[Intel-gfx] [RFC PATCH 1/2] drm/i915: Add perf property support for context HW id
Lionel Landwerlin
lionel.g.landwerlin at intel.com
Tue Jul 18 11:33:03 UTC 2017
On 18/07/17 08:51, Zhenyu Wang wrote:
> In order to support profiling for special context e.g vGPU context,
> we can expose vGPU context hw id and enable i915 perf property to
> get target context for profiling. This adds new perf property to
> assign target context with hw id.
>
> Jiao Pengyuan has helped to fix context reference bug in original code.
>
> Cc: Jiao, Pengyuan <pengyuan.jiao at intel.com>
> Cc: Niu, Bing <bing.niu at intel.com>
> Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> Cc: intel-gvt-dev at lists.freedesktop.org
> Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
> ---
> drivers/gpu/drm/i915/i915_perf.c | 37 +++++++++++++++++++++++++++++++++++++
> include/uapi/drm/i915_drm.h | 5 +++++
> 2 files changed, 42 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
> index d9f77a4d85db..350fd259b2d0 100644
> --- a/drivers/gpu/drm/i915/i915_perf.c
> +++ b/drivers/gpu/drm/i915/i915_perf.c
> @@ -348,7 +348,9 @@ struct perf_open_properties {
> u32 sample_flags;
>
> u64 single_context:1;
> + u64 single_context_hw:1;
> u64 ctx_handle;
> + u64 ctx_hw_id;
>
> /* OA sampling state */
> int metrics_set;
> @@ -2555,6 +2557,28 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
> }
> }
>
> + if (props->single_context_hw) {
> + struct i915_gem_context *ctx;
> +
> + mutex_lock(&dev_priv->drm.struct_mutex);
> + list_for_each_entry(ctx, &dev_priv->contexts.list, link) {
> + if (!i915_gem_context_is_default(ctx))
> + continue;
> +
> + if (ctx->hw_id == props->ctx_hw_id) {
> + specific_ctx = ctx;
> + i915_gem_context_get(specific_ctx);
> + break;
> + }
> + }
> + mutex_unlock(&dev_priv->drm.struct_mutex);
> +
> + if (!specific_ctx) {
> + DRM_DEBUG("Failed to look up HW context id.\n");
And you're missing setting ret = -ENOENT here :)
> + goto err;
> + }
> + }
> +
> /*
> * On Haswell the OA unit supports clock gating off for a specific
> * context and in this mode there's no visibility of metrics for the
> @@ -2708,6 +2732,14 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
> props->single_context = 1;
> props->ctx_handle = value;
> break;
> + case DRM_I915_PERF_PROP_CTX_HW_ID:
> + if (value >= MAX_CONTEXT_HW_ID) {
> + DRM_DEBUG("Invalid OA HW context ID\n");
> + return -EINVAL;
> + }
> + props->single_context_hw = 1;
> + props->ctx_hw_id = value;
> + break;
> case DRM_I915_PERF_PROP_SAMPLE_OA:
> props->sample_flags |= SAMPLE_OA_REPORT;
> break;
> @@ -2779,6 +2811,11 @@ static int read_properties_unlocked(struct drm_i915_private *dev_priv,
> uprop += 2;
> }
>
> + if (props->single_context && props->single_context_hw) {
> + DRM_DEBUG("Assign context handler and HW id simultaneously\n");
> + return -EINVAL;
> + }
> +
> return 0;
> }
>
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index 7ccbd6a2bbe0..ddafa556e290 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -1381,6 +1381,11 @@ enum drm_i915_perf_property_id {
> */
> DRM_I915_PERF_PROP_OA_EXPONENT,
>
> + /**
> + * The value specifies ctx with hw_id
> + */
> + DRM_I915_PERF_PROP_CTX_HW_ID,
> +
> DRM_I915_PERF_PROP_MAX /* non-ABI */
> };
>
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