drm/i915: Only use sanitized values for ILK watermarks

The raw watermark values are needed when planes are not part of the state,
but this introduced a regression and possibly an overflow when merging
the watermarks because invalid values may end up used. Solve this by calculating
raw watermarks for all levels, and only setting non-zero values when the level
is valid.

Fixes the SNB warning:
   WARNING: CPU: 1 PID: 25405 at drivers/gpu/drm/i915/intel_pm.c:2580 ilk_program_watermarks+0x7b2/0x9d0 [i915]()
   WARN_ON(wm_lp != 1)
   Modules linked in: i915 drm_kms_helper drm bluetooth fuse iTCO_wdt iTCO_vendor_support syscopyarea sysfillrect sysimgblt fb_sys_fops tpm_tis mei_me e1000e snd_hda_codec_hdmi pcspkr tpm mei i2c_i801 lpc_ich snd_hda_codec snd_hda_core
   CPU: 1 PID: 25405 Comm: kms_universal_p Tainted: G     U  W       4.5.0-rc6apollolake+ #462
   Hardware name:                  /DH67GD, BIOS BLH6710H.86A.0160.2012.1204.1156 12/04/2012
    0000000000000000 ffff88009d42b918 ffffffff8143cfab ffff88009d42b960
    ffffffffa0363580 ffff88009d42b950 ffffffff81082746 ffff8800b9a24928
    ffff88009d42ba00 ffff88009d4a0000 0000000000000000 ffff88009d42ba6c
   Call Trace:
    [<ffffffff8143cfab>] dump_stack+0x4d/0x72
    [<ffffffff81082746>] warn_slowpath_common+0x86/0xc0
    [<ffffffff810827cc>] warn_slowpath_fmt+0x4c/0x50
    [<ffffffffa0292862>] ilk_program_watermarks+0x7b2/0x9d0 [i915]
    [<ffffffffa0292cb7>] ilk_initial_watermarks+0x107/0x120 [i915]
    [<ffffffffa02feffa>] intel_pre_plane_update+0x12a/0x190 [i915]
    [<ffffffffa02ffb36>] intel_atomic_commit+0x546/0xd50 [i915]
    [<ffffffffa012c9e7>] drm_atomic_commit+0x37/0x60 [drm]
    [<ffffffffa0217361>] drm_atomic_helper_disable_plane+0xb1/0xf0 [drm_kms_helper]
    [<ffffffffa011cdb4>] __setplane_internal+0x184/0x280 [drm]
    [<ffffffffa012b57a>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
    [<ffffffffa012010f>] drm_mode_setplane+0x13f/0x1c0 [drm]
    [<ffffffffa0111b52>] drm_ioctl+0x142/0x590 [drm]
    [<ffffffffa011ffd0>] ? drm_plane_check_pixel_format+0x50/0x50 [drm]
    [<ffffffff811f2744>] ? mntput+0x24/0x40
    [<ffffffff811d28d4>] ? __fput+0x194/0x200
    [<ffffffffa012dec3>] drm_compat_ioctl+0x33/0x40 [drm]
    [<ffffffffa029e1c2>] i915_compat_ioctl+0x32/0x40 [i915]
    [<ffffffff81228d72>] compat_SyS_ioctl+0xc2/0x330
    [<ffffffff810021d5>] ? exit_to_usermode_loop+0x95/0xb0
    [<ffffffff81002d2e>] do_fast_syscall_32+0x9e/0x210
    [<ffffffff8197faf2>] entry_SYSENTER_compat+0x52/0x70

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Testcase: kms_universal_plane
Fixes: d81f04c5ef ("drm/i915: Allow preservation of watermarks, v2.")
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/56DEA1FC.8080703@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 3daf1e3..7b2d66d 100644 (file)
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -390,6 +390,7 @@ struct intel_crtc_scaler_state {
 
 struct intel_pipe_wm {
        struct intel_wm_level wm[5];
+       struct intel_wm_level raw_wm[5];
        uint32_t linetime;
        bool fbc_wm_enabled;
        bool pipe_enabled;

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f65e841..d7aef17 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2335,7 +2335,6 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
                         drm_rect_height(&sprstate->dst) != drm_rect_height(&sprstate->src) >> 16);
        }
 
-
        usable_level = max_level;
 
        /* ILK/SNB: LP2+ watermarks only w/o sprites */
@@ -2347,7 +2346,10 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
                usable_level = 0;
 
        ilk_compute_wm_level(dev_priv, intel_crtc, 0, cstate,
-                            pristate, sprstate, curstate, &pipe_wm->wm[0]);
+                            pristate, sprstate, curstate, &pipe_wm->raw_wm[0]);
+
+       memset(&pipe_wm->wm, 0, sizeof(pipe_wm->wm));
+       pipe_wm->wm[0] = pipe_wm->raw_wm[0];
 
        if (IS_HASWELL(dev) || IS_BROADWELL(dev))
                pipe_wm->linetime = hsw_compute_linetime_wm(dev, cstate);
@@ -2358,7 +2360,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
        ilk_compute_wm_reg_maximums(dev, 1, &max);
 
        for (level = 1; level <= max_level; level++) {
-               struct intel_wm_level *wm = &pipe_wm->wm[level];
+               struct intel_wm_level *wm = &pipe_wm->raw_wm[level];
 
                ilk_compute_wm_level(dev_priv, intel_crtc, level, cstate,
                                     pristate, sprstate, curstate, wm);
@@ -2368,12 +2370,13 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
                 * register maximums since such watermarks are
                 * always invalid.
                 */
-               if (level > usable_level) {
-                       wm->enable = false;
-               } else if (!ilk_validate_wm_level(level, &max, wm)) {
-                       wm->enable = false;
+               if (level > usable_level)
+                       continue;
+
+               if (ilk_validate_wm_level(level, &max, wm))
+                       pipe_wm->wm[level] = *wm;
+               else
                        usable_level = level;
-               }
        }
 
        return 0;