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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 2018-07-20 12:01:47 +03:00 committed by Boris Ostrovsky
parent 975ef7ff81
commit 1d31456755
2 changed files with 131 additions and 91 deletions
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88
drivers/xen/gntdev-common.h Normal file
View File

@ -0,0 +1,88 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Common functionality of grant device.
*
* Copyright (c) 2006-2007, D G Murray.
* (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
* (c) 2018 Oleksandr Andrushchenko, EPAM Systems Inc.
*/
#ifndef _GNTDEV_COMMON_H
#define _GNTDEV_COMMON_H
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/mmu_notifier.h>
#include <linux/types.h>
struct gntdev_priv {
/* Maps with visible offsets in the file descriptor. */
struct list_head maps;
/*
* Maps that are not visible; will be freed on munmap.
* Only populated if populate_freeable_maps == 1
*/
struct list_head freeable_maps;
/* lock protects maps and freeable_maps. */
struct mutex lock;
struct mm_struct *mm;
struct mmu_notifier mn;
#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
/* Device for which DMA memory is allocated. */
struct device *dma_dev;
#endif
};
struct gntdev_unmap_notify {
int flags;
/* Address relative to the start of the gntdev_grant_map. */
int addr;
int event;
};
struct gntdev_grant_map {
struct list_head next;
struct vm_area_struct *vma;
int index;
int count;
int flags;
refcount_t users;
struct gntdev_unmap_notify notify;
struct ioctl_gntdev_grant_ref *grants;
struct gnttab_map_grant_ref *map_ops;
struct gnttab_unmap_grant_ref *unmap_ops;
struct gnttab_map_grant_ref *kmap_ops;
struct gnttab_unmap_grant_ref *kunmap_ops;
struct page **pages;
unsigned long pages_vm_start;
#ifdef CONFIG_XEN_GRANT_DMA_ALLOC
/*
* If dmabuf_vaddr is not NULL then this mapping is backed by DMA
* capable memory.
*/
struct device *dma_dev;
/* Flags used to create this DMA buffer: GNTDEV_DMA_FLAG_XXX. */
int dma_flags;
void *dma_vaddr;
dma_addr_t dma_bus_addr;
/* Needed to avoid allocation in gnttab_dma_free_pages(). */
xen_pfn_t *frames;
#endif
};
struct gntdev_grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count,
int dma_flags);
void gntdev_add_map(struct gntdev_priv *priv, struct gntdev_grant_map *add);
void gntdev_put_map(struct gntdev_priv *priv, struct gntdev_grant_map *map);
bool gntdev_account_mapped_pages(int count);
int gntdev_map_grant_pages(struct gntdev_grant_map *map);
#endif

134
drivers/xen/gntdev.c
View File

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