From: Keith Busch <keith.bu...@intel.com>
Add memblock based enumeration of memory-side-cache of System RAM.
Detect the capability in early init through HMAT tables, and set the
size in the address range memblocks if a direct mapped side cache is
present.
Cc: <x...@kernel.org>
Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Mike Rapoport <r...@linux.ibm.com>
Signed-off-by: Keith Busch <keith.bu...@intel.com>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
---
arch/x86/Kconfig | 1 +
drivers/acpi/numa.c | 32 ++++++++++++++++++++++++++++++++
include/linux/memblock.h | 38 ++++++++++++++++++++++++++++++++++++++
mm/Kconfig | 3 +++
mm/memblock.c | 34 ++++++++++++++++++++++++++++++++++
5 files changed, 108 insertions(+)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8689e794a43c..3f9c413d8eb5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -171,6 +171,7 @@ config X86
select HAVE_KVM
select HAVE_LIVEPATCH if X86_64
select HAVE_MEMBLOCK_NODE_MAP
+ select HAVE_MEMBLOCK_CACHE_INFO if ACPI_NUMA
select HAVE_MIXED_BREAKPOINTS_REGS
select HAVE_MOD_ARCH_SPECIFIC
select HAVE_NMI
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c
index f5e09c39ff22..ec7e849f1c19 100644
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -40,6 +40,12 @@ static int pxm_to_node_map[MAX_PXM_DOMAINS]
static int node_to_pxm_map[MAX_NUMNODES]
= { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
+struct mem_cacheinfo {
+ phys_addr_t size;
+ bool direct_mapped;
+};
+static struct mem_cacheinfo side_cached_pxms[MAX_PXM_DOMAINS] __initdata;
+
unsigned char acpi_srat_revision __initdata;
int acpi_numa __initdata;
@@ -262,6 +268,8 @@ acpi_numa_memory_affinity_init(struct
acpi_srat_mem_affinity *ma)
u64 start, end;
u32 hotpluggable;
int node, pxm;
+ u64 cache_size;
+ bool direct;
if (srat_disabled())
goto out_err;
@@ -308,6 +316,13 @@ acpi_numa_memory_affinity_init(struct
acpi_srat_mem_affinity *ma)
pr_warn("SRAT: Failed to mark hotplug range [mem
%#010Lx-%#010Lx] in memblock\n",
(unsigned long long)start, (unsigned long long)end - 1);
+ cache_size = side_cached_pxms[pxm].size;
+ direct = side_cached_pxms[pxm].direct_mapped;
+ if (cache_size &&
+ memblock_set_sidecache(start, ma->length, cache_size, direct))
+ pr_warn("SRAT: Failed to mark side cached range [mem
%#010Lx-%#010Lx] in memblock\n",
+ (unsigned long long)start, (unsigned long long)end - 1);
+
max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));
return 0;
@@ -411,6 +426,18 @@ acpi_parse_memory_affinity(union acpi_subtable_headers *
header,
return 0;
}
+static int __init
+acpi_parse_cache(union acpi_subtable_headers *header, const unsigned long end)
+{
+ struct acpi_hmat_cache *c = (void *)header;
+ u32 attrs = (c->cache_attributes & ACPI_HMAT_CACHE_ASSOCIATIVITY) >> 8;
+
+ if (attrs == ACPI_HMAT_CA_DIRECT_MAPPED)
+ side_cached_pxms[c->memory_PD].direct_mapped = true;
+ side_cached_pxms[c->memory_PD].size += c->cache_size;
+ return 0;
+}
+
static int __init acpi_parse_srat(struct acpi_table_header *table)
{
struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
@@ -460,6 +487,11 @@ int __init acpi_numa_init(void)
sizeof(struct acpi_table_srat),
srat_proc, ARRAY_SIZE(srat_proc), 0);
+ acpi_table_parse_entries(ACPI_SIG_HMAT,
+ sizeof(struct acpi_table_hmat),
+ ACPI_HMAT_TYPE_CACHE,
+ acpi_parse_cache, 0);
+
cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
acpi_parse_memory_affinity, 0);
