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For Xe2+, when overrun mode is enabled, there are >no partial reports at the end of buffer, making the OA buffer effectively a >non-power-of-2 size circular buffer whose size, circ_size, is a multiple of >the report size. > >v2: Fix implementation of xe_oa_circ_diff/xe_oa_circ_incr (Umesh) > >Signed-off-by: Ashutosh Dixit Reviewed-by: Umesh Nerlige Ramappa Thanks, Umesh >--- > drivers/gpu/drm/xe/xe_oa.c | 35 ++++++++++++++++++++++++-------- > drivers/gpu/drm/xe/xe_oa_types.h | 3 +++ > 2 files changed, 30 insertions(+), 8 deletions(-) > >diff --git a/drivers/gpu/drm/xe/xe_oa.c b/drivers/gpu/drm/xe/xe_oa.c >index 6f5bbb0787d9..1ad17cc14532 100644 >--- a/drivers/gpu/drm/xe/xe_oa.c >+++ b/drivers/gpu/drm/xe/xe_oa.c >@@ -106,7 +106,14 @@ static const struct xe_oa_format oa_formats[] = { > > static u32 xe_oa_circ_diff(struct xe_oa_stream *stream, u32 tail, u32 head) > { >- return (tail - head) & (XE_OA_BUFFER_SIZE - 1); >+ return tail >= head ? tail - head : >+ tail + stream->oa_buffer.circ_size - head; >+} >+ >+static u32 xe_oa_circ_incr(struct xe_oa_stream *stream, u32 ptr, u32 n) >+{ >+ return ptr + n >= stream->oa_buffer.circ_size ? >+ ptr + n - stream->oa_buffer.circ_size : ptr + n; > } > > static void xe_oa_config_release(struct kref *ref) >@@ -280,7 +287,7 @@ static int xe_oa_append_report(struct xe_oa_stream *stream, char __user *buf, > > buf += *offset; > >- oa_buf_end = stream->oa_buffer.vaddr + XE_OA_BUFFER_SIZE; >+ oa_buf_end = stream->oa_buffer.vaddr + stream->oa_buffer.circ_size; > report_size_partial = oa_buf_end - report; > > if (report_size_partial < report_size) { >@@ -306,7 +313,6 @@ static int xe_oa_append_reports(struct xe_oa_stream *stream, char __user *buf, > int report_size = stream->oa_buffer.format->size; > u8 *oa_buf_base = stream->oa_buffer.vaddr; > u32 gtt_offset = xe_bo_ggtt_addr(stream->oa_buffer.bo); >- u32 mask = (XE_OA_BUFFER_SIZE - 1); > size_t start_offset = *offset; > unsigned long flags; > u32 head, tail; >@@ -317,21 +323,23 @@ static int xe_oa_append_reports(struct xe_oa_stream *stream, char __user *buf, > tail = stream->oa_buffer.tail; > spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); > >- xe_assert(stream->oa->xe, head < XE_OA_BUFFER_SIZE && tail < XE_OA_BUFFER_SIZE); >+ xe_assert(stream->oa->xe, >+ head < stream->oa_buffer.circ_size && tail < stream->oa_buffer.circ_size); > >- for (; xe_oa_circ_diff(stream, tail, head); head = (head + report_size) & mask) { >+ for (; xe_oa_circ_diff(stream, tail, head); >+ head = xe_oa_circ_incr(stream, head, report_size)) { > u8 *report = oa_buf_base + head; > > ret = xe_oa_append_report(stream, buf, count, offset, report); > if (ret) > break; > >- if (is_power_of_2(report_size)) { >+ if (!(stream->oa_buffer.circ_size % report_size)) { > /* Clear out report id and timestamp to detect unlanded reports */ > oa_report_id_clear(stream, (void *)report); > oa_timestamp_clear(stream, (void *)report); > } else { >- u8 *oa_buf_end = stream->oa_buffer.vaddr + XE_OA_BUFFER_SIZE; >+ u8 *oa_buf_end = stream->oa_buffer.vaddr + stream->oa_buffer.circ_size; > u32 part = oa_buf_end - report; > > /* Zero out the entire report */ >@@ -369,7 +377,6 @@ static void xe_oa_init_oa_buffer(struct xe_oa_stream *stream) > xe_mmio_write32(stream->gt, __oa_regs(stream)->oa_head_ptr, > gtt_offset & OAG_OAHEADPTR_MASK); > stream->oa_buffer.head = 0; >- > /* > * PRM says: "This MMIO must be set before the OATAILPTR register and after the > * OAHEADPTR register. This is to enable proper functionality of the overflow bit". >@@ -1256,6 +1263,18 @@ static int xe_oa_stream_init(struct xe_oa_stream *stream, > stream->periodic = param->period_exponent > 0; > stream->period_exponent = param->period_exponent; > >+ /* >+ * For Xe2+, when overrun mode is enabled, there are no partial reports at the end >+ * of buffer, making the OA buffer effectively a non-power-of-2 size circular >+ * buffer whose size, circ_size, is a multiple of the report size >+ */ >+ if (GRAPHICS_VER(stream->oa->xe) >= 20 && >+ stream->hwe->oa_unit->type == DRM_XE_OA_UNIT_TYPE_OAG && stream->sample) >+ stream->oa_buffer.circ_size = >+ XE_OA_BUFFER_SIZE - XE_OA_BUFFER_SIZE % stream->oa_buffer.format->size; >+ else >+ stream->oa_buffer.circ_size = XE_OA_BUFFER_SIZE; >+ > if (stream->exec_q && engine_supports_mi_query(stream->hwe)) { > /* If we don't find the context offset, just return error */ > ret = xe_oa_set_ctx_ctrl_offset(stream); >diff --git a/drivers/gpu/drm/xe/xe_oa_types.h b/drivers/gpu/drm/xe/xe_oa_types.h >index 6984e7d04be5..d8d5c9d8c22e 100644 >--- a/drivers/gpu/drm/xe/xe_oa_types.h >+++ b/drivers/gpu/drm/xe/xe_oa_types.h >@@ -163,6 +163,9 @@ struct xe_oa_buffer { > > /** @tail: The last verified cached tail where HW has completed writing */ > u32 tail; >+ >+ /** @circ_size: The effective circular buffer size, for Xe2+ */ >+ u32 circ_size; > }; > > /** >-- >2.41.0 >