[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/79695/

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200721015717.46279-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (4):
  drm/i915/perf: Ensure observation logic is not clock gated
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   |  60 +++++
 .../gpu/drm/i915/gt/selftest_workarounds.c    |  25 +-
 drivers/gpu/drm/i915/i915_perf.c              | 221 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |  17 ++
 drivers/gpu/drm/i915/i915_reg.h               |  12 +
 include/uapi/drm/i915_drm.h                   |  32 +++
 8 files changed, 364 insertions(+), 7 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 1/4] drm/i915/perf: Ensure observation logic is not clock gated

[Umesh Nerlige Ramappa]

From: Piotr Maciejewski <piotr.maciejewski@intel.com>

A clock gating switch can control if the performance monitoring and
observation logic is enaled or not. Ensure that we enable the clocks.

v2: Separate code from other patches (Lionel)
v3: Reset PMON enable when disabling perf to save power (Lionel)

Fixes: 00a7f0d7155c ("drm/i915/tgl: Add perf support on TGL")
Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 drivers/gpu/drm/i915/i915_perf.c | 13 +++++++++++++
 drivers/gpu/drm/i915/i915_reg.h  |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index c6f6370283cf..fe408c327d3c 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -2493,6 +2493,14 @@ gen12_enable_metric_set(struct i915_perf_stream *stream,
 			    (period_exponent << GEN12_OAG_OAGLBCTXCTRL_TIMER_PERIOD_SHIFT))
 			    : 0);
 
+	/*
+	 * Initialize Super Queue Internal Cnt Register
+	 * Set PMON Enable in order to collect valid metrics.
+	 */
+	intel_uncore_write(uncore, GEN12_SQCNT1,
+			   intel_uncore_read(uncore, GEN12_SQCNT1) |
+			   GEN12_SQCNT1_PMON_ENABLE);
+
 	/*
 	 * Update all contexts prior writing the mux configurations as we need
 	 * to make sure all slices/subslices are ON before writing to NOA
@@ -2552,6 +2560,11 @@ static void gen12_disable_metric_set(struct i915_perf_stream *stream)
 
 	/* Make sure we disable noa to save power. */
 	intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0);
+
+	/* Reset PMON Enable to save power. */
+	intel_uncore_write(uncore, GEN12_SQCNT1,
+			   intel_uncore_read(uncore, GEN12_SQCNT1) &
+			   ~GEN12_SQCNT1_PMON_ENABLE);
 }
 
 static void gen7_oa_enable(struct i915_perf_stream *stream)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index b9607ac3620d..1638f1282541 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -696,6 +696,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
 #define OABUFFER_SIZE_16M   (7 << 3)
 
 #define GEN12_OA_TLB_INV_CR _MMIO(0xceec)
+#define GEN12_SQCNT1 _MMIO(0x8718)
+#define  GEN12_SQCNT1_PMON_ENABLE (1 << 30)
 
 /* Gen12 OAR unit */
 #define GEN12_OAR_OACONTROL _MMIO(0x2960)
-- 
2.20.1

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[Intel-gfx] [PATCH 2/4] drm/i915/perf: Whitelist OA report trigger registers

[Umesh Nerlige Ramappa]

From: Piotr Maciejewski <piotr.maciejewski@intel.com>

OA reports can be triggered into the OA buffer by writing into the
OAREPORTTRIG registers. Whitelist the registers to allow user to trigger
reports.

v2:
- Move related change to this patch (Lionel)
- Bump up perf revision (Lionel)

v3: Pardon whitelisted registers for selftest (Umesh)
v4: Document supported gens for the feature (Lionel)

Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 26 +++++++++++++++++++
 .../gpu/drm/i915/gt/selftest_workarounds.c    |  4 +++
 drivers/gpu/drm/i915/i915_perf.c              | 11 +++++---
 3 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 5726cd0a37e0..582a2c8cd219 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1365,6 +1365,20 @@ whitelist_reg(struct i915_wa_list *wal, i915_reg_t reg)
 	whitelist_reg_ext(wal, reg, RING_FORCE_TO_NONPRIV_ACCESS_RW);
 }
 
+static void gen9_whitelist_build_performance_counters(struct i915_wa_list *w)
+{
+	/* OA buffer trigger report 2/6 used by performance query */
+	whitelist_reg(w, OAREPORTTRIG2);
+	whitelist_reg(w, OAREPORTTRIG6);
+}
+
+static void gen12_whitelist_build_performance_counters(struct i915_wa_list *w)
+{
+	/* OA buffer trigger report 2/6 used by performance query */
+	whitelist_reg(w, GEN12_OAG_OAREPORTTRIG2);
+	whitelist_reg(w, GEN12_OAG_OAREPORTTRIG6);
+}
+
 static void gen9_whitelist_build(struct i915_wa_list *w)
 {
 	/* WaVFEStateAfterPipeControlwithMediaStateClear:skl,bxt,glk,cfl */
@@ -1378,6 +1392,9 @@ static void gen9_whitelist_build(struct i915_wa_list *w)
 
 	/* WaSendPushConstantsFromMMIO:skl,bxt */
 	whitelist_reg(w, COMMON_SLICE_CHICKEN2);
+
+	/* Performance counters support */
+	gen9_whitelist_build_performance_counters(w);
 }
 
 static void skl_whitelist_build(struct intel_engine_cs *engine)
@@ -1471,6 +1488,9 @@ static void cnl_whitelist_build(struct intel_engine_cs *engine)
 
 	/* WaEnablePreemptionGranularityControlByUMD:cnl */
 	whitelist_reg(w, GEN8_CS_CHICKEN1);
+
+	/* Performance counters support */
+	gen9_whitelist_build_performance_counters(w);
 }
 
 static void icl_whitelist_build(struct intel_engine_cs *engine)
@@ -1500,6 +1520,9 @@ static void icl_whitelist_build(struct intel_engine_cs *engine)
 		whitelist_reg_ext(w, PS_INVOCATION_COUNT,
 				  RING_FORCE_TO_NONPRIV_ACCESS_RD |
 				  RING_FORCE_TO_NONPRIV_RANGE_4);
+
+		/* Performance counters support */
+		gen9_whitelist_build_performance_counters(w);
 		break;
 
 	case VIDEO_DECODE_CLASS:
@@ -1550,6 +1573,9 @@ static void tgl_whitelist_build(struct intel_engine_cs *engine)
 
 		/* Wa_1806527549:tgl */
 		whitelist_reg(w, HIZ_CHICKEN);
+
+		/* Performance counters support */
+		gen12_whitelist_build_performance_counters(w);
 		break;
 	default:
 		whitelist_reg_ext(w,
diff --git a/drivers/gpu/drm/i915/gt/selftest_workarounds.c b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
index febc9e6692ba..c7d8af9ee34a 100644
--- a/drivers/gpu/drm/i915/gt/selftest_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
@@ -934,6 +934,10 @@ static bool pardon_reg(struct drm_i915_private *i915, i915_reg_t reg)
 	static const struct regmask pardon[] = {
 		{ GEN9_CTX_PREEMPT_REG, INTEL_GEN_MASK(9, 9) },
 		{ GEN8_L3SQCREG4, INTEL_GEN_MASK(9, 9) },
+		{ OAREPORTTRIG2, INTEL_GEN_MASK(8, 11) },
+		{ OAREPORTTRIG6, INTEL_GEN_MASK(8, 11) },
+		{ GEN12_OAG_OAREPORTTRIG2, INTEL_GEN_MASK(12, 12) },
+		{ GEN12_OAG_OAREPORTTRIG6, INTEL_GEN_MASK(12, 12) },
 	};
 
 	return find_reg(i915, reg, pardon, ARRAY_SIZE(pardon));
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index fe408c327d3c..30f6aeb819aa 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1448,7 +1448,8 @@ static void gen8_init_oa_buffer(struct i915_perf_stream *stream)
 	 *  bit."
 	 */
 	intel_uncore_write(uncore, GEN8_OABUFFER, gtt_offset |
-		   OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT);
+			   OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT |
+			   GEN7_OABUFFER_EDGE_TRIGGER);
 	intel_uncore_write(uncore, GEN8_OATAILPTR, gtt_offset & GEN8_OATAILPTR_MASK);
 
 	/* Mark that we need updated tail pointers to read from... */
@@ -1501,7 +1502,8 @@ static void gen12_init_oa_buffer(struct i915_perf_stream *stream)
 	 *  bit."
 	 */
 	intel_uncore_write(uncore, GEN12_OAG_OABUFFER, gtt_offset |
-			   OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT);
+			   OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT |
+			   GEN7_OABUFFER_EDGE_TRIGGER);
 	intel_uncore_write(uncore, GEN12_OAG_OATAILPTR,
 			   gtt_offset & GEN12_OAG_OATAILPTR_MASK);
 
@@ -4445,8 +4447,11 @@ int i915_perf_ioctl_version(void)
 	 *
 	 * 5: Add DRM_I915_PERF_PROP_POLL_OA_PERIOD parameter that controls the
 	 *    interval for the hrtimer used to check for OA data.
+	 *
+	 * 6: Whitelist OATRIGGER registers to allow user to trigger reports
+	 *    into the OA buffer. This applies only to gen8+.
 	 */
-	return 5;
+	return 6;
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
-- 
2.20.1

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[Intel-gfx] [PATCH 3/4] drm/i915/perf: Whitelist OA counter and buffer registers

[Umesh Nerlige Ramappa]

From: Piotr Maciejewski <piotr.maciejewski@intel.com>

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)

Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 34 +++++++++++++++++++
 .../gpu/drm/i915/gt/selftest_workarounds.c    | 21 +++++++++++-
 drivers/gpu/drm/i915/i915_perf.c              |  5 ++-
 drivers/gpu/drm/i915/i915_reg.h               | 10 ++++++
 4 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 582a2c8cd219..5dfa3177d216 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1370,6 +1370,23 @@ static void gen9_whitelist_build_performance_counters(struct i915_wa_list *w)
 	/* OA buffer trigger report 2/6 used by performance query */
 	whitelist_reg(w, OAREPORTTRIG2);
 	whitelist_reg(w, OAREPORTTRIG6);
+
+	/* Performance counters A18-20 used by tbs marker query */
+	whitelist_reg_ext(w, OA_PERF_COUNTER_A(18),
+			  RING_FORCE_TO_NONPRIV_ACCESS_RW |
+			  RING_FORCE_TO_NONPRIV_RANGE_4);
+
+	whitelist_reg(w, OA_PERF_COUNTER_A(20));
+	whitelist_reg(w, OA_PERF_COUNTER_A_UPPER(20));
+
+	/* Read access to gpu ticks */
+	whitelist_reg_ext(w, GEN8_GPU_TICKS,
+			  RING_FORCE_TO_NONPRIV_ACCESS_RD);
+
+	/* Read access to: oa status, head, tail, buffer settings */
+	whitelist_reg_ext(w, GEN8_OASTATUS,
+			  RING_FORCE_TO_NONPRIV_ACCESS_RD |
+			  RING_FORCE_TO_NONPRIV_RANGE_4);
 }
 
 static void gen12_whitelist_build_performance_counters(struct i915_wa_list *w)
@@ -1377,6 +1394,23 @@ static void gen12_whitelist_build_performance_counters(struct i915_wa_list *w)
 	/* OA buffer trigger report 2/6 used by performance query */
 	whitelist_reg(w, GEN12_OAG_OAREPORTTRIG2);
 	whitelist_reg(w, GEN12_OAG_OAREPORTTRIG6);
+
+	/* Performance counters A18-20 used by tbs marker query */
+	whitelist_reg_ext(w, GEN12_OAG_PERF_COUNTER_A(18),
+			  RING_FORCE_TO_NONPRIV_ACCESS_RW |
+			  RING_FORCE_TO_NONPRIV_RANGE_4);
+
+	whitelist_reg(w, GEN12_OAG_PERF_COUNTER_A(20));
+	whitelist_reg(w, GEN12_OAG_PERF_COUNTER_A_UPPER(20));
+
+	/* Read access to gpu ticks */
+	whitelist_reg_ext(w, GEN12_OAG_GPU_TICKS,
+			  RING_FORCE_TO_NONPRIV_ACCESS_RD);
+
+	/* Read access to: oa status, head, tail, buffer settings */
+	whitelist_reg_ext(w, GEN12_OAG_OASTATUS,
+			  RING_FORCE_TO_NONPRIV_ACCESS_RD |
+			  RING_FORCE_TO_NONPRIV_RANGE_4);
 }
 
 static void gen9_whitelist_build(struct i915_wa_list *w)
diff --git a/drivers/gpu/drm/i915/gt/selftest_workarounds.c b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
index c7d8af9ee34a..c160483c6ccc 100644
--- a/drivers/gpu/drm/i915/gt/selftest_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
@@ -431,6 +431,19 @@ static bool timestamp(const struct intel_engine_cs *engine, u32 reg)
 	}
 }
 
