = ring->dev->dev_private;
1018 const bool irq_test_in_progress =
1019 ACCESS_ONCE(dev_priv->gpu_error.test_irq_rings) & intel_ring_flag(ring);
1020 struct timespec before, now;
1022 unsigned long timeout_expire;
1025 WARN(dev_priv->pc8.irqs_disabled, "IRQs disabled\n");
1027 if (i915_seqno_passed(ring->get_seqno(ring, true), seqno))
1030 timeout_expire = timeout ? jiffies + timespec_to_jiffies_timeout(timeout) : 0;
1032 if (dev_priv->info->gen >= 6 && can_wait_boost(file_priv)) {
1033 gen6_rps_boost(dev_priv);
1035 mod_delayed_work(dev_priv->wq,
1036 &file_priv->mm.idle_work,
1037 msecs_to_jiffies(100));
1040 if (!irq_test_in_progress && WARN_ON(!ring->irq_get(ring)))
1043 /* Record current time in case interrupted by signal, or wedged */
1044 trace_i915_gem_request_wait_begin(ring, seqno);
1045 getrawmonotonic(&before);
1047 struct timer_list timer;
1049 prepare_to_wait(&ring->irq_queue, &wait,
1050 interruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
1052 /* We need to check whether any gpu reset happened in between
1053 * the caller grabbing the seqno and now ... */
1054 if (reset_counter != atomic_read(&dev_priv->gpu_error.reset_counter)) {
1055 /* ... but upgrade the -EAGAIN to an -EIO if the gpu
1056 * is truely gone. */
1057 ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
1063 if (i915_seqno_passed(ring->get_seqno(ring, false), seqno)) {
1068 if (interruptible && signal_pending(current)) {
1073 if (timeout && time_after_eq(jiffies, timeout_expire)) {
1078 timer.function = NULL;
1079 if (timeout || missed_irq(dev_priv, ring)) {
1080 unsigned long expire;
1082 setup_timer_on_stack(&timer, fake_irq, (unsigned long)current);
1083 expire = missed_irq(dev_priv, ring) ? jiffies + 1 : timeout_expire;
1084 mod_timer(&timer, expire);
1089 if (timer.function) {
1090 del_singleshot_timer_sync(&timer);
1091 destroy_timer_on_stack(&timer);
1094 getrawmonotonic(&now);
1095 trace_i915_gem_request_wait_end(ring, seqno);
1097 if (!irq_test_in_progress)
1098 ring->irq_put(ring);
1100 finish_wait(&ring->irq_queue, &wait);
1103 struct timespec sleep_time = timespec_sub(now, before);
1104 *timeout = timespec_sub(*timeout, sleep_time);
1105 if (!timespec_valid(timeout)) /* i.e. negative time remains */
1106 set_normalized_timespec(timeout, 0, 0);
1113 * Waits for a sequence number to be signaled, and cleans up the
1114 * request and object lists appropriately for that event.
1117 i915_wait_seqno(struct intel_ring_buffer *ring, uint32_t seqno)
1119 struct drm_device *dev = ring->dev;
1120 struct drm_i915_private *dev_priv = dev->dev_private;
1121 bool interruptible = dev_priv->mm.interruptible;
1124 BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1127 ret = i915_gem_check_wedge(&dev_priv->gpu_error, interruptible);
1131 ret = i915_gem_check_olr(ring, seqno);
1135 return __wait_seqno(ring, seqno,
1136 atomic_read(&dev_priv->gpu_error.reset_counter),
1137 interruptible, NULL, NULL);
1141 i915_gem_object_wait_rendering__tail(struct drm_i915_gem_object *obj,
1142 struct intel_ring_buffer *ring)
1144 i915_gem_retire_requests_ring(ring);
1146 /* Manually manage the write flush as we may have not yet
1147 * retired the buffer.
1149 * Note that the last_write_seqno is always the earlier of
1150 * the two (read/write) seqno, so if we haved successfully waited,
1151 * we know we have passed the last write.
1153 obj->last_write_seqno = 0;
1154 obj->base.write_domain &= ~I915_GEM_GPU_DOMAINS;
1160 * Ensures that all rendering to the object has completed and the object is
1161 * safe to unbind from the GTT or access from the CPU.
1163 static __must_check int
1164 i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj,
1167 struct intel_ring_buffer *ring = obj->ring;
1171 seqno = readonly ? obj->last_write_seqno : obj->last_read_seqno;
1175 ret = i915_wait_seqno(ring, seqno);
1179 return i915_gem_object_wait_rendering__tail(obj, ring);
1182 /* A nonblocking variant of the above wait. This is a highly dangerous routine
1183 * as the object state may change during this call.
1185 static __must_check int
1186 i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj,
1187 struct drm_file *file,
1190 struct drm_device *dev = obj->base.dev;
1191 struct drm_i915_private *dev_priv = dev->dev_private;
1192 struct intel_ring_buffer *ring = obj->ring;
1193 unsigned reset_counter;
1197 BUG_ON(!mutex_is_locked(&dev->struct_mutex));
1198 BUG_ON(!dev_priv->mm.interruptible);
1200 seqno = readonly ? obj->last_write_seqno : obj->last_read_seqno;
1204 ret = i915_gem_check_wedge(&dev_priv->gpu_error, true);
1208 ret = i915_gem_check_olr(ring, seqno);
1212 reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
1213 mutex_unlock(&dev->struct_mutex);
1214 ret = __wait_seqno(ring, seqno, reset_counter, true, NULL, file->driver_priv);
1215 mutex_lock(&dev->struct_mutex);
1219 return i915_gem_object_wait_rendering__tail(obj, ring);
1223 * Called when user space prepares to use an object with the CPU, either
1224 * through the mmap ioctl's mapping or a GTT mapping.
1227 i915_gem_set_domain_ioctl(struct drm_device *dev, void *data,
1228 struct drm_file *file)
1230 struct drm_i915_gem_set_domain *args = data;
1231 struct drm_i915_gem_object *obj;
1232 uint32_t read_domains = args->read_domains;
1233 uint32_t write_domain = args->write_domain;
1236 /* Only handle setting domains to types used by the CPU. */
1237 if (write_domain & I915_GEM_GPU_DOMAINS)
1240 if (read_domains & I915_GEM_GPU_DOMAINS)
1243 /* Having something in the write domain implies it's in the read
1244 * domain, and only that read domain. Enforce that in the request.
1246 if (write_domain != 0 && read_domains != write_domain)
1249 ret = i915_mutex_lock_interruptible(dev);
1253 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1254 if (&obj->base == NULL) {
1259 /* Try to flush the object off the GPU without holding the lock.
1260 * We will repeat the flush holding the lock in the normal manner
1261 * to catch cases where we are gazumped.
1263 ret = i915_gem_object_wait_rendering__nonblocking(obj, file, !write_domain);
1267 if (read_domains & I915_GEM_DOMAIN_GTT) {
1268 ret = i915_gem_object_set_to_gtt_domain(obj, write_domain != 0);
1270 /* Silently promote "you're not bound, there was nothing to do"
1271 * to success, since the client was just asking us to
1272 * make sure everything was done.
1277 ret = i915_gem_object_set_to_cpu_domain(obj, write_domain != 0);
1281 drm_gem_object_unreference(&obj->base);
1283 mutex_unlock(&dev->struct_mutex);
1288 * Called when user space has done writes to this buffer
1291 i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
1292 struct drm_file *file)
1294 struct drm_i915_gem_sw_finish *args = data;
1295 struct drm_i915_gem_object *obj;
1298 ret = i915_mutex_lock_interruptible(dev);
1302 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
1303 if (&obj->base == NULL) {
1308 /* Pinned buffers may be scanout, so flush the cache */
1309 if (obj->pin_display)
1310 i915_gem_object_flush_cpu_write_domain(obj, true);
1312 drm_gem_object_unreference(&obj->base);
1314 mutex_unlock(&dev->struct_mutex);
1319 * Maps the contents of an object, returning the address it is mapped
1322 * While the mapping holds a reference on the contents of the object, it doesn't
1323 * imply a ref on the object itself.
1326 i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
1327 struct drm_file *file)
1329 struct drm_i915_gem_mmap *args = data;
1330 struct drm_gem_object *obj;
1333 obj = drm_gem_object_lookup(dev, file, args->handle);
1337 /* prime objects have no backing filp to GEM mmap
1341 drm_gem_object_unreference_unlocked(obj);
1345 addr = vm_mmap(obj->filp, 0, args->size,
1346 PROT_READ | PROT_WRITE, MAP_SHARED,
1348 drm_gem_object_unreference_unlocked(obj);
1349 if (IS_ERR((void *)addr))
1352 args->addr_ptr = (uint64_t) addr;
1358 * i915_gem_fault - fault a page into the GTT
1359 * vma: VMA in question
1362 * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
1363 * from userspace. The fault handler takes care of binding the object to
1364 * the GTT (if needed), allocating and programming a fence register (again,
1365 * only if needed based on whether the old reg is still valid or the object
1366 * is tiled) and inserting a new PTE into the faulting process.
1368 * Note that the faulting process may involve evicting existing objects
1369 * from the GTT and/or fence registers to make room. So performance may
1370 * suffer if the GTT working set is large or there are few fence registers
1373 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1375 struct drm_i915_gem_object *obj = to_intel_bo(vma->vm_private_data);
1376 struct drm_device *dev = obj->base.dev;
1377 drm_i915_private_t *dev_priv = dev->dev_private;
1378 pgoff_t page_offset;
1381 bool write = !!(vmf->flags & FAULT_FLAG_WRITE);
1383 intel_runtime_pm_get(dev_priv);
1385 /* We don't use vmf->pgoff since that has the fake offset */
1386 page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
1389 ret = i915_mutex_lock_interruptible(dev);
1393 trace_i915_gem_object_fault(obj, page_offset, true, write);
1395 /* Access to snoopable pages through the GTT is incoherent. */
1396 if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev)) {
1401 /* Now bind it into the GTT if needed */
1402 ret = i915_gem_obj_ggtt_pin(obj, 0, true, false);
1406 ret = i915_gem_object_set_to_gtt_domain(obj, write);
1410 ret = i915_gem_object_get_fence(obj);
1414 obj->fault_mappable = true;
1416 pfn = dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj);
1420 /* Finally, remap it using the new GTT offset */
1421 ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
1423 i915_gem_object_ggtt_unpin(obj);
1425 mutex_unlock(&dev->struct_mutex);
1429 /* If this -EIO is due to a gpu hang, give the reset code a
1430 * chance to clean up the mess. Otherwise return the proper
1432 if (i915_terminally_wedged(&dev_priv->gpu_error)) {
1433 ret = VM_FAULT_SIGBUS;
1438 * EAGAIN means the gpu is hung and we'll wait for the error
1439 * handler to reset everything when re-faulting in
1440 * i915_mutex_lock_interruptible.
1447 * EBUSY is ok: this just means that another thread
1448 * already did the job.
1450 ret = VM_FAULT_NOPAGE;
1456 ret = VM_FAULT_SIGBUS;
1459 WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
1460 ret = VM_FAULT_SIGBUS;
1464 intel_runtime_pm_put(dev_priv);
1468 void i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv)
1470 struct i915_vma *vma;
1473 * Only the global gtt is relevant for gtt memory mappings, so restrict
1474 * list traversal to objects bound into the global address space. Note
1475 * that the active list should be empty, but better safe than sorry.
1477 WARN_ON(!list_empty(&dev_priv->gtt.base.active_list));
1478 list_for_each_entry(vma, &dev_priv->gtt.base.active_list, mm_list)
1479 i915_gem_release_mmap(vma->obj);
1480 list_for_each_entry(vma, &dev_priv->gtt.base.inactive_list, mm_list)
1481 i915_gem_release_mmap(vma->obj);
1485 * i915_gem_release_mmap - remove physical page mappings
1486 * @obj: obj in question
1488 * Preserve the reservation of the mmapping with the DRM core code, but
1489 * relinquish ownership of the pages back to the system.
1491 * It is vital that we remove the page mapping if we have mapped a tiled
1492 * object through the GTT and then lose the fence register due to
1493 * resource pressure. Similarly if the object has been moved out of the
1494 * aperture, than pages mapped into userspace must be revoked. Removing the
1495 * mapping will then trigger a page fault on the next user access, allowing
1496 * fixup by i915_gem_fault().
1499 i915_gem_release_mmap(struct drm_i915_gem_object *obj)
1501 if (!obj->fault_mappable)
1504 drm_vma_node_unmap(&obj->base.vma_node, obj->base.dev->dev_mapping);
1505 obj->fault_mappable = false;
1509 i915_gem_get_gtt_size(struct drm_device *dev, uint32_t size, int tiling_mode)
1513 if (INTEL_INFO(dev)->gen >= 4 ||
1514 tiling_mode == I915_TILING_NONE)
1517 /* Previous chips need a power-of-two fence region when tiling */
1518 if (INTEL_INFO(dev)->gen == 3)
1519 gtt_size = 1024*1024;
1521 gtt_size = 512*1024;
1523 while (gtt_size < size)
1530 * i915_gem_get_gtt_alignment - return required GTT alignment for an object
1531 * @obj: object to check
1533 * Return the required GTT alignment for an object, taking into account
1534 * potential fence register mapping.
1537 i915_gem_get_gtt_alignment(struct drm_device *dev, uint32_t size,
1538 int tiling_mode, bool fenced)
1541 * Minimum alignment is 4k (GTT page size), but might be greater
1542 * if a fence register is needed for the object.
1544 if (INTEL_INFO(dev)->gen >= 4 || (!fenced && IS_G33(dev)) ||
1545 tiling_mode == I915_TILING_NONE)
1549 * Previous chips need to be aligned to the size of the smallest
1550 * fence register that can contain the object.
