Add SVM device memory mirroring which enables device pages for
migration.
TODO: Hide this behind Kconfig
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx
Signed-off-by: Oak Zeng <oak.zeng@xxxxxxxxx>
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/gpu/drm/xe/xe_device_types.h | 8 ++++
drivers/gpu/drm/xe/xe_svm.c | 56 +++++++++++++++++++++++++++-
drivers/gpu/drm/xe/xe_svm.h | 3 ++
drivers/gpu/drm/xe/xe_tile.c | 5 +++
4 files changed, 70 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 85bede4dd646..2ac5de7751c9 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -104,6 +104,14 @@ struct xe_mem_region {
resource_size_t actual_physical_size;
/** @mapping: pointer to VRAM mappable space */
void __iomem *mapping;
+ /** @pagemap: Used to remap device memory as ZONE_DEVICE */
+ struct dev_pagemap pagemap;
+ /**
+ * @hpa_base: base host physical address
+ *
+ * This is generated when remap device memory as ZONE_DEVICE
+ */
+ resource_size_t hpa_base;
};
/**
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 1d8021b4e2f0..22e6341117bd 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -21,6 +21,11 @@ static struct xe_vm *range_to_vm(struct drm_gpusvm_range *r)
return gpusvm_to_vm(r->gpusvm);
}
+static void *xe_svm_devm_owner(struct xe_device *xe)
+{
+ return xe;
+}
+
static struct drm_gpusvm_range *
xe_svm_range_alloc(struct drm_gpusvm *gpusvm)
{
@@ -284,8 +289,9 @@ int xe_svm_init(struct xe_vm *vm)
xe_svm_garbage_collector_work_func);
return drm_gpusvm_init(&vm->svm.gpusvm, "Xe SVM", &vm->xe->drm,
- current->mm, NULL, 0, vm->size,
- SZ_512M, &gpusvm_ops, fault_chunk_sizes,
+ current->mm, xe_svm_devm_owner(vm->xe), 0,
+ vm->size, SZ_512M, &gpusvm_ops,
+ fault_chunk_sizes,
ARRAY_SIZE(fault_chunk_sizes));
}
@@ -383,3 +389,49 @@ bool xe_svm_has_mapping(struct xe_vm *vm, u64 start, u64 end)
{
return drm_gpusvm_has_mapping(&vm->svm.gpusvm, start, end);
}
+
+/**
+ * xe_devm_add: Remap and provide memmap backing for device memory
+ * @tile: tile that the memory region belongs to
+ * @mr: memory region to remap
+ *
+ * This remap device memory to host physical address space and create
+ * struct page to back device memory
+ *
+ * Return: 0 on success standard error code otherwise
+ */
+int xe_devm_add(struct xe_tile *tile, struct xe_mem_region *mr)
+{
+ struct xe_device *xe = tile_to_xe(tile);
+ struct device *dev = &to_pci_dev(xe->drm.dev)->dev;
+ struct resource *res;
+ void *addr;
+ int ret;
+
+ res = devm_request_free_mem_region(dev, &iomem_resource,
+ mr->usable_size);
+ if (IS_ERR(res)) {
+ ret = PTR_ERR(res);
+ return ret;
+ }
+
+ mr->pagemap.type = MEMORY_DEVICE_PRIVATE;
+ mr->pagemap.range.start = res->start;
+ mr->pagemap.range.end = res->end;
+ mr->pagemap.nr_range = 1;
+ mr->pagemap.ops = drm_gpusvm_pagemap_ops_get();
+ mr->pagemap.owner = xe_svm_devm_owner(xe);
+ addr = devm_memremap_pages(dev, &mr->pagemap);
+ if (IS_ERR(addr)) {
+ devm_release_mem_region(dev, res->start, resource_size(res));
+ ret = PTR_ERR(addr);
+ drm_err(&xe->drm, "Failed to remap tile %d memory, errno %d\n",
+ tile->id, ret);
+ return ret;
+ }
+ mr->hpa_base = res->start;
+
+ drm_info(&xe->drm, "Added tile %d memory [%llx-%llx] to devm, remapped to %pr\n",
+ tile->id, mr->io_start, mr->io_start + mr->usable_size, res);
+ return 0;
+}
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 472fbc51f30e..760d22cefb1e 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -11,6 +11,7 @@
#define XE_INTERCONNECT_VRAM DRM_INTERCONNECT_DRIVER
+struct xe_mem_region;
struct xe_tile;
struct xe_vm;
struct xe_vma;
@@ -22,6 +23,8 @@ struct xe_svm_range {
u8 tile_invalidated;
};
+int xe_devm_add(struct xe_tile *tile, struct xe_mem_region *mr);
+
int xe_svm_init(struct xe_vm *vm);
void xe_svm_fini(struct xe_vm *vm);
void xe_svm_close(struct xe_vm *vm);
diff --git a/drivers/gpu/drm/xe/xe_tile.c b/drivers/gpu/drm/xe/xe_tile.c
index 07cf7cfe4abd..bbb430392dfb 100644
--- a/drivers/gpu/drm/xe/xe_tile.c
+++ b/drivers/gpu/drm/xe/xe_tile.c
@@ -13,6 +13,7 @@
#include "xe_migrate.h"
#include "xe_pcode.h"
#include "xe_sa.h"
+#include "xe_svm.h"
#include "xe_tile.h"
#include "xe_tile_sysfs.h"
#include "xe_ttm_vram_mgr.h"
@@ -164,6 +165,7 @@ static int tile_ttm_mgr_init(struct xe_tile *tile)
*/
int xe_tile_init_noalloc(struct xe_tile *tile)
{
+ struct xe_device *xe = tile_to_xe(tile);
int err;
err = tile_ttm_mgr_init(tile);
@@ -176,6 +178,9 @@ int xe_tile_init_noalloc(struct xe_tile *tile)
xe_wa_apply_tile_workarounds(tile);
+ if (xe->info.has_usm && IS_DGFX(xe))
+ xe_devm_add(tile, &tile->mem.vram);
+
err = xe_tile_sysfs_init(tile);
return 0;
--
2.34.1