+static bool oa_gpu_ticks(u32 reg)
+{
+	reg = reg & ~RING_FORCE_TO_NONPRIV_ACCESS_MASK;
+	switch (reg) {
+	case 0x2910:
+	case 0xda90:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
 static bool ro_register(u32 reg)
 {
 	if ((reg & RING_FORCE_TO_NONPRIV_ACCESS_MASK) ==
@@ -511,7 +524,7 @@ static int check_dirty_whitelist(struct intel_context *ce)
 		if (wo_register(engine, reg))
 			continue;
 
-		if (timestamp(engine, reg))
+		if (timestamp(engine, reg) || oa_gpu_ticks(reg))
 			continue; /* timestamps are expected to autoincrement */
 
 		ro_reg = ro_register(reg);
@@ -938,6 +951,12 @@ static bool pardon_reg(struct drm_i915_private *i915, i915_reg_t reg)
 		{ OAREPORTTRIG6, INTEL_GEN_MASK(8, 11) },
 		{ GEN12_OAG_OAREPORTTRIG2, INTEL_GEN_MASK(12, 12) },
 		{ GEN12_OAG_OAREPORTTRIG6, INTEL_GEN_MASK(12, 12) },
+		{ OA_PERF_COUNTER_A(18), INTEL_GEN_MASK(8, 11) },
+		{ OA_PERF_COUNTER_A(20), INTEL_GEN_MASK(8, 11) },
+		{ OA_PERF_COUNTER_A_UPPER(20), INTEL_GEN_MASK(8, 11) },
+		{ GEN12_OAG_PERF_COUNTER_A(18), INTEL_GEN_MASK(12, 12) },
+		{ GEN12_OAG_PERF_COUNTER_A(20), INTEL_GEN_MASK(12, 12) },
+		{ GEN12_OAG_PERF_COUNTER_A_UPPER(20), INTEL_GEN_MASK(12, 12) },
 	};
 
 	return find_reg(i915, reg, pardon, ARRAY_SIZE(pardon));
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 30f6aeb819aa..453afeaee0a7 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -4450,8 +4450,11 @@ int i915_perf_ioctl_version(void)
 	 *
 	 * 6: Whitelist OATRIGGER registers to allow user to trigger reports
 	 *    into the OA buffer. This applies only to gen8+.
+	 *
+	 * 7: Whitelist OA buffer head/tail registers for user to identify the
+	 *    location of triggered reports into the OA buffer.
 	 */
-	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 1638f1282541..eeb41de84a0f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -675,6 +675,7 @@ 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_GPU_TICKS _MMIO(0x2910)
 #define GEN8_OASTATUS _MMIO(0x2b08)
 #define  GEN8_OASTATUS_OVERRUN_STATUS	    (1 << 3)
 #define  GEN8_OASTATUS_COUNTER_OVERFLOW     (1 << 2)
@@ -733,6 +734,7 @@ 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_GPU_TICKS _MMIO(0xda90)
 #define GEN12_OAG_OASTATUS _MMIO(0xdafc)
 #define  GEN12_OAG_OASTATUS_COUNTER_OVERFLOW (1 << 2)
 #define  GEN12_OAG_OASTATUS_BUFFER_OVERFLOW  (1 << 1)
@@ -974,6 +976,14 @@ 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)       _MMIO(0x2800 + 8 * (idx))
+#define OA_PERF_COUNTER_A_UPPER(idx) _MMIO(0x2800 + 8 * (idx) + 4)
+
+/* Gen12 Performance counters registers */
+#define GEN12_OAG_PERF_COUNTER_A(idx)       _MMIO(0xD980 + 8 * (idx))
+#define GEN12_OAG_PERF_COUNTER_A_UPPER(idx) _MMIO(0xD980 + 8 * (idx) + 4)
+
 /* Same layout as OASTARTTRIGX */
 #define GEN12_OAG_OASTARTTRIG1 _MMIO(0xd900)
 #define GEN12_OAG_OASTARTTRIG2 _MMIO(0xd904)
-- 
2.20.1

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[Intel-gfx] [PATCH 4/4] drm/i915/perf: Map OA buffer to user space for gen12 performance query

[Umesh Nerlige Ramappa]

From: Piotr Maciejewski <piotr.maciejewski@intel.com>

i915 used to support time based sampling mode which is good for overall
system monitoring, but is not enough for query mode used to measure a
single draw call or dispatch. Gen9-Gen11 are using current i915 perf
implementation for query, but Gen12+ requires a new approach for query
based on triggered reports within oa buffer.

Triggering reports into the OA buffer is achieved by writing into a
a trigger register. Optionally an unused counter/register is set with a
marker value such that a triggered report can be identified in the OA
buffer. Reports are usually triggered at the start and end of work that
is measured.

Since OA buffer is large and queries can be frequent, an efficient way
to look for triggered reports is required. By knowing the current head
and tail offsets into the OA buffer, it is easier to determine the
locality of the reports of interest.

Current perf OA interface does not expose head/tail information to the
user and it filters out invalid reports before sending data to user.
Also considering limited size of user buffer used during a query,
creating a 1:1 copy of the OA buffer at the user space added undesired
complexity.

The solution was to map the OA buffer to user space provided

(1) that it is accessed from a privileged user.
(2) OA report filtering is not used.

These 2 conditions would satisfy the safety criteria that the current
perf interface addresses.

To enable the query:
- Add an ioctl to expose head and tail to the user
- Add an ioctl to return size and offset of the OA buffer
- Map the OA buffer to the user space

v2:
- Improve commit message (Chris)
- Do not mmap based on gem object filp. Instead, use perf_fd and support
  mmap syscall (Chris)
- Pass non-zero offset in mmap to enforce the right object is mapped (Chris)
- Do not expose gpu_address (Chris)
- Verify start and length of vma for page alignment (Lionel)
- Move SQNTL config out (Lionel)

v3: (Chris)
- Omit redundant checks
- Return VM_FAULT_SIGBUS is old stream is closed
- Maintain reference counts to stream in vm_open and vm_close
- Use switch to identify object to be mapped

Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_mman.c |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h |   2 +
 drivers/gpu/drm/i915/i915_perf.c         | 196 ++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h   |  17 ++
 include/uapi/drm/i915_drm.h              |  32 ++++
 5 files changed, 245 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index b23368529a40..7c4b9b0c334b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -204,7 +204,7 @@ compute_partial_view(const struct drm_i915_gem_object *obj,
 	return view;
 }
 
-static vm_fault_t i915_error_to_vmf_fault(int err)
+vm_fault_t i915_error_to_vmf_fault(int err)
 {
 	switch (err) {
 	default:
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.h b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
index efee9e0d2508..1190a3a228ea 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
@@ -29,4 +29,6 @@ void i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj);
 
 void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj);
 
+vm_fault_t i915_error_to_vmf_fault(int err);
+
 #endif
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 453afeaee0a7..0e9696fc4ab2 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -192,10 +192,12 @@
  */
 
 #include <linux/anon_inodes.h>
+#include <linux/mman.h>
 #include <linux/sizes.h>
 #include <linux/uuid.h>
 
 #include "gem/i915_gem_context.h"
+#include "gem/i915_gem_mman.h"
 #include "gt/intel_engine_pm.h"
 #include "gt/intel_engine_user.h"
 #include "gt/intel_gt.h"
@@ -434,6 +436,30 @@ static u32 gen7_oa_hw_tail_read(struct i915_perf_stream *stream)
 	return oastatus1 & GEN7_OASTATUS1_TAIL_MASK;
 }
 
+static u32 gen12_oa_hw_head_read(struct i915_perf_stream *stream)
+{
+	struct intel_uncore *uncore = stream->uncore;
+
+	return intel_uncore_read(uncore, GEN12_OAG_OAHEADPTR) &
+	       GEN12_OAG_OAHEADPTR_MASK;
+}
+
+static u32 gen8_oa_hw_head_read(struct i915_perf_stream *stream)
+{
+	struct intel_uncore *uncore = stream->uncore;
+
+	return intel_uncore_read(uncore, GEN8_OAHEADPTR) &
+	       GEN8_OAHEADPTR_MASK;
+}
+
+static u32 gen7_oa_hw_head_read(struct i915_perf_stream *stream)
+{
+	struct intel_uncore *uncore = stream->uncore;
+	u32 oastatus2 = intel_uncore_read(uncore, GEN7_OASTATUS2);
+
+	return oastatus2 & GEN7_OASTATUS2_HEAD_MASK;
+}
+
 /**
  * oa_buffer_check_unlocked - check for data and update tail ptr state
  * @stream: i915 stream instance
@@ -1347,6 +1373,15 @@ free_noa_wait(struct i915_perf_stream *stream)
 	i915_vma_unpin_and_release(&stream->noa_wait, 0);
 }
 
+static void
+free_stream(struct kref *kref)
+{
+	struct i915_perf_stream *stream =
+		container_of(kref, typeof(*stream), refcount);
+
+	kfree(stream);
+}
+
 static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
 {
 	struct i915_perf *perf = stream->perf;
@@ -2934,6 +2969,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
 	stream->poll_check_timer.function = oa_poll_check_timer_cb;
 	init_waitqueue_head(&stream->poll_wq);
 	spin_lock_init(&stream->oa_buffer.ptr_lock);
+	kref_init(&stream->refcount);
 
 	return 0;
 
@@ -3214,6 +3250,69 @@ static long i915_perf_config_locked(struct i915_perf_stream *stream,
 	return ret;
 }
 
