Re: [PATCH 02/19] drm/i915/perf: Add OA formats for DG2

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On 23/08/2022 23:41, Umesh Nerlige Ramappa wrote:
Add new OA formats for DG2. Some of the newer OA formats are not
multples of 64 bytes and are not powers of 2. For those formats, adjust
hw_tail accordingly when checking for new reports.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramampa@xxxxxxxxx>

Apart from the coding style issue :


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


---
  drivers/gpu/drm/i915/i915_perf.c | 63 ++++++++++++++++++++------------
  include/uapi/drm/i915_drm.h      |  6 +++
  2 files changed, 46 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 735244a3aedd..c8331b549d31 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -306,7 +306,8 @@ static u32 i915_oa_max_sample_rate = 100000;
/* XXX: beware if future OA HW adds new report formats that the current
   * code assumes all reports have a power-of-two size and ~(size - 1) can
- * be used as a mask to align the OA tail pointer.
+ * be used as a mask to align the OA tail pointer. In some of the
+ * formats, R is used to denote reserved field.
   */
  static const struct i915_oa_format oa_formats[I915_OA_FORMAT_MAX] = {
  	[I915_OA_FORMAT_A13]	    = { 0, 64 },
@@ -320,6 +321,10 @@ static const struct i915_oa_format oa_formats[I915_OA_FORMAT_MAX] = {
  	[I915_OA_FORMAT_A12]		    = { 0, 64 },
  	[I915_OA_FORMAT_A12_B8_C8]	    = { 2, 128 },
  	[I915_OA_FORMAT_A32u40_A4u32_B8_C8] = { 5, 256 },
+	[I915_OAR_FORMAT_A32u40_A4u32_B8_C8]    = { 5, 256 },
+	[I915_OA_FORMAT_A24u40_A14u32_B8_C8]    = { 5, 256 },
+	[I915_OAR_FORMAT_A36u64_B8_C8]		= { 1, 384 },
+	[I915_OA_FORMAT_A38u64_R2u64_B8_C8]	= { 1, 448 },
  };
#define SAMPLE_OA_REPORT (1<<0)
@@ -467,6 +472,7 @@ static bool oa_buffer_check_unlocked(struct i915_perf_stream *stream)
  	bool pollin;
  	u32 hw_tail;
  	u64 now;
+	u32 partial_report_size;
/* We have to consider the (unlikely) possibility that read() errors
  	 * could result in an OA buffer reset which might reset the head and
@@ -476,10 +482,16 @@ static bool oa_buffer_check_unlocked(struct i915_perf_stream *stream)
hw_tail = stream->perf->ops.oa_hw_tail_read(stream); - /* The tail pointer increases in 64 byte increments,
-	 * not in report_size steps...
+	/* The tail pointer increases in 64 byte increments, whereas report
+	 * sizes need not be integral multiples or 64 or powers of 2.
+	 * Compute potentially partially landed report in the OA buffer
  	 */
-	hw_tail &= ~(report_size - 1);
+	partial_report_size = OA_TAKEN(hw_tail, stream->oa_buffer.tail);
+	partial_report_size %= report_size;
+
+	/* Subtract partial amount off the tail */
+	hw_tail = gtt_offset + ((hw_tail - partial_report_size) &
+				(stream->oa_buffer.vma->size - 1));
now = ktime_get_mono_fast_ns(); @@ -601,6 +613,8 @@ static int append_oa_sample(struct i915_perf_stream *stream,
  {
  	int report_size = stream->oa_buffer.format_size;
  	struct drm_i915_perf_record_header header;
+	int report_size_partial;
+	u8 *oa_buf_end;
header.type = DRM_I915_PERF_RECORD_SAMPLE;
  	header.pad = 0;
@@ -614,7 +628,19 @@ static int append_oa_sample(struct i915_perf_stream *stream,
  		return -EFAULT;
  	buf += sizeof(header);
- if (copy_to_user(buf, report, report_size))
+	oa_buf_end = stream->oa_buffer.vaddr +
+		     stream->oa_buffer.vma->size;
+	report_size_partial = oa_buf_end - report;
+
+	if (report_size_partial < report_size) {
+		if(copy_to_user(buf, report, report_size_partial))
+			return -EFAULT;
+		buf += report_size_partial;
+
+		if(copy_to_user(buf, stream->oa_buffer.vaddr,
+				report_size - report_size_partial))
+			return -EFAULT;

