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-rw-r--r--Documentation/x86/intel_rdt_ui.txt7
-rw-r--r--arch/x86/kernel/cpu/intel_rdt.c2
-rw-r--r--arch/x86/kernel/cpu/intel_rdt.h3
-rw-r--r--arch/x86/kernel/cpu/intel_rdt_rdtgroup.c16
4 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt
index 76f21e2ac176..4d8848e4e224 100644
--- a/Documentation/x86/intel_rdt_ui.txt
+++ b/Documentation/x86/intel_rdt_ui.txt
@@ -48,6 +48,13 @@ related to allocation:
"min_cbm_bits": The minimum number of consecutive bits which
must be set when writing a mask.
+"shareable_bits": Bitmask of shareable resource with other executing
+ entities (e.g. I/O). User can use this when
+ setting up exclusive cache partitions. Note that
+ some platforms support devices that have their
+ own settings for cache use which can over-ride
+ these bits.
+
Memory bandwitdh(MB) subdirectory contains the following files
with respect to allocation:
diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index de26aa7971d4..da4f3898d517 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -193,6 +193,7 @@ static inline bool cache_alloc_hsw_probe(void)
r->num_closid = 4;
r->default_ctrl = max_cbm;
r->cache.cbm_len = 20;
+ r->cache.shareable_bits = 0xc0000;
r->cache.min_cbm_bits = 2;
r->alloc_capable = true;
r->alloc_enabled = true;
@@ -260,6 +261,7 @@ static void rdt_get_cache_alloc_cfg(int idx, struct rdt_resource *r)
r->num_closid = edx.split.cos_max + 1;
r->cache.cbm_len = eax.split.cbm_len + 1;
r->default_ctrl = BIT_MASK(eax.split.cbm_len + 1) - 1;
+ r->cache.shareable_bits = ebx & r->default_ctrl;
r->data_width = (r->cache.cbm_len + 3) / 4;
r->alloc_capable = true;
r->alloc_enabled = true;
diff --git a/arch/x86/kernel/cpu/intel_rdt.h b/arch/x86/kernel/cpu/intel_rdt.h
index 94e488af082e..4040bf1a075c 100644
--- a/arch/x86/kernel/cpu/intel_rdt.h
+++ b/arch/x86/kernel/cpu/intel_rdt.h
@@ -227,12 +227,15 @@ struct msr_param {
* @cbm_idx_offset: Offset of CBM index. CBM index is computed by:
* closid * cbm_idx_multi + cbm_idx_offset
* in a cache bit mask
+ * @shareable_bits: Bitmask of shareable resource with other
+ * executing entities
*/
struct rdt_cache {
unsigned int cbm_len;
unsigned int min_cbm_bits;
unsigned int cbm_idx_mult;
unsigned int cbm_idx_offset;
+ unsigned int shareable_bits;
};
/**
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index c24dd067b9c5..2621ae3f07fc 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -596,6 +596,15 @@ static int rdt_min_cbm_bits_show(struct kernfs_open_file *of,
return 0;
}
+static int rdt_shareable_bits_show(struct kernfs_open_file *of,
+ struct seq_file *seq, void *v)
+{
+ struct rdt_resource *r = of->kn->parent->priv;
+
+ seq_printf(seq, "%x\n", r->cache.shareable_bits);
+ return 0;
+}
+
static int rdt_min_bw_show(struct kernfs_open_file *of,
struct seq_file *seq, void *v)
{
@@ -712,6 +721,13 @@ static struct rftype res_common_files[] = {
.fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE,
},
{
+ .name = "shareable_bits",
+ .mode = 0444,
+ .kf_ops = &rdtgroup_kf_single_ops,
+ .seq_show = rdt_shareable_bits_show,
+ .fflags = RF_CTRL_INFO | RFTYPE_RES_CACHE,
+ },
+ {
.name = "min_bandwidth",
.mode = 0444,
.kf_ops = &rdtgroup_kf_single_ops,