GNU Linux-libre 4.14.328-gnu1
[releases.git] / arch / x86 / pci / acpi.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/pci.h>
3 #include <linux/acpi.h>
4 #include <linux/init.h>
5 #include <linux/irq.h>
6 #include <linux/dmi.h>
7 #include <linux/slab.h>
8 #include <linux/pci-acpi.h>
9 #include <asm/numa.h>
10 #include <asm/pci_x86.h>
11
12 struct pci_root_info {
13         struct acpi_pci_root_info common;
14         struct pci_sysdata sd;
15 #ifdef  CONFIG_PCI_MMCONFIG
16         bool mcfg_added;
17         u8 start_bus;
18         u8 end_bus;
19 #endif
20 };
21
22 static bool pci_use_crs = true;
23 static bool pci_ignore_seg = false;
24
25 static int __init set_use_crs(const struct dmi_system_id *id)
26 {
27         pci_use_crs = true;
28         return 0;
29 }
30
31 static int __init set_nouse_crs(const struct dmi_system_id *id)
32 {
33         pci_use_crs = false;
34         return 0;
35 }
36
37 static int __init set_ignore_seg(const struct dmi_system_id *id)
38 {
39         printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
40         pci_ignore_seg = true;
41         return 0;
42 }
43
44 static const struct dmi_system_id pci_crs_quirks[] __initconst = {
45         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
46         {
47                 .callback = set_use_crs,
48                 .ident = "IBM System x3800",
49                 .matches = {
50                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
51                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
52                 },
53         },
54         /* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
55         /* 2006 AMD HT/VIA system with two host bridges */
56         {
57                 .callback = set_use_crs,
58                 .ident = "ASRock ALiveSATA2-GLAN",
59                 .matches = {
60                         DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
61                 },
62         },
63         /* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
64         /* 2006 AMD HT/VIA system with two host bridges */
65         {
66                 .callback = set_use_crs,
67                 .ident = "ASUS M2V-MX SE",
68                 .matches = {
69                         DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
70                         DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
71                         DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
72                 },
73         },
74         /* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
75         {
76                 .callback = set_use_crs,
77                 .ident = "MSI MS-7253",
78                 .matches = {
79                         DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
80                         DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
81                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
82                 },
83         },
84         /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
85         /* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
86         {
87                 .callback = set_use_crs,
88                 .ident = "Foxconn K8M890-8237A",
89                 .matches = {
90                         DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
91                         DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
92                         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
93                 },
94         },
95
96         /* Now for the blacklist.. */
97
98         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
99         {
100                 .callback = set_nouse_crs,
101                 .ident = "Dell Studio 1557",
102                 .matches = {
103                         DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
104                         DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
105                         DMI_MATCH(DMI_BIOS_VERSION, "A09"),
106                 },
107         },
108         /* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
109         {
110                 .callback = set_nouse_crs,
111                 .ident = "Thinkpad SL510",
112                 .matches = {
113                         DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
114                         DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
115                         DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
116                 },
117         },
118         /* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
119         {
120                 .callback = set_nouse_crs,
121                 .ident = "Supermicro X8DTH",
122                 .matches = {
123                         DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
124                         DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
125                         DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
126                 },
127         },
128
129         /* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
130         {
131                 .callback = set_ignore_seg,
132                 .ident = "HP xw9300",
133                 .matches = {
134                         DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
135                         DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
136                 },
137         },
138         {}
139 };
140
141 void __init pci_acpi_crs_quirks(void)
142 {
143         int year;
144
145         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
146                 if (iomem_resource.end <= 0xffffffff)
147                         pci_use_crs = false;
148         }
149
150         dmi_check_system(pci_crs_quirks);
151
152         /*
153          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
154          * takes precedence over anything we figured out above.
