[PATCH libdrm v2] intel: Add a getter for the intel_context ctx_id

[Robert Bragg]

Renamed to avoid the seemingly redundant 'context_' infix and note that it's
been reviewed by Matthew Auld.

--- >8 ---

Exposing the u32 context ID makes it possible to define new drm kernel
interfaces based on the same IDs that e.g. execbuf uses to identify a
gem context, that aren't themselves abstracted by libdrm but need to be
used by libdrm/drm_intel_context based clients such as (parts of) i-g-t
or Mesa.

For example this can be used to configure an i915-perf stream to collect
metrics for a specific context.

v2: s/drm_intel_gem_context_get_context_id/drm_intel_gem_context_get_id/

Signed-off: Robert Bragg <robert at sixbynine.org>
Reviewed-by: Matthew Auld <matthew.auld at intel.com>
---
 intel/intel_bufmgr.h     |  2 ++
 intel/intel_bufmgr_gem.c | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
index ce4e70d..85e4ff7 100644
--- a/intel/intel_bufmgr.h
+++ b/intel/intel_bufmgr.h
@@ -212,6 +212,8 @@ int drm_intel_bufmgr_gem_get_devid(drm_intel_bufmgr *bufmgr);
 int drm_intel_gem_bo_wait(drm_intel_bo *bo, int64_t timeout_ns);
 
 drm_intel_context *drm_intel_gem_context_create(drm_intel_bufmgr *bufmgr);
+int drm_intel_gem_context_get_id(drm_intel_context *ctx,
+                                 uint32_t *ctx_id);
 void drm_intel_gem_context_destroy(drm_intel_context *ctx);
 int drm_intel_gem_bo_context_exec(drm_intel_bo *bo, drm_intel_context *ctx,
 				  int used, unsigned int flags);
diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index 15c79b3..5fc022a 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -3184,6 +3184,17 @@ drm_intel_gem_context_create(drm_intel_bufmgr *bufmgr)
 	return context;
 }
 
+int
+drm_intel_gem_context_get_id(drm_intel_context *ctx, uint32_t *ctx_id)
+{
+	if (ctx == NULL)
+		return -EINVAL;
+
+	*ctx_id = ctx->ctx_id;
+
+	return 0;
+}
+
 void
 drm_intel_gem_context_destroy(drm_intel_context *ctx)
 {
-- 
2.10.1