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Linux/arch/x86/pci/acpi.c

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  1 #include <linux/pci.h>
  2 #include <linux/acpi.h>
  3 #include <linux/init.h>
  4 #include <linux/irq.h>
  5 #include <linux/dmi.h>
  6 #include <linux/slab.h>
  7 #include <linux/pci-acpi.h>
  8 #include <asm/numa.h>
  9 #include <asm/pci_x86.h>
 10 
 11 struct pci_root_info {
 12         struct acpi_pci_root_info common;
 13         struct pci_sysdata sd;
 14 #ifdef  CONFIG_PCI_MMCONFIG
 15         bool mcfg_added;
 16         u8 start_bus;
 17         u8 end_bus;
 18 #endif
 19 };
 20 
 21 static bool pci_use_crs = true;
 22 static bool pci_ignore_seg = false;
 23 
 24 static int __init set_use_crs(const struct dmi_system_id *id)
 25 {
 26         pci_use_crs = true;
 27         return 0;
 28 }
 29 
 30 static int __init set_nouse_crs(const struct dmi_system_id *id)
 31 {
 32         pci_use_crs = false;
 33         return 0;
 34 }
 35 
 36 static int __init set_ignore_seg(const struct dmi_system_id *id)
 37 {
 38         printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
 39         pci_ignore_seg = true;
 40         return 0;
 41 }
 42 
 43 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
 44         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
 45         {
 46                 .callback = set_use_crs,
 47                 .ident = "IBM System x3800",
 48                 .matches = {
 49                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
 50                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
 51                 },
 52         },
 53         /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
 54         /* 2006 AMD HT/VIA system with two host bridges */
 55         {
 56                 .callback = set_use_crs,
 57                 .ident = "ASRock ALiveSATA2-GLAN",
 58                 .matches = {
 59                         DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
 60                 },
 61         },
 62         /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
 63         /* 2006 AMD HT/VIA system with two host bridges */
 64         {
 65                 .callback = set_use_crs,
 66                 .ident = "ASUS M2V-MX SE",
 67                 .matches = {
 68                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 69                         DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
 70                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
 71                 },
 72         },
 73         /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
 74         {
 75                 .callback = set_use_crs,
 76                 .ident = "MSI MS-7253",
 77                 .matches = {
 78                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
 79                         DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
 80                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
 81                 },
 82         },
 83         /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
 84         /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
 85         {
 86                 .callback = set_use_crs,
 87                 .ident = "Foxconn K8M890-8237A",
 88                 .matches = {
 89                         DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
 90                         DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
 91                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
 92                 },
 93         },
 94 
 95         /* Now for the blacklist.. */
 96 
 97         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
 98         {
 99                 .callback = set_nouse_crs,
100                 .ident = "Dell Studio 1557",
101                 .matches = {
102                         DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
103                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
104                         DMI_MATCH(DMI_BIOS_VERSION, "A09"),
105                 },
106         },
107         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
108         {
109                 .callback = set_nouse_crs,
110                 .ident = "Thinkpad SL510",
111                 .matches = {
112                         DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
113                         DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
114                         DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
115                 },
116         },
117 
118         /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
119         {
120                 .callback = set_ignore_seg,
121                 .ident = "HP xw9300",
122                 .matches = {
123                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
124                         DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
125                 },
126         },
127         {}
128 };
129 
130 void __init pci_acpi_crs_quirks(void)
131 {
132         int year;
133 
134         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
135                 if (iomem_resource.end <= 0xffffffff)
136                         pci_use_crs = false;
137         }
138 
139         dmi_check_system(pci_crs_quirks);
140 
141         /*
142          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
143          * takes precedence over anything we figured out above.
