[PATCH v2 6/7] drm/i915/lmem: Bypass aperture when lmem is available
Matthew Auld
matthew.auld at intel.com
Tue Apr 27 08:54:16 UTC 2021
From: Anusha Srivatsa <anusha.srivatsa at intel.com>
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 at linux.intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Cc: Chris P Wilson <chris.p.wilson at intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: CQ Tang <cq.tang at intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/display/intel_fbdev.c | 22 +++++++++++++------
drivers/gpu/drm/i915/gem/i915_gem_lmem.c | 15 +++++++++++++
drivers/gpu/drm/i915/gem/i915_gem_lmem.h | 5 +++++
drivers/gpu/drm/i915/i915_vma.c | 25 ++++++++++++++++------
4 files changed, 54 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 2b37959da747..4af40229f5ec 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -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);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
index 017db8f71130..f44bdd08f7cb 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
@@ -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;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
index 036d53c01de9..fac6bc5a5ebb 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
@@ -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 *
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index eb01899ac6b7..468317e3b477 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -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;
--
2.26.3
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