Revert "drm/amdgpu: use the kernel zone memory size as the max remote memory in amdgpu"

This reverts commit a693e050.

This breaks on systems with huge amounts of system memory as we do not have
enough vram to store the page tables.  Additionally, this is less of an issue
with the recent gtt manager changes.
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1679,8 +1679,6 @@ uint32_t amdgpu_ttm_tt_pte_flags(struct amdgpu_device *adev, struct ttm_tt *ttm,
 void amdgpu_vram_location(struct amdgpu_device *adev, struct amdgpu_mc *mc, u64 base);
 void amdgpu_gtt_location(struct amdgpu_device *adev, struct amdgpu_mc *mc);
 void amdgpu_ttm_set_active_vram_size(struct amdgpu_device *adev, u64 size);
-u64 amdgpu_ttm_get_gtt_mem_size(struct amdgpu_device *adev);
-int amdgpu_ttm_global_init(struct amdgpu_device *adev);
 int amdgpu_ttm_init(struct amdgpu_device *adev);
 void amdgpu_ttm_fini(struct amdgpu_device *adev);
 void amdgpu_program_register_sequence(struct amdgpu_device *adev,

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -34,7 +34,6 @@
 #include <ttm/ttm_placement.h>
 #include <ttm/ttm_module.h>
 #include <ttm/ttm_page_alloc.h>
-#include <ttm/ttm_memory.h>
 #include <drm/drmP.h>
 #include <drm/amdgpu_drm.h>
 #include <linux/seq_file.h>
@@ -65,7 +64,7 @@ static void amdgpu_ttm_mem_global_release(struct drm_global_reference *ref)
 	ttm_mem_global_release(ref->object);
 }
 
-int amdgpu_ttm_global_init(struct amdgpu_device *adev)
+static int amdgpu_ttm_global_init(struct amdgpu_device *adev)
 {
 	struct drm_global_reference *global_ref;
 	struct amdgpu_ring *ring;
@@ -1151,6 +1150,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 	unsigned i, j;
 	int r;
 
+	r = amdgpu_ttm_global_init(adev);
+	if (r) {
+		return r;
+	}
 	/* No others user of address space so set it to 0 */
 	r = ttm_bo_device_init(&adev->mman.bdev,
 			       adev->mman.bo_global_ref.ref.object,
@@ -1650,8 +1653,3 @@ static void amdgpu_ttm_debugfs_fini(struct amdgpu_device *adev)
 
 #endif
 }
-
-u64 amdgpu_ttm_get_gtt_mem_size(struct amdgpu_device *adev)
-{
-	return ttm_get_kernel_zone_memory_size(adev->mman.mem_global_ref.object);
-}

drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c

@@ -335,7 +335,7 @@ static int gmc_v6_0_mc_init(struct amdgpu_device *adev)
 	 * size equal to the 1024 or vram, whichever is larger.
 	 */
 	if (amdgpu_gart_size == -1)
-		adev->mc.gtt_size = amdgpu_ttm_get_gtt_mem_size(adev);
+		adev->mc.gtt_size = max((1024ULL << 20), adev->mc.mc_vram_size);
 	else
 		adev->mc.gtt_size = (uint64_t)amdgpu_gart_size << 20;
 
@@ -795,11 +795,6 @@ static int gmc_v6_0_sw_init(void *handle)
 		return r;
 	}
 
-	r = amdgpu_ttm_global_init(adev);
-	if (r) {
-		return r;
-	}
-
 	r = gmc_v6_0_mc_init(adev);
 	if (r)
 		return r;

drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c

@@ -385,7 +385,7 @@ static int gmc_v7_0_mc_init(struct amdgpu_device *adev)
 	 * size equal to the 1024 or vram, whichever is larger.
 	 */
 	if (amdgpu_gart_size == -1)
-		adev->mc.gtt_size = amdgpu_ttm_get_gtt_mem_size(adev);
+		adev->mc.gtt_size = max((1024ULL << 20), adev->mc.mc_vram_size);
 	else
 		adev->mc.gtt_size = (uint64_t)amdgpu_gart_size << 20;
 
@@ -945,11 +945,6 @@ static int gmc_v7_0_sw_init(void *handle)
 		return r;
 	}
 
-	r = amdgpu_ttm_global_init(adev);
-	if (r) {
-		return r;
-	}
-
 	r = gmc_v7_0_mc_init(adev);
 	if (r)
 		return r;

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -472,7 +472,7 @@ static int gmc_v8_0_mc_init(struct amdgpu_device *adev)
 	 * size equal to the 1024 or vram, whichever is larger.
 	 */
 	if (amdgpu_gart_size == -1)
-		adev->mc.gtt_size = amdgpu_ttm_get_gtt_mem_size(adev);
+		adev->mc.gtt_size = max((1024ULL << 20), adev->mc.mc_vram_size);
 	else
 		adev->mc.gtt_size = (uint64_t)amdgpu_gart_size << 20;
 
@@ -952,11 +952,6 @@ static int gmc_v8_0_sw_init(void *handle)
 		return r;
 	}
 
-	r = amdgpu_ttm_global_init(adev);
-	if (r) {
-		return r;
-	}
-
 	r = gmc_v8_0_mc_init(adev);
 	if (r)
 		return r;