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 <jiang.liu@linux.intel.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jiang Liu
Rafael J. Wysocki
parent
812dbd9994
commit
593669c2ac
@ -10,9 +10,6 @@
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struct pci_root_info {
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struct acpi_device *bridge;
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char name[16];
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unsigned int res_num;
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struct resource *res;
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resource_size_t *res_offset;
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struct pci_sysdata sd;
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#ifdef CONFIG_PCI_MMCONFIG
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bool mcfg_added;
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@ -218,132 +215,41 @@ static void teardown_mcfg_map(struct pci_root_info *info)
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}
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#endif
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static acpi_status resource_to_addr(struct acpi_resource *resource,
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struct acpi_resource_address64 *addr)
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static void validate_resources(struct device *dev, struct list_head *crs_res,
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unsigned long type)
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{
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acpi_status status;
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struct acpi_resource_memory24 *memory24;
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struct acpi_resource_memory32 *memory32;
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struct acpi_resource_fixed_memory32 *fixed_memory32;
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LIST_HEAD(list);
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struct resource *res1, *res2, *root = NULL;
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struct resource_entry *tmp, *entry, *entry2;
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memset(addr, 0, sizeof(*addr));
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switch (resource->type) {
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case ACPI_RESOURCE_TYPE_MEMORY24:
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memory24 = &resource->data.memory24;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->address.minimum = memory24->minimum;
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addr->address.address_length = memory24->address_length;
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addr->address.maximum = addr->address.minimum + addr->address.address_length - 1;
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return AE_OK;
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case ACPI_RESOURCE_TYPE_MEMORY32:
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memory32 = &resource->data.memory32;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->address.minimum = memory32->minimum;
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addr->address.address_length = memory32->address_length;
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addr->address.maximum = addr->address.minimum + addr->address.address_length - 1;
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return AE_OK;
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case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
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fixed_memory32 = &resource->data.fixed_memory32;
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addr->resource_type = ACPI_MEMORY_RANGE;
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addr->address.minimum = fixed_memory32->address;
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addr->address.address_length = fixed_memory32->address_length;
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addr->address.maximum = addr->address.minimum + addr->address.address_length - 1;
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return AE_OK;
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case ACPI_RESOURCE_TYPE_ADDRESS16:
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case ACPI_RESOURCE_TYPE_ADDRESS32:
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case ACPI_RESOURCE_TYPE_ADDRESS64:
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status = acpi_resource_to_address64(resource, addr);
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if (ACPI_SUCCESS(status) &&
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(addr->resource_type == ACPI_MEMORY_RANGE ||
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addr->resource_type == ACPI_IO_RANGE) &&
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addr->address.address_length > 0) {
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return AE_OK;
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}
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break;
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}
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return AE_ERROR;
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}
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BUG_ON((type & (IORESOURCE_MEM | IORESOURCE_IO)) == 0);
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root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;
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static acpi_status count_resource(struct acpi_resource *acpi_res, void *data)
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{
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struct pci_root_info *info = data;
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struct acpi_resource_address64 addr;
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acpi_status status;
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list_splice_init(crs_res, &list);
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resource_list_for_each_entry_safe(entry, tmp, &list) {
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bool free = false;
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resource_size_t end;
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status = resource_to_addr(acpi_res, &addr);
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if (ACPI_SUCCESS(status))
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info->res_num++;
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return AE_OK;
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}
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static acpi_status setup_resource(struct acpi_resource *acpi_res, void *data)
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{
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struct pci_root_info *info = data;
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struct resource *res;
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struct acpi_resource_address64 addr;
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acpi_status status;
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unsigned long flags;
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u64 start, orig_end, end, res_end;
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status = resource_to_addr(acpi_res, &addr);
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if (!ACPI_SUCCESS(status))
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return AE_OK;
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if (addr.resource_type == ACPI_MEMORY_RANGE) {
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flags = IORESOURCE_MEM;
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if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
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flags |= IORESOURCE_PREFETCH;
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res_end = (u64)iomem_resource.end;
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} else if (addr.resource_type == ACPI_IO_RANGE) {
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flags = IORESOURCE_IO;
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res_end = (u64)ioport_resource.end;
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} else
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return AE_OK;
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start = addr.address.minimum + addr.address.translation_offset;
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orig_end = end = addr.address.maximum + addr.address.translation_offset;
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/* Exclude non-addressable range or non-addressable portion of range */
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end = min(end, res_end);
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if (end <= start) {
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dev_info(&info->bridge->dev,
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"host bridge window [%#llx-%#llx] "
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"(ignored, not CPU addressable)\n", start, orig_end);
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return AE_OK;
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} else if (orig_end != end) {
