[PATCH 01/14] drm/i915: Add ctx getparam ioctl parameter to retrieve ctx unique id

[Sagar Arun Kamble <sagar.a.kamble@intel.com>]

From: Sourab Gupta <sourab.gupta@intel.com>

This patch adds a new ctx getparam ioctl parameter, which can be used to
retrieve ctx unique id by userspace.

This can be used by userspace to map the OA reports received in the
i915 perf samples with their associated ctx's (The OA reports have the
hw ctx ID information embedded for Gen8+).
Otherwise the userspace has no way of maintaining this association,
since it has the knowledge of only per-drm file specific ctx handles.

Signed-off-by: Sourab Gupta <sourab.gupta@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 3 +++
 include/uapi/drm/i915_drm.h             | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 58a2a44..2d7f1f0 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -1036,6 +1036,9 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 	case I915_CONTEXT_PARAM_BANNABLE:
 		args->value = i915_gem_context_is_bannable(ctx);
 		break;
+	case I915_CONTEXT_PARAM_HW_ID:
+		args->value = ctx->hw_id;
+		break;
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 6598fb7..92acfc2 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1358,6 +1358,7 @@ struct drm_i915_gem_context_param {
 #define I915_CONTEXT_PARAM_GTT_SIZE	0x3
 #define I915_CONTEXT_PARAM_NO_ERROR_CAPTURE	0x4
 #define I915_CONTEXT_PARAM_BANNABLE	0x5
+#define I915_CONTEXT_PARAM_HW_ID	0x6
 	__u64 value;
 };
 
-- 
1.9.1

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