From 593669c2ac0fe18baee04a3cd5539a148aa48574 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Thu, 5 Feb 2015 13:44:46 +0800 Subject: [PATCH] x86/PCI/ACPI: Use common ACPI resource interfaces to simplify implementation Use common ACPI resource discovery interfaces to simplify PCI host bridge resource enumeration. Signed-off-by: Jiang Liu Acked-by: Bjorn Helgaas Signed-off-by: Rafael J. Wysocki --- arch/x86/pci/acpi.c | 295 ++++++++++++++------------------------------ 1 file changed, 91 insertions(+), 204 deletions(-) diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c index 1d725d99963d..6ac273832f28 100644 --- a/arch/x86/pci/acpi.c +++ b/arch/x86/pci/acpi.c @@ -10,9 +10,6 @@ struct pci_root_info { struct acpi_device *bridge; char name[16]; - unsigned int res_num; - struct resource *res; - resource_size_t *res_offset; struct pci_sysdata sd; #ifdef CONFIG_PCI_MMCONFIG bool mcfg_added; @@ -218,132 +215,41 @@ static void teardown_mcfg_map(struct pci_root_info *info) } #endif -static acpi_status resource_to_addr(struct acpi_resource *resource, - struct acpi_resource_address64 *addr) -{ - acpi_status status; - struct acpi_resource_memory24 *memory24; - struct acpi_resource_memory32 *memory32; - struct acpi_resource_fixed_memory32 *fixed_memory32; - - memset(addr, 0, sizeof(*addr)); - switch (resource->type) { - case ACPI_RESOURCE_TYPE_MEMORY24: - memory24 = &resource->data.memory24; - addr->resource_type = ACPI_MEMORY_RANGE; - addr->address.minimum = memory24->minimum; - addr->address.address_length = memory24->address_length; - addr->address.maximum = addr->address.minimum + addr->address.address_length - 1; - return AE_OK; - case ACPI_RESOURCE_TYPE_MEMORY32: - memory32 = &resource->data.memory32; - addr->resource_type = ACPI_MEMORY_RANGE; - addr->address.minimum = memory32->minimum; - addr->address.address_length = memory32->address_length; - addr->address.maximum = addr->address.minimum + addr->address.address_length - 1; - return AE_OK; - case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: - fixed_memory32 = &resource->data.fixed_memory32; - addr->resource_type = ACPI_MEMORY_RANGE; - addr->address.minimum = fixed_memory32->address; - addr->address.address_length = fixed_memory32->address_length; - addr->address.maximum = addr->address.minimum + addr->address.address_length - 1; - return AE_OK; - case ACPI_RESOURCE_TYPE_ADDRESS16: - case ACPI_RESOURCE_TYPE_ADDRESS32: - case ACPI_RESOURCE_TYPE_ADDRESS64: - 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 > 0) { - return AE_OK; - } - break; - } - return AE_ERROR; -} - -static acpi_status count_resource(struct acpi_resource *acpi_res, void *data) +static void validate_resources(struct device *dev, struct list_head *crs_res, + unsigned long type) { - 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 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; - u64 start, orig_end, end, res_end; - - status = resource_to_addr(acpi_res, &addr); - if (!ACPI_SUCCESS(status)) - return AE_OK; - - if (addr.resource_type == ACPI_MEMORY_RANGE) { - flags = IORESOURCE_MEM; - if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY) - flags |= IORESOURCE_PREFETCH; - res_end = (u64)iomem_resource.end; - } else if (addr.resource_type == ACPI_IO_RANGE) { - flags = IORESOURCE_IO; - res_end = (u64)ioport_resource.end; - } else - return AE_OK; - - start = addr.address.minimum + addr.address.translation_offset; - orig_end = end = addr.address.maximum + addr.address.translation_offset; - - /* Exclude non-addressable range or non-addressable portion of range */ - end = min(end, res_end); - if (end <= start) { - dev_info(&info->bridge->dev, - "host bridge window [%#llx-%#llx] " - "(ignored, not CPU addressable)\n", start, orig_end); - return AE_OK; - } else if (orig_end != end) { - dev_info(&info->bridge->dev, - "host bridge window [%#llx-%#llx] " - "([%#llx-%#llx] ignored, not CPU addressable)\n", - start, orig_end, end + 1, orig_end); - } + LIST_HEAD(list); + struct resource *res1, *res2, *root = NULL; + struct resource_entry *tmp, *entry, *entry2; - res = &info->res[info->res_num]; - res->name = info->name; - res->flags = flags; - res->start = start; - res->end = end; - info->res_offset[info->res_num] = addr.address.translation_offset; - info->res_num++; + BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0); + root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; - if (!pci_use_crs) - dev_printk(KERN_DEBUG, &info->bridge->dev, - "host bridge window %pR (ignored)\n", res); + list_splice_init(crs_res, &list); + resource_list_for_each_entry_safe(entry, tmp, &list) { + bool free = false; + resource_size_t end; - return AE_OK; -} - -static void coalesce_windows(struct pci_root_info *info, unsigned long type) -{ - int i, j; - struct resource *res1, *res2; - - for (i = 0; i < info->res_num; i++) { - res1 = &info->res[i]; + res1 = entry->res; if (!(res1->flags & type)) - continue; + 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; + } - for (j = i + 1; j < info->res_num; j++) { - res2 = &info->res[j]; + resource_list_for_each_entry(entry2, crs_res) { + res2 = entry2->res; if (!