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Converts tee subsystem to use pin_user_pages() instead of get_user_pages() 

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Merge tag 'tee-pin-user-pages-for-5.10' of git://git.linaro.org/people/jens.wiklander/linux-tee into arm/drivers

Converts tee subsystem to use pin_user_pages() instead of get_user_pages()

* tag 'tee-pin-user-pages-for-5.10' of git://git.linaro.org/people/jens.wiklander/linux-tee:
  tee: convert get_user_pages() --> pin_user_pages()

Link: https://lore.kernel.org/r/20200825090715.GA2370775@jade
Signed-off-by: Olof Johansson <olof@lixom.net>
zero-sugar-mainline-defconfig
Olof Johansson 2020-08-27 02:04:31 -07:00
parent d4ee2d3500 4300cd6374
commit aa10e3cfdb
1 changed files with 19 additions and 13 deletions
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32
drivers/tee/tee_shm.c
View File

@ -12,6 +12,22 @@
#include <linux/uio.h>
#include "tee_private.h"
static void release_registered_pages(struct tee_shm *shm)
{
if (shm->pages) {
if (shm->flags & TEE_SHM_USER_MAPPED) {
unpin_user_pages(shm->pages, shm->num_pages);
} else {
size_t n;
for (n = 0; n < shm->num_pages; n++)
put_page(shm->pages[n]);
}
kfree(shm->pages);
}
}
static void tee_shm_release(struct tee_shm *shm)
{
struct tee_device *teedev = shm->ctx->teedev;
@ -32,17 +48,13 @@ static void tee_shm_release(struct tee_shm *shm)
poolm->ops->free(poolm, shm);
} else if (shm->flags & TEE_SHM_REGISTER) {
size_t n;
int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
if (rc)
dev_err(teedev->dev.parent,
"unregister shm %p failed: %d", shm, rc);
for (n = 0; n < shm->num_pages; n++)
put_page(shm->pages[n]);
kfree(shm->pages);
release_registered_pages(shm);
}
teedev_ctx_put(shm->ctx);
@ -228,7 +240,7 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
}
if (flags & TEE_SHM_USER_MAPPED) {
rc = get_user_pages_fast(start, num_pages, FOLL_WRITE,
rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE,
shm->pages);
} else {
struct kvec *kiov;
@ -292,18 +304,12 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
return shm;
err:
if (shm) {
size_t n;
if (shm->id >= 0) {
mutex_lock(&teedev->mutex);
idr_remove(&teedev->idr, shm->id);
mutex_unlock(&teedev->mutex);
}
if (shm->pages) {
for (n = 0; n < shm->num_pages; n++)
put_page(shm->pages[n]);
kfree(shm->pages);
}
release_registered_pages(shm);
}
kfree(shm);
teedev_ctx_put(ctx);