3961103e91760a14d24eec1ad3caffa5ad1f2adb
[sfrench/cifs-2.6.git] / arch / x86 / pci / acpi.c
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         /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
118         {
119                 .callback = set_nouse_crs,
120                 .ident = "Supermicro X8DTH",
121                 .matches = {
122                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
123                         DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
124                         DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
125                 },
126         },
127
128         /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
129         {
130                 .callback = set_ignore_seg,
131                 .ident = "HP xw9300",
132                 .matches = {
133                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
134                         DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
135                 },
136         },
137         {}
138 };
139
140 void __init pci_acpi_crs_quirks(void)
141 {
142         int year;
143
144         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
145                 if (iomem_resource.end <= 0xffffffff)
146                         pci_use_crs = false;
147         }
148
149         dmi_check_system(pci_crs_quirks);
150
151         /*
152          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
153          * takes precedence over anything we figured out above.
154          */
155         if (pci_probe & PCI_ROOT_NO_CRS)
156                 pci_use_crs = false;
157         else if (pci_probe & PCI_USE__CRS)
158                 pci_use_crs = true;
159
160         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
161                "if necessary, use \"pci=%s\" and report a bug\n",
162                pci_use_crs ? "Using" : "Ignoring",
163                pci_use_crs ? "nocrs" : "use_crs");
164 }
165
166 #ifdef  CONFIG_PCI_MMCONFIG
167 static int check_segment(u16 seg, struct device *dev, char *estr)
168 {
169         if (seg) {
170                 dev_err(dev,
171                         "%s can't access PCI configuration "
172                         "space under this host bridge.\n",
173                         estr);
174                 return -EIO;
175         }
176
177         /*
178          * Failure in adding MMCFG information is not fatal,
179          * just can't access extended configuration space of
180          * devices under this host bridge.
181          */
182         dev_warn(dev,
183                  "%s can't access extended PCI configuration "
184                  "space under this bridge.\n",
185                  estr);
186
187         return 0;
188 }
189
190 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
191 {
192         int result, seg;
193         struct pci_root_info *info;
194         struct acpi_pci_root *root = ci->root;
195         struct device *dev = &ci->bridge->dev;
196
197         info = container_of(ci, struct pci_root_info, common);
198         info->start_bus = (u8)root->secondary.start;
199         info->end_bus = (u8)root->secondary.end;
200         info->mcfg_added = false;
201         seg = info->sd.domain;
202
203         /* return success if MMCFG is not in use */
204         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
205                 return 0;
206
207         if (!(pci_probe & PCI_PROBE_MMCONF))
208                 return check_segment(seg, dev, "MMCONFIG is disabled,");
209
210         result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
211                                      root->mcfg_addr);
212         if (result == 0) {
213                 /* enable MMCFG if it hasn't been enabled yet */
214                 if (raw_pci_ext_ops == NULL)
215                         raw_pci_ext_ops = &pci_mmcfg;
216                 info->mcfg_added = true;
217         } else if (result != -EEXIST)
218                 return check_segment(seg, dev,
219                          "fail to add MMCONFIG information,");
220
221         return 0;
222 }
223
224 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
225 {
226         struct pci_root_info *info;
227
228         info = container_of(ci, struct pci_root_info, common);
229         if (info->mcfg_added) {
230                 pci_mmconfig_delete(info->sd.domain,
231                                     info->start_bus, info->end_bus);
232                 info->mcfg_added = false;
233         }
234 }
235 #else
236 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
237 {
238         return 0;
239 }
240
241 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
242 {
243 }
244 #endif
245
246 static int pci_acpi_root_get_node(struct acpi_pci_root *root)
247 {
248         int busnum = root->secondary.start;
249         struct acpi_device *device = root->device;
250         int node = acpi_get_node(device->handle);
251
252         if (node == NUMA_NO_NODE) {
253                 node = x86_pci_root_bus_node(busnum);
254                 if (node != 0 && node != NUMA_NO_NODE)
255                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
256                                 node);
257         }
258         if (node != NUMA_NO_NODE && !node_online(node))
259                 node = NUMA_NO_NODE;
260
261         return node;
262 }
263
264 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
265 {
266         return setup_mcfg_map(ci);
267 }
268
269 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
270 {
271         teardown_mcfg_map(ci);
272         kfree(container_of(ci, struct pci_root_info, common));
273 }
274
275 /*
276  * An IO port or MMIO resource assigned to a PCI host bridge may be
277  * consumed by the host bridge itself or available to its child
278  * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
279  * to tell whether the resource is consumed by the host bridge itself,
280  * but firmware hasn't used that bit consistently, so we can't rely on it.