1552 return i915_gem_get_gtt_size(dev, size, tiling_mode);
1555 static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
1557 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
1560 if (drm_vma_node_has_offset(&obj->base.vma_node))
1563 dev_priv->mm.shrinker_no_lock_stealing = true;
1565 ret = drm_gem_create_mmap_offset(&obj->base);
1569 /* Badly fragmented mmap space? The only way we can recover
1570 * space is by destroying unwanted objects. We can't randomly release
1571 * mmap_offsets as userspace expects them to be persistent for the
1572 * lifetime of the objects. The closest we can is to release the
1573 * offsets on purgeable objects by truncating it and marking it purged,
1574 * which prevents userspace from ever using that object again.
1576 i915_gem_purge(dev_priv, obj->base.size >> PAGE_SHIFT);
1577 ret = drm_gem_create_mmap_offset(&obj->base);
1581 i915_gem_shrink_all(dev_priv);
1582 ret = drm_gem_create_mmap_offset(&obj->base);
1584 dev_priv->mm.shrinker_no_lock_stealing = false;
1589 static void i915_gem_object_free_mmap_offset(struct drm_i915_gem_object *obj)
1591 drm_gem_free_mmap_offset(&obj->base);
1595 i915_gem_mmap_gtt(struct drm_file *file,
1596 struct drm_device *dev,
1600 struct drm_i915_private *dev_priv = dev->dev_private;
1601 struct drm_i915_gem_object *obj;
1604 ret = i915_mutex_lock_interruptible(dev);
1608 obj = to_intel_bo(drm_gem_object_lookup(dev, file, handle));
1609 if (&obj->base == NULL) {
1614 if (obj->base.size > dev_priv->gtt.mappable_end) {
1619 if (obj->madv != I915_MADV_WILLNEED) {
1620 DRM_ERROR("Attempting to mmap a purgeable buffer\n");
1625 ret = i915_gem_object_create_mmap_offset(obj);
1629 *offset = drm_vma_node_offset_addr(&obj->base.vma_node);
1632 drm_gem_object_unreference(&obj->base);
1634 mutex_unlock(&dev->struct_mutex);
1639 * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
1641 * @data: GTT mapping ioctl data
1642 * @file: GEM object info
1644 * Simply returns the fake offset to userspace so it can mmap it.
1645 * The mmap call will end up in drm_gem_mmap(), which will set things
1646 * up so we can get faults in the handler above.
1648 * The fault handler will take care of binding the object into the GTT
1649 * (since it may have been evicted to make room for something), allocating
1650 * a fence register, and mapping the appropriate aperture address into
1654 i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
1655 struct drm_file *file)
1657 struct drm_i915_gem_mmap_gtt *args = data;
1659 return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
1662 /* Immediately discard the backing storage */
1664 i915_gem_object_truncate(struct drm_i915_gem_object *obj)
1666 struct inode *inode;
1668 i915_gem_object_free_mmap_offset(obj);
1670 if (obj->base.filp == NULL)
1673 /* Our goal here is to return as much of the memory as
1674 * is possible back to the system as we are called from OOM.
1675 * To do this we must instruct the shmfs to drop all of its
1676 * backing pages, *now*.
1678 inode = file_inode(obj->base.filp);
1679 shmem_truncate_range(inode, 0, (loff_t)-1);
1681 obj->madv = __I915_MADV_PURGED;
1685 i915_gem_object_is_purgeable(struct drm_i915_gem_object *obj)
1687 return obj->madv == I915_MADV_DONTNEED;
1691 i915_gem_object_put_pages_gtt(struct drm_i915_gem_object *obj)
1693 struct sg_page_iter sg_iter;
1696 BUG_ON(obj->madv == __I915_MADV_PURGED);
1698 ret = i915_gem_object_set_to_cpu_domain(obj, true);
1700 /* In the event of a disaster, abandon all caches and
1701 * hope for the best.
1703 WARN_ON(ret != -EIO);
1704 i915_gem_clflush_object(obj, true);
1705 obj->base.read_domains = obj->base.write_domain = I915_GEM_DOMAIN_CPU;
1708 if (i915_gem_object_needs_bit17_swizzle(obj))
1709 i915_gem_object_save_bit_17_swizzle(obj);
1711 if (obj->madv == I915_MADV_DONTNEED)
1714 for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0) {
1715 struct page *page = sg_page_iter_page(&sg_iter);
1718 set_page_dirty(page);
1720 if (obj->madv == I915_MADV_WILLNEED)
1721 mark_page_accessed(page);
1723 page_cache_release(page);
1727 sg_free_table(obj->pages);
1732 i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
1734 const struct drm_i915_gem_object_ops *ops = obj->ops;
1736 if (obj->pages == NULL)
1739 if (obj->pages_pin_count)
1742 BUG_ON(i915_gem_obj_bound_any(obj));
1744 /* ->put_pages might need to allocate memory for the bit17 swizzle
1745 * array, hence protect them from being reaped by removing them from gtt
1747 list_del(&obj->global_list);
1749 ops->put_pages(obj);
1752 if (i915_gem_object_is_purgeable(obj))
1753 i915_gem_object_truncate(obj);
1758 static unsigned long
1759 __i915_gem_shrink(struct drm_i915_private *dev_priv, long target,
1760 bool purgeable_only)
1762 struct list_head still_bound_list;
1763 struct drm_i915_gem_object *obj, *next;
1764 unsigned long count = 0;
1766 list_for_each_entry_safe(obj, next,
1767 &dev_priv->mm.unbound_list,
1769 if ((i915_gem_object_is_purgeable(obj) || !purgeable_only) &&
1770 i915_gem_object_put_pages(obj) == 0) {
1771 count += obj->base.size >> PAGE_SHIFT;
1772 if (count >= target)
1778 * As we may completely rewrite the bound list whilst unbinding
1779 * (due to retiring requests) we have to strictly process only
1780 * one element of the list at the time, and recheck the list
1781 * on every iteration.
1783 INIT_LIST_HEAD(&still_bound_list);
1784 while (count < target && !list_empty(&dev_priv->mm.bound_list)) {
1785 struct i915_vma *vma, *v;
1787 obj = list_first_entry(&dev_priv->mm.bound_list,
1788 typeof(*obj), global_list);
1789 list_move_tail(&obj->global_list, &still_bound_list);
1791 if (!i915_gem_object_is_purgeable(obj) && purgeable_only)
1795 * Hold a reference whilst we unbind this object, as we may
1796 * end up waiting for and retiring requests. This might
1797 * release the final reference (held by the active list)
1798 * and result in the object being freed from under us.
1799 * in this object being freed.
1801 * Note 1: Shrinking the bound list is special since only active
1802 * (and hence bound objects) can contain such limbo objects, so
1803 * we don't need special tricks for shrinking the unbound list.
1804 * The only other place where we have to be careful with active
1805 * objects suddenly disappearing due to retiring requests is the
1808 * Note 2: Even though the bound list doesn't hold a reference
1809 * to the object we can safely grab one here: The final object
1810 * unreferencing and the bound_list are both protected by the
1811 * dev->struct_mutex and so we won't ever be able to observe an
1812 * object on the bound_list with a reference count equals 0.
1814 drm_gem_object_reference(&obj->base);
1816 list_for_each_entry_safe(vma, v, &obj->vma_list, vma_link)
1817 if (i915_vma_unbind(vma))
1820 if (i915_gem_object_put_pages(obj) == 0)
1821 count += obj->base.size >> PAGE_SHIFT;
1823 drm_gem_object_unreference(&obj->base);
1825 list_splice(&still_bound_list, &dev_priv->mm.bound_list);
1830 static unsigned long
1831 i915_gem_purge(struct drm_i915_private *dev_priv, long target)
1833 return __i915_gem_shrink(dev_priv, target, true);
1836 static unsigned long
1837 i915_gem_shrink_all(struct drm_i915_private *dev_priv)
1839 struct drm_i915_gem_object *obj, *next;
1842 i915_gem_evict_everything(dev_priv->dev);
1844 list_for_each_entry_safe(obj, next, &dev_priv->mm.unbound_list,
1846 if (i915_gem_object_put_pages(obj) == 0)
1847 freed += obj->base.size >> PAGE_SHIFT;
1853 i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
1855 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
1857 struct address_space *mapping;
1858 struct sg_table *st;
1859 struct scatterlist *sg;
1860 struct sg_page_iter sg_iter;
1862 unsigned long last_pfn = 0; /* suppress gcc warning */
1865 /* Assert that the object is not currently in any GPU domain. As it
1866 * wasn't in the GTT, there shouldn't be any way it could have been in
1869 BUG_ON(obj->base.read_domains & I915_GEM_GPU_DOMAINS);
1870 BUG_ON(obj->base.write_domain & I915_GEM_GPU_DOMAINS);
1872 st = kmalloc(sizeof(*st), GFP_KERNEL);
1876 page_count = obj->base.size / PAGE_SIZE;
1877 if (sg_alloc_table(st, page_count, GFP_KERNEL)) {
1882 /* Get the list of pages out of our struct file. They'll be pinned
1883 * at this point until we release them.
1885 * Fail silently without starting the shrinker
1887 mapping = file_inode(obj->base.filp)->i_mapping;
1888 gfp = mapping_gfp_mask(mapping);
1889 gfp |= __GFP_NORETRY | __GFP_NOWARN | __GFP_NO_KSWAPD;
1890 gfp &= ~(__GFP_IO | __GFP_WAIT);
1893 for (i = 0; i < page_count; i++) {
1894 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
1896 i915_gem_purge(dev_priv, page_count);
1897 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
1900 /* We've tried hard to allocate the memory by reaping
1901 * our own buffer, now let the real VM do its job and
1902 * go down in flames if truly OOM.
1904 gfp &= ~(__GFP_NORETRY | __GFP_NOWARN | __GFP_NO_KSWAPD);
1905 gfp |= __GFP_IO | __GFP_WAIT;
1907 i915_gem_shrink_all(dev_priv);
1908 page = shmem_read_mapping_page_gfp(mapping, i, gfp);
1912 gfp |= __GFP_NORETRY | __GFP_NOWARN | __GFP_NO_KSWAPD;
1913 gfp &= ~(__GFP_IO | __GFP_WAIT);
1915 #ifdef CONFIG_SWIOTLB
1916 if (swiotlb_nr_tbl()) {
1918 sg_set_page(sg, page, PAGE_SIZE, 0);
1923 if (!i || page_to_pfn(page) != last_pfn + 1) {
1927 sg_set_page(sg, page, PAGE_SIZE, 0);
1929 sg->length += PAGE_SIZE;
1931 last_pfn = page_to_pfn(page);
1933 /* Check that the i965g/gm workaround works. */
1934 WARN_ON((gfp & __GFP_DMA32) && (last_pfn >= 0x00100000UL));
1936 #ifdef CONFIG_SWIOTLB
1937 if (!swiotlb_nr_tbl())
1942 if (i915_gem_object_needs_bit17_swizzle(obj))
1943 i915_gem_object_do_bit_17_swizzle(obj);
1949 for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
1950 page_cache_release(sg_page_iter_page(&sg_iter));
1953 return PTR_ERR(page);
1956 /* Ensure that the associated pages are gathered from the backing storage
1957 * and pinned into our object. i915_gem_object_get_pages() may be called
1958 * multiple times before they are released by a single call to
1959 * i915_gem_object_put_pages() - once the pages are no longer referenced
1960 * either as a result of memory pressure (reaping pages under the shrinker)
1961 * or as the object is itself released.