+/**
+ * i915_perf_oa_buffer_head_tail_locked - head and tail of the OA buffer
+ * @stream: i915 perf stream
+ * @arg: pointer to oa buffer head and tail filled by this function.
+ */
+static int i915_perf_oa_buffer_head_tail_locked(struct i915_perf_stream *stream,
+						unsigned long arg)
+{
+	struct drm_i915_perf_oa_buffer_head_tail ht;
+	void __user *output = (void __user *)arg;
+	u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma);
+
+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
+		DRM_DEBUG("Insufficient privileges to access OA buffer info\n");
+		return -EACCES;
+	}
+
+	if (!output)
+		return -EINVAL;
+
+	memset(&ht, 0, sizeof(ht));
+
+	ht.head = stream->perf->ops.oa_hw_head_read(stream) - gtt_offset;
+	ht.tail = stream->perf->ops.oa_hw_tail_read(stream) - gtt_offset;
+
+	if (copy_to_user(output, &ht, sizeof(ht)))
+		return -EFAULT;
+
+	return 0;
+}
+
+#define I915_PERF_OA_BUFFER_MMAP_OFFSET 1
+
+/**
+ * i915_perf_oa_buffer_info_locked - size and offset of the OA buffer
+ * @stream: i915 perf stream
+ * @arg: pointer to oa buffer info filled by this function.
+ */
+static int i915_perf_oa_buffer_info_locked(struct i915_perf_stream *stream,
+					   unsigned long arg)
+{
+	struct drm_i915_perf_oa_buffer_info info;
+	void __user *output = (void __user *)arg;
+
+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
+		DRM_DEBUG("Insufficient privileges to access OA buffer info\n");
+		return -EACCES;
+	}
+
+	if (!output)
+		return -EINVAL;
+
+	memset(&info, 0, sizeof(info));
+
+	info.size = stream->oa_buffer.vma->size;
+	info.offset = I915_PERF_OA_BUFFER_MMAP_OFFSET * PAGE_SIZE;
+
+	if (copy_to_user(output, &info, sizeof(info)))
+		return -EFAULT;
+
+	return 0;
+}
+
 /**
  * i915_perf_ioctl - support ioctl() usage with i915 perf stream FDs
  * @stream: An i915 perf stream
@@ -3239,6 +3338,10 @@ static long i915_perf_ioctl_locked(struct i915_perf_stream *stream,
 		return 0;
 	case I915_PERF_IOCTL_CONFIG:
 		return i915_perf_config_locked(stream, arg);
+	case I915_PERF_IOCTL_GET_OA_BUFFER_INFO:
+		return i915_perf_oa_buffer_info_locked(stream, arg);
+	case I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL:
+		return i915_perf_oa_buffer_head_tail_locked(stream, arg);
 	}
 
 	return -EINVAL;
@@ -3290,8 +3393,6 @@ static void i915_perf_destroy_locked(struct i915_perf_stream *stream)
 
 	if (stream->ctx)
 		i915_gem_context_put(stream->ctx);
-
-	kfree(stream);
 }
 
 /**
@@ -3314,12 +3415,93 @@ static int i915_perf_release(struct inode *inode, struct file *file)
 	i915_perf_destroy_locked(stream);
 	mutex_unlock(&perf->lock);
 
+	WRITE_ONCE(stream->closed, true);
+	unmap_mapping_range(file->f_mapping, 0, OA_BUFFER_SIZE, 1);
+
 	/* Release the reference the perf stream kept on the driver. */
 	drm_dev_put(&perf->i915->drm);
 
 	return 0;
 }
 
+static void vm_open_oa(struct vm_area_struct *vma)
+{
+	struct i915_perf_stream *stream = vma->vm_private_data;
+
+	GEM_BUG_ON(!stream);
+	kref_get(&stream->refcount);
+}
+
+static void vm_close_oa(struct vm_area_struct *vma)
+{
+	struct i915_perf_stream *stream = vma->vm_private_data;
+
+	GEM_BUG_ON(!stream);
+	kref_put(&stream->refcount, free_stream);
+}
+
+static vm_fault_t vm_fault_oa(struct vm_fault *vmf)
+{
+	struct vm_area_struct *vma = vmf->vma;
+	struct i915_perf_stream *stream = vma->vm_private_data;
+	struct drm_i915_gem_object *obj = stream->oa_buffer.vma->obj;
+	int err;
+
+	if (READ_ONCE(stream->closed))
+		return VM_FAULT_SIGBUS;
+
+	err = i915_gem_object_pin_pages(obj);
+	if (err)
+		goto out;
+
+	err = remap_io_sg(vma,
+			  vma->vm_start, vma->vm_end - vma->vm_start,
+			  obj->mm.pages->sgl, -1);
+
+	i915_gem_object_unpin_pages(obj);
+
+out:
+	return i915_error_to_vmf_fault(err);
+}
+
+static const struct vm_operations_struct vm_ops_oa = {
+	.open = vm_open_oa,
+	.close = vm_close_oa,
+	.fault = vm_fault_oa,
+};
+
+int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct i915_perf_stream *stream = file->private_data;
+
+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
+		DRM_DEBUG("Insufficient privileges to map OA buffer\n");
+		return -EACCES;
+	}
+
+	switch (vma->vm_pgoff) {
+	case I915_PERF_OA_BUFFER_MMAP_OFFSET:
+		if (vma->vm_end - vma->vm_start > OA_BUFFER_SIZE)
+			return -EINVAL;
+
+		if (vma->vm_flags & VM_WRITE)
+			return -EINVAL;
+
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC | VM_MAYSHARE);
+	vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+	vma->vm_private_data = stream;
+	vma->vm_ops = &vm_ops_oa;
+	vm_open_oa(vma);
+
+	return 0;
+}
 
 static const struct file_operations fops = {
 	.owner		= THIS_MODULE,
@@ -3332,6 +3514,7 @@ static const struct file_operations fops = {
 	 * to handle 32bits compatibility.
 	 */
 	.compat_ioctl   = i915_perf_ioctl,
+	.mmap		= i915_perf_mmap,
 };
 
 
@@ -4260,6 +4443,7 @@ void i915_perf_init(struct drm_i915_private *i915)
 		perf->ops.oa_disable = gen7_oa_disable;
 		perf->ops.read = gen7_oa_read;
 		perf->ops.oa_hw_tail_read = gen7_oa_hw_tail_read;
+		perf->ops.oa_hw_head_read = gen7_oa_hw_head_read;
 
 		perf->oa_formats = hsw_oa_formats;
 	} else if (HAS_LOGICAL_RING_CONTEXTS(i915)) {
@@ -4291,6 +4475,7 @@ void i915_perf_init(struct drm_i915_private *i915)
 			perf->ops.enable_metric_set = gen8_enable_metric_set;
 			perf->ops.disable_metric_set = gen8_disable_metric_set;
 			perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read;
+			perf->ops.oa_hw_head_read = gen8_oa_hw_head_read;
 
 			if (IS_GEN(i915, 8)) {
 				perf->ctx_oactxctrl_offset = 0x120;
@@ -4318,6 +4503,7 @@ void i915_perf_init(struct drm_i915_private *i915)
 			perf->ops.enable_metric_set = gen8_enable_metric_set;
 			perf->ops.disable_metric_set = gen10_disable_metric_set;
 			perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read;
+			perf->ops.oa_hw_head_read = gen8_oa_hw_head_read;
 
 			if (IS_GEN(i915, 10)) {
 				perf->ctx_oactxctrl_offset = 0x128;
@@ -4342,6 +4528,7 @@ void i915_perf_init(struct drm_i915_private *i915)
 			perf->ops.enable_metric_set = gen12_enable_metric_set;
 			perf->ops.disable_metric_set = gen12_disable_metric_set;
 			perf->ops.oa_hw_tail_read = gen12_oa_hw_tail_read;
+			perf->ops.oa_hw_head_read = gen12_oa_hw_head_read;
 
 			perf->ctx_flexeu0_offset = 0;
 			perf->ctx_oactxctrl_offset = 0x144;
@@ -4453,8 +4640,11 @@ int i915_perf_ioctl_version(void)
 	 *
 	 * 7: Whitelist OA buffer head/tail registers for user to identify the
 	 *    location of triggered reports into the OA buffer.
+	 *
+	 * 8: Added an option to map oa buffer at umd driver level and trigger
+	 *    oa reports within oa buffer from command buffer.
 	 */
-	return 7;
+	return 8;
 }
 
 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
index a36a455ae336..2efbe35c5fa9 100644
--- a/drivers/gpu/drm/i915/i915_perf_types.h
+++ b/drivers/gpu/drm/i915/i915_perf_types.h
@@ -311,6 +311,18 @@ struct i915_perf_stream {
 	 * buffer should be checked for available data.
 	 */
 	u64 poll_oa_period;
+
+	/**
+	 * @closed: Open or closed state of the stream.
+	 * True if stream is closed.
+	 */
+	bool closed;
+
+	/**
+	 * @refcount: References to the mapped OA buffer managed by this
+	 * stream.
+	 */
+	struct kref refcount;
 };
 
 /**
@@ -377,6 +389,11 @@ struct i915_oa_ops {
 	 * generations.
 	 */
 	u32 (*oa_hw_tail_read)(struct i915_perf_stream *stream);
+
+	/**
+	 * @oa_hw_head_read: read the OA head pointer register
+	 */
+	u32 (*oa_hw_head_read)(struct i915_perf_stream *stream);
 };
 
 struct i915_perf {
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 00546062e023..2042f6339182 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2048,6 +2048,38 @@ struct drm_i915_perf_open_param {
  */
 #define I915_PERF_IOCTL_CONFIG	_IO('i', 0x2)
 
+/**
+ * Returns OA buffer properties to be used with mmap.
+ *
+ * This ioctl is available in perf revision 8.
+ */
+#define I915_PERF_IOCTL_GET_OA_BUFFER_INFO _IO('i', 0x3)
+
+/**
+ * OA buffer size and offset.
+ */
+struct drm_i915_perf_oa_buffer_info {
+	__u32 size;
+	__u32 offset;
+	__u64 reserved[4];
+};
+
+/**
+ * Returns current position of OA buffer head and tail.
+ *
+ * This ioctl is available in perf revision 8.
+ */
+#define I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL _IO('i', 0x4)
+
+/**
+ * OA buffer head and tail.
+ */
+struct drm_i915_perf_oa_buffer_head_tail {
+	__u32 head;
+	__u32 tail;
+	__u64 reserved[4];
+};
+
 /**
  * Common to all i915 perf records
  */
-- 
2.20.1

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Re: [Intel-gfx] [PATCH 4/4] drm/i915/perf: Map OA buffer to user space for gen12 performance query

[Umesh Nerlige Ramappa]

Hi Chris,

I have added your comments, but I have a few questions below:

