[mirror_ubuntu-focal-kernel.git] / arch / x86 / pci / acpi.c

#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <asm/numa.h>
#include <asm/pci_x86.h>

struct pci_root_info {
	struct acpi_device *bridge;
	char *name;
	unsigned int res_num;
	struct resource *res;
	struct pci_bus *bus;
	int busnum;
};

static acpi_status
resource_to_addr(struct acpi_resource *resource,
			struct acpi_resource_address64 *addr)
{
	acpi_status status;

	status = acpi_resource_to_address64(resource, addr);
	if (ACPI_SUCCESS(status) &&
	    (addr->resource_type == ACPI_MEMORY_RANGE ||
	    addr->resource_type == ACPI_IO_RANGE) &&
	    addr->address_length > 0 &&
	    addr->producer_consumer == ACPI_PRODUCER) {
		return AE_OK;
	}
	return AE_ERROR;
}

static acpi_status
count_resource(struct acpi_resource *acpi_res, void *data)
{
	struct pci_root_info *info = data;
	struct acpi_resource_address64 addr;
	acpi_status status;

	status = resource_to_addr(acpi_res, &addr);
	if (ACPI_SUCCESS(status))
		info->res_num++;
	return AE_OK;
}

static int
bus_has_transparent_bridge(struct pci_bus *bus)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		u16 class = dev->class >> 8;

		if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent)
			return true;
	}
	return false;
}

static acpi_status
setup_resource(struct acpi_resource *acpi_res, void *data)
{
	struct pci_root_info *info = data;
	struct resource *res;
	struct acpi_resource_address64 addr;
	acpi_status status;
	unsigned long flags;
	struct resource *root;
	int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
	u64 start, end;

	if (bus_has_transparent_bridge(info->bus))
		max_root_bus_resources -= 3;

	status = resource_to_addr(acpi_res, &addr);
	if (!ACPI_SUCCESS(status))
		return AE_OK;

	if (addr.resource_type == ACPI_MEMORY_RANGE) {
		root = &iomem_resource;
		flags = IORESOURCE_MEM;
		if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
			flags |= IORESOURCE_PREFETCH;
	} else if (addr.resource_type == ACPI_IO_RANGE) {
		root = &ioport_resource;
		flags = IORESOURCE_IO;
	} else
		return AE_OK;

	start = addr.minimum + addr.translation_offset;
	end = start + addr.address_length - 1;
	if (info->res_num >= max_root_bus_resources) {
		printk(KERN_WARNING "PCI: Failed to allocate 0x%lx-0x%lx "
			"from %s for %s due to _CRS returning more than "
			"%d resource descriptors\n", (unsigned long) start,
			(unsigned long) end, root->name, info->name,
			max_root_bus_resources);
		return AE_OK;
	}

	res = &info->res[info->res_num];
	res->name = info->name;
	res->flags = flags;
	res->start = start;
	res->end = end;
	res->child = NULL;

	if (insert_resource(root, res)) {
		dev_err(&info->bridge->dev,
			"can't allocate host bridge window %pR\n", res);
	} else {
		info->bus->resource[info->res_num] = res;
		info->res_num++;
		if (addr.translation_offset)
			dev_info(&info->bridge->dev, "host bridge window %pR "
				 "(PCI address [%#llx-%#llx])\n",
				 res, res->start - addr.translation_offset,
				 res->end - addr.translation_offset);
		else
			dev_info(&info->bridge->dev,
				 "host bridge window %pR\n", res);
	}
	return AE_OK;
}

static void
get_current_resources(struct acpi_device *device, int busnum,
			int domain, struct pci_bus *bus)
{
	struct pci_root_info info;
	size_t size;

	info.bridge = device;
	info.bus = bus;
	info.res_num = 0;
	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
				&info);
	if (!info.res_num)
		return;

	size = sizeof(*info.res) * info.res_num;
	info.res = kmalloc(size, GFP_KERNEL);
	if (!info.res)
		goto res_alloc_fail;

	info.name = kmalloc(16, GFP_KERNEL);
	if (!info.name)
		goto name_alloc_fail;
	sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);

	info.res_num = 0;
	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
				&info);

	return;

name_alloc_fail:
	kfree(info.res);
res_alloc_fail:
	return;
}

struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
{
	struct pci_bus *bus;
	struct pci_sysdata *sd;
	int node;
#ifdef CONFIG_ACPI_NUMA
	int pxm;
#endif

