1 // SPDX-License-Identifier: GPL-2.0
2
3 #define pr_fmt(fmt) "PCI: " fmt
4
5 #include <linux/pci.h>
6 #include <linux/acpi.h>
7 #include <linux/init.h>
8 #include <linux/irq.h>
9 #include <linux/dmi.h>
10 #include <linux/slab.h>
11 #include <linux/pci-acpi.h>
12 #include <asm/numa.h>
13 #include <asm/pci_x86.h>
14
15 struct pci_root_info {
16 struct acpi_pci_root_info common;
17 struct pci_sysdata sd;
18 #ifdef CONFIG_PCI_MMCONFIG
19 bool mcfg_added;
20 u8 start_bus;
21 u8 end_bus;
22 #endif
23 };
24
25 bool pci_use_e820 = true;
26 static bool pci_use_crs = true;
27 static bool pci_ignore_seg;
28
29 static int __init set_use_crs(const struct dmi_system_id *id)
30 {
31 pci_use_crs = true;
32 return 0;
33 }
34
35 static int __init set_nouse_crs(const struct dmi_system_id *id)
36 {
37 pci_use_crs = false;
38 return 0;
39 }
40
41 static int __init set_ignore_seg(const struct dmi_system_id *id)
42 {
43 pr_info("%s detected: ignoring ACPI _SEG\n", id->ident);
44 pci_ignore_seg = true;
45 return 0;
46 }
47
48 static int __init set_no_e820(const struct dmi_system_id *id)
49 {
50 pr_info("%s detected: not clipping E820 regions from _CRS\n",
51 id->ident);
52 pci_use_e820 = false;
53 return 0;
54 }
55
56 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
57 /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
58 {
59 .callback = set_use_crs,
60 .ident = "IBM System x3800",
61 .matches = {
62 DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
63 DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
64 },
65 },
66 /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
67 /* 2006 AMD HT/VIA system with two host bridges */
68 {
69 .callback = set_use_crs,
70 .ident = "ASRock ALiveSATA2-GLAN",
71 .matches = {
72 DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
73 },
74 },
75 /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
76 /* 2006 AMD HT/VIA system with two host bridges */
77 {
78 .callback = set_use_crs,
79 .ident = "ASUS M2V-MX SE",
80 .matches = {
81 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
82 DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
83 DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
84 },
85 },
86 /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
87 {
88 .callback = set_use_crs,
89 .ident = "MSI MS-7253",
90 .matches = {
91 DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
92 DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
93 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
94 },
95 },
96 /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
97 /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
98 {
99 .callback = set_use_crs,
100 .ident = "Foxconn K8M890-8237A",
101 .matches = {
102 DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
103 DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
104 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
105 },
106 },
107
108 /* Now for the blacklist.. */
109
110 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
111 {
112 .callback = set_nouse_crs,
113 .ident = "Dell Studio 1557",
114 .matches = {
115 DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
116 DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
117 DMI_MATCH(DMI_BIOS_VERSION, "A09"),
118 },
119 },
120 /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
121 {
122 .callback = set_nouse_crs,
123 .ident = "Thinkpad SL510",
124 .matches = {
125 DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
126 DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
127 DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
128 },
129 },
130 /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
131 {
132 .callback = set_nouse_crs,
133 .ident = "Supermicro X8DTH",
134 .matches = {
135 DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
136 DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
137 DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
138 },
139 },
140
141 /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
142 {
143 .callback = set_ignore_seg,
144 .ident = "HP xw9300",
145 .matches = {
146 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
147 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
148 },
149 },
150
151 /*
152 * Many Lenovo models with "IIL" in their DMI_PRODUCT_VERSION have
153 * an E820 reserved region that covers the entire 32-bit host
154 * bridge memory window from _CRS. Using the E820 region to clip
155 * _CRS means no space is available for hot-added or uninitialized
156 * PCI devices. This typically breaks I2C controllers for touchpads
157 * and hot-added Thunderbolt devices. See the commit log for
158 * models known to require this quirk and related bug reports.
159 */
160 {
161 .callback = set_no_e820,
162 .ident = "Lenovo *IIL* product version",
163 .matches = {
164 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
165 DMI_MATCH(DMI_PRODUCT_VERSION, "IIL"),
166 },
167 },
168
169 /*
170 * The Acer Spin 5 (SP513-54N) has the same E820 reservation covering
171 * the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
172 * See https://bugs.launchpad.net/bugs/1884232
173 */
174 {
175 .callback = set_no_e820,
176 .ident = "Acer Spin 5 (SP513-54N)",
177 .matches = {
178 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
179 DMI_MATCH(DMI_PRODUCT_NAME, "Spin SP513-54N"),
180 },
181 },
182
183 /*
184 * Clevo X170KM-G barebones have the same E820 reservation covering
185 * the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
186 * See https://bugzilla.kernel.org/show_bug.cgi?id=214259
187 */
188 {
189 .callback = set_no_e820,
190 .ident = "Clevo X170KM-G Barebone",
191 .matches = {
192 DMI_MATCH(DMI_BOARD_NAME, "X170KM-G"),
193 },
194 },
195 {}
196 };
197
198 void __init pci_acpi_crs_quirks(void)
199 {
200 int year = dmi_get_bios_year();
201
202 if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff)
203 pci_use_crs = false;
204
205 /*
206 * Some firmware includes unusable space (host bridge registers,
207 * hidden PCI device BARs, etc) in PCI host bridge _CRS. This is a
208 * firmware defect, and 4dc2287c1805 ("x86: avoid E820 regions when
209 * allocating address space") has clipped out the unusable space in
210 * the past.
