From: Ankitprasad Sharma <ankitprasad.r.sha...@intel.com>
Propagating correct error codes to userspace by using ERR_PTR and
PTR_ERR macros for stolen memory based object allocation. We generally
return -ENOMEM to the user whenever there is a failure in object
allocation. This patch helps user to identify the correct reason for the
failure and not just -ENOMEM each time.
v2: Moved the patch up in the series, added error propagation for
i915_gem_alloc_object too (Chris)
v3: Removed storing of error pointer inside structs, Corrected error
propagation in caller functions (Chris)
v4: Remove assignments inside the predicate (Chris)
v5: Removed unnecessary initializations, updated kerneldoc for
i915_guc_client, corrected missed error pointer handling (Tvrtko)
v6: Use ERR_CAST/temporary variable to avoid storing invalid pointer
in a common field (Chris)
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sha...@intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 16 +++++----
drivers/gpu/drm/i915/i915_gem_batch_pool.c | 4 +--
drivers/gpu/drm/i915/i915_gem_context.c | 4 +--
drivers/gpu/drm/i915/i915_gem_render_state.c | 7 ++--
drivers/gpu/drm/i915/i915_gem_stolen.c | 53
+++++++++++++++-------------
drivers/gpu/drm/i915/i915_guc_submission.c | 52 +++++++++++++++++----------
drivers/gpu/drm/i915/intel_display.c | 2 +-
drivers/gpu/drm/i915/intel_fbdev.c | 6 ++--
drivers/gpu/drm/i915/intel_lrc.c | 10 +++---
drivers/gpu/drm/i915/intel_overlay.c | 4 +--
drivers/gpu/drm/i915/intel_pm.c | 7 ++--
drivers/gpu/drm/i915/intel_ringbuffer.c | 21 +++++------
12 files changed, 106 insertions(+), 80 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index cd7f0ae..31d66e0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -410,9 +410,9 @@ i915_gem_create(struct drm_file *file,
if (flags & I915_CREATE_PLACEMENT_STOLEN) {
mutex_lock(&dev->struct_mutex);
obj = i915_gem_object_create_stolen(dev, size);
- if (!obj) {
+ if (IS_ERR(obj)) {
mutex_unlock(&dev->struct_mutex);
- return -ENOMEM;
+ return PTR_ERR(obj);
}
/* Always clear fresh buffers before handing to userspace */
@@ -428,8 +428,8 @@ i915_gem_create(struct drm_file *file,
obj = i915_gem_alloc_object(dev, size);
}
- if (obj == NULL)
- return -ENOMEM;
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
ret = drm_gem_handle_create(file, &obj->base, &handle);
/* drop reference from allocate - handle holds it now */
@@ -4459,14 +4459,16 @@ struct drm_i915_gem_object
*i915_gem_alloc_object(struct drm_device *dev,
struct drm_i915_gem_object *obj;
struct address_space *mapping;
gfp_t mask;
+ int ret;
obj = i915_gem_object_alloc(dev);
if (obj == NULL)
- return NULL;
+ return ERR_PTR(-ENOMEM);
- if (drm_gem_object_init(dev, &obj->base, size) != 0) {
+ ret = drm_gem_object_init(dev, &obj->base, size);
+ if (ret) {
i915_gem_object_free(obj);
- return NULL;
+ return ERR_PTR(ret);
}
mask = GFP_HIGHUSER | __GFP_RECLAIMABLE;
diff --git a/drivers/gpu/drm/i915/i915_gem_batch_pool.c
b/drivers/gpu/drm/i915/i915_gem_batch_pool.c
index 7bf2f3f..d79caa2 100644
--- a/drivers/gpu/drm/i915/i915_gem_batch_pool.c
+++ b/drivers/gpu/drm/i915/i915_gem_batch_pool.c
@@ -135,8 +135,8 @@ i915_gem_batch_pool_get(struct i915_gem_batch_pool *pool,
int ret;
obj = i915_gem_alloc_object(pool->dev, size);
- if (obj == NULL)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(obj))
+ return obj;
ret = i915_gem_object_get_pages(obj);
if (ret)
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
b/drivers/gpu/drm/i915/i915_gem_context.c
index 43761c5..9754894 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -179,8 +179,8 @@ i915_gem_alloc_context_obj(struct drm_device *dev, size_t
size)
int ret;
obj = i915_gem_alloc_object(dev, size);
- if (obj == NULL)
- return ERR_PTR(-ENOMEM);
+ if (IS_ERR(obj))
+ return obj;
/*
* Try to make the context utilize L3 as well as LLC.