1964 i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
1966 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
1967 const struct drm_i915_gem_object_ops *ops = obj->ops;
1973 if (obj->madv != I915_MADV_WILLNEED) {
1974 DRM_ERROR("Attempting to obtain a purgeable object\n");
1978 BUG_ON(obj->pages_pin_count);
1980 ret = ops->get_pages(obj);
1984 list_add_tail(&obj->global_list, &dev_priv->mm.unbound_list);
1989 i915_gem_object_move_to_active(struct drm_i915_gem_object *obj,
1990 struct intel_ring_buffer *ring)
1992 struct drm_device *dev = obj->base.dev;
1993 struct drm_i915_private *dev_priv = dev->dev_private;
1994 u32 seqno = intel_ring_get_seqno(ring);
1996 BUG_ON(ring == NULL);
1997 if (obj->ring != ring && obj->last_write_seqno) {
1998 /* Keep the seqno relative to the current ring */
1999 obj->last_write_seqno = seqno;
2003 /* Add a reference if we're newly entering the active list. */
2005 drm_gem_object_reference(&obj->base);
2009 list_move_tail(&obj->ring_list, &ring->active_list);
2011 obj->last_read_seqno = seqno;
2013 if (obj->fenced_gpu_access) {
2014 obj->last_fenced_seqno = seqno;
2016 /* Bump MRU to take account of the delayed flush */
2017 if (obj->fence_reg != I915_FENCE_REG_NONE) {
2018 struct drm_i915_fence_reg *reg;
2020 reg = &dev_priv->fence_regs[obj->fence_reg];
2021 list_move_tail(®->lru_list,
2022 &dev_priv->mm.fence_list);
2027 void i915_vma_move_to_active(struct i915_vma *vma,
2028 struct intel_ring_buffer *ring)
2030 list_move_tail(&vma->mm_list, &vma->vm->active_list);
2031 return i915_gem_object_move_to_active(vma->obj, ring);
2035 i915_gem_object_move_to_inactive(struct drm_i915_gem_object *obj)
2037 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2038 struct i915_address_space *vm;
2039 struct i915_vma *vma;
2041 BUG_ON(obj->base.write_domain & ~I915_GEM_GPU_DOMAINS);
2042 BUG_ON(!obj->active);
2044 list_for_each_entry(vm, &dev_priv->vm_list, global_link) {
2045 vma = i915_gem_obj_to_vma(obj, vm);
2046 if (vma && !list_empty(&vma->mm_list))
2047 list_move_tail(&vma->mm_list, &vm->inactive_list);
2050 list_del_init(&obj->ring_list);
2053 obj->last_read_seqno = 0;
2054 obj->last_write_seqno = 0;
2055 obj->base.write_domain = 0;
2057 obj->last_fenced_seqno = 0;
2058 obj->fenced_gpu_access = false;
2061 drm_gem_object_unreference(&obj->base);
2063 WARN_ON(i915_verify_lists(dev));
2067 i915_gem_init_seqno(struct drm_device *dev, u32 seqno)
2069 struct drm_i915_private *dev_priv = dev->dev_private;
2070 struct intel_ring_buffer *ring;
2073 /* Carefully retire all requests without writing to the rings */
2074 for_each_ring(ring, dev_priv, i) {
2075 ret = intel_ring_idle(ring);
2079 i915_gem_retire_requests(dev);
2081 /* Finally reset hw state */
2082 for_each_ring(ring, dev_priv, i) {
2083 intel_ring_init_seqno(ring, seqno);
2085 for (j = 0; j < ARRAY_SIZE(ring->sync_seqno); j++)
2086 ring->sync_seqno[j] = 0;
2092 int i915_gem_set_seqno(struct drm_device *dev, u32 seqno)
2094 struct drm_i915_private *dev_priv = dev->dev_private;
2100 /* HWS page needs to be set less than what we
2101 * will inject to ring
2103 ret = i915_gem_init_seqno(dev, seqno - 1);
2107 /* Carefully set the last_seqno value so that wrap
2108 * detection still works
2110 dev_priv->next_seqno = seqno;
2111 dev_priv->last_seqno = seqno - 1;
2112 if (dev_priv->last_seqno == 0)
2113 dev_priv->last_seqno--;
2119 i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
2121 struct drm_i915_private *dev_priv = dev->dev_private;
2123 /* reserve 0 for non-seqno */
2124 if (dev_priv->next_seqno == 0) {
2125 int ret = i915_gem_init_seqno(dev, 0);
2129 dev_priv->next_seqno = 1;
2132 *seqno = dev_priv->last_seqno = dev_priv->next_seqno++;
2136 int __i915_add_request(struct intel_ring_buffer *ring,
2137 struct drm_file *file,
2138 struct drm_i915_gem_object *obj,
2141 drm_i915_private_t *dev_priv = ring->dev->dev_private;
2142 struct drm_i915_gem_request *request;
2143 u32 request_ring_position, request_start;
2147 request_start = intel_ring_get_tail(ring);
2149 * Emit any outstanding flushes - execbuf can fail to emit the flush
2150 * after having emitted the batchbuffer command. Hence we need to fix
2151 * things up similar to emitting the lazy request. The difference here
2152 * is that the flush _must_ happen before the next request, no matter
2155 ret = intel_ring_flush_all_caches(ring);
2159 request = ring->preallocated_lazy_request;
2160 if (WARN_ON(request == NULL))
2163 /* Record the position of the start of the request so that
2164 * should we detect the updated seqno part-way through the
2165 * GPU processing the request, we never over-estimate the
2166 * position of the head.
2168 request_ring_position = intel_ring_get_tail(ring);
2170 ret = ring->add_request(ring);
2174 request->seqno = intel_ring_get_seqno(ring);
2175 request->ring = ring;
2176 request->head = request_start;
2177 request->tail = request_ring_position;
2179 /* Whilst this request exists, batch_obj will be on the
2180 * active_list, and so will hold the active reference. Only when this
2181 * request is retired will the the batch_obj be moved onto the
2182 * inactive_list and lose its active reference. Hence we do not need
2183 * to explicitly hold another reference here.
2185 request->batch_obj = obj;
2187 /* Hold a reference to the current context so that we can inspect
2188 * it later in case a hangcheck error event fires.
2190 request->ctx = ring->last_context;
2192 i915_gem_context_reference(request->ctx);
2194 request->emitted_jiffies = jiffies;
2195 was_empty = list_empty(&ring->request_list);
2196 list_add_tail(&request->list, &ring->request_list);
2197 request->file_priv = NULL;
2200 struct drm_i915_file_private *file_priv = file->driver_priv;
2202 spin_lock(&file_priv->mm.lock);
2203 request->file_priv = file_priv;
2204 list_add_tail(&request->client_list,
2205 &file_priv->mm.request_list);
2206 spin_unlock(&file_priv->mm.lock);
2209 trace_i915_gem_request_add(ring, request->seqno);
2210 ring->outstanding_lazy_seqno = 0;
2211 ring->preallocated_lazy_request = NULL;
2213 if (!dev_priv->ums.mm_suspended) {
2214 i915_queue_hangcheck(ring->dev);
2217 cancel_delayed_work_sync(&dev_priv->mm.idle_work);
2218 queue_delayed_work(dev_priv->wq,
2219 &dev_priv->mm.retire_work,
2220 round_jiffies_up_relative(HZ));
2221 intel_mark_busy(dev_priv->dev);
2226 *out_seqno = request->seqno;
2231 i915_gem_request_remove_from_client(struct drm_i915_gem_request *request)
2233 struct drm_i915_file_private *file_priv = request->file_priv;
2238 spin_lock(&file_priv->mm.lock);
2239 list_del(&request->client_list);
2240 request->file_priv = NULL;
2241 spin_unlock(&file_priv->mm.lock);
2244 static bool i915_head_inside_object(u32 acthd, struct drm_i915_gem_object *obj,
2245 struct i915_address_space *vm)
2247 if (acthd >= i915_gem_obj_offset(obj, vm) &&
2248 acthd < i915_gem_obj_offset(obj, vm) + obj->base.size)
2254 static bool i915_head_inside_request(const u32 acthd_unmasked,
2255 const u32 request_start,
2256 const u32 request_end)
2258 const u32 acthd = acthd_unmasked & HEAD_ADDR;
2260 if (request_start < request_end) {
2261 if (acthd >= request_start && acthd < request_end)
2263 } else if (request_start > request_end) {
2264 if (acthd >= request_start || acthd < request_end)
2271 static struct i915_address_space *
2272 request_to_vm(struct drm_i915_gem_request *request)
2274 struct drm_i915_private *dev_priv = request->ring->dev->dev_private;
2275 struct i915_address_space *vm;
2278 vm = request->ctx->vm;
2280 vm = &dev_priv->gtt.base;
2285 static bool i915_request_guilty(struct drm_i915_gem_request *request,
2286 const u32 acthd, bool *inside)
2288 /* There is a possibility that unmasked head address
2289 * pointing inside the ring, matches the batch_obj address range.
2290 * However this is extremely unlikely.
2292 if (request->batch_obj) {
2293 if (i915_head_inside_object(acthd, request->batch_obj,
2294 request_to_vm(request))) {
2300 if (i915_head_inside_request(acthd, request->head, request->tail)) {
2308 static bool i915_context_is_banned(const struct i915_ctx_hang_stats *hs)
2310 const unsigned long elapsed = get_seconds() - hs->guilty_ts;
2315 if (elapsed <= DRM_I915_CTX_BAN_PERIOD) {
2316 DRM_ERROR("context hanging too fast, declaring banned!\n");
2323 static void i915_set_reset_status(struct intel_ring_buffer *ring,
2324 struct drm_i915_gem_request *request,
2327 struct i915_ctx_hang_stats *hs = NULL;
2328 bool inside, guilty;
2329 unsigned long offset = 0;
2331 /* Innocent until proven guilty */
2334 if (request->batch_obj)
2335 offset = i915_gem_obj_offset(request->batch_obj,
2336 request_to_vm(request));
2338 if (ring->hangcheck.action != HANGCHECK_WAIT &&
2339 i915_request_guilty(request, acthd, &inside)) {
2340 DRM_DEBUG("%s hung %s bo (0x%lx ctx %d) at 0x%x\n",
2342 inside ? "inside" : "flushing",
2344 request->ctx ? request->ctx->id : 0,
2350 /* If contexts are disabled or this is the default context, use
2351 * file_priv->reset_state
2353 if (request->ctx && request->ctx->id != DEFAULT_CONTEXT_ID)
2354 hs = &request->ctx->hang_stats;
2355 else if (request->file_priv)
2356 hs = &request->file_priv->private_default_ctx->hang_stats;
2360 hs->banned = i915_context_is_banned(hs);
2362 hs->guilty_ts = get_seconds();
2364 hs->batch_pending++;
2369 static void i915_gem_free_request(struct drm_i915_gem_request *request)
2371 list_del(&request->list);
2372 i915_gem_request_remove_from_client(request);
2375 i915_gem_context_unreference(request->ctx);
2380 static void i915_gem_reset_ring_status(struct drm_i915_private *dev_priv,
2381 struct intel_ring_buffer *ring)
2383 u32 completed_seqno = ring->get_seqno(ring, false);
2384 u32 acthd = intel_ring_get_active_head(ring);
2385 struct drm_i915_gem_request *request;
2387 list_for_each_entry(request, &ring->request_list, list) {
2388 if (i915_seqno_passed(completed_seqno, request->seqno))
2391 i915_set_reset_status(ring, request, acthd);
2395 static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
2396 struct intel_ring_buffer *ring)
2398 while (!list_empty(&ring->active_list)) {
2399 struct drm_i915_gem_object *obj;
2401 obj = list_first_entry(&ring->active_list,
2402 struct drm_i915_gem_object,
2405 i915_gem_object_move_to_inactive(obj);
2409 * We must free the requests after all the corresponding objects have
2410 * been moved off active lists. Which is the same order as the normal
2411 * retire_requests function does. This is important if object hold
2412 * implicit references on things like e.g. ppgtt address spaces through
2415 while (!list_empty(&ring->request_list)) {
2416 struct drm_i915_gem_request *request;
2418 request = list_first_entry(&ring->request_list,
2419 struct drm_i915_gem_request,
2422 i915_gem_free_request(request);
2426 void i915_gem_restore_fences(struct drm_device *dev)
2428 struct drm_i915_private *dev_priv = dev->dev_private;
2431 for (i = 0; i < dev_priv->num_fence_regs; i++) {
2432 struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
2435 * Commit delayed tiling changes if we have an object still
2436 * attached to the fence, otherwise just clear the fence.
2439 i915_gem_object_update_fence(reg->obj, reg,
2440 reg->obj->tiling_mode);
2442 i915_gem_write_fence(dev, i, NULL);
2447 void i915_gem_reset(struct drm_device *dev)
2449 struct drm_i915_private *dev_priv = dev->dev_private;
2450 struct intel_ring_buffer *ring;
2454 * Before we free the objects from the requests, we need to inspect
2455 * them for finding the guilty party. As the requests only borrow
2456 * their reference to the objects, the inspection must be done first.
2458 for_each_ring(ring, dev_priv, i)
2459 i915_gem_reset_ring_status(dev_priv, ring);
2461 for_each_ring(ring, dev_priv, i)
2462 i915_gem_reset_ring_cleanup(dev_priv, ring);
2464 i915_gem_cleanup_ringbuffer(dev);
2466 i915_gem_context_reset(dev);
2468 i915_gem_restore_fences(dev);
2472 * This function clears the request list as sequence numbers are passed.
2475 i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
2479 if (list_empty(&ring->request_list))
2482 WARN_ON(i915_verify_lists(ring->dev));
2484 seqno = ring->get_seqno(ring, true);
2486 /* Move any buffers on the active list that are no longer referenced
2487 * by the ringbuffer to the flushing/inactive lists as appropriate,
2488 * before we free the context associated with the requests.
2490 while (!list_empty(&ring->active_list)) {
2491 struct drm_i915_gem_object *obj;
2493 obj = list_first_entry(&ring->active_list,
2494 struct drm_i915_gem_object,
2497 if (!i915_seqno_passed(seqno, obj->last_read_seqno))
2500 i915_gem_object_move_to_inactive(obj);
2504 while (!list_empty(&ring->request_list)) {
2505 struct drm_i915_gem_request *request;
2507 request = list_first_entry(&ring->request_list,
2508 struct drm_i915_gem_request,
2511 if (!i915_seqno_passed(seqno, request->seqno))
2514 trace_i915_gem_request_retire(ring, request->seqno);
2515 /* We know the GPU must have read the request to have
2516 * sent us the seqno + interrupt, so use the position
2517 * of tail of the request to update the last known position
2520 ring->last_retired_head = request->tail;
2522 i915_gem_free_request(request);
2525 if (unlikely(ring->trace_irq_seqno &&
2526 i915_seqno_passed(seqno, ring->trace_irq_seqno))) {
2527 ring->irq_put(ring);
2528 ring->trace_irq_seqno = 0;
2531 WARN_ON(i915_verify_lists(ring->dev));
2535 i915_gem_retire_requests(struct drm_device *dev)
2537 drm_i915_private_t *dev_priv = dev->dev_private;
2538 struct intel_ring_buffer *ring;
2542 for_each_ring(ring, dev_priv, i) {
2543 i915_gem_retire_requests_ring(ring);
2544 idle &= list_empty(&ring->request_list);
2548 mod_delayed_work(dev_priv->wq,
2549 &dev_priv->mm.idle_work,
2550 msecs_to_jiffies(100));
2556 i915_gem_retire_work_handler(struct work_struct *work)
2558 struct drm_i915_private *dev_priv =
2559 container_of(work, typeof(*dev_priv), mm.retire_work.work);
2560 struct drm_device *dev = dev_priv->dev;
2563 /* Come back later if the device is busy... */
2565 if (mutex_trylock(&dev->struct_mutex)) {
2566 idle = i915_gem_retire_requests(dev);
2567 mutex_unlock(&dev->struct_mutex);
2570 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work,
2571 round_jiffies_up_relative(HZ));
2575 i915_gem_idle_work_handler(struct work_struct *work)
2577 struct drm_i915_private *dev_priv =
2578 container_of(work, typeof(*dev_priv), mm.idle_work.work);
2580 intel_mark_idle(dev_priv->dev);
2584 * Ensures that an object will eventually get non-busy by flushing any required
2585 * write domains, emitting any outstanding lazy request and retiring and
2586 * completed requests.