(res2->flags & type)) continue; @@ -355,118 +261,92 @@ static void coalesce_windows(struct pci_root_info *info, unsigned long type) if (resource_overlaps(res1, res2)) { res2->start = min(res1->start, res2->start); res2->end = max(res1->end, res2->end); - dev_info(&info->bridge->dev, - "host bridge window expanded to %pR; %pR ignored\n", + dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n", res2, res1); - res1->flags = 0; + free = true; + goto next; } } + +next: + resource_list_del(entry); + if (free) + resource_list_free_entry(entry); + else + resource_list_add_tail(entry, crs_res); } } static void add_resources(struct pci_root_info *info, - struct list_head *resources) + struct list_head *resources, + struct list_head *crs_res) { - int i; - struct resource *res, *root, *conflict; - - coalesce_windows(info, IORESOURCE_MEM); - coalesce_windows(info, IORESOURCE_IO); + struct resource_entry *entry, *tmp; + struct resource *res, *conflict, *root = NULL; - for (i = 0; i < info->res_num; i++) { - res = &info->res[i]; + validate_resources(&info->bridge->dev, crs_res, IORESOURCE_MEM); + validate_resources(&info->bridge->dev, crs_res, IORESOURCE_IO); + resource_list_for_each_entry_safe(entry, tmp, crs_res) { + res = entry->res; if (res->flags & IORESOURCE_MEM) root = &iomem_resource; else if (res->flags & IORESOURCE_IO) root = &ioport_resource; else - continue; + BUG_ON(res); conflict = insert_resource_conflict(root, res); - if (conflict) + if (conflict) { dev_info(&info->bridge->dev, "ignoring host bridge window %pR (conflicts with %s %pR)\n", res, conflict->name, conflict); - else - pci_add_resource_offset(resources, res, - info->res_offset[i]); + resource_list_destroy_entry(entry); + } } -} -static void free_pci_root_info_res(struct pci_root_info *info) -{ - kfree(info->res); - info->res = NULL; - kfree(info->res_offset); - info->res_offset = NULL; - info->res_num = 0; + list_splice_tail(crs_res, resources); } -static void __release_pci_root_info(struct pci_root_info *info) +static void release_pci_root_info(struct pci_host_bridge *bridge) { - int i; struct resource *res; + struct resource_entry *entry; + struct pci_root_info *info = bridge->release_data; - 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(entry, &bridge->windows) { + res = entry->res; + if (res->parent && + (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) + release_resource(res); } - free_pci_root_info_res(info); - teardown_mcfg_map(info); - kfree(info); } -static void release_pci_root_info(struct pci_host_bridge *bridge) -{ - struct pci_root_info *info = bridge->release_data; - - __release_pci_root_info(info); -} - static void probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device, - int busnum, int domain) + int busnum, int domain, + struct list_head *list) { - size_t size; + int ret; + struct resource_entry *entry; sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum); info->bridge = device; - - 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 = kzalloc_node(size, GFP_KERNEL, info->sd.node); - if (!info->res) { - info->res_num = 0; - return; - } - - size = sizeof(*info->res_offset) * info->res_num; - info->res_num = 0; - info->res_offset = kzalloc_node(size, GFP_KERNEL, info->sd.node); - if (!info->res_offset) { - kfree(info->res); - info->res = NULL; - return; - } - - acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource, - info); + 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(entry, list) + entry->res->name = info->name; } struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) @@ -475,6 +355,8 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) struct pci_root_info *info; int domain = root->segment; int busnum = root->secondary.start; + struct resource_entry *res_entry; + LIST_HEAD(crs_res); LIST_HEAD(resources); struct pci_bus *bus; struct pci_sysdata *sd; @@ -522,18 +404,22 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) memcpy(bus->sysdata, sd, sizeof(*sd)); kfree(info); } else { - probe_pci_root_info(info, device, busnum, domain); - /* insert busn res at first */ pci_add_resource(&resources, &root->secondary); + /* * _CRS with no apertures is normal, so only fall back to * defaults or native bridge info if we're ignoring _CRS. */ - if (pci_use_crs) - add_resources(info, &resources); - else { - free_pci_root_info_res(info); + probe_pci_root_info(info, device, busnum, domain, &crs_res); + if (pci_use_crs) { + add_resources(info, &resources, &crs_res); + } else { + resource_list_for_each_entry(res_entry, &crs_res) + dev_printk(KERN_DEBUG, &device->dev, + "host bridge window %pR (ignored)\n", + res_entry->res); + resource_list_free(&crs_res); x86_pci_root_bus_resources(busnum, &resources); } @@ -548,8 +434,9 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) to_pci_host_bridge(bus->bridge), release_pci_root_info, info); } else { - pci_free_resource_list(&resources); - __release_pci_root_info(info); + resource_list_free(&resources); + teardown_mcfg_map(info); + kfree(info); } } -- 2.34.1