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io_uring/kbuf: get rid of lower BGID lists

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Just rely on the xarray for any kind of bgid. This simplifies things, and
it really doesn't bring us much, if anything.

Cc: stable@vger.kernel.org # v6.4+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2024-03-14 10:45:07 -06:00
parent 73eaa2b583
commit 09ab7eff38
3 changed files with 8 additions and 65 deletions
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1
include/linux/io_uring_types.h
View file

@ -294,7 +294,6 @@ struct io_ring_ctx {
struct io_submit_state submit_state;
struct io_buffer_list *io_bl;
struct xarray io_bl_xa;
struct io_hash_table cancel_table_locked;

2
io_uring/io_uring.c
View file

@ -351,7 +351,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
err:
kfree(ctx->cancel_table.hbs);
kfree(ctx->cancel_table_locked.hbs);
kfree(ctx->io_bl);
xa_destroy(&ctx->io_bl_xa);
kfree(ctx);
return NULL;
@ -2932,7 +2931,6 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
io_napi_free(ctx);
kfree(ctx->cancel_table.hbs);
kfree(ctx->cancel_table_locked.hbs);
kfree(ctx->io_bl);
xa_destroy(&ctx->io_bl_xa);
kfree(ctx);
}

70
io_uring/kbuf.c
View file

@ -17,8 +17,6 @@
#define IO_BUFFER_LIST_BUF_PER_PAGE (PAGE_SIZE / sizeof(struct io_uring_buf))
#define BGID_ARRAY 64
/* BIDs are addressed by a 16-bit field in a CQE */
#define MAX_BIDS_PER_BGID (1 << 16)
@ -40,13 +38,9 @@ struct io_buf_free {
int inuse;
};
static struct io_buffer_list *__io_buffer_get_list(struct io_ring_ctx *ctx,
struct io_buffer_list *bl,
unsigned int bgid)
static inline struct io_buffer_list *__io_buffer_get_list(struct io_ring_ctx *ctx,
unsigned int bgid)
{
if (bl && bgid < BGID_ARRAY)
return &bl[bgid];
return xa_load(&ctx->io_bl_xa, bgid);
}
@ -55,7 +49,7 @@ static inline struct io_buffer_list *io_buffer_get_list(struct io_ring_ctx *ctx,
{
lockdep_assert_held(&ctx->uring_lock);
return __io_buffer_get_list(ctx, ctx->io_bl, bgid);
return __io_buffer_get_list(ctx, bgid);
}
static int io_buffer_add_list(struct io_ring_ctx *ctx,
@ -68,10 +62,6 @@ static int io_buffer_add_list(struct io_ring_ctx *ctx,
*/
bl->bgid = bgid;
smp_store_release(&bl->is_ready, 1);
if (bgid < BGID_ARRAY)
return 0;
return xa_err(xa_store(&ctx->io_bl_xa, bgid, bl, GFP_KERNEL));
}
@ -208,24 +198,6 @@ void __user *io_buffer_select(struct io_kiocb *req, size_t *len,
return ret;
}
static __cold int io_init_bl_list(struct io_ring_ctx *ctx)
{
struct io_buffer_list *bl;
int i;
bl = kcalloc(BGID_ARRAY, sizeof(struct io_buffer_list), GFP_KERNEL);
if (!bl)
return -ENOMEM;
for (i = 0; i < BGID_ARRAY; i++) {
INIT_LIST_HEAD(&bl[i].buf_list);
bl[i].bgid = i;
}
smp_store_release(&ctx->io_bl, bl);
return 0;
}
/*
* Mark the given mapped range as free for reuse
*/
@ -300,13 +272,6 @@ void io_destroy_buffers(struct io_ring_ctx *ctx)
struct list_head *item, *tmp;
struct io_buffer *buf;
unsigned long index;
int i;
for (i = 0; i < BGID_ARRAY; i++) {
if (!ctx->io_bl)
break;
__io_remove_buffers(ctx, &ctx->io_bl[i], -1U);
}
xa_for_each(&ctx->io_bl_xa, index, bl) {
xa_erase(&ctx->io_bl_xa, bl->bgid);
@ -489,12 +454,6 @@ int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
io_ring_submit_lock(ctx, issue_flags);
if (unlikely(p->bgid < BGID_ARRAY && !ctx->io_bl)) {
ret = io_init_bl_list(ctx);
if (ret)
goto err;
}
bl = io_buffer_get_list(ctx, p->bgid);
if (unlikely(!bl)) {
bl = kzalloc(sizeof(*bl), GFP_KERNEL_ACCOUNT);
@ -507,14 +466,9 @@ int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
if (ret) {
/*
* Doesn't need rcu free as it was never visible, but
* let's keep it consistent throughout. Also can't
* be a lower indexed array group, as adding one
* where lookup failed cannot happen.
* let's keep it consistent throughout.
*/
if (p->bgid >= BGID_ARRAY)
kfree_rcu(bl, rcu);
else
WARN_ON_ONCE(1);
kfree_rcu(bl, rcu);
goto err;
}
}
@ -679,12 +633,6 @@ int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
if (reg.ring_entries >= 65536)
return -EINVAL;
if (unlikely(reg.bgid < BGID_ARRAY && !ctx->io_bl)) {
int ret = io_init_bl_list(ctx);
if (ret)
return ret;
}
bl = io_buffer_get_list(ctx, reg.bgid);
if (bl) {
/* if mapped buffer ring OR classic exists, don't allow */
@ -734,10 +682,8 @@ int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg)
return -EINVAL;
__io_remove_buffers(ctx, bl, -1U);
if (bl->bgid >= BGID_ARRAY) {
xa_erase(&ctx->io_bl_xa, bl->bgid);
kfree_rcu(bl, rcu);
}
xa_erase(&ctx->io_bl_xa, bl->bgid);
kfree_rcu(bl, rcu);
return 0;
}
@ -771,7 +717,7 @@ void *io_pbuf_get_address(struct io_ring_ctx *ctx, unsigned long bgid)
{
struct io_buffer_list *bl;
bl = __io_buffer_get_list(ctx, smp_load_acquire(&ctx->io_bl), bgid);
bl = __io_buffer_get_list(ctx, bgid);
if (!bl || !bl->is_mmap)
return NULL;