Re: [PATCH v9 01/11] drm/i915: Add i915 perf infrastructure

[Matthew Auld <matthew.william.auld@gmail.com>]

On 7 November 2016 at 19:49, Robert Bragg <robert@sixbynine.org> 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, &param);
>
> 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@sixbynine.org>
> Reviewed-by: Matthew Auld <matthew.auld@intel.com>
> Reviewed-by: Sourab Gupta <sourab.gupta@intel.com>
Minor nit, there are a fair few DRM_ERROR's missing a new line.
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