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Linux/arch/powerpc/kernel/pci_dn.c

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  1 /*
  2  * pci_dn.c
  3  *
  4  * Copyright (C) 2001 Todd Inglett, IBM Corporation
  5  *
  6  * PCI manipulation via device_nodes.
  7  *
  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.
 12  *    
 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.
 17  * 
 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
 21  */
 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>
 28 
 29 #include <asm/io.h>
 30 #include <asm/prom.h>
 31 #include <asm/pci-bridge.h>
 32 #include <asm/ppc-pci.h>
 33 #include <asm/firmware.h>
 34 
 35 /*
 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.
 41  */
 42 static struct pci_dn *pci_bus_to_pdn(struct pci_bus *bus)
 43 {
 44         struct pci_bus *pbus;
 45         struct device_node *dn;
 46         struct pci_dn *pdn;
 47 
 48         /*
 49          * We probably have virtual bus which doesn't
 50          * have associated bridge.
 51          */
 52         pbus = bus;
 53         while (pbus) {
 54                 if (pci_is_root_bus(pbus) || pbus->self)
 55                         break;
 56 
 57                 pbus = pbus->parent;
 58         }
 59 
 60         /*
 61          * Except virtual bus, all PCI buses should
 62          * have device nodes.
 63          */
 64         dn = pci_bus_to_OF_node(pbus);
 65         pdn = dn ? PCI_DN(dn) : NULL;
 66 
 67         return pdn;
 68 }
 69 
 70 struct pci_dn *pci_get_pdn_by_devfn(struct pci_bus *bus,
 71                                     int devfn)
 72 {
 73         struct device_node *dn = NULL;
 74         struct pci_dn *parent, *pdn;
 75         struct pci_dev *pdev = NULL;
 76 
 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;
 82 
 83                         dn = pci_device_to_OF_node(pdev);
 84                         break;
 85                 }
 86         }
 87 
 88         /* Fast path: fetch from device node */
 89         pdn = dn ? PCI_DN(dn) : NULL;
 90         if (pdn)
 91                 return pdn;
 92 
 93         /* Slow path: fetch from firmware data hierarchy */
 94         parent = pci_bus_to_pdn(bus);
 95         if (!parent)
 96                 return NULL;
 97 
 98         list_for_each_entry(pdn, &parent->child_list, list) {
 99                 if (pdn->busno == bus->number &&
100                     pdn->devfn == devfn)
101                         return pdn;
102         }
103 
104         return NULL;
105 }
106 
107 struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
108 {
109         struct device_node *dn;
110         struct pci_dn *parent, *pdn;
111 
112         /* Search device directly */
113         if (pdev->dev.archdata.pci_data)
114                 return pdev->dev.archdata.pci_data;
115 
116         /* Check device node */
117         dn = pci_device_to_OF_node(pdev);
118         pdn = dn ? PCI_DN(dn) : NULL;
119         if (pdn)
120                 return pdn;
121 
122         /*
123          * VFs don't have device nodes. We hook their
124          * firmware data to PF's bridge.
125          */
126         parent = pci_bus_to_pdn(pdev->bus);
127         if (!parent)
128                 return NULL;
129 
130         list_for_each_entry(pdn, &parent->child_list, list) {
131                 if (pdn->busno == pdev->bus->number &&
132                     pdn->devfn == pdev->devfn)
133                         return pdn;
134         }
135 
136         return NULL;
137 }
138 
139 #ifdef CONFIG_PCI_IOV
140 static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
141                                            struct pci_dev *pdev,
142                                            int busno, int devfn)
143 {
144         struct pci_dn *pdn;
145 
146         /* Except PHB, we always have the parent */
147         if (!parent)
148                 return NULL;
149 
150         pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
151         if (!pdn) {
152                 dev_warn(&pdev->dev, "%s: Out of memory!\n", __func__);
153                 return NULL;
154         }
155 
156         pdn->phb = parent->phb;
157         pdn->parent = parent;
158         pdn->busno = busno;
159         pdn->devfn = devfn;
160 #ifdef CONFIG_PPC_POWERNV
161         pdn->pe_number = IODA_INVALID_PE;
162 #endif
163         INIT_LIST_HEAD(&pdn->child_list);
164         INIT_LIST_HEAD(&pdn->list);
165         list_add_tail(&pdn->list, &parent->child_list);
166 
167         /*
168          * If we already have PCI device instance, lets
169          * bind them.
