[PATCH 3/3] intel: wait render timeout implementation

[Ben Widawsky]

int drm_intel_gem_bo_wait(drm_intel_bo *bo, uint64_t timeout_ns)

This should bump the libdrm version. We're waiting for context support
so we can do both features in one bump.

v2: don't return remaining timeout amount
use get param and fallback for older kernels

v3: only doing getparam at init
prototypes now have a signed input value

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 intel/intel_bufmgr.h     |    1 +
 intel/intel_bufmgr_gem.c |   30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
index c197abc..fa6c4dd 100644
--- a/intel/intel_bufmgr.h
+++ b/intel/intel_bufmgr.h
@@ -184,6 +184,7 @@ int drm_intel_get_pipe_from_crtc_id(drm_intel_bufmgr *bufmgr, int crtc_id);
 
 int drm_intel_get_aperture_sizes(int fd, size_t *mappable, size_t *total);
 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_bufmgr_fake.c */
 drm_intel_bufmgr *drm_intel_bufmgr_fake_init(int fd,
diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index b776d2f..048fca7 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -119,6 +119,7 @@ typedef struct _drm_intel_bufmgr_gem {
 	unsigned int has_blt : 1;
 	unsigned int has_relaxed_fencing : 1;
 	unsigned int has_llc : 1;
+	unsigned int has_wait_timeout : 1;
 	unsigned int bo_reuse : 1;
 	unsigned int no_exec : 1;
 	bool fenced_relocs;
@@ -1479,6 +1480,31 @@ drm_intel_gem_bo_wait_rendering(drm_intel_bo *bo)
 }
 
 /**
+ * Same as drm_intel_gem_bo_wait_rendering except a timeout parameter allows the
+ * operation to give up after a certain amount of time.
+ *
+ * A 0 return value implies that the wait was successful. Otherwise some
+ * negative return value describes the error.
+ */
+int drm_intel_gem_bo_wait(drm_intel_bo *bo, int64_t timeout_ns)
+{
+	drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *) bo->bufmgr;
+	drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
+	struct drm_i915_gem_wait wait;
+	int ret;
+
+	if (!bufmgr_gem->has_wait_timeout) {
+		drm_intel_gem_bo_wait_rendering(bo);
+		return 0;
+	}
+
+	wait.bo_handle = bo_gem->gem_handle;
+	wait.timeout_ns = timeout_ns;
+	wait.flags = 0;
+	return drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GEM_WAIT, &wait);
+}
+
+/**
  * Sets the object to the GTT read and possibly write domain, used by the X
  * 2D driver in the absence of kernel support to do drm_intel_gem_bo_map_gtt().
  *
@@ -2898,6 +2924,10 @@ drm_intel_bufmgr_gem_init(int fd, int batch_size)
 	ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);
 	bufmgr_gem->has_relaxed_fencing = ret == 0;
 
+	gp.param = I915_PARAM_HAS_WAIT_TIMEOUT;
+	ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);
+	bufmgr_gem->has_wait_timeout = ret == 0;
+
 	gp.param = I915_PARAM_HAS_LLC;
 	ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);
 	if (ret != 0) {
-- 
1.7.10.3