drm/xe: Introduce CONFIG_DRM_XE_GPUSVM

Don't rely on CONFIG_DRM_GPUSVM because other drivers may enable it
causing us to compile in SVM support unintentionally.

Also take the opportunity to leave more code out of compilation if
!CONFIG_DRM_XE_GPUSVM and !CONFIG_DRM_XE_DEVMEM_MIRROR

v3:
- Fixes for compilation errors on 32-bit. This changes the Kconfig
  logic a bit.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://lore.kernel.org/r/20250326080551.40201-2-thomas.hellstrom@linux.intel.com

drivers/gpu/drm/xe/Kconfig

@@ -39,7 +39,6 @@ config DRM_XE
 	select DRM_TTM_HELPER
 	select DRM_EXEC
 	select DRM_GPUVM
-	select DRM_GPUSVM if !UML && DEVICE_PRIVATE
 	select DRM_SCHED
 	select MMU_NOTIFIER
 	select WANT_DEV_COREDUMP
@@ -74,9 +73,22 @@ config DRM_XE_DP_TUNNEL
 
 	  If in doubt say "Y".
 
+config DRM_XE_GPUSVM
+	bool "Enable CPU to GPU address mirroring"
+	depends on DRM_XE
+	depends on !UML
+	depends on DEVICE_PRIVATE
+	default y
+	select DRM_GPUSVM
+	help
+	  Enable this option if you want support for CPU to GPU address
+	  mirroring.
+
+	  If in doubut say "Y".
+
 config DRM_XE_DEVMEM_MIRROR
 	bool "Enable device memory mirror"
-	depends on DRM_XE
+	depends on DRM_XE_GPUSVM
 	select GET_FREE_REGION
 	default y
 	help

drivers/gpu/drm/xe/Makefile

@@ -125,7 +125,7 @@ xe-y += xe_bb.o \
 	xe_wopcm.o
 
 xe-$(CONFIG_HMM_MIRROR) += xe_hmm.o
-xe-$(CONFIG_DRM_GPUSVM) += xe_svm.o
+xe-$(CONFIG_DRM_XE_GPUSVM) += xe_svm.o
 
 # graphics hardware monitoring (HWMON) support
 xe-$(CONFIG_HWMON) += xe_hwmon.o

drivers/gpu/drm/xe/xe_device_types.h

@@ -107,6 +107,9 @@ struct xe_vram_region {
 	resource_size_t actual_physical_size;
 	/** @mapping: pointer to VRAM mappable space */
 	void __iomem *mapping;
+	/** @ttm: VRAM TTM manager */
+	struct xe_ttm_vram_mgr ttm;
+#if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)
 	/** @pagemap: Used to remap device memory as ZONE_DEVICE */
 	struct dev_pagemap pagemap;
 	/**
@@ -120,8 +123,7 @@ struct xe_vram_region {
 	 * This is generated when remap device memory as ZONE_DEVICE
 	 */
 	resource_size_t hpa_base;
-	/** @ttm: VRAM TTM manager */
-	struct xe_ttm_vram_mgr ttm;
+#endif
 };
 
 /**

drivers/gpu/drm/xe/xe_migrate.c

@@ -1544,6 +1544,7 @@ void xe_migrate_wait(struct xe_migrate *m)
 		dma_fence_wait(m->fence, false);
 }
 
+#if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)
 static u32 pte_update_cmd_size(u64 size)
 {
 	u32 num_dword;
@@ -1719,6 +1720,8 @@ struct dma_fence *xe_migrate_from_vram(struct xe_migrate *m,
 			       XE_MIGRATE_COPY_TO_SRAM);
 }
 
+#endif
+
 #if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
 #include "tests/xe_migrate.c"
 #endif

drivers/gpu/drm/xe/xe_pt.c

@@ -1420,6 +1420,7 @@ static int xe_pt_userptr_pre_commit(struct xe_migrate_pt_update *pt_update)
 	return err;
 }
 
