[RFC 15/29] drm/xe/vm: Add attributes struct as member of vma

[Himal Prasad Ghimiray]

The attribute of xe_vma will determine the migration policy and the
encoding of the page table entries (PTEs) for that vma.
This attribute helps manage how memory pages are moved and how their
addresses are translated. It will be used by madvise to set the
behavior of the vma.

Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
---
 drivers/gpu/drm/xe/xe_vm.c       |  6 ++++++
 drivers/gpu/drm/xe/xe_vm_types.h | 20 ++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index f63dd4eb1ae8..369a9527af79 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2440,6 +2440,12 @@ static struct xe_vma *new_vma(struct xe_vm *vm, struct drm_gpuva_op_map *op,
 		vma = ERR_PTR(err);
 	}
 
+	/*TODO: assign devmem_fd of local vram once multi device
+	 * support is added.
+	 */
+	vma->attr.preferred_loc.devmem_fd = 1;
+	vma->attr.atomic_access = DRM_XE_VMA_ATOMIC_UNDEFINED;
+
 	return vma;
 }
 
diff --git a/drivers/gpu/drm/xe/xe_vm_types.h b/drivers/gpu/drm/xe/xe_vm_types.h
index 0b02a37bd2f3..b69dfe1646ed 100644
--- a/drivers/gpu/drm/xe/xe_vm_types.h
+++ b/drivers/gpu/drm/xe/xe_vm_types.h
@@ -77,6 +77,19 @@ struct xe_userptr {
 #endif
 };
 
+/**
+ * struct xe_vma_mem_attr - memory attributes associated with vma
+ */
+struct xe_vma_mem_attr {
+	/** @preferred_loc: perferred memory_location*/
+	struct {
+		u32 migration_policy; /* represents migration policies */
+		u32 devmem_fd; /* devmem_fd used for determining pagemap_fd requested by user */
+	} preferred_loc;
+	/** @atomic_access: The atomic access type for the vma */
+	u32 atomic_access;
+};
+
 struct xe_vma {
 	/** @gpuva: Base GPUVA object */
 	struct drm_gpuva gpuva;
@@ -128,6 +141,13 @@ struct xe_vma {
 	 * Needs to be signalled before UNMAP can be processed.
 	 */
 	struct xe_user_fence *ufence;
+
+	/**
+	 * @attr: The attributes of vma which determines the migration policy
+	 * and encoding of the PTEs for this vma.
+	 */
+	struct xe_vma_mem_attr attr;
+
 };
 
 /**
-- 
2.34.1