144          */
145         if (pci_probe & PCI_ROOT_NO_CRS)
146                 pci_use_crs = false;
147         else if (pci_probe & PCI_USE__CRS)
148                 pci_use_crs = true;
149 
150         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
151                "if necessary, use \"pci=%s\" and report a bug\n",
152                pci_use_crs ? "Using" : "Ignoring",
153                pci_use_crs ? "nocrs" : "use_crs");
154 }
155 
156 #ifdef  CONFIG_PCI_MMCONFIG
157 static int check_segment(u16 seg, struct device *dev, char *estr)
158 {
159         if (seg) {
160                 dev_err(dev,
161                         "%s can't access PCI configuration "
162                         "space under this host bridge.\n",
163                         estr);
164                 return -EIO;
165         }
166 
167         /*
168          * Failure in adding MMCFG information is not fatal,
169          * just can't access extended configuration space of
170          * devices under this host bridge.
171          */
172         dev_warn(dev,
173                  "%s can't access extended PCI configuration "
174                  "space under this bridge.\n",
175                  estr);
176 
177         return 0;
178 }
179 
180 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
181 {
182         int result, seg;
183         struct pci_root_info *info;
184         struct acpi_pci_root *root = ci->root;
185         struct device *dev = &ci->bridge->dev;
186 
187         info = container_of(ci, struct pci_root_info, common);
188         info->start_bus = (u8)root->secondary.start;
189         info->end_bus = (u8)root->secondary.end;
190         info->mcfg_added = false;
191         seg = info->sd.domain;
192 
193         /* return success if MMCFG is not in use */
194         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
195                 return 0;
196 
197         if (!(pci_probe & PCI_PROBE_MMCONF))
198                 return check_segment(seg, dev, "MMCONFIG is disabled,");
199 
200         result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
201                                      root->mcfg_addr);
202         if (result == 0) {
203                 /* enable MMCFG if it hasn't been enabled yet */
204                 if (raw_pci_ext_ops == NULL)
205                         raw_pci_ext_ops = &pci_mmcfg;
206                 info->mcfg_added = true;
207         } else if (result != -EEXIST)
208                 return check_segment(seg, dev,
209                          "fail to add MMCONFIG information,");
210 
211         return 0;
212 }
213 
214 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
215 {
216         struct pci_root_info *info;
217 
218         info = container_of(ci, struct pci_root_info, common);
219         if (info->mcfg_added) {
220                 pci_mmconfig_delete(info->sd.domain,
221                                     info->start_bus, info->end_bus);
222                 info->mcfg_added = false;
223         }
224 }
225 #else
226 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
227 {
228         return 0;
229 }
230 
231 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
232 {
233 }
234 #endif
235 
236 static int pci_acpi_root_get_node(struct acpi_pci_root *root)
237 {
238         int busnum = root->secondary.start;
239         struct acpi_device *device = root->device;
240         int node = acpi_get_node(device->handle);
241 
242         if (node == NUMA_NO_NODE) {
243                 node = x86_pci_root_bus_node(busnum);
244                 if (node != 0 && node != NUMA_NO_NODE)
245                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
246                                 node);
247         }
248         if (node != NUMA_NO_NODE && !node_online(node))
249                 node = NUMA_NO_NODE;
250 
251         return node;
252 }
253 
254 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
255 {
256         return setup_mcfg_map(ci);
257 }
258 
259 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
260 {
261         teardown_mcfg_map(ci);
262         kfree(container_of(ci, struct pci_root_info, common));
263 }
264 
265 /*
266  * An IO port or MMIO resource assigned to a PCI host bridge may be
267  * consumed by the host bridge itself or available to its child
268  * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
269  * to tell whether the resource is consumed by the host bridge itself,
270  * but firmware hasn't used that bit consistently, so we can't rely on it.
271  *
272  * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
273  * to be available to child bus/devices except one special case:
274  *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
275  *     to access PCI configuration space.
