drm/xe: Port Xe to GPUVA

Rather than open coding VM binds and VMA tracking, use the GPUVA
library. GPUVA provides a common infrastructure for VM binds to use mmap
/ munmap semantics and support for VK sparse bindings.

The concepts are:

1) xe_vm inherits from drm_gpuva_manager
2) xe_vma inherits from drm_gpuva
3) xe_vma_op inherits from drm_gpuva_op
4) VM bind operations (MAP, UNMAP, PREFETCH, UNMAP_ALL) call into the
GPUVA code to generate an VMA operations list which is parsed, committed,
and executed.

v2 (CI): Add break after default in case statement.
v3: Rebase
v4: Fix some error handling
v5: Use unlocked version VMA in error paths
v6: Rebase, address some review feedback mainly Thomas H
v7: Fix compile error in xe_vma_op_unwind, address checkpatch

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 45 insertions, 14 deletions

diff --git a/drivers/gpu/drm/xe/xe_vm.h b/drivers/gpu/drm/xe/xe_vm.h
index 644a8aa604e8..d386e72cb974 100644
--- a/drivers/gpu/drm/xe/xe_vm.h
+++ b/drivers/gpu/drm/xe/xe_vm.h
@@ -6,6 +6,7 @@
 #ifndef _XE_VM_H_
 #define _XE_VM_H_
 
+#include "xe_bo_types.h"
 #include "xe_macros.h"
 #include "xe_map.h"
 #include "xe_vm_types.h"
@@ -22,20 +23,19 @@ struct xe_file;
 struct xe_sync_entry;
 
 struct xe_vm *xe_vm_create(struct xe_device *xe, u32 flags);
-void xe_vm_free(struct kref *ref);
 
 struct xe_vm *xe_vm_lookup(struct xe_file *xef, u32 id);
 int xe_vma_cmp_vma_cb(const void *key, const struct rb_node *node);
 
 static inline struct xe_vm *xe_vm_get(struct xe_vm *vm)
 {
-	kref_get(&vm->refcount);
+	drm_gpuvm_get(&vm->gpuvm);
 	return vm;
 }
 
 static inline void xe_vm_put(struct xe_vm *vm)
 {
-	kref_put(&vm->refcount, xe_vm_free);
+	drm_gpuvm_put(&vm->gpuvm);
 }
 
 int xe_vm_lock(struct xe_vm *vm, struct ww_acquire_ctx *ww,
@@ -61,7 +61,22 @@ static inline bool xe_vm_is_closed_or_banned(struct xe_vm *vm)
 }
 
 struct xe_vma *
-xe_vm_find_overlapping_vma(struct xe_vm *vm, struct xe_vma *vma);
+xe_vm_find_overlapping_vma(struct xe_vm *vm, u64 start, u64 range);
+
+static inline struct xe_vm *gpuva_to_vm(struct drm_gpuva *gpuva)
+{
+	return container_of(gpuva->vm, struct xe_vm, gpuvm);
+}
+
+static inline struct xe_vma *gpuva_to_vma(struct drm_gpuva *gpuva)
+{
+	return container_of(gpuva, struct xe_vma, gpuva);
+}
+
+static inline struct xe_vma_op *gpuva_op_to_vma_op(struct drm_gpuva_op *op)
+{
+	return container_of(op, struct xe_vma_op, base);
+}
 
 /**
  * DOC: Provide accessors for vma members to facilitate easy change of
@@ -69,12 +84,12 @@ xe_vm_find_overlapping_vma(struct xe_vm *vm, struct xe_vma *vma);
  */
 static inline u64 xe_vma_start(struct xe_vma *vma)
 {
-	return vma->start;
+	return vma->gpuva.va.addr;
 }
 
 static inline u64 xe_vma_size(struct xe_vma *vma)
 {
-	return vma->end - vma->start + 1;
+	return vma->gpuva.va.range;
 }
 
 static inline u64 xe_vma_end(struct xe_vma *vma)
@@ -84,32 +99,33 @@ static inline u64 xe_vma_end(struct xe_vma *vma)
 
 static inline u64 xe_vma_bo_offset(struct xe_vma *vma)
 {
-	return vma->bo_offset;
+	return vma->gpuva.gem.offset;
 }
 
 static inline struct xe_bo *xe_vma_bo(struct xe_vma *vma)
 {
-	return vma->bo;
+	return !vma->gpuva.gem.obj ? NULL :
+		container_of(vma->gpuva.gem.obj, struct xe_bo, ttm.base);
 }
 
 static inline struct xe_vm *xe_vma_vm(struct xe_vma *vma)
 {
-	return vma->vm;
+	return container_of(vma->gpuva.vm, struct xe_vm, gpuvm);
 }
 
 static inline bool xe_vma_read_only(struct xe_vma *vma)
 {
-	return vma->pte_flags & XE_PTE_FLAG_READ_ONLY;
+	return vma->gpuva.flags & XE_VMA_READ_ONLY;
 }
 
 static inline u64 xe_vma_userptr(struct xe_vma *vma)
 {
-	return vma->userptr.ptr;
+	return vma->gpuva.gem.offset;
 }
 
 static inline bool xe_vma_is_null(struct xe_vma *vma)
 {
-	return vma->pte_flags & XE_PTE_FLAG_NULL;
+	return vma->gpuva.flags & DRM_GPUVA_SPARSE;
 }
 
 static inline bool xe_vma_has_no_bo(struct xe_vma *vma)
@@ -122,8 +138,6 @@ static inline bool xe_vma_is_userptr(struct xe_vma *vma)
 	return xe_vma_has_no_bo(vma) && !xe_vma_is_null(vma);
 }
 
-#define xe_vm_assert_held(vm) dma_resv_assert_held(&(vm)->resv)
-
 u64 xe_vm_pdp4_descriptor(struct xe_vm *vm, struct xe_tile *tile);
 
 int xe_vm_create_ioctl(struct drm_device *dev, void *data,
@@ -218,6 +232,23 @@ void xe_vm_fence_all_extobjs(struct xe_vm *vm, struct dma_fence *fence,
 
 int xe_analyze_vm(struct drm_printer *p, struct xe_vm *vm, int gt_id);
 
+/**
+ * xe_vm_resv() - Return's the vm's reservation object
+ * @vm: The vm
+ *
+ * Return: Pointer to the vm's reservation object.
+ */
+static inline struct dma_resv *xe_vm_resv(struct xe_vm *vm)
+{
+	return drm_gpuvm_resv(&vm->gpuvm);
+}
+
+/**
+ * xe_vm_assert_held(vm) - Assert that the vm's reservation object is held.
+ * @vm: The vm
+ */
+#define xe_vm_assert_held(vm) dma_resv_assert_held(xe_vm_resv(vm))
+
 #if IS_ENABLED(CONFIG_DRM_XE_DEBUG_VM)
 #define vm_dbg drm_dbg
 #else