4 * Copyright (C) 2001 Todd Inglett, IBM Corporation
6 * PCI manipulation via device_nodes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/kernel.h>
23 #include <linux/pci.h>
24 #include <linux/string.h>
25 #include <linux/export.h>
26 #include <linux/init.h>
27 #include <linux/gfp.h>
31 #include <asm/pci-bridge.h>
32 #include <asm/ppc-pci.h>
33 #include <asm/firmware.h>
36 * The function is used to find the firmware data of one
37 * specific PCI device, which is attached to the indicated
38 * PCI bus. For VFs, their firmware data is linked to that
39 * one of PF's bridge. For other devices, their firmware
40 * data is linked to that of their bridge.
42 static struct pci_dn *pci_bus_to_pdn(struct pci_bus *bus)
45 struct device_node *dn;
49 * We probably have virtual bus which doesn't
50 * have associated bridge.
54 if (pci_is_root_bus(pbus) || pbus->self)
61 * Except virtual bus, all PCI buses should
64 dn = pci_bus_to_OF_node(pbus);
65 pdn = dn ? PCI_DN(dn) : NULL;
70 struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
73 struct device_node *dn = NULL;
74 struct pci_dn *parent, *pdn;
75 struct pci_dev *pdev = NULL;
77 /* Fast path: fetch from PCI device */
78 list_for_each_entry(pdev, &bus->devices, bus_list) {
79 if (pdev->devfn == devfn) {
80 if (pdev->dev.archdata.pci_data)
81 return pdev->dev.archdata.pci_data;
83 dn = pci_device_to_OF_node(pdev);
88 /* Fast path: fetch from device node */
89 pdn = dn ? PCI_DN(dn) : NULL;
93 /* Slow path: fetch from firmware data hierarchy */
94 parent = pci_bus_to_pdn(bus);
98 list_for_each_entry(pdn, &parent->child_list, list) {
99 if (pdn->busno == bus->number &&
107 struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
109 struct device_node *dn;
110 struct pci_dn *parent, *pdn;
112 /* Search device directly */
113 if (pdev->dev.archdata.pci_data)
114 return pdev->dev.archdata.pci_data;
116 /* Check device node */
117 dn = pci_device_to_OF_node(pdev);
118 pdn = dn ? PCI_DN(dn) : NULL;
123 * VFs don't have device nodes. We hook their
124 * firmware data to PF's bridge.
126 parent = pci_bus_to_pdn(pdev->bus);
130 list_for_each_entry(pdn, &parent->child_list, list) {
131 if (pdn->busno == pdev->bus->number &&
132 pdn->devfn == pdev->devfn)
139 #ifdef CONFIG_PCI_IOV
140 static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
141 struct pci_dev *pdev,
143 int busno, int devfn)
147 /* Except PHB, we always have the parent */
151 pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
153 dev_warn(&pdev->dev, "%s: Out of memory!\n", __func__);
157 pdn->phb = parent->phb;
158 pdn->parent = parent;
161 #ifdef CONFIG_PPC_POWERNV
162 pdn->vf_index = vf_index;
163 pdn->pe_number = IODA_INVALID_PE;
165 INIT_LIST_HEAD(&pdn->child_list);
166 INIT_LIST_HEAD(&pdn->list);
167 list_add_tail(&pdn->list, &parent->child_list);
170 * If we already have PCI device instance, lets
174 pdev->dev.archdata.pci_data = pdn;
180 struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
182 #ifdef CONFIG_PCI_IOV
183 struct pci_dn *parent, *pdn;
184 struct eeh_dev *edev;
187 /* Only support IOV for now */
188 if (!pdev->is_physfn)
189 return pci_get_pdn(pdev);
191 /* Check if VFs have been populated */
192 pdn = pci_get_pdn(pdev);
193 if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
196 pdn->flags |= PCI_DN_FLAG_IOV_VF;
197 parent = pci_bus_to_pdn(pdev->bus);
201 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
202 pdn = add_one_dev_pci_data(parent, NULL, i,
203 pci_iov_virtfn_bus(pdev, i),
204 pci_iov_virtfn_devfn(pdev, i));
206 dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
211 /* Create the EEH device for the VF */
212 eeh_dev_init(pdn, pci_bus_to_host(pdev->bus));
213 edev = pdn_to_eeh_dev(pdn);
217 #endif /* CONFIG_PCI_IOV */
219 return pci_get_pdn(pdev);
222 void remove_dev_pci_data(struct pci_dev *pdev)
224 #ifdef CONFIG_PCI_IOV
225 struct pci_dn *parent;
226 struct pci_dn *pdn, *tmp;
227 struct eeh_dev *edev;
231 * VF and VF PE are created/released dynamically, so we need to
232 * bind/unbind them. Otherwise the VF and VF PE would be mismatched
233 * when re-enabling SR-IOV.
