Data from I/O devices can be inserted directly into L3 cache. This reduces
demands on DRAM bandwidth and reduces latency to the processor consuming
the I/O data.
Introduce cache resource property "io_alloc_capable" that an architecture
can set if a portion of the L3 cache can be allocated for I/O traffic.
Set this property on x86 systems that support SDCIAE (L3 Smart Data Cache
Injection Allocation Enforcement).
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v4: Updated the commit message and code comment based on feedback.
v3: Rewrote commit log. Changed the text to bit generic than the AMD specific.
Renamed the rdt_get_sdciae_alloc_cfg() to rdt_set_io_alloc_capable().
Removed leftover comment from v2.
v2: Changed sdciae_capable to io_alloc_capable to make it generic feature.
Also moved the io_alloc_capable in struct resctrl_cache.
---
arch/x86/kernel/cpu/resctrl/core.c | 7 +++++++
include/linux/resctrl.h | 3 +++
2 files changed, 10 insertions(+)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 422083dc4651..c478f591b7c1 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -292,6 +292,11 @@ static void rdt_get_cdp_config(int level)
rdt_resources_all[level].r_resctrl.cdp_capable = true;
}
+static void rdt_set_io_alloc_capable(struct rdt_resource *r)
+{
+ r->cache.io_alloc_capable = true;
+}
+
static void rdt_get_cdp_l3_config(void)
{
rdt_get_cdp_config(RDT_RESOURCE_L3);
@@ -858,6 +863,8 @@ static __init bool get_rdt_alloc_resources(void)
rdt_get_cache_alloc_cfg(1, r);
if (rdt_cpu_has(X86_FEATURE_CDP_L3))
rdt_get_cdp_l3_config();
+ if (rdt_cpu_has(X86_FEATURE_SDCIAE))
+ rdt_set_io_alloc_capable(r);
ret = true;
}
if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 880351ca3dfc..dd09bb9a173b 100644
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -177,6 +177,8 @@ struct rdt_mon_domain {
* @arch_has_sparse_bitmasks: True if a bitmask like f00f is valid.
* @arch_has_per_cpu_cfg: True if QOS_CFG register for this cache
* level has CPU scope.
+ * @io_alloc_capable: True if portion of the cache can be allocated
+ * for I/O traffic.
*/
struct resctrl_cache {
unsigned int cbm_len;
@@ -184,6 +186,7 @@ struct resctrl_cache {
unsigned int shareable_bits;
bool arch_has_sparse_bitmasks;
bool arch_has_per_cpu_cfg;
+ bool io_alloc_capable;
};
/**
--
2.34.1
