.write = pci_write,
};
-/* Called by ACPI when it finds a new root bus. */
-
-static struct pci_controller *alloc_pci_controller(int seg)
-{
- struct pci_controller *controller;
-
- controller = kzalloc(sizeof(*controller), GFP_KERNEL);
- if (!controller)
- return NULL;
-
- controller->segment = seg;
- return controller;
-}
-
struct pci_root_info {
+ struct pci_controller controller;
struct acpi_device *bridge;
- struct pci_controller *controller;
struct list_head resources;
- struct resource *res;
- resource_size_t *res_offset;
- unsigned int res_num;
struct list_head io_resources;
- char *name;
+ char name[16];
};
static unsigned int
return i;
}
-static u64 add_io_space(struct pci_root_info *info,
- struct acpi_resource_address64 *addr)
+static int add_io_space(struct device *dev, struct pci_root_info *info,
+ struct resource_entry *entry)
{
struct iospace_resource *iospace;
- struct resource *resource;
+ struct resource *resource, *res = entry->res;
char *name;
unsigned long base, min, max, base_port;
unsigned int sparse = 0, space_nr, len;
len = strlen(info->name) + 32;
iospace = kzalloc(sizeof(*iospace) + len, GFP_KERNEL);
if (!iospace) {
- dev_err(&info->bridge->dev,
- "PCI: No memory for %s I/O port space\n",
- info->name);
- goto out;
+ dev_err(dev, "PCI: No memory for %s I/O port space\n",
+ info->name);
+ return -ENOMEM;
}
- name = (char *)(iospace + 1);
-
- min = addr->address.minimum;
- max = min + addr->address.address_length - 1;
- if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
+ if (res->flags & IORESOURCE_IO_SPARSE)
sparse = 1;
-
- space_nr = new_space(addr->address.translation_offset, sparse);
+ space_nr = new_space(entry->offset, sparse);
if (space_nr == ~0)
goto free_resource;
+ name = (char *)(iospace + 1);
+ min = res->start - entry->offset;
+ max = res->end - entry->offset;
base = __pa(io_space[space_nr].mmio_base);
base_port = IO_SPACE_BASE(space_nr);
snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
- base_port + min, base_port + max);
+ base_port + min, base_port + max);
/*
* The SDM guarantees the legacy 0-64K space is sparse, but if the
resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
resource->end = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
if (insert_resource(&iomem_resource, resource)) {
- dev_err(&info->bridge->dev,
- "can't allocate host bridge io space resource %pR\n",
- resource);
+ dev_err(dev,
+ "can't allocate host bridge io space resource %pR\n",
+ resource);
goto free_resource;
}
+ entry->offset = base_port;
+ res->start = min + base_port;
+ res->end = max + base_port;
list_add_tail(&iospace->list, &info->io_resources);
- return base_port;
+
+ return 0;
free_resource:
kfree(iospace);
-out:
- return ~0;
+ return -ENOSPC;
+}
+
+/*
+ * 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 acpi_status resource_to_window(struct acpi_resource *resource,
- struct acpi_resource_address64 *addr)
+static int
+probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
+ int busnum, int domain)
{
- acpi_status status;
+ int ret;
+ struct list_head *list = &info->resources;
+ struct resource_entry *entry, *tmp;
- /*
- * We're only interested in _CRS descriptors that are
- * - address space descriptors for memory or I/O space
- * - non-zero size
- */
- 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.address_length)
- return AE_OK;
-
- return AE_ERROR;
-}
-
-static acpi_status count_window(struct acpi_resource *resource, void *data)
-{
- unsigned int *windows = (unsigned int *) data;
- struct acpi_resource_address64 addr;
- acpi_status status;
-
- status = resource_to_window(resource, &addr);
- if (ACPI_SUCCESS(status))
- (*windows)++;
-
- return AE_OK;
-}
-
-static acpi_status add_window(struct acpi_resource *res, void *data)
-{
- struct pci_root_info *info = data;
- struct resource *resource;
- struct acpi_resource_address64 addr;
- acpi_status status;
- unsigned long flags, offset = 0;
- struct resource *root;
-
- /* Return AE_OK for non-window resources to keep scanning for more */
- status = resource_to_window(res, &addr);
- if (!ACPI_SUCCESS(status))
- return AE_OK;
-
- if (addr.resource_type == ACPI_MEMORY_RANGE) {
- flags = IORESOURCE_MEM;
- root = &iomem_resource;
- offset = addr.address.translation_offset;
- } else if (addr.resource_type == ACPI_IO_RANGE) {
- flags = IORESOURCE_IO;
- root = &ioport_resource;
- offset = add_io_space(info, &addr);
- if (offset == ~0)
- return AE_OK;
- } else
- return AE_OK;
-
- resource = &info->res[info->res_num];
- resource->name = info->name;
- resource->flags = flags;
- resource->start = addr.address.minimum + offset;
- resource->end = resource->start + addr.address.address_length - 1;
- info->res_offset[info->res_num] = offset;
-
- if (insert_resource(root, resource)) {
- dev_err(&info->bridge->dev,
- "can't allocate host bridge window %pR\n",
- resource);
- } else {
- if (offset)
- dev_info(&info->bridge->dev, "host bridge window %pR "
- "(PCI address [%#llx-%#llx])\n",
- resource,
- resource->start - offset,
- resource->end - offset);
- else
- dev_info(&info->bridge->dev,
- "host bridge window %pR\n", resource);
- }
- /* HP's firmware has a hack to work around a Windows bug.