I think the coding style requires you to use if () not if()


Just a suggestion : you could make this code deal with the partial bit as the main bit of the function :


oa_buf_end = stream->oa_buffer.vaddr +
	     stream->oa_buffer.vma->size;

report_size_partial = oa_buf_end - report;

if (copy_to_user(buf, report, report_size_partial))
	return -EFAULT;
buf += report_size_partial;

if (report_size_partial < report_size &&
    copy_to_user(buf, stream->oa_buffer.vaddr,
		report_size - report_size_partial))
	return -EFAULT;
buf += report_size - report_size_partial;


+	} else if (copy_to_user(buf, report, report_size))
  		return -EFAULT;
(*offset) += header.size;
@@ -684,8 +710,8 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
  	 * all a power of two).
  	 */
  	if (drm_WARN_ONCE(&uncore->i915->drm,
-			  head > OA_BUFFER_SIZE || head % report_size ||
-			  tail > OA_BUFFER_SIZE || tail % report_size,
+			  head > stream->oa_buffer.vma->size ||
+			  tail > stream->oa_buffer.vma->size,
  			  "Inconsistent OA buffer pointers: head = %u, tail = %u\n",
  			  head, tail))
  		return -EIO;
@@ -699,22 +725,6 @@ static int gen8_append_oa_reports(struct i915_perf_stream *stream,
  		u32 ctx_id;
  		u32 reason;
- /*
-		 * All the report sizes factor neatly into the buffer
-		 * size so we never expect to see a report split
-		 * between the beginning and end of the buffer.
-		 *
-		 * Given the initial alignment check a misalignment
-		 * here would imply a driver bug that would result
-		 * in an overrun.
-		 */
-		if (drm_WARN_ON(&uncore->i915->drm,
-				(OA_BUFFER_SIZE - head) < report_size)) {
-			drm_err(&uncore->i915->drm,
-				"Spurious OA head ptr: non-integral report offset\n");
-			break;
-		}
-
  		/*
  		 * The reason field includes flags identifying what
  		 * triggered this specific report (mostly timer
@@ -4513,6 +4523,13 @@ static void oa_init_supported_formats(struct i915_perf *perf)
  		oa_format_add(perf, I915_OA_FORMAT_C4_B8);
  		break;
+ case INTEL_DG2:
+		oa_format_add(perf, I915_OAR_FORMAT_A32u40_A4u32_B8_C8);
+		oa_format_add(perf, I915_OA_FORMAT_A24u40_A14u32_B8_C8);
+		oa_format_add(perf, I915_OAR_FORMAT_A36u64_B8_C8);
+		oa_format_add(perf, I915_OA_FORMAT_A38u64_R2u64_B8_C8);
+		break;
+
  	default:
  		MISSING_CASE(platform);
  	}
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 520ad2691a99..d20d723925b5 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -2650,6 +2650,12 @@ enum drm_i915_oa_format {
  	I915_OA_FORMAT_A12_B8_C8,
  	I915_OA_FORMAT_A32u40_A4u32_B8_C8,
+ /* DG2 */
+	I915_OAR_FORMAT_A32u40_A4u32_B8_C8,
+	I915_OA_FORMAT_A24u40_A14u32_B8_C8,
+	I915_OAR_FORMAT_A36u64_B8_C8,
+	I915_OA_FORMAT_A38u64_R2u64_B8_C8,
+
  	I915_OA_FORMAT_MAX	    /* non-ABI */
  };





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