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authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 19:21:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 19:21:14 -0800
commitd76e0a050e0f5e7c00e6d334f758178bbc16eb98 (patch)
tree9d0299f385da06f082fad6d206cc1351ee0de7f4 /drivers/misc
parent40b9672a2f071cbf931eb144997a21332bc0a747 (diff)
parentd1038084415c413b3c11c536f28fc5571ed00153 (diff)
Merge branch 'work.vmci' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vmci iov_iter updates from Al Viro: "Get rid of "is it an iovec or an entire array?" flags in vmxi - just use iov_iter. Simplifies the living hell out of that code..." * 'work.vmci' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: vmci: the same on the send side... vmci: simplify qp_dequeue_locked() vmci: get rid of qp_memcpy_from_queue() vmci: fix buf_size in case of iovec-based accesses
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/vmw_vmci/vmci_queue_pair.c179
1 files changed, 46 insertions, 133 deletions
diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index 8af5c2672f71..0339538c182d 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -129,23 +129,6 @@
* *_MEM state, and vice versa.
*/
-/*
- * VMCIMemcpy{To,From}QueueFunc() prototypes. Functions of these
- * types are passed around to enqueue and dequeue routines. Note that
- * often the functions passed are simply wrappers around memcpy
- * itself.
- *
- * Note: In order for the memcpy typedefs to be compatible with the VMKernel,
- * there's an unused last parameter for the hosted side. In
- * ESX, that parameter holds a buffer type.
- */
-typedef int vmci_memcpy_to_queue_func(struct vmci_queue *queue,
- u64 queue_offset, const void *src,
- size_t src_offset, size_t size);
-typedef int vmci_memcpy_from_queue_func(void *dest, size_t dest_offset,
- const struct vmci_queue *queue,
- u64 queue_offset, size_t size);
-
/* The Kernel specific component of the struct vmci_queue structure. */
struct vmci_queue_kern_if {
struct mutex __mutex; /* Protects the queue. */
@@ -351,11 +334,10 @@ static void *qp_alloc_queue(u64 size, u32 flags)
* by traversing the offset -> page translation structure for the queue.
* Assumes that offset + size does not wrap around in the queue.
*/
-static int __qp_memcpy_to_queue(struct vmci_queue *queue,
- u64 queue_offset,
- const void *src,
- size_t size,
- bool is_iovec)
+static int qp_memcpy_to_queue_iter(struct vmci_queue *queue,
+ u64 queue_offset,
+ struct iov_iter *from,
+ size_t size)
{
struct vmci_queue_kern_if *kernel_if = queue->kernel_if;
size_t bytes_copied = 0;
@@ -380,23 +362,12 @@ static int __qp_memcpy_to_queue(struct vmci_queue *queue,
else
to_copy = size - bytes_copied;
- if (is_iovec) {
- struct msghdr *msg = (struct msghdr *)src;
- int err;
-
- /* The iovec will track bytes_copied internally. */
- err = memcpy_from_msg((u8 *)va + page_offset,
- msg, to_copy);
- if (err != 0) {
- if (kernel_if->host)
- kunmap(kernel_if->u.h.page[page_index]);
- return VMCI_ERROR_INVALID_ARGS;
- }
- } else {
- memcpy((u8 *)va + page_offset,
- (u8 *)src + bytes_copied, to_copy);
+ if (!copy_from_iter_full((u8 *)va + page_offset, to_copy,
+ from)) {
+ if (kernel_if->host)
+ kunmap(kernel_if->u.h.page[page_index]);
+ return VMCI_ERROR_INVALID_ARGS;
}
-
bytes_copied += to_copy;
if (kernel_if->host)
kunmap(kernel_if->u.h.page[page_index]);
@@ -411,11 +382,9 @@ static int __qp_memcpy_to_queue(struct vmci_queue *queue,
* by traversing the offset -> page translation structure for the queue.
* Assumes that offset + size does not wrap around in the queue.
