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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2025, Advanced Micro Devices, Inc.
*/
#include <drm/amdxdna_accel.h>
#include <drm/drm_device.h>
#include <drm/drm_print.h>
#include <linux/dma-buf.h>
#include <linux/overflow.h>
#include <linux/pagemap.h>
#include <linux/vmalloc.h>
#include "amdxdna_pci_drv.h"
#include "amdxdna_ubuf.h"
struct amdxdna_ubuf_priv {
struct page **pages;
u64 nr_pages;
struct mm_struct *mm;
};
static struct sg_table *amdxdna_ubuf_map(struct dma_buf_attachment *attach,
enum dma_data_direction direction)
{
struct amdxdna_ubuf_priv *ubuf = attach->dmabuf->priv;
struct sg_table *sg;
int ret;
sg = kzalloc_obj(*sg);
if (!sg)
return ERR_PTR(-ENOMEM);
ret = sg_alloc_table_from_pages(sg, ubuf->pages, ubuf->nr_pages, 0,
ubuf->nr_pages << PAGE_SHIFT, GFP_KERNEL);
if (ret)
goto err_free_sg;
ret = dma_map_sgtable(attach->dev, sg, direction, 0);
if (ret)
goto err_free_table;
return sg;
err_free_table:
sg_free_table(sg);
err_free_sg:
kfree(sg);
return ERR_PTR(ret);
}
static void amdxdna_ubuf_unmap(struct dma_buf_attachment *attach,
struct sg_table *sg,
enum dma_data_direction direction)
{
dma_unmap_sgtable(attach->dev, sg, direction, 0);
sg_free_table(sg);
kfree(sg);
}
static void amdxdna_ubuf_release(struct dma_buf *dbuf)
{
struct amdxdna_ubuf_priv *ubuf = dbuf->priv;
unpin_user_pages(ubuf->pages, ubuf->nr_pages);
kvfree(ubuf->pages);
atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
mmdrop(ubuf->mm);
kfree(ubuf);
}
static const struct dma_buf_ops amdxdna_ubuf_dmabuf_ops = {
.map_dma_buf = amdxdna_ubuf_map,
.unmap_dma_buf = amdxdna_ubuf_unmap,
.release = amdxdna_ubuf_release,
};
struct dma_buf *amdxdna_get_ubuf(struct drm_device *dev,
u32 num_entries, void __user *va_entries)
{
struct amdxdna_dev *xdna = to_xdna_dev(dev);
unsigned long lock_limit, new_pinned;
struct amdxdna_drm_va_entry *va_ent;
struct amdxdna_ubuf_priv *ubuf;
u32 npages, start = 0;
struct dma_buf *dbuf;
int i, ret;
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
if (!can_do_mlock())
return ERR_PTR(-EPERM);
ubuf = kzalloc_obj(*ubuf);
if (!ubuf)
return ERR_PTR(-ENOMEM);
ubuf->mm = current->mm;
mmgrab(ubuf->mm);
va_ent = kvzalloc_objs(*va_ent, num_entries);
if (!va_ent) {
ret = -ENOMEM;
goto free_ubuf;
}
if (copy_from_user(va_ent, va_entries, sizeof(*va_ent) * num_entries)) {
XDNA_DBG(xdna, "Access va entries failed");
ret = -EINVAL;
goto free_ent;
}
for (i = 0, exp_info.size = 0; i < num_entries; i++) {
if (!IS_ALIGNED(va_ent[i].vaddr, PAGE_SIZE) ||
!IS_ALIGNED(va_ent[i].len, PAGE_SIZE)) {
XDNA_ERR(xdna, "Invalid address or len %llx, %llx",
va_ent[i].vaddr, va_ent[i].len);
ret = -EINVAL;
goto free_ent;
}
if (check_add_overflow(exp_info.size, va_ent[i].len, &exp_info.size)) {
ret = -EINVAL;
goto free_ent;
}
}
ubuf->nr_pages = exp_info.size >> PAGE_SHIFT;
lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
new_pinned = atomic64_add_return(ubuf->nr_pages, &ubuf->mm->pinned_vm);
if (new_pinned > lock_limit && !capable(CAP_IPC_LOCK)) {
XDNA_DBG(xdna, "New pin %ld, limit %ld, cap %d",
new_pinned, lock_limit, capable(CAP_IPC_LOCK));
ret = -ENOMEM;
goto sub_pin_cnt;
}
ubuf->pages = kvmalloc_objs(*ubuf->pages, ubuf->nr_pages);
if (!ubuf->pages) {
ret = -ENOMEM;
goto sub_pin_cnt;
}
for (i = 0; i < num_entries; i++) {
npages = va_ent[i].len >> PAGE_SHIFT;
ret = pin_user_pages_fast(va_ent[i].vaddr, npages,
FOLL_WRITE | FOLL_LONGTERM,
&ubuf->pages[start]);
if (ret >= 0) {
start += ret;
if (ret != npages) {
XDNA_ERR(xdna, "Partially pinned pages %d/%u", ret, npages);
ret = -ENOMEM;
goto destroy_pages;
}
} else {
XDNA_ERR(xdna, "Failed to pin pages ret %d", ret);
goto destroy_pages;
}
}
exp_info.ops = &amdxdna_ubuf_dmabuf_ops;
exp_info.priv = ubuf;
exp_info.flags = O_RDWR | O_CLOEXEC;
dbuf = dma_buf_export(&exp_info);
if (IS_ERR(dbuf)) {
ret = PTR_ERR(dbuf);
goto destroy_pages;
}
kvfree(va_ent);
return dbuf;
destroy_pages:
if (start)
unpin_user_pages(ubuf->pages, start);
kvfree(ubuf->pages);
sub_pin_cnt:
atomic64_sub(ubuf->nr_pages, &ubuf->mm->pinned_vm);
free_ent:
kvfree(va_ent);
free_ubuf:
mmdrop(ubuf->mm);
kfree(ubuf);
return ERR_PTR(ret);
}
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