diff options
| -rw-r--r-- | src/device/Kconfig | 2 | ||||
| -rw-r--r-- | src/device/resource_allocator_v4.c | 194 |
2 files changed, 30 insertions, 166 deletions
diff --git a/src/device/Kconfig b/src/device/Kconfig index af9beb32f5..8d10c17f4e 100644 --- a/src/device/Kconfig +++ b/src/device/Kconfig @@ -934,7 +934,7 @@ config RESOURCE_ALLOCATOR_V4 above 4G boundary as well. config RESOURCE_ALLOCATION_TOP_DOWN - bool "Allocate resources from top down" + bool "Allocate resources from top down" if !PCIEXP_HOTPLUG_PREFETCH_MEM_ABOVE_4G default y depends on RESOURCE_ALLOCATOR_V4 diff --git a/src/device/resource_allocator_v4.c b/src/device/resource_allocator_v4.c index 222f1e9a47..03cec3e673 100644 --- a/src/device/resource_allocator_v4.c +++ b/src/device/resource_allocator_v4.c @@ -1,5 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ +#include <stdint.h> +#include <commonlib/helpers.h> #include <console/console.h> #include <device/device.h> #include <memrange.h> @@ -22,6 +24,17 @@ static bool dev_has_children(const struct device *dev) return bus && bus->children; } +static resource_t effective_limit(const struct resource *const res) +{ + /* Always allow bridge resources above 4G. */ + if (res->flags & IORESOURCE_BRIDGE) + return res->limit; + + const resource_t quirk_4g_limit = + res->flags & IORESOURCE_ABOVE_4G ? UINT64_MAX : UINT32_MAX; + return MIN(res->limit, quirk_4g_limit); +} + #define res_printk(depth, str, ...) printk(BIOS_DEBUG, "%*c"str, depth, ' ', __VA_ARGS__) /* @@ -95,22 +108,8 @@ static void update_bridge_resource(const struct device *bridge, struct resource * starts at the domain level takes into account all these constraints * thus working on a global view. */ - if (child_res->limit < bridge_res->limit) - bridge_res->limit = child_res->limit; - - /* - * Propagate the downstream resource request to allocate above 4G - * boundary to upstream bridge resource. This ensures that during - * pass 2, the resource allocator at domain level has a global view - * of all the downstream device requirements and thus address space - * is allocated as per updated flags in the bridge resource. - * - * Since the bridge resource is a single window, all the downstream - * resources of this bridge resource will be allocated in space above - * the 4G boundary. - */ - if (child_res->flags & IORESOURCE_ABOVE_4G) - bridge_res->flags |= IORESOURCE_ABOVE_4G; + if (effective_limit(child_res) < bridge_res->limit) + bridge_res->limit = effective_limit(child_res); /* * Alignment value of 0 means that the child resource has no alignment @@ -223,129 +222,6 @@ static unsigned char get_alignment_by_resource_type(const struct resource *res) die("Unexpected resource type: flags(%d)!\n", res->flags); } -/* - * If the resource is NULL or if the resource is not assigned, then it - * cannot be used for allocation for downstream devices. - */ -static bool is_resource_invalid(const struct resource *res) -{ - return (res == NULL) || !(res->flags & IORESOURCE_ASSIGNED); -} - -static void initialize_domain_io_resource_memranges(struct memranges *ranges, - const struct resource *res, - unsigned long memrange_type) -{ - memranges_insert(ranges, res->base, res->limit - res->base + 1, memrange_type); -} - -static void initialize_domain_mem_resource_memranges(struct memranges *ranges, - const struct resource *res, - unsigned long memrange_type) -{ - resource_t res_base; - resource_t res_limit; - - const resource_t limit_4g = 0xffffffff; - - res_base = res->base; - res_limit = res->limit; - - /* - * Split the resource into two separate ranges if it crosses the 4G - * boundary. Memrange type is set differently to ensure that memrange - * does not merge these two ranges. For the range above 4G boundary, - * given memrange type is ORed with IORESOURCE_ABOVE_4G. - */ - if (res_base <= limit_4g) { - - resource_t range_limit; - - /* Clip the resource limit at 4G boundary if necessary. */ - range_limit = MIN(res_limit, limit_4g); - memranges_insert(ranges, res_base, range_limit - res_base + 1, memrange_type); - - /* - * If the resource lies completely below the 4G boundary, nothing more - * needs to be done. - */ - if (res_limit <= limit_4g) - return; - - /* - * If the resource window crosses the 4G boundary, then update res_base - * to add another entry for the range above the boundary. - */ - res_base = limit_4g + 1; - } - - if (res_base > res_limit) - return; - - /* - * If resource lies completely above the 4G boundary or if the resource - * was clipped to add two separate ranges, the range above 4G boundary - * has the resource flag IORESOURCE_ABOVE_4G set. This allows domain to - * handle any downstream requests for resource allocation above 4G - * differently. - */ - memranges_insert(ranges, res_base, res_limit - res_base + 1, - memrange_type | IORESOURCE_ABOVE_4G); -} - -/* - * This function initializes memranges for domain device. If the - * resource crosses 4G boundary, then this function splits it into two - * ranges -- one for the window below 4G and the other for the window - * above 4G. The latter range has IORESOURCE_ABOVE_4G flag set to - * satisfy resource requests from downstream devices for allocations - * above 4G. - */ -static void initialize_domain_memranges(struct memranges *ranges, const struct resource *res, - unsigned long memrange_type) -{ - unsigned char