281  *
282  * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
283  * to be available to child bus/devices except one special case:
284  *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
285  *     to access PCI configuration space.
286  *
287  * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
288  */
289 static bool resource_is_pcicfg_ioport(struct resource *res)
290 {
291         return (res->flags & IORESOURCE_IO) &&
292                 res->start == 0xCF8 && res->end == 0xCFF;
293 }
294
295 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
296 {
297         struct acpi_device *device = ci->bridge;
298         int busnum = ci->root->secondary.start;
299         struct resource_entry *entry, *tmp;
300         int status;
301
302         status = acpi_pci_probe_root_resources(ci);
303         if (pci_use_crs) {
304                 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
305                         if (resource_is_pcicfg_ioport(entry->res))
306                                 resource_list_destroy_entry(entry);
307                 return status;
308         }
309
310         resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
311                 dev_printk(KERN_DEBUG, &device->dev,
312                            "host bridge window %pR (ignored)\n", entry->res);
313                 resource_list_destroy_entry(entry);
314         }
315         x86_pci_root_bus_resources(busnum, &ci->resources);
316
317         return 0;
318 }
319
320 static struct acpi_pci_root_ops acpi_pci_root_ops = {
321         .pci_ops = &pci_root_ops,
322         .init_info = pci_acpi_root_init_info,
323         .release_info = pci_acpi_root_release_info,
324         .prepare_resources = pci_acpi_root_prepare_resources,
325 };
326
327 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
328 {
329         int domain = root->segment;
330         int busnum = root->secondary.start;
331         int node = pci_acpi_root_get_node(root);
332         struct pci_bus *bus;
333
334         if (pci_ignore_seg)
335                 root->segment = domain = 0;
336
337         if (domain && !pci_domains_supported) {
338                 printk(KERN_WARNING "pci_bus %04x:%02x: "
339                        "ignored (multiple domains not supported)\n",
340                        domain, busnum);
341                 return NULL;
342         }
343
344         bus = pci_find_bus(domain, busnum);
345         if (bus) {
346                 /*
347                  * If the desired bus has been scanned already, replace
348                  * its bus->sysdata.
349                  */
350                 struct pci_sysdata sd = {
351                         .domain = domain,
352                         .node = node,
353                         .companion = root->device
354                 };
355
356                 memcpy(bus->sysdata, &sd, sizeof(sd));
357         } else {
358                 struct pci_root_info *info;
359
360                 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
361                 if (!info)
362                         dev_err(&root->device->dev,
363                                 "pci_bus %04x:%02x: ignored (out of memory)\n",
364                                 domain, busnum);
365                 else {
366                         info->sd.domain = domain;
367                         info->sd.node = node;
368                         info->sd.companion = root->device;
369                         bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
370                                                    &info->common, &info->sd);
371                 }
372         }
373
374         /* After the PCI-E bus has been walked and all devices discovered,
375          * configure any settings of the fabric that might be necessary.
376          */
377         if (bus) {
378                 struct pci_bus *child;
379                 list_for_each_entry(child, &bus->children, node)
380                         pcie_bus_configure_settings(child);
381         }
382
383         return bus;
384 }
385
386 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
387 {
388         /*
389          * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
390          * here, pci_create_root_bus() has been called by someone else and
391          * sysdata is likely to be different from what we expect.  Let it go in
392          * that case.
393          */
394         if (!bridge->dev.parent) {
395                 struct pci_sysdata *sd = bridge->bus->sysdata;
396                 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
397         }
398         return 0;
399 }
400
401 int __init pci_acpi_init(void)
402 {
403         struct pci_dev *dev = NULL;
404
405         if (acpi_noirq)
406                 return -ENODEV;
407
408         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
409         acpi_irq_penalty_init();
410         pcibios_enable_irq = acpi_pci_irq_enable;
411         pcibios_disable_irq = acpi_pci_irq_disable;
412         x86_init.pci.init_irq = x86_init_noop;
413
414         if (pci_routeirq) {
415                 /*
416                  * PCI IRQ routing is set up by pci_enable_device(), but we
417                  * also do it here in case there are still broken drivers that
418                  * don't use pci_enable_device().
419                  */
420                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
421                 for_each_pci_dev(dev)
422                         acpi_pci_irq_enable(dev);
423         }
424
425         return 0;
426 }