}
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index aee299a6aa76..29c3c88a5207 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -52,6 +52,8 @@ enum memblock_flags {
* @size: size of the region
* @flags: memory region attributes
* @nid: NUMA node id
+ * @cache_size: size of memory side cache in bytes
+ * @direct_mapped: true if direct mapped cache associativity exists
*/
struct memblock_region {
phys_addr_t base;
@@ -60,6 +62,10 @@ struct memblock_region {
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
int nid;
#endif
+#ifdef CONFIG_HAVE_MEMBLOCK_CACHE_INFO
+ phys_addr_t cache_size;
+ bool direct_mapped;
+#endif
};
/**
@@ -317,6 +323,38 @@ static inline int memblock_get_region_node(const struct
memblock_region *r)
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
+#ifdef CONFIG_HAVE_MEMBLOCK_CACHE_INFO
+int memblock_set_sidecache(phys_addr_t base, phys_addr_t size,
+ phys_addr_t cache_size, bool direct_mapped);
+
+static inline bool memblock_sidecache_direct_mapped(struct memblock_region *m)
+{
+ return m->direct_mapped;
+}
+
+static inline phys_addr_t memblock_sidecache_size(struct memblock_region *m)
+{
+ return m->cache_size;
+}
+#else
+static inline int memblock_set_sidecache(phys_addr_t base, phys_addr_t size,
+ phys_addr_t cache_size,
+ bool direct_mapped)
+{
+ return 0;
+}
+
+static inline phys_addr_t memblock_sidecache_size(struct memblock_region *m)
+{
+ return 0;
+}
+
+static inline bool memblock_sidecache_direct_mapped(struct memblock_region *m)
+{
+ return false;
+}
+#endif /* CONFIG_HAVE_MEMBLOCK_CACHE_INFO */
+
/* Flags for memblock allocation APIs */
#define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0)
#define MEMBLOCK_ALLOC_ACCESSIBLE 0
diff --git a/mm/Kconfig b/mm/Kconfig
index d85e39da47ae..c7944299a89e 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -142,6 +142,9 @@ config ARCH_DISCARD_MEMBLOCK
config MEMORY_ISOLATION
bool
+config HAVE_MEMBLOCK_CACHE_INFO
+ bool
+
#
# Only be set on architectures that have completely implemented memory hotplug
# feature. If you are not sure, don't touch it.
diff --git a/mm/memblock.c b/mm/memblock.c
index 9a2d5ae81ae1..8ebbc77f20c5 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -822,6 +822,40 @@ int __init_memblock memblock_reserve(phys_addr_t base,
phys_addr_t size)
return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES,
0);
}
+#ifdef CONFIG_HAVE_MEMBLOCK_CACHE_INFO
+/**
+ * memblock_set_sidecache - set the system memory cache info
+ * @base: base address of the region
+ * @size: size of the region
+ * @cache_size: system side cache size in bytes
+ * @direct: true if the cache has direct mapped associativity
+ *
+ * This function isolates region [@base, @base + @size), and saves the cache
+ * information.
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+int __init_memblock memblock_set_sidecache(phys_addr_t base, phys_addr_t size,
+ phys_addr_t cache_size, bool direct_mapped)
+{
+ struct memblock_type *type = &memblock.memory;
+ int i, ret, start_rgn, end_rgn;
+
+ ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
+ if (ret)
+ return ret;
+
+ for (i = start_rgn; i < end_rgn; i++) {
+ struct memblock_region *r = &type->regions[i];
+
+ r->cache_size = cache_size;
+ r->direct_mapped = direct_mapped;
+ }
+
+ return 0;
+}
+#endif
+
/**
* memblock_setclr_flag - set or clear flag for a memory region
* @base: base address of the region
