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 #ifdef CONFIG_PPC_POWERNV
160 pdn->vf_index = vf_index;
161 pdn->pe_number = IODA_INVALID_PE;
163 INIT_LIST_HEAD(&pdn->child_list);
164 INIT_LIST_HEAD(&pdn->list);
165 list_add_tail(&pdn->list, &parent->child_list);
171 struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
173 #ifdef CONFIG_PCI_IOV
174 struct pci_dn *parent, *pdn;
177 /* Only support IOV for now */
178 if (!pdev->is_physfn)
179 return pci_get_pdn(pdev);
181 /* Check if VFs have been populated */
182 pdn = pci_get_pdn(pdev);
183 if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
186 pdn->flags |= PCI_DN_FLAG_IOV_VF;
187 parent = pci_bus_to_pdn(pdev->bus);
191 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
192 struct eeh_dev *edev __maybe_unused;
194 pdn = add_one_dev_pci_data(parent, i,
195 pci_iov_virtfn_bus(pdev, i),
196 pci_iov_virtfn_devfn(pdev, i));
198 dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
204 /* Create the EEH device for the VF */
205 edev = eeh_dev_init(pdn);
208 #endif /* CONFIG_EEH */
210 #endif /* CONFIG_PCI_IOV */
212 return pci_get_pdn(pdev);
215 void remove_dev_pci_data(struct pci_dev *pdev)
217 #ifdef CONFIG_PCI_IOV
218 struct pci_dn *parent;
219 struct pci_dn *pdn, *tmp;
223 * VF and VF PE are created/released dynamically, so we need to
224 * bind/unbind them. Otherwise the VF and VF PE would be mismatched
225 * when re-enabling SR-IOV.
227 if (pdev->is_virtfn) {
228 pdn = pci_get_pdn(pdev);
229 #ifdef CONFIG_PPC_POWERNV
230 pdn->pe_number = IODA_INVALID_PE;
235 /* Only support IOV PF for now */
236 if (!pdev->is_physfn)
239 /* Check if VFs have been populated */
240 pdn = pci_get_pdn(pdev);
241 if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF))
244 pdn->flags &= ~PCI_DN_FLAG_IOV_VF;
245 parent = pci_bus_to_pdn(pdev->bus);
250 * We might introduce flag to pci_dn in future
251 * so that we can release VF's firmware data in
254 for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
255 struct eeh_dev *edev __maybe_unused;
257 list_for_each_entry_safe(pdn, tmp,
258 &parent->child_list, list) {
259 if (pdn->busno != pci_iov_virtfn_bus(pdev, i) ||
260 pdn->devfn != pci_iov_virtfn_devfn(pdev, i))
265 * Release EEH state for this VF. The PCI core
266 * has already torn down the pci_dev for this VF, but
267 * we're responsible to removing the eeh_dev since it
268 * has the same lifetime as the pci_dn that spawned it.
270 edev = pdn_to_eeh_dev(pdn);
273 * We allocate pci_dn's for the totalvfs count,
274 * but only only the vfs that were activated
275 * have a configured PE.
278 eeh_rmv_from_parent_pe(edev);
283 #endif /* CONFIG_EEH */
285 if (!list_empty(&pdn->list))
286 list_del(&pdn->list);
291 #endif /* CONFIG_PCI_IOV */
294 struct pci_dn *pci_add_device_node_info(struct pci_controller *hose,
295 struct device_node *dn)
297 const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
299 struct device_node *parent;
302 struct eeh_dev *edev;
305 pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
310 #ifdef CONFIG_PPC_POWERNV
311 pdn->pe_number = IODA_INVALID_PE;
313 regs = of_get_property(dn, "reg", NULL);
315 u32 addr = of_read_number(regs, 1);
317 /* First register entry is addr (00BBSS00) */
318 pdn->busno = (addr >> 16) & 0xff;
319 pdn->devfn = (addr >> 8) & 0xff;
322 /* vendor/device IDs and class code */
323 regs = of_get_property(dn, "vendor-id", NULL);
324 pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
325 regs = of_get_property(dn, "device-id", NULL);
326 pdn->device_id = regs ? of_read_number(regs, 1) : 0;
327 regs = of_get_property(dn, "class-code", NULL);
328 pdn->class_code = regs ? of_read_number(regs, 1) : 0;
330 /* Extended config space */
331 pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
333 /* Create EEH device */
335 edev = eeh_dev_init(pdn);
342 /* Attach to parent node */
343 INIT_LIST_HEAD(&pdn->child_list);
344 INIT_LIST_HEAD(&pdn->list);
345 parent = of_get_parent(dn);
346 pdn->parent = parent ? PCI_DN(parent) : NULL;
348 list_add_tail(&pdn->list, &pdn->parent->child_list);
352 EXPORT_SYMBOL_GPL(pci_add_device_node_info);
354 void pci_remove_device_node_info(struct device_node *dn)
356 struct pci_dn *pdn = dn ? PCI_DN(dn) : NULL;
357 struct device_node *parent;
359 struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
368 WARN_ON(!list_empty(&pdn->child_list));
369 list_del(&pdn->list);
371 parent = of_get_parent(dn);
378 EXPORT_SYMBOL_GPL(pci_remove_device_node_info);
381 * Traverse a device tree stopping each PCI device in the tree.
