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
);