170          */
171         if (pdev)
172                 pdev->dev.archdata.pci_data = pdn;
173 
174         return pdn;
175 }
176 #endif
177 
178 struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
179 {
180 #ifdef CONFIG_PCI_IOV
181         struct pci_dn *parent, *pdn;
182         int i;
183 
184         /* Only support IOV for now */
185         if (!pdev->is_physfn)
186                 return pci_get_pdn(pdev);
187 
188         /* Check if VFs have been populated */
189         pdn = pci_get_pdn(pdev);
190         if (!pdn || (pdn->flags & PCI_DN_FLAG_IOV_VF))
191                 return NULL;
192 
193         pdn->flags |= PCI_DN_FLAG_IOV_VF;
194         parent = pci_bus_to_pdn(pdev->bus);
195         if (!parent)
196                 return NULL;
197 
198         for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
199                 pdn = add_one_dev_pci_data(parent, NULL,
200                                            pci_iov_virtfn_bus(pdev, i),
201                                            pci_iov_virtfn_devfn(pdev, i));
202                 if (!pdn) {
203                         dev_warn(&pdev->dev, "%s: Cannot create firmware data for VF#%d\n",
204                                  __func__, i);
205                         return NULL;
206                 }
207         }
208 #endif /* CONFIG_PCI_IOV */
209 
210         return pci_get_pdn(pdev);
211 }
212 
213 void remove_dev_pci_data(struct pci_dev *pdev)
214 {
215 #ifdef CONFIG_PCI_IOV
216         struct pci_dn *parent;
217         struct pci_dn *pdn, *tmp;
218         int i;
219 
220         /*
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.
224          */
225         if (pdev->is_virtfn) {
226                 pdn = pci_get_pdn(pdev);
227 #ifdef CONFIG_PPC_POWERNV
228                 pdn->pe_number = IODA_INVALID_PE;
229 #endif
230                 return;
231         }
232 
233         /* Only support IOV PF for now */
234         if (!pdev->is_physfn)
235                 return;
236 
237         /* Check if VFs have been populated */
238         pdn = pci_get_pdn(pdev);
239         if (!pdn || !(pdn->flags & PCI_DN_FLAG_IOV_VF))
240                 return;
241 
242         pdn->flags &= ~PCI_DN_FLAG_IOV_VF;
243         parent = pci_bus_to_pdn(pdev->bus);
244         if (!parent)
245                 return;
246 
247         /*
248          * We might introduce flag to pci_dn in future
249          * so that we can release VF's firmware data in
250          * a batch mode.
251          */
252         for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
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))
257                                 continue;
258 
259                         if (!list_empty(&pdn->list))
260                                 list_del(&pdn->list);
261 
262                         kfree(pdn);
263                 }
264         }
265 #endif /* CONFIG_PCI_IOV */
266 }
267 
268 /*
269  * Traverse_func that inits the PCI fields of the device node.
270  * NOTE: this *must* be done before read/write config to the device.
271  */
272 void *update_dn_pci_info(struct device_node *dn, void *data)
273 {
274         struct pci_controller *phb = data;
275         const __be32 *type = of_get_property(dn, "ibm,pci-config-space-type", NULL);
276         const __be32 *regs;
277         struct device_node *parent;
278         struct pci_dn *pdn;
279 
280         pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
281         if (pdn == NULL)
282                 return NULL;
283         dn->data = pdn;
284         pdn->node = dn;
285         pdn->phb = phb;
286 #ifdef CONFIG_PPC_POWERNV
287         pdn->pe_number = IODA_INVALID_PE;
288 #endif
289         regs = of_get_property(dn, "reg", NULL);
290         if (regs) {
291                 u32 addr = of_read_number(regs, 1);
292 
293                 /* First register entry is addr (00BBSS00)  */
294                 pdn->busno = (addr >> 16) & 0xff;
295                 pdn->devfn = (addr >> 8) & 0xff;
296         }
297 
298         /* vendor/device IDs and class code */
299         regs = of_get_property(dn, "vendor-id", NULL);
300         pdn->vendor_id = regs ? of_read_number(regs, 1) : 0;
301         regs = of_get_property(dn, "device-id", NULL);
302         pdn->device_id = regs ? of_read_number(regs, 1) : 0;
303         regs = of_get_property(dn, "class-code", NULL);
304         pdn->class_code = regs ? of_read_number(regs, 1) : 0;
305 
306         /* Extended config space */
307         pdn->pci_ext_config_space = (type && of_read_number(type, 1) == 1);
308 
309         /* Attach to parent node */
310         INIT_LIST_HEAD(&pdn->child_list);
311         INIT_LIST_HEAD(&pdn->list);
312         parent = of_get_parent(dn);
313         pdn->parent = parent ? PCI_DN(parent) : NULL;
314         if (pdn->parent)
315                 list_add_tail(&pdn->list, &pdn->parent->child_list);
316 
317         return NULL;
318 }
319 
320 /*
321  * Traverse a device tree stopping each PCI device in the tree.
322  * This is done depth first.  As each node is processed, a "pre"
323  * function is called and the children are processed recursively.
324  *
325  * The "pre" func returns a value.  If non-zero is returned from
326  * the "pre" func, the traversal stops and this value is returned.
327  * This return value is useful when using traverse as a method of
328  * finding a device.
