Helper to figure out the location of the AGP BAR.
v2: fix a couple of bugs
v3: correctly add one to vram_end
Signed-off-by: Christian König <christian.koenig at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c | 43 +++++++++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h | 5 +++
2 files changed, 48 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
index c6bcc4715373..86887c1496f8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.c
@@ -143,3 +143,46 @@ void amdgpu_gmc_gart_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
dev_info(adev->dev, "GART: %lluM 0x%016llX - 0x%016llX\n",
mc->gart_size >> 20, mc->gart_start, mc->gart_end);
}
+
+/**
+ * amdgpu_gmc_agp_location - try to find AGP location
+ * @adev: amdgpu device structure holding all necessary informations
+ * @mc: memory controller structure holding memory informations
+ *
+ * Function will place try to find a place for the AGP BAR in the MC address
+ * space.
+ *
+ * AGP BAR will be assigned the largest available hole in the address space.
+ * Should be called after VRAM and GART locations are setup.
+ */
+void amdgpu_gmc_agp_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc)
+{
+ const uint64_t sixteen_gb = 1ULL << 34;
+ const uint64_t sixteen_gb_mask = ~(sixteen_gb - 1);
+ u64 size_af, size_bf;
+
+ if (mc->vram_start > mc->gart_start) {
+ size_bf = (mc->vram_start & sixteen_gb_mask) -
+ ALIGN(mc->gart_end + 1, sixteen_gb);
+ size_af = mc->mc_mask + 1 - ALIGN(mc->vram_end + 1, sixteen_gb);
+ } else {
+ size_bf = mc->vram_start & sixteen_gb_mask;
+ size_af = (mc->gart_start & sixteen_gb_mask) -
+ ALIGN(mc->vram_end + 1, sixteen_gb);
+ }
+
+ if (size_bf > size_af) {
+ mc->agp_start = mc->vram_start > mc->gart_start ?
+ mc->gart_end + 1 : 0;
+ mc->agp_size = size_bf;
+ } else {
+ mc->agp_start = (mc->vram_start > mc->gart_start ?
+ mc->vram_end : mc->gart_end) + 1,
+ mc->agp_size = size_af;
+ }
+
+ mc->agp_start = ALIGN(mc->agp_start, sixteen_gb);
+ mc->agp_end = mc->agp_start + mc->agp_size - 1;
+ dev_info(adev->dev, "AGP: %lluM 0x%016llX - 0x%016llX\n",
+ mc->agp_size >> 20, mc->agp_start, mc->agp_end);
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
index 48715dd5808a..c9985e7dc9e5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gmc.h
@@ -94,6 +94,9 @@ struct amdgpu_gmc {
* about vram size near mc fb location */
u64 mc_vram_size;
u64 visible_vram_size;
+ u64 agp_size;
+ u64 agp_start;
+ u64 agp_end;
u64 gart_size;
u64 gart_start;
u64 gart_end;
@@ -164,5 +167,7 @@ void amdgpu_gmc_vram_location(struct amdgpu_device *adev, struct amdgpu_gmc *mc,
u64 base);
void amdgpu_gmc_gart_location(struct amdgpu_device *adev,
struct amdgpu_gmc *mc);
+void amdgpu_gmc_agp_location(struct amdgpu_device *adev,
+ struct amdgpu_gmc *mc);
#endif
--
2.17.1