211 *
212 * But other firmware supplies E820 reserved regions that cover
213 * entire _CRS windows, so clipping throws away the entire window,
214 * leaving none for hot-added or uninitialized devices. These E820
215 * entries are probably *not* a firmware defect, so disable the
216 * clipping by default for post-2022 machines.
217 *
218 * We already have quirks to disable clipping for pre-2023
219 * machines, and we'll likely need quirks to *enable* clipping for
220 * post-2022 machines that incorrectly include unusable space in
221 * _CRS.
222 */
223 if (year >= 2023)
224 pci_use_e820 = false;
225
226 dmi_check_system(pci_crs_quirks);
227
228 /*
229 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
230 * takes precedence over anything we figured out above.
231 */
232 if (pci_probe & PCI_ROOT_NO_CRS)
233 pci_use_crs = false;
234 else if (pci_probe & PCI_USE__CRS)
235 pci_use_crs = true;
236
237 pr_info("%s host bridge windows from ACPI; if necessary, use \"pci=%s\" and report a bug\n",
238 pci_use_crs ? "Using" : "Ignoring",
239 pci_use_crs ? "nocrs" : "use_crs");
240
241 /* "pci=use_e820"/"pci=no_e820" on the kernel cmdline takes precedence */
242 if (pci_probe & PCI_NO_E820)
243 pci_use_e820 = false;
244 else if (pci_probe & PCI_USE_E820)
245 pci_use_e820 = true;
246
247 pr_info("%s E820 reservations for host bridge windows\n",
248 pci_use_e820 ? "Using" : "Ignoring");
249 if (pci_probe & (PCI_NO_E820 | PCI_USE_E820))
250 pr_info("Please notify linux-pci@vger.kernel.org so future kernels can do this automatically\n");
251 }
252
253 #ifdef CONFIG_PCI_MMCONFIG
254 static int check_segment(u16 seg, struct device *dev, char *estr)
255 {
256 if (seg) {
257 dev_err(dev, "%s can't access configuration space under this host bridge\n",
258 estr);
259 return -EIO;
260 }
261
262 /*
263 * Failure in adding MMCFG information is not fatal,
264 * just can't access extended configuration space of
265 * devices under this host bridge.
266 */
267 dev_warn(dev, "%s can't access extended configuration space under this bridge\n",
268 estr);
269
270 return 0;
271 }
272
273 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
274 {
275 int result, seg;
276 struct pci_root_info *info;
277 struct acpi_pci_root *root = ci->root;
278 struct device *dev = &ci->bridge->dev;
279
280 info = container_of(ci, struct pci_root_info, common);
281 info->start_bus = (u8)root->secondary.start;
282 info->end_bus = (u8)root->secondary.end;
283 info->mcfg_added = false;
284 seg = info->sd.domain;
285
286 dev_dbg(dev, "%s(%04x %pR ECAM %pa)\n", __func__, seg,
287 &root->secondary, &root->mcfg_addr);
288
289 /* return success if MMCFG is not in use */
290 if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
291 return 0;
292
293 if (!(pci_probe & PCI_PROBE_MMCONF))
294 return check_segment(seg, dev, "MMCONFIG is disabled,");
295
296 result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
297 root->mcfg_addr);
298 if (result == 0) {
299 /* enable MMCFG if it hasn't been enabled yet */
300 if (raw_pci_ext_ops == NULL)
301 raw_pci_ext_ops = &pci_mmcfg;
302 info->mcfg_added = true;
303 } else if (result != -EEXIST)
304 return check_segment(seg, dev,
305 "fail to add MMCONFIG information,");
306
307 return 0;
308 }
309
310 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
311 {
312 struct pci_root_info *info;
313
314 info = container_of(ci, struct pci_root_info, common);
315 if (info->mcfg_added) {
316 pci_mmconfig_delete(info->sd.domain,
317 info->start_bus, info->end_bus);
318 info->mcfg_added = false;
319 }
320 }
321 #else
322 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
323 {
324 return 0;
325 }
326
327 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
328 {
329 }
330 #endif
331
332 static int pci_acpi_root_get_node(struct acpi_pci_root *root)
333 {
334 int busnum = root->secondary.start;
335 struct acpi_device *device = root->device;
336 int node = acpi_get_node(device->handle);
337
338 if (node == NUMA_NO_NODE) {
339 node = x86_pci_root_bus_node(busnum);
340 if (node != 0 && node != NUMA_NO_NODE)
341 dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
342 node);
343 }
344 if (node != NUMA_NO_NODE && !node_online(node))
345 node = NUMA_NO_NODE;
346
347 return node;
348 }
349
350 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
351 {
352 return setup_mcfg_map(ci);
353 }
354
355 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
356 {
357 teardown_mcfg_map(ci);
358 kfree(container_of(ci, struct pci_root_info, common));
359 }
360
361 /*
362 * An IO port or MMIO resource assigned to a PCI host bridge may be
363 * consumed by the host bridge itself or available to its child
364 * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
365 * to tell whether the resource is consumed by the host bridge itself,
366 * but firmware hasn't used that bit consistently, so we can't rely on it.
