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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 
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