mirror of https://gitee.com/openkylin/linux.git
xen/gntdev: Make private routines/structures accessible
This is in preparation for adding support of DMA buffer functionality: make map/unmap related code and structures, used privately by gntdev, ready for dma-buf extension, which will re-use these. Rename corresponding structures as those become non-private to gntdev now. Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Oleksandr Andrushchenko
Boris Ostrovsky
parent
975ef7ff81
commit
1d31456755
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@ -0,0 +1,88 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common functionality of grant device.
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*
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* Copyright (c) 2006-2007, D G Murray.
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* (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
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* (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
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*/
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#ifndef _GNTDEV_COMMON_H
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#define _GNTDEV_COMMON_H
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/mmu_notifier.h>
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#include <linux/types.h>
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struct gntdev_priv {
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/* Maps with visible offsets in the file descriptor. */
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struct list_head maps;
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/*
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* Maps that are not visible; will be freed on munmap.
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* Only populated if populate_freeable_maps == 1
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*/
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struct list_head freeable_maps;
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/* lock protects maps and freeable_maps. */
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struct mutex lock;
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struct mm_struct *mm;
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struct mmu_notifier mn;
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#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
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/* Device for which DMA memory is allocated. */
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struct device *dma_dev;
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#endif
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};
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struct gntdev_unmap_notify {
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int flags;
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/* Address relative to the start of the gntdev_grant_map. */
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int addr;
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int event;
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};
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struct gntdev_grant_map {
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struct list_head next;
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struct vm_area_struct *vma;
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int index;
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int count;
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int flags;
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refcount_t users;
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struct gntdev_unmap_notify notify;
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struct ioctl_gntdev_grant_ref *grants;
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struct gnttab_map_grant_ref *map_ops;
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struct gnttab_unmap_grant_ref *unmap_ops;
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struct gnttab_map_grant_ref *kmap_ops;
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struct gnttab_unmap_grant_ref *kunmap_ops;
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struct page **pages;
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unsigned long pages_vm_start;
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#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
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/*
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* If dmabuf_vaddr is not NULL then this mapping is backed by DMA
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* capable memory.
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*/
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struct device *dma_dev;
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/* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
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int dma_flags;
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void *dma_vaddr;
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dma_addr_t dma_bus_addr;
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/* Needed to avoid allocation in gnttab_dma_free_pages(). */
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xen_pfn_t *frames;
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#endif
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};
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struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
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int dma_flags);
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void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
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void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
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bool gntdev_account_mapped_pages(int count);
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int gntdev_map_grant_pages(struct gntdev_grant_map *map);
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#endif
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@ -6,6 +6,7 @@
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*
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* Copyright (c) 2006-2007, D G Murray.
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* (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
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* (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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@ -26,10 +27,6 @@
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/mmu_notifier.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/sched.h>
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#include <linux/sched/mm.h>
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@ -50,6 +47,8 @@
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include "gntdev-common.h"
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Derek G. Murray <Derek.Murray@cl.cam.ac.uk>, "
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"Gerd Hoffmann <kraxel@redhat.com>");
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@ -65,73 +64,23 @@ static atomic_t pages_mapped = ATOMIC_INIT(0);
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static int use_ptemod;
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#define populate_freeable_maps use_ptemod
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struct gntdev_priv {
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/* maps with visible offsets in the file descriptor */
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struct list_head maps;
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/* maps that are not visible; will be freed on munmap.
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* Only populated if populate_freeable_maps == 1 */
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struct list_head freeable_maps;
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/* lock protects maps and freeable_maps */
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struct mutex lock;
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struct mm_struct *mm;
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struct mmu_notifier mn;
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#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
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/* Device for which DMA memory is allocated. */
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struct device *dma_dev;
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#endif
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};
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struct unmap_notify {
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int flags;
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/* Address relative to the start of the grant_map */
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int addr;
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int event;
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};
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struct grant_map {
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struct list_head next;
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struct vm_area_struct *vma;
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int index;
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int count;
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int flags;
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refcount_t users;
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struct unmap_notify notify;
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struct ioctl_gntdev_grant_ref *grants;
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struct gnttab_map_grant_ref *map_ops;
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struct gnttab_unmap_grant_ref *unmap_ops;
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struct gnttab_map_grant_ref *kmap_ops;
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struct gnttab_unmap_grant_ref *kunmap_ops;
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struct page **pages;
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unsigned long pages_vm_start;
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#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
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/*
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* If dmabuf_vaddr is not NULL then this mapping is backed by DMA
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* capable memory.