- * Ignore these tiny memory ranges */
- if (!((resource->flags & IORESOURCE_MEM) &&
- (resource->end - resource->start < 16)))
- pci_add_resource_offset(&info->resources, resource,
- info->res_offset[info->res_num]);
+ ret = acpi_dev_get_resources(device, list,
+ acpi_dev_filter_resource_type_cb,
+ (void *)(IORESOURCE_IO | IORESOURCE_MEM));
+ if (ret < 0)
+ dev_warn(&device->dev,
+ "failed to parse _CRS method, error code %d\n", ret);
+ else if (ret == 0)
+ dev_dbg(&device->dev,
+ "no IO and memory resources present in _CRS\n");
+ else
+ resource_list_for_each_entry_safe(entry, tmp, list) {
+ if ((entry->res->flags & IORESOURCE_DISABLED) ||
+ resource_is_pcicfg_ioport(entry->res))
+ resource_list_destroy_entry(entry);
+ else
+ entry->res->name = info->name;
+ }
- info->res_num++;
- return AE_OK;
+ return ret;
}
-static void free_pci_root_info_res(struct pci_root_info *info)
-{
- struct iospace_resource *iospace, *tmp;
+static void validate_resources(struct device *dev, struct list_head *resources,
+ unsigned long type)
+{
+ LIST_HEAD(list);
+ struct resource *res1, *res2, *root = NULL;
+ struct resource_entry *tmp, *entry, *entry2;
+
+ BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
+ root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
+
+ list_splice_init(resources, &list);
+ resource_list_for_each_entry_safe(entry, tmp, &list) {
+ bool free = false;
+ resource_size_t end;
+
+ res1 = entry->res;
+ if (!(res1->flags & type))
+ goto next;
+
+ /* Exclude non-addressable range or non-addressable portion */
+ end = min(res1->end, root->end);
+ if (end <= res1->start) {
+ dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
+ res1);
+ free = true;
+ goto next;
+ } else if (res1->end != end) {
+ dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
+ res1, (unsigned long long)end + 1,
+ (unsigned long long)res1->end);
+ res1->end = end;
+ }
- list_for_each_entry_safe(iospace, tmp, &info->io_resources, list)
- kfree(iospace);
+ resource_list_for_each_entry(entry2, resources) {
+ res2 = entry2->res;
+ if (!(res2->flags & type))
+ continue;
+
+ /*
+ * I don't like throwing away windows because then
+ * our resources no longer match the ACPI _CRS, but
+ * the kernel resource tree doesn't allow overlaps.
+ */
+ if (resource_overlaps(res1, res2)) {
+ res2->start = min(res1->start, res2->start);
+ res2->end = max(res1->end, res2->end);
+ dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
+ res2, res1);
+ free = true;
+ goto next;
+ }
+ }
- kfree(info->name);
- kfree(info->res);
- info->res = NULL;
- kfree(info->res_offset);
- info->res_offset = NULL;
- info->res_num = 0;
- kfree(info->controller);
- info->controller = NULL;
+next:
+ resource_list_del(entry);
+ if (free)
+ resource_list_free_entry(entry);
+ else
+ resource_list_add_tail(entry, resources);
+ }
+}
+
+static void add_resources(struct pci_root_info *info, struct device *dev)
+{
+ struct resource_entry *entry, *tmp;
+ struct resource *res, *conflict, *root = NULL;
+ struct list_head *list = &info->resources;
+
+ validate_resources(dev, list, IORESOURCE_MEM);
+ validate_resources(dev, list, IORESOURCE_IO);
+
+ resource_list_for_each_entry_safe(entry, tmp, list) {
+ res = entry->res;
+ if (res->flags & IORESOURCE_MEM) {
+ root = &iomem_resource;
+ /*
+ * HP's firmware has a hack to work around a Windows
+ * bug. Ignore these tiny memory ranges.
