[Intel-xe] [PATCH] drm/xe/pmu: Drop interrupt pmu event

[Aravind Iddamsetty]

Drop interrupt event from PMU as that is not useful and not being used
by any UMD.

Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Francois Dugast <francois.dugast at intel.com>
Signed-off-by: Aravind Iddamsetty <aravind.iddamsetty at linux.intel.com>
---
 drivers/gpu/drm/xe/xe_irq.c       | 18 ------------------
 drivers/gpu/drm/xe/xe_pmu.c       |  9 ---------
 drivers/gpu/drm/xe/xe_pmu_types.h |  8 --------
 include/uapi/drm/xe_drm.h         | 13 ++++++-------
 4 files changed, 6 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_irq.c b/drivers/gpu/drm/xe/xe_irq.c
index 61350ed32c61..29f539f1b94b 100644
--- a/drivers/gpu/drm/xe/xe_irq.c
+++ b/drivers/gpu/drm/xe/xe_irq.c
@@ -27,20 +27,6 @@
 #define IIR(offset)				XE_REG(offset + 0x8)
 #define IER(offset)				XE_REG(offset + 0xc)
 
-/*
- * Interrupt statistic for PMU. Increments the counter only if the
- * interrupt originated from the GPU so interrupts from a device which
- * shares the interrupt line are not accounted.
- */
-static __always_inline void xe_pmu_irq_stats(struct xe_device *xe)
-{
-	/*
-	 * A clever compiler translates that into INC. A not so clever one
-	 * should at least prevent store tearing.
-	 */
-	WRITE_ONCE(xe->pmu.irq_count, xe->pmu.irq_count + 1);
-}
-
 static void assert_iir_is_zero(struct xe_gt *mmio, struct xe_reg reg)
 {
 	u32 val = xe_mmio_read32(mmio, reg);
@@ -361,8 +347,6 @@ static irqreturn_t xelp_irq_handler(int irq, void *arg)
 
 	xe_display_irq_enable(xe, gu_misc_iir);
 
-	xe_pmu_irq_stats(xe);
-
 	return IRQ_HANDLED;
 }
 
@@ -459,8 +443,6 @@ static irqreturn_t dg1_irq_handler(int irq, void *arg)
 	dg1_intr_enable(xe, false);
 	xe_display_irq_enable(xe, gu_misc_iir);
 
-	xe_pmu_irq_stats(xe);
-
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/gpu/drm/xe/xe_pmu.c b/drivers/gpu/drm/xe/xe_pmu.c
index abfc0b3aeac4..318bbc9c1c9b 100644
--- a/drivers/gpu/drm/xe/xe_pmu.c
+++ b/drivers/gpu/drm/xe/xe_pmu.c
@@ -114,10 +114,6 @@ config_status(struct xe_device *xe, u64 config)
 		return -ENOENT;
 
 	switch (config_counter(config)) {
-	case XE_PMU_INTERRUPTS(0):
-		if (gt_id)
-			return -ENOENT;
-		break;
 	case XE_PMU_RENDER_GROUP_BUSY(0):
 	case XE_PMU_COPY_GROUP_BUSY(0):
 	case XE_PMU_ANY_ENGINE_GROUP_BUSY(0):
@@ -181,13 +177,9 @@ static u64 __xe_pmu_event_read(struct perf_event *event)
 	const unsigned int gt_id = config_gt_id(event->attr.config);
 	const u64 config = event->attr.config;
 	struct xe_gt *gt = xe_device_get_gt(xe, gt_id);
-	struct xe_pmu *pmu = &xe->pmu;
 	u64 val;
 
