[Intel-gfx] [PATCH 01/15] drm/i915: Add ctx getparam ioctl parameter to retrieve ctx unique id

[sourab.gupta at intel.com]

From: Sourab Gupta <sourab.gupta at 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 i915 perf samples with their
particular ctx's, since those would be having ctx unique id's.
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 at 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 e974451..09f5178 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -1001,6 +1001,9 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 		else
 			args->value = to_i915(dev)->ggtt.base.total;
 		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 4a1bcfd8..0badc16 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1171,6 +1171,7 @@ struct drm_i915_gem_context_param {
 #define I915_CONTEXT_PARAM_BAN_PERIOD	0x1
 #define I915_CONTEXT_PARAM_NO_ZEROMAP	0x2
 #define I915_CONTEXT_PARAM_GTT_SIZE	0x3
+#define I915_CONTEXT_PARAM_HW_ID	0x4
 	__u64 value;
 };
 
-- 
1.9.1