Since we don't allow changing the set of regions after creation, we can make ext_set_placements() build up the region set directly in the create_ext and assign it to the object later. This is similar to what we did for contexts with the proto-context only simpler because there's no funny object shuffling. This will be used in the next patch to allow us to de-duplicate a bunch of code. Also, since we know the maximum number of regions up-front, we can use a fixed-size temporary array for the regions. This simplifies memory management a bit for this new delayed approach.
v2 (Matthew Auld): - Get rid of MAX_N_PLACEMENTS - Drop kfree(placements) from set_placements() v3 (Matthew Auld): - Properly set ext_data->n_placements
Signed-off-by: Jason Ekstrand jason@jlekstrand.net Reviewed-by: Matthew Auld matthew.auld@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_create.c | 82 ++++++++++++---------- 1 file changed, 46 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c index 51f92e4b1a69d..aa687b10dcd45 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_create.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c @@ -27,10 +27,13 @@ static u32 object_max_page_size(struct drm_i915_gem_object *obj) return max_page_size; }
-static void object_set_placements(struct drm_i915_gem_object *obj, - struct intel_memory_region **placements, - unsigned int n_placements) +static int object_set_placements(struct drm_i915_gem_object *obj, + struct intel_memory_region **placements, + unsigned int n_placements) { + struct intel_memory_region **arr; + unsigned int i; + GEM_BUG_ON(!n_placements);
/* @@ -44,9 +47,20 @@ static void object_set_placements(struct drm_i915_gem_object *obj, obj->mm.placements = &i915->mm.regions[mr->id]; obj->mm.n_placements = 1; } else { - obj->mm.placements = placements; + arr = kmalloc_array(n_placements, + sizeof(struct intel_memory_region *), + GFP_KERNEL); + if (!arr) + return -ENOMEM; + + for (i = 0; i < n_placements; i++) + arr[i] = placements[i]; + + obj->mm.placements = arr; obj->mm.n_placements = n_placements; } + + return 0; }
static int i915_gem_publish(struct drm_i915_gem_object *obj, @@ -148,7 +162,9 @@ i915_gem_dumb_create(struct drm_file *file, return -ENOMEM;
mr = intel_memory_region_by_type(to_i915(dev), mem_type); - object_set_placements(obj, &mr, 1); + ret = object_set_placements(obj, &mr, 1); + if (ret) + goto object_free;
ret = i915_gem_setup(obj, args->size); if (ret) @@ -184,7 +200,9 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data, return -ENOMEM;
mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); - object_set_placements(obj, &mr, 1); + ret = object_set_placements(obj, &mr, 1); + if (ret) + goto object_free;
ret = i915_gem_setup(obj, args->size); if (ret) @@ -199,7 +217,8 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
struct create_ext { struct drm_i915_private *i915; - struct drm_i915_gem_object *vanilla_object; + struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; + unsigned int n_placements; };
static void repr_placements(char *buf, size_t size, @@ -230,8 +249,7 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, struct drm_i915_private *i915 = ext_data->i915; struct drm_i915_gem_memory_class_instance __user *uregions = u64_to_user_ptr(args->regions); - struct drm_i915_gem_object *obj = ext_data->vanilla_object; - struct intel_memory_region **placements; + struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; u32 mask; int i, ret = 0;
@@ -245,6 +263,8 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, ret = -EINVAL; }
+ BUILD_BUG_ON(ARRAY_SIZE(i915->mm.regions) != ARRAY_SIZE(placements)); + BUILD_BUG_ON(ARRAY_SIZE(ext_data->placements) != ARRAY_SIZE(placements)); if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) { drm_dbg(&i915->drm, "num_regions is too large\n"); ret = -EINVAL; @@ -253,21 +273,13 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, if (ret) return ret;
- placements = kmalloc_array(args->num_regions, - sizeof(struct intel_memory_region *), - GFP_KERNEL); - if (!placements) - return -ENOMEM; - mask = 0; for (i = 0; i < args->num_regions; i++) { struct drm_i915_gem_memory_class_instance region; struct intel_memory_region *mr;
- if (copy_from_user(®ion, uregions, sizeof(region))) { - ret = -EFAULT; - goto out_free; - } + if (copy_from_user(®ion, uregions, sizeof(region))) + return -EFAULT;
mr = intel_memory_region_lookup(i915, region.memory_class, @@ -293,14 +305,14 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, ++uregions; }
- if (obj->mm.placements) { + if (ext_data->n_placements) { ret = -EINVAL; goto out_dump; }
- object_set_placements(obj, placements, args->num_regions); - if (args->num_regions == 1) - kfree(placements); + ext_data->n_placements = args->num_regions; + for (i = 0; i < args->num_regions; i++) + ext_data->placements[i] = placements[i];
return 0;
@@ -308,11 +320,11 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, if (1) { char buf[256];
- if (obj->mm.placements) { + if (ext_data->n_placements) { repr_placements(buf, sizeof(buf), - obj->mm.placements, - obj->mm.n_placements); + ext_data->placements, + ext_data->n_placements); drm_dbg(&i915->drm, "Placements were already set in previous EXT. Existing placements: %s\n", buf); @@ -322,8 +334,6 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args, drm_dbg(&i915->drm, "New placements(so far validated): %s\n", buf); }
-out_free: - kfree(placements); return ret; }
@@ -358,7 +368,6 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, struct drm_i915_private *i915 = to_i915(dev); struct drm_i915_gem_create_ext *args = data; struct create_ext ext_data = { .i915 = i915 }; - struct intel_memory_region **placements_ext; struct drm_i915_gem_object *obj; int ret;
@@ -371,21 +380,22 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, if (!obj) return -ENOMEM;
- ext_data.vanilla_object = obj; ret = i915_user_extensions(u64_to_user_ptr(args->extensions), create_extensions, ARRAY_SIZE(create_extensions), &ext_data); - placements_ext = obj->mm.placements; if (ret) goto object_free;
- if (!placements_ext) { - struct intel_memory_region *mr = + if (!ext_data.n_placements) { + ext_data.placements[0] = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM); - - object_set_placements(obj, &mr, 1); + ext_data.n_placements = 1; } + ret = object_set_placements(obj, ext_data.placements, + ext_data.n_placements); + if (ret) + goto object_free;
ret = i915_gem_setup(obj, args->size); if (ret) @@ -395,7 +405,7 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data,
object_free: if (obj->mm.n_placements > 1) - kfree(placements_ext); + kfree(obj->mm.placements); i915_gem_object_free(obj); return ret; }