It is useful to have markers in the OA reports to identify triggered
reports. Whitelist some OA counters that can be used as markers.
A triggered report can be found faster if we can sample the HW tail and
head registers when the report was triggered. Whitelist OA buffer
specific registers.
v2:
- Bump up the perf revision (Lionel)
- Use indexing for counters (Lionel)
- Fix selftest for oa ticking register (Umesh)
v3: Pardon whitelisted registers for selftest (Umesh)
v4:
- Document whitelisted registers (Lionel)
- Fix live isolated whitelist for OA regs (Umesh)
v5:
- Free up whitelist slots. Remove GPU_TICKS and A20 counter (Piotr)
- Whitelist registers only if perf_stream_paranoid is set to 0 (Jon)
v6: Move oa whitelist array to i915_perf (Chris)
Signed-off-by: Piotr Maciejewski <piotr.maciejewski@xxxxxxxxx>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_perf.c | 18 +++++++++++++++++-
drivers/gpu/drm/i915/i915_reg.h | 16 ++++++++++++++--
2 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 30f5025b2ff6..de3d1738aabe 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1367,11 +1367,19 @@ free_noa_wait(struct i915_perf_stream *stream)
static const i915_reg_t gen9_oa_wl_regs[] = {
{ __OAREPORTTRIG2 | RING_FORCE_TO_NONPRIV_ACCESS_RW },
{ __OAREPORTTRIG6 | RING_FORCE_TO_NONPRIV_ACCESS_RW },
+ { __OA_PERF_COUNTER_A(18) | (RING_FORCE_TO_NONPRIV_ACCESS_RW |
+ RING_FORCE_TO_NONPRIV_RANGE_4) },
+ { __GEN8_OASTATUS | (RING_FORCE_TO_NONPRIV_ACCESS_RD |
+ RING_FORCE_TO_NONPRIV_RANGE_4) },
};
static const i915_reg_t gen12_oa_wl_regs[] = {
{ __GEN12_OAG_OAREPORTTRIG2 | RING_FORCE_TO_NONPRIV_ACCESS_RW },
{ __GEN12_OAG_OAREPORTTRIG6 | RING_FORCE_TO_NONPRIV_ACCESS_RW },
+ { __GEN12_OAG_PERF_COUNTER_A(18) | (RING_FORCE_TO_NONPRIV_ACCESS_RW |
+ RING_FORCE_TO_NONPRIV_RANGE_4) },
+ { __GEN12_OAG_OASTATUS | (RING_FORCE_TO_NONPRIV_ACCESS_RD |
+ RING_FORCE_TO_NONPRIV_RANGE_4) },
};
static int intel_engine_apply_oa_whitelist(struct i915_perf_stream *stream)
@@ -4623,8 +4631,16 @@ int i915_perf_ioctl_version(void)
* into the OA buffer. This applies only to gen8+. The feature can
* only be accessed if perf_stream_paranoid is set to 0 by privileged
* user.
+ *
+ * 7: Whitelist below OA registers for user to identify the location of
+ * triggered reports in the OA buffer. This applies only to gen8+.
+ * The feature can only be accessed if perf_stream_paranoid is set to
+ * 0 by privileged user.
+ *
+ * - OA buffer head/tail/status/buffer registers for read only
+ * - OA counters A18, A19, A20 for read/write
*/
- return 6;
+ return 7;
}
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 114958854d67..09940d7d00cf 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -695,7 +695,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define GEN7_OASTATUS2_HEAD_MASK 0xffffffc0
#define GEN7_OASTATUS2_MEM_SELECT_GGTT (1 << 0) /* 0: PPGTT, 1: GGTT */
-#define GEN8_OASTATUS _MMIO(0x2b08)
+#define __GEN8_OASTATUS 0x2b08
+#define GEN8_OASTATUS _MMIO(__GEN8_OASTATUS)
#define GEN8_OASTATUS_TAIL_POINTER_WRAP (1 << 17)
#define GEN8_OASTATUS_HEAD_POINTER_WRAP (1 << 16)
#define GEN8_OASTATUS_OVERRUN_STATUS (1 << 3)
@@ -755,7 +756,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define GEN12_OAG_OA_DEBUG_DISABLE_GO_1_0_REPORTS (1 << 2)
#define GEN12_OAG_OA_DEBUG_DISABLE_CTX_SWITCH_REPORTS (1 << 1)
-#define GEN12_OAG_OASTATUS _MMIO(0xdafc)
+#define __GEN12_OAG_OASTATUS 0xdafc
+#define GEN12_OAG_OASTATUS _MMIO(__GEN12_OAG_OASTATUS)
#define GEN12_OAG_OASTATUS_COUNTER_OVERFLOW (1 << 2)
#define GEN12_OAG_OASTATUS_BUFFER_OVERFLOW (1 << 1)
#define GEN12_OAG_OASTATUS_REPORT_LOST (1 << 0)
@@ -998,6 +1000,16 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
#define OAREPORTTRIG8_NOA_SELECT_6_SHIFT 24
#define OAREPORTTRIG8_NOA_SELECT_7_SHIFT 28
+/* Performance counters registers */
+#define __OA_PERF_COUNTER_A(idx) (0x2800 + 8 * (idx))
+#define OA_PERF_COUNTER_A(idx) _MMIO(__OA_PERF_COUNTER_A(idx))
+#define OA_PERF_COUNTER_A_UDW(idx) _MMIO(__OA_PERF_COUNTER_A(idx) + 4)
+
+/* Gen12 Performance counters registers */
+#define __GEN12_OAG_PERF_COUNTER_A(idx) (0xD980 + 8 * (idx))
+#define GEN12_OAG_PERF_COUNTER_A(idx) _MMIO(__GEN12_OAG_PERF_COUNTER_A(idx))
+#define GEN12_OAG_PERF_COUNTER_A_UDW(idx) _MMIO(__GEN12_OAG_PERF_COUNTER_A(idx) + 4)
+
/* Same layout as OASTARTTRIGX */
#define GEN12_OAG_OASTARTTRIG1 _MMIO(0xd900)
#define GEN12_OAG_OASTARTTRIG2 _MMIO(0xd904)
--
2.20.1
