drm/radeon/kms: check if vm is supported in VA ioctl

Add a VM manager enabled field and use it to check if
vm is enabled.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: jglisse@redhat.com
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon.h

@@ -668,6 +668,8 @@ struct radeon_vm_manager {
 	unsigned			nvm;
 	/* vram base address for page table entry  */
 	u64				vram_base_offset;
+	/* is vm enabled? */
+	bool				enabled;
 };
 
 /*

drivers/gpu/drm/radeon/radeon_cs.c

@@ -234,8 +234,8 @@ int radeon_cs_parser_init(struct radeon_cs_parser *p, void *data)
 	}
 
 	if ((p->cs_flags & RADEON_CS_USE_VM) &&
-	    (p->rdev->family < CHIP_CAYMAN)) {
-		DRM_ERROR("VM not supported on asic!\n");
+	    !p->rdev->vm_manager.enabled) {
+		DRM_ERROR("VM not active on asic!\n");
 		if (p->chunk_relocs_idx != -1)
 			kfree(p->chunks[p->chunk_relocs_idx].kdata);
 		if (p->chunk_flags_idx != -1)

drivers/gpu/drm/radeon/radeon_gart.c

@@ -286,6 +286,8 @@ int radeon_vm_manager_init(struct radeon_device *rdev)
 {
 	int r;
 
+	rdev->vm_manager.enabled = false;
+
 	/* mark first vm as always in use, it's the system one */
 	r = radeon_sa_bo_manager_init(rdev, &rdev->vm_manager.sa_manager,
 				      rdev->vm_manager.max_pfn * 8,
@@ -295,7 +297,12 @@ int radeon_vm_manager_init(struct radeon_device *rdev)
 			(rdev->vm_manager.max_pfn * 8) >> 10);
 		return r;
 	}
-	return rdev->vm_manager.funcs->init(rdev);
+
+	r = rdev->vm_manager.funcs->init(rdev);
+	if (r == 0)
+		rdev->vm_manager.enabled = true;
+
+	return r;
 }
 
 /* cs mutex must be lock */
@@ -334,6 +341,7 @@ void radeon_vm_manager_fini(struct radeon_device *rdev)
 	radeon_vm_manager_suspend(rdev);
 	rdev->vm_manager.funcs->fini(rdev);
 	radeon_sa_bo_manager_fini(rdev, &rdev->vm_manager.sa_manager);
+	rdev->vm_manager.enabled = false;
 }
 
 int radeon_vm_manager_start(struct radeon_device *rdev)

drivers/gpu/drm/radeon/radeon_gem.c

@@ -404,6 +404,11 @@ int radeon_gem_va_ioctl(struct drm_device *dev, void *data,
 	u32 invalid_flags;
 	int r = 0;
 
+	if (!rdev->vm_manager.enabled) {
+		args->operation = RADEON_VA_RESULT_ERROR;
+		return -ENOTTY;
+	}
+
 	/* !! DONT REMOVE !!
 	 * We don't support vm_id yet, to be sure we don't have have broken
 	 * userspace, reject anyone trying to use non 0 value thus moving