2589 i915_gem_object_flush_active(struct drm_i915_gem_object *obj)
2594 ret = i915_gem_check_olr(obj->ring, obj->last_read_seqno);
2598 i915_gem_retire_requests_ring(obj->ring);
2605 * i915_gem_wait_ioctl - implements DRM_IOCTL_I915_GEM_WAIT
2606 * @DRM_IOCTL_ARGS: standard ioctl arguments
2608 * Returns 0 if successful, else an error is returned with the remaining time in
2609 * the timeout parameter.
2610 * -ETIME: object is still busy after timeout
2611 * -ERESTARTSYS: signal interrupted the wait
2612 * -ENONENT: object doesn't exist
2613 * Also possible, but rare:
2614 * -EAGAIN: GPU wedged
2616 * -ENODEV: Internal IRQ fail
2617 * -E?: The add request failed
2619 * The wait ioctl with a timeout of 0 reimplements the busy ioctl. With any
2620 * non-zero timeout parameter the wait ioctl will wait for the given number of
2621 * nanoseconds on an object becoming unbusy. Since the wait itself does so
2622 * without holding struct_mutex the object may become re-busied before this
2623 * function completes. A similar but shorter * race condition exists in the busy
2627 i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
2629 drm_i915_private_t *dev_priv = dev->dev_private;
2630 struct drm_i915_gem_wait *args = data;
2631 struct drm_i915_gem_object *obj;
2632 struct intel_ring_buffer *ring = NULL;
2633 struct timespec timeout_stack, *timeout = NULL;
2634 unsigned reset_counter;
2638 if (args->timeout_ns >= 0) {
2639 timeout_stack = ns_to_timespec(args->timeout_ns);
2640 timeout = &timeout_stack;
2643 ret = i915_mutex_lock_interruptible(dev);
2647 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->bo_handle));
2648 if (&obj->base == NULL) {
2649 mutex_unlock(&dev->struct_mutex);
2653 /* Need to make sure the object gets inactive eventually. */
2654 ret = i915_gem_object_flush_active(obj);
2659 seqno = obj->last_read_seqno;
2666 /* Do this after OLR check to make sure we make forward progress polling
2667 * on this IOCTL with a 0 timeout (like busy ioctl)
2669 if (!args->timeout_ns) {
2674 drm_gem_object_unreference(&obj->base);
2675 reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
2676 mutex_unlock(&dev->struct_mutex);
2678 ret = __wait_seqno(ring, seqno, reset_counter, true, timeout, file->driver_priv);
2680 args->timeout_ns = timespec_to_ns(timeout);
2684 drm_gem_object_unreference(&obj->base);
2685 mutex_unlock(&dev->struct_mutex);
2690 * i915_gem_object_sync - sync an object to a ring.
2692 * @obj: object which may be in use on another ring.
2693 * @to: ring we wish to use the object on. May be NULL.
2695 * This code is meant to abstract object synchronization with the GPU.
2696 * Calling with NULL implies synchronizing the object with the CPU
2697 * rather than a particular GPU ring.
2699 * Returns 0 if successful, else propagates up the lower layer error.
2702 i915_gem_object_sync(struct drm_i915_gem_object *obj,
2703 struct intel_ring_buffer *to)
2705 struct intel_ring_buffer *from = obj->ring;
2709 if (from == NULL || to == from)
2712 if (to == NULL || !i915_semaphore_is_enabled(obj->base.dev))
2713 return i915_gem_object_wait_rendering(obj, false);
2715 idx = intel_ring_sync_index(from, to);
2717 seqno = obj->last_read_seqno;
2718 if (seqno <= from->sync_seqno[idx])
2721 ret = i915_gem_check_olr(obj->ring, seqno);
2725 trace_i915_gem_ring_sync_to(from, to, seqno);
2726 ret = to->sync_to(to, from, seqno);
2728 /* We use last_read_seqno because sync_to()
2729 * might have just caused seqno wrap under
2732 from->sync_seqno[idx] = obj->last_read_seqno;
2737 static void i915_gem_object_finish_gtt(struct drm_i915_gem_object *obj)
2739 u32 old_write_domain, old_read_domains;
2741 /* Force a pagefault for domain tracking on next user access */
2742 i915_gem_release_mmap(obj);
2744 if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
2747 /* Wait for any direct GTT access to complete */
2750 old_read_domains = obj->base.read_domains;
2751 old_write_domain = obj->base.write_domain;
2753 obj->base.read_domains &= ~I915_GEM_DOMAIN_GTT;
2754 obj->base.write_domain &= ~I915_GEM_DOMAIN_GTT;
2756 trace_i915_gem_object_change_domain(obj,
2761 int i915_vma_unbind(struct i915_vma *vma)
2763 struct drm_i915_gem_object *obj = vma->obj;
2764 drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
2767 if (list_empty(&vma->vma_link))
2770 if (!drm_mm_node_allocated(&vma->node)) {
2771 i915_gem_vma_destroy(vma);
2779 BUG_ON(obj->pages == NULL);
2781 ret = i915_gem_object_finish_gpu(obj);
2784 /* Continue on if we fail due to EIO, the GPU is hung so we
2785 * should be safe and we need to cleanup or else we might
2786 * cause memory corruption through use-after-free.
2789 i915_gem_object_finish_gtt(obj);
2791 /* release the fence reg _after_ flushing */
2792 ret = i915_gem_object_put_fence(obj);
2796 trace_i915_vma_unbind(vma);
2798 vma->unbind_vma(vma);
2800 i915_gem_gtt_finish_object(obj);
2802 list_del(&vma->mm_list);
2803 /* Avoid an unnecessary call to unbind on rebind. */
2804 if (i915_is_ggtt(vma->vm))
2805 obj->map_and_fenceable = true;
2807 drm_mm_remove_node(&vma->node);
2808 i915_gem_vma_destroy(vma);
2810 /* Since the unbound list is global, only move to that list if
2811 * no more VMAs exist. */
2812 if (list_empty(&obj->vma_list))
2813 list_move_tail(&obj->global_list, &dev_priv->mm.unbound_list);
2815 /* And finally now the object is completely decoupled from this vma,
2816 * we can drop its hold on the backing storage and allow it to be
2817 * reaped by the shrinker.
2819 i915_gem_object_unpin_pages(obj);
2825 * Unbinds an object from the global GTT aperture.
2828 i915_gem_object_ggtt_unbind(struct drm_i915_gem_object *obj)
2830 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
2831 struct i915_address_space *ggtt = &dev_priv->gtt.base;
2833 if (!i915_gem_obj_ggtt_bound(obj))
2836 if (i915_gem_obj_to_ggtt(obj)->pin_count)
2839 BUG_ON(obj->pages == NULL);
2841 return i915_vma_unbind(i915_gem_obj_to_vma(obj, ggtt));
2844 int i915_gpu_idle(struct drm_device *dev)
2846 drm_i915_private_t *dev_priv = dev->dev_private;
2847 struct intel_ring_buffer *ring;
2850 /* Flush everything onto the inactive list. */
2851 for_each_ring(ring, dev_priv, i) {
2852 ret = i915_switch_context(ring, NULL, ring->default_context);
2856 ret = intel_ring_idle(ring);
2864 static void i965_write_fence_reg(struct drm_device *dev, int reg,
2865 struct drm_i915_gem_object *obj)
2867 drm_i915_private_t *dev_priv = dev->dev_private;
2869 int fence_pitch_shift;
2871 if (INTEL_INFO(dev)->gen >= 6) {
2872 fence_reg = FENCE_REG_SANDYBRIDGE_0;
2873 fence_pitch_shift = SANDYBRIDGE_FENCE_PITCH_SHIFT;
2875 fence_reg = FENCE_REG_965_0;
2876 fence_pitch_shift = I965_FENCE_PITCH_SHIFT;
2879 fence_reg += reg * 8;
2881 /* To w/a incoherency with non-atomic 64-bit register updates,
2882 * we split the 64-bit update into two 32-bit writes. In order
2883 * for a partial fence not to be evaluated between writes, we
2884 * precede the update with write to turn off the fence register,
2885 * and only enable the fence as the last step.
2887 * For extra levels of paranoia, we make sure each step lands
2888 * before applying the next step.
2890 I915_WRITE(fence_reg, 0);
2891 POSTING_READ(fence_reg);
2894 u32 size = i915_gem_obj_ggtt_size(obj);
2897 val = (uint64_t)((i915_gem_obj_ggtt_offset(obj) + size - 4096) &
2899 val |= i915_gem_obj_ggtt_offset(obj) & 0xfffff000;
2900 val |= (uint64_t)((obj->stride / 128) - 1) << fence_pitch_shift;
2901 if (obj->tiling_mode == I915_TILING_Y)
2902 val |= 1 << I965_FENCE_TILING_Y_SHIFT;
2903 val |= I965_FENCE_REG_VALID;
2905 I915_WRITE(fence_reg + 4, val >> 32);
2906 POSTING_READ(fence_reg + 4);
2908 I915_WRITE(fence_reg + 0, val);
2909 POSTING_READ(fence_reg);
2911 I915_WRITE(fence_reg + 4, 0);
2912 POSTING_READ(fence_reg + 4);
2916 static void i915_write_fence_reg(struct drm_device *dev, int reg,
2917 struct drm_i915_gem_object *obj)
2919 drm_i915_private_t *dev_priv = dev->dev_private;
2923 u32 size = i915_gem_obj_ggtt_size(obj);
2927 WARN((i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK) ||
2928 (size & -size) != size ||
2929 (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
2930 "object 0x%08lx [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
2931 i915_gem_obj_ggtt_offset(obj), obj->map_and_fenceable, size);
2933 if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
2938 /* Note: pitch better be a power of two tile widths */
2939 pitch_val = obj->stride / tile_width;
2940 pitch_val = ffs(pitch_val) - 1;
2942 val = i915_gem_obj_ggtt_offset(obj);
2943 if (obj->tiling_mode == I915_TILING_Y)
2944 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2945 val |= I915_FENCE_SIZE_BITS(size);
2946 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2947 val |= I830_FENCE_REG_VALID;
2952 reg = FENCE_REG_830_0 + reg * 4;
2954 reg = FENCE_REG_945_8 + (reg - 8) * 4;
2956 I915_WRITE(reg, val);
2960 static void i830_write_fence_reg(struct drm_device *dev, int reg,
2961 struct drm_i915_gem_object *obj)
2963 drm_i915_private_t *dev_priv = dev->dev_private;
2967 u32 size = i915_gem_obj_ggtt_size(obj);
2970 WARN((i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK) ||
2971 (size & -size) != size ||
2972 (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
2973 "object 0x%08lx not 512K or pot-size 0x%08x aligned\n",
2974 i915_gem_obj_ggtt_offset(obj), size);
2976 pitch_val = obj->stride / 128;
2977 pitch_val = ffs(pitch_val) - 1;
2979 val = i915_gem_obj_ggtt_offset(obj);
2980 if (obj->tiling_mode == I915_TILING_Y)
2981 val |= 1 << I830_FENCE_TILING_Y_SHIFT;
2982 val |= I830_FENCE_SIZE_BITS(size);
2983 val |= pitch_val << I830_FENCE_PITCH_SHIFT;
2984 val |= I830_FENCE_REG_VALID;
2988 I915_WRITE(FENCE_REG_830_0 + reg * 4, val);
2989 POSTING_READ(FENCE_REG_830_0 + reg * 4);
2992 inline static bool i915_gem_object_needs_mb(struct drm_i915_gem_object *obj)
2994 return obj && obj->base.read_domains & I915_GEM_DOMAIN_GTT;
2997 static void i915_gem_write_fence(struct drm_device *dev, int reg,
2998 struct drm_i915_gem_object *obj)
3000 struct drm_i915_private *dev_priv = dev->dev_private;
3002 /* Ensure that all CPU reads are completed before installing a fence
3003 * and all writes before removing the fence.
3005 if (i915_gem_object_needs_mb(dev_priv->fence_regs[reg].obj))
3008 WARN(obj && (!obj->stride || !obj->tiling_mode),
3009 "bogus fence setup with stride: 0x%x, tiling mode: %i\n",
3010 obj->stride, obj->tiling_mode);
3012 switch (INTEL_INFO(dev)->gen) {
3017 case 4: i965_write_fence_reg(dev, reg, obj); break;
3018 case 3: i915_write_fence_reg(dev, reg, obj); break;
3019 case 2: i830_write_fence_reg(dev, reg, obj); break;
3023 /* And similarly be paranoid that no direct access to this region
3024 * is reordered to before the fence is installed.
