The TBA and TMA, along with an unused IB allocation, reside at low
addresses in the VM address space. A stray VM fault which hits these
pages must be serviced by making their page table entries invalid.
The scheduler depends upon these pages being resident and fails,
preventing a debugger from inspecting the failure state.
By relocating these pages above 47 bits in the VM address space they
can only be reached when bits [63:48] are set to 1. This makes it much
less likely for a misbehaving program to generate accesses to them.
The current placement at VA (PAGE_SIZE*2) is readily hit by a NULL
access with a small offset.
v2:
- Move it to the reserved space to avoid concflicts with Mesa
- Add macros to make reserved space management easier
Cc: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@xxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Signed-off-by: Jay Cornwall <jay.cornwall@xxxxxxx>
Signed-off-by: Felix Kuehling <felix.kuehling@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c | 4 +--
drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c | 7 ++---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 12 ++++++--
drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c | 30
+++++++++++---------
4 files changed, 30 insertions(+), 23 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
index 823d31f4a2a3..53d0a458d78e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
@@ -28,9 +28,9 @@
uint64_t amdgpu_csa_vaddr(struct amdgpu_device *adev)
{
- uint64_t addr = adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT;
+ uint64_t addr = AMDGPU_VA_RESERVED_CSA_START(
+ adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT);
- addr -= AMDGPU_VA_RESERVED_CSA_SIZE;
addr = amdgpu_gmc_sign_extend(addr);
return addr;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c
index 3d0d56087d41..9e769ef50f2e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_seq64.c
@@ -45,11 +45,8 @@
*/
static inline u64 amdgpu_seq64_get_va_base(struct amdgpu_device
*adev)
{
- u64 addr = adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT;
-
- addr -= AMDGPU_VA_RESERVED_TOP;
-
- return addr;
+ return AMDGPU_VA_RESERVED_SEQ64_START(
+ adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT);
}
/**
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index 666698a57192..f23b6153d310 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -135,11 +135,19 @@ struct amdgpu_mem_stats;
#define AMDGPU_IS_MMHUB0(x) ((x) >= AMDGPU_MMHUB0_START && (x) <
AMDGPU_MMHUB1_START)
#define AMDGPU_IS_MMHUB1(x) ((x) >= AMDGPU_MMHUB1_START && (x) <
AMDGPU_MAX_VMHUBS)
-/* Reserve 2MB at top/bottom of address space for kernel use */
+/* Reserve space at top/bottom of address space for kernel use */
#define AMDGPU_VA_RESERVED_CSA_SIZE (2ULL << 20)
+#define AMDGPU_VA_RESERVED_CSA_START(top) ((top) \
+ - AMDGPU_VA_RESERVED_CSA_SIZE)
#define AMDGPU_VA_RESERVED_SEQ64_SIZE (2ULL << 20)
+#define AMDGPU_VA_RESERVED_SEQ64_START(top)
(AMDGPU_VA_RESERVED_CSA_START(top) \
+ - AMDGPU_VA_RESERVED_SEQ64_SIZE)
+#define AMDGPU_VA_RESERVED_TRAP_SIZE (2ULL << 12)
+#define AMDGPU_VA_RESERVED_TRAP_START(top)
(AMDGPU_VA_RESERVED_SEQ64_START(top) \
+ - AMDGPU_VA_RESERVED_TRAP_SIZE)
#define AMDGPU_VA_RESERVED_BOTTOM (2ULL << 20)
-#define AMDGPU_VA_RESERVED_TOP (AMDGPU_VA_RESERVED_SEQ64_SIZE + \
+#define AMDGPU_VA_RESERVED_TOP (AMDGPU_VA_RESERVED_TRAP_SIZE + \
+ AMDGPU_VA_RESERVED_SEQ64_SIZE + \
AMDGPU_VA_RESERVED_CSA_SIZE)
/* See vm_update_mode */
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
b/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
index 6604a3f99c5e..f899cce25b2a 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_flat_memory.c
@@ -36,6 +36,7 @@
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/processor.h>
+#include "amdgpu_vm.h"
/*
* The primary memory I/O features being added for revisions of gfxip
@@ -326,10 +327,16 @@ static void kfd_init_apertures_vi(struct
kfd_process_device *pdd, uint8_t id)
* with small reserved space for kernel.
* Set them to CANONICAL addresses.
*/
- pdd->gpuvm_base = SVM_USER_BASE;
+ pdd->gpuvm_base = max(SVM_USER_BASE, AMDGPU_VA_RESERVED_BOTTOM);
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);
}
@@ -339,18 +346,19 @@ 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);
- /* 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_base = AMDGPU_VA_RESERVED_BOTTOM;
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 = AMDGPU_VA_RESERVED_TRAP_START(
+ pdd->dev->adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT);
}
int kfd_init_apertures(struct kfd_process *process)
@@ -407,12 +415,6 @@ 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);
