From: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
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)
v7: Resolved rebasing conflicts (Ankit)
v8: Removed redundant code (Chris)
v9: Rebase
v10: Rebase, resolve merge conflicts
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 15 ++++----
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 | 50 ++++++++++++++++----------
drivers/gpu/drm/i915/intel_display.c | 2 +-
drivers/gpu/drm/i915/intel_fbdev.c | 2 +-
drivers/gpu/drm/i915/intel_overlay.c | 3 +-
drivers/gpu/drm/i915/intel_pm.c | 7 ++--
drivers/gpu/drm/i915/intel_ringbuffer.c | 4 +--
9 files changed, 83 insertions(+), 60 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0224969..4d7a135 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -392,19 +392,18 @@ i915_gem_alloc_object_stolen(struct drm_device *dev, size_t size)
mutex_lock(&dev->struct_mutex);
obj = i915_gem_object_create_stolen(dev, size);
- if (!obj) {
- mutex_unlock(&dev->struct_mutex);
- return NULL;
- }
+ if (IS_ERR(obj))
+ goto out;
/* Always clear fresh buffers before handing to userspace */
ret = i915_gem_object_clear(obj);
if (ret) {
drm_gem_object_unreference(&obj->base);
- mutex_unlock(&dev->struct_mutex);
- return NULL;
+ obj = ERR_PTR(ret);
+ goto out;
}
+out:
mutex_unlock(&dev->struct_mutex);
return obj;
}
@@ -439,8 +438,8 @@ i915_gem_create(struct drm_file *file,
return -EINVAL;
}
- if (IS_ERR_OR_NULL(obj))
- 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 */
diff --git a/drivers/gpu/drm/i915/i915_gem_render_state.c b/drivers/gpu/drm/i915/i915_gem_render_state.c
index 7c93327..84d91c9 100644
--- a/drivers/gpu/drm/i915/i915_gem_render_state.c
+++ b/drivers/gpu/drm/i915/i915_gem_render_state.c
@@ -59,8 +59,11 @@ static int render_state_init(struct render_state *so,
return -EINVAL;
so->obj = i915_gem_object_create(dev_priv->dev, 4096);
- if (IS_ERR(so->obj))
- return PTR_ERR(so->obj);
+ 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 81d5b6b..dcb70c1 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -503,6 +503,7 @@ i915_pages_create_for_stolen(struct drm_device *dev,
struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct sg_table *st;
struct scatterlist *sg;
+ int ret;
DRM_DEBUG_DRIVER("offset=0x%x, size=%d\n", offset, size);
BUG_ON(offset > ggtt->stolen_size - size);
@@ -514,11 +515,12 @@ 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;
@@ -567,18 +569,23 @@ _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;
@@ -590,10 +597,6 @@ _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 *
@@ -605,29 +608,29 @@ 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 *
@@ -644,7 +647,7 @@ 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);
lockdep_assert_held(&dev->struct_mutex);
@@ -654,11 +657,11 @@ 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;
@@ -668,15 +671,15 @@ 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 */
@@ -715,5 +718,5 @@ 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 ac72451..6ae4f49 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -598,27 +598,30 @@ int i915_guc_submit(struct drm_i915_gem_request *rq)
* 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_object_create(dev, size);
if (IS_ERR(obj))
- return NULL;
+ 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. */
@@ -693,7 +696,7 @@ 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, else NULL.
+ * 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,
@@ -703,10 +706,11 @@ 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;
@@ -717,13 +721,16 @@ 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;
+ }
/* We'll keep just the first (doorbell/proc) page permanently kmap'd. */
client->client_obj = obj;
@@ -744,9 +751,11 @@ 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);
@@ -754,7 +763,8 @@ 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",
@@ -766,7 +776,7 @@ 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)
@@ -791,7 +801,7 @@ 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;
@@ -911,6 +921,7 @@ 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 */
@@ -919,8 +930,11 @@ 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);
@@ -941,9 +955,9 @@ int i915_guc_submission_enable(struct drm_device *dev)
client = guc_client_alloc(dev,
GUC_CTX_PRIORITY_KMD_NORMAL,
dev_priv->kernel_context);
- 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 1c700a2..4bbda9c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2495,7 +2495,7 @@ intel_alloc_initial_plane_obj(struct intel_crtc *crtc,
base_aligned,
base_aligned,
size_aligned);
- if (!obj) {
+ if (IS_ERR(obj)) {
mutex_unlock(&dev->struct_mutex);
return false;
}
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
index 99e2753..e094005 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -149,7 +149,7 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
* features. */
if (size * 2 < ggtt->stolen_usable_size)
obj = i915_gem_object_create_stolen(dev, size);
- if (obj == NULL)
+ if (IS_ERR_OR_NULL(obj))
obj = i915_gem_object_create(dev, size);
if (IS_ERR(obj)) {
DRM_ERROR("failed to allocate framebuffer\n");
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index eb93f90..3323596 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -1388,10 +1388,11 @@ void intel_setup_overlay(struct drm_i915_private *dev_priv)
reg_bo = NULL;
if (!OVERLAY_NEEDS_PHYSICAL(dev_priv))
reg_bo = i915_gem_object_create_stolen(dev_priv->dev, PAGE_SIZE);
- if (reg_bo == NULL)
+ if (IS_ERR_OR_NULL(reg_bo))
reg_bo = i915_gem_object_create(dev_priv->dev, PAGE_SIZE);
if (IS_ERR(reg_bo))
goto out_free;
+
overlay->reg_bo = reg_bo;
if (OVERLAY_NEEDS_PHYSICAL(dev_priv)) {
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index b6dfd02..eea2804 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5517,10 +5517,13 @@ static void valleyview_setup_pctx(struct drm_i915_private *dev_priv)
pcbr_offset,
I915_GTT_OFFSET_NONE,
pctx_size);
+ if (IS_ERR(pctx))
+ pctx = NULL;
+
goto out;
}
- DRM_DEBUG_DRIVER("BIOS didn't set up PCBR, fixing up\n");
+ DRM_DEBUG_DRIVER("BIOS didn't set up PCBR or prealloc failed, fixing up\n");
/*
* From the Gunit register HAS:
@@ -5531,7 +5534,7 @@ static void valleyview_setup_pctx(struct drm_i915_private *dev_priv)
* memory, or any other relevant ranges.
*/
pctx = i915_gem_object_create_stolen(dev_priv->dev, pctx_size);
- if (!pctx) {
+ if (IS_ERR(pctx)) {
DRM_DEBUG("not enough stolen space for PCTX, disabling\n");
goto out;
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 8d35a39..586360b 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2179,7 +2179,7 @@ static int intel_alloc_ringbuffer_obj(struct drm_device *dev,
obj = NULL;
if (!HAS_LLC(dev))
obj = i915_gem_object_create_stolen(dev, ringbuf->size);
- if (obj == NULL)
+ if (IS_ERR_OR_NULL(obj))
obj = i915_gem_object_create(dev, ringbuf->size);
if (IS_ERR(obj))
return PTR_ERR(obj);
@@ -2740,7 +2740,7 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
engine->hw_id = 0;
engine->mmio_base = RENDER_RING_BASE;
- if (INTEL_GEN(dev_priv) >= 8) {
+ if (INTEL_INFO(dev)->gen >= 8) {
if (i915_semaphore_is_enabled(dev_priv)) {
obj = i915_gem_object_create(dev, 4096);
if (IS_ERR(obj)) {
--
1.9.1
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