155          */
156         if (pci_probe & PCI_ROOT_NO_CRS)
157                 pci_use_crs = false;
158         else if (pci_probe & PCI_USE__CRS)
159                 pci_use_crs = true;
160
161         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
162                "if necessary, use \"pci=%s\" and report a bug\n",
163                pci_use_crs ? "Using" : "Ignoring",
164                pci_use_crs ? "nocrs" : "use_crs");
165 }
166
167 #ifdef  CONFIG_PCI_MMCONFIG
168 static int check_segment(u16 seg, struct device *dev, char *estr)
169 {
170         if (seg) {
171                 dev_err(dev,
172                         "%s can't access PCI configuration "
173                         "space under this host bridge.\n",
174                         estr);
175                 return -EIO;
176         }
177
178         /*
179          * Failure in adding MMCFG information is not fatal,
180          * just can't access extended configuration space of
181          * devices under this host bridge.
182          */
183         dev_warn(dev,
184                  "%s can't access extended PCI configuration "
185                  "space under this bridge.\n",
186                  estr);
187
188         return 0;
189 }
190
191 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
192 {
193         int result, seg;
194         struct pci_root_info *info;
195         struct acpi_pci_root *root = ci->root;
196         struct device *dev = &ci->bridge->dev;
197
198         info = container_of(ci, struct pci_root_info, common);
199         info->start_bus = (u8)root->secondary.start;
200         info->end_bus = (u8)root->secondary.end;
201         info->mcfg_added = false;
202         seg = info->sd.domain;
203
204         /* return success if MMCFG is not in use */
205         if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
206                 return 0;
207
208         if (!(pci_probe & PCI_PROBE_MMCONF))
209                 return check_segment(seg, dev, "MMCONFIG is disabled,");
210
211         result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
212                                      root->mcfg_addr);
213         if (result == 0) {
214                 /* enable MMCFG if it hasn't been enabled yet */
215                 if (raw_pci_ext_ops == NULL)
216                         raw_pci_ext_ops = &pci_mmcfg;
217                 info->mcfg_added = true;
218         } else if (result != -EEXIST)
219                 return check_segment(seg, dev,
220                          "fail to add MMCONFIG information,");
221
222         return 0;
223 }
224
225 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
226 {
227         struct pci_root_info *info;
228
229         info = container_of(ci, struct pci_root_info, common);
230         if (info->mcfg_added) {
231                 pci_mmconfig_delete(info->sd.domain,
232                                     info->start_bus, info->end_bus);
233                 info->mcfg_added = false;
234         }
235 }
236 #else
237 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
238 {
239         return 0;
240 }
241
242 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
243 {
244 }
245 #endif
246
247 static int pci_acpi_root_get_node(struct acpi_pci_root *root)
248 {
249         int busnum = root->secondary.start;
250         struct acpi_device *device = root->device;
251         int node = acpi_get_node(device->handle);
252
253         if (node == NUMA_NO_NODE) {
254                 node = x86_pci_root_bus_node(busnum);
255                 if (node != 0 && node != NUMA_NO_NODE)
256                         dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
257                                 node);
258         }
259         if (node != NUMA_NO_NODE && !node_online(node))
260                 node = NUMA_NO_NODE;
261
262         return node;
263 }
264
265 static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
266 {
267         return setup_mcfg_map(ci);
268 }
269
270 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
271 {
272         teardown_mcfg_map(ci);
273         kfree(container_of(ci, struct pci_root_info, common));
274 }
275
276 /*
277  * An IO port or MMIO resource assigned to a PCI host bridge may be
278  * consumed by the host bridge itself or available to its child
279  * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
280  * to tell whether the resource is consumed by the host bridge itself,
281  * but firmware hasn't used that bit consistently, so we can't rely on it.
282  *
283  * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
284  * to be available to child bus/devices except one special case:
285  *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
286  *     to access PCI configuration space.
