[Intel-gfx] [PATCH v5 07/12] drm/i915/perf: Parse 64bit report header formats correctly
Umesh Nerlige Ramappa
umesh.nerlige.ramappa at intel.com
Thu Mar 16 00:09:27 UTC 2023
Now that OA formats come in flavor of 64 bit reports, the report header
has 64 bit report-id, timestamp, context-id and gpu-ticks fields. When
filtering these reports, use the right width for these fields.
Note that upper dword of context id is reserved, so squash lower dword
only.
v2: (Ashutosh)
- Drop inline
- Update comment with dword definitions - report id and timestamp
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>
---
drivers/gpu/drm/i915/i915_perf.c | 109 +++++++++++++++++++------
drivers/gpu/drm/i915/i915_perf_types.h | 6 ++
2 files changed, 90 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 536de16b83b3..8336430aa27f 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -441,6 +441,67 @@ static u32 gen7_oa_hw_tail_read(struct i915_perf_stream *stream)
return oastatus1 & GEN7_OASTATUS1_TAIL_MASK;
}
+#define oa_report_header_64bit(__s) \
+ ((__s)->oa_buffer.format->header == HDR_64_BIT)
+
+static u64 oa_report_id(struct i915_perf_stream *stream, void *report)
+{
+ return oa_report_header_64bit(stream) ? *(u64 *)report : *(u32 *)report;
+}
+
+static u64 oa_report_reason(struct i915_perf_stream *stream, void *report)
+{
+ return (oa_report_id(stream, report) >> OAREPORT_REASON_SHIFT) &
+ (GRAPHICS_VER(stream->perf->i915) == 12 ?
+ OAREPORT_REASON_MASK_EXTENDED :
+ OAREPORT_REASON_MASK);
+}
+
+static void oa_report_id_clear(struct i915_perf_stream *stream, u32 *report)
+{
+ if (oa_report_header_64bit(stream))
+ *(u64 *)report = 0;
+ else
+ *report = 0;
+}
+
+static bool oa_report_ctx_invalid(struct i915_perf_stream *stream, void *report)
+{
+ return !(oa_report_id(stream, report) &
+ stream->perf->gen8_valid_ctx_bit) &&
+ GRAPHICS_VER(stream->perf->i915) <= 11;
+}
+
+static u64 oa_timestamp(struct i915_perf_stream *stream, void *report)
+{
+ return oa_report_header_64bit(stream) ?
+ *((u64 *)report + 1) :
+ *((u32 *)report + 1);
+}
+
+static void oa_timestamp_clear(struct i915_perf_stream *stream, u32 *report)
+{
+ if (oa_report_header_64bit(stream))
+ *(u64 *)&report[2] = 0;
+ else
+ report[1] = 0;
+}
+
+static u32 oa_context_id(struct i915_perf_stream *stream, u32 *report)
+{
+ u32 ctx_id = oa_report_header_64bit(stream) ? report[4] : report[2];
+
+ return ctx_id & stream->specific_ctx_id_mask;
+}
+
+static void oa_context_id_squash(struct i915_perf_stream *stream, u32 *report)
+{
+ if (oa_report_header_64bit(stream))
+ report[4] = INVALID_CTX_ID;
+ else
+ report[2] = INVALID_CTX_ID;
+}
+
/**
* oa_buffer_check_unlocked - check for data and update tail ptr state
* @stream: i915 stream instance
@@ -509,21 +570,22 @@ static bool oa_buffer_check_unlocked(struct i915_perf_stream *stream)
hw_tail -= gtt_offset;
tail = hw_tail;
- /* Walk the stream backward until we find a report with dword 0
- * & 1 not at 0. Since the circular buffer pointers progress by
- * increments of 64 bytes and that reports can be up to 256
- * bytes long, we can't tell whether a report has fully landed
- * in memory before the first 2 dwords of the following report
- * have effectively landed.