329  *
330  * NOTE: we do not run the func for devices that do not appear to
331  * be PCI except for the start node which we assume (this is good
332  * because the start node is often a phb which may be missing PCI
333  * properties).
334  * We use the class-code as an indicator. If we run into
335  * one of these nodes we also assume its siblings are non-pci for
336  * performance.
337  */
338 void *traverse_pci_devices(struct device_node *start, traverse_func pre,
339                 void *data)
340 {
341         struct device_node *dn, *nextdn;
342         void *ret;
343 
344         /* We started with a phb, iterate all childs */
345         for (dn = start->child; dn; dn = nextdn) {
346                 const __be32 *classp;
347                 u32 class = 0;
348 
349                 nextdn = NULL;
350                 classp = of_get_property(dn, "class-code", NULL);
351                 if (classp)
352                         class = of_read_number(classp, 1);
353 
354                 if (pre && ((ret = pre(dn, data)) != NULL))
355                         return ret;
356 
357                 /* If we are a PCI bridge, go down */
358                 if (dn->child && ((class >> 8) == PCI_CLASS_BRIDGE_PCI ||
359                                   (class >> 8) == PCI_CLASS_BRIDGE_CARDBUS))
360                         /* Depth first...do children */
361                         nextdn = dn->child;
362                 else if (dn->sibling)
363                         /* ok, try next sibling instead. */
364                         nextdn = dn->sibling;
365                 if (!nextdn) {
366                         /* Walk up to next valid sibling. */
367                         do {
368                                 dn = dn->parent;
369                                 if (dn == start)
370                                         return NULL;
371                         } while (dn->sibling == NULL);
372                         nextdn = dn->sibling;
373                 }
374         }
375         return NULL;
376 }
377 
378 static struct pci_dn *pci_dn_next_one(struct pci_dn *root,
379                                       struct pci_dn *pdn)
380 {
381         struct list_head *next = pdn->child_list.next;
382 
383         if (next != &pdn->child_list)
384                 return list_entry(next, struct pci_dn, list);
385 
386         while (1) {
387                 if (pdn == root)
388                         return NULL;
389 
390                 next = pdn->list.next;
391                 if (next != &pdn->parent->child_list)
392                         break;
393 
394                 pdn = pdn->parent;
395         }
396 
397         return list_entry(next, struct pci_dn, list);
398 }
399 
400 void *traverse_pci_dn(struct pci_dn *root,
401                       void *(*fn)(struct pci_dn *, void *),
402                       void *data)
403 {
404         struct pci_dn *pdn = root;
405         void *ret;
406 
407         /* Only scan the child nodes */
408         for (pdn = pci_dn_next_one(root, pdn); pdn;
409              pdn = pci_dn_next_one(root, pdn)) {
410                 ret = fn(pdn, data);
411                 if (ret)
412                         return ret;
413         }
414 
415         return NULL;
416 }
417 
418 /** 
419  * pci_devs_phb_init_dynamic - setup pci devices under this PHB
420  * phb: pci-to-host bridge (top-level bridge connecting to cpu)
421  *
422  * This routine is called both during boot, (before the memory
423  * subsystem is set up, before kmalloc is valid) and during the 
424  * dynamic lpar operation of adding a PHB to a running system.
425  */
426 void pci_devs_phb_init_dynamic(struct pci_controller *phb)
427 {
428         struct device_node *dn = phb->dn;
429         struct pci_dn *pdn;
430 
431         /* PHB nodes themselves must not match */
432         update_dn_pci_info(dn, phb);
433         pdn = dn->data;
434         if (pdn) {
435                 pdn->devfn = pdn->busno = -1;
436                 pdn->vendor_id = pdn->device_id = pdn->class_code = 0;
437                 pdn->phb = phb;
438                 phb->pci_data = pdn;
439         }
440 
441         /* Update dn->phb ptrs for new phb and children devices */
442         traverse_pci_devices(dn, update_dn_pci_info, phb);
443 }
444 
445 /** 
446  * pci_devs_phb_init - Initialize phbs and pci devs under them.
447  * 
448  * This routine walks over all phb's (pci-host bridges) on the
449  * system, and sets up assorted pci-related structures 
450  * (including pci info in the device node structs) for each
451  * pci device found underneath.  This routine runs once,
452  * early in the boot sequence.
453  */
454 void __init pci_devs_phb_init(void)
455 {
456         struct pci_controller *phb, *tmp;
457 
458         /* This must be done first so the device nodes have valid pci info! */
459         list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
460                 pci_devs_phb_init_dynamic(phb);
461 }
462 
463 static void pci_dev_pdn_setup(struct pci_dev *pdev)
464 {
465         struct pci_dn *pdn;
466 
467         if (pdev->dev.archdata.pci_data)
468                 return;
469 
470         /* Setup the fast path */
471         pdn = pci_get_pdn(pdev);
472         pdev->dev.archdata.pci_data = pdn;
473 }
474 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);
475 

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