[PATCH v3] drm/amdgpu: Add EXT_COHERENCE memory allocation flags
David Francis
David.Francis at amd.com
Wed Jul 26 13:34:02 UTC 2023
These flags (for GEM and SVM allocations) allocate
memory that allows for system-scope atomic semantics.
On GFX943 these flags cause caches to be avoided on
non-local memory.
On all other ASICs they are identical in functionality to the
equivalent COHERENT flags.
Corresponding Thunk patch is at
https://github.com/RadeonOpenCompute/ROCT-Thunk-Interface/pull/88
Signed-off-by: David Francis <David.Francis at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 2 ++
drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c | 1 +
drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c | 1 +
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 5 ++++-
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 10 +++++++++-
include/uapi/drm/amdgpu_drm.h | 7 +++++++
include/uapi/linux/kfd_ioctl.h | 3 +++
7 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index d34c3ef8f3ed..7f23bc0ee592 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -1738,6 +1738,8 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
if (flags & KFD_IOC_ALLOC_MEM_FLAGS_COHERENT)
alloc_flags |= AMDGPU_GEM_CREATE_COHERENT;
+ if (flags & KFD_IOC_ALLOC_MEM_FLAGS_EXT_COHERENCE)
+ alloc_flags |= AMDGPU_GEM_CREATE_EXT_COHERENCE;
if (flags & KFD_IOC_ALLOC_MEM_FLAGS_UNCACHED)
alloc_flags |= AMDGPU_GEM_CREATE_UNCACHED;
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
index 6b430e10d38e..8e951688668b 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c
@@ -632,6 +632,7 @@ static void gmc_v10_0_get_vm_pte(struct amdgpu_device *adev,
}
if (bo && bo->flags & (AMDGPU_GEM_CREATE_COHERENT |
+ AMDGPU_GEM_CREATE_EXT_COHERENCE |
AMDGPU_GEM_CREATE_UNCACHED))
*flags = (*flags & ~AMDGPU_PTE_MTYPE_NV10_MASK) |
AMDGPU_PTE_MTYPE_NV10(MTYPE_UC);
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
index a6ee0220db56..ff330c7c0232 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c
@@ -540,6 +540,7 @@ static void gmc_v11_0_get_vm_pte(struct amdgpu_device *adev,
}
if (bo && bo->flags & (AMDGPU_GEM_CREATE_COHERENT |
+ AMDGPU_GEM_CREATE_EXT_COHERENCE |
AMDGPU_GEM_CREATE_UNCACHED))
*flags = (*flags & ~AMDGPU_PTE_MTYPE_NV10_MASK) |
AMDGPU_PTE_MTYPE_NV10(MTYPE_UC);
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 880460cd3239..e40fcfc1a3f3 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1183,7 +1183,8 @@ static void gmc_v9_0_get_coherence_flags(struct amdgpu_device *adev,
{
struct amdgpu_device *bo_adev = amdgpu_ttm_adev(bo->tbo.bdev);
bool is_vram = bo->tbo.resource->mem_type == TTM_PL_VRAM;
- bool coherent = bo->flags & AMDGPU_GEM_CREATE_COHERENT;
+ bool coherent = bo->flags & (AMDGPU_GEM_CREATE_COHERENT | AMDGPU_GEM_CREATE_EXT_COHERENCE);
+ bool ext_coherence = bo->flags & AMDGPU_GEM_CREATE_EXT_COHERENCE;
bool uncached = bo->flags & AMDGPU_GEM_CREATE_UNCACHED;
struct amdgpu_vm *vm = mapping->bo_va->base.vm;
unsigned int mtype_local, mtype;
@@ -1251,6 +1252,8 @@ static void gmc_v9_0_get_coherence_flags(struct amdgpu_device *adev,
snoop = true;
if (uncached) {
mtype = MTYPE_UC;
+ } else if (ext_coherence) {
+ mtype = is_local ? MTYPE_CC : MTYPE_UC;
} else if (adev->flags & AMD_IS_APU) {
mtype = is_local ? mtype_local : MTYPE_NC;
} else {
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index 1b50eae051a4..28304b93a990 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1155,7 +1155,8 @@ svm_range_get_pte_flags(struct kfd_node *node,
uint32_t mapping_flags = 0;
uint64_t pte_flags;
bool snoop = (domain != SVM_RANGE_VRAM_DOMAIN);
- bool coherent = flags & KFD_IOCTL_SVM_FLAG_COHERENT;
+ bool coherent = flags & (KFD_IOCTL_SVM_FLAG_COHERENT | KFD_IOCTL_SVM_FLAG_EXT_COHERENCE);
+ bool ext_coherence = flags & KFD_IOCTL_SVM_FLAG_EXT_COHERENCE;
bool uncached = false; /*flags & KFD_IOCTL_SVM_FLAG_UNCACHED;*/
unsigned int mtype_local;
@@ -1203,6 +1204,13 @@ svm_range_get_pte_flags(struct kfd_node *node,
snoop = true;
if (uncached) {
mapping_flags |= AMDGPU_VM_MTYPE_UC;
+ } else if (ext_coherence) {
+ /* local HBM region close to partition */
+ if (bo_node->adev == node->adev &&
+ (!bo_node->xcp || !node->xcp || bo_node->xcp->mem_id == node->xcp->mem_id))
+ mapping_flags |= AMDGPU_VM_MTYPE_CC;
+ else
+ mapping_flags |= AMDGPU_VM_MTYPE_UC;
} else if (domain == SVM_RANGE_VRAM_DOMAIN) {
/* local HBM region close to partition */
if (bo_node->adev == node->adev &&
diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 79b14828d542..d67102dc214a 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -158,6 +158,13 @@ extern "C" {
* may override the MTYPE selected in AMDGPU_VA_OP_MAP.
*/
#define AMDGPU_GEM_CREATE_UNCACHED (1 << 14)
+/* Flag that BO should be coherent across devices when using device-level
+ * atomics. May depend on GPU instructions to flush caches explicitly.
+ *
+ * This influences the choice of MTYPE in the PTEs on GFXv9 and later GPUs and
+ * may override the MTYPE selected in AMDGPU_VA_OP_MAP.
+ */
+#define AMDGPU_GEM_CREATE_EXT_COHERENCE (1 << 15)
struct drm_amdgpu_gem_create_in {
/** the requested memory size */
diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
index eeb2fdcbdcb7..dd8f0dba7631 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -405,6 +405,7 @@ struct kfd_ioctl_acquire_vm_args {
#define KFD_IOC_ALLOC_MEM_FLAGS_AQL_QUEUE_MEM (1 << 27)
#define KFD_IOC_ALLOC_MEM_FLAGS_COHERENT (1 << 26)
#define KFD_IOC_ALLOC_MEM_FLAGS_UNCACHED (1 << 25)
+#define KFD_IOC_ALLOC_MEM_FLAGS_EXT_COHERENCE (1 << 24)
/* Allocate memory for later SVM (shared virtual memory) mapping.
*
@@ -659,6 +660,8 @@ enum kfd_mmio_remap {
#define KFD_IOCTL_SVM_FLAG_GPU_READ_MOSTLY 0x00000020
/* Keep GPU memory mapping always valid as if XNACK is disable */
#define KFD_IOCTL_SVM_FLAG_GPU_ALWAYS_MAPPED 0x00000040
+/* Fine grained coherency between all devices using device-scope atomics */
+#define KFD_IOCTL_SVM_FLAG_EXT_COHERENCE 0x00000080
/**
* kfd_ioctl_svm_op - SVM ioctl operations
--
2.34.1
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