@@ -329,6 +329,7 @@ config ACPI_NUMA
config ACPI_HMAT
bool "ACPI Heterogeneous Memory Attribute Table Support"
depends on ACPI_NUMA
+ select HMEM_REPORTING
help
Parses representation of the ACPI Heterogeneous Memory Attributes
Table (HMAT) and set the memory node relationships and access
@@ -23,6 +23,8 @@ struct memory_target {
struct list_head node;
unsigned int memory_pxm;
unsigned long p_nodes[BITS_TO_LONGS(MAX_NUMNODES)];
+ bool hmem_valid;
+ struct node_hmem_attrs hmem;
};
static __init struct memory_target *find_mem_target(unsigned int m)
@@ -108,6 +110,34 @@ static __init void hmat_update_access(u8 type, u32 value, u32 *best)
}
}
+static __init void hmat_update_target(struct memory_target *t, u8 type,
+ u32 value)
+{
+ switch (type) {
+ case ACPI_HMAT_ACCESS_LATENCY:
+ t->hmem.read_latency = value;
+ t->hmem.write_latency = value;
+ break;
+ case ACPI_HMAT_READ_LATENCY:
+ t->hmem.read_latency = value;
+ break;
+ case ACPI_HMAT_WRITE_LATENCY:
+ t->hmem.write_latency = value;
+ break;
+ case ACPI_HMAT_ACCESS_BANDWIDTH:
+ t->hmem.read_bandwidth = value;
+ t->hmem.write_bandwidth = value;
+ break;
+ case ACPI_HMAT_READ_BANDWIDTH:
+ t->hmem.read_bandwidth = value;
+ break;
+ case ACPI_HMAT_WRITE_BANDWIDTH:
+ t->hmem.write_bandwidth = value;
+ break;
+ }
+ t->hmem_valid = true;
+}
+
static __init int hmat_parse_locality(union acpi_subtable_headers *header,
const unsigned long end)
{
@@ -166,6 +196,8 @@ static __init int hmat_parse_locality(union acpi_subtable_headers *header,
set_bit(p_node, t->p_nodes);
}
}
+ if (t && best)
+ hmat_update_target(t, type, best);
}
return 0;
}
@@ -267,6 +299,8 @@ static __init void hmat_register_targets(void)
m = pxm_to_node(t->memory_pxm);
for_each_set_bit(p, t->p_nodes, MAX_NUMNODES)
register_memory_node_under_compute_node(m, p, 0);
+ if (t->hmem_valid)
+ node_set_perf_attrs(m, &t->hmem, 0);
kfree(t);
}
}
Save the best performace access attributes and register these with the memory's node if HMAT provides the locality table. While HMAT does make it possible to know performance for all possible initiator-target pairings, we export only the best pairings at this time. Signed-off-by: Keith Busch <keith.busch@intel.com> --- drivers/acpi/Kconfig | 1 + drivers/acpi/hmat.c | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+)