diff options
| author |   Sumit Garg <sumit.garg@linaro.org> | 2020-03-27 10:59:47 +0530 |
|---|---|---|
| committer |   Jens Wiklander <jens.wiklander@linaro.org> | 2020-04-20 15:49:56 +0200 |
| commit | 2a6ba3f794e892c37d67b8ebb19487ce105eabc2 (patch) | |
| tree | a6a990a7c99ead25bc8941332e294ee0418d486d /drivers/tee | |
| parent | Linux 5.7-rc2 (diff) | |
| download | wireguard-linux-2a6ba3f794e892c37d67b8ebb19487ce105eabc2.tar.xz wireguard-linux-2a6ba3f794e892c37d67b8ebb19487ce105eabc2.zip | |
tee: enable support to register kernel memory
Enable support to register kernel memory reference with TEE. This change
will allow TEE bus drivers to register memory references.
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
| -rw-r--r-- | drivers/tee/tee_shm.c | 28 |
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c index bd679b72bd05..c259271d4d5f 100644 --- a/drivers/tee/tee_shm.c +++ b/drivers/tee/tee_shm.c @@ -9,6 +9,7 @@ #include <linux/sched.h> #include <linux/slab.h> #include <linux/tee_drv.h> +#include <linux/uio.h> #include "tee_private.h" static void tee_shm_release(struct tee_shm *shm) @@ -185,14 +186,15 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, size_t length, u32 flags) { struct tee_device *teedev = ctx->teedev; - const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; + const u32 req_user_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; + const u32 req_kernel_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED; struct tee_shm *shm; void *ret; int rc; int num_pages; unsigned long start; - if (flags != req_flags) + if (flags != req_user_flags && flags != req_kernel_flags) return ERR_PTR(-ENOTSUPP); if (!tee_device_get(teedev)) @@ -226,7 +228,27 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, goto err; } - rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages); + if (flags & TEE_SHM_USER_MAPPED) { + rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, + shm->pages); + } else { + struct kvec *kiov; + int i; + + kiov = kcalloc(num_pages, sizeof(*kiov), GFP_KERNEL); + if (!kiov) { + ret = ERR_PTR(-ENOMEM); + goto err; + } + + for (i = 0; i < num_pages; i++) { + kiov[i].iov_base = (void *)(start + i * PAGE_SIZE); + kiov[i].iov_len = PAGE_SIZE; + } + + rc = get_kernel_pages(kiov, num_pages, 0, shm->pages); + kfree(kiov); + } if (rc > 0) shm->num_pages = rc; if (rc != num_pages) { |