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

[Robert Bragg <robert@sixbynine.org>]

I forgot that my recently sent out i915-perf i-g-t tests depend on this utility
api (not just my Mesa / GL_INTEL_performance_query patches).

Not all tests in i-g-t use libdrm to create contexts, but the i915-perf tests
use render_copy (drm_intel_context based) while testing single context
filtering and so want to pluck out the u32 ctx_id for passing to i915-perf.

I made a last moment tweak to the utility to return an error value separate
from a uint32_t output ctx_id pointer, so there will need to be a corresponding
tweak of the perf.c tests I sent out.

Regards,
- Robert

--- >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.

Signed-off: Robert Bragg <robert@sixbynine.org>
---
 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..7530fa5 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_context_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..cefe4a7 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_context_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

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