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Code Issues Releases Wiki Activity

drm/i915/lmem: Bypass aperture when lmem is available

Browse source 
In the scenario where local memory is available, we have
rely on CPU access via lmem directly instead of aperture.

v2:
gmch is only relevant for much older hw, therefore we can drop the
has_aperture check since it should always be present on such platforms.
(Chris)

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Chris P Wilson <chris.p.wilson@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: CQ Tang <cq.tang@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210427085417.120246-6-matthew.auld@intel.com
This commit is contained in:
Anusha Srivatsa 2021-04-27 09:54:16 +01:00 committed by Matthew Auld
parent a9cf6ab3e7
commit 4bc91dbde0
4 changed files with 54 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
drivers/gpu/drm/i915/display/intel_fbdev.c
View file

@ -139,14 +139,22 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
size = mode_cmd.pitches[0] * mode_cmd.height;
size = PAGE_ALIGN(size);
/* If the FB is too big, just don't use it since fbdev is not very
* important and we should probably use that space with FBC or other
* features. */
obj = ERR_PTR(-ENODEV);
if (size * 2 < dev_priv->stolen_usable_size)
obj = i915_gem_object_create_stolen(dev_priv, size);
if (IS_ERR(obj))
obj = i915_gem_object_create_shmem(dev_priv, size);
if (HAS_LMEM(dev_priv)) {
obj = i915_gem_object_create_lmem(dev_priv, size,
I915_BO_ALLOC_CONTIGUOUS);
} else {
/*
* If the FB is too big, just don't use it since fbdev is not very
* important and we should probably use that space with FBC or other
* features.
*/
if (size * 2 < dev_priv->stolen_usable_size)
obj = i915_gem_object_create_stolen(dev_priv, size);
if (IS_ERR(obj))
obj = i915_gem_object_create_shmem(dev_priv, size);
}
if (IS_ERR(obj)) {
drm_err(&dev_priv->drm, "failed to allocate framebuffer\n");
return PTR_ERR(obj);

15
drivers/gpu/drm/i915/gem/i915_gem_lmem.c
View file

@ -17,6 +17,21 @@ const struct drm_i915_gem_object_ops i915_gem_lmem_obj_ops = {
.release = i915_gem_object_release_memory_region,
};
void __iomem *
i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
unsigned long n,
unsigned long size)
{
resource_size_t offset;
GEM_BUG_ON(!i915_gem_object_is_contiguous(obj));
offset = i915_gem_object_get_dma_address(obj, n);
offset -= obj->mm.region->region.start;
return io_mapping_map_wc(&obj->mm.region->iomap, offset, size);
}
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *mr = obj->mm.region;

5
drivers/gpu/drm/i915/gem/i915_gem_lmem.h
View file

@ -14,6 +14,11 @@ struct intel_memory_region;
extern const struct drm_i915_gem_object_ops i915_gem_lmem_obj_ops;
void __iomem *
i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
unsigned long n,
unsigned long size);
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj);
struct drm_i915_gem_object *

25
drivers/gpu/drm/i915/i915_vma.c
View file

@ -27,6 +27,7 @@
#include "display/intel_frontbuffer.h"
#include "gem/i915_gem_lmem.h"
#include "gt/intel_engine.h"
#include "gt/intel_engine_heartbeat.h"
#include "gt/intel_gt.h"
@ -448,9 +449,11 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
void __iomem *ptr;
int err;
if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
err = -ENODEV;
goto err;
if (!i915_gem_object_is_lmem(vma->obj)) {
if (GEM_WARN_ON(!i915_vma_is_map_and_fenceable(vma))) {
err = -ENODEV;
goto err;
}
}
GEM_BUG_ON(!i915_vma_is_ggtt(vma));
@ -458,9 +461,19 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
ptr = READ_ONCE(vma->iomap);
if (ptr == NULL) {
ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
vma->node.start,
vma->node.size);
/*
* TODO: consider just using i915_gem_object_pin_map() for lmem
* instead, which already supports mapping non-contiguous chunks
* of pages, that way we can also drop the
* I915_BO_ALLOC_CONTIGUOUS when allocating the object.
*/
if (i915_gem_object_is_lmem(vma->obj))
ptr = i915_gem_object_lmem_io_map(vma->obj, 0,
vma->obj->base.size);
else
ptr = io_mapping_map_wc(&i915_vm_to_ggtt(vma->vm)->iomap,
vma->node.start,
vma->node.size);
if (ptr == NULL) {
err = -ENOMEM;
goto err;