367 *
368 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
369 * to be available to child bus/devices except one special case:
370 * IO port [0xCF8-0xCFF] is consumed by the host bridge itself
371 * to access PCI configuration space.
372 *
373 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
374 */
375 static bool resource_is_pcicfg_ioport(struct resource *res)
376 {
377 return (res->flags & IORESOURCE_IO) &&
378 res->start == 0xCF8 && res->end == 0xCFF;
379 }
380
381 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
382 {
383 struct acpi_device *device = ci->bridge;
384 int busnum = ci->root->secondary.start;
385 struct resource_entry *entry, *tmp;
386 int status;
387
388 status = acpi_pci_probe_root_resources(ci);
389
390 if (pci_use_crs) {
391 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
392 if (resource_is_pcicfg_ioport(entry->res))
393 resource_list_destroy_entry(entry);
394 return status;
395 }
396
397 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
398 dev_printk(KERN_DEBUG, &device->dev,
399 "host bridge window %pR (ignored)\n", entry->res);
400 resource_list_destroy_entry(entry);
401 }
402 x86_pci_root_bus_resources(busnum, &ci->resources);
403
404 return 0;
405 }
406
407 static struct acpi_pci_root_ops acpi_pci_root_ops = {
408 .pci_ops = &pci_root_ops,
409 .init_info = pci_acpi_root_init_info,
410 .release_info = pci_acpi_root_release_info,
411 .prepare_resources = pci_acpi_root_prepare_resources,
412 };
413
414 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
415 {
416 int domain = root->segment;
417 int busnum = root->secondary.start;
418 int node = pci_acpi_root_get_node(root);
419 struct pci_bus *bus;
420
421 if (pci_ignore_seg)
422 root->segment = domain = 0;
423
424 if (domain && !pci_domains_supported) {
425 pr_warn("pci_bus %04x:%02x: ignored (multiple domains not supported)\n",
426 domain, busnum);
427 return NULL;
428 }
429
430 bus = pci_find_bus(domain, busnum);
431 if (bus) {
432 /*
433 * If the desired bus has been scanned already, replace
434 * its bus->sysdata.
435 */
436 struct pci_sysdata sd = {
437 .domain = domain,
438 .node = node,
439 .companion = root->device
440 };
441
442 memcpy(bus->sysdata, &sd, sizeof(sd));
443 } else {
444 struct pci_root_info *info;
445
446 info = kzalloc(sizeof(*info), GFP_KERNEL);
447 if (!info)
448 dev_err(&root->device->dev,
449 "pci_bus %04x:%02x: ignored (out of memory)\n",
450 domain, busnum);
451 else {
452 info->sd.domain = domain;
453 info->sd.node = node;
454 info->sd.companion = root->device;
455 bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
456 &info->common, &info->sd);
457 }
458 }
459
460 /* After the PCI-E bus has been walked and all devices discovered,
461 * configure any settings of the fabric that might be necessary.
462 */
463 if (bus) {
464 struct pci_bus *child;
465 list_for_each_entry(child, &bus->children, node)
466 pcie_bus_configure_settings(child);
467 }
468
469 return bus;
470 }
471
472 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
473 {
474 /*
475 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
476 * here, pci_create_root_bus() has been called by someone else and
477 * sysdata is likely to be different from what we expect. Let it go in
478 * that case.
479 */
480 if (!bridge->dev.parent) {
481 struct pci_sysdata *sd = bridge->bus->sysdata;
482 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
483 }
484 return 0;
485 }
486
487 int __init pci_acpi_init(void)
488 {
489 struct pci_dev *dev = NULL;
490
491 if (acpi_noirq)
492 return -ENODEV;
493
494 pr_info("Using ACPI for IRQ routing\n");
495 acpi_irq_penalty_init();
496 pcibios_enable_irq = acpi_pci_irq_enable;
497 pcibios_disable_irq = acpi_pci_irq_disable;
498 x86_init.pci.init_irq = x86_init_noop;
499
500 if (pci_routeirq) {
501 /*
502 * PCI IRQ routing is set up by pci_enable_device(), but we
503 * also do it here in case there are still broken drivers that
504 * don't use pci_enable_device().
505 */
506 pr_info("Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
507 for_each_pci_dev(dev)
508 acpi_pci_irq_enable(dev);
509 }
510
511 return 0;
512 }
513
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