From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/drivers/xen/gntdev-dmabuf.c | 56 ++++++++++++++++++--------------------------------------
1 files changed, 18 insertions(+), 38 deletions(-)
diff --git a/kernel/drivers/xen/gntdev-dmabuf.c b/kernel/drivers/xen/gntdev-dmabuf.c
index f658956..4c13cbc 100644
--- a/kernel/drivers/xen/gntdev-dmabuf.c
+++ b/kernel/drivers/xen/gntdev-dmabuf.c
@@ -247,10 +247,9 @@
if (sgt) {
if (gntdev_dmabuf_attach->dir != DMA_NONE)
- dma_unmap_sg_attrs(attach->dev, sgt->sgl,
- sgt->nents,
- gntdev_dmabuf_attach->dir,
- DMA_ATTR_SKIP_CPU_SYNC);
+ dma_unmap_sgtable(attach->dev, sgt,
+ gntdev_dmabuf_attach->dir,
+ DMA_ATTR_SKIP_CPU_SYNC);
sg_free_table(sgt);
}
@@ -288,8 +287,8 @@
sgt = dmabuf_pages_to_sgt(gntdev_dmabuf->pages,
gntdev_dmabuf->nr_pages);
if (!IS_ERR(sgt)) {
- if (!dma_map_sg_attrs(attach->dev, sgt->sgl, sgt->nents, dir,
- DMA_ATTR_SKIP_CPU_SYNC)) {
+ if (dma_map_sgtable(attach->dev, sgt, dir,
+ DMA_ATTR_SKIP_CPU_SYNC)) {
sg_free_table(sgt);
kfree(sgt);
sgt = ERR_PTR(-ENOMEM);
@@ -342,35 +341,12 @@
mutex_unlock(&priv->lock);
}
-static void *dmabuf_exp_ops_kmap(struct dma_buf *dma_buf,
- unsigned long page_num)
-{
- /* Not implemented. */
- return NULL;
-}
-
-static void dmabuf_exp_ops_kunmap(struct dma_buf *dma_buf,
- unsigned long page_num, void *addr)
-{
- /* Not implemented. */
-}
-
-static int dmabuf_exp_ops_mmap(struct dma_buf *dma_buf,
- struct vm_area_struct *vma)
-{
- /* Not implemented. */
- return 0;
-}
-
static const struct dma_buf_ops dmabuf_exp_ops = {
.attach = dmabuf_exp_ops_attach,
.detach = dmabuf_exp_ops_detach,
.map_dma_buf = dmabuf_exp_ops_map_dma_buf,
.unmap_dma_buf = dmabuf_exp_ops_unmap_dma_buf,
.release = dmabuf_exp_ops_release,
- .map = dmabuf_exp_ops_kmap,
- .unmap = dmabuf_exp_ops_kunmap,
- .mmap = dmabuf_exp_ops_mmap,
};
struct gntdev_dmabuf_export_args {
@@ -446,7 +422,7 @@
{
struct gntdev_grant_map *map;
- if (unlikely(count <= 0))
+ if (unlikely(gntdev_test_page_count(count)))
return ERR_PTR(-EINVAL);
if ((dmabuf_flags & GNTDEV_DMA_FLAG_WC) &&
@@ -459,11 +435,6 @@
if (!map)
return ERR_PTR(-ENOMEM);
- if (unlikely(gntdev_account_mapped_pages(count))) {
- pr_debug("can't map %d pages: over limit\n", count);
- gntdev_put_map(NULL, map);
- return ERR_PTR(-ENOMEM);
- }
return map;
}
@@ -661,7 +632,7 @@
/* Now convert sgt to array of pages and check for page validity. */
i = 0;
- for_each_sg_page(sgt->sgl, &sg_iter, sgt->nents, 0) {
+ for_each_sgtable_page(sgt, &sg_iter, 0) {
struct page *page = sg_page_iter_page(&sg_iter);
/*
* Check if page is valid: this can happen if we are given
@@ -753,6 +724,14 @@
return 0;
}
+static void dmabuf_imp_release_all(struct gntdev_dmabuf_priv *priv)
+{
+ struct gntdev_dmabuf *q, *gntdev_dmabuf;
+
+ list_for_each_entry_safe(gntdev_dmabuf, q, &priv->imp_list, next)
+ dmabuf_imp_release(priv, gntdev_dmabuf->fd);
+}
+
/* DMA buffer IOCTL support. */
long gntdev_ioctl_dmabuf_exp_from_refs(struct gntdev_priv *priv, int use_ptemod,
@@ -771,7 +750,7 @@
if (copy_from_user(&op, u, sizeof(op)) != 0)
return -EFAULT;
- if (unlikely(op.count <= 0))
+ if (unlikely(gntdev_test_page_count(op.count)))
return -EINVAL;
refs = kcalloc(op.count, sizeof(*refs), GFP_KERNEL);
@@ -818,7 +797,7 @@
if (copy_from_user(&op, u, sizeof(op)) != 0)
return -EFAULT;
- if (unlikely(op.count <= 0))
+ if (unlikely(gntdev_test_page_count(op.count)))
return -EINVAL;
gntdev_dmabuf = dmabuf_imp_to_refs(priv->dmabuf_priv,
@@ -870,5 +849,6 @@
void gntdev_dmabuf_fini(struct gntdev_dmabuf_priv *priv)
{
+ dmabuf_imp_release_all(priv);
kfree(priv);
}
--
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