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dev_info(&info->bridge->dev,
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"host bridge window [%#llx-%#llx] "
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"([%#llx-%#llx] ignored, not CPU addressable)\n",
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start, orig_end, end + 1, orig_end);
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}
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res = &info->res[info->res_num];
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res->name = info->name;
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res->flags = flags;
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res->start = start;
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res->end = end;
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info->res_offset[info->res_num] = addr.address.translation_offset;
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info->res_num++;
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if (!pci_use_crs)
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dev_printk(KERN_DEBUG, &info->bridge->dev,
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"host bridge window %pR (ignored)\n", res);
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return AE_OK;
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}
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static void coalesce_windows(struct pci_root_info *info, unsigned long type)
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{
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int i, j;
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struct resource *res1, *res2;
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for (i = 0; i < info->res_num; i++) {
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res1 = &info->res[i];
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res1 = entry->res;
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if (!(res1->flags & type))
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continue;
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goto next;
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for (j = i + 1; j < info->res_num; j++) {
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res2 = &info->res[j];
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/* Exclude non-addressable range or non-addressable portion */
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end = min(res1->end, root->end);
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if (end <= res1->start) {
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dev_info(dev, "host bridge window %pR (ignored, not CPU addressable)\n",
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res1);
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free = true;
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goto next;
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} else if (res1->end != end) {
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dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n",
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res1, (unsigned long long)end + 1,
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(unsigned long long)res1->end);
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res1->end = end;
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}
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resource_list_for_each_entry(entry2, crs_res) {
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res2 = entry2->res;
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if (!(res2->flags & type))
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continue;
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@ -355,118 +261,92 @@ static void coalesce_windows(struct pci_root_info *info, unsigned long type)
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if (resource_overlaps(res1, res2)) {
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res2->start = min(res1->start, res2->start);
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res2->end = max(res1->end, res2->end);
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dev_info(&info->bridge->dev,
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"host bridge window expanded to %pR; %pR ignored\n",
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dev_info(dev, "host bridge window expanded to %pR; %pR ignored\n",
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res2, res1);
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res1->flags = 0;
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free = true;
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goto next;
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}
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}
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next:
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resource_list_del(entry);
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if (free)
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resource_list_free_entry(entry);
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else
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resource_list_add_tail(entry, crs_res);
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}
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}
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static void add_resources(struct pci_root_info *info,
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struct list_head *resources)
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struct list_head *resources,
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struct list_head *crs_res)
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{
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int i;
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struct resource *res, *root, *conflict;
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struct resource_entry *entry, *tmp;
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struct resource *res, *conflict, *root = NULL;
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coalesce_windows(info, IORESOURCE_MEM);
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coalesce_windows(info, IORESOURCE_IO);
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for (i = 0; i < info->res_num; i++) {
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res = &info->res[i];
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validate_resources(&info->bridge->dev, crs_res, IORESOURCE_MEM);
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validate_resources(&info->bridge->dev, crs_res, IORESOURCE_IO);
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resource_list_for_each_entry_safe(entry, tmp, crs_res) {
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res = entry->res;
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if (res->flags & IORESOURCE_MEM)
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root = &iomem_resource;
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else if (res->flags & IORESOURCE_IO)
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root = &ioport_resource;
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else
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continue;
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BUG_ON(res);
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conflict = insert_resource_conflict(root, res);
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if (conflict)
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if (conflict) {
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dev_info(&info->bridge->dev,
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"ignoring host bridge window %pR (conflicts with %s %pR)\n",
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res, conflict->name, conflict);
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else
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pci_add_resource_offset(resources, res,
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info->res_offset[i]);
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}
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}
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static void free_pci_root_info_res(struct pci_root_info *info)
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{
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kfree(info->res);
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info->res = NULL;
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kfree(info->res_offset);
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info->res_offset = NULL;
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info->res_num = 0;
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}
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static void __release_pci_root_info(struct pci_root_info *info)
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{
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int i;
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struct resource *res;
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for (i = 0; i < info->res_num; i++) {
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res = &info->res[i];
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if (!res->parent)
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continue;
