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io_uring: move mapping/allocation helpers to a separate file 

Move the related code from io_uring.c into memmap.c. No functional
changes in this patch, just cleaning it up a bit now that the full
transition is done.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-03-27 14:59:09 -06:00
parent 18595c0a58
commit f15ed8b4d0
7 changed files with 367 additions and 335 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
io_uring/Makefile
View File

@ -8,7 +8,8 @@ obj-$(CONFIG_IO_URING) += io_uring.o opdef.o kbuf.o rsrc.o notif.o \
xattr.o nop.o fs.o splice.o sync.o \
msg_ring.o advise.o openclose.o \
epoll.o statx.o timeout.o fdinfo.o \
cancel.o waitid.o register.o truncate.o
cancel.o waitid.o register.o \
truncate.o memmap.o
obj-$(CONFIG_IO_WQ) += io-wq.o
obj-$(CONFIG_FUTEX) += futex.o
obj-$(CONFIG_NET_RX_BUSY_POLL) += napi.o

327
io_uring/io_uring.c
View File

@ -95,6 +95,7 @@
#include "futex.h"
#include "napi.h"
#include "uring_cmd.h"
#include "memmap.h"
#include "timeout.h"
#include "poll.h"
@ -2597,111 +2598,6 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0;
}
void io_pages_unmap(void *ptr, struct page ***pages, unsigned short *npages,
bool put_pages)
{
bool do_vunmap = false;
if (!ptr)
return;
if (put_pages && *npages) {
struct page **to_free = *pages;
int i;
/*
* Only did vmap for the non-compound multiple page case.
* For the compound page, we just need to put the head.
*/
if (PageCompound(to_free[0]))
*npages = 1;
else if (*npages > 1)
do_vunmap = true;
for (i = 0; i < *npages; i++)
put_page(to_free[i]);
}
if (do_vunmap)
vunmap(ptr);
kvfree(*pages);
*pages = NULL;
*npages = 0;
}
static void io_pages_free(struct page ***pages, int npages)
{
struct page **page_array = *pages;
if (!page_array)
return;
unpin_user_pages(page_array, npages);
kvfree(page_array);
*pages = NULL;
}
struct page **io_pin_pages(unsigned long uaddr, unsigned long len, int *npages)
{
unsigned long start, end, nr_pages;
struct page **pages;
int ret;
end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
start = uaddr >> PAGE_SHIFT;
nr_pages = end - start;
if (WARN_ON_ONCE(!nr_pages))
return ERR_PTR(-EINVAL);
pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL);
if (!pages)
return ERR_PTR(-ENOMEM);
ret = pin_user_pages_fast(uaddr, nr_pages, FOLL_WRITE | FOLL_LONGTERM,
pages);
/* success, mapped all pages */
if (ret == nr_pages) {
*npages = nr_pages;
return pages;
}
/* partial map, or didn't map anything */
if (ret >= 0) {
/* if we did partial map, release any pages we did get */
if (ret)
unpin_user_pages(pages, ret);
ret = -EFAULT;
}
kvfree(pages);
return ERR_PTR(ret);
}
static void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
unsigned long uaddr, size_t size)
{
struct page **page_array;
unsigned int nr_pages;
void *page_addr;
*npages = 0;
if (uaddr & (PAGE_SIZE - 1) || !size)
return ERR_PTR(-EINVAL);
nr_pages = 0;
page_array = io_pin_pages(uaddr, size, &nr_pages);
if (IS_ERR(page_array))
return page_array;
page_addr = vmap(page_array, nr_pages, VM_MAP, PAGE_KERNEL);
if (page_addr) {
*pages = page_array;
*npages = nr_pages;
return page_addr;
}
io_pages_free(&page_array, nr_pages);
return ERR_PTR(-ENOMEM);
}
static void *io_rings_map(struct io_ring_ctx *ctx, unsigned long uaddr,
size_t size)
{
@ -2736,80 +2632,6 @@ static void io_rings_free(struct io_ring_ctx *ctx)
ctx->sq_sqes = NULL;
}
static void *io_mem_alloc_compound(struct page **pages, int nr_pages,
size_t size, gfp_t gfp)
{
struct page *page;
int i, order;
order = get_order(size);
if (order > MAX_PAGE_ORDER)
return ERR_PTR(-ENOMEM);
else if (order)
gfp |= __GFP_COMP;
page = alloc_pages(gfp, order);
if (!page)
return ERR_PTR(-ENOMEM);
for (i = 0; i < nr_pages; i++)
pages[i] = page + i;
return page_address(page);
}
static void *io_mem_alloc_single(struct page **pages, int nr_pages, size_t size,
gfp_t gfp)
{
void *ret;
int i;
for (i = 0; i < nr_pages; i++) {
pages[i] = alloc_page(gfp);
if (!pages[i])
goto err;
}
ret = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
if (ret)
return ret;
err:
while (i--)
put_page(pages[i]);
return ERR_PTR(-ENOMEM);
}
void *io_pages_map(struct page ***out_pages, unsigned short *npages,
size_t size)
{
gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
struct page **pages;
int nr_pages;
void *ret;
nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
pages = kvmalloc_array(nr_pages, sizeof(struct page *), gfp);
if (!pages)
return ERR_PTR(-ENOMEM);
ret = io_mem_alloc_compound(pages, nr_pages, size, gfp);
if (!IS_ERR(ret))
goto done;