diff --git a/drivers/gpu/drm/i915/i915_gem_render_state.c
b/drivers/gpu/drm/i915/i915_gem_render_state.c
index 5026a62..2bfdd49 100644
--- a/drivers/gpu/drm/i915/i915_gem_render_state.c
+++ b/drivers/gpu/drm/i915/i915_gem_render_state.c
@@ -58,8 +58,11 @@ static int render_state_init(struct render_state *so, struct
drm_device *dev)
return -EINVAL;
so->obj = i915_gem_alloc_object(dev, 4096);
- if (so->obj == NULL)
- return -ENOMEM;
+ if (IS_ERR(so->obj)) {
+ ret = PTR_ERR(so->obj);
+ so->obj = NULL;
+ return ret;
+ }
ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
if (ret)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c
b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 17d679e..869ba25 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -492,6 +492,7 @@ i915_pages_create_for_stolen(struct drm_device *dev,
struct drm_i915_private *dev_priv = dev->dev_private;
struct sg_table *st;
struct scatterlist *sg;
+ int ret;
DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
BUG_ON(offset > dev_priv->gtt.stolen_size - size);
@@ -503,11 +504,12 @@ i915_pages_create_for_stolen(struct drm_device *dev,
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL)
- return NULL;
+ return ERR_PTR(-ENOMEM);
- if (sg_alloc_table(st, 1, GFP_KERNEL)) {
+ ret = sg_alloc_table(st, 1, GFP_KERNEL);
+ if (ret) {
kfree(st);
- return NULL;
+ return ERR_PTR(ret);
}
sg = st->sgl;
@@ -556,18 +558,23 @@ _i915_gem_object_create_stolen(struct drm_device *dev,
struct drm_mm_node *stolen)
{
struct drm_i915_gem_object *obj;
+ struct sg_table *pages;
obj = i915_gem_object_alloc(dev);
if (obj == NULL)
- return NULL;
+ return ERR_PTR(-ENOMEM);
drm_gem_private_object_init(dev, &obj->base, stolen->size);
i915_gem_object_init(obj, &i915_gem_object_stolen_ops);
- obj->pages = i915_pages_create_for_stolen(dev,
- stolen->start, stolen->size);
- if (obj->pages == NULL)
- goto cleanup;
+ pages = i915_pages_create_for_stolen(dev,
+ stolen->start, stolen->size);
+ if (IS_ERR(pages)) {
+ i915_gem_object_free(obj);
+ return ERR_CAST(pages);
+ }
+
+ obj->pages = pages;
obj->get_page.sg = obj->pages->sgl;
obj->get_page.last = 0;
@@ -579,10 +586,6 @@ _i915_gem_object_create_stolen(struct drm_device *dev,
obj->cache_level = HAS_LLC(dev) ? I915_CACHE_LLC : I915_CACHE_NONE;
return obj;
-
-cleanup:
- i915_gem_object_free(obj);
- return NULL;
}
struct drm_i915_gem_object *
@@ -594,29 +597,29 @@ i915_gem_object_create_stolen(struct drm_device *dev, u64
size)
int ret;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
- return NULL;
+ return ERR_PTR(-ENODEV);
DRM_DEBUG_KMS("creating stolen object: size=%llx\n", size);
if (size == 0)
- return NULL;
+ return ERR_PTR(-EINVAL);
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
- return NULL;
+ return ERR_PTR(-ENOMEM);
ret = i915_gem_stolen_insert_node(dev_priv, stolen, size, 4096);
if (ret) {
kfree(stolen);
- return NULL;
+ return ERR_PTR(ret);
}
obj = _i915_gem_object_create_stolen(dev, stolen);
- if (obj)
+ if (!IS_ERR(obj))
return obj;
i915_gem_stolen_remove_node(dev_priv, stolen);
