On 7 November 2016 at 19:49, Robert Bragg <robert@xxxxxxxxxxxxx> wrote:
> Adds base i915 perf infrastructure for Gen performance metrics.
>
> This adds a DRM_IOCTL_I915_PERF_OPEN ioctl that takes an array of uint64
> properties to configure a stream of metrics and returns a new fd usable
> with standard VFS system calls including read() to read typed and sized
> records; ioctl() to enable or disable capture and poll() to wait for
> data.
>
> A stream is opened something like:
>
> uint64_t properties[] = {
> /* Single context sampling */
> DRM_I915_PERF_PROP_CTX_HANDLE, ctx_handle,
>
> /* Include OA reports in samples */
> DRM_I915_PERF_PROP_SAMPLE_OA, true,
>
> /* OA unit configuration */
> DRM_I915_PERF_PROP_OA_METRICS_SET, metrics_set_id,
> DRM_I915_PERF_PROP_OA_FORMAT, report_format,
> DRM_I915_PERF_PROP_OA_EXPONENT, period_exponent,
> };
> struct drm_i915_perf_open_param parm = {
> .flags = I915_PERF_FLAG_FD_CLOEXEC |
> I915_PERF_FLAG_FD_NONBLOCK |
> I915_PERF_FLAG_DISABLED,
> .properties_ptr = (uint64_t)properties,
> .num_properties = sizeof(properties) / 16,
> };
> int fd = drmIoctl(drm_fd, DRM_IOCTL_I915_PERF_OPEN, ¶m);
>
> Records read all start with a common { type, size } header with
> DRM_I915_PERF_RECORD_SAMPLE being of most interest. Sample records
> contain an extensible number of fields and it's the
> DRM_I915_PERF_PROP_SAMPLE_xyz properties given when opening that
> determine what's included in every sample.
>
> No specific streams are supported yet so any attempt to open a stream
> will return an error.
>
> v2:
> use i915_gem_context_get() - Chris Wilson
> v3:
> update read() interface to avoid passing state struct - Chris Wilson
> fix some rebase fallout, with i915-perf init/deinit
> v4:
> s/DRM_IORW/DRM_IOW/ - Emil Velikov
>
> Signed-off-by: Robert Bragg <robert@xxxxxxxxxxxxx>
> Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Reviewed-by: Sourab Gupta <sourab.gupta@xxxxxxxxx>
Minor nit, there are a fair few DRM_ERROR's missing a new line.
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