ret = io_mem_alloc_single(pages, nr_pages, size, gfp);
if (!IS_ERR(ret)) {
done:
*out_pages = pages;
*npages = nr_pages;
return ret;
}
kvfree(pages);
*out_pages = NULL;
*npages = 0;
return ret;
}
static unsigned long rings_size(struct io_ring_ctx *ctx, unsigned int sq_entries,
unsigned int cq_entries, size_t *sq_offset)
{
@ -3370,149 +3192,6 @@ void __io_uring_cancel(bool cancel_all)
io_uring_cancel_generic(cancel_all, NULL);
}
static void *io_uring_validate_mmap_request(struct file *file,
loff_t pgoff, size_t sz)
{
struct io_ring_ctx *ctx = file->private_data;
loff_t offset = pgoff << PAGE_SHIFT;
switch ((pgoff << PAGE_SHIFT) & IORING_OFF_MMAP_MASK) {
case IORING_OFF_SQ_RING:
case IORING_OFF_CQ_RING:
/* Don't allow mmap if the ring was setup without it */
if (ctx->flags & IORING_SETUP_NO_MMAP)
return ERR_PTR(-EINVAL);
return ctx->rings;
case IORING_OFF_SQES:
/* Don't allow mmap if the ring was setup without it */
if (ctx->flags & IORING_SETUP_NO_MMAP)
return ERR_PTR(-EINVAL);
return ctx->sq_sqes;
case IORING_OFF_PBUF_RING: {
struct io_buffer_list *bl;
unsigned int bgid;
void *ptr;
bgid = (offset & ~IORING_OFF_MMAP_MASK) >> IORING_OFF_PBUF_SHIFT;
bl = io_pbuf_get_bl(ctx, bgid);
if (IS_ERR(bl))
return bl;
ptr = bl->buf_ring;
io_put_bl(ctx, bl);
return ptr;
}
}
return ERR_PTR(-EINVAL);
}
int io_uring_mmap_pages(struct io_ring_ctx *ctx, struct vm_area_struct *vma,
struct page **pages, int npages)
{
unsigned long nr_pages = npages;
vm_flags_set(vma, VM_DONTEXPAND);
return vm_insert_pages(vma, vma->vm_start, pages, &nr_pages);
}
#ifdef CONFIG_MMU
static __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
{
struct io_ring_ctx *ctx = file->private_data;
size_t sz = vma->vm_end - vma->vm_start;
long offset = vma->vm_pgoff << PAGE_SHIFT;
void *ptr;
ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz);
if (IS_ERR(ptr))
return PTR_ERR(ptr);
switch (offset & IORING_OFF_MMAP_MASK) {
case IORING_OFF_SQ_RING:
case IORING_OFF_CQ_RING:
return io_uring_mmap_pages(ctx, vma, ctx->ring_pages,
ctx->n_ring_pages);
case IORING_OFF_SQES:
return io_uring_mmap_pages(ctx, vma, ctx->sqe_pages,
ctx->n_sqe_pages);
case IORING_OFF_PBUF_RING:
return io_pbuf_mmap(file, vma);
}
return -EINVAL;
}
static unsigned long io_uring_mmu_get_unmapped_area(struct file *filp,
unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
void *ptr;
/*
* Do not allow to map to user-provided address to avoid breaking the
* aliasing rules. Userspace is not able to guess the offset address of
* kernel kmalloc()ed memory area.
*/
if (addr)
return -EINVAL;
ptr = io_uring_validate_mmap_request(filp, pgoff, len);
if (IS_ERR(ptr))
return -ENOMEM;
/*
* Some architectures have strong cache aliasing requirements.
* For such architectures we need a coherent mapping which aliases
* kernel memory *and* userspace memory. To achieve that:
* - use a NULL file pointer to reference physical memory, and
* - use the kernel virtual address of the shared io_uring context
* (instead of the userspace-provided address, which has to be 0UL
* anyway).
* - use the same pgoff which the get_unmapped_area() uses to
* calculate the page colouring.
* For architectures without such aliasing requirements, the
* architecture will return any suitable mapping because addr is 0.
*/
filp = NULL;
flags |= MAP_SHARED;
pgoff = 0; /* has been translated to ptr above */
#ifdef SHM_COLOUR
addr = (uintptr_t) ptr;
pgoff = addr >> PAGE_SHIFT;
#else
addr = 0UL;
#endif
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
#else /* !CONFIG_MMU */
static int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
{
return is_nommu_shared_mapping(vma->vm_flags) ? 0 : -EINVAL;
}
static unsigned int io_uring_nommu_mmap_capabilities(struct file *file)
{
return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE;
}
static unsigned long io_uring_nommu_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
void *ptr;
ptr = io_uring_validate_mmap_request(file, pgoff, len);
if (IS_ERR(ptr))
return PTR_ERR(ptr);
return (unsigned long) ptr;
}
#endif /* !CONFIG_MMU */
static int io_validate_ext_arg(unsigned flags, const void __user *argp, size_t argsz)
{
if (flags & IORING_ENTER_EXT_ARG) {
@ -3695,11 +3374,9 @@ out:
static const struct file_operations io_uring_fops = {
.release = io_uring_release,
.mmap = io_uring_mmap,
.get_unmapped_area = io_uring_get_unmapped_area,
#ifndef CONFIG_MMU
.get_unmapped_area = io_uring_nommu_get_unmapped_area,
.mmap_capabilities = io_uring_nommu_mmap_capabilities,
#else
.get_unmapped_area = io_uring_mmu_get_unmapped_area,
#endif
.poll = io_uring_poll,
#ifdef CONFIG_PROC_FS

