This will allow mesa to determine if it needs to create a context, or
can reuse the default context. Reusing the default context saves memory,
and startup time.
To keep the libdrm interface as dumb as possible, we simply expose a
getter for the default context (which is only a real context when
thereis full PPGTT and per fd contexts). As such, callers can expect
NULL when this is not the case.
See the usage in mesa for details.
Cc: Kenneth Graunke <kenneth.w.graunke at intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
include/drm/i915_drm.h | 1 +
intel/intel_bufmgr.h | 1 +
intel/intel_bufmgr_gem.c | 30 ++++++++++++++++++++++++++++++
intel/intel_bufmgr_priv.h | 1 +
4 files changed, 33 insertions(+)
diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index 2f4eb8c..50b080e 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -337,6 +337,7 @@ typedef struct drm_i915_irq_wait {
#define I915_PARAM_HAS_EXEC_NO_RELOC 25
#define I915_PARAM_HAS_EXEC_HANDLE_LUT 26
#define I915_PARAM_HAS_WT 27
+#define I915_PARAM_HAS_FULL_PPGTT 28
typedef struct drm_i915_getparam {
int param;
diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
index 2eb9742..7f08093 100644
--- a/intel/intel_bufmgr.h
+++ b/intel/intel_bufmgr.h
@@ -191,6 +191,7 @@ 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);
+drm_intel_context * drm_intel_gem_default_context_get(drm_intel_bufmgr
*bufmgr);
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 ad722dd..dbd333a 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -126,6 +126,7 @@ typedef struct _drm_intel_bufmgr_gem {
unsigned int bo_reuse : 1;
unsigned int no_exec : 1;
unsigned int has_vebox : 1;
+ unsigned int has_full_ppgtt : 1;
bool fenced_relocs;
char *aub_filename;
@@ -3039,6 +3040,26 @@ drm_intel_gem_context_create(drm_intel_bufmgr *bufmgr)
return context;
}
+drm_intel_context *
+drm_intel_gem_default_context_get(drm_intel_bufmgr *bufmgr)
+{
+ drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *)bufmgr;
+ drm_intel_context *context = NULL;
+
+ if (!bufmgr_gem->has_full_ppgtt)
+ return NULL;
+
+ context = calloc(1, sizeof(*context));
+ if (!context)
+ return NULL;
+
+ context->ctx_id = 0;
+ context->bufmgr = bufmgr;
+ context->is_default = 1;
+
+ return context;
+}
+
void
drm_intel_gem_context_destroy(drm_intel_context *ctx)
{
@@ -3049,6 +3070,11 @@ drm_intel_gem_context_destroy(drm_intel_context *ctx)
if (ctx == NULL)
return;
+ if (ctx->is_default) {
+ free(ctx);
+ return;
+ }
+
VG_CLEAR(destroy);
bufmgr_gem = (drm_intel_bufmgr_gem *)ctx->bufmgr;
@@ -3267,6 +3293,10 @@ drm_intel_bufmgr_gem_init(int fd, int batch_size)
ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);
bufmgr_gem->has_vebox = (ret == 0) & (*gp.value > 0);
+ gp.param = I915_PARAM_HAS_FULL_PPGTT;
+ ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);
+ bufmgr_gem->has_full_ppgtt = (ret == 0) & (*gp.value > 0);
+
if (bufmgr_gem->gen < 4) {
gp.param = I915_PARAM_NUM_FENCES_AVAIL;
gp.value = &bufmgr_gem->available_fences;
diff --git a/intel/intel_bufmgr_priv.h b/intel/intel_bufmgr_priv.h
index 2592d42..e622746 100644
--- a/intel/intel_bufmgr_priv.h
+++ b/intel/intel_bufmgr_priv.h
@@ -283,6 +283,7 @@ struct _drm_intel_bufmgr {
struct _drm_intel_context {
unsigned int ctx_id;
struct _drm_intel_bufmgr *bufmgr;
+ int is_default;
};
#define ALIGN(value, alignment) ((value + alignment - 1) & ~(alignment
- 1))
--
1.8.5.2