3026 if (i915_gem_object_needs_mb(obj))
3030 static inline int fence_number(struct drm_i915_private *dev_priv,
3031 struct drm_i915_fence_reg *fence)
3033 return fence - dev_priv->fence_regs;
3036 static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
3037 struct drm_i915_fence_reg *fence,
3040 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3041 int reg = fence_number(dev_priv, fence);
3043 i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
3046 obj->fence_reg = reg;
3048 list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
3050 obj->fence_reg = I915_FENCE_REG_NONE;
3052 list_del_init(&fence->lru_list);
3054 obj->fence_dirty = false;
3058 i915_gem_object_wait_fence(struct drm_i915_gem_object *obj)
3060 if (obj->last_fenced_seqno) {
3061 int ret = i915_wait_seqno(obj->ring, obj->last_fenced_seqno);
3065 obj->last_fenced_seqno = 0;
3068 obj->fenced_gpu_access = false;
3073 i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
3075 struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
3076 struct drm_i915_fence_reg *fence;
3079 ret = i915_gem_object_wait_fence(obj);
3083 if (obj->fence_reg == I915_FENCE_REG_NONE)
3086 fence = &dev_priv->fence_regs[obj->fence_reg];
3088 i915_gem_object_fence_lost(obj);
3089 i915_gem_object_update_fence(obj, fence, false);
3094 static struct drm_i915_fence_reg *
3095 i915_find_fence_reg(struct drm_device *dev)
3097 struct drm_i915_private *dev_priv = dev->dev_private;
3098 struct drm_i915_fence_reg *reg, *avail;
3101 /* First try to find a free reg */
3103 for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
3104 reg = &dev_priv->fence_regs[i];
3108 if (!reg->pin_count)
3115 /* None available, try to steal one or wait for a user to finish */
3116 list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
3124 /* Wait for completion of pending flips which consume fences */
3125 if (intel_has_pending_fb_unpin(dev))
3126 return ERR_PTR(-EAGAIN);
3128 return ERR_PTR(-EDEADLK);
3132 * i915_gem_object_get_fence - set up fencing for an object
3133 * @obj: object to map through a fence reg
3135 * When mapping objects through the GTT, userspace wants to be able to write
3136 * to them without having to worry about swizzling if the object is tiled.
3137 * This function walks the fence regs looking for a free one for @obj,
3138 * stealing one if it can't find any.
3140 * It then sets up the reg based on the object's properties: address, pitch
3141 * and tiling format.
3143 * For an untiled surface, this removes any existing fence.
3146 i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
3148 struct drm_device *dev = obj->base.dev;
3149 struct drm_i915_private *dev_priv = dev->dev_private;
3150 bool enable = obj->tiling_mode != I915_TILING_NONE;
3151 struct drm_i915_fence_reg *reg;
3154 /* Have we updated the tiling parameters upon the object and so
3155 * will need to serialise the write to the associated fence register?
3157 if (obj->fence_dirty) {
3158 ret = i915_gem_object_wait_fence(obj);
3163 /* Just update our place in the LRU if our fence is getting reused. */
3164 if (obj->fence_reg != I915_FENCE_REG_NONE) {
3165 reg = &dev_priv->fence_regs[obj->fence_reg];
3166 if (!obj->fence_dirty) {
3167 list_move_tail(®->lru_list,
3168 &dev_priv->mm.fence_list);
3171 } else if (enable) {
3172 reg = i915_find_fence_reg(dev);
3174 return PTR_ERR(reg);
3177 struct drm_i915_gem_object *old = reg->obj;
3179 ret = i915_gem_object_wait_fence(old);
3183 i915_gem_object_fence_lost(old);
3188 i915_gem_object_update_fence(obj, reg, enable);
3193 static bool i915_gem_valid_gtt_space(struct drm_device *dev,
3194 struct drm_mm_node *gtt_space,
3195 unsigned long cache_level)
3197 struct drm_mm_node *other;
3199 /* On non-LLC machines we have to be careful when putting differing
3200 * types of snoopable memory together to avoid the prefetcher
3201 * crossing memory domains and dying.
3206 if (!drm_mm_node_allocated(gtt_space))
3209 if (list_empty(>t_space->node_list))
3212 other = list_entry(gtt_space->node_list.prev, struct drm_mm_node, node_list);
3213 if (other->allocated && !other->hole_follows && other->color != cache_level)
3216 other = list_entry(gtt_space->node_list.next, struct drm_mm_node, node_list);
3217 if (other->allocated && !gtt_space->hole_follows && other->color != cache_level)
3223 static void i915_gem_verify_gtt(struct drm_device *dev)
3226 struct drm_i915_private *dev_priv = dev->dev_private;
3227 struct drm_i915_gem_object *obj;
3230 list_for_each_entry(obj, &dev_priv->mm.gtt_list, global_list) {
3231 if (obj->gtt_space == NULL) {
3232 printk(KERN_ERR "object found on GTT list with no space reserved\n");
3237 if (obj->cache_level != obj->gtt_space->color) {
3238 printk(KERN_ERR "object reserved space [%08lx, %08lx] with wrong color, cache_level=%x, color=%lx\n",
3239 i915_gem_obj_ggtt_offset(obj),
3240 i915_gem_obj_ggtt_offset(obj) + i915_gem_obj_ggtt_size(obj),
3242 obj->gtt_space->color);
3247 if (!i915_gem_valid_gtt_space(dev,
3249 obj->cache_level)) {
3250 printk(KERN_ERR "invalid GTT space found at [%08lx, %08lx] - color=%x\n",
3251 i915_gem_obj_ggtt_offset(obj),
3252 i915_gem_obj_ggtt_offset(obj) + i915_gem_obj_ggtt_size(obj),
3264 * Finds free space in the GTT aperture and binds the object there.
3267 i915_gem_object_bind_to_vm(struct drm_i915_gem_object *obj,
3268 struct i915_address_space *vm,
3270 bool map_and_fenceable,
3273 struct drm_device *dev = obj->base.dev;
3274 drm_i915_private_t *dev_priv = dev->dev_private;
3275 u32 size, fence_size, fence_alignment, unfenced_alignment;
3277 map_and_fenceable ? dev_priv->gtt.mappable_end : vm->total;
3278 struct i915_vma *vma;
3281 fence_size = i915_gem_get_gtt_size(dev,
3284 fence_alignment = i915_gem_get_gtt_alignment(dev,
3286 obj->tiling_mode, true);
3287 unfenced_alignment =
3288 i915_gem_get_gtt_alignment(dev,
3290 obj->tiling_mode, false);
3293 alignment = map_and_fenceable ? fence_alignment :
3295 if (map_and_fenceable && alignment & (fence_alignment - 1)) {
3296 DRM_ERROR("Invalid object alignment requested %u\n", alignment);
3300 size = map_and_fenceable ? fence_size : obj->base.size;
3302 /* If the object is bigger than the entire aperture, reject it early
3303 * before evicting everything in a vain attempt to find space.
3305 if (obj->base.size > gtt_max) {
3306 DRM_ERROR("Attempting to bind an object larger than the aperture: object=%zd > %s aperture=%zu\n",
3308 map_and_fenceable ? "mappable" : "total",
3313 ret = i915_gem_object_get_pages(obj);
3317 i915_gem_object_pin_pages(obj);
3319 vma = i915_gem_obj_lookup_or_create_vma(obj, vm);
3326 ret = drm_mm_insert_node_in_range_generic(&vm->mm, &vma->node,
3328 obj->cache_level, 0, gtt_max,
3329 DRM_MM_SEARCH_DEFAULT);
3331 ret = i915_gem_evict_something(dev, vm, size, alignment,
3340 if (WARN_ON(!i915_gem_valid_gtt_space(dev, &vma->node,
3341 obj->cache_level))) {
3343 goto err_remove_node;
3346 ret = i915_gem_gtt_prepare_object(obj);
3348 goto err_remove_node;
3350 list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
3351 list_add_tail(&vma->mm_list, &vm->inactive_list);
3353 if (i915_is_ggtt(vm)) {
3354 bool mappable, fenceable;
3356 fenceable = (vma->node.size == fence_size &&
3357 (vma->node.start & (fence_alignment - 1)) == 0);
3359 mappable = (vma->node.start + obj->base.size <=
3360 dev_priv->gtt.mappable_end);
3362 obj->map_and_fenceable = mappable && fenceable;
3365 WARN_ON(map_and_fenceable && !obj->map_and_fenceable);
3367 trace_i915_vma_bind(vma, map_and_fenceable);
3368 i915_gem_verify_gtt(dev);
3372 drm_mm_remove_node(&vma->node);
3374 i915_gem_vma_destroy(vma);
3376 i915_gem_object_unpin_pages(obj);
3381 i915_gem_clflush_object(struct drm_i915_gem_object *obj,
3384 /* If we don't have a page list set up, then we're not pinned
3385 * to GPU, and we can ignore the cache flush because it'll happen
3386 * again at bind time.
3388 if (obj->pages == NULL)
3392 * Stolen memory is always coherent with the GPU as it is explicitly
3393 * marked as wc by the system, or the system is cache-coherent.
3398 /* If the GPU is snooping the contents of the CPU cache,
3399 * we do not need to manually clear the CPU cache lines. However,
3400 * the caches are only snooped when the render cache is
3401 * flushed/invalidated. As we always have to emit invalidations
3402 * and flushes when moving into and out of the RENDER domain, correct
3403 * snooping behaviour occurs naturally as the result of our domain
3406 if (!force && cpu_cache_is_coherent(obj->base.dev, obj->cache_level))
3409 trace_i915_gem_object_clflush(obj);
3410 drm_clflush_sg(obj->pages);
3415 /** Flushes the GTT write domain for the object if it's dirty. */
3417 i915_gem_object_flush_gtt_write_domain(struct drm_i915_gem_object *obj)
3419 uint32_t old_write_domain;
3421 if (obj->base.write_domain != I915_GEM_DOMAIN_GTT)
3424 /* No actual flushing is required for the GTT write domain. Writes
3425 * to it immediately go to main memory as far as we know, so there's
3426 * no chipset flush. It also doesn't land in render cache.
3428 * However, we do have to enforce the order so that all writes through
3429 * the GTT land before any writes to the device, such as updates to
3434 old_write_domain = obj->base.write_domain;
3435 obj->base.write_domain = 0;
3437 trace_i915_gem_object_change_domain(obj,
3438 obj->base.read_domains,
3442 /** Flushes the CPU write domain for the object if it's dirty. */
3444 i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj,
3447 uint32_t old_write_domain;
3449 if (obj->base.write_domain != I915_GEM_DOMAIN_CPU)
3452 if (i915_gem_clflush_object(obj, force))
3453 i915_gem_chipset_flush(obj->base.dev);
3455 old_write_domain = obj->base.write_domain;
3456 obj->base.write_domain = 0;
3458 trace_i915_gem_object_change_domain(obj,
3459 obj->base.read_domains,
3464 * Moves a single object to the GTT read, and possibly write domain.
3466 * This function returns when the move is complete, including waiting on
3470 i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
3472 drm_i915_private_t *dev_priv = obj->base.dev->dev_private;
3473 uint32_t old_write_domain, old_read_domains;
3476 /* Not valid to be called on unbound objects. */
3477 if (!i915_gem_obj_bound_any(obj))
3480 if (obj->base.write_domain == I915_GEM_DOMAIN_GTT)
3483 ret = i915_gem_object_wait_rendering(obj, !write);
3487 i915_gem_object_flush_cpu_write_domain(obj, false);
3489 /* Serialise direct access to this object with the barriers for
3490 * coherent writes from the GPU, by effectively invalidating the
3491 * GTT domain upon first access.
3493 if ((obj->base.read_domains & I915_GEM_DOMAIN_GTT) == 0)
3496 old_write_domain = obj->base.write_domain;
3497 old_read_domains = obj->base.read_domains;
3499 /* It should now be out of any other write domains, and we can update
3500 * the domain values for our changes.
3502 BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
3503 obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3505 obj->base.read_domains = I915_GEM_DOMAIN_GTT;
3506 obj->base.write_domain = I915_GEM_DOMAIN_GTT;
3510 trace_i915_gem_object_change_domain(obj,
3514 /* And bump the LRU for this access */
3515 if (i915_gem_object_is_inactive(obj)) {
3516 struct i915_vma *vma = i915_gem_obj_to_ggtt(obj);
3518 list_move_tail(&vma->mm_list,
3519 &dev_priv->gtt.base.inactive_list);
3526 int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
3527 enum i915_cache_level cache_level)
3529 struct drm_device *dev = obj->base.dev;
3530 struct i915_vma *vma;
3533 if (obj->cache_level == cache_level)
3536 if (i915_gem_obj_is_pinned(obj)) {
3537 DRM_DEBUG("can not change the cache level of pinned objects\n");
3541 list_for_each_entry(vma, &obj->vma_list, vma_link) {
3542 if (!i915_gem_valid_gtt_space(dev, &vma->node, cache_level)) {
3543 ret = i915_vma_unbind(vma);
3551 if (i915_gem_obj_bound_any(obj)) {
3552 ret = i915_gem_object_finish_gpu(obj);
3556 i915_gem_object_finish_gtt(obj);
3558 /* Before SandyBridge, you could not use tiling or fence
3559 * registers with snooped memory, so relinquish any fences
3560 * currently pointing to our region in the aperture.
3562 if (INTEL_INFO(dev)->gen < 6) {
3563 ret = i915_gem_object_put_fence(obj);
3568 list_for_each_entry(vma, &obj->vma_list, vma_link)
3569 vma->bind_vma(vma, cache_level, 0);
3572 list_for_each_entry(vma, &obj->vma_list, vma_link)
3573 vma->node.color = cache_level;
3574 obj->cache_level = cache_level;
3576 if (cpu_write_needs_clflush(obj)) {
3577 u32 old_read_domains, old_write_domain;
3579 /* If we're coming from LLC cached, then we haven't
3580 * actually been tracking whether the data is in the
3581 * CPU cache or not, since we only allow one bit set
3582 * in obj->write_domain and have been skipping the clflushes.
3583 * Just set it to the CPU cache for now.
