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Subject[PATCH 11/32] x86/intel_rdt: Class of service and capacity bitmask management for CDP
Date
From: Vikas Shivappa <vikas.shivappa@linux.intel.com>

Add support to manage CLOSid(CLass Of Service id) and capacity
bitmask(cbm) for code data prioritization(CDP).

Closid management includes changes to allocating, freeing closid and
closid_get and closid_put and changes to closid availability map during
CDP set up. CDP has a separate cbm for code and data.

Each closid is mapped to a (dcache_cbm, icache_cbm) pair when cdp mode
is enabled.

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/kernel/cpu/intel_rdt.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index 14b9011..7a03671 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -30,7 +30,13 @@
#include <asm/intel_rdt.h>

/*
- * cctable maintains 1:1 mapping between CLOSid and cache bitmask.
+ * During cache alloc mode cctable maintains 1:1 mapping between
+ * CLOSid and l3_cbm.
+ *
+ * During CDP mode, the cctable maintains a 1:2 mapping between the closid
+ * and (dcache_cbm, icache_cbm) pair.
+ * index of a dcache_cbm for CLOSid 'n' = n << 1.
+ * index of a icache_cbm for CLOSid 'n' = n << 1 + 1
*/
static struct clos_cbm_table *cctable;
/*
@@ -53,6 +59,13 @@ static bool cdp_enabled;

#define __DCBM_TABLE_INDEX(x) (x << 1)
#define __ICBM_TABLE_INDEX(x) ((x << 1) + 1)
+#define __DCBM_MSR_INDEX(x) \
+ CBM_FROM_INDEX(__DCBM_TABLE_INDEX(x))
+#define __ICBM_MSR_INDEX(x) \
+ CBM_FROM_INDEX(__ICBM_TABLE_INDEX(x))
+
+#define DCBM_TABLE_INDEX(x) (x << cdp_enabled)
+#define ICBM_TABLE_INDEX(x) ((x << cdp_enabled) + cdp_enabled)

struct rdt_remote_data {
int msr;
@@ -132,9 +145,12 @@ static inline void closid_tasks_sync(void)
on_each_cpu_mask(cpu_online_mask, __intel_rdt_sched_in, NULL, 1);
}

+/*
+ * When cdp mode is enabled, refcnt is maintained in the dcache_cbm entry.
+ */
static inline void closid_get(u32 closid)
{
- struct clos_cbm_table *cct = &cctable[closid];
+ struct clos_cbm_table *cct = &cctable[DCBM_TABLE_INDEX(closid)];

lockdep_assert_held(&rdt_group_mutex);

@@ -164,7 +180,7 @@ static int closid_alloc(u32 *closid)
static inline void closid_free(u32 closid)
{
clear_bit(closid, cconfig.closmap);
- cctable[closid].l3_cbm = 0;
+ cctable[DCBM_TABLE_INDEX(closid)].l3_cbm = 0;

if (WARN_ON(!cconfig.closids_used))
return;
@@ -174,7 +190,7 @@ static inline void closid_free(u32 closid)

static void closid_put(u32 closid)
{
- struct clos_cbm_table *cct = &cctable[closid];
+ struct clos_cbm_table *cct = &cctable[DCBM_TABLE_INDEX(closid)];

lockdep_assert_held(&rdt_group_mutex);
if (WARN_ON(!cct->clos_refcnt))
--
2.5.0
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