235 if (pdev->is_virtfn) {
236 pdn = pci_get_pdn(pdev);
237 #ifdef CONFIG_PPC_POWERNV
238 pdn->pe_number = IODA_INVALID_PE;
243 /* Only support IOV PF for now */
244 if (!pdev->is_physfn)
247 /* Check if VFs have been populated */
248 pdn = pci_get_pdn(pdev);
249 if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF))
252 pdn->flags &= ~PCI_DN_FLAG_IOV_VF;
253 parent = pci_bus_to_pdn(pdev->bus);
258 * We might introduce flag to pci_dn in future
259 * so that we can release VF's firmware data in
262 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
263 list_for_each_entry_safe(pdn, tmp,
264 &parent->child_list, list) {
265 if (pdn->busno != pci_iov_virtfn_bus(pdev, i) ||
266 pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
269 /* Release EEH device for the VF */
270 edev = pdn_to_eeh_dev(pdn);
276 if (!list_empty(&pdn->list))
277 list_del(&pdn->list);
282 #endif /* CONFIG_PCI_IOV */
285 struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
286 struct device_node *dn)
288 const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
290 struct device_node *parent;
293 pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
299 #ifdef CONFIG_PPC_POWERNV
300 pdn->pe_number = IODA_INVALID_PE;
302 regs = of_get_property(dn, "reg", NULL);
304 u32 addr = of_read_number(regs, 1);
306 /* First register entry is addr (00BBSS00) */
307 pdn->busno = (addr >> 16) & 0xff;
308 pdn->devfn = (addr >> 8) & 0xff;
311 /* vendor/device IDs and class code */
312 regs = of_get_property(dn, "vendor-id", NULL);
313 pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
314 regs = of_get_property(dn, "device-id", NULL);
315 pdn->device_id = regs ? of_read_number(regs, 1) : 0;
316 regs = of_get_property(dn, "class-code", NULL);
317 pdn->class_code = regs ? of_read_number(regs, 1) : 0;
319 /* Extended config space */
320 pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
322 /* Attach to parent node */
323 INIT_LIST_HEAD(&pdn->child_list);
324 INIT_LIST_HEAD(&pdn->list);
325 parent = of_get_parent(dn);
326 pdn->parent = parent ? PCI_DN(parent) : NULL;
328 list_add_tail(&pdn->list, &pdn->parent->child_list);
332 EXPORT_SYMBOL_GPL(pci_add_device_node_info);
334 void pci_remove_device_node_info(struct device_node *dn)
336 struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL;
338 struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
347 WARN_ON(!list_empty(&pdn->child_list));
348 list_del(&pdn->list);
350 of_node_put(pdn->parent->node);
355 EXPORT_SYMBOL_GPL(pci_remove_device_node_info);
358 * Traverse a device tree stopping each PCI device in the tree.
359 * This is done depth first. As each node is processed, a "pre"
360 * function is called and the children are processed recursively.
362 * The "pre" func returns a value. If non-zero is returned from
363 * the "pre" func, the traversal stops and this value is returned.
364 * This return value is useful when using traverse as a method of
367 * NOTE: we do not run the func for devices that do not appear to
368 * be PCI except for the start node which we assume (this is good
369 * because the start node is often a phb which may be missing PCI
371 * We use the class-code as an indicator. If we run into
372 * one of these nodes we also assume its siblings are non-pci for
375 void *pci_traverse_device_nodes(struct device_node *start,
376 void *(*fn)(struct device_node *, void *),
379 struct device_node *dn, *nextdn;
382 /* We started with a phb, iterate all childs */
383 for (dn = start->child; dn; dn = nextdn) {
384 const __be32 *classp;
388 classp = of_get_property(dn, "class-code", NULL);
390 class = of_read_number(classp, 1);
398 /* If we are a PCI bridge, go down */
399 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
400 (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
401 /* Depth first...do children */
403 else if (dn->sibling)
404 /* ok, try next sibling instead. */
405 nextdn = dn->sibling;
407 /* Walk up to next valid sibling. */
412 } while (dn->sibling == NULL);
413 nextdn = dn->sibling;
418 EXPORT_SYMBOL_GPL(pci_traverse_device_nodes);
420 static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
423 struct list_head *next = pdn->child_list.next;
425 if (next != &pdn->child_list)
426 return list_entry(next, struct pci_dn, list);
432 next = pdn->list.next;
433 if (next != &pdn->parent->child_list)
439 return list_entry(next, struct pci_dn, list);
442 void *traverse_pci_dn(struct pci_dn *root,
443 void *(*fn)(struct pci_dn *, void *),
446 struct pci_dn *pdn = root;
449 /* Only scan the child nodes */
450 for (pdn = pci_dn_next_one(root, pdn); pdn;
451 pdn = pci_dn_next_one(root, pdn)) {
460 static void *add_pdn(struct device_node *dn, void *data)
462 struct pci_controller *hose = data;
465 pdn = pci_add_device_node_info(hose, dn);
467 return ERR_PTR(-ENOMEM);
473 * pci_devs_phb_init_dynamic - setup pci devices under this PHB
474 * phb: pci-to-host bridge (top-level bridge connecting to cpu)
476 * This routine is called both during boot, (before the memory
477 * subsystem is set up, before kmalloc is valid) and during the
478 * dynamic lpar operation of adding a PHB to a running system.
480 void pci_devs_phb_init_dynamic(struct pci_controller *phb)
482 struct device_node *dn = phb->dn;
485 /* PHB nodes themselves must not match */
486 pdn = pci_add_device_node_info(phb, dn);
488 pdn->devfn = pdn->busno = -1;
489 pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
494 /* Update dn->phb ptrs for new phb and children devices */
495 pci_traverse_device_nodes(dn, add_pdn, phb);
499 * pci_devs_phb_init - Initialize phbs and pci devs under them.
501 * This routine walks over all phb's (pci-host bridges) on the
502 * system, and sets up assorted pci-related structures
503 * (including pci info in the device node structs) for each
504 * pci device found underneath. This routine runs once,
505 * early in the boot sequence.
507 void __init pci_devs_phb_init(void)
509 struct pci_controller *phb, *tmp;
511 /* This must be done first so the device nodes have valid pci info! */
512 list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
513 pci_devs_phb_init_dynamic(phb);
516 static void pci_dev_pdn_setup(struct pci_dev *pdev)
520 if (pdev->dev.archdata.pci_data)
523 /* Setup the fast path */
524 pdn = pci_get_pdn(pdev);
525 pdev->dev.archdata.pci_data = pdn;
527 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);