3585 WARN_ON(obj->base.write_domain & ~I915_GEM_DOMAIN_CPU);
3587 old_read_domains = obj->base.read_domains;
3588 old_write_domain = obj->base.write_domain;
3590 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
3591 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
3593 trace_i915_gem_object_change_domain(obj,
3598 i915_gem_verify_gtt(dev);
3602 int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
3603 struct drm_file *file)
3605 struct drm_i915_gem_caching *args = data;
3606 struct drm_i915_gem_object *obj;
3609 ret = i915_mutex_lock_interruptible(dev);
3613 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3614 if (&obj->base == NULL) {
3619 switch (obj->cache_level) {
3620 case I915_CACHE_LLC:
3621 case I915_CACHE_L3_LLC:
3622 args->caching = I915_CACHING_CACHED;
3626 args->caching = I915_CACHING_DISPLAY;
3630 args->caching = I915_CACHING_NONE;
3634 drm_gem_object_unreference(&obj->base);
3636 mutex_unlock(&dev->struct_mutex);
3640 int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
3641 struct drm_file *file)
3643 struct drm_i915_gem_caching *args = data;
3644 struct drm_i915_gem_object *obj;
3645 enum i915_cache_level level;
3648 switch (args->caching) {
3649 case I915_CACHING_NONE:
3650 level = I915_CACHE_NONE;
3652 case I915_CACHING_CACHED:
3653 level = I915_CACHE_LLC;
3655 case I915_CACHING_DISPLAY:
3656 level = HAS_WT(dev) ? I915_CACHE_WT : I915_CACHE_NONE;
3662 ret = i915_mutex_lock_interruptible(dev);
3666 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3667 if (&obj->base == NULL) {
3672 ret = i915_gem_object_set_cache_level(obj, level);
3674 drm_gem_object_unreference(&obj->base);
3676 mutex_unlock(&dev->struct_mutex);
3680 static bool is_pin_display(struct drm_i915_gem_object *obj)
3682 /* There are 3 sources that pin objects:
3683 * 1. The display engine (scanouts, sprites, cursors);
3684 * 2. Reservations for execbuffer;
3687 * We can ignore reservations as we hold the struct_mutex and
3688 * are only called outside of the reservation path. The user
3689 * can only increment pin_count once, and so if after
3690 * subtracting the potential reference by the user, any pin_count
3691 * remains, it must be due to another use by the display engine.
3693 return i915_gem_obj_to_ggtt(obj)->pin_count - !!obj->user_pin_count;
3697 * Prepare buffer for display plane (scanout, cursors, etc).
3698 * Can be called from an uninterruptible phase (modesetting) and allows
3699 * any flushes to be pipelined (for pageflips).
3702 i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
3704 struct intel_ring_buffer *pipelined)
3706 u32 old_read_domains, old_write_domain;
3709 if (pipelined != obj->ring) {
3710 ret = i915_gem_object_sync(obj, pipelined);
3715 /* Mark the pin_display early so that we account for the
3716 * display coherency whilst setting up the cache domains.
3718 obj->pin_display = true;
3720 /* The display engine is not coherent with the LLC cache on gen6. As
3721 * a result, we make sure that the pinning that is about to occur is
3722 * done with uncached PTEs. This is lowest common denominator for all
3725 * However for gen6+, we could do better by using the GFDT bit instead
3726 * of uncaching, which would allow us to flush all the LLC-cached data
3727 * with that bit in the PTE to main memory with just one PIPE_CONTROL.
3729 ret = i915_gem_object_set_cache_level(obj,
3730 HAS_WT(obj->base.dev) ? I915_CACHE_WT : I915_CACHE_NONE);
3732 goto err_unpin_display;
3734 /* As the user may map the buffer once pinned in the display plane
3735 * (e.g. libkms for the bootup splash), we have to ensure that we
3736 * always use map_and_fenceable for all scanout buffers.
3738 ret = i915_gem_obj_ggtt_pin(obj, alignment, true, false);
3740 goto err_unpin_display;
3742 i915_gem_object_flush_cpu_write_domain(obj, true);
3744 old_write_domain = obj->base.write_domain;
3745 old_read_domains = obj->base.read_domains;
3747 /* It should now be out of any other write domains, and we can update
3748 * the domain values for our changes.
3750 obj->base.write_domain = 0;
3751 obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
3753 trace_i915_gem_object_change_domain(obj,
3760 obj->pin_display = is_pin_display(obj);
3765 i915_gem_object_unpin_from_display_plane(struct drm_i915_gem_object *obj)
3767 i915_gem_object_ggtt_unpin(obj);
3768 obj->pin_display = is_pin_display(obj);
3772 i915_gem_object_finish_gpu(struct drm_i915_gem_object *obj)
3776 if ((obj->base.read_domains & I915_GEM_GPU_DOMAINS) == 0)
3779 ret = i915_gem_object_wait_rendering(obj, false);
3783 /* Ensure that we invalidate the GPU's caches and TLBs. */
3784 obj->base.read_domains &= ~I915_GEM_GPU_DOMAINS;
3789 * Moves a single object to the CPU read, and possibly write domain.
3791 * This function returns when the move is complete, including waiting on
3795 i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
3797 uint32_t old_write_domain, old_read_domains;
3800 if (obj->base.write_domain == I915_GEM_DOMAIN_CPU)
3803 ret = i915_gem_object_wait_rendering(obj, !write);
3807 i915_gem_object_flush_gtt_write_domain(obj);
3809 old_write_domain = obj->base.write_domain;
3810 old_read_domains = obj->base.read_domains;
3812 /* Flush the CPU cache if it's still invalid. */
3813 if ((obj->base.read_domains & I915_GEM_DOMAIN_CPU) == 0) {
3814 i915_gem_clflush_object(obj, false);
3816 obj->base.read_domains |= I915_GEM_DOMAIN_CPU;
3819 /* It should now be out of any other write domains, and we can update
3820 * the domain values for our changes.
3822 BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_CPU) != 0);
3824 /* If we're writing through the CPU, then the GPU read domains will
3825 * need to be invalidated at next use.
3828 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
3829 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
3832 trace_i915_gem_object_change_domain(obj,
3839 /* Throttle our rendering by waiting until the ring has completed our requests
3840 * emitted over 20 msec ago.
3842 * Note that if we were to use the current jiffies each time around the loop,
3843 * we wouldn't escape the function with any frames outstanding if the time to
3844 * render a frame was over 20ms.
3846 * This should get us reasonable parallelism between CPU and GPU but also
3847 * relatively low latency when blocking on a particular request to finish.
3850 i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
3852 struct drm_i915_private *dev_priv = dev->dev_private;
3853 struct drm_i915_file_private *file_priv = file->driver_priv;
3854 unsigned long recent_enough = jiffies - msecs_to_jiffies(20);
3855 struct drm_i915_gem_request *request;
3856 struct intel_ring_buffer *ring = NULL;
3857 unsigned reset_counter;
3861 ret = i915_gem_wait_for_error(&dev_priv->gpu_error);
3865 ret = i915_gem_check_wedge(&dev_priv->gpu_error, false);
3869 spin_lock(&file_priv->mm.lock);
3870 list_for_each_entry(request, &file_priv->mm.request_list, client_list) {
3871 if (time_after_eq(request->emitted_jiffies, recent_enough))
3874 ring = request->ring;
3875 seqno = request->seqno;
3877 reset_counter = atomic_read(&dev_priv->gpu_error.reset_counter);
3878 spin_unlock(&file_priv->mm.lock);
3883 ret = __wait_seqno(ring, seqno, reset_counter, true, NULL, NULL);
3885 queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
3891 i915_gem_object_pin(struct drm_i915_gem_object *obj,
3892 struct i915_address_space *vm,
3894 bool map_and_fenceable,
3897 const u32 flags = map_and_fenceable ? GLOBAL_BIND : 0;
3898 struct i915_vma *vma;
3901 WARN_ON(map_and_fenceable && !i915_is_ggtt(vm));
3903 vma = i915_gem_obj_to_vma(obj, vm);
3906 if (WARN_ON(vma->pin_count == DRM_I915_GEM_OBJECT_MAX_PIN_COUNT))
3910 vma->node.start & (alignment - 1)) ||
3911 (map_and_fenceable && !obj->map_and_fenceable)) {
3912 WARN(vma->pin_count,
3913 "bo is already pinned with incorrect alignment:"
3914 " offset=%lx, req.alignment=%x, req.map_and_fenceable=%d,"
3915 " obj->map_and_fenceable=%d\n",
3916 i915_gem_obj_offset(obj, vm), alignment,
3918 obj->map_and_fenceable);
3919 ret = i915_vma_unbind(vma);
3925 if (!i915_gem_obj_bound(obj, vm)) {
3926 ret = i915_gem_object_bind_to_vm(obj, vm, alignment,
3934 vma = i915_gem_obj_to_vma(obj, vm);
3936 vma->bind_vma(vma, obj->cache_level, flags);
3938 i915_gem_obj_to_vma(obj, vm)->pin_count++;
3939 obj->pin_mappable |= map_and_fenceable;
3945 i915_gem_object_ggtt_unpin(struct drm_i915_gem_object *obj)
3947 struct i915_vma *vma = i915_gem_obj_to_ggtt(obj);
3950 BUG_ON(vma->pin_count == 0);
3951 BUG_ON(!i915_gem_obj_ggtt_bound(obj));
3953 if (--vma->pin_count == 0)
3954 obj->pin_mappable = false;
3958 i915_gem_pin_ioctl(struct drm_device *dev, void *data,
3959 struct drm_file *file)
3961 struct drm_i915_gem_pin *args = data;
3962 struct drm_i915_gem_object *obj;
3965 if (INTEL_INFO(dev)->gen >= 6)
3968 ret = i915_mutex_lock_interruptible(dev);
3972 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
3973 if (&obj->base == NULL) {
3978 if (obj->madv != I915_MADV_WILLNEED) {
3979 DRM_ERROR("Attempting to pin a purgeable buffer\n");
3984 if (obj->pin_filp != NULL && obj->pin_filp != file) {
3985 DRM_ERROR("Already pinned in i915_gem_pin_ioctl(): %d\n",
3991 if (obj->user_pin_count == ULONG_MAX) {
3996 if (obj->user_pin_count == 0) {
3997 ret = i915_gem_obj_ggtt_pin(obj, args->alignment, true, false);
4002 obj->user_pin_count++;
4003 obj->pin_filp = file;
4005 args->offset = i915_gem_obj_ggtt_offset(obj);
4007 drm_gem_object_unreference(&obj->base);
4009 mutex_unlock(&dev->struct_mutex);
4014 i915_gem_unpin_ioctl(struct drm_device *dev, void *data,
4015 struct drm_file *file)
4017 struct drm_i915_gem_pin *args = data;
4018 struct drm_i915_gem_object *obj;
4021 ret = i915_mutex_lock_interruptible(dev);
4025 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
4026 if (&obj->base == NULL) {
4031 if (obj->pin_filp != file) {
4032 DRM_ERROR("Not pinned by caller in i915_gem_pin_ioctl(): %d\n",
4037 obj->user_pin_count--;
4038 if (obj->user_pin_count == 0) {
4039 obj->pin_filp = NULL;
4040 i915_gem_object_ggtt_unpin(obj);
4044 drm_gem_object_unreference(&obj->base);
4046 mutex_unlock(&dev->struct_mutex);
4051 i915_gem_busy_ioctl(struct drm_device *dev, void *data,
4052 struct drm_file *file)
4054 struct drm_i915_gem_busy *args = data;
4055 struct drm_i915_gem_object *obj;
4058 ret = i915_mutex_lock_interruptible(dev);
4062 obj = to_intel_bo(drm_gem_object_lookup(dev, file, args->handle));
4063 if (&obj->base == NULL) {
4068 /* Count all active objects as busy, even if they are currently not used
4069 * by the gpu. Users of this interface expect objects to eventually
4070 * become non-busy without any further actions, therefore emit any
4071 * necessary flushes here.
4073 ret = i915_gem_object_flush_active(obj);
4075 args->busy = obj->active;
4077 BUILD_BUG_ON(I915_NUM_RINGS > 16);
4078 args->busy |= intel_ring_flag(obj->ring) << 16;
4081 drm_gem_object_unreference(&obj->base);
4083 mutex_unlock(&dev->struct_mutex);
4088 i915_gem_throttle_ioctl(struct drm_device *dev, void *data,
4089 struct drm_file *file_priv)
4091 return i915_gem_ring_throttle(dev, file_priv);
4095 i915_gem_madvise_ioctl(struct drm_device *dev, void *data,
4096 struct drm_file *file_priv)
4098 struct drm_i915_gem_madvise *args = data;
4099 struct drm_i915_gem_object *obj;
4102 switch (args->madv) {
4103 case I915_MADV_DONTNEED:
4104 case I915_MADV_WILLNEED:
4110 ret = i915_mutex_lock_interruptible(dev);
4114 obj = to_intel_bo(drm_gem_object_lookup(dev, file_priv, args->handle));
4115 if (&obj->base == NULL) {
4120 if (i915_gem_obj_is_pinned(obj)) {
4125 if (obj->madv != __I915_MADV_PURGED)
4126 obj->madv = args->madv;
4128 /* if the object is no longer attached, discard its backing storage */
4129 if (i915_gem_object_is_purgeable(obj) && obj->pages == NULL)
4130 i915_gem_object_truncate(obj);
4132 args->retained = obj->madv != __I915_MADV_PURGED;
4135 drm_gem_object_unreference(&obj->base);
4137 mutex_unlock(&dev->struct_mutex);
4141 void i915_gem_object_init(struct drm_i915_gem_object *obj,
4142 const struct drm_i915_gem_object_ops *ops)
4144 INIT_LIST_HEAD(&obj->global_list);
4145 INIT_LIST_HEAD(&obj->ring_list);
4146 INIT_LIST_HEAD(&obj->obj_exec_link);
4147 INIT_LIST_HEAD(&obj->vma_list);
4151 obj->fence_reg = I915_FENCE_REG_NONE;
4152 obj->madv = I915_MADV_WILLNEED;
4153 /* Avoid an unnecessary call to unbind on the first bind. */
4154 obj->map_and_fenceable = true;
4156 i915_gem_info_add_obj(obj->base.dev->dev_private, obj->base.size);
4159 static const struct drm_i915_gem_object_ops i915_gem_object_ops = {
4160 .get_pages = i915_gem_object_get_pages_gtt,
4161 .put_pages = i915_gem_object_put_pages_gtt,
4164 struct drm_i915_gem_object *i915_gem_alloc_object(struct drm_device *dev,
4167 struct drm_i915_gem_object *obj;
4168 struct address_space *mapping;
4171 obj = i915_gem_object_alloc(dev);
4175 if (drm_gem_object_init(dev, &obj->base, size) != 0) {
4176 i915_gem_object_free(obj);
4180 mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
4181 if (IS_CRESTLINE(dev) || IS_BROADWATER(dev)) {
4182 /* 965gm cannot relocate objects above 4GiB. */
4183 mask &= ~__GFP_HIGHMEM;
4184 mask |= __GFP_DMA32;
4187 mapping = file_inode(obj->base.filp)->i_mapping;
4188 mapping_set_gfp_mask(mapping, mask);
4190 i915_gem_object_init(obj, &i915_gem_object_ops);
4192 obj->base.write_domain = I915_GEM_DOMAIN_CPU;
4193 obj->base.read_domains = I915_GEM_DOMAIN_CPU;
4196 /* On some devices, we can have the GPU use the LLC (the CPU
4197 * cache) for about a 10% performance improvement
4198 * compared to uncached. Graphics requests other than
4199 * display scanout are coherent with the CPU in
4200 * accessing this cache. This means in this mode we
4201 * don't need to clflush on the CPU side, and on the
4202 * GPU side we only need to flush internal caches to
4203 * get data visible to the CPU.
