On Tue, Sep 06, 2022 at 10:35:16PM +0300, Lionel Landwerlin wrote:
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()
Will fix.
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;
This ^ may not work because append_oa_sample is appending exactly one report to the user buffer, whereas the above may append more than one.
Thanks, Umesh
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 */ };