9
io_uring/io_uring.h
View File

@ -69,10 +69,6 @@ bool io_post_aux_cqe(struct io_ring_ctx *ctx, u64 user_data, s32 res, u32 cflags
bool io_req_post_cqe(struct io_kiocb *req, s32 res, u32 cflags);
void __io_commit_cqring_flush(struct io_ring_ctx *ctx);
struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages);
int io_uring_mmap_pages(struct io_ring_ctx *ctx, struct vm_area_struct *vma,
struct page **pages, int npages);
struct file *io_file_get_normal(struct io_kiocb *req, int fd);
struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
unsigned issue_flags);
@ -109,11 +105,6 @@ bool __io_alloc_req_refill(struct io_ring_ctx *ctx);
bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
bool cancel_all);
void *io_pages_map(struct page ***out_pages, unsigned short *npages,
size_t size);
void io_pages_unmap(void *ptr, struct page ***pages, unsigned short *npages,
bool put_pages);
enum {
IO_EVENTFD_OP_SIGNAL_BIT,
IO_EVENTFD_OP_FREE_BIT,

1
io_uring/kbuf.c
View File

@ -15,6 +15,7 @@
#include "io_uring.h"
#include "opdef.h"
#include "kbuf.h"
#include "memmap.h"
#define IO_BUFFER_LIST_BUF_PER_PAGE (PAGE_SIZE / sizeof(struct io_uring_buf))