4205 * However, we maintain the display planes as UC, and so
4206 * need to rebind when first used as such.
4208 obj->cache_level = I915_CACHE_LLC;
4210 obj->cache_level = I915_CACHE_NONE;
4212 trace_i915_gem_object_create(obj);
4217 void i915_gem_free_object(struct drm_gem_object *gem_obj)
4219 struct drm_i915_gem_object *obj = to_intel_bo(gem_obj);
4220 struct drm_device *dev = obj->base.dev;
4221 drm_i915_private_t *dev_priv = dev->dev_private;
4222 struct i915_vma *vma, *next;
4224 intel_runtime_pm_get(dev_priv);
4226 trace_i915_gem_object_destroy(obj);
4229 i915_gem_detach_phys_object(dev, obj);
4231 list_for_each_entry_safe(vma, next, &obj->vma_list, vma_link) {
4235 ret = i915_vma_unbind(vma);
4236 if (WARN_ON(ret == -ERESTARTSYS)) {
4237 bool was_interruptible;
4239 was_interruptible = dev_priv->mm.interruptible;
4240 dev_priv->mm.interruptible = false;
4242 WARN_ON(i915_vma_unbind(vma));
4244 dev_priv->mm.interruptible = was_interruptible;
4248 /* Stolen objects don't hold a ref, but do hold pin count. Fix that up
4249 * before progressing. */
4251 i915_gem_object_unpin_pages(obj);
4253 if (WARN_ON(obj->pages_pin_count))
4254 obj->pages_pin_count = 0;
4255 i915_gem_object_put_pages(obj);
4256 i915_gem_object_free_mmap_offset(obj);
4257 i915_gem_object_release_stolen(obj);
4261 if (obj->base.import_attach)
4262 drm_prime_gem_destroy(&obj->base, NULL);
4264 drm_gem_object_release(&obj->base);
4265 i915_gem_info_remove_obj(dev_priv, obj->base.size);
4268 i915_gem_object_free(obj);
4270 intel_runtime_pm_put(dev_priv);
4273 struct i915_vma *i915_gem_obj_to_vma(struct drm_i915_gem_object *obj,
4274 struct i915_address_space *vm)
4276 struct i915_vma *vma;
4277 list_for_each_entry(vma, &obj->vma_list, vma_link)
4284 void i915_gem_vma_destroy(struct i915_vma *vma)
4286 WARN_ON(vma->node.allocated);
4288 /* Keep the vma as a placeholder in the execbuffer reservation lists */
4289 if (!list_empty(&vma->exec_list))
4292 list_del(&vma->vma_link);
4298 i915_gem_suspend(struct drm_device *dev)
4300 drm_i915_private_t *dev_priv = dev->dev_private;
4303 mutex_lock(&dev->struct_mutex);
4304 if (dev_priv->ums.mm_suspended)
4307 ret = i915_gpu_idle(dev);
4311 i915_gem_retire_requests(dev);
4313 /* Under UMS, be paranoid and evict. */
4314 if (!drm_core_check_feature(dev, DRIVER_MODESET))
4315 i915_gem_evict_everything(dev);
4317 i915_kernel_lost_context(dev);
4318 i915_gem_cleanup_ringbuffer(dev);
4320 /* Hack! Don't let anybody do execbuf while we don't control the chip.
4321 * We need to replace this with a semaphore, or something.
4322 * And not confound ums.mm_suspended!
4324 dev_priv->ums.mm_suspended = !drm_core_check_feature(dev,
4326 mutex_unlock(&dev->struct_mutex);
4328 del_timer_sync(&dev_priv->gpu_error.hangcheck_timer);
4329 cancel_delayed_work_sync(&dev_priv->mm.retire_work);
4330 cancel_delayed_work_sync(&dev_priv->mm.idle_work);
4335 mutex_unlock(&dev->struct_mutex);
4339 int i915_gem_l3_remap(struct intel_ring_buffer *ring, int slice)
4341 struct drm_device *dev = ring->dev;
4342 drm_i915_private_t *dev_priv = dev->dev_private;
4343 u32 reg_base = GEN7_L3LOG_BASE + (slice * 0x200);
4344 u32 *remap_info = dev_priv->l3_parity.remap_info[slice];
4347 if (!HAS_L3_DPF(dev) || !remap_info)
4350 ret = intel_ring_begin(ring, GEN7_L3LOG_SIZE / 4 * 3);
4355 * Note: We do not worry about the concurrent register cacheline hang
4356 * here because no other code should access these registers other than
4357 * at initialization time.
4359 for (i = 0; i < GEN7_L3LOG_SIZE; i += 4) {
4360 intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1));
4361 intel_ring_emit(ring, reg_base + i);
4362 intel_ring_emit(ring, remap_info[i/4]);
4365 intel_ring_advance(ring);
4370 void i915_gem_init_swizzling(struct drm_device *dev)
4372 drm_i915_private_t *dev_priv = dev->dev_private;
4374 if (INTEL_INFO(dev)->gen < 5 ||
4375 dev_priv->mm.bit_6_swizzle_x == I915_BIT_6_SWIZZLE_NONE)
4378 I915_WRITE(DISP_ARB_CTL, I915_READ(DISP_ARB_CTL) |
4379 DISP_TILE_SURFACE_SWIZZLING);
4384 I915_WRITE(TILECTL, I915_READ(TILECTL) | TILECTL_SWZCTL);
4386 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_SNB));
4387 else if (IS_GEN7(dev))
4388 I915_WRITE(ARB_MODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_IVB));
4389 else if (IS_GEN8(dev))
4390 I915_WRITE(GAMTARBMODE, _MASKED_BIT_ENABLE(ARB_MODE_SWIZZLE_BDW));
4396 intel_enable_blt(struct drm_device *dev)
4401 /* The blitter was dysfunctional on early prototypes */
4402 if (IS_GEN6(dev) && dev->pdev->revision < 8) {
4403 DRM_INFO("BLT not supported on this pre-production hardware;"
4404 " graphics performance will be degraded.\n");
4411 static int i915_gem_init_rings(struct drm_device *dev)
4413 struct drm_i915_private *dev_priv = dev->dev_private;
4416 ret = intel_init_render_ring_buffer(dev);
4421 ret = intel_init_bsd_ring_buffer(dev);
4423 goto cleanup_render_ring;
4426 if (intel_enable_blt(dev)) {
4427 ret = intel_init_blt_ring_buffer(dev);
4429 goto cleanup_bsd_ring;
4432 if (HAS_VEBOX(dev)) {
4433 ret = intel_init_vebox_ring_buffer(dev);
4435 goto cleanup_blt_ring;
4439 ret = i915_gem_set_seqno(dev, ((u32)~0 - 0x1000));
4441 goto cleanup_vebox_ring;
4446 intel_cleanup_ring_buffer(&dev_priv->ring[VECS]);
4448 intel_cleanup_ring_buffer(&dev_priv->ring[BCS]);
4450 intel_cleanup_ring_buffer(&dev_priv->ring[VCS]);
4451 cleanup_render_ring:
4452 intel_cleanup_ring_buffer(&dev_priv->ring[RCS]);
4458 i915_gem_init_hw(struct drm_device *dev)
4460 drm_i915_private_t *dev_priv = dev->dev_private;
4463 if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
4466 if (dev_priv->ellc_size)
4467 I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf));
4469 if (IS_HASWELL(dev))
4470 I915_WRITE(MI_PREDICATE_RESULT_2, IS_HSW_GT3(dev) ?
4471 LOWER_SLICE_ENABLED : LOWER_SLICE_DISABLED);
4473 if (HAS_PCH_NOP(dev)) {
4474 u32 temp = I915_READ(GEN7_MSG_CTL);
4475 temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK);
4476 I915_WRITE(GEN7_MSG_CTL, temp);
4479 i915_gem_init_swizzling(dev);
4481 ret = i915_gem_init_rings(dev);
4485 for (i = 0; i < NUM_L3_SLICES(dev); i++)
4486 i915_gem_l3_remap(&dev_priv->ring[RCS], i);
4489 * XXX: Contexts should only be initialized once. Doing a switch to the
4490 * default context switch however is something we'd like to do after
4491 * reset or thaw (the latter may not actually be necessary for HW, but
4492 * goes with our code better). Context switching requires rings (for
4493 * the do_switch), but before enabling PPGTT. So don't move this.