382 * This is done depth first. As each node is processed, a "pre"
383 * function is called and the children are processed recursively.
385 * The "pre" func returns a value. If non-zero is returned from
386 * the "pre" func, the traversal stops and this value is returned.
387 * This return value is useful when using traverse as a method of
390 * NOTE: we do not run the func for devices that do not appear to
391 * be PCI except for the start node which we assume (this is good
392 * because the start node is often a phb which may be missing PCI
394 * We use the class-code as an indicator. If we run into
395 * one of these nodes we also assume its siblings are non-pci for
398 void *pci_traverse_device_nodes(struct device_node *start,
399 void *(*fn)(struct device_node *, void *),
402 struct device_node *dn, *nextdn;
405 /* We started with a phb, iterate all childs */
406 for (dn = start->child; dn; dn = nextdn) {
407 const __be32 *classp;
411 classp = of_get_property(dn, "class-code", NULL);
413 class = of_read_number(classp, 1);
421 /* If we are a PCI bridge, go down */
422 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
423 (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
424 /* Depth first...do children */
426 else if (dn->sibling)
427 /* ok, try next sibling instead. */
428 nextdn = dn->sibling;
430 /* Walk up to next valid sibling. */
435 } while (dn->sibling == NULL);
436 nextdn = dn->sibling;
441 EXPORT_SYMBOL_GPL(pci_traverse_device_nodes);
443 static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
446 struct list_head *next = pdn->child_list.next;
448 if (next != &pdn->child_list)
449 return list_entry(next, struct pci_dn, list);
455 next = pdn->list.next;
456 if (next != &pdn->parent->child_list)
462 return list_entry(next, struct pci_dn, list);
465 void *traverse_pci_dn(struct pci_dn *root,
466 void *(*fn)(struct pci_dn *, void *),
469 struct pci_dn *pdn = root;
472 /* Only scan the child nodes */
473 for (pdn = pci_dn_next_one(root, pdn); pdn;
474 pdn = pci_dn_next_one(root, pdn)) {
483 static void *add_pdn(struct device_node *dn, void *data)
485 struct pci_controller *hose = data;
488 pdn = pci_add_device_node_info(hose, dn);
490 return ERR_PTR(-ENOMEM);
496 * pci_devs_phb_init_dynamic - setup pci devices under this PHB
497 * phb: pci-to-host bridge (top-level bridge connecting to cpu)
499 * This routine is called both during boot, (before the memory
500 * subsystem is set up, before kmalloc is valid) and during the
501 * dynamic lpar operation of adding a PHB to a running system.
503 void pci_devs_phb_init_dynamic(struct pci_controller *phb)
505 struct device_node *dn = phb->dn;
508 /* PHB nodes themselves must not match */
509 pdn = pci_add_device_node_info(phb, dn);
511 pdn->devfn = pdn->busno = -1;
512 pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
517 /* Update dn->phb ptrs for new phb and children devices */
518 pci_traverse_device_nodes(dn, add_pdn, phb);
522 * pci_devs_phb_init - Initialize phbs and pci devs under them.
524 * This routine walks over all phb's (pci-host bridges) on the
525 * system, and sets up assorted pci-related structures
526 * (including pci info in the device node structs) for each
527 * pci device found underneath. This routine runs once,
528 * early in the boot sequence.
530 static int __init pci_devs_phb_init(void)
532 struct pci_controller *phb, *tmp;
534 /* This must be done first so the device nodes have valid pci info! */
535 list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
536 pci_devs_phb_init_dynamic(phb);
541 core_initcall(pci_devs_phb_init);
543 static void pci_dev_pdn_setup(struct pci_dev *pdev)
547 if (pdev->dev.archdata.pci_data)
550 /* Setup the fast path */
551 pdn = pci_get_pdn(pdev);
552 pdev->dev.archdata.pci_data = pdn;
554 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);