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
set_use_crs(const struct dmi_system_id * id)24 static int __init set_use_crs(const struct dmi_system_id *id)
25 {
26 pci_use_crs = true;
27 return 0;
28 }
29
set_nouse_crs(const struct dmi_system_id * id)30 static int __init set_nouse_crs(const struct dmi_system_id *id)
31 {
32 pci_use_crs = false;
33 return 0;
34 }
35
set_ignore_seg(const struct dmi_system_id * id)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
pci_acpi_crs_quirks(void)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
check_segment(u16 seg,struct device * dev,char * estr)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
setup_mcfg_map(struct acpi_pci_root_info * ci)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
teardown_mcfg_map(struct acpi_pci_root_info * ci)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
setup_mcfg_map(struct acpi_pci_root_info * ci)236 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
237 {
238 return 0;
239 }
240
teardown_mcfg_map(struct acpi_pci_root_info * ci)241 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
242 {
243 }
244 #endif
245
pci_acpi_root_get_node(struct acpi_pci_root * root)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
pci_acpi_root_init_info(struct acpi_pci_root_info * ci)264 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
265 {
266 return setup_mcfg_map(ci);
267 }
268
pci_acpi_root_release_info(struct acpi_pci_root_info * ci)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 */
resource_is_pcicfg_ioport(struct resource * res)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
pci_acpi_root_prepare_resources(struct acpi_pci_root_info * ci)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
pci_acpi_scan_root(struct acpi_pci_root * root)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
pcibios_root_bridge_prepare(struct pci_host_bridge * bridge)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
pci_acpi_init(void)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 }
427