kfree(stolen);
- return NULL;
+ return obj;
}
struct drm_i915_gem_object *
@@ -633,7 +636,7 @@ i915_gem_object_create_stolen_for_preallocated(struct
drm_device *dev,
int ret;
if (!drm_mm_initialized(&dev_priv->mm.stolen))
- return NULL;
+ return ERR_PTR(-ENODEV);
DRM_DEBUG_KMS("creating preallocated stolen object: stolen_offset=%x,
gtt_offset=%x, size=%x\n",
stolen_offset, gtt_offset, size);
@@ -641,11 +644,11 @@ i915_gem_object_create_stolen_for_preallocated(struct
drm_device *dev,
/* KISS and expect everything to be page-aligned */
if (WARN_ON(size == 0) || WARN_ON(size & 4095) ||
WARN_ON(stolen_offset & 4095))
- return NULL;
+ return ERR_PTR(-EINVAL);
stolen = kzalloc(sizeof(*stolen), GFP_KERNEL);
if (!stolen)
- return NULL;
+ return ERR_PTR(-ENOMEM);
stolen->start = stolen_offset;
stolen->size = size;
@@ -655,15 +658,15 @@ i915_gem_object_create_stolen_for_preallocated(struct
drm_device *dev,
if (ret) {
DRM_DEBUG_KMS("failed to allocate stolen space\n");
kfree(stolen);
- return NULL;
+ return ERR_PTR(ret);
}
obj = _i915_gem_object_create_stolen(dev, stolen);
- if (obj == NULL) {
+ if (IS_ERR(obj)) {
DRM_DEBUG_KMS("failed to allocate stolen object\n");
i915_gem_stolen_remove_node(dev_priv, stolen);
kfree(stolen);
- return NULL;
+ return obj;
}
/* Some objects just need physical mem from stolen space */
@@ -701,5 +704,5 @@ i915_gem_object_create_stolen_for_preallocated(struct
drm_device *dev,
err:
drm_gem_object_unreference(&obj->base);
- return NULL;
+ return ERR_PTR(ret);
}
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c
b/drivers/gpu/drm/i915/i915_guc_submission.c
index 0d23785b..ac042c6 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -629,27 +629,30 @@ int i915_guc_submit(struct i915_guc_client *client,
* object needs to be pinned lifetime. Also we must pin it to gtt space other
* than [0, GUC_WOPCM_TOP) because this range is reserved inside GuC.
*
- * Return: A drm_i915_gem_object if successful, otherwise NULL.
+ * Return: A drm_i915_gem_object if successful, otherwise error pointer.
*/
static struct drm_i915_gem_object *gem_allocate_guc_obj(struct drm_device
*dev,
u32 size)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct drm_i915_gem_object *obj;
+ int ret;
obj = i915_gem_alloc_object(dev, size);
- if (!obj)
- return NULL;
+ if (IS_ERR(obj))
+ return obj;
- if (i915_gem_object_get_pages(obj)) {
+ ret = i915_gem_object_get_pages(obj);
+ if (ret) {
drm_gem_object_unreference(&obj->base);
- return NULL;
+ return ERR_PTR(ret);
}
- if (i915_gem_obj_ggtt_pin(obj, PAGE_SIZE,
- PIN_OFFSET_BIAS | GUC_WOPCM_TOP)) {
+ ret = i915_gem_obj_ggtt_pin(obj, PAGE_SIZE,
+ PIN_OFFSET_BIAS | GUC_WOPCM_TOP);
+ if (ret) {
drm_gem_object_unreference(&obj->base);
- return NULL;
+ return ERR_PTR(ret);
}
/* Invalidate GuC TLB to let GuC take the latest updates to GTT. */
@@ -717,7 +720,7 @@ static void guc_client_free(struct drm_device *dev,
* @ctx: the context that owns the client (we use the default render
* context)
*
- * Return: An i915_guc_client object if success.
