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// SPDX-License-Identifier: MIT
/*
* Copyright © 2022 Intel Corporation
*/
#include "xe_dma_buf.h"
#include <kunit/test.h>
#include <linux/dma-buf.h>
#include <linux/pci-p2pdma.h>
#include <drm/drm_device.h>
#include <drm/drm_prime.h>
#include <drm/ttm/ttm_tt.h>
#include "tests/xe_test.h"
#include "xe_bo.h"
#include "xe_device.h"
#include "xe_pm.h"
#include "xe_ttm_vram_mgr.h"
#include "xe_vm.h"
MODULE_IMPORT_NS(DMA_BUF);
static int xe_dma_buf_attach(struct dma_buf *dmabuf,
struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
if (attach->peer2peer &&
pci_p2pdma_distance(to_pci_dev(obj->dev->dev), attach->dev, false) < 0)
attach->peer2peer = false;
if (!attach->peer2peer && !xe_bo_can_migrate(gem_to_xe_bo(obj), XE_PL_TT))
return -EOPNOTSUPP;
xe_pm_runtime_get(to_xe_device(obj->dev));
return 0;
}
static void xe_dma_buf_detach(struct dma_buf *dmabuf,
struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
xe_pm_runtime_put(to_xe_device(obj->dev));
}
static int xe_dma_buf_pin(struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct xe_bo *bo = gem_to_xe_bo(obj);
struct xe_device *xe = xe_bo_device(bo);
int ret;
/*
* For now only support pinning in TT memory, for two reasons:
* 1) Avoid pinning in a placement not accessible to some importers.
* 2) Pinning in VRAM requires PIN accounting which is a to-do.
*/
if (xe_bo_is_pinned(bo) && bo->ttm.resource->placement != XE_PL_TT) {
drm_dbg(&xe->drm, "Can't migrate pinned bo for dma-buf pin.\n");
return -EINVAL;
}
ret = xe_bo_migrate(bo, XE_PL_TT);
if (ret) {
if (ret != -EINTR && ret != -ERESTARTSYS)
drm_dbg(&xe->drm,
"Failed migrating dma-buf to TT memory: %pe\n",
ERR_PTR(ret));
return ret;
}
ret = xe_bo_pin_external(bo);
xe_assert(xe, !ret);
return 0;
}
static void xe_dma_buf_unpin(struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->dmabuf->priv;
struct xe_bo *bo = gem_to_xe_bo(obj);
xe_bo_unpin_external(bo);
}
static struct sg_table *xe_dma_buf_map(struct dma_buf_attachment *attach,
enum dma_data_direction dir)
{
struct dma_buf *dma_buf = attach->dmabuf;
struct drm_gem_object *obj = dma_buf->priv;
struct xe_bo *bo = gem_to_xe_bo(obj);
struct sg_table *sgt;
int r = 0;
if (!attach->peer2peer && !xe_bo_can_migrate(bo, XE_PL_TT))
return ERR_PTR(-EOPNOTSUPP);
if (!xe_bo_is_pinned(bo)) {
if (!attach->peer2peer)
r = xe_bo_migrate(bo, XE_PL_TT);
else
r = xe_bo_validate(bo, NULL, false);
if (r)
return ERR_PTR(r);
}
switch (bo->ttm.resource->mem_type) {
case XE_PL_TT:
sgt = drm_prime_pages_to_sg(obj->dev,
bo->ttm.ttm->pages,
bo->ttm.ttm->num_pages);
if (IS_ERR(sgt))
return sgt;
if (dma_map_sgtable(attach->dev, sgt, dir,
DMA_ATTR_SKIP_CPU_SYNC))
goto error_free;
break;
case XE_PL_VRAM0:
case XE_PL_VRAM1:
r = xe_ttm_vram_mgr_alloc_sgt(xe_bo_device(bo),
bo->ttm.resource, 0,
bo->ttm.base.size, attach->dev,
dir, &sgt);
if (r)
return ERR_PTR(r);
break;
default:
return ERR_PTR(-EINVAL);
}
return sgt;
error_free:
sg_free_table(sgt);
kfree(sgt);
return ERR_PTR(-EBUSY);
}
static void xe_dma_buf_unmap(struct dma_buf_attachment *attach,
struct sg_table *sgt,
enum dma_data_direction dir)
{
struct dma_buf *dma_buf = attach->dmabuf;
struct xe_bo *bo = gem_to_xe_bo(dma_buf->priv);
if (!xe_bo_is_vram(bo)) {
dma_unmap_sgtable(attach->dev, sgt, dir, 0);
sg_free_table(sgt);
kfree(sgt);
} else {
xe_ttm_vram_mgr_free_sgt(attach->dev, dir, sgt);
}
}
static int xe_dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
enum dma_data_direction direction)
{
struct drm_gem_object *obj = dma_buf->priv;
struct xe_bo *bo = gem_to_xe_bo(obj);
bool reads = (direction == DMA_BIDIRECTIONAL ||