+#if IS_ENABLED(CONFIG_DRM_XE_GPUSVM)
 static int xe_pt_svm_pre_commit(struct xe_migrate_pt_update *pt_update)
 {
 	struct xe_vm *vm = pt_update->vops->vm;
@@ -1453,6 +1454,7 @@ static int xe_pt_svm_pre_commit(struct xe_migrate_pt_update *pt_update)
 
 	return 0;
 }
+#endif
 
 struct invalidation_fence {
 	struct xe_gt_tlb_invalidation_fence base;
@@ -2257,11 +2259,15 @@ static const struct xe_migrate_pt_update_ops userptr_migrate_ops = {
 	.pre_commit = xe_pt_userptr_pre_commit,
 };
 
+#if IS_ENABLED(CONFIG_DRM_XE_GPUSVM)
 static const struct xe_migrate_pt_update_ops svm_migrate_ops = {
 	.populate = xe_vm_populate_pgtable,
 	.clear = xe_migrate_clear_pgtable_callback,
 	.pre_commit = xe_pt_svm_pre_commit,
 };
+#else
+static const struct xe_migrate_pt_update_ops svm_migrate_ops;
+#endif
 
 /**
  * xe_pt_update_ops_run() - Run PT update operations

drivers/gpu/drm/xe/xe_query.c

@@ -340,7 +340,7 @@ static int query_config(struct xe_device *xe, struct drm_xe_device_query *query)
 	if (xe_device_get_root_tile(xe)->mem.vram.usable_size)
 		config->info[DRM_XE_QUERY_CONFIG_FLAGS] |=
 			DRM_XE_QUERY_CONFIG_FLAG_HAS_VRAM;
-	if (xe->info.has_usm && IS_ENABLED(CONFIG_DRM_GPUSVM))
+	if (xe->info.has_usm && IS_ENABLED(CONFIG_DRM_XE_GPUSVM))
 		config->info[DRM_XE_QUERY_CONFIG_FLAGS] |=
 			DRM_XE_QUERY_CONFIG_FLAG_HAS_CPU_ADDR_MIRROR;
 	config->info[DRM_XE_QUERY_CONFIG_FLAGS] |=

drivers/gpu/drm/xe/xe_svm.c

@@ -340,6 +340,8 @@ static void xe_svm_garbage_collector_work_func(struct work_struct *w)
 	up_write(&vm->lock);
 }
 
+#if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)
+
 static struct xe_vram_region *page_to_vr(struct page *page)
 {
 	return container_of(page->pgmap, struct xe_vram_region, pagemap);
@@ -578,6 +580,8 @@ static const struct drm_gpusvm_devmem_ops gpusvm_devmem_ops = {
 	.copy_to_ram = xe_svm_copy_to_ram,
 };
 
+#endif
+
 static const struct drm_gpusvm_ops gpusvm_ops = {
 	.range_alloc = xe_svm_range_alloc,
 	.range_free = xe_svm_range_free,
@@ -651,6 +655,7 @@ static bool xe_svm_range_is_valid(struct xe_svm_range *range,
 	return (range->tile_present & ~range->tile_invalidated) & BIT(tile->id);
 }
 
+#if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)
 static struct xe_vram_region *tile_to_vr(struct xe_tile *tile)
 {
 	return &tile->mem.vram;
@@ -709,6 +714,15 @@ unlock:
 
 	return err;
 }
+#else
+static int xe_svm_alloc_vram(struct xe_vm *vm, struct xe_tile *tile,
+			     struct xe_svm_range *range,
+			     const struct drm_gpusvm_ctx *ctx)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 
 /**
  * xe_svm_handle_pagefault() - SVM handle page fault
@@ -867,6 +881,7 @@ int xe_svm_bo_evict(struct xe_bo *bo)
 }
 
 #if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)
+
 static struct drm_pagemap_device_addr
 xe_drm_pagemap_device_map(struct drm_pagemap *dpagemap,
 			  struct device *dev,

drivers/gpu/drm/xe/xe_svm.h

@@ -6,6 +6,8 @@
 #ifndef _XE_SVM_H_
 #define _XE_SVM_H_
 
+#if IS_ENABLED(CONFIG_DRM_XE_GPUSVM)
+
 #include <drm/drm_pagemap.h>
 #include <drm/drm_gpusvm.h>
 
