Re: [Patch v2 19/22] x86/PCI/ACPI: Use common ACPI resource interfaces to simplify implementation

Bjorn Helgaas
2015-01-29T01:20:01Z

On Wed, Jan 28, 2015 at 06:57:37PM +0800, Jiang Liu wrote:
> Use common ACPI resource discovery interfaces to simplify PCI host bridge
> resource enumeration.
>
> It also fixes the issue discovered by Thomas that function setup_resource()
> incorrectly validates IO port resources against iomem_resource.

Is it possible to split this bug fix into its own separate patch? Mixing
things together makes git archaeology harder because it hides tiny bug
fixes inside big changes.

> Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
> ---
> arch/x86/pci/acpi.c | 296 ++++++++++++++++-----------------------------------
> 1 file changed, 94 insertions(+), 202 deletions(-)
>
> diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
> index bb98afd0591e..3404ea703ecc 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;
> @@ -218,130 +215,44 @@ 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;
> -
> - 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;
> - } else if (addr.resource_type == ACPI_IO_RANGE) {
> - flags = IORESOURCE_IO;
> - } 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, (u64)iomem_resource.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_list_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 [%#llx-%#llx] (ignored, not CPU addressable)\n",
> + (unsigned long long)res1->start,
> + (unsigned long long)res1->end);
> + free = true;
> + goto next;
> + } else if (res1->end != end) {
> + dev_info(dev, "host bridge window [%#llx-%#llx] ([%#llx-%#llx] ignored, not CPU addressable)\n",
> + (unsigned long long)res1->start,
> + (unsigned long long)res1->end,
> + (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;
>
> @@ -353,118 +264,92 @@ 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_list_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_list_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_list_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)
> @@ -473,6 +358,8 @@ 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_list_entry *res_entry;
> + LIST_HEAD(crs_res);
> LIST_HEAD(resources);
> struct pci_bus *bus;
> struct pci_sysdata *sd;
> @@ -520,18 +407,22 @@ 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);
> }
>
> @@ -546,8 +437,9 @@ 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);
> }
> }
>
> --
> 1.7.10.4
>