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authorKeith Packard <keithp@keithp.com>2009-05-11 13:42:12 -0700
committerKeith Packard <keithp@keithp.com>2009-05-12 18:19:22 -0700
commit5b5ce301287fb8ef74b45fad3c10b2d4ac3a9cc6 (patch)
treee14e4df16fca0acd8c0c58cc81b4ca4eac6b5bba /libdrm/intel
parent628dc48a16ec6796ec5a81428e695837c51463d0 (diff)
libdrm/intel: add drm_intel_bo_disable_reuse api
Scanout buffers need to be freed through the kernel as it holds a reference to them; exposing this API allows applications allocating scanout buffers to flag them as not reusable. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'libdrm/intel')
-rw-r--r--libdrm/intel/intel_bufmgr.c7
-rw-r--r--libdrm/intel/intel_bufmgr.h2
-rw-r--r--libdrm/intel/intel_bufmgr_gem.c24
-rw-r--r--libdrm/intel/intel_bufmgr_priv.h10
4 files changed, 42 insertions, 1 deletions
diff --git a/libdrm/intel/intel_bufmgr.c b/libdrm/intel/intel_bufmgr.c
index 25a6828c..5057fe69 100644
--- a/libdrm/intel/intel_bufmgr.c
+++ b/libdrm/intel/intel_bufmgr.c
@@ -212,3 +212,10 @@ int drm_intel_bo_get_tiling(drm_intel_bo *bo, uint32_t *tiling_mode,
*swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
return 0;
}
+
+int drm_intel_bo_disable_reuse(drm_intel_bo *bo)
+{
+ if (bo->bufmgr->bo_disable_reuse)
+ return bo->bufmgr->bo_disable_reuse(bo);
+ return 0;
+}
diff --git a/libdrm/intel/intel_bufmgr.h b/libdrm/intel/intel_bufmgr.h
index 542dc06f..75d06cad 100644
--- a/libdrm/intel/intel_bufmgr.h
+++ b/libdrm/intel/intel_bufmgr.h
@@ -108,6 +108,8 @@ int drm_intel_bo_get_tiling(drm_intel_bo *bo, uint32_t *tiling_mode,
uint32_t *swizzle_mode);
int drm_intel_bo_flink(drm_intel_bo *bo, uint32_t *name);
+int drm_intel_bo_disable_reuse(drm_intel_bo *bo);
+
/* drm_intel_bufmgr_gem.c */
drm_intel_bufmgr *drm_intel_bufmgr_gem_init(int fd, int batch_size);
drm_intel_bo *drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
diff --git a/libdrm/intel/intel_bufmgr_gem.c b/libdrm/intel/intel_bufmgr_gem.c
index 89931d85..5ae4d668 100644
--- a/libdrm/intel/intel_bufmgr_gem.c
+++ b/libdrm/intel/intel_bufmgr_gem.c
@@ -166,6 +166,11 @@ struct _drm_intel_bo_gem {
char used_as_reloc_target;
/**
+ * Boolean of whether this buffer can be re-used
+ */
+ char reusable;
+
+ /**
* Size in bytes of this buffer and its relocation descendents.
*
* Used to avoid costly tree walking in drm_intel_bufmgr_check_aperture in
@@ -420,6 +425,7 @@ drm_intel_gem_bo_alloc_internal(drm_intel_bufmgr *bufmgr, const char *name,
bo_gem->used_as_reloc_target = 0;
bo_gem->tiling_mode = I915_TILING_NONE;
bo_gem->swizzle_mode = I915_BIT_6_SWIZZLE_NONE;
+ bo_gem->reusable = 1;
DBG("bo_create: buf %d (%s) %ldb\n",
bo_gem->gem_handle, bo_gem->name, size);
@@ -479,6 +485,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr, const char *name,
bo_gem->validate_index = -1;
bo_gem->gem_handle = open_arg.handle;
bo_gem->global_name = handle;
+ bo_gem->reusable = 0;
memset(&get_tiling, 0, sizeof(get_tiling));
get_tiling.handle = bo_gem->gem_handle;
@@ -572,7 +579,7 @@ drm_intel_gem_bo_unreference_locked(drm_intel_bo *bo)
bucket = drm_intel_gem_bo_bucket_for_size(bufmgr_gem, bo->size);
/* Put the buffer into our internal cache for reuse if we can. */
tiling_mode = I915_TILING_NONE;
- if (bo_gem->global_name == 0 &&
+ if (bo_gem->reusable &&
bucket != NULL &&
(bucket->max_entries == -1 ||
(bucket->max_entries > 0 &&
@@ -1168,6 +1175,7 @@ drm_intel_gem_bo_flink(drm_intel_bo *bo, uint32_t *name)
if (ret != 0)
return -errno;
bo_gem->global_name = flink.name;
+ bo_gem->reusable = 0;
}
*name = bo_gem->global_name;
@@ -1356,6 +1364,19 @@ drm_intel_gem_check_aperture_space(drm_intel_bo **bo_array, int count)
}
}
+/*
+ * Disable buffer reuse for objects which are shared with the kernel
+ * as scanout buffers
+ */
+static int
+drm_intel_gem_bo_disable_reuse(drm_intel_bo *bo)
+{
+ drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
+
+ bo_gem->reusable = 0;
+ return 0;
+}
+
/**
* Initializes the GEM buffer manager, which uses the kernel to allocate, map,
* and manage map buffer objections.
@@ -1437,6 +1458,7 @@ drm_intel_bufmgr_gem_init(int fd, int batch_size)
bufmgr_gem->bufmgr.destroy = drm_intel_bufmgr_gem_destroy;
bufmgr_gem->bufmgr.debug = 0;
bufmgr_gem->bufmgr.check_aperture_space = drm_intel_gem_check_aperture_space;
+ bufmgr_gem->bufmgr.bo_disable_reuse = drm_intel_gem_bo_disable_reuse;
/* Initialize the linked lists for BO reuse cache. */
for (i = 0; i < DRM_INTEL_GEM_BO_BUCKETS; i++)
DRMINITLISTHEAD(&bufmgr_gem->cache_bucket[i].head);
diff --git a/libdrm/intel/intel_bufmgr_priv.h b/libdrm/intel/intel_bufmgr_priv.h
index 82d87b4c..3484dee8 100644
--- a/libdrm/intel/intel_bufmgr_priv.h
+++ b/libdrm/intel/intel_bufmgr_priv.h
@@ -178,6 +178,16 @@ struct _drm_intel_bufmgr {
int (*bo_flink)(drm_intel_bo *bo, uint32_t *name);
int (*check_aperture_space)(drm_intel_bo **bo_array, int count);
+
+ /**
+ * Disable buffer reuse for buffers which will be shared in some way,
+ * as with scanout buffers. When the buffer reference count goes to zero,
+ * it will be freed and not placed in the reuse list.
+ *
+ * \param bo Buffer to disable reuse for
+ */
+ int (*bo_disable_reuse)(drm_intel_bo *bo);
+
int debug; /**< Enables verbose debugging printouts */
};