Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
// SPDX-License-Identifier: GPL-2.0
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/pci-acpi.h>
#include <asm/numa.h>
#include <asm/pci_x86.h>

struct pci_root_info {
	struct acpi_pci_root_info common;
	struct pci_sysdata sd;
#ifdef	CONFIG_PCI_MMCONFIG
	bool mcfg_added;
	u8 start_bus;
	u8 end_bus;
#endif
};

static bool pci_use_crs = true;
static bool pci_ignore_seg = false;

static int __init set_use_crs(const struct dmi_system_id *id)
{
	pci_use_crs = true;
	return 0;
}

static int __init set_nouse_crs(const struct dmi_system_id *id)
{
	pci_use_crs = false;
	return 0;
}

static int __init set_ignore_seg(const struct dmi_system_id *id)
{
	printk(KERN_INFO "PCI: %s detected: ignoring ACPI _SEG\n", id->ident);
	pci_ignore_seg = true;
	return 0;
}

static const struct dmi_system_id pci_crs_quirks[] __initconst = {
	/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
	{
		.callback = set_use_crs,
		.ident = "IBM System x3800",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
			DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
		},
	},
	/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
	/* 2006 AMD HT/VIA system with two host bridges */
        {
		.callback = set_use_crs,
		.ident = "ASRock ALiveSATA2-GLAN",
		.matches = {
			DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
                },
        },
	/* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
	/* 2006 AMD HT/VIA system with two host bridges */
	{
		.callback = set_use_crs,
		.ident = "ASUS M2V-MX SE",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
			DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
			DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
		},
	},
	/* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
	{
		.callback = set_use_crs,
		.ident = "MSI MS-7253",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
			DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
		},
	},
	/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
	/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
	{
		.callback = set_use_crs,
		.ident = "Foxconn K8M890-8237A",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
			DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
			DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
		},
	},

	/* Now for the blacklist.. */

	/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
	{
		.callback = set_nouse_crs,
		.ident = "Dell Studio 1557",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
			DMI_MATCH(DMI_BIOS_VERSION, "A09"),
		},
	},
	/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
	{
		.callback = set_nouse_crs,
		.ident = "Thinkpad SL510",
		.matches = {
			DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
			DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
			DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
		},
	},
	/* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
	{
		.callback = set_nouse_crs,
		.ident = "Supermicro X8DTH",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
			DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
			DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
		},
	},

	/* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
	{
		.callback = set_ignore_seg,
		.ident = "HP xw9300",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
			DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
		},
	},
	{}
};

void __init pci_acpi_crs_quirks(void)
{
	int year;

	if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008) {
		if (iomem_resource.end <= 0xffffffff)
			pci_use_crs = false;
	}

	dmi_check_system(pci_crs_quirks);

	/*
	 * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
	 * takes precedence over anything we figured out above.
	 */
	if (pci_probe & PCI_ROOT_NO_CRS)
		pci_use_crs = false;
	else if (pci_probe & PCI_USE__CRS)
		pci_use_crs = true;

	printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
	       "if necessary, use \"pci=%s\" and report a bug\n",
	       pci_use_crs ? "Using" : "Ignoring",
	       pci_use_crs ? "nocrs" : "use_crs");
}

#ifdef	CONFIG_PCI_MMCONFIG
static int check_segment(u16 seg, struct device *dev, char *estr)
{
	if (seg) {
		dev_err(dev,
			"%s can't access PCI configuration "
			"space under this host bridge.\n",
			estr);
		return -EIO;
	}

	/*
	 * Failure in adding MMCFG information is not fatal,
	 * just can't access extended configuration space of
	 * devices under this host bridge.
	 */
	dev_warn(dev,
		 "%s can't access extended PCI configuration "
		 "space under this bridge.\n",
		 estr);

	return 0;
}

static int setup_mcfg_map(struct acpi_pci_root_info *ci)
{
	int result, seg;
	struct pci_root_info *info;
	struct acpi_pci_root *root = ci->root;
	struct device *dev = &ci->bridge->dev;

	info = container_of(ci, struct pci_root_info, common);
	info->start_bus = (u8)root->secondary.start;
	info->end_bus = (u8)root->secondary.end;
	info->mcfg_added = false;
	seg = info->sd.domain;

	/* return success if MMCFG is not in use */
	if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
		return 0;

	if (!(pci_probe & PCI_PROBE_MMCONF))
		return check_segment(seg, dev, "MMCONFIG is disabled,");

	result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
				     root->mcfg_addr);
	if (result == 0) {
		/* enable MMCFG if it hasn't been enabled yet */
		if (raw_pci_ext_ops == NULL)
			raw_pci_ext_ops = &pci_mmcfg;
		info->mcfg_added = true;
	} else if (result != -EEXIST)
		return check_segment(seg, dev,
			 "fail to add MMCONFIG information,");

	return 0;
}

static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
{
	struct pci_root_info *info;

	info = container_of(ci, struct pci_root_info, common);
	if (info->mcfg_added) {
		pci_mmconfig_delete(info->sd.domain,
				    info->start_bus, info->end_bus);
		info->mcfg_added = false;
	}
}
#else
static int setup_mcfg_map(struct acpi_pci_root_info *ci)
{
	return 0;
}

