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Subject[PATCHv2 08/12] acpi/hmat: Register performance attributes
Date
Save the best performance access attributes and register these with the
memory's node if HMAT provides the locality table.

Signed-off-by: Keith Busch <keith.busch@intel.com>
---
drivers/acpi/Kconfig | 1 +
drivers/acpi/hmat.c | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 35 insertions(+)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 9a05af3a18cf..6b5f6ca690af 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -330,6 +330,7 @@ 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
diff --git a/drivers/acpi/hmat.c b/drivers/acpi/hmat.c
index 5d8747ad025f..40bc83f4b593 100644
--- a/drivers/acpi/hmat.c
+++ b/drivers/acpi/hmat.c
@@ -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);
+ if (t->hmem_valid)
+ node_set_perf_attrs(m, &t->hmem);
kfree(t);
}
}
--
2.14.4
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