*/
-static int __qp_memcpy_from_queue(void *dest,
- const struct vmci_queue *queue,
- u64 queue_offset,
- size_t size,
- bool is_iovec)
+static int qp_memcpy_from_queue_iter(struct iov_iter *to,
+ const struct vmci_queue *queue,
+ u64 queue_offset, size_t size)
{
struct vmci_queue_kern_if *kernel_if = queue->kernel_if;
size_t bytes_copied = 0;
@@ -427,6 +396,7 @@ static int __qp_memcpy_from_queue(void *dest,
(queue_offset + bytes_copied) & (PAGE_SIZE - 1);
void *va;
size_t to_copy;
+ int err;
if (kernel_if->host)
va = kmap(kernel_if->u.h.page[page_index]);
@@ -440,23 +410,12 @@ static int __qp_memcpy_from_queue(void *dest,
else
to_copy = size - bytes_copied;
- if (is_iovec) {
- struct msghdr *msg = dest;
- int err;
-
- /* The iovec will track bytes_copied internally. */
- err = memcpy_to_msg(msg, (u8 *)va + page_offset,
- to_copy);
- if (err != 0) {
- if (kernel_if->host)
- kunmap(kernel_if->u.h.page[page_index]);
- return VMCI_ERROR_INVALID_ARGS;
- }
- } else {
- memcpy((u8 *)dest + bytes_copied,
- (u8 *)va + page_offset, to_copy);
+ err = copy_to_iter((u8 *)va + page_offset, to_copy, to);
+ if (err != to_copy) {
+ if (kernel_if->host)
+ kunmap(kernel_if->u.h.page[page_index]);
+ return VMCI_ERROR_INVALID_ARGS;
}
-
bytes_copied += to_copy;
if (kernel_if->host)
kunmap(kernel_if->u.h.page[page_index]);
@@ -569,54 +528,6 @@ static int qp_populate_ppn_set(u8 *call_buf, const struct ppn_set *ppn_set)
return VMCI_SUCCESS;
}
-static int qp_memcpy_to_queue(struct vmci_queue *queue,
- u64 queue_offset,
- const void *src, size_t src_offset, size_t size)
-{
- return __qp_memcpy_to_queue(queue, queue_offset,
- (u8 *)src + src_offset, size, false);
-}
-
-static int qp_memcpy_from_queue(void *dest,
- size_t dest_offset,
- const struct vmci_queue *queue,
- u64 queue_offset, size_t size)
-{
- return __qp_memcpy_from_queue((u8 *)dest + dest_offset,
- queue, queue_offset, size, false);
-}
-
-/*
- * Copies from a given iovec from a VMCI Queue.
- */
-static int qp_memcpy_to_queue_iov(struct vmci_queue *queue,
- u64 queue_offset,
- const void *msg,
- size_t src_offset, size_t size)
-{
-
- /*
- * We ignore src_offset because src is really a struct iovec * and will
- * maintain offset internally.
- */
- return __qp_memcpy_to_queue(queue, queue_offset, msg, size, true);
-}
-
-/*
- * Copies to a given iovec from a VMCI Queue.
- */
-static int qp_memcpy_from_queue_iov(void *dest,
- size_t dest_offset,
- const struct vmci_queue *queue,
- u64 queue_offset, size_t size)
-{
- /*
- * We ignore dest_offset because dest is really a struct iovec * and
- * will maintain offset internally.
- */
- return __qp_memcpy_from_queue(dest, queue, queue_offset, size, true);
-}
-
/*
* Allocates kernel VA space of specified size plus space for the queue
* and kernel interface. This is different from the guest queue allocator,
@@ -2629,12 +2540,11 @@ static bool qp_wait_for_ready_queue(struct vmci_qp *qpair)
static ssize_t qp_enqueue_locked(struct vmci_queue *produce_q,
struct vmci_queue *consume_q,
const u64 produce_q_size,
- const void *buf,
- size_t buf_size,
- vmci_memcpy_to_queue_func memcpy_to_queue)
+ struct iov_iter *from)
{
s64 free_space;
u64 tail;
+ size_t buf_size = iov_iter_count(from);
size_t written;
ssize_t result;
@@ -2654,15 +2564,15 @@ static ssize_t qp_enqueue_locked(struct vmci_queue *produce_q,
written = (size_t) (free_space > buf_size ? buf_size : free_space);
tail = vmci_q_header_producer_tail(produce_q->q_header);
if (likely(tail + written < produce_q_size)) {
- result = memcpy_to_queue(produce_q, tail, buf, 0, written);
+ result = qp_memcpy_to_queue_iter(produce_q, tail, from, written);
} else {
/* Tail pointer wraps around. */
const size_t tmp = (size_t) (produce_q_size - tail);
- result = memcpy_to_queue(produce_q, tail, buf, 0, tmp);
+ result = qp_memcpy_to_queue_iter(produce_q, tail, from, tmp);
if (result >= VMCI_SUCCESS)
- result = memcpy_to_queue(produce_q, 0, buf, tmp,