@@ -44,7 +46,6 @@ struct xe_svm_range {
 	u8 skip_migrate	:1;
 };
 
-#if IS_ENABLED(CONFIG_DRM_GPUSVM)
 /**
  * xe_svm_range_pages_valid() - SVM range pages valid
  * @range: SVM range
@@ -73,7 +74,50 @@ bool xe_svm_has_mapping(struct xe_vm *vm, u64 start, u64 end);
 int xe_svm_bo_evict(struct xe_bo *bo);
 
 void xe_svm_range_debug(struct xe_svm_range *range, const char *operation);
+
+/**
+ * xe_svm_range_has_dma_mapping() - SVM range has DMA mapping
+ * @range: SVM range
+ *
+ * Return: True if SVM range has a DMA mapping, False otherwise
+ */
+static inline bool xe_svm_range_has_dma_mapping(struct xe_svm_range *range)
+{
+	lockdep_assert_held(&range->base.gpusvm->notifier_lock);
+	return range->base.flags.has_dma_mapping;
+}
+
+#define xe_svm_assert_in_notifier(vm__) \
+	lockdep_assert_held_write(&(vm__)->svm.gpusvm.notifier_lock)
+
+#define xe_svm_notifier_lock(vm__)	\
+	drm_gpusvm_notifier_lock(&(vm__)->svm.gpusvm)
+
+#define xe_svm_notifier_unlock(vm__)	\
+	drm_gpusvm_notifier_unlock(&(vm__)->svm.gpusvm)
+
 #else
+#include <linux/interval_tree.h>
+
+struct drm_pagemap_device_addr;
+struct xe_bo;
+struct xe_gt;
+struct xe_vm;
+struct xe_vma;
+struct xe_tile;
+struct xe_vram_region;
+
+#define XE_INTERCONNECT_VRAM 1
+
+struct xe_svm_range {
+	struct {
+		struct interval_tree_node itree;
+		const struct drm_pagemap_device_addr *dma_addr;
+	} base;
+	u32 tile_present;
+	u32 tile_invalidated;
+};
+
 static inline bool xe_svm_range_pages_valid(struct xe_svm_range *range)
 {
 	return false;
@@ -125,27 +169,16 @@ static inline
 void xe_svm_range_debug(struct xe_svm_range *range, const char *operation)
 {
 }
-#endif
 
-/**
- * xe_svm_range_has_dma_mapping() - SVM range has DMA mapping
- * @range: SVM range
- *
- * Return: True if SVM range has a DMA mapping, False otherwise
- */
-static inline bool xe_svm_range_has_dma_mapping(struct xe_svm_range *range)
+#define xe_svm_assert_in_notifier(...) do {} while (0)
+#define xe_svm_range_has_dma_mapping(...) false
+
+static inline void xe_svm_notifier_lock(struct xe_vm *vm)
 {
-	lockdep_assert_held(&range->base.gpusvm->notifier_lock);
-	return range->base.flags.has_dma_mapping;
 }
 
-#define xe_svm_assert_in_notifier(vm__) \
-	lockdep_assert_held_write(&(vm__)->svm.gpusvm.notifier_lock)
-
-#define xe_svm_notifier_lock(vm__)	\
-	drm_gpusvm_notifier_lock(&(vm__)->svm.gpusvm)
-
-#define xe_svm_notifier_unlock(vm__)	\
-	drm_gpusvm_notifier_unlock(&(vm__)->svm.gpusvm)
-
+static inline void xe_svm_notifier_unlock(struct xe_vm *vm)
+{
+}
+#endif
 #endif

drivers/gpu/drm/xe/xe_vm.c

@@ -3109,7 +3109,7 @@ static int vm_bind_ioctl_check_args(struct xe_device *xe, struct xe_vm *vm,
 
 		if (XE_IOCTL_DBG(xe, is_cpu_addr_mirror &&
 				 (!xe_vm_in_fault_mode(vm) ||
-				 !IS_ENABLED(CONFIG_DRM_GPUSVM)))) {
+				 !IS_ENABLED(CONFIG_DRM_XE_GPUSVM)))) {
 			err = -EINVAL;
 			goto free_bind_ops;
 		}