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if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
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continue;
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release_resource(res);
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resource_list_destroy_entry(entry);
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}
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}
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free_pci_root_info_res(info);
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teardown_mcfg_map(info);
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kfree(info);
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list_splice_tail(crs_res, resources);
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}
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static void release_pci_root_info(struct pci_host_bridge *bridge)
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{
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struct resource *res;
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struct resource_entry *entry;
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struct pci_root_info *info = bridge->release_data;
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__release_pci_root_info(info);
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resource_list_for_each_entry(entry, &bridge->windows) {
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res = entry->res;
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if (res->parent &&
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(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
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release_resource(res);
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}
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teardown_mcfg_map(info);
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kfree(info);
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}
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static void probe_pci_root_info(struct pci_root_info *info,
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struct acpi_device *device,
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int busnum, int domain)
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int busnum, int domain,
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struct list_head *list)
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{
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size_t size;
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int ret;
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struct resource_entry *entry;
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sprintf(info->name, "PCI Bus %04x:%02x", domain, busnum);
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info->bridge = device;
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info->res_num = 0;
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
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info);
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if (!info->res_num)
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return;
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size = sizeof(*info->res) * info->res_num;
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info->res = kzalloc_node(size, GFP_KERNEL, info->sd.node);
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if (!info->res) {
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info->res_num = 0;
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return;
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}
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size = sizeof(*info->res_offset) * info->res_num;
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info->res_num = 0;
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info->res_offset = kzalloc_node(size, GFP_KERNEL, info->sd.node);
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if (!info->res_offset) {
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kfree(info->res);
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info->res = NULL;
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return;
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}
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acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
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info);
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ret = acpi_dev_get_resources(device, list,
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acpi_dev_filter_resource_type_cb,
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(void *)(IORESOURCE_IO | IORESOURCE_MEM));
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if (ret < 0)
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dev_warn(&device->dev,
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"failed to parse _CRS method, error code %d\n", ret);
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else if (ret == 0)
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dev_dbg(&device->dev,
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"no IO and memory resources present in _CRS\n");
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else
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resource_list_for_each_entry(entry, list)
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entry->res->name = info->name;
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}
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struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
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@ -475,6 +355,8 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
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struct pci_root_info *info;
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int domain = root->segment;
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int busnum = root->secondary.start;
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struct resource_entry *res_entry;
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LIST_HEAD(crs_res);
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LIST_HEAD(resources);
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struct pci_bus *bus;
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struct pci_sysdata *sd;
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@ -522,18 +404,22 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
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memcpy(bus->sysdata, sd, sizeof(*sd));
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kfree(info);
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} else {
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probe_pci_root_info(info, device, busnum, domain);
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/* insert busn res at first */
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pci_add_resource(&resources, &root->secondary);
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/*
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* _CRS with no apertures is normal, so only fall back to
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* defaults or native bridge info if we're ignoring _CRS.
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*/
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if (pci_use_crs)
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add_resources(info, &resources);
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else {
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free_pci_root_info_res(info);
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probe_pci_root_info(info, device, busnum, domain, &crs_res);
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if (pci_use_crs) {
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add_resources(info, &resources, &crs_res);
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} else {
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resource_list_for_each_entry(res_entry, &crs_res)
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dev_printk(KERN_DEBUG, &device->dev,
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"host bridge window %pR (ignored)\n",
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res_entry->res);
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resource_list_free(&crs_res);
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x86_pci_root_bus_resources(busnum, &resources);
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}
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@ -548,8 +434,9 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
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to_pci_host_bridge(bus->bridge),
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release_pci_root_info, info);
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} else {
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pci_free_resource_list(&resources);
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__release_pci_root_info(info);
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resource_list_free(&resources);
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teardown_mcfg_map(info);
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kfree(info);
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}
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}
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