	if (domain && !pci_domains_supported) {
		printk(KERN_WARNING "PCI: Multiple domains not supported "
		       "(dom %d, bus %d)\n", domain, busnum);
		return NULL;
	}

	node = -1;
#ifdef CONFIG_ACPI_NUMA
	pxm = acpi_get_pxm(device->handle);
	if (pxm >= 0)
		node = pxm_to_node(pxm);
	if (node != -1)
		set_mp_bus_to_node(busnum, node);
	else
#endif
		node = get_mp_bus_to_node(busnum);

	if (node != -1 && !node_online(node))
		node = -1;

	/* Allocate per-root-bus (not per bus) arch-specific data.
	 * TODO: leak; this memory is never freed.
	 * It's arguable whether it's worth the trouble to care.
	 */
	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
	if (!sd) {
		printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
		return NULL;
	}

	sd->domain = domain;
	sd->node = node;
	/*
	 * Maybe the desired pci bus has been already scanned. In such case
	 * it is unnecessary to scan the pci bus with the given domain,busnum.
	 */
	bus = pci_find_bus(domain, busnum);
	if (bus) {
		/*
		 * If the desired bus exits, the content of bus->sysdata will
		 * be replaced by sd.
		 */
		memcpy(bus->sysdata, sd, sizeof(*sd));
		kfree(sd);
	} else {
		bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
		if (bus) {
			if (pci_probe & PCI_USE__CRS)
				get_current_resources(device, busnum, domain,
							bus);
			bus->subordinate = pci_scan_child_bus(bus);
		}
	}

	if (!bus)
		kfree(sd);

	if (bus && node != -1) {
#ifdef CONFIG_ACPI_NUMA
		if (pxm >= 0)
			dev_printk(KERN_DEBUG, &bus->dev,
				   "on NUMA node %d (pxm %d)\n", node, pxm);
#else
		dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
#endif
	}

	return bus;
}

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

	if (pcibios_scanned)
		return 0;

	if (acpi_noirq)
		return 0;

	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
	acpi_irq_penalty_init();
	pcibios_scanned++;
	pcibios_enable_irq = acpi_pci_irq_enable;
	pcibios_disable_irq = acpi_pci_irq_disable;