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*/
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struct device *dma_dev;
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/* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
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int dma_flags;
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void *dma_vaddr;
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dma_addr_t dma_bus_addr;
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/* Needed to avoid allocation in gnttab_dma_free_pages(). */
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xen_pfn_t *frames;
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#endif
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};
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static int unmap_grant_pages(struct grant_map *map, int offset, int pages);
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static int unmap_grant_pages(struct gntdev_grant_map *map,
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int offset, int pages);
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static struct miscdevice gntdev_miscdev;
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/* ------------------------------------------------------------------ */
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bool gntdev_account_mapped_pages(int count)
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{
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return atomic_add_return(count, &pages_mapped) > limit;
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}
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static void gntdev_print_maps(struct gntdev_priv *priv,
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char *text, int text_index)
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{
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#ifdef DEBUG
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struct grant_map *map;
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struct gntdev_grant_map *map;
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pr_debug("%s: maps list (priv %p)\n", __func__, priv);
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list_for_each_entry(map, &priv->maps, next)
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@ -141,7 +90,7 @@ static void gntdev_print_maps(struct gntdev_priv *priv,
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#endif
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}
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static void gntdev_free_map(struct grant_map *map)
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static void gntdev_free_map(struct gntdev_grant_map *map)
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{
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if (map == NULL)
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return;
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@ -176,13 +125,13 @@ static void gntdev_free_map(struct grant_map *map)
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kfree(map);
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}
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static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
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struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
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int dma_flags)
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{
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struct grant_map *add;
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struct gntdev_grant_map *add;
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int i;
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add = kzalloc(sizeof(struct grant_map), GFP_KERNEL);
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add = kzalloc(sizeof(*add), GFP_KERNEL);
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if (NULL == add)
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return NULL;
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@ -252,9 +201,9 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
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return NULL;
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}
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static void gntdev_add_map(struct gntdev_priv *priv, struct grant_map *add)
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void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add)
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{
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struct grant_map *map;
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struct gntdev_grant_map *map;
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list_for_each_entry(map, &priv->maps, next) {
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if (add->index + add->count < map->index) {
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@ -269,10 +218,10 @@ static void gntdev_add_map(struct gntdev_priv *priv, struct grant_map *add)
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gntdev_print_maps(priv, "[new]", add->index);
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}
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static struct grant_map *gntdev_find_map_index(struct gntdev_priv *priv,
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int index, int count)
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static struct gntdev_grant_map *gntdev_find_map_index(struct gntdev_priv *priv,
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int index, int count)
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{
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struct grant_map *map;
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struct gntdev_grant_map *map;
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list_for_each_entry(map, &priv->maps, next) {
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if (map->index != index)
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@ -284,7 +233,7 @@ static struct grant_map *gntdev_find_map_index(struct gntdev_priv *priv,
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return NULL;
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}
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static void gntdev_put_map(struct gntdev_priv *priv, struct grant_map *map)
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void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map)
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{
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if (!map)
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return;
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@ -315,7 +264,7 @@ static void gntdev_put_map(struct gntdev_priv *priv, struct grant_map *map)
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static int find_grant_ptes(pte_t *pte, pgtable_t token,
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unsigned long addr, void *data)
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{
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struct grant_map *map = data;
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struct gntdev_grant_map *map = data;
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unsigned int pgnr = (addr - map->vma->vm_start) >> PAGE_SHIFT;
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int flags = map->flags | GNTMAP_application_map | GNTMAP_contains_pte;
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u64 pte_maddr;
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@ -348,7 +297,7 @@ static int set_grant_ptes_as_special(pte_t *pte, pgtable_t token,
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}
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#endif
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static int map_grant_pages(struct grant_map *map)
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int gntdev_map_grant_pages(struct gntdev_grant_map *map)
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{
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int i, err = 0;
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@ -413,7 +362,8 @@ static int map_grant_pages(struct grant_map *map)
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return err;
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}
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static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
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static int __unmap_grant_pages(struct gntdev_grant_map *map, int offset,
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int pages)
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{
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int i, err = 0;
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struct gntab_unmap_queue_data unmap_data;
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@ -448,7 +398,8 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
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return err;
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}
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static int unmap_grant_pages(struct grant_map *map, int offset, int pages)
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static int unmap_grant_pages(struct gntdev_grant_map *map, int offset,
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int pages)
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{
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int range, err = 0;
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@ -480,7 +431,7 @@ static int unmap_grant_pages(struct grant_map *map, int offset, int pages)
