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>
37 * The function is used to find the firmware data of one
38 * specific PCI device, which is attached to the indicated
39 * PCI bus. For VFs, their firmware data is linked to that
40 * one of PF's bridge. For other devices, their firmware
41 * data is linked to that of their bridge.
43 static struct pci_dn *pci_bus_to_pdn(struct pci_bus *bus)
46 struct device_node *dn;
50 * We probably have virtual bus which doesn't
51 * have associated bridge.
55 if (pci_is_root_bus(pbus) || pbus->self)
62 * Except virtual bus, all PCI buses should
65 dn = pci_bus_to_OF_node(pbus);
66 pdn = dn ? PCI_DN(dn) : NULL;
71 struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
74 struct device_node *dn = NULL;
75 struct pci_dn *parent, *pdn;
76 struct pci_dev *pdev = NULL;
78 /* Fast path: fetch from PCI device */
79 list_for_each_entry(pdev, &bus->devices, bus_list) {
80 if (pdev->devfn == devfn) {
81 if (pdev->dev.archdata.pci_data)
82 return pdev->dev.archdata.pci_data;
84 dn = pci_device_to_OF_node(pdev);
89 /* Fast path: fetch from device node */
90 pdn = dn ? PCI_DN(dn) : NULL;
94 /* Slow path: fetch from firmware data hierarchy */
95 parent = pci_bus_to_pdn(bus);
99 list_for_each_entry(pdn, &parent->child_list, list) {
100 if (pdn->busno == bus->number &&
108 struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
110 struct device_node *dn;
111 struct pci_dn *parent, *pdn;
113 /* Search device directly */
114 if (pdev->dev.archdata.pci_data)
115 return pdev->dev.archdata.pci_data;
117 /* Check device node */
118 dn = pci_device_to_OF_node(pdev);
119 pdn = dn ? PCI_DN(dn) : NULL;
124 * VFs don't have device nodes. We hook their
125 * firmware data to PF's bridge.
127 parent = pci_bus_to_pdn(pdev->bus);
131 list_for_each_entry(pdn, &parent->child_list, list) {
132 if (pdn->busno == pdev->bus->number &&
133 pdn->devfn == pdev->devfn)
140 #ifdef CONFIG_PCI_IOV
141 static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
143 int busno, int devfn)
147 /* Except PHB, we always have the parent */
151 pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
155 pdn->phb = parent->phb;
156 pdn->parent = parent;
159 pdn->vf_index = vf_index;
160 pdn->pe_number = IODA_INVALID_PE;
161 INIT_LIST_HEAD(&pdn->child_list);
162 INIT_LIST_HEAD(&pdn->list);
163 list_add_tail(&pdn->list, &parent->child_list);
169 struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
171 #ifdef CONFIG_PCI_IOV
172 struct pci_dn *parent, *pdn;
175 /* Only support IOV for now */
176 if (!pdev->is_physfn)
177 return pci_get_pdn(pdev);
179 /* Check if VFs have been populated */
180 pdn = pci_get_pdn(pdev);
181 if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
184 pdn->flags |= PCI_DN_FLAG_IOV_VF;
185 parent = pci_bus_to_pdn(pdev->bus);
189 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
190 struct eeh_dev *edev __maybe_unused;
192 pdn = add_one_dev_pci_data(parent, i,
193 pci_iov_virtfn_bus(pdev, i),
194 pci_iov_virtfn_devfn(pdev, i));
196 dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
202 /* Create the EEH device for the VF */
203 edev = eeh_dev_init(pdn);
206 #endif /* CONFIG_EEH */
208 #endif /* CONFIG_PCI_IOV */
210 return pci_get_pdn(pdev);
213 void remove_dev_pci_data(struct pci_dev *pdev)
215 #ifdef CONFIG_PCI_IOV
216 struct pci_dn *parent;
217 struct pci_dn *pdn, *tmp;
221 * VF and VF PE are created/released dynamically, so we need to
222 * bind/unbind them. Otherwise the VF and VF PE would be mismatched
223 * when re-enabling SR-IOV.
225 if (pdev->is_virtfn) {
226 pdn = pci_get_pdn(pdev);
227 pdn->pe_number = IODA_INVALID_PE;
231 /* Only support IOV PF for now */
232 if (!pdev->is_physfn)
235 /* Check if VFs have been populated */
236 pdn = pci_get_pdn(pdev);
237 if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF))
240 pdn->flags &= ~PCI_DN_FLAG_IOV_VF;
241 parent = pci_bus_to_pdn(pdev->bus);
246 * We might introduce flag to pci_dn in future
247 * so that we can release VF's firmware data in
250 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
251 struct eeh_dev *edev __maybe_unused;
253 list_for_each_entry_safe(pdn, tmp,
254 &parent->child_list, list) {
255 if (pdn->busno != pci_iov_virtfn_bus(pdev, i) ||
256 pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
261 * Release EEH state for this VF. The PCI core
262 * has already torn down the pci_dev for this VF, but
263 * we're responsible to removing the eeh_dev since it
264 * has the same lifetime as the pci_dn that spawned it.
266 edev = pdn_to_eeh_dev(pdn);
269 * We allocate pci_dn's for the totalvfs count,
270 * but only only the vfs that were activated
271 * have a configured PE.
274 eeh_rmv_from_parent_pe(edev);
279 #endif /* CONFIG_EEH */
281 if (!list_empty(&pdn->list))
282 list_del(&pdn->list);
287 #endif /* CONFIG_PCI_IOV */
290 struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
291 struct device_node *dn)
293 const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
295 struct device_node *parent;
298 struct eeh_dev *edev;
301 pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
306 pdn->pe_number = IODA_INVALID_PE;
307 regs = of_get_property(dn, "reg", NULL);
309 u32 addr = of_read_number(regs, 1);
311 /* First register entry is addr (00BBSS00) */
312 pdn->busno = (addr >> 16) & 0xff;
313 pdn->devfn = (addr >> 8) & 0xff;
316 /* vendor/device IDs and class code */
317 regs = of_get_property(dn, "vendor-id", NULL);
318 pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
319 regs = of_get_property(dn, "device-id", NULL);
320 pdn->device_id = regs ? of_read_number(regs, 1) : 0;
321 regs = of_get_property(dn, "class-code", NULL);
322 pdn->class_code = regs ? of_read_number(regs, 1) : 0;
324 /* Extended config space */
325 pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
327 /* Create EEH device */
329 edev = eeh_dev_init(pdn);
336 /* Attach to parent node */
337 INIT_LIST_HEAD(&pdn->child_list);
338 INIT_LIST_HEAD(&pdn->list);
339 parent = of_get_parent(dn);
340 pdn->parent = parent ? PCI_DN(parent) : NULL;
343 list_add_tail(&pdn->list, &pdn->parent->child_list);
347 EXPORT_SYMBOL_GPL(pci_add_device_node_info);
349 void pci_remove_device_node_info(struct device_node *dn)
351 struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL;
352 struct device_node *parent;
354 struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
363 WARN_ON(!list_empty(&pdn->child_list));
364 list_del(&pdn->list);
366 parent = of_get_parent(dn);
373 EXPORT_SYMBOL_GPL(pci_remove_device_node_info);
376 * Traverse a device tree stopping each PCI device in the tree.
377 * This is done depth first. As each node is processed, a "pre"
378 * function is called and the children are processed recursively.
380 * The "pre" func returns a value. If non-zero is returned from
381 * the "pre" func, the traversal stops and this value is returned.
382 * This return value is useful when using traverse as a method of
385 * NOTE: we do not run the func for devices that do not appear to
386 * be PCI except for the start node which we assume (this is good
387 * because the start node is often a phb which may be missing PCI
389 * We use the class-code as an indicator. If we run into
390 * one of these nodes we also assume its siblings are non-pci for
393 void *pci_traverse_device_nodes(struct device_node *start,
394 void *(*fn)(struct device_node *, void *),
397 struct device_node *dn, *nextdn;
400 /* We started with a phb, iterate all childs */
401 for (dn = start->child; dn; dn = nextdn) {
402 const __be32 *classp;
406 classp = of_get_property(dn, "class-code", NULL);
408 class = of_read_number(classp, 1);
416 /* If we are a PCI bridge, go down */
417 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
418 (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
419 /* Depth first...do children */
421 else if (dn->sibling)
422 /* ok, try next sibling instead. */
423 nextdn = dn->sibling;
425 /* Walk up to next valid sibling. */
430 } while (dn->sibling == NULL);
431 nextdn = dn->sibling;
436 EXPORT_SYMBOL_GPL(pci_traverse_device_nodes);
438 static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
441 struct list_head *next = pdn->child_list.next;
443 if (next != &pdn->child_list)
444 return list_entry(next, struct pci_dn, list);
450 next = pdn->list.next;
451 if (next != &pdn->parent->child_list)
457 return list_entry(next, struct pci_dn, list);
460 void *traverse_pci_dn(struct pci_dn *root,
461 void *(*fn)(struct pci_dn *, void *),
464 struct pci_dn *pdn = root;
467 /* Only scan the child nodes */
468 for (pdn = pci_dn_next_one(root, pdn); pdn;
469 pdn = pci_dn_next_one(root, pdn)) {
478 static void *add_pdn(struct device_node *dn, void *data)
480 struct pci_controller *hose = data;
483 pdn = pci_add_device_node_info(hose, dn);
485 return ERR_PTR(-ENOMEM);
491 * pci_devs_phb_init_dynamic - setup pci devices under this PHB
492 * phb: pci-to-host bridge (top-level bridge connecting to cpu)
494 * This routine is called both during boot, (before the memory
495 * subsystem is set up, before kmalloc is valid) and during the
496 * dynamic lpar operation of adding a PHB to a running system.
498 void pci_devs_phb_init_dynamic(struct pci_controller *phb)
500 struct device_node *dn = phb->dn;
503 /* PHB nodes themselves must not match */
504 pdn = pci_add_device_node_info(phb, dn);
506 pdn->devfn = pdn->busno = -1;
507 pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
512 /* Update dn->phb ptrs for new phb and children devices */
513 pci_traverse_device_nodes(dn, add_pdn, phb);
517 * pci_devs_phb_init - Initialize phbs and pci devs under them.
519 * This routine walks over all phb's (pci-host bridges) on the
520 * system, and sets up assorted pci-related structures
521 * (including pci info in the device node structs) for each
522 * pci device found underneath. This routine runs once,
523 * early in the boot sequence.
525 static int __init pci_devs_phb_init(void)
527 struct pci_controller *phb, *tmp;
529 /* This must be done first so the device nodes have valid pci info! */
530 list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
531 pci_devs_phb_init_dynamic(phb);
536 core_initcall(pci_devs_phb_init);
538 static void pci_dev_pdn_setup(struct pci_dev *pdev)
542 if (pdev->dev.archdata.pci_data)
545 /* Setup the fast path */
546 pdn = pci_get_pdn(pdev);
547 pdev->dev.archdata.pci_data = pdn;
549 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);