[PATCH 2/7] drm/i915/gem: Refactor placement setup for i915_gem_object_create* (v2)
Jason Ekstrand
jason at jlekstrand.net
Fri Jul 16 14:14:21 UTC 2021
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()
Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>
Cc: Matthew Auld <matthew.auld at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_create.c | 81 ++++++++++++----------
1 file changed, 45 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..5766749a449c0 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 +305,13 @@ 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);
+ for (i = 0; i < args->num_regions; i++)
+ ext_data->placements[i] = placements[i];
return 0;
@@ -308,11 +319,11 @@ 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 +333,6 @@ 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 +367,6 @@ 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 +379,22 @@ 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 +404,7 @@ 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;
}
--
2.31.1
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