[Intel-gfx] [PATCH 04/16] drm/i915: Add ctx getparam ioctl parameter to retrieve ctx global 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 global_id for any particular ctx 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 global_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 6db5e3a..83d0d34 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -987,6 +987,9 @@ 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_GLOBAL_ID:
+		args->value = ctx->global_id;
+		break;
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 4a1bcfd8..7e24ec4 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_GLOBAL_ID	0x4
 	__u64 value;
 };
 
-- 
1.9.1