+ /* Walk the stream backward until we find a report with report
+ * id and timestmap not at 0. Since the circular buffer pointers
+ * progress by increments of 64 bytes and that reports can be up
+ * to 256 bytes long, we can't tell whether a report has fully
+ * landed in memory before the report id and timestamp of the
+ * following report have effectively landed.
*
* This is assuming that the writes of the OA unit land in
* memory in the order they were written to.
* If not : (╯°□°）╯︵ ┻━┻
*/
while (OA_TAKEN(tail, aged_tail) >= report_size) {
- u32 *report32 = (void *)(stream->oa_buffer.vaddr + tail);
+ void *report = stream->oa_buffer.vaddr + tail;
- if (report32[0] != 0 || report32[1] != 0)
+ if (oa_report_id(stream, report) ||
+ oa_timestamp(stream, report))
break;
tail = (tail - report_size) & (OA_BUFFER_SIZE - 1);
@@ -702,7 +764,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
u8 *report = oa_buf_base + head;
u32 *report32 = (void *)report;
u32 ctx_id;
- u32 reason;
+ u64 reason;
/*
* All the report sizes factor neatly into the buffer
@@ -725,16 +787,12 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
* triggered this specific report (mostly timer
* triggered or e.g. due to a context switch).
*
- * This field is never expected to be zero so we can
- * check that the report isn't invalid before copying
- * it to userspace...
+ * In MMIO triggered reports, some platforms do not set the
+ * reason bit in this field and it is valid to have a reason
+ * field of zero.
*/
- reason = ((report32[0] >> OAREPORT_REASON_SHIFT) &
- (GRAPHICS_VER(stream->perf->i915) == 12 ?
- OAREPORT_REASON_MASK_EXTENDED :
- OAREPORT_REASON_MASK));
-
- ctx_id = report32[2] & stream->specific_ctx_id_mask;
+ reason = oa_report_reason(stream, report);
+ ctx_id = oa_context_id(stream, report32);
/*
* Squash whatever is in the CTX_ID field if it's marked as
@@ -744,9 +802,10 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
* Note: that we don't clear the valid_ctx_bit so userspace can
* understand that the ID has been squashed by the kernel.
*/
- if (!(report32[0] & stream->perf->gen8_valid_ctx_bit) &&
- GRAPHICS_VER(stream->perf->i915) <= 11)
- ctx_id = report32[2] = INVALID_CTX_ID;
+ if (oa_report_ctx_invalid(stream, report)) {
+ ctx_id = INVALID_CTX_ID;
+ oa_context_id_squash(stream, report32);
+ }
/*
* NB: For Gen 8 the OA unit no longer supports clock gating
@@ -790,7 +849,7 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
*/
if (stream->ctx &&
stream->specific_ctx_id != ctx_id) {
- report32[2] = INVALID_CTX_ID;
+ oa_context_id_squash(stream, report32);
}
ret = append_oa_sample(stream, buf, count, offset,
@@ -802,11 +861,11 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
}
/*
- * Clear out the first 2 dword as a mean to detect unlanded
+ * Clear out the report id and timestamp as a means to detect unlanded
* reports.
*/
- report32[0] = 0;
- report32[1] = 0;
+ oa_report_id_clear(stream, report32);
+ oa_timestamp_clear(stream, report32);
}
if (start_offset != *offset) {
diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
index 9b4e9fb8e95b..0342134a0012 100644
--- a/drivers/gpu/drm/i915/i915_perf_types.h
+++ b/drivers/gpu/drm/i915/i915_perf_types.h
@@ -38,9 +38,15 @@ enum {
PERF_GROUP_INVALID = U32_MAX,
};
+enum report_header {
+ HDR_32_BIT = 0,
+ HDR_64_BIT,
+};
+
struct i915_oa_format {
u32 format;
int size;
+ enum report_header header;
};
struct i915_oa_reg {
--
2.36.1
More information about the Intel-gfx
mailing list