336
io_uring/memmap.c Normal file
View File

@ -0,0 +1,336 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/mman.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/io_uring.h>
#include <linux/io_uring_types.h>
#include <asm/shmparam.h>
#include "memmap.h"
#include "kbuf.h"
static void *io_mem_alloc_compound(struct page **pages, int nr_pages,
size_t size, gfp_t gfp)
{
struct page *page;
int i, order;
order = get_order(size);
if (order > MAX_PAGE_ORDER)
return ERR_PTR(-ENOMEM);
else if (order)
gfp |= __GFP_COMP;
page = alloc_pages(gfp, order);
if (!page)
return ERR_PTR(-ENOMEM);
for (i = 0; i < nr_pages; i++)
pages[i] = page + i;
return page_address(page);
}
static void *io_mem_alloc_single(struct page **pages, int nr_pages, size_t size,
gfp_t gfp)
{
void *ret;
int i;
for (i = 0; i < nr_pages; i++) {
pages[i] = alloc_page(gfp);
if (!pages[i])
goto err;
}
ret = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
if (ret)
return ret;
err:
while (i--)
put_page(pages[i]);
return ERR_PTR(-ENOMEM);
}
void *io_pages_map(struct page ***out_pages, unsigned short *npages,
size_t size)
{
gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO | __GFP_NOWARN;
struct page **pages;
int nr_pages;
void *ret;
nr_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
pages = kvmalloc_array(nr_pages, sizeof(struct page *), gfp);
if (!pages)
return ERR_PTR(-ENOMEM);
ret = io_mem_alloc_compound(pages, nr_pages, size, gfp);
if (!IS_ERR(ret))
goto done;
ret = io_mem_alloc_single(pages, nr_pages, size, gfp);
if (!IS_ERR(ret)) {
done:
*out_pages = pages;
*npages = nr_pages;
return ret;
}
kvfree(pages);
*out_pages = NULL;
*npages = 0;
return ret;
}
void io_pages_unmap(void *ptr, struct page ***pages, unsigned short *npages,
bool put_pages)
{
bool do_vunmap = false;
if (!ptr)
return;
if (put_pages && *npages) {
struct page **to_free = *pages;
int i;
/*
* Only did vmap for the non-compound multiple page case.
* For the compound page, we just need to put the head.
*/
if (PageCompound(to_free[0]))
*npages = 1;
else if (*npages > 1)
do_vunmap = true;
for (i = 0; i < *npages; i++)
put_page(to_free[i]);
}
if (do_vunmap)
vunmap(ptr);
kvfree(*pages);
*pages = NULL;
*npages = 0;
}
void io_pages_free(struct page ***pages, int npages)
{
struct page **page_array = *pages;
if (!page_array)
return;
unpin_user_pages(page_array, npages);
kvfree(page_array);
*pages = NULL;
}
struct page **io_pin_pages(unsigned long uaddr, unsigned long len, int *npages)
{
unsigned long start, end, nr_pages;
struct page **pages;
int ret;
end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
start = uaddr >> PAGE_SHIFT;
nr_pages = end - start;
if (WARN_ON_ONCE(!nr_pages))
return ERR_PTR(-EINVAL);
pages = kvmalloc_array(nr_pages, sizeof(struct page *), GFP_KERNEL);
if (!pages)
return ERR_PTR(-ENOMEM);
ret = pin_user_pages_fast(uaddr, nr_pages, FOLL_WRITE | FOLL_LONGTERM,
pages);
/* success, mapped all pages */
if (ret == nr_pages) {
*npages = nr_pages;
return pages;
}
/* partial map, or didn't map anything */
if (ret >= 0) {
/* if we did partial map, release any pages we did get */
if (ret)
unpin_user_pages(pages, ret);
ret = -EFAULT;
}
kvfree(pages);
return ERR_PTR(ret);
}
void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
unsigned long uaddr, size_t size)
{
struct page **page_array;
unsigned int nr_pages;
void *page_addr;
*npages = 0;
if (uaddr & (PAGE_SIZE - 1) || !size)
return ERR_PTR(-EINVAL);
nr_pages = 0;
page_array = io_pin_pages(uaddr, size, &nr_pages);
if (IS_ERR(page_array))
return page_array;
page_addr = vmap(page_array, nr_pages, VM_MAP, PAGE_KERNEL);
if (page_addr) {
*pages = page_array;
*npages = nr_pages;
return page_addr;
}
io_pages_free(&page_array, nr_pages);
return ERR_PTR(-ENOMEM);
}
static void *io_uring_validate_mmap_request(struct file *file, loff_t pgoff,
size_t sz)
{
struct io_ring_ctx *ctx = file->private_data;
loff_t offset = pgoff << PAGE_SHIFT;
switch ((pgoff << PAGE_SHIFT) & IORING_OFF_MMAP_MASK) {
case IORING_OFF_SQ_RING:
case IORING_OFF_CQ_RING:
/* Don't allow mmap if the ring was setup without it */
if (ctx->flags & IORING_SETUP_NO_MMAP)
return ERR_PTR(-EINVAL);
return ctx->rings;
case IORING_OFF_SQES:
/* Don't allow mmap if the ring was setup without it */
if (ctx->flags & IORING_SETUP_NO_MMAP)
return ERR_PTR(-EINVAL);
return ctx->sq_sqes;
case IORING_OFF_PBUF_RING: {
struct io_buffer_list *bl;
unsigned int bgid;
void *ptr;
bgid = (offset & ~IORING_OFF_MMAP_MASK) >> IORING_OFF_PBUF_SHIFT;
bl = io_pbuf_get_bl(ctx, bgid);
if (IS_ERR(bl))
return bl;
ptr = bl->buf_ring;
io_put_bl(ctx, bl);
return ptr;
}
}
return ERR_PTR(-EINVAL);
}
int io_uring_mmap_pages(struct io_ring_ctx *ctx, struct vm_area_struct *vma,
struct page **pages, int npages)
{
unsigned long nr_pages = npages;
vm_flags_set(vma, VM_DONTEXPAND);
return vm_insert_pages(vma, vma->vm_start, pages, &nr_pages);
}
#ifdef CONFIG_MMU
__cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
{
struct io_ring_ctx *ctx = file->private_data;
size_t sz = vma->vm_end - vma->vm_start;
long offset = vma->vm_pgoff << PAGE_SHIFT;
void *ptr;
ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz);
if (IS_ERR(ptr))
return PTR_ERR(ptr);
switch (offset & IORING_OFF_MMAP_MASK) {
case IORING_OFF_SQ_RING:
case IORING_OFF_CQ_RING:
return io_uring_mmap_pages(ctx, vma, ctx->ring_pages,
ctx->n_ring_pages);
case IORING_OFF_SQES:
return io_uring_mmap_pages(ctx, vma, ctx->sqe_pages,
ctx->n_sqe_pages);
case IORING_OFF_PBUF_RING:
return io_pbuf_mmap(file, vma);
}
return -EINVAL;
}
unsigned long io_uring_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
void *ptr;
/*
* Do not allow to map to user-provided address to avoid breaking the
* aliasing rules. Userspace is not able to guess the offset address of
* kernel kmalloc()ed memory area.
*/
if (addr)
return -EINVAL;
ptr = io_uring_validate_mmap_request(filp, pgoff, len);
if (IS_ERR(ptr))
return -ENOMEM;
/*
* Some architectures have strong cache aliasing requirements.
* For such architectures we need a coherent mapping which aliases
* kernel memory *and* userspace memory. To achieve that:
* - use a NULL file pointer to reference physical memory, and
* - use the kernel virtual address of the shared io_uring context
* (instead of the userspace-provided address, which has to be 0UL
* anyway).
* - use the same pgoff which the get_unmapped_area() uses to
* calculate the page colouring.
* For architectures without such aliasing requirements, the
* architecture will return any suitable mapping because addr is 0.
*/
filp = NULL;
flags |= MAP_SHARED;
pgoff = 0; /* has been translated to ptr above */
#ifdef SHM_COLOUR
addr = (uintptr_t) ptr;
pgoff = addr >> PAGE_SHIFT;
#else
addr = 0UL;
#endif
return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
}
#else /* !CONFIG_MMU */
int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
{
return is_nommu_shared_mapping(vma->vm_flags) ? 0 : -EINVAL;
}
unsigned int io_uring_nommu_mmap_capabilities(struct file *file)
{
return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE;
}
unsigned long io_uring_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
void *ptr;
ptr = io_uring_validate_mmap_request(file, pgoff, len);
if (IS_ERR(ptr))
return PTR_ERR(ptr);
return (unsigned long) ptr;
}
#endif /* !CONFIG_MMU */