Thanks for your help,
Umesh

On Mon, Jul 20, 2020 at 07:00:12PM -0700, Umesh Nerlige Ramappa wrote:
>From: Piotr Maciejewski <piotr.maciejewski@intel.com>
>
>i915 used to support time based sampling mode which is good for overall
>system monitoring, but is not enough for query mode used to measure a
>single draw call or dispatch. Gen9-Gen11 are using current i915 perf
>implementation for query, but Gen12+ requires a new approach for query
>based on triggered reports within oa buffer.
>
>Triggering reports into the OA buffer is achieved by writing into a
>a trigger register. Optionally an unused counter/register is set with a
>marker value such that a triggered report can be identified in the OA
>buffer. Reports are usually triggered at the start and end of work that
>is measured.
>
>Since OA buffer is large and queries can be frequent, an efficient way
>to look for triggered reports is required. By knowing the current head
>and tail offsets into the OA buffer, it is easier to determine the
>locality of the reports of interest.
>
>Current perf OA interface does not expose head/tail information to the
>user and it filters out invalid reports before sending data to user.
>Also considering limited size of user buffer used during a query,
>creating a 1:1 copy of the OA buffer at the user space added undesired
>complexity.
>
>The solution was to map the OA buffer to user space provided
>
>(1) that it is accessed from a privileged user.
>(2) OA report filtering is not used.
>
>These 2 conditions would satisfy the safety criteria that the current
>perf interface addresses.
>
>To enable the query:
>- Add an ioctl to expose head and tail to the user
>- Add an ioctl to return size and offset of the OA buffer
>- Map the OA buffer to the user space
>
>v2:
>- Improve commit message (Chris)
>- Do not mmap based on gem object filp. Instead, use perf_fd and support
>  mmap syscall (Chris)
>- Pass non-zero offset in mmap to enforce the right object is mapped (Chris)
>- Do not expose gpu_address (Chris)
>- Verify start and length of vma for page alignment (Lionel)
>- Move SQNTL config out (Lionel)
>
>v3: (Chris)
>- Omit redundant checks
>- Return VM_FAULT_SIGBUS is old stream is closed
>- Maintain reference counts to stream in vm_open and vm_close
>- Use switch to identify object to be mapped
>
>Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
>Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
>---
> drivers/gpu/drm/i915/gem/i915_gem_mman.c |   2 +-
> drivers/gpu/drm/i915/gem/i915_gem_mman.h |   2 +
> drivers/gpu/drm/i915/i915_perf.c         | 196 ++++++++++++++++++++++-
> drivers/gpu/drm/i915/i915_perf_types.h   |  17 ++
> include/uapi/drm/i915_drm.h              |  32 ++++
> 5 files changed, 245 insertions(+), 4 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
>index b23368529a40..7c4b9b0c334b 100644
>--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
>+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
>@@ -204,7 +204,7 @@ compute_partial_view(const struct drm_i915_gem_object *obj,
> 	return view;
> }
>
>-static vm_fault_t i915_error_to_vmf_fault(int err)
>+vm_fault_t i915_error_to_vmf_fault(int err)
> {
> 	switch (err) {
> 	default:
>diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.h b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
>index efee9e0d2508..1190a3a228ea 100644
>--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.h
>+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.h
>@@ -29,4 +29,6 @@ void i915_gem_object_release_mmap_gtt(struct drm_i915_gem_object *obj);
>
> void i915_gem_object_release_mmap_offset(struct drm_i915_gem_object *obj);
>
>+vm_fault_t i915_error_to_vmf_fault(int err);
>+
> #endif
>diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
>index 453afeaee0a7..0e9696fc4ab2 100644
>--- a/drivers/gpu/drm/i915/i915_perf.c
>+++ b/drivers/gpu/drm/i915/i915_perf.c
>@@ -192,10 +192,12 @@
>  */
>
> #include <linux/anon_inodes.h>
>+#include <linux/mman.h>
> #include <linux/sizes.h>
> #include <linux/uuid.h>
>
> #include "gem/i915_gem_context.h"
>+#include "gem/i915_gem_mman.h"
> #include "gt/intel_engine_pm.h"
> #include "gt/intel_engine_user.h"
> #include "gt/intel_gt.h"
>@@ -434,6 +436,30 @@ static u32 gen7_oa_hw_tail_read(struct i915_perf_stream *stream)
> 	return oastatus1 & GEN7_OASTATUS1_TAIL_MASK;
> }
>
>+static u32 gen12_oa_hw_head_read(struct i915_perf_stream *stream)
>+{
>+	struct intel_uncore *uncore = stream->uncore;
>+
>+	return intel_uncore_read(uncore, GEN12_OAG_OAHEADPTR) &
>+	       GEN12_OAG_OAHEADPTR_MASK;
>+}
>+
>+static u32 gen8_oa_hw_head_read(struct i915_perf_stream *stream)
>+{
>+	struct intel_uncore *uncore = stream->uncore;
>+
>+	return intel_uncore_read(uncore, GEN8_OAHEADPTR) &
>+	       GEN8_OAHEADPTR_MASK;
>+}
>+
>+static u32 gen7_oa_hw_head_read(struct i915_perf_stream *stream)
>+{
>+	struct intel_uncore *uncore = stream->uncore;
>+	u32 oastatus2 = intel_uncore_read(uncore, GEN7_OASTATUS2);
>+
>+	return oastatus2 & GEN7_OASTATUS2_HEAD_MASK;
>+}
>+
> /**
>  * oa_buffer_check_unlocked - check for data and update tail ptr state
>  * @stream: i915 stream instance
>@@ -1347,6 +1373,15 @@ free_noa_wait(struct i915_perf_stream *stream)
> 	i915_vma_unpin_and_release(&stream->noa_wait, 0);
> }
>
>+static void
>+free_stream(struct kref *kref)
>+{
>+	struct i915_perf_stream *stream =
>+		container_of(kref, typeof(*stream), refcount);
>+
>+	kfree(stream);
>+}
>+
> static void i915_oa_stream_destroy(struct i915_perf_stream *stream)
> {
> 	struct i915_perf *perf = stream->perf;
>@@ -2934,6 +2969,7 @@ static int i915_oa_stream_init(struct i915_perf_stream *stream,
> 	stream->poll_check_timer.function = oa_poll_check_timer_cb;
> 	init_waitqueue_head(&stream->poll_wq);
> 	spin_lock_init(&stream->oa_buffer.ptr_lock);
>+	kref_init(&stream->refcount);
>
> 	return 0;
>
>@@ -3214,6 +3250,69 @@ static long i915_perf_config_locked(struct i915_perf_stream *stream,
> 	return ret;
> }
>
>+/**
>+ * i915_perf_oa_buffer_head_tail_locked - head and tail of the OA buffer
>+ * @stream: i915 perf stream
>+ * @arg: pointer to oa buffer head and tail filled by this function.
>+ */
>+static int i915_perf_oa_buffer_head_tail_locked(struct i915_perf_stream *stream,
>+						unsigned long arg)
>+{
>+	struct drm_i915_perf_oa_buffer_head_tail ht;
>+	void __user *output = (void __user *)arg;
>+	u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma);
>+
>+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
>+		DRM_DEBUG("Insufficient privileges to access OA buffer info\n");
>+		return -EACCES;
>+	}
>+
>+	if (!output)
>+		return -EINVAL;
>+
>+	memset(&ht, 0, sizeof(ht));
>+
>+	ht.head = stream->perf->ops.oa_hw_head_read(stream) - gtt_offset;
>+	ht.tail = stream->perf->ops.oa_hw_tail_read(stream) - gtt_offset;
>+
>+	if (copy_to_user(output, &ht, sizeof(ht)))
>+		return -EFAULT;
>+
>+	return 0;
>+}
>+
>+#define I915_PERF_OA_BUFFER_MMAP_OFFSET 1
>+
>+/**
>+ * i915_perf_oa_buffer_info_locked - size and offset of the OA buffer
>+ * @stream: i915 perf stream
>+ * @arg: pointer to oa buffer info filled by this function.
>+ */
>+static int i915_perf_oa_buffer_info_locked(struct i915_perf_stream *stream,
>+					   unsigned long arg)
>+{
>+	struct drm_i915_perf_oa_buffer_info info;
>+	void __user *output = (void __user *)arg;
>+
>+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
>+		DRM_DEBUG("Insufficient privileges to access OA buffer info\n");
>+		return -EACCES;
>+	}
>+
>+	if (!output)
>+		return -EINVAL;
>+
>+	memset(&info, 0, sizeof(info));
>+
>+	info.size = stream->oa_buffer.vma->size;
>+	info.offset = I915_PERF_OA_BUFFER_MMAP_OFFSET * PAGE_SIZE;
>+
>+	if (copy_to_user(output, &info, sizeof(info)))
>+		return -EFAULT;
>+
>+	return 0;
>+}
>+
> /**
>  * i915_perf_ioctl - support ioctl() usage with i915 perf stream FDs
>  * @stream: An i915 perf stream
>@@ -3239,6 +3338,10 @@ static long i915_perf_ioctl_locked(struct i915_perf_stream *stream,
> 		return 0;
> 	case I915_PERF_IOCTL_CONFIG:
> 		return i915_perf_config_locked(stream, arg);
>+	case I915_PERF_IOCTL_GET_OA_BUFFER_INFO:
>+		return i915_perf_oa_buffer_info_locked(stream, arg);
>+	case I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL:
>+		return i915_perf_oa_buffer_head_tail_locked(stream, arg);
> 	}
>
> 	return -EINVAL;
>@@ -3290,8 +3393,6 @@ static void i915_perf_destroy_locked(struct i915_perf_stream *stream)
>
> 	if (stream->ctx)
> 		i915_gem_context_put(stream->ctx);
>-
>-	kfree(stream);
> }
>
> /**
>@@ -3314,12 +3415,93 @@ static int i915_perf_release(struct inode *inode, struct file *file)
> 	i915_perf_destroy_locked(stream);
> 	mutex_unlock(&perf->lock);
>
>+	WRITE_ONCE(stream->closed, true);
>+	unmap_mapping_range(file->f_mapping, 0, OA_BUFFER_SIZE, 1);
>+
> 	/* Release the reference the perf stream kept on the driver. */
> 	drm_dev_put(&perf->i915->drm);
>
> 	return 0;
> }
>
>+static void vm_open_oa(struct vm_area_struct *vma)
>+{
>+	struct i915_perf_stream *stream = vma->vm_private_data;
>+
>+	GEM_BUG_ON(!stream);
>+	kref_get(&stream->refcount);

When user calls mmap, after this call the count is 2 (since kref_init 
started off the count with 1).

>+}
>+
>+static void vm_close_oa(struct vm_area_struct *vma)
>+{
>+	struct i915_perf_stream *stream = vma->vm_private_data;
>+
>+	GEM_BUG_ON(!stream);
>+	kref_put(&stream->refcount, free_stream);

When the user closes perf fd or calls unmap, vm_close_oa is called and 
refcount goes to 1, so not sure how the refcount goes to 0 so that 
free_stream is called. Should I kref_put when closing perf fd also?

>+}
>+
>+static vm_fault_t vm_fault_oa(struct vm_fault *vmf)
>+{
>+	struct vm_area_struct *vma = vmf->vma;
>+	struct i915_perf_stream *stream = vma->vm_private_data;
>+	struct drm_i915_gem_object *obj = stream->oa_buffer.vma->obj;
>+	int err;
>+
>+	if (READ_ONCE(stream->closed))
>+		return VM_FAULT_SIGBUS;
>+
>+	err = i915_gem_object_pin_pages(obj);
>+	if (err)
>+		goto out;
>+
>+	err = remap_io_sg(vma,
>+			  vma->vm_start, vma->vm_end - vma->vm_start,
>+			  obj->mm.pages->sgl, -1);
>+
>+	i915_gem_object_unpin_pages(obj);
>+
>+out:
>+	return i915_error_to_vmf_fault(err);
>+}
>+
>+static const struct vm_operations_struct vm_ops_oa = {
>+	.open = vm_open_oa,
>+	.close = vm_close_oa,
>+	.fault = vm_fault_oa,
>+};
>+
>+int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
>+{
>+	struct i915_perf_stream *stream = file->private_data;
>+
>+	if (i915_perf_stream_paranoid && !perfmon_capable()) {
>+		DRM_DEBUG("Insufficient privileges to map OA buffer\n");
>+		return -EACCES;
>+	}
>+
>+	switch (vma->vm_pgoff) {
>+	case I915_PERF_OA_BUFFER_MMAP_OFFSET:
>+		if (vma->vm_end - vma->vm_start > OA_BUFFER_SIZE)
>+			return -EINVAL;
>+
>+		if (vma->vm_flags & VM_WRITE)
>+			return -EINVAL;
>+
>+		break;
>+
>+	default:
>+		return -EINVAL;
>+	}
>+
>+	vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC | VM_MAYSHARE);
>+	vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
>+	vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
>+	vma->vm_private_data = stream;
>+	vma->vm_ops = &vm_ops_oa;
>+	vm_open_oa(vma);

I am calling the open explicitly here to get the reference, otherwise I 
don't see open being called by anyone/anything.