direction == DMA_FROM_DEVICE);
if (!reads)
return 0;
/* Can we do interruptible lock here? */
xe_bo_lock(bo, false);
(void)xe_bo_migrate(bo, XE_PL_TT);
xe_bo_unlock(bo);
return 0;
}
static const struct dma_buf_ops xe_dmabuf_ops = {
.attach = xe_dma_buf_attach,
.detach = xe_dma_buf_detach,
.pin = xe_dma_buf_pin,
.unpin = xe_dma_buf_unpin,
.map_dma_buf = xe_dma_buf_map,
.unmap_dma_buf = xe_dma_buf_unmap,
.release = drm_gem_dmabuf_release,
.begin_cpu_access = xe_dma_buf_begin_cpu_access,
.mmap = drm_gem_dmabuf_mmap,
.vmap = drm_gem_dmabuf_vmap,
.vunmap = drm_gem_dmabuf_vunmap,
};
struct dma_buf *xe_gem_prime_export(struct drm_gem_object *obj, int flags)
{
struct xe_bo *bo = gem_to_xe_bo(obj);
struct dma_buf *buf;
if (bo->vm)
return ERR_PTR(-EPERM);
buf = drm_gem_prime_export(obj, flags);
if (!IS_ERR(buf))
buf->ops = &xe_dmabuf_ops;
return buf;
}
static struct drm_gem_object *
xe_dma_buf_init_obj(struct drm_device *dev, struct xe_bo *storage,
struct dma_buf *dma_buf)
{
struct dma_resv *resv = dma_buf->resv;
struct xe_device *xe = to_xe_device(dev);
struct xe_bo *bo;
int ret;
dma_resv_lock(resv, NULL);
bo = ___xe_bo_create_locked(xe, storage, NULL, resv, NULL, dma_buf->size,
0, /* Will require 1way or 2way for vm_bind */
ttm_bo_type_sg, XE_BO_CREATE_SYSTEM_BIT);
if (IS_ERR(bo)) {
ret = PTR_ERR(bo);
goto error;
}
dma_resv_unlock(resv);
return &bo->ttm.base;
error:
dma_resv_unlock(resv);
return ERR_PTR(ret);
}
static void xe_dma_buf_move_notify(struct dma_buf_attachment *attach)
{
struct drm_gem_object *obj = attach->importer_priv;
struct xe_bo *bo = gem_to_xe_bo(obj);
XE_WARN_ON(xe_bo_evict(bo, false));
}
static const struct dma_buf_attach_ops xe_dma_buf_attach_ops = {
.allow_peer2peer = true,
.move_notify = xe_dma_buf_move_notify
};
#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
struct dma_buf_test_params {
struct xe_test_priv base;
const struct dma_buf_attach_ops *attach_ops;
bool force_different_devices;
u32 mem_mask;
};
#define to_dma_buf_test_params(_priv) \
container_of(_priv, struct dma_buf_test_params, base)
#endif
struct drm_gem_object *xe_gem_prime_import(struct drm_device *dev,
struct dma_buf *dma_buf)
{
XE_TEST_DECLARE(struct dma_buf_test_params *test =
to_dma_buf_test_params
(xe_cur_kunit_priv(XE_TEST_LIVE_DMA_BUF));)
const struct dma_buf_attach_ops *attach_ops;
struct dma_buf_attachment *attach;
struct drm_gem_object *obj;
struct xe_bo *bo;
if (dma_buf->ops == &xe_dmabuf_ops) {
obj = dma_buf->priv;
if (obj->dev == dev &&
!XE_TEST_ONLY(test && test->force_different_devices)) {
/*
* Importing dmabuf exported from out own gem increases
* refcount on gem itself instead of f_count of dmabuf.
*/
drm_gem_object_get(obj);
return obj;
}
}
/*
* Don't publish the bo until we have a valid attachment, and a
* valid attachment needs the bo address. So pre-create a bo before
* creating the attachment and publish.
*/
bo = xe_bo_alloc();
if (IS_ERR(bo))
return ERR_CAST(bo);
attach_ops = &xe_dma_buf_attach_ops;
#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
if (test)
attach_ops = test->attach_ops;
#endif
attach = dma_buf_dynamic_attach(dma_buf, dev->dev, attach_ops, &bo->ttm.base);
if (IS_ERR(attach)) {
obj = ERR_CAST(attach);
goto out_err;
}
/* Errors here will take care of freeing the bo. */
obj = xe_dma_buf_init_obj(dev, bo, dma_buf);
if (IS_ERR(obj))
return obj;
get_dma_buf(dma_buf);
obj->import_attach = attach;
return obj;
out_err:
xe_bo_free(bo);
return obj;
}
#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST)
#include "tests/xe_dma_buf.c"
#endif
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