	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;
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/pci.h>
	2	#include <linux/acpi.h>
	3	#include <linux/init.h>
b33fa1f3	4	#include <linux/irq.h>
036fff4c	5	#include <linux/dmi.h>
69e1a33f	6	#include <asm/numa.h>
82487711	7	#include <asm/pci_x86.h>
1da177e4	8
62f420f8	9	struct pci_root_info {
42887b29	10	struct acpi_device *bridge;
62f420f8 GH	11	char *name;
	12	unsigned int res_num;
	13	struct resource *res;
	14	struct pci_bus *bus;
	15	int busnum;
	16	};
	17
	18	static acpi_status
	19	resource_to_addr(struct acpi_resource *resource,
	20	struct acpi_resource_address64 *addr)
	21	{
	22	acpi_status status;
	23
	24	status = acpi_resource_to_address64(resource, addr);
	25	if (ACPI_SUCCESS(status) &&
	26	(addr->resource_type == ACPI_MEMORY_RANGE \|\|
	27	addr->resource_type == ACPI_IO_RANGE) &&
	28	addr->address_length > 0 &&
	29	addr->producer_consumer == ACPI_PRODUCER) {
	30	return AE_OK;
	31	}
	32	return AE_ERROR;
	33	}
	34
	35	static acpi_status
	36	count_resource(struct acpi_resource acpi_res, void data)
	37	{
	38	struct pci_root_info *info = data;
	39	struct acpi_resource_address64 addr;
	40	acpi_status status;
	41
	42	status = resource_to_addr(acpi_res, &addr);
	43	if (ACPI_SUCCESS(status))
	44	info->res_num++;
	45	return AE_OK;
	46	}
	47
f9cde5ff GH	48	static int
	49	bus_has_transparent_bridge(struct pci_bus *bus)
	50	{
	51	struct pci_dev *dev;
	52
	53	list_for_each_entry(dev, &bus->devices, bus_list) {
	54	u16 class = dev->class >> 8;
	55
	56	if (class == PCI_CLASS_BRIDGE_PCI && dev->transparent)
	57	return true;
	58	}
	59	return false;
	60	}
	61
62f420f8 GH	62	static acpi_status
	63	setup_resource(struct acpi_resource acpi_res, void data)
	64	{
	65	struct pci_root_info *info = data;
	66	struct resource *res;
	67	struct acpi_resource_address64 addr;
	68	acpi_status status;
	69	unsigned long flags;
	70	struct resource *root;
f9cde5ff	71	int max_root_bus_resources = PCI_BUS_NUM_RESOURCES;
2cdb3f1d YL	72	u64 start, end;
	73
	74	if (bus_has_transparent_bridge(info->bus))
	75	max_root_bus_resources -= 3;
3d9befd2	76
62f420f8 GH	77	status = resource_to_addr(acpi_res, &addr);
	78	if (!ACPI_SUCCESS(status))
	79	return AE_OK;
	80
	81	if (addr.resource_type == ACPI_MEMORY_RANGE) {
	82	root = &iomem_resource;
	83	flags = IORESOURCE_MEM;
	84	if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
	85	flags \|= IORESOURCE_PREFETCH;
	86	} else if (addr.resource_type == ACPI_IO_RANGE) {
	87	root = &ioport_resource;
	88	flags = IORESOURCE_IO;
	89	} else
	90	return AE_OK;
	91
2cdb3f1d YL	92	start = addr.minimum + addr.translation_offset;
2cdb3f1d YL	93	end = start + addr.address_length - 1;
f9cde5ff GH	94	if (info->res_num >= max_root_bus_resources) {
	95	printk(KERN_WARNING "PCI: Failed to allocate 0x%lx-0x%lx "
	96	"from %s for %s due to _CRS returning more than "
2cdb3f1d YL	97	"%d resource descriptors\n", (unsigned long) start,
2cdb3f1d YL	98	(unsigned long) end, root->name, info->name,
f9cde5ff	99	max_root_bus_resources);
f9cde5ff GH	100	return AE_OK;
	101	}
	102
2cdb3f1d YL	103	res = &info->res[info->res_num];
	104	res->name = info->name;
	105	res->flags = flags;
	106	res->start = start;
	107	res->end = end;
	108	res->child = NULL;
	109
62f420f8	110	if (insert_resource(root, res)) {
c7dabef8 BH	111	dev_err(&info->bridge->dev,
c7dabef8 BH	112	"can't allocate host bridge window %pR\n", res);
62f420f8 GH	113	} else {
	114	info->bus->resource[info->res_num] = res;
	115	info->res_num++;
42887b29	116	if (addr.translation_offset)
c7dabef8	117	dev_info(&info->bridge->dev, "host bridge window %pR "
42887b29 BH	118	"(PCI address [%#llx-%#llx])\n",
	119	res, res->start - addr.translation_offset,
	120	res->end - addr.translation_offset);
	121	else
	122	dev_info(&info->bridge->dev,
c7dabef8	123	"host bridge window %pR\n", res);
62f420f8 GH	124	}
	125	return AE_OK;
	126	}
	127
62f420f8 GH	128	static void
62f420f8 GH	129	get_current_resources(struct acpi_device *device, int busnum,
cb3576fa	130	int domain, struct pci_bus *bus)
62f420f8 GH	131	{