276  *
277  * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
278  */
279 static bool resource_is_pcicfg_ioport(struct resource *res)
280 {
281         return (res->flags & IORESOURCE_IO) &&
282                 res->start == 0xCF8 && res->end == 0xCFF;
283 }
284 
285 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
286 {
287         struct acpi_device *device = ci->bridge;
288         int busnum = ci->root->secondary.start;
289         struct resource_entry *entry, *tmp;
290         int status;
291 
292         status = acpi_pci_probe_root_resources(ci);
293         if (pci_use_crs) {
294                 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
295                         if (resource_is_pcicfg_ioport(entry->res))
296                                 resource_list_destroy_entry(entry);
297                 return status;
298         }
299 
300         resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
301                 dev_printk(KERN_DEBUG, &device->dev,
302                            "host bridge window %pR (ignored)\n", entry->res);
303                 resource_list_destroy_entry(entry);
304         }
305         x86_pci_root_bus_resources(busnum, &ci->resources);
306 
307         return 0;
308 }
309 
310 static struct acpi_pci_root_ops acpi_pci_root_ops = {
311         .pci_ops = &pci_root_ops,
312         .init_info = pci_acpi_root_init_info,
313         .release_info = pci_acpi_root_release_info,
314         .prepare_resources = pci_acpi_root_prepare_resources,
315 };
316 
317 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
318 {
319         int domain = root->segment;
320         int busnum = root->secondary.start;
321         int node = pci_acpi_root_get_node(root);
322         struct pci_bus *bus;
323 
324         if (pci_ignore_seg)
325                 root->segment = domain = 0;
326 
327         if (domain && !pci_domains_supported) {
328                 printk(KERN_WARNING "pci_bus %04x:%02x: "
329                        "ignored (multiple domains not supported)\n",
330                        domain, busnum);
331                 return NULL;
332         }
333 
334         bus = pci_find_bus(domain, busnum);
335         if (bus) {
336                 /*
337                  * If the desired bus has been scanned already, replace
338                  * its bus->sysdata.
339                  */
340                 struct pci_sysdata sd = {
341                         .domain = domain,
342                         .node = node,
343                         .companion = root->device
344                 };
345 
346                 memcpy(bus->sysdata, &sd, sizeof(sd));
347         } else {
348                 struct pci_root_info *info;
349 
350                 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
351                 if (!info)
352                         dev_err(&root->device->dev,
353                                 "pci_bus %04x:%02x: ignored (out of memory)\n",
354                                 domain, busnum);
355                 else {
356                         info->sd.domain = domain;
357                         info->sd.node = node;
358                         info->sd.companion = root->device;
359                         bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
360                                                    &info->common, &info->sd);
361                 }
362         }
363 
364         /* After the PCI-E bus has been walked and all devices discovered,
365          * configure any settings of the fabric that might be necessary.
366          */
367         if (bus) {
368                 struct pci_bus *child;
369                 list_for_each_entry(child, &bus->children, node)
370                         pcie_bus_configure_settings(child);
371         }
372 
373         return bus;
374 }
375 
376 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
377 {
378         /*
379          * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
380          * here, pci_create_root_bus() has been called by someone else and
381          * sysdata is likely to be different from what we expect.  Let it go in
382          * that case.
383          */
384         if (!bridge->dev.parent) {
385                 struct pci_sysdata *sd = bridge->bus->sysdata;
386                 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
387         }
388         return 0;
389 }
390 
391 int __init pci_acpi_init(void)
392 {
393         struct pci_dev *dev = NULL;
394 
395         if (acpi_noirq)
396                 return -ENODEV;
397 
398         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
399         acpi_irq_penalty_init();
400         pcibios_enable_irq = acpi_pci_irq_enable;
401         pcibios_disable_irq = acpi_pci_irq_disable;
402         x86_init.pci.init_irq = x86_init_noop;
403 
404         if (pci_routeirq) {
405                 /*
406                  * PCI IRQ routing is set up by pci_enable_device(), but we
407                  * also do it here in case there are still broken drivers that
408                  * don't use pci_enable_device().
409                  */
410                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
411                 for_each_pci_dev(dev)
412                         acpi_pci_irq_enable(dev);
413         }
414 
415         return 0;
416 }
417 

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