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authorSumit Garg <sumit.garg@linaro.org>2020-03-27 08:29:47 +0300
committerJens Wiklander <jens.wiklander@linaro.org>2020-04-20 16:49:56 +0300
commit2a6ba3f794e892c37d67b8ebb19487ce105eabc2 (patch)
treea6a990a7c99ead25bc8941332e294ee0418d486d /drivers/tee
parentae83d0b416db002fe95601e7f97f64b59514d936 (diff)
downloadlinux-2a6ba3f794e892c37d67b8ebb19487ce105eabc2.tar.xz
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.c28
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) {