From: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
LMEM can be accessed by the CPU through a BAR. The mapping itself should
be 1:1.
Signed-off-by: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_region_lmem.c | 16 ++++++++++++++++
drivers/gpu/drm/i915/intel_region_lmem.h | 3 +++
2 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_region_lmem.c b/drivers/gpu/drm/i915/intel_region_lmem.c
index d0a5311cf235..ceec2bff465f 100644
--- a/drivers/gpu/drm/i915/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/intel_region_lmem.c
@@ -248,6 +248,22 @@ void __iomem *i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
return io_mapping_map_wc(&obj->memory_region->iomap, offset, size);
}
+resource_size_t i915_gem_object_lmem_io_offset(struct drm_i915_gem_object *obj,
+ unsigned long n)
+{
+ struct intel_memory_region *mem = obj->memory_region;
+ dma_addr_t daddr;
+
+ /*
+ * XXX: It's not a dma address, more a device address or physical
+ * offset, so we are clearly abusing the semantics of the sg_table
+ * here, and elsewhere like in the gtt paths.
+ */
+ daddr = i915_gem_object_get_dma_address(obj, n);
+
+ return mem->io_start + daddr;
+}
+
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
{
struct intel_memory_region *region = obj->memory_region;
diff --git a/drivers/gpu/drm/i915/intel_region_lmem.h b/drivers/gpu/drm/i915/intel_region_lmem.h
index 20084f7b4bff..609de692489d 100644
--- a/drivers/gpu/drm/i915/intel_region_lmem.h
+++ b/drivers/gpu/drm/i915/intel_region_lmem.h
@@ -12,6 +12,9 @@ void __iomem *i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
void __iomem *i915_gem_object_lmem_io_map_page(struct drm_i915_gem_object *obj,
unsigned long n);
+resource_size_t i915_gem_object_lmem_io_offset(struct drm_i915_gem_object *obj,
+ unsigned long n);
+
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj);
struct drm_i915_gem_object *
--
2.20.1
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