287  *
288  * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
289  */
290 static bool resource_is_pcicfg_ioport(struct resource *res)
291 {
292         return (res->flags & IORESOURCE_IO) &&
293                 res->start == 0xCF8 && res->end == 0xCFF;
294 }
295
296 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
297 {
298         struct acpi_device *device = ci->bridge;
299         int busnum = ci->root->secondary.start;
300         struct resource_entry *entry, *tmp;
301         int status;
302
303         status = acpi_pci_probe_root_resources(ci);
304         if (pci_use_crs) {
305                 resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
306                         if (resource_is_pcicfg_ioport(entry->res))
307                                 resource_list_destroy_entry(entry);
308                 return status;
309         }
310
311         resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
312                 dev_printk(KERN_DEBUG, &device->dev,
313                            "host bridge window %pR (ignored)\n", entry->res);
314                 resource_list_destroy_entry(entry);
315         }
316         x86_pci_root_bus_resources(busnum, &ci->resources);
317
318         return 0;
319 }
320
321 static struct acpi_pci_root_ops acpi_pci_root_ops = {
322         .pci_ops = &pci_root_ops,
323         .init_info = pci_acpi_root_init_info,
324         .release_info = pci_acpi_root_release_info,
325         .prepare_resources = pci_acpi_root_prepare_resources,
326 };
327
328 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
329 {
330         int domain = root->segment;
331         int busnum = root->secondary.start;
332         int node = pci_acpi_root_get_node(root);
333         struct pci_bus *bus;
334
335         if (pci_ignore_seg)
336                 root->segment = domain = 0;
337
338         if (domain && !pci_domains_supported) {
339                 printk(KERN_WARNING "pci_bus %04x:%02x: "
340                        "ignored (multiple domains not supported)\n",
341                        domain, busnum);
342                 return NULL;
343         }
344
345         bus = pci_find_bus(domain, busnum);
346         if (bus) {
347                 /*
348                  * If the desired bus has been scanned already, replace
349                  * its bus->sysdata.
350                  */
351                 struct pci_sysdata sd = {
352                         .domain = domain,
353                         .node = node,
354                         .companion = root->device
355                 };
356
357                 memcpy(bus->sysdata, &sd, sizeof(sd));
358         } else {
359                 struct pci_root_info *info;
360
361                 info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
362                 if (!info)
363                         dev_err(&root->device->dev,
364                                 "pci_bus %04x:%02x: ignored (out of memory)\n",
365                                 domain, busnum);
366                 else {
367                         info->sd.domain = domain;
368                         info->sd.node = node;
369                         info->sd.companion = root->device;
370                         bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
371                                                    &info->common, &info->sd);
372                 }
373         }
374
375         /* After the PCI-E bus has been walked and all devices discovered,
376          * configure any settings of the fabric that might be necessary.
377          */
378         if (bus) {
379                 struct pci_bus *child;
380                 list_for_each_entry(child, &bus->children, node)
381                         pcie_bus_configure_settings(child);
382         }
383
384         return bus;
385 }
386
387 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
388 {
389         /*
390          * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
391          * here, pci_create_root_bus() has been called by someone else and
392          * sysdata is likely to be different from what we expect.  Let it go in
393          * that case.
394          */
395         if (!bridge->dev.parent) {
396                 struct pci_sysdata *sd = bridge->bus->sysdata;
397                 ACPI_COMPANION_SET(&bridge->dev, sd->companion);
398         }
399         return 0;
400 }
401
402 int __init pci_acpi_init(void)
403 {
404         struct pci_dev *dev = NULL;
405
406         if (acpi_noirq)
407                 return -ENODEV;
408
409         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
410         acpi_irq_penalty_init();
411         pcibios_enable_irq = acpi_pci_irq_enable;
412         pcibios_disable_irq = acpi_pci_irq_disable;
413         x86_init.pci.init_irq = x86_init_noop;
414
415         if (pci_routeirq) {
416                 /*
417                  * PCI IRQ routing is set up by pci_enable_device(), but we
418                  * also do it here in case there are still broken drivers that
419                  * don't use pci_enable_device().
420                  */
421                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
422                 for_each_pci_dev(dev)
423                         acpi_pci_irq_enable(dev);
424         }
425
426         return 0;
427 }