 	switch (config_counter(config)) {
-	case XE_PMU_INTERRUPTS(0):
-		val = READ_ONCE(pmu->irq_count);
-		break;
 	case XE_PMU_RENDER_GROUP_BUSY(0):
 	case XE_PMU_COPY_GROUP_BUSY(0):
 	case XE_PMU_ANY_ENGINE_GROUP_BUSY(0):
@@ -361,7 +353,6 @@ create_event_attributes(struct xe_pmu *pmu)
 		const char *unit;
 		bool global;
 	} events[] = {
-		__global_event(0, "interrupts", NULL),
 		__event(1, "render-group-busy", "ns"),
 		__event(2, "copy-group-busy", "ns"),
 		__event(3, "media-group-busy", "ns"),
diff --git a/drivers/gpu/drm/xe/xe_pmu_types.h b/drivers/gpu/drm/xe/xe_pmu_types.h
index 4ccc7e9042f6..9cadbd243f57 100644
--- a/drivers/gpu/drm/xe/xe_pmu_types.h
+++ b/drivers/gpu/drm/xe/xe_pmu_types.h
@@ -51,14 +51,6 @@ struct xe_pmu {
 	 *
 	 */
 	u64 sample[XE_PMU_MAX_GT][__XE_NUM_PMU_SAMPLERS];
-	/**
-	 * @irq_count: Number of interrupts
-	 *
-	 * Intentionally unsigned long to avoid atomics or heuristics on 32bit.
-	 * 4e9 interrupts are a lot and postprocessing can really deal with an
-	 * occasional wraparound easily. It's 32bit after all.
-	 */
-	unsigned long irq_count;
 	/**
 	 * @events_attr_group: Device events attribute group.
 	 */
diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
index 24bf8f0f52e8..be43ef0b92e6 100644
--- a/include/uapi/drm/xe_drm.h
+++ b/include/uapi/drm/xe_drm.h
@@ -1041,7 +1041,7 @@ struct drm_xe_vm_madvise {
  * in 'struct perf_event_attr' as part of perf_event_open syscall to read a
  * particular event.
  *
- * For example to open the XE_PMU_INTERRUPTS(0):
+ * For example to open the XE_PMU_RENDER_GROUP_BUSY(0):
  *
  * .. code-block:: C
  *
@@ -1055,7 +1055,7 @@ struct drm_xe_vm_madvise {
  *	attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED;
  *	attr.use_clockid = 1;
  *	attr.clockid = CLOCK_MONOTONIC;
- *	attr.config = XE_PMU_INTERRUPTS(0);
+ *	attr.config = XE_PMU_RENDER_GROUP_BUSY(0);
  *
  *	fd = syscall(__NR_perf_event_open, &attr, -1, cpu, -1, 0);
  */
@@ -1068,11 +1068,10 @@ struct drm_xe_vm_madvise {
 #define ___XE_PMU_OTHER(gt, x) \
 	(((__u64)(x)) | ((__u64)(gt) << __XE_PMU_GT_SHIFT))
 
-#define XE_PMU_INTERRUPTS(gt)			___XE_PMU_OTHER(gt, 0)
-#define XE_PMU_RENDER_GROUP_BUSY(gt)		___XE_PMU_OTHER(gt, 1)
-#define XE_PMU_COPY_GROUP_BUSY(gt)		___XE_PMU_OTHER(gt, 2)
-#define XE_PMU_MEDIA_GROUP_BUSY(gt)		___XE_PMU_OTHER(gt, 3)
-#define XE_PMU_ANY_ENGINE_GROUP_BUSY(gt)	___XE_PMU_OTHER(gt, 4)
+#define XE_PMU_RENDER_GROUP_BUSY(gt)		___XE_PMU_OTHER(gt, 0)
+#define XE_PMU_COPY_GROUP_BUSY(gt)		___XE_PMU_OTHER(gt, 1)
+#define XE_PMU_MEDIA_GROUP_BUSY(gt)		___XE_PMU_OTHER(gt, 2)
+#define XE_PMU_ANY_ENGINE_GROUP_BUSY(gt)	___XE_PMU_OTHER(gt, 3)
 
 #if defined(__cplusplus)
 }
-- 
2.25.1