If user calls mmap multiple times, does he get a unique vma each time?
Do I need to track all of them (and their sizes) and then unmap them 
when perf_fd is closed?

>+
>+	return 0;
>+}
>
> static const struct file_operations fops = {
> 	.owner		= THIS_MODULE,
>@@ -3332,6 +3514,7 @@ static const struct file_operations fops = {
> 	 * to handle 32bits compatibility.
> 	 */
> 	.compat_ioctl   = i915_perf_ioctl,
>+	.mmap		= i915_perf_mmap,
> };
>
>
>@@ -4260,6 +4443,7 @@ void i915_perf_init(struct drm_i915_private *i915)
> 		perf->ops.oa_disable = gen7_oa_disable;
> 		perf->ops.read = gen7_oa_read;
> 		perf->ops.oa_hw_tail_read = gen7_oa_hw_tail_read;
>+		perf->ops.oa_hw_head_read = gen7_oa_hw_head_read;
>
> 		perf->oa_formats = hsw_oa_formats;
> 	} else if (HAS_LOGICAL_RING_CONTEXTS(i915)) {
>@@ -4291,6 +4475,7 @@ void i915_perf_init(struct drm_i915_private *i915)
> 			perf->ops.enable_metric_set = gen8_enable_metric_set;
> 			perf->ops.disable_metric_set = gen8_disable_metric_set;
> 			perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read;
>+			perf->ops.oa_hw_head_read = gen8_oa_hw_head_read;
>
> 			if (IS_GEN(i915, 8)) {
> 				perf->ctx_oactxctrl_offset = 0x120;
>@@ -4318,6 +4503,7 @@ void i915_perf_init(struct drm_i915_private *i915)
> 			perf->ops.enable_metric_set = gen8_enable_metric_set;
> 			perf->ops.disable_metric_set = gen10_disable_metric_set;
> 			perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read;
>+			perf->ops.oa_hw_head_read = gen8_oa_hw_head_read;
>
> 			if (IS_GEN(i915, 10)) {
> 				perf->ctx_oactxctrl_offset = 0x128;
>@@ -4342,6 +4528,7 @@ void i915_perf_init(struct drm_i915_private *i915)
> 			perf->ops.enable_metric_set = gen12_enable_metric_set;
> 			perf->ops.disable_metric_set = gen12_disable_metric_set;
> 			perf->ops.oa_hw_tail_read = gen12_oa_hw_tail_read;
>+			perf->ops.oa_hw_head_read = gen12_oa_hw_head_read;
>
> 			perf->ctx_flexeu0_offset = 0;
> 			perf->ctx_oactxctrl_offset = 0x144;
>@@ -4453,8 +4640,11 @@ int i915_perf_ioctl_version(void)
> 	 *
> 	 * 7: Whitelist OA buffer head/tail registers for user to identify the
> 	 *    location of triggered reports into the OA buffer.
>+	 *
>+	 * 8: Added an option to map oa buffer at umd driver level and trigger
>+	 *    oa reports within oa buffer from command buffer.
> 	 */
>-	return 7;
>+	return 8;
> }
>
> #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
>diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
>index a36a455ae336..2efbe35c5fa9 100644
>--- a/drivers/gpu/drm/i915/i915_perf_types.h
>+++ b/drivers/gpu/drm/i915/i915_perf_types.h
>@@ -311,6 +311,18 @@ struct i915_perf_stream {
> 	 * buffer should be checked for available data.
> 	 */
> 	u64 poll_oa_period;
>+
>+	/**
>+	 * @closed: Open or closed state of the stream.
>+	 * True if stream is closed.
>+	 */
>+	bool closed;

closed is part of the stream itself, so I cannot kfree(stream) until the 
refcount goes to 0.

>+
>+	/**
>+	 * @refcount: References to the mapped OA buffer managed by this
>+	 * stream.
>+	 */
>+	struct kref refcount;
> };
>
> /**
>@@ -377,6 +389,11 @@ struct i915_oa_ops {
> 	 * generations.
> 	 */
> 	u32 (*oa_hw_tail_read)(struct i915_perf_stream *stream);
>+
>+	/**
>+	 * @oa_hw_head_read: read the OA head pointer register
>+	 */
>+	u32 (*oa_hw_head_read)(struct i915_perf_stream *stream);
> };
>
> struct i915_perf {
>diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
>index 00546062e023..2042f6339182 100644
>--- a/include/uapi/drm/i915_drm.h
>+++ b/include/uapi/drm/i915_drm.h
>@@ -2048,6 +2048,38 @@ struct drm_i915_perf_open_param {
>  */
> #define I915_PERF_IOCTL_CONFIG	_IO('i', 0x2)
>
>+/**
>+ * Returns OA buffer properties to be used with mmap.
>+ *
>+ * This ioctl is available in perf revision 8.
>+ */
>+#define I915_PERF_IOCTL_GET_OA_BUFFER_INFO _IO('i', 0x3)
>+
>+/**
>+ * OA buffer size and offset.
>+ */
>+struct drm_i915_perf_oa_buffer_info {
>+	__u32 size;
>+	__u32 offset;
>+	__u64 reserved[4];
>+};
>+
>+/**
>+ * Returns current position of OA buffer head and tail.
>+ *
>+ * This ioctl is available in perf revision 8.
>+ */
>+#define I915_PERF_IOCTL_GET_OA_BUFFER_HEAD_TAIL _IO('i', 0x4)
>+
>+/**
>+ * OA buffer head and tail.
>+ */
>+struct drm_i915_perf_oa_buffer_head_tail {
>+	__u32 head;
>+	__u32 tail;
>+	__u64 reserved[4];
>+};
>+
> /**
>  * Common to all i915 perf records
>  */
>-- 
>2.20.1
>
>_______________________________________________
>Intel-gfx mailing list
>Intel-gfx@lists.freedesktop.org
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[Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for Allow privileged user to map the OA buffer (rev3)

[Patchwork]

== Series Details ==

Series: Allow privileged user to map the OA buffer (rev3)
URL   : https://patchwork.freedesktop.org/series/79460/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
60886d35a086 drm/i915/perf: Ensure observation logic is not clock gated
d11b49577d7e drm/i915/perf: Whitelist OA report trigger registers
3c4afc3f876c drm/i915/perf: Whitelist OA counter and buffer registers
a4bff43cce38 drm/i915/perf: Map OA buffer to user space for gen12 performance query
-:47: WARNING:COMMIT_LOG_LONG_LINE: Possible unwrapped commit description (prefer a maximum 75 chars per line)
#47: 
- Pass non-zero offset in mmap to enforce the right object is mapped (Chris)

total: 0 errors, 1 warnings, 0 checks, 372 lines checked


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[Intel-gfx] ✗ Fi.CI.SPARSE: warning for Allow privileged user to map the OA buffer (rev3)

[Patchwork]

== Series Details ==

Series: Allow privileged user to map the OA buffer (rev3)
URL   : https://patchwork.freedesktop.org/series/79460/
State : warning

== Summary ==

$ dim sparse --fast origin/drm-tip
Sparse version: v0.6.0
Fast mode used, each commit won't be checked separately.


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[Intel-gfx] ✗ Fi.CI.BAT: failure for Allow privileged user to map the OA buffer (rev3)

[Patchwork]

[-- Attachment #1.1: Type: text/plain, Size: 14104 bytes --]

== Series Details ==

Series: Allow privileged user to map the OA buffer (rev3)
URL   : https://patchwork.freedesktop.org/series/79460/
State : failure

== Summary ==

CI Bug Log - changes from CI_DRM_8768 -> Patchwork_18217
====================================================

Summary
-------

  **FAILURE**

  Serious unknown changes coming with Patchwork_18217 absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_18217, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/index.html

Possible new issues
-------------------

  Here are the unknown changes that may have been introduced in Patchwork_18217:

### IGT changes ###

#### Possible regressions ####

  * igt@i915_selftest@live@workarounds:
    - fi-tgl-u2:          [PASS][1] -> [DMESG-FAIL][2]
   [1]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-u2/igt@i915_selftest@live@workarounds.html
   [2]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-u2/igt@i915_selftest@live@workarounds.html
    - fi-skl-6700k2:      [PASS][3] -> [DMESG-FAIL][4]
   [3]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-skl-6700k2/igt@i915_selftest@live@workarounds.html
   [4]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-skl-6700k2/igt@i915_selftest@live@workarounds.html
    - fi-cml-s:           [PASS][5] -> [DMESG-FAIL][6]
   [5]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-cml-s/igt@i915_selftest@live@workarounds.html
   [6]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-cml-s/igt@i915_selftest@live@workarounds.html
    - fi-icl-y:           [PASS][7] -> [DMESG-FAIL][8]
   [7]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-icl-y/igt@i915_selftest@live@workarounds.html
   [8]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-icl-y/igt@i915_selftest@live@workarounds.html
    - fi-kbl-x1275:       [PASS][9] -> [DMESG-FAIL][10]
   [9]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-x1275/igt@i915_selftest@live@workarounds.html
   [10]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-x1275/igt@i915_selftest@live@workarounds.html
    - fi-cfl-guc:         [PASS][11] -> [DMESG-FAIL][12]
   [11]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-cfl-guc/igt@i915_selftest@live@workarounds.html
   [12]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-cfl-guc/igt@i915_selftest@live@workarounds.html
    - fi-tgl-y:           [PASS][13] -> [DMESG-FAIL][14]
   [13]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-y/igt@i915_selftest@live@workarounds.html
   [14]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-y/igt@i915_selftest@live@workarounds.html
    - fi-skl-guc:         [PASS][15] -> [DMESG-FAIL][16]
   [15]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-skl-guc/igt@i915_selftest@live@workarounds.html
   [16]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-skl-guc/igt@i915_selftest@live@workarounds.html
    - fi-skl-6600u:       [PASS][17] -> [DMESG-FAIL][18]
   [17]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-skl-6600u/igt@i915_selftest@live@workarounds.html
   [18]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-skl-6600u/igt@i915_selftest@live@workarounds.html
    - fi-kbl-8809g:       [PASS][19] -> [DMESG-FAIL][20]
   [19]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-8809g/igt@i915_selftest@live@workarounds.html
   [20]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-8809g/igt@i915_selftest@live@workarounds.html
    - fi-cfl-8700k:       [PASS][21] -> [DMESG-FAIL][22]
   [21]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-cfl-8700k/igt@i915_selftest@live@workarounds.html
   [22]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-cfl-8700k/igt@i915_selftest@live@workarounds.html
    - fi-kbl-r:           [PASS][23] -> [DMESG-FAIL][24]
   [23]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-r/igt@i915_selftest@live@workarounds.html
   [24]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-r/igt@i915_selftest@live@workarounds.html
    - fi-icl-u2:          [PASS][25] -> [DMESG-FAIL][26]
   [25]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-icl-u2/igt@i915_selftest@live@workarounds.html
   [26]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-icl-u2/igt@i915_selftest@live@workarounds.html
    - fi-cfl-8109u:       [PASS][27] -> [DMESG-FAIL][28]
   [27]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-cfl-8109u/igt@i915_selftest@live@workarounds.html
   [28]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-cfl-8109u/igt@i915_selftest@live@workarounds.html
    - fi-skl-lmem:        [PASS][29] -> [DMESG-FAIL][30]
   [29]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-skl-lmem/igt@i915_selftest@live@workarounds.html
   [30]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-skl-lmem/igt@i915_selftest@live@workarounds.html
    - fi-kbl-guc:         [PASS][31] -> [DMESG-FAIL][32]
   [31]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-guc/igt@i915_selftest@live@workarounds.html
   [32]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-guc/igt@i915_selftest@live@workarounds.html
    - fi-kbl-soraka:      [PASS][33] -> [DMESG-FAIL][34]
   [33]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-soraka/igt@i915_selftest@live@workarounds.html
   [34]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-soraka/igt@i915_selftest@live@workarounds.html
    - fi-cml-u2:          [PASS][35] -> [DMESG-FAIL][36]
   [35]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-cml-u2/igt@i915_selftest@live@workarounds.html
   [36]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-cml-u2/igt@i915_selftest@live@workarounds.html