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static void gntdev_vma_open(struct vm_area_struct *vma)
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{
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struct grant_map *map = vma->vm_private_data;
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struct gntdev_grant_map *map = vma->vm_private_data;
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pr_debug("gntdev_vma_open %p\n", vma);
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refcount_inc(&map->users);
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@ -488,7 +439,7 @@ static void gntdev_vma_open(struct vm_area_struct *vma)
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static void gntdev_vma_close(struct vm_area_struct *vma)
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{
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struct grant_map *map = vma->vm_private_data;
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struct gntdev_grant_map *map = vma->vm_private_data;
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struct file *file = vma->vm_file;
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struct gntdev_priv *priv = file->private_data;
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@ -512,7 +463,7 @@ static void gntdev_vma_close(struct vm_area_struct *vma)
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static struct page *gntdev_vma_find_special_page(struct vm_area_struct *vma,
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unsigned long addr)
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{
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struct grant_map *map = vma->vm_private_data;
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struct gntdev_grant_map *map = vma->vm_private_data;
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return map->pages[(addr - map->pages_vm_start) >> PAGE_SHIFT];
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}
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@ -525,7 +476,7 @@ static const struct vm_operations_struct gntdev_vmops = {
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/* ------------------------------------------------------------------ */
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static void unmap_if_in_range(struct grant_map *map,
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static void unmap_if_in_range(struct gntdev_grant_map *map,
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unsigned long start, unsigned long end)
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{
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unsigned long mstart, mend;
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@ -554,7 +505,7 @@ static void mn_invl_range_start(struct mmu_notifier *mn,
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unsigned long start, unsigned long end)
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{
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struct gntdev_priv *priv = container_of(mn, struct gntdev_priv, mn);
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struct grant_map *map;
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struct gntdev_grant_map *map;
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mutex_lock(&priv->lock);
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list_for_each_entry(map, &priv->maps, next) {
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@ -570,7 +521,7 @@ static void mn_release(struct mmu_notifier *mn,
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struct mm_struct *mm)
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{
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struct gntdev_priv *priv = container_of(mn, struct gntdev_priv, mn);
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struct grant_map *map;
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struct gntdev_grant_map *map;
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int err;
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mutex_lock(&priv->lock);
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@ -651,13 +602,14 @@ static int gntdev_open(struct inode *inode, struct file *flip)
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static int gntdev_release(struct inode *inode, struct file *flip)
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{
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struct gntdev_priv *priv = flip->private_data;
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struct grant_map *map;
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struct gntdev_grant_map *map;
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pr_debug("priv %p\n", priv);
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mutex_lock(&priv->lock);
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while (!list_empty(&priv->maps)) {
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map = list_entry(priv->maps.next, struct grant_map, next);
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map = list_entry(priv->maps.next,
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struct gntdev_grant_map, next);
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list_del(&map->next);
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gntdev_put_map(NULL /* already removed */, map);
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}
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@ -674,7 +626,7 @@ static long gntdev_ioctl_map_grant_ref(struct gntdev_priv *priv,
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struct ioctl_gntdev_map_grant_ref __user *u)
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{
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struct ioctl_gntdev_map_grant_ref op;
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struct grant_map *map;
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struct gntdev_grant_map *map;
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int err;
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if (copy_from_user(&op, u, sizeof(op)) != 0)
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@ -688,7 +640,7 @@ static long gntdev_ioctl_map_grant_ref(struct gntdev_priv *priv,
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if (!map)
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return err;
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if (unlikely(atomic_add_return(op.count, &pages_mapped) > limit)) {
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if (unlikely(gntdev_account_mapped_pages(op.count))) {
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pr_debug("can't map: over limit\n");
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gntdev_put_map(NULL, map);
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return err;
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@ -715,7 +667,7 @@ static long gntdev_ioctl_unmap_grant_ref(struct gntdev_priv *priv,
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struct ioctl_gntdev_unmap_grant_ref __user *u)
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{
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struct ioctl_gntdev_unmap_grant_ref op;
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struct grant_map *map;
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struct gntdev_grant_map *map;
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int err = -ENOENT;
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if (copy_from_user(&op, u, sizeof(op)) != 0)
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@ -741,7 +693,7 @@ static long gntdev_ioctl_get_offset_for_vaddr(struct gntdev_priv *priv,
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{
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struct ioctl_gntdev_get_offset_for_vaddr op;
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struct vm_area_struct *vma;
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struct grant_map *map;
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struct gntdev_grant_map *map;
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int rv = -EINVAL;
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if (copy_from_user(&op, u, sizeof(op)) != 0)
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@ -772,7 +724,7 @@ static long gntdev_ioctl_get_offset_for_vaddr(struct gntdev_priv *priv,
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static long gntdev_ioctl_notify(struct gntdev_priv *priv, void __user *u)
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{
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struct ioctl_gntdev_unmap_notify op;
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struct grant_map *map;
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struct gntdev_grant_map *map;
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int rc;
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int out_flags;
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unsigned int out_event;
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@ -1070,7 +1022,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
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struct gntdev_priv *priv = flip->private_data;
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int index = vma->vm_pgoff;
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||||
int count = vma_pages(vma);
|
||||
struct grant_map *map;
|
||||
struct gntdev_grant_map *map;
|
||||
int i, err = -EINVAL;
|
||||
|
||||
if ((vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_SHARED))
|
||||
|
|
@ -1127,7 +1079,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
|
|||
}
|
||||
}
|
||||
|
||||
err = map_grant_pages(map);
|
||||
err = gntdev_map_grant_pages(map);
|
||||
if (err)
|
||||
goto out_put_map;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue