drm/amdgpu: add AMDGPU_VM_NOALLOC v2

Add the AMDGPU_VM_NOALLOC flag to let userspace control MALL allocation.

v2: also add the flag to the allowed flags.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1)
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -645,6 +645,8 @@ uint64_t amdgpu_gem_va_map_flags(struct amdgpu_device *adev, uint32_t flags)
 		pte_flag |= AMDGPU_PTE_WRITEABLE;
 	if (flags & AMDGPU_VM_PAGE_PRT)
 		pte_flag |= AMDGPU_PTE_PRT;
+	if (flags & AMDGPU_VM_PAGE_NOALLOC)
+		pte_flag |= AMDGPU_PTE_NOALLOC;
 
 	if (adev->gmc.gmc_funcs->map_mtype)
 		pte_flag |= amdgpu_gmc_map_mtype(adev,
@@ -658,7 +660,8 @@ int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
 {
 	const uint32_t valid_flags = AMDGPU_VM_DELAY_UPDATE |
 		AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE |
-		AMDGPU_VM_PAGE_EXECUTABLE | AMDGPU_VM_MTYPE_MASK;
+		AMDGPU_VM_PAGE_EXECUTABLE | AMDGPU_VM_MTYPE_MASK |
+		AMDGPU_VM_PAGE_NOALLOC;
 	const uint32_t prt_flags = AMDGPU_VM_DELAY_UPDATE |
 		AMDGPU_VM_PAGE_PRT;
 

drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c

@@ -613,6 +613,9 @@ static void gmc_v10_0_get_vm_pte(struct amdgpu_device *adev,
 	*flags &= ~AMDGPU_PTE_MTYPE_NV10_MASK;
 	*flags |= (mapping->flags & AMDGPU_PTE_MTYPE_NV10_MASK);
 
+	*flags &= ~AMDGPU_PTE_NOALLOC;
+	*flags |= (mapping->flags & AMDGPU_PTE_NOALLOC);
+
 	if (mapping->flags & AMDGPU_PTE_PRT) {
 		*flags |= AMDGPU_PTE_PRT;
 		*flags |= AMDGPU_PTE_SNOOPED;

drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c

@@ -500,6 +500,9 @@ static void gmc_v11_0_get_vm_pte(struct amdgpu_device *adev,
 	*flags &= ~AMDGPU_PTE_MTYPE_NV10_MASK;
 	*flags |= (mapping->flags & AMDGPU_PTE_MTYPE_NV10_MASK);
 
+	*flags &= ~AMDGPU_PTE_NOALLOC;
+	*flags |= (mapping->flags & AMDGPU_PTE_NOALLOC);
+
 	if (mapping->flags & AMDGPU_PTE_PRT) {
 		*flags |= AMDGPU_PTE_PRT;
 		*flags |= AMDGPU_PTE_SNOOPED;

include/uapi/drm/amdgpu_drm.h

@@ -533,6 +533,8 @@ struct drm_amdgpu_gem_op {
 #define AMDGPU_VM_MTYPE_UC		(4 << 5)
 /* Use Read Write MTYPE instead of default MTYPE */
 #define AMDGPU_VM_MTYPE_RW		(5 << 5)
+/* don't allocate MALL */
+#define AMDGPU_VM_PAGE_NOALLOC		(1 << 9)
 
 struct drm_amdgpu_gem_va {
 	/** GEM object handle */