  
#### Suppressed ####

  The following results come from untrusted machines, tests, or statuses.
  They do not affect the overall result.

  * igt@i915_selftest@live@workarounds:
    - {fi-tgl-dsi}:       [PASS][37] -> [DMESG-FAIL][38]
   [37]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-dsi/igt@i915_selftest@live@workarounds.html
   [38]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-dsi/igt@i915_selftest@live@workarounds.html
    - {fi-ehl-1}:         [PASS][39] -> [DMESG-FAIL][40]
   [39]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-ehl-1/igt@i915_selftest@live@workarounds.html
   [40]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-ehl-1/igt@i915_selftest@live@workarounds.html
    - {fi-kbl-7560u}:     [PASS][41] -> [DMESG-FAIL][42]
   [41]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-7560u/igt@i915_selftest@live@workarounds.html
   [42]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-7560u/igt@i915_selftest@live@workarounds.html

  
Known issues
------------

  Here are the changes found in Patchwork_18217 that come from known issues:

### IGT changes ###

#### Issues hit ####

  * igt@gem_flink_basic@basic:
    - fi-tgl-y:           [PASS][43] -> [DMESG-WARN][44] ([i915#402]) +1 similar issue
   [43]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-y/igt@gem_flink_basic@basic.html
   [44]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-y/igt@gem_flink_basic@basic.html

  * igt@i915_pm_rpm@basic-rte:
    - fi-tgl-y:           [PASS][45] -> [DMESG-WARN][46] ([i915#1982])
   [45]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-y/igt@i915_pm_rpm@basic-rte.html
   [46]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-y/igt@i915_pm_rpm@basic-rte.html

  * igt@i915_selftest@live@gt_lrc:
    - fi-tgl-u2:          [PASS][47] -> [DMESG-FAIL][48] ([i915#1233])
   [47]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-u2/igt@i915_selftest@live@gt_lrc.html
   [48]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-u2/igt@i915_selftest@live@gt_lrc.html

  * igt@i915_selftest@live@workarounds:
    - fi-apl-guc:         [PASS][49] -> [DMESG-FAIL][50] ([i915#1635])
   [49]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-apl-guc/igt@i915_selftest@live@workarounds.html
   [50]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-apl-guc/igt@i915_selftest@live@workarounds.html
    - fi-bxt-dsi:         [PASS][51] -> [DMESG-FAIL][52] ([i915#1635])
   [51]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-bxt-dsi/igt@i915_selftest@live@workarounds.html
   [52]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-bxt-dsi/igt@i915_selftest@live@workarounds.html

  
#### Possible fixes ####

  * igt@gem_exec_suspend@basic-s3:
    - fi-tgl-u2:          [FAIL][53] ([i915#1888]) -> [PASS][54]
   [53]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-u2/igt@gem_exec_suspend@basic-s3.html
   [54]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-u2/igt@gem_exec_suspend@basic-s3.html

  * igt@gem_mmap@basic:
    - fi-tgl-y:           [DMESG-WARN][55] ([i915#402]) -> [PASS][56]
   [55]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-tgl-y/igt@gem_mmap@basic.html
   [56]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-tgl-y/igt@gem_mmap@basic.html

  * igt@i915_module_load@reload:
    - fi-icl-y:           [DMESG-WARN][57] ([i915#1982]) -> [PASS][58]
   [57]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-icl-y/igt@i915_module_load@reload.html
   [58]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-icl-y/igt@i915_module_load@reload.html

  * igt@i915_selftest@live@blt:
    - fi-snb-2600:        [DMESG-FAIL][59] -> [PASS][60]
   [59]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-snb-2600/igt@i915_selftest@live@blt.html
   [60]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-snb-2600/igt@i915_selftest@live@blt.html

  * igt@kms_flip@basic-flip-vs-wf_vblank@c-edp1:
    - fi-icl-u2:          [DMESG-WARN][61] ([i915#1982]) -> [PASS][62]
   [61]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-icl-u2/igt@kms_flip@basic-flip-vs-wf_vblank@c-edp1.html
   [62]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-icl-u2/igt@kms_flip@basic-flip-vs-wf_vblank@c-edp1.html

  * igt@kms_flip@basic-flip-vs-wf_vblank@c-hdmi-a2:
    - fi-skl-guc:         [DMESG-WARN][63] ([i915#2203]) -> [PASS][64]
   [63]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-skl-guc/igt@kms_flip@basic-flip-vs-wf_vblank@c-hdmi-a2.html
   [64]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-skl-guc/igt@kms_flip@basic-flip-vs-wf_vblank@c-hdmi-a2.html

  
#### Warnings ####

  * igt@gem_exec_suspend@basic-s0:
    - fi-kbl-x1275:       [DMESG-WARN][65] ([i915#62] / [i915#92] / [i915#95]) -> [DMESG-WARN][66] ([i915#62] / [i915#92]) +3 similar issues
   [65]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-x1275/igt@gem_exec_suspend@basic-s0.html
   [66]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-x1275/igt@gem_exec_suspend@basic-s0.html

  * igt@i915_pm_rpm@module-reload:
    - fi-kbl-x1275:       [DMESG-FAIL][67] ([i915#62]) -> [SKIP][68] ([fdo#109271])
   [67]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-x1275/igt@i915_pm_rpm@module-reload.html
   [68]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-x1275/igt@i915_pm_rpm@module-reload.html

  * igt@kms_flip@basic-flip-vs-wf_vblank@a-dp1:
    - fi-kbl-x1275:       [DMESG-WARN][69] ([i915#62] / [i915#92]) -> [DMESG-WARN][70] ([i915#62] / [i915#92] / [i915#95]) +4 similar issues
   [69]: https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8768/fi-kbl-x1275/igt@kms_flip@basic-flip-vs-wf_vblank@a-dp1.html
   [70]: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/fi-kbl-x1275/igt@kms_flip@basic-flip-vs-wf_vblank@a-dp1.html

  
  {name}: This element is suppressed. This means it is ignored when computing
          the status of the difference (SUCCESS, WARNING, or FAILURE).

  [fdo#109271]: https://bugs.freedesktop.org/show_bug.cgi?id=109271
  [i915#1233]: https://gitlab.freedesktop.org/drm/intel/issues/1233
  [i915#1635]: https://gitlab.freedesktop.org/drm/intel/issues/1635
  [i915#1814]: https://gitlab.freedesktop.org/drm/intel/issues/1814
  [i915#1888]: https://gitlab.freedesktop.org/drm/intel/issues/1888
  [i915#1982]: https://gitlab.freedesktop.org/drm/intel/issues/1982
  [i915#2203]: https://gitlab.freedesktop.org/drm/intel/issues/2203
  [i915#402]: https://gitlab.freedesktop.org/drm/intel/issues/402
  [i915#62]: https://gitlab.freedesktop.org/drm/intel/issues/62
  [i915#92]: https://gitlab.freedesktop.org/drm/intel/issues/92
  [i915#95]: https://gitlab.freedesktop.org/drm/intel/issues/95


Participating hosts (46 -> 40)
------------------------------

  Missing    (6): fi-ilk-m540 fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-ctg-p8600 fi-byt-clapper 


Build changes
-------------

  * IGT: IGT_5741 -> IGTPW_4782
  * Linux: CI_DRM_8768 -> Patchwork_18217

  CI-20190529: 20190529
  CI_DRM_8768: cc11fe21674f094e902748b09efa4e87c8be434b @ git://anongit.freedesktop.org/gfx-ci/linux
  IGTPW_4782: https://intel-gfx-ci.01.org/tree/drm-tip/IGTPW_4782/index.html
  IGT_5741: 96a8c8c1371995b73916989880b29b01f5657ba3 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_18217: a4bff43cce3804009af49960dd860f3da647b0e1 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

a4bff43cce38 drm/i915/perf: Map OA buffer to user space for gen12 performance query
3c4afc3f876c drm/i915/perf: Whitelist OA counter and buffer registers
d11b49577d7e drm/i915/perf: Whitelist OA report trigger registers
60886d35a086 drm/i915/perf: Ensure observation logic is not clock gated

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_18217/index.html

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_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH 1/4] drm/i915/perf: Ensure observation logic is not clock gated

[Lionel Landwerlin]

On 21/07/2020 05:00, Umesh Nerlige Ramappa wrote:
> From: Piotr Maciejewski <piotr.maciejewski@intel.com>
>
> A clock gating switch can control if the performance monitoring and
> observation logic is enaled or not. Ensure that we enable the clocks.
>
> v2: Separate code from other patches (Lionel)
> v3: Reset PMON enable when disabling perf to save power (Lionel)
>
> Fixes: 00a7f0d7155c ("drm/i915/tgl: Add perf support on TGL")
> Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
> Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
> ---
>   drivers/gpu/drm/i915/i915_perf.c | 13 +++++++++++++
>   drivers/gpu/drm/i915/i915_reg.h  |  2 ++
>   2 files changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> index c6f6370283cf..fe408c327d3c 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -2493,6 +2493,14 @@ gen12_enable_metric_set(struct i915_perf_stream *stream,
>   			    (period_exponent << GEN12_OAG_OAGLBCTXCTRL_TIMER_PERIOD_SHIFT))
>   			    : 0);
>   
> +	/*
> +	 * Initialize Super Queue Internal Cnt Register
> +	 * Set PMON Enable in order to collect valid metrics.
> +	 */
> +	intel_uncore_write(uncore, GEN12_SQCNT1,
> +			   intel_uncore_read(uncore, GEN12_SQCNT1) |
> +			   GEN12_SQCNT1_PMON_ENABLE);
> +
>   	/*
>   	 * Update all contexts prior writing the mux configurations as we need
>   	 * to make sure all slices/subslices are ON before writing to NOA
> @@ -2552,6 +2560,11 @@ static void gen12_disable_metric_set(struct i915_perf_stream *stream)
>   
>   	/* Make sure we disable noa to save power. */
>   	intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0);
> +
> +	/* Reset PMON Enable to save power. */
> +	intel_uncore_write(uncore, GEN12_SQCNT1,
> +			   intel_uncore_read(uncore, GEN12_SQCNT1) &
> +			   ~GEN12_SQCNT1_PMON_ENABLE);
>   }
>   
>   static void gen7_oa_enable(struct i915_perf_stream *stream)
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index b9607ac3620d..1638f1282541 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -696,6 +696,8 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>   #define OABUFFER_SIZE_16M   (7 << 3)
>   
>   #define GEN12_OA_TLB_INV_CR _MMIO(0xceec)
> +#define GEN12_SQCNT1 _MMIO(0x8718)
> +#define  GEN12_SQCNT1_PMON_ENABLE (1 << 30)
>   
>   /* Gen12 OAR unit */
>   #define GEN12_OAR_OACONTROL _MMIO(0x2960)