static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
{
}
#endif

static int pci_acpi_root_get_node(struct acpi_pci_root *root)
{
	int busnum = root->secondary.start;
	struct acpi_device *device = root->device;
	int node = acpi_get_node(device->handle);

	if (node == NUMA_NO_NODE) {
		node = x86_pci_root_bus_node(busnum);
		if (node != 0 && node != NUMA_NO_NODE)
			dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
				node);
	}
	if (node != NUMA_NO_NODE && !node_online(node))
		node = NUMA_NO_NODE;

	return node;
}

static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
{
	return setup_mcfg_map(ci);
}

static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
{
	teardown_mcfg_map(ci);
	kfree(container_of(ci, struct pci_root_info, common));
}

/*
 * An IO port or MMIO resource assigned to a PCI host bridge may be
 * consumed by the host bridge itself or available to its child
 * bus/devices. The ACPI specification defines a bit (Producer/Consumer)
 * to tell whether the resource is consumed by the host bridge itself,
 * but firmware hasn't used that bit consistently, so we can't rely on it.
 *
 * On x86 and IA64 platforms, all IO port and MMIO resources are assumed
 * to be available to child bus/devices except one special case:
 *     IO port [0xCF8-0xCFF] is consumed by the host bridge itself
 *     to access PCI configuration space.
 *
 * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
 */
static bool resource_is_pcicfg_ioport(struct resource *res)
{
	return (res->flags & IORESOURCE_IO) &&
		res->start == 0xCF8 && res->end == 0xCFF;
}

static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
{
	struct acpi_device *device = ci->bridge;
	int busnum = ci->root->secondary.start;
	struct resource_entry *entry, *tmp;
	int status;

	status = acpi_pci_probe_root_resources(ci);
	if (pci_use_crs) {
		resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
			if (resource_is_pcicfg_ioport(entry->res))
				resource_list_destroy_entry(entry);
		return status;
	}

	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
		dev_printk(KERN_DEBUG, &device->dev,
			   "host bridge window %pR (ignored)\n", entry->res);
		resource_list_destroy_entry(entry);
	}
	x86_pci_root_bus_resources(busnum, &ci->resources);

	return 0;
}

static struct acpi_pci_root_ops acpi_pci_root_ops = {
	.pci_ops = &pci_root_ops,
	.init_info = pci_acpi_root_init_info,
	.release_info = pci_acpi_root_release_info,
	.prepare_resources = pci_acpi_root_prepare_resources,
};

struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
{
	int domain = root->segment;
	int busnum = root->secondary.start;
	int node = pci_acpi_root_get_node(root);
	struct pci_bus *bus;

	if (pci_ignore_seg)
		root->segment = domain = 0;

	if (domain && !pci_domains_supported) {
		printk(KERN_WARNING "pci_bus %04x:%02x: "
		       "ignored (multiple domains not supported)\n",
		       domain, busnum);
		return NULL;
	}

	bus = pci_find_bus(domain, busnum);
	if (bus) {
		/*
		 * If the desired bus has been scanned already, replace
		 * its bus->sysdata.
		 */
		struct pci_sysdata sd = {
			.domain = domain,
			.node = node,
			.companion = root->device
		};

		memcpy(bus->sysdata, &sd, sizeof(sd));
	} else {
		struct pci_root_info *info;

		info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
		if (!info)
			dev_err(&root->device->dev,
				"pci_bus %04x:%02x: ignored (out of memory)\n",
				domain, busnum);
		else {
			info->sd.domain = domain;
			info->sd.node = node;
			info->sd.companion = root->device;
			bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
						   &info->common, &info->sd);
		}
	}

	/* After the PCI-E bus has been walked and all devices discovered,
	 * configure any settings of the fabric that might be necessary.
	 */
	if (bus) {
		struct pci_bus *child;
		list_for_each_entry(child, &bus->children, node)
			pcie_bus_configure_settings(child);
	}

	return bus;
}

int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
	/*
	 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
	 * here, pci_create_root_bus() has been called by someone else and
	 * sysdata is likely to be different from what we expect.  Let it go in
	 * that case.
	 */
	if (!bridge->dev.parent) {
		struct pci_sysdata *sd = bridge->bus->sysdata;
		ACPI_COMPANION_SET(&bridge->dev, sd->companion);
	}
	return 0;
}

int __init pci_acpi_init(void)
{
	struct pci_dev *dev = NULL;

	if (acpi_noirq)
		return -ENODEV;

	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
	acpi_irq_penalty_init();
	pcibios_enable_irq = acpi_pci_irq_enable;
	pcibios_disable_irq = acpi_pci_irq_disable;
	x86_init.pci.init_irq = x86_init_noop;

	if (pci_routeirq) {
		/*
		 * PCI IRQ routing is set up by pci_enable_device(), but we
		 * also do it here in case there are still broken drivers that
		 * don't use pci_enable_device().
		 */
		printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
		for_each_pci_dev(dev)
			acpi_pci_irq_enable(dev);
	}

	return 0;
}