	132	struct pci_root_info info;
	133	size_t size;
	134
42887b29	135	info.bridge = device;
62f420f8 GH	136	info.bus = bus;
	137	info.res_num = 0;
	138	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
	139	&info);
	140	if (!info.res_num)
	141	return;
	142
	143	size = sizeof(info.res) info.res_num;
	144	info.res = kmalloc(size, GFP_KERNEL);
	145	if (!info.res)
	146	goto res_alloc_fail;
	147
cb3576fa	148	info.name = kmalloc(16, GFP_KERNEL);
62f420f8 GH	149	if (!info.name)
62f420f8 GH	150	goto name_alloc_fail;
cb3576fa	151	sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
62f420f8 GH	152
	153	info.res_num = 0;
	154	acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
	155	&info);
62f420f8 GH	156
	157	return;
	158
	159	name_alloc_fail:
	160	kfree(info.res);
	161	res_alloc_fail:
	162	return;
	163	}
	164
1da177e4 LT	165	struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
1da177e4 LT	166	{
69e1a33f	167	struct pci_bus *bus;
08f1c192	168	struct pci_sysdata *sd;
871d5f8d YL	169	int node;
871d5f8d YL	170	#ifdef CONFIG_ACPI_NUMA
08f1c192	171	int pxm;
871d5f8d	172	#endif
08f1c192	173
a79e4198 JG	174	if (domain && !pci_domains_supported) {
	175	printk(KERN_WARNING "PCI: Multiple domains not supported "
	176	"(dom %d, bus %d)\n", domain, busnum);
	177	return NULL;
	178	}
	179
871d5f8d YL	180	node = -1;
	181	#ifdef CONFIG_ACPI_NUMA
	182	pxm = acpi_get_pxm(device->handle);
	183	if (pxm >= 0)
	184	node = pxm_to_node(pxm);
	185	if (node != -1)
	186	set_mp_bus_to_node(busnum, node);
	187	else
871d5f8d	188	#endif
871d5f8d	189	node = get_mp_bus_to_node(busnum);
b755de8d YL	190
	191	if (node != -1 && !node_online(node))
	192	node = -1;
871d5f8d	193
08f1c192 MBY	194	/* Allocate per-root-bus (not per bus) arch-specific data.
	195	* TODO: leak; this memory is never freed.
	196	* It's arguable whether it's worth the trouble to care.
	197	*/
	198	sd = kzalloc(sizeof(*sd), GFP_KERNEL);
	199	if (!sd) {
	200	printk(KERN_ERR "PCI: OOM, not probing PCI bus %02x\n", busnum);
	201	return NULL;
	202	}
69e1a33f	203
a79e4198	204	sd->domain = domain;
871d5f8d	205	sd->node = node;
b87e81e5	206	/*
	207	* Maybe the desired pci bus has been already scanned. In such case
	208	* it is unnecessary to scan the pci bus with the given domain,busnum.
	209	*/
	210	bus = pci_find_bus(domain, busnum);
	211	if (bus) {
	212	/*
	213	* If the desired bus exits, the content of bus->sysdata will
	214	* be replaced by sd.
	215	*/
	216	memcpy(bus->sysdata, sd, sizeof(*sd));
	217	kfree(sd);
626fdfec YL	218	} else {
	219	bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
	220	if (bus) {
	221	if (pci_probe & PCI_USE__CRS)
	222	get_current_resources(device, busnum, domain,
	223	bus);
	224	bus->subordinate = pci_scan_child_bus(bus);
	225	}
	226	}
08f1c192	227
08f1c192 MBY	228	if (!bus)
	229	kfree(sd);
	230
dbb6152e	231	if (bus && node != -1) {
69e1a33f	232	#ifdef CONFIG_ACPI_NUMA
dbb6152e	233	if (pxm >= 0)
2b8c2efe BH	234	dev_printk(KERN_DEBUG, &bus->dev,
2b8c2efe BH	235	"on NUMA node %d (pxm %d)\n", node, pxm);
dbb6152e	236	#else
2b8c2efe	237	dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
69e1a33f	238	#endif
dbb6152e	239	}
62f420f8	240
69e1a33f	241	return bus;
1da177e4 LT	242	}
1da177e4 LT	243
8dd779b1	244	int __init pci_acpi_init(void)
1da177e4 LT	245	{
	246	struct pci_dev *dev = NULL;
	247
	248	if (pcibios_scanned)
	249	return 0;
	250
	251	if (acpi_noirq)
	252	return 0;
	253
	254	printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
	255	acpi_irq_penalty_init();
	256	pcibios_scanned++;
	257	pcibios_enable_irq = acpi_pci_irq_enable;
87bec66b	258	pcibios_disable_irq = acpi_pci_irq_disable;
1da177e4 LT	259
	260	if (pci_routeirq) {
	261	/*
	262	* PCI IRQ routing is set up by pci_enable_device(), but we
	263	* also do it here in case there are still broken drivers that
	264	* don't use pci_enable_device().
	265	*/
	266	printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
fb37fb96	267	for_each_pci_dev(dev)
1da177e4	268	acpi_pci_irq_enable(dev);
657472e9	269	}
1da177e4	270
1da177e4 LT	271	return 0;
1da177e4 LT	272	}