+ result = qp_memcpy_to_queue_iter(produce_q, 0, from,
written - tmp);
}
@@ -2690,11 +2600,10 @@ static ssize_t qp_enqueue_locked(struct vmci_queue *produce_q,
static ssize_t qp_dequeue_locked(struct vmci_queue *produce_q,
struct vmci_queue *consume_q,
const u64 consume_q_size,
- void *buf,
- size_t buf_size,
- vmci_memcpy_from_queue_func memcpy_from_queue,
+ struct iov_iter *to,
bool update_consumer)
{
+ size_t buf_size = iov_iter_count(to);
s64 buf_ready;
u64 head;
size_t read;
@@ -2716,15 +2625,15 @@ static ssize_t qp_dequeue_locked(struct vmci_queue *produce_q,
read = (size_t) (buf_ready > buf_size ? buf_size : buf_ready);
head = vmci_q_header_consumer_head(produce_q->q_header);
if (likely(head + read < consume_q_size)) {
- result = memcpy_from_queue(buf, 0, consume_q, head, read);
+ result = qp_memcpy_from_queue_iter(to, consume_q, head, read);
} else {
/* Head pointer wraps around. */
const size_t tmp = (size_t) (consume_q_size - head);
- result = memcpy_from_queue(buf, 0, consume_q, head, tmp);
+ result = qp_memcpy_from_queue_iter(to, consume_q, head, tmp);
if (result >= VMCI_SUCCESS)
- result = memcpy_from_queue(buf, tmp, consume_q, 0,
+ result = qp_memcpy_from_queue_iter(to, consume_q, 0,
read - tmp);
}
@@ -3118,18 +3027,21 @@ ssize_t vmci_qpair_enqueue(struct vmci_qp *qpair,
int buf_type)
{
ssize_t result;
+ struct iov_iter from;
+ struct kvec v = {.iov_base = (void *)buf, .iov_len = buf_size};
if (!qpair || !buf)
return VMCI_ERROR_INVALID_ARGS;
+ iov_iter_kvec(&from, WRITE | ITER_KVEC, &v, 1, buf_size);
+
qp_lock(qpair);
do {
result = qp_enqueue_locked(qpair->produce_q,
qpair->consume_q,
qpair->produce_q_size,
- buf, buf_size,
- qp_memcpy_to_queue);
+ &from);
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
!qp_wait_for_ready_queue(qpair))
@@ -3159,18 +3071,21 @@ ssize_t vmci_qpair_dequeue(struct vmci_qp *qpair,
int buf_type)
{
ssize_t result;
+ struct iov_iter to;
+ struct kvec v = {.iov_base = buf, .iov_len = buf_size};
if (!qpair || !buf)
return VMCI_ERROR_INVALID_ARGS;
+ iov_iter_kvec(&to, READ | ITER_KVEC, &v, 1, buf_size);
+
qp_lock(qpair);
do {
result = qp_dequeue_locked(qpair->produce_q,
qpair->consume_q,
qpair->consume_q_size,
- buf, buf_size,
- qp_memcpy_from_queue, true);
+ &to, true);
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
!qp_wait_for_ready_queue(qpair))
@@ -3200,19 +3115,22 @@ ssize_t vmci_qpair_peek(struct vmci_qp *qpair,
size_t buf_size,
int buf_type)
{
+ struct iov_iter to;
+ struct kvec v = {.iov_base = buf, .iov_len = buf_size};
ssize_t result;
if (!qpair || !buf)
return VMCI_ERROR_INVALID_ARGS;
+ iov_iter_kvec(&to, READ | ITER_KVEC, &v, 1, buf_size);
+
qp_lock(qpair);
do {
result = qp_dequeue_locked(qpair->produce_q,
qpair->consume_q,
qpair->consume_q_size,
- buf, buf_size,
- qp_memcpy_from_queue, false);
+ &to, false);
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
!qp_wait_for_ready_queue(qpair))
@@ -3253,8 +3171,7 @@ ssize_t vmci_qpair_enquev(struct vmci_qp *qpair,
result = qp_enqueue_locked(qpair->produce_q,
qpair->consume_q,
qpair->produce_q_size,
- msg, iov_size,
- qp_memcpy_to_queue_iov);
+ &msg->msg_iter);
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
!qp_wait_for_ready_queue(qpair))
@@ -3295,9 +3212,7 @@ ssize_t vmci_qpair_dequev(struct vmci_qp *qpair,
result = qp_dequeue_locked(qpair->produce_q,
qpair->consume_q,
qpair->consume_q_size,
- msg, iov_size,
- qp_memcpy_from_queue_iov,
- true);
+ &msg->msg_iter, true);
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
!qp_wait_for_ready_queue(qpair))
@@ -3339,9 +3254,7 @@ ssize_t vmci_qpair_peekv(struct vmci_qp *qpair,
result = qp_dequeue_locked(qpair->produce_q,
qpair->consume_q,
qpair->consume_q_size,
- msg, iov_size,
- qp_memcpy_from_queue_iov,
- false);
+ &msg->msg_iter, false);
if (result == VMCI_ERROR_QUEUEPAIR_NOT_READY &&
!qp_wait_for_ready_queue(qpair))

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