+ * Return: An i915_guc_client object if success, error pointer on failure.
*/
static struct i915_guc_client *guc_client_alloc(struct drm_device *dev,
uint32_t priority,
@@ -727,10 +730,11 @@ static struct i915_guc_client *guc_client_alloc(struct
drm_device *dev,
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_guc *guc = &dev_priv->guc;
struct drm_i915_gem_object *obj;
+ int ret;
client = kzalloc(sizeof(*client), GFP_KERNEL);
if (!client)
- return NULL;
+ return ERR_PTR(-ENOMEM);
client->doorbell_id = GUC_INVALID_DOORBELL_ID;
client->priority = priority;
@@ -741,13 +745,16 @@ static struct i915_guc_client *guc_client_alloc(struct
drm_device *dev,
GUC_MAX_GPU_CONTEXTS, GFP_KERNEL);
if (client->ctx_index >= GUC_MAX_GPU_CONTEXTS) {
client->ctx_index = GUC_INVALID_CTX_ID;
+ ret = -EINVAL;
goto err;
}
/* The first page is doorbell/proc_desc. Two followed pages are wq. */
obj = gem_allocate_guc_obj(dev, GUC_DB_SIZE + GUC_WQ_SIZE);
- if (!obj)
+ if (IS_ERR(obj)) {
+ ret = PTR_ERR(obj);
goto err;
+ }
client->client_obj = obj;
client->wq_offset = GUC_DB_SIZE;
@@ -766,9 +773,11 @@ static struct i915_guc_client *guc_client_alloc(struct
drm_device *dev,
client->proc_desc_offset = (GUC_DB_SIZE / 2);
client->doorbell_id = assign_doorbell(guc, client->priority);
- if (client->doorbell_id == GUC_INVALID_DOORBELL_ID)
+ if (client->doorbell_id == GUC_INVALID_DOORBELL_ID) {
/* XXX: evict a doorbell instead */
+ ret = -EINVAL;
goto err;
+ }
guc_init_proc_desc(guc, client);
guc_init_ctx_desc(guc, client);
@@ -776,7 +785,8 @@ static struct i915_guc_client *guc_client_alloc(struct
drm_device *dev,
/* XXX: Any cache flushes needed? General domain mgmt calls? */
- if (host2guc_allocate_doorbell(guc, client))
+ ret = host2guc_allocate_doorbell(guc, client);
+ if (ret)
goto err;
DRM_DEBUG_DRIVER("new priority %u client %p: ctx_index %u db_id %u\n",
@@ -788,7 +798,7 @@ err:
DRM_ERROR("FAILED to create priority %u GuC client!\n", priority);
guc_client_free(dev, client);
- return NULL;
+ return ERR_PTR(ret);
}
static void guc_create_log(struct intel_guc *guc)
@@ -813,7 +823,7 @@ static void guc_create_log(struct intel_guc *guc)
obj = guc->log_obj;
if (!obj) {
obj = gem_allocate_guc_obj(dev_priv->dev, size);
- if (!obj) {
+ if (IS_ERR(obj)) {
/* logging will be off */
i915.guc_log_level = -1;
return;
@@ -843,6 +853,7 @@ int i915_guc_submission_init(struct drm_device *dev)
const size_t poolsize = GUC_MAX_GPU_CONTEXTS * ctxsize;
const size_t gemsize = round_up(poolsize, PAGE_SIZE);
struct intel_guc *guc = &dev_priv->guc;
+ int ret;
if (!i915.enable_guc_submission)
return 0; /* not enabled */
@@ -851,8 +862,11 @@ int i915_guc_submission_init(struct drm_device *dev)
return 0; /* already allocated */
guc->ctx_pool_obj = gem_allocate_guc_obj(dev_priv->dev, gemsize);
- if (!guc->ctx_pool_obj)
- return -ENOMEM;
+ if (IS_ERR(guc->ctx_pool_obj)) {
+ ret = PTR_ERR(guc->ctx_pool_obj);
+ guc->ctx_pool_obj = NULL;
+ return ret;
+ }
ida_init(&guc->ctx_ids);