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Intel-gfx@lists.freedesktop.org
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Re: [Intel-gfx] [PATCH 3/4] drm/i915/perf: Whitelist OA counter and buffer registers

[Lionel Landwerlin]

On 21/07/2020 05:00, Umesh Nerlige Ramappa wrote:
> From: Piotr Maciejewski <piotr.maciejewski@intel.com>
>
> 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)
>
> Signed-off-by: Piotr Maciejewski <piotr.maciejewski@intel.com>
> Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
> ---
>   drivers/gpu/drm/i915/gt/intel_workarounds.c   | 34 +++++++++++++++++++
>   .../gpu/drm/i915/gt/selftest_workarounds.c    | 21 +++++++++++-
>   drivers/gpu/drm/i915/i915_perf.c              |  5 ++-
>   drivers/gpu/drm/i915/i915_reg.h               | 10 ++++++
>   4 files changed, 68 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 582a2c8cd219..5dfa3177d216 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -1370,6 +1370,23 @@ static void gen9_whitelist_build_performance_counters(struct i915_wa_list *w)
>   	/* OA buffer trigger report 2/6 used by performance query */
>   	whitelist_reg(w, OAREPORTTRIG2);
>   	whitelist_reg(w, OAREPORTTRIG6);
> +
> +	/* Performance counters A18-20 used by tbs marker query */
> +	whitelist_reg_ext(w, OA_PERF_COUNTER_A(18),
> +			  RING_FORCE_TO_NONPRIV_ACCESS_RW |
> +			  RING_FORCE_TO_NONPRIV_RANGE_4);
> +
> +	whitelist_reg(w, OA_PERF_COUNTER_A(20));
> +	whitelist_reg(w, OA_PERF_COUNTER_A_UPPER(20));
> +
> +	/* Read access to gpu ticks */
> +	whitelist_reg_ext(w, GEN8_GPU_TICKS,
> +			  RING_FORCE_TO_NONPRIV_ACCESS_RD);
> +
> +	/* Read access to: oa status, head, tail, buffer settings */
> +	whitelist_reg_ext(w, GEN8_OASTATUS,
> +			  RING_FORCE_TO_NONPRIV_ACCESS_RD |
> +			  RING_FORCE_TO_NONPRIV_RANGE_4);
>   }
>   
>   static void gen12_whitelist_build_performance_counters(struct i915_wa_list *w)
> @@ -1377,6 +1394,23 @@ static void gen12_whitelist_build_performance_counters(struct i915_wa_list *w)
>   	/* OA buffer trigger report 2/6 used by performance query */
>   	whitelist_reg(w, GEN12_OAG_OAREPORTTRIG2);
>   	whitelist_reg(w, GEN12_OAG_OAREPORTTRIG6);
> +
> +	/* Performance counters A18-20 used by tbs marker query */
> +	whitelist_reg_ext(w, GEN12_OAG_PERF_COUNTER_A(18),
> +			  RING_FORCE_TO_NONPRIV_ACCESS_RW |
> +			  RING_FORCE_TO_NONPRIV_RANGE_4);
> +
> +	whitelist_reg(w, GEN12_OAG_PERF_COUNTER_A(20));
> +	whitelist_reg(w, GEN12_OAG_PERF_COUNTER_A_UPPER(20));
> +
> +	/* Read access to gpu ticks */
> +	whitelist_reg_ext(w, GEN12_OAG_GPU_TICKS,
> +			  RING_FORCE_TO_NONPRIV_ACCESS_RD);
> +
> +	/* Read access to: oa status, head, tail, buffer settings */
> +	whitelist_reg_ext(w, GEN12_OAG_OASTATUS,
> +			  RING_FORCE_TO_NONPRIV_ACCESS_RD |
> +			  RING_FORCE_TO_NONPRIV_RANGE_4);
>   }
>   
>   static void gen9_whitelist_build(struct i915_wa_list *w)
> diff --git a/drivers/gpu/drm/i915/gt/selftest_workarounds.c b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
> index c7d8af9ee34a..c160483c6ccc 100644
> --- a/drivers/gpu/drm/i915/gt/selftest_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/selftest_workarounds.c
> @@ -431,6 +431,19 @@ static bool timestamp(const struct intel_engine_cs *engine, u32 reg)
>   	}
>   }
>   
> +static bool oa_gpu_ticks(u32 reg)
> +{
> +	reg = reg & ~RING_FORCE_TO_NONPRIV_ACCESS_MASK;
> +	switch (reg) {
> +	case 0x2910:
> +	case 0xda90:
> +		return true;
> +
> +	default:
> +		return false;
> +	}
> +}
> +
>   static bool ro_register(u32 reg)
>   {
>   	if ((reg & RING_FORCE_TO_NONPRIV_ACCESS_MASK) ==
> @@ -511,7 +524,7 @@ static int check_dirty_whitelist(struct intel_context *ce)
>   		if (wo_register(engine, reg))
>   			continue;
>   
> -		if (timestamp(engine, reg))
> +		if (timestamp(engine, reg) || oa_gpu_ticks(reg))
>   			continue; /* timestamps are expected to autoincrement */
>   
>   		ro_reg = ro_register(reg);
> @@ -938,6 +951,12 @@ static bool pardon_reg(struct drm_i915_private *i915, i915_reg_t reg)
>   		{ OAREPORTTRIG6, INTEL_GEN_MASK(8, 11) },
>   		{ GEN12_OAG_OAREPORTTRIG2, INTEL_GEN_MASK(12, 12) },
>   		{ GEN12_OAG_OAREPORTTRIG6, INTEL_GEN_MASK(12, 12) },
> +		{ OA_PERF_COUNTER_A(18), INTEL_GEN_MASK(8, 11) },
> +		{ OA_PERF_COUNTER_A(20), INTEL_GEN_MASK(8, 11) },
> +		{ OA_PERF_COUNTER_A_UPPER(20), INTEL_GEN_MASK(8, 11) },
> +		{ GEN12_OAG_PERF_COUNTER_A(18), INTEL_GEN_MASK(12, 12) },
> +		{ GEN12_OAG_PERF_COUNTER_A(20), INTEL_GEN_MASK(12, 12) },
> +		{ GEN12_OAG_PERF_COUNTER_A_UPPER(20), INTEL_GEN_MASK(12, 12) },
>   	};
>   
>   	return find_reg(i915, reg, pardon, ARRAY_SIZE(pardon));
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> index 30f6aeb819aa..453afeaee0a7 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -4450,8 +4450,11 @@ int i915_perf_ioctl_version(void)
>   	 *
>   	 * 6: Whitelist OATRIGGER registers to allow user to trigger reports
>   	 *    into the OA buffer. This applies only to gen8+.
> +	 *
> +	 * 7: Whitelist OA buffer head/tail registers for user to identify the
> +	 *    location of triggered reports into the OA buffer.

You can complete the comment a little with :

    * whitelisting on OA buffer head/tail/status/buffer registers for 
readonly

    * whitelisting of 3 global A counter register in read/write

    * only applies to gen8+


With that :

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>


Thanks!


>   	 */
> -	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 1638f1282541..eeb41de84a0f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -675,6 +675,7 @@ 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_GPU_TICKS _MMIO(0x2910)
>   #define GEN8_OASTATUS _MMIO(0x2b08)
>   #define  GEN8_OASTATUS_OVERRUN_STATUS	    (1 << 3)
>   #define  GEN8_OASTATUS_COUNTER_OVERFLOW     (1 << 2)
> @@ -733,6 +734,7 @@ 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_GPU_TICKS _MMIO(0xda90)
>   #define GEN12_OAG_OASTATUS _MMIO(0xdafc)
>   #define  GEN12_OAG_OASTATUS_COUNTER_OVERFLOW (1 << 2)
>   #define  GEN12_OAG_OASTATUS_BUFFER_OVERFLOW  (1 << 1)
> @@ -974,6 +976,14 @@ 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)       _MMIO(0x2800 + 8 * (idx))
> +#define OA_PERF_COUNTER_A_UPPER(idx) _MMIO(0x2800 + 8 * (idx) + 4)
> +
> +/* Gen12 Performance counters registers */
> +#define GEN12_OAG_PERF_COUNTER_A(idx)       _MMIO(0xD980 + 8 * (idx))
> +#define GEN12_OAG_PERF_COUNTER_A_UPPER(idx) _MMIO(0xD980 + 8 * (idx) + 4)
> +
>   /* Same layout as OASTARTTRIGX */
>   #define GEN12_OAG_OASTARTTRIG1 _MMIO(0xd900)
>   #define GEN12_OAG_OASTARTTRIG2 _MMIO(0xd904)


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Re: [Intel-gfx] [PATCH 4/4] drm/i915/perf: Map OA buffer to user space for gen12 performance query

[Chris Wilson]

Quoting Umesh Nerlige Ramappa (2020-07-21 03:17:59)
> Hi Chris,
> 
> I have added your comments, but I have a few questions below:
> 
> Thanks for your help,
> Umesh
> 
> On Mon, Jul 20, 2020 at 07:00:12PM -0700, Umesh Nerlige Ramappa wrote:
> >From: Piotr Maciejewski <piotr.maciejewski@intel.com>
> >+static void vm_open_oa(struct vm_area_struct *vma)
> >+{
> >+      struct i915_perf_stream *stream = vma->vm_private_data;
> >+
> >+      GEM_BUG_ON(!stream);
> >+      kref_get(&stream->refcount);
> 
> When user calls mmap, after this call the count is 2 (since kref_init 
> started off the count with 1).
> 
> >+}
> >+
> >+static void vm_close_oa(struct vm_area_struct *vma)
> >+{
> >+      struct i915_perf_stream *stream = vma->vm_private_data;
> >+
> >+      GEM_BUG_ON(!stream);
> >+      kref_put(&stream->refcount, free_stream);
> 
> When the user closes perf fd or calls unmap, vm_close_oa is called and 
> refcount goes to 1, so not sure how the refcount goes to 0 so that 
> free_stream is called. Should I kref_put when closing perf fd also?

Yes, at a glance, I would say i915_perf_destroy_locked() should replace
the kfree(stream) with a kref_put.

