[d-kernel] [PATCH] amdkfd: partially revert 96c211f1f9ef82183493f4ceed4e347b52849149

[lakostis@altlinux.org]

From: "Konstantin A. Lepikhov" <lakostis@altlinux.ru>

This fixes the issue with hanging/crashing blender/opencl applications
See https://github.com/ROCm/ROCm/issues/2596#issuecomment-1874371163
(Can be applied to v6.6.9 kernel)
---
 drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c | 26 ++++++++++----------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c b/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
index 62b205dac63a..efb05acea2f8 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
@@ -330,12 +330,6 @@ static void kfd_init_apertures_vi(struct kfd_process_device *pdd, uint8_t id)
 	pdd->gpuvm_limit =
 		pdd->dev->kfd->shared_resources.gpuvm_size - 1;
 
-	/* dGPUs: the reserved space for kernel
-	 * before SVM
-	 */
-	pdd->qpd.cwsr_base = SVM_CWSR_BASE;
-	pdd->qpd.ib_base = SVM_IB_BASE;
-
 	pdd->scratch_base = MAKE_SCRATCH_APP_BASE_VI();
 	pdd->scratch_limit = MAKE_SCRATCH_APP_LIMIT(pdd->scratch_base);
 }
@@ -345,18 +339,18 @@ static void kfd_init_apertures_v9(struct kfd_process_device *pdd, uint8_t id)
 	pdd->lds_base = MAKE_LDS_APP_BASE_V9();
 	pdd->lds_limit = MAKE_LDS_APP_LIMIT(pdd->lds_base);
 
-	pdd->gpuvm_base = PAGE_SIZE;
+	/* Raven needs SVM to support graphic handle, etc. Leave the small
+	 * reserved space before SVM on Raven as well, even though we don't
+	 * have to.
+	 * Set gpuvm_base and gpuvm_limit to CANONICAL addresses so that they
+	 * are used in Thunk to reserve SVM.
+	 */
+	pdd->gpuvm_base = SVM_USER_BASE;
 	pdd->gpuvm_limit =
 		pdd->dev->kfd->shared_resources.gpuvm_size - 1;
 
 	pdd->scratch_base = MAKE_SCRATCH_APP_BASE_V9();
 	pdd->scratch_limit = MAKE_SCRATCH_APP_LIMIT(pdd->scratch_base);
-
-	/*
-	 * Place TBA/TMA on opposite side of VM hole to prevent
-	 * stray faults from triggering SVM on these pages.
-	 */
-	pdd->qpd.cwsr_base = pdd->dev->kfd->shared_resources.gpuvm_size;
 }
 
 int kfd_init_apertures(struct kfd_process *process)
@@ -413,6 +407,12 @@ int kfd_init_apertures(struct kfd_process *process)
 					return -EINVAL;
 				}
 			}
+
+			/* dGPUs: the reserved space for kernel
+			 * before SVM
+			 */
+			pdd->qpd.cwsr_base = SVM_CWSR_BASE;
+			pdd->qpd.ib_base = SVM_IB_BASE;
 		}
 
 		dev_dbg(kfd_device, "node id %u\n", id);
-- 
2.42.1