align = get_alignment_by_resource_type(res); - - memranges_init_empty_with_alignment(ranges, NULL, 0, align); - - if (is_resource_invalid(res)) - return; - - if (res->flags & IORESOURCE_IO) - initialize_domain_io_resource_memranges(ranges, res, memrange_type); - else - initialize_domain_mem_resource_memranges(ranges, res, memrange_type); -} - -/* - * This function initializes memranges for bridge device. Unlike domain, - * bridge does not need to care about resource window crossing 4G - * boundary. This is handled by the resource allocator at domain level - * to ensure that all downstream bridges are allocated space either - * above or below 4G boundary as per the state of IORESOURCE_ABOVE_4G - * for the respective bridge resource. - * - * So, this function creates a single range of the entire resource - * window available for the bridge resource. Thus all downstream - * resources of the bridge for the given resource type get allocated - * space from the same window. If there is any downstream resource of - * the bridge which requests allocation above 4G, then all other - * downstream resources of the same type under the bridge get allocated - * above 4G. - */ -static void initialize_bridge_memranges(struct memranges *ranges, const struct resource *res, - unsigned long memrange_type) -{ - unsigned char align = get_alignment_by_resource_type(res); - - memranges_init_empty_with_alignment(ranges, NULL, 0, align); - - if (is_resource_invalid(res)) - return; - - memranges_insert(ranges, res->base, res->limit - res->base + 1, memrange_type); -} - static void print_resource_ranges(const struct device *dev, const struct memranges *ranges) { const struct range_entry *r; @@ -383,12 +259,13 @@ static void allocate_child_resources(struct bus *bus, struct memranges *ranges, if (!resource->size) continue; - if (memranges_steal(ranges, resource->limit, resource->size, resource->align, - type_match, &resource->base, allocate_top_down) == false) { + if (memranges_steal(ranges, effective_limit(resource), resource->size, + resource->align, type_match, &resource->base, + allocate_top_down) == false) { printk(BIOS_ERR, " ERROR: Resource didn't fit!!! "); printk(BIOS_DEBUG, " %s %02lx * size: 0x%llx limit: %llx %s\n", - dev_path(dev), resource->index, - resource->size, resource->limit, resource2str(resource)); + dev_path(dev), resource->index, resource->size, + effective_limit(resource), resource2str(resource)); continue; } @@ -471,8 +348,8 @@ static void constrain_domain_resources(const struct device *domain, struct memra /* * This function creates a list of memranges of given type using the - * resource that is provided. If the given resource is NULL or if the - * resource window size is 0, then it creates an empty list. This + * resource that is provided. If the given resource is unassigned or if + * the resource window size is 0, then it creates an empty list. This * results in resource allocation for that resource type failing for * all downstream devices since there is nothing to allocate from. * @@ -486,16 +363,17 @@ static void constrain_domain_resources(const struct device *domain, struct memra static void setup_resource_ranges(const struct device *dev, const struct resource *res, unsigned long type, struct memranges *ranges) { + const unsigned char alignment = get_alignment_by_resource_type(res); + printk(BIOS_DEBUG, "%s %s: base: %llx size: %llx align: %d gran: %d limit: %llx\n", dev_path(dev), resource2str(res), res->base, res->size, res->align, res->gran, res->limit); - if (dev->path.type == DEVICE_PATH_DOMAIN) { - initialize_domain_memranges(ranges, res, type); + memranges_init_empty_with_alignment(ranges, NULL, 0, alignment); + if (res->flags & IORESOURCE_ASSIGNED) + memranges_insert(ranges, res->base, res->limit - res->base + 1, type); + if (dev->path.type == DEVICE_PATH_DOMAIN) constrain_domain_resources(dev, ranges, type); - } else { - initialize_bridge_memranges(ranges, res, type); - } print_resource_ranges(dev, ranges); } @@ -608,26 +486,12 @@ static void allocate_domain_resources(const struct device *domain) * the resource allocation at domain level considers mem and prefmem * together when finding the best fit based on the biggest resource * requirement. - * - * However, resource requests for allocation above 4G boundary need to - * be handled separately if the domain resource window crosses this - * boundary. There is a single window for resource of type - * IORESOURCE_MEM. When creating memranges, this resource is split into - * two separate ranges -- one for the window below 4G boundary and other - * for the window above 4G boundary (with IORESOURCE_ABOVE_4G flag set). - * Thus, when allocating child resources, requests for below and above - * the 4G boundary are handled separately by setting the type_mask and - * type_match to allocate_child_resources() accordingly. */ res = find_domain_resource(domain, IORESOURCE_MEM); if (res) { setup_resource_ranges(domain, res, IORESOURCE_MEM, &ranges); allocate_child_resources(domain->link_list, &ranges, - IORESOURCE_TYPE_MASK | IORESOURCE_ABOVE_4G, - IORESOURCE_MEM); - allocate_child_resources(domain->link_list, &ranges, - IORESOURCE_TYPE_MASK | IORESOURCE_ABOVE_4G, - IORESOURCE_MEM | IORESOURCE_ABOVE_4G); + IORESOURCE_TYPE_MASK, IORESOURCE_MEM); cleanup_resource_ranges(domain, &ranges, res); } |