25
io_uring/memmap.h Normal file
View File

@ -0,0 +1,25 @@
#ifndef IO_URING_MEMMAP_H
#define IO_URING_MEMMAP_H
struct page **io_pin_pages(unsigned long ubuf, unsigned long len, int *npages);
void io_pages_free(struct page ***pages, int npages);
int io_uring_mmap_pages(struct io_ring_ctx *ctx, struct vm_area_struct *vma,
struct page **pages, int npages);
void *io_pages_map(struct page ***out_pages, unsigned short *npages,
size_t size);
void io_pages_unmap(void *ptr, struct page ***pages, unsigned short *npages,
bool put_pages);
void *__io_uaddr_map(struct page ***pages, unsigned short *npages,
unsigned long uaddr, size_t size);
#ifndef CONFIG_MMU
unsigned int io_uring_nommu_mmap_capabilities(struct file *file);
#endif
unsigned long io_uring_get_unmapped_area(struct file *file, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags);
int io_uring_mmap(struct file *file, struct vm_area_struct *vma);
#endif

1
io_uring/rsrc.c
View File

@ -16,6 +16,7 @@
#include "alloc_cache.h"
#include "openclose.h"
#include "rsrc.h"
#include "memmap.h"
struct io_rsrc_update {
struct file *file;