4495 ret = i915_gem_context_enable(dev_priv);
4497 DRM_ERROR("Context enable failed %d\n", ret);
4504 i915_gem_cleanup_ringbuffer(dev);
4508 int i915_gem_init(struct drm_device *dev)
4510 struct drm_i915_private *dev_priv = dev->dev_private;
4513 mutex_lock(&dev->struct_mutex);
4515 if (IS_VALLEYVIEW(dev)) {
4516 /* VLVA0 (potential hack), BIOS isn't actually waking us */
4517 I915_WRITE(VLV_GTLC_WAKE_CTRL, 1);
4518 if (wait_for((I915_READ(VLV_GTLC_PW_STATUS) & 1) == 1, 10))
4519 DRM_DEBUG_DRIVER("allow wake ack timed out\n");
4522 i915_gem_init_global_gtt(dev);
4524 ret = i915_gem_context_init(dev);
4528 ret = i915_gem_init_hw(dev);
4529 mutex_unlock(&dev->struct_mutex);
4531 WARN_ON(dev_priv->mm.aliasing_ppgtt);
4532 i915_gem_context_fini(dev);
4533 drm_mm_takedown(&dev_priv->gtt.base.mm);
4537 /* Allow hardware batchbuffers unless told otherwise, but not for KMS. */
4538 if (!drm_core_check_feature(dev, DRIVER_MODESET))
4539 dev_priv->dri1.allow_batchbuffer = 1;
4544 i915_gem_cleanup_ringbuffer(struct drm_device *dev)
4546 drm_i915_private_t *dev_priv = dev->dev_private;
4547 struct intel_ring_buffer *ring;
4550 for_each_ring(ring, dev_priv, i)
4551 intel_cleanup_ring_buffer(ring);
4555 i915_gem_entervt_ioctl(struct drm_device *dev, void *data,
4556 struct drm_file *file_priv)
4558 struct drm_i915_private *dev_priv = dev->dev_private;
4561 if (drm_core_check_feature(dev, DRIVER_MODESET))
4564 if (i915_reset_in_progress(&dev_priv->gpu_error)) {
4565 DRM_ERROR("Reenabling wedged hardware, good luck\n");
4566 atomic_set(&dev_priv->gpu_error.reset_counter, 0);
4569 mutex_lock(&dev->struct_mutex);
4570 dev_priv->ums.mm_suspended = 0;
4572 ret = i915_gem_init_hw(dev);
4574 mutex_unlock(&dev->struct_mutex);
4578 BUG_ON(!list_empty(&dev_priv->gtt.base.active_list));
4579 mutex_unlock(&dev->struct_mutex);
4581 ret = drm_irq_install(dev);
4583 goto cleanup_ringbuffer;
4588 mutex_lock(&dev->struct_mutex);
4589 i915_gem_cleanup_ringbuffer(dev);
4590 dev_priv->ums.mm_suspended = 1;
4591 mutex_unlock(&dev->struct_mutex);
4597 i915_gem_leavevt_ioctl(struct drm_device *dev, void *data,
4598 struct drm_file *file_priv)
4600 if (drm_core_check_feature(dev, DRIVER_MODESET))
4603 drm_irq_uninstall(dev);
4605 return i915_gem_suspend(dev);
4609 i915_gem_lastclose(struct drm_device *dev)
4613 if (drm_core_check_feature(dev, DRIVER_MODESET))
4616 ret = i915_gem_suspend(dev);
4618 DRM_ERROR("failed to idle hardware: %d\n", ret);
4622 init_ring_lists(struct intel_ring_buffer *ring)
4624 INIT_LIST_HEAD(&ring->active_list);
4625 INIT_LIST_HEAD(&ring->request_list);
4628 void i915_init_vm(struct drm_i915_private *dev_priv,
4629 struct i915_address_space *vm)
4631 if (!i915_is_ggtt(vm))
4632 drm_mm_init(&vm->mm, vm->start, vm->total);
4633 vm->dev = dev_priv->dev;
4634 INIT_LIST_HEAD(&vm->active_list);
4635 INIT_LIST_HEAD(&vm->inactive_list);
4636 INIT_LIST_HEAD(&vm->global_link);
4637 list_add_tail(&vm->global_link, &dev_priv->vm_list);
4641 i915_gem_load(struct drm_device *dev)
4643 drm_i915_private_t *dev_priv = dev->dev_private;
4647 kmem_cache_create("i915_gem_object",
4648 sizeof(struct drm_i915_gem_object), 0,
4652 INIT_LIST_HEAD(&dev_priv->vm_list);
4653 i915_init_vm(dev_priv, &dev_priv->gtt.base);
4655 INIT_LIST_HEAD(&dev_priv->context_list);
4656 INIT_LIST_HEAD(&dev_priv->mm.unbound_list);
4657 INIT_LIST_HEAD(&dev_priv->mm.bound_list);
4658 INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4659 for (i = 0; i < I915_NUM_RINGS; i++)
4660 init_ring_lists(&dev_priv->ring[i]);
4661 for (i = 0; i < I915_MAX_NUM_FENCES; i++)
4662 INIT_LIST_HEAD(&dev_priv->fence_regs[i].lru_list);
4663 INIT_DELAYED_WORK(&dev_priv->mm.retire_work,
4664 i915_gem_retire_work_handler);
4665 INIT_DELAYED_WORK(&dev_priv->mm.idle_work,
4666 i915_gem_idle_work_handler);
4667 init_waitqueue_head(&dev_priv->gpu_error.reset_queue);
4669 /* On GEN3 we really need to make sure the ARB C3 LP bit is set */
4671 I915_WRITE(MI_ARB_STATE,
4672 _MASKED_BIT_ENABLE(MI_ARB_C3_LP_WRITE_ENABLE));
4675 dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL;
4677 /* Old X drivers will take 0-2 for front, back, depth buffers */
4678 if (!drm_core_check_feature(dev, DRIVER_MODESET))
4679 dev_priv->fence_reg_start = 3;
4681 if (INTEL_INFO(dev)->gen >= 7 && !IS_VALLEYVIEW(dev))
4682 dev_priv->num_fence_regs = 32;
4683 else if (INTEL_INFO(dev)->gen >= 4 || IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
4684 dev_priv->num_fence_regs = 16;
4686 dev_priv->num_fence_regs = 8;
4688 /* Initialize fence registers to zero */
4689 INIT_LIST_HEAD(&dev_priv->mm.fence_list);
4690 i915_gem_restore_fences(dev);
4692 i915_gem_detect_bit_6_swizzle(dev);
4693 init_waitqueue_head(&dev_priv->pending_flip_queue);
4695 dev_priv->mm.interruptible = true;
4697 dev_priv->mm.inactive_shrinker.scan_objects = i915_gem_inactive_scan;
4698 dev_priv->mm.inactive_shrinker.count_objects = i915_gem_inactive_count;
4699 dev_priv->mm.inactive_shrinker.seeks = DEFAULT_SEEKS;
4700 register_shrinker(&dev_priv->mm.inactive_shrinker);
4704 * Create a physically contiguous memory object for this object
4705 * e.g. for cursor + overlay regs
4707 static int i915_gem_init_phys_object(struct drm_device *dev,
4708 int id, int size, int align)
4710 drm_i915_private_t *dev_priv = dev->dev_private;
4711 struct drm_i915_gem_phys_object *phys_obj;
4714 if (dev_priv->mm.phys_objs[id - 1] || !size)
4717 phys_obj = kzalloc(sizeof(*phys_obj), GFP_KERNEL);
4723 phys_obj->handle = drm_pci_alloc(dev, size, align);
4724 if (!phys_obj->handle) {
4729 set_memory_wc((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
4732 dev_priv->mm.phys_objs[id - 1] = phys_obj;
4740 static void i915_gem_free_phys_object(struct drm_device *dev, int id)
4742 drm_i915_private_t *dev_priv = dev->dev_private;
4743 struct drm_i915_gem_phys_object *phys_obj;
4745 if (!dev_priv->mm.phys_objs[id - 1])
4748 phys_obj = dev_priv->mm.phys_objs[id - 1];
4749 if (phys_obj->cur_obj) {
4750 i915_gem_detach_phys_object(dev, phys_obj->cur_obj);
4754 set_memory_wb((unsigned long)phys_obj->handle->vaddr, phys_obj->handle->size / PAGE_SIZE);
4756 drm_pci_free(dev, phys_obj->handle);
4758 dev_priv->mm.phys_objs[id - 1] = NULL;
4761 void i915_gem_free_all_phys_object(struct drm_device *dev)
4765 for (i = I915_GEM_PHYS_CURSOR_0; i <= I915_MAX_PHYS_OBJECT; i++)
4766 i915_gem_free_phys_object(dev, i);
4769 void i915_gem_detach_phys_object(struct drm_device *dev,
4770 struct drm_i915_gem_object *obj)
4772 struct address_space *mapping = file_inode(obj->base.filp)->i_mapping;
4779 vaddr = obj->phys_obj->handle->vaddr;
4781 page_count = obj->base.size / PAGE_SIZE;
4782 for (i = 0; i < page_count; i++) {
4783 struct page *page = shmem_read_mapping_page(mapping, i);
4784 if (!IS_ERR(page)) {
4785 char *dst = kmap_atomic(page);
4786 memcpy(dst, vaddr + i*PAGE_SIZE, PAGE_SIZE);
4789 drm_clflush_pages(&page, 1);
4791 set_page_dirty(page);
4792 mark_page_accessed(page);
4793 page_cache_release(page);
4796 i915_gem_chipset_flush(dev);
4798 obj->phys_obj->cur_obj = NULL;
4799 obj->phys_obj = NULL;
4803 i915_gem_attach_phys_object(struct drm_device *dev,
4804 struct drm_i915_gem_object *obj,
4808 struct address_space *mapping = file_inode(obj->base.filp)->i_mapping;
4809 drm_i915_private_t *dev_priv = dev->dev_private;
4814 if (id > I915_MAX_PHYS_OBJECT)
4817 if (obj->phys_obj) {
4818 if (obj->phys_obj->id == id)
4820 i915_gem_detach_phys_object(dev, obj);
4823 /* create a new object */
4824 if (!dev_priv->mm.phys_objs[id - 1]) {
4825 ret = i915_gem_init_phys_object(dev, id,
4826 obj->base.size, align);
4828 DRM_ERROR("failed to init phys object %d size: %zu\n",
4829 id, obj->base.size);
4834 /* bind to the object */
4835 obj->phys_obj = dev_priv->mm.phys_objs[id - 1];
4836 obj->phys_obj->cur_obj = obj;
4838 page_count = obj->base.size / PAGE_SIZE;
4840 for (i = 0; i < page_count; i++) {
4844 page = shmem_read_mapping_page(mapping, i);
4846 return PTR_ERR(page);
4848 src = kmap_atomic(page);
4849 dst = obj->phys_obj->handle->vaddr + (i * PAGE_SIZE);
4850 memcpy(dst, src, PAGE_SIZE);
4853 mark_page_accessed(page);
4854 page_cache_release(page);
4861 i915_gem_phys_pwrite(struct drm_device *dev,
4862 struct drm_i915_gem_object *obj,
4863 struct drm_i915_gem_pwrite *args,
4864 struct drm_file *file_priv)
4866 void *vaddr = obj->phys_obj->handle->vaddr + args->offset;
4867 char __user *user_data = to_user_ptr(args->data_ptr);
4869 if (__copy_from_user_inatomic_nocache(vaddr, user_data, args->size)) {
4870 unsigned long unwritten;
4872 /* The physical object once assigned is fixed for the lifetime
4873 * of the obj, so we can safely drop the lock and continue
4876 mutex_unlock(&dev->struct_mutex);
4877 unwritten = copy_from_user(vaddr, user_data, args->size);
4878 mutex_lock(&dev->struct_mutex);
4883 i915_gem_chipset_flush(dev);
4887 void i915_gem_release(struct drm_device *dev, struct drm_file *file)
4889 struct drm_i915_file_private *file_priv = file->driver_priv;
4891 cancel_delayed_work_sync(&file_priv->mm.idle_work);
4893 /* Clean up our request list when the client is going away, so that
4894 * later retire_requests won't dereference our soon-to-be-gone
4897 spin_lock(&file_priv->mm.lock);
4898 while (!list_empty(&file_priv->mm.request_list)) {
4899 struct drm_i915_gem_request *request;
4901 request = list_first_entry(&file_priv->mm.request_list,
4902 struct drm_i915_gem_request,
4904 list_del(&request->client_list);
4905 request->file_priv = NULL;
4907 spin_unlock(&file_priv->mm.lock);
4911 i915_gem_file_idle_work_handler(struct work_struct *work)
4913 struct drm_i915_file_private *file_priv =
4914 container_of(work, typeof(*file_priv), mm.idle_work.work);
4916 atomic_set(&file_priv->rps_wait_boost, false);
4919 int i915_gem_open(struct drm_device *dev, struct drm_file *file)
4921 struct drm_i915_file_private *file_priv;
4924 DRM_DEBUG_DRIVER("\n");
4926 file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL);
4930 file->driver_priv = file_priv;
4931 file_priv->dev_priv = dev->dev_private;
4933 spin_lock_init(&file_priv->mm.lock);
4934 INIT_LIST_HEAD(&file_priv->mm.request_list);
4935 INIT_DELAYED_WORK(&file_priv->mm.idle_work,
4936 i915_gem_file_idle_work_handler);
4938 ret = i915_gem_context_open(dev, file);
4945 static bool mutex_is_locked_by(struct mutex *mutex, struct task_struct *task)
4947 if (!mutex_is_locked(mutex))
4950 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_MUTEXES)
4951 return mutex->owner == task;
4953 /* Since UP may be pre-empted, we cannot assume that we own the lock */
4958 static unsigned long
4959 i915_gem_inactive_count(struct shrinker *shrinker, struct shrink_control *sc)
4961 struct drm_i915_private *dev_priv =
4962 container_of(shrinker,
4963 struct drm_i915_private,
4964 mm.inactive_shrinker);
4965 struct drm_device *dev = dev_priv->dev;
4966 struct drm_i915_gem_object *obj;
4968 unsigned long count;
4970 if (!mutex_trylock(&dev->struct_mutex)) {
4971 if (!mutex_is_locked_by(&dev->struct_mutex, current))
4974 if (dev_priv->mm.shrinker_no_lock_stealing)
4981 list_for_each_entry(obj, &dev_priv->mm.unbound_list, global_list)
4982 if (obj->pages_pin_count == 0)
4983 count += obj->base.size >> PAGE_SHIFT;
4985 list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list) {
4989 if (!i915_gem_obj_is_pinned(obj) && obj->pages_pin_count == 0)
4990 count += obj->base.size >> PAGE_SHIFT;
4994 mutex_unlock(&dev->struct_mutex);
4999 /* All the new VM stuff */
5000 unsigned long i915_gem_obj_offset(struct drm_i915_gem_object *o,
5001 struct i915_address_space *vm)
5003 struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5004 struct i915_vma *vma;
5006 if (!dev_priv->mm.aliasing_ppgtt ||
5007 vm == &dev_priv->mm.aliasing_ppgtt->base)
5008 vm = &dev_priv->gtt.base;
5010 BUG_ON(list_empty(&o->vma_list));
5011 list_for_each_entry(vma, &o->vma_list, vma_link) {
5013 return vma->node.start;
5019 bool i915_gem_obj_bound(struct drm_i915_gem_object *o,
5020 struct i915_address_space *vm)
5022 struct i915_vma *vma;
5024 list_for_each_entry(vma, &o->vma_list, vma_link)
5025 if (vma->vm == vm && drm_mm_node_allocated(&vma->node))
5031 bool i915_gem_obj_bound_any(struct drm_i915_gem_object *o)
5033 struct i915_vma *vma;
5035 list_for_each_entry(vma, &o->vma_list, vma_link)
5036 if (drm_mm_node_allocated(&vma->node))
5042 unsigned long i915_gem_obj_size(struct drm_i915_gem_object *o,
5043 struct i915_address_space *vm)
5045 struct drm_i915_private *dev_priv = o->base.dev->dev_private;
5046 struct i915_vma *vma;
5048 if (!dev_priv->mm.aliasing_ppgtt ||
5049 vm == &dev_priv->mm.aliasing_ppgtt->base)
5050 vm = &dev_priv->gtt.base;
5052 BUG_ON(list_empty(&o->vma_list));
5054 list_for_each_entry(vma, &o->vma_list, vma_link)
5056 return vma->node.size;
5061 static unsigned long
5062 i915_gem_inactive_scan(struct shrinker *shrinker, struct shrink_control *sc)
5064 struct drm_i915_private *dev_priv =
5065 container_of(shrinker,
5066 struct drm_i915_private,
5067 mm.inactive_shrinker);
5068 struct drm_device *dev = dev_priv->dev;
5069 unsigned long freed;
5072 if (!mutex_trylock(&dev->struct_mutex)) {
5073 if (!mutex_is_locked_by(&dev->struct_mutex, current))
5076 if (dev_priv->mm.shrinker_no_lock_stealing)
5082 freed = i915_gem_purge(dev_priv, sc->nr_to_scan);
5083 if (freed < sc->nr_to_scan)
5084 freed += __i915_gem_shrink(dev_priv,
5085 sc->nr_to_scan - freed,
5087 if (freed < sc->nr_to_scan)
5088 freed += i915_gem_shrink_all(dev_priv);
5091 mutex_unlock(&dev->struct_mutex);
5096 struct i915_vma *i915_gem_obj_to_ggtt(struct drm_i915_gem_object *obj)
5098 struct i915_vma *vma;
5100 if (WARN_ON(list_empty(&obj->vma_list)))
5103 vma = list_first_entry(&obj->vma_list, typeof(*vma), vma_link);
5104 if (vma->vm != obj_to_ggtt(obj))