@@ -870,9 +884,9 @@ int i915_guc_submission_enable(struct drm_device *dev)
/* client for execbuf submission */
client = guc_client_alloc(dev, GUC_CTX_PRIORITY_KMD_NORMAL, ctx);
- if (!client) {
+ if (IS_ERR(client)) {
DRM_ERROR("Failed to create execbuf guc_client\n");
- return -ENOMEM;
+ return PTR_ERR(client);
}
guc->execbuf_client = client;
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index dd0e966..006d43a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2543,7 +2543,7 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
base_aligned,
base_aligned,
size_aligned);
- if (!obj)
+ if (IS_ERR(obj))
return false;
obj->tiling_mode = plane_config->tiling;
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c
b/drivers/gpu/drm/i915/intel_fbdev.c
index 7ccde58..b2f134a 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -148,11 +148,11 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
* features. */
if (size * 2 < dev_priv->gtt.stolen_usable_size)
obj = i915_gem_object_create_stolen(dev, size);
- if (obj == NULL)
+ if (IS_ERR_OR_NULL(obj))
obj = i915_gem_alloc_object(dev, size);
- if (!obj) {
+ if (IS_ERR(obj)) {
DRM_ERROR("failed to allocate framebuffer\n");
- ret = -ENOMEM;
+ ret = PTR_ERR(obj);
goto out;
}
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 4ebafab..5ca4c06 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1371,9 +1371,11 @@ static int lrc_setup_wa_ctx_obj(struct intel_engine_cs
*ring, u32 size)
int ret;
ring->wa_ctx.obj = i915_gem_alloc_object(ring->dev, PAGE_ALIGN(size));
- if (!ring->wa_ctx.obj) {
+ if (IS_ERR(ring->wa_ctx.obj)) {
DRM_DEBUG_DRIVER("alloc LRC WA ctx backing obj failed.\n");
- return -ENOMEM;
+ ret = PTR_ERR(ring->wa_ctx.obj);
+ ring->wa_ctx.obj = NULL;
+ return ret;
}
ret = i915_gem_obj_ggtt_pin(ring->wa_ctx.obj, PAGE_SIZE, 0);
@@ -2456,9 +2458,9 @@ int intel_lr_context_deferred_alloc(struct intel_context
*ctx,
context_size += PAGE_SIZE * LRC_PPHWSP_PN;
ctx_obj = i915_gem_alloc_object(dev, context_size);
- if (!ctx_obj) {
+ if (IS_ERR(ctx_obj)) {
DRM_DEBUG_DRIVER("Alloc LRC backing obj failed.\n");
- return -ENOMEM;
+ return PTR_ERR(ctx_obj);
}
ringbuf = intel_engine_create_ringbuffer(ring, 4 * PAGE_SIZE);
diff --git a/drivers/gpu/drm/i915/intel_overlay.c
b/drivers/gpu/drm/i915/intel_overlay.c
index 76f1980..3a65858 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -1392,9 +1392,9 @@ void intel_setup_overlay(struct drm_device *dev)
reg_bo = NULL;
if (!OVERLAY_NEEDS_PHYSICAL(dev))
reg_bo = i915_gem_object_create_stolen(dev, PAGE_SIZE);
- if (reg_bo == NULL)
+ if (IS_ERR_OR_NULL(reg_bo))
reg_bo = i915_gem_alloc_object(dev, PAGE_SIZE);
- if (reg_bo == NULL)
+ if (IS_ERR(reg_bo))
goto out_free;
overlay->reg_bo = reg_bo;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9968c66..0afb819 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5174,10 +5174,11 @@ static void valleyview_setup_pctx(struct drm_device
*dev)
pcbr_offset,
I915_GTT_OFFSET_NONE,
pctx_size);
- goto out;
+ if (!IS_ERR(pctx))
+ goto out;