> >+static vm_fault_t vm_fault_oa(struct vm_fault *vmf)
> >+{
> >+      struct vm_area_struct *vma = vmf->vma;
> >+      struct i915_perf_stream *stream = vma->vm_private_data;
> >+      struct drm_i915_gem_object *obj = stream->oa_buffer.vma->obj;
> >+      int err;
> >+
> >+      if (READ_ONCE(stream->closed))
> >+              return VM_FAULT_SIGBUS;
> >+
> >+      err = i915_gem_object_pin_pages(obj);
> >+      if (err)
> >+              goto out;
> >+
> >+      err = remap_io_sg(vma,
> >+                        vma->vm_start, vma->vm_end - vma->vm_start,
> >+                        obj->mm.pages->sgl, -1);
> >+
> >+      i915_gem_object_unpin_pages(obj);
> >+
> >+out:
> >+      return i915_error_to_vmf_fault(err);
> >+}
> >+
> >+static const struct vm_operations_struct vm_ops_oa = {
> >+      .open = vm_open_oa,
> >+      .close = vm_close_oa,
> >+      .fault = vm_fault_oa,
> >+};
> >+
> >+int i915_perf_mmap(struct file *file, struct vm_area_struct *vma)
> >+{
> >+      struct i915_perf_stream *stream = file->private_data;
> >+
> >+      if (i915_perf_stream_paranoid && !perfmon_capable()) {
> >+              DRM_DEBUG("Insufficient privileges to map OA buffer\n");
> >+              return -EACCES;
> >+      }
> >+
> >+      switch (vma->vm_pgoff) {
> >+      case I915_PERF_OA_BUFFER_MMAP_OFFSET:
> >+              if (vma->vm_end - vma->vm_start > OA_BUFFER_SIZE)
> >+                      return -EINVAL;
> >+
> >+              if (vma->vm_flags & VM_WRITE)
> >+                      return -EINVAL;
> >+
> >+              break;
> >+
> >+      default:
> >+              return -EINVAL;
> >+      }
> >+
> >+      vma->vm_flags &= ~(VM_MAYWRITE | VM_MAYEXEC | VM_MAYSHARE);
> >+      vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
> >+      vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
> >+      vma->vm_private_data = stream;
> >+      vma->vm_ops = &vm_ops_oa;
> >+      vm_open_oa(vma);
> 
> I am calling the open explicitly here to get the reference, otherwise I 
> don't see open being called by anyone/anything.

The initial vm_ops->open is implicit, i.e. the mmap starts opened, and
the vm_ops->open() is only called when the vma is cloned (e.g. on
fork()).

> If user calls mmap multiple times, does he get a unique vma each time?

Yes.

> Do I need to track all of them (and their sizes) and then unmap them 
> when perf_fd is closed?

Yes... But we can zap them all with a single unmap_mapping_range() call,
since they all exist within the perf_fd->f_mapping.

> >diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
> >index a36a455ae336..2efbe35c5fa9 100644
> >--- a/drivers/gpu/drm/i915/i915_perf_types.h
> >+++ b/drivers/gpu/drm/i915/i915_perf_types.h
> >@@ -311,6 +311,18 @@ struct i915_perf_stream {
> >        * buffer should be checked for available data.
> >        */
> >       u64 poll_oa_period;
> >+
> >+      /**
> >+       * @closed: Open or closed state of the stream.
> >+       * True if stream is closed.
> >+       */
> >+      bool closed;
> 
> closed is part of the stream itself, so I cannot kfree(stream) until the 
> refcount goes to 0.

Correct. kfree must be part of the kref_put cb.

> >+      /**
> >+       * @refcount: References to the mapped OA buffer managed by this
> >+       * stream.
> >+       */
> >+      struct kref refcount;
> > };
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Re: [Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

Hi Chris,

Okay to push this series?

Thanks,
Umesh

On Thu, Aug 20, 2020 at 11:01:56AM -0700, Umesh Nerlige Ramappa wrote:
>Allow user to map the OA buffer and also trigger reports into it.
>
>CI fixes:
>v1: Fixes a memory corruption due to addition of OA whitelist on demand.
>v2: Spinlock when applying whitelist
>v3: Use uncore->lock. Do not check for wal->count when applying whitelist.
>
>v4: Refresh and rerun with newly added test (forked access).
>
>Tests: https://patchwork.freedesktop.org/series/80761/
>Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
>Test-with: 20200818203547.24461-1-umesh.nerlige.ramappa@intel.com
>
>Piotr Maciejewski (1):
>  drm/i915/perf: Ensure observation logic is not clock gated
>
>Umesh Nerlige Ramappa (3):
>  drm/i915/perf: Whitelist OA report trigger registers
>  drm/i915/perf: Whitelist OA counter and buffer registers
>  drm/i915/perf: Map OA buffer to user space for gen12 performance query
>
> drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
> drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
> drivers/gpu/drm/i915/gt/intel_workarounds.c   | 153 +++++++++---
> drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
> .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
> drivers/gpu/drm/i915/i915_perf.c              | 225 +++++++++++++++++-
> drivers/gpu/drm/i915/i915_perf_types.h        |   5 +
> drivers/gpu/drm/i915/i915_reg.h               |  10 +
> include/uapi/drm/i915_drm.h                   |  33 +++
> 9 files changed, 402 insertions(+), 40 deletions(-)
>
>-- 
>2.20.1
>
>_______________________________________________
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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

Allow user to map the OA buffer and also trigger reports into it.

CI fixes:
v1: Fixes a memory corruption due to addition of OA whitelist on demand.
v2: Spinlock when applying whitelist
v3: Use uncore->lock. Do not check for wal->count when applying whitelist.

v4: Refresh and rerun with newly added test (forked access).

Tests: https://patchwork.freedesktop.org/series/80761/
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200818203547.24461-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (1):
  drm/i915/perf: Ensure observation logic is not clock gated

Umesh Nerlige Ramappa (3):
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 153 +++++++++---
 drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
 .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
 drivers/gpu/drm/i915/i915_perf.c              | 225 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   5 +
 drivers/gpu/drm/i915/i915_reg.h               |  10 +
 include/uapi/drm/i915_drm.h                   |  33 +++
 9 files changed, 402 insertions(+), 40 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

v1: Fixes a memory corruption due to addition of OA whitelist on demand.
v2: Spinlock when applying whitelist
v3: Use uncore->lock. Do not check for wal->count when applying whitelist.

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/80113/
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200730230002.55737-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (1):
  drm/i915/perf: Ensure observation logic is not clock gated

Umesh Nerlige Ramappa (3):
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 153 +++++++++---
 drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
 .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
 drivers/gpu/drm/i915/i915_perf.c              | 224 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   5 +
 drivers/gpu/drm/i915/i915_reg.h               |  10 +
 include/uapi/drm/i915_drm.h                   |  33 +++
 9 files changed, 401 insertions(+), 40 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

- Fixes a memory corruption due to addition of OA whitelist on demand.
- Spinlock when applying whitelist

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/80113/
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200730230002.55737-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (1):
  drm/i915/perf: Ensure observation logic is not clock gated

Umesh Nerlige Ramappa (3):
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_engine_types.h  |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 129 ++++++++--
 drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
 .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
 drivers/gpu/drm/i915/i915_perf.c              | 224 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   6 +
 drivers/gpu/drm/i915/i915_reg.h               |  10 +
 include/uapi/drm/i915_drm.h                   |  33 +++
 10 files changed, 392 insertions(+), 28 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

Fixes a memory corruption due to addition of OA whitelist on demand.

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/80113/
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200730230002.55737-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (1):
  drm/i915/perf: Ensure observation logic is not clock gated

Umesh Nerlige Ramappa (3):
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 122 ++++++++--
 drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
 .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
 drivers/gpu/drm/i915/i915_perf.c              | 224 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   6 +
 drivers/gpu/drm/i915/i915_reg.h               |  10 +
 include/uapi/drm/i915_drm.h                   |  33 +++
 9 files changed, 383 insertions(+), 28 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

Fixes a memory corruption due to addition of OA whitelist on demand.

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/80113/
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200730230002.55737-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (1):
  drm/i915/perf: Ensure observation logic is not clock gated

Umesh Nerlige Ramappa (3):
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 122 ++++++++--
 drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
 .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
 drivers/gpu/drm/i915/i915_perf.c              | 226 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   6 +
 drivers/gpu/drm/i915/i915_reg.h               |  10 +
 include/uapi/drm/i915_drm.h                   |  18 ++
 9 files changed, 370 insertions(+), 28 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/80113/

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200730230002.55737-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (1):
  drm/i915/perf: Ensure observation logic is not clock gated

Umesh Nerlige Ramappa (3):
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   | 109 +++++++--
 drivers/gpu/drm/i915/gt/intel_workarounds.h   |   7 +
 .../gpu/drm/i915/gt/intel_workarounds_types.h |   5 +
 drivers/gpu/drm/i915/i915_perf.c              | 226 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   6 +
 drivers/gpu/drm/i915/i915_reg.h               |  10 +
 include/uapi/drm/i915_drm.h                   |  18 ++
 9 files changed, 358 insertions(+), 27 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/79829/

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200724001521.35201-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (4):
  drm/i915/perf: Ensure observation logic is not clock gated
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   |  60 +++++
 .../gpu/drm/i915/gt/selftest_workarounds.c    |  38 ++-
 drivers/gpu/drm/i915/i915_perf.c              | 254 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |  17 ++
 drivers/gpu/drm/i915/i915_reg.h               |  12 +
 include/uapi/drm/i915_drm.h                   |  32 +++
 8 files changed, 411 insertions(+), 6 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/series/79745/

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200722053805.57139-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (4):
  drm/i915/perf: Ensure observation logic is not clock gated
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   |  60 +++++
 .../gpu/drm/i915/gt/selftest_workarounds.c    |  38 ++-
 drivers/gpu/drm/i915/i915_perf.c              | 239 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |  17 ++
 drivers/gpu/drm/i915/i915_reg.h               |  12 +
 include/uapi/drm/i915_drm.h                   |  32 +++
 8 files changed, 396 insertions(+), 6 deletions(-)

-- 
2.20.1

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[Intel-gfx] [PATCH 0/4] Allow privileged user to map the OA buffer

[Umesh Nerlige Ramappa]

This cover letter is included to trigger "Test-with" an IGT patch.

Tests - https://patchwork.freedesktop.org/patch/377905/?series=79617&rev=1

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Test-with: 20200717235842.68574-1-umesh.nerlige.ramappa@intel.com

Piotr Maciejewski (4):
  drm/i915/perf: Ensure observation logic is not clock gated
  drm/i915/perf: Whitelist OA report trigger registers
  drm/i915/perf: Whitelist OA counter and buffer registers
  drm/i915/perf: Map OA buffer to user space for gen12 performance query

 drivers/gpu/drm/i915/gem/i915_gem_mman.c      |   2 +-
 drivers/gpu/drm/i915/gem/i915_gem_mman.h      |   2 +
 drivers/gpu/drm/i915/gt/intel_workarounds.c   |  60 +++++++
 .../gpu/drm/i915/gt/selftest_workarounds.c    |  15 +-
 drivers/gpu/drm/i915/i915_perf.c              | 167 +++++++++++++++++-
 drivers/gpu/drm/i915/i915_perf_types.h        |   5 +
 drivers/gpu/drm/i915/i915_reg.h               |  12 ++
 include/uapi/drm/i915_drm.h                   |  32 ++++
 8 files changed, 290 insertions(+), 5 deletions(-)

-- 
2.20.1

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