+ */
+ if (resource_size(res) <= 16) {
+ resource_list_destroy_entry(entry);
+ continue;
+ }
+ } else if (res->flags & IORESOURCE_IO) {
+ root = &ioport_resource;
+ if (add_io_space(&info->bridge->dev, info, entry)) {
+ resource_list_destroy_entry(entry);
+ continue;
+ }
+ } else {
+ BUG_ON(res);
+ }
+
+ conflict = insert_resource_conflict(root, res);
+ if (conflict) {
+ dev_info(dev,
+ "ignoring host bridge window %pR (conflicts with %s %pR)\n",
+ res, conflict->name, conflict);
+ resource_list_destroy_entry(entry);
+ }
+ }
}
static void __release_pci_root_info(struct pci_root_info *info)
{
- int i;
struct resource *res;
- struct iospace_resource *iospace;
+ struct iospace_resource *iospace, *tmp;
+ struct resource_entry *entry, *tentry;
- list_for_each_entry(iospace, &info->io_resources, list)
+ list_for_each_entry_safe(iospace, tmp, &info->io_resources, list) {
release_resource(&iospace->res);
+ kfree(iospace);
+ }
- for (i = 0; i < info->res_num; i++) {
- res = &info->res[i];
-
- if (!res->parent)
- continue;
-
- if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
- continue;
-
- release_resource(res);
+ resource_list_for_each_entry_safe(entry, tentry, &info->resources) {
+ res = entry->res;
+ if (res->parent &&
+ (res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
+ release_resource(res);
+ resource_list_destroy_entry(entry);
}
- free_pci_root_info_res(info);
kfree(info);
}
__release_pci_root_info(info);
}
-static int
-probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
- int busnum, int domain)
-{
- char *name;
-
- name = kmalloc(16, GFP_KERNEL);
- if (!name)
- return -ENOMEM;
-
- sprintf(name, "PCI Bus %04x:%02x", domain, busnum);
- info->bridge = device;
- info->name = name;
-
- acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
- &info->res_num);
- if (info->res_num) {
- info->res =
- kzalloc_node(sizeof(*info->res) * info->res_num,
- GFP_KERNEL, info->controller->node);
- if (!info->res) {
- kfree(name);
- return -ENOMEM;
- }
-
- info->res_offset =
- kzalloc_node(sizeof(*info->res_offset) * info->res_num,
- GFP_KERNEL, info->controller->node);
- if (!info->res_offset) {
- kfree(name);
- kfree(info->res);
- info->res = NULL;
- return -ENOMEM;
- }
-
- info->res_num = 0;
- acpi_walk_resources(device->handle, METHOD_NAME__CRS,
- add_window, info);
- } else
- kfree(name);
-
- return 0;
-}
-
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
{
struct acpi_device *device = root->device;
int domain = root->segment;
int bus = root->secondary.start;
- struct pci_controller *controller;
- struct pci_root_info *info = NULL;
- int busnum = root->secondary.start;
+ struct pci_root_info *info;
struct pci_bus *pbus;
int ret;
- controller = alloc_pci_controller(domain);
- if (!controller)
- return NULL;
-
- controller->companion = device;
- controller->node = acpi_get_node(device->handle);
-
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info) {
dev_err(&device->dev,
- "pci_bus %04x:%02x: ignored (out of memory)\n",
- domain, busnum);
- kfree(controller);
+ "pci_bus %04x:%02x: ignored (out of memory)\n",
+ domain, bus);
return NULL;
}
- info->controller = controller;
- INIT_LIST_HEAD(&info->io_resources);
+ info->controller.segment = domain;
+ info->controller.companion = device;
+ info->controller.node = acpi_get_node(device->handle);
+ info->bridge = device;
INIT_LIST_HEAD(&info->resources);
+ INIT_LIST_HEAD(&info->io_resources);
+ snprintf(info->name, sizeof(info->name),
+ "PCI Bus %04x:%02x", domain, bus);
- ret = probe_pci_root_info(info, device, busnum, domain);
- if (ret) {
- kfree(info->controller);
+ ret = probe_pci_root_info(info, device, bus, domain);
+ if (ret <= 0) {
kfree(info);
return NULL;
}
- /* insert busn resource at first */
+ add_resources(info, &info->bridge->dev);
pci_add_resource(&info->resources, &root->secondary);
+
/*
* See arch/x86/pci/acpi.c.
* The desired pci bus might already be scanned in a quirk. We
* should handle the case here, but it appears that IA64 hasn't
* such quirk. So we just ignore the case now.
*/
- pbus = pci_create_root_bus(NULL, bus, &pci_root_ops, controller,
- &info->resources);
+ pbus = pci_create_root_bus(NULL, bus, &pci_root_ops,
+ &info->controller, &info->resources);
if (!pbus) {
- pci_free_resource_list(&info->resources);
__release_pci_root_info(info);
return NULL;
}
projects / users / willy / pagecache.git / commitdiff