This is a note to let you know that I've just added the patch titled
tee: add tee_shm_alloc_kernel_buf()
to the 5.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tee-add-tee_shm_alloc_kernel_buf.patch
and it can be found in the queue-5.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From dc7019b7d0e188d4093b34bd0747ed0d668c63bf Mon Sep 17 00:00:00 2001
From: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Date: Mon, 14 Jun 2021 17:33:14 -0500
Subject: tee: add tee_shm_alloc_kernel_buf()
From: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
commit dc7019b7d0e188d4093b34bd0747ed0d668c63bf upstream.
Adds a new function tee_shm_alloc_kernel_buf() to allocate shared memory
from a kernel driver. This function can later be made more lightweight
by unnecessary dma-buf export.
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Tyler Hicks <tyhicks@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Sumit Garg <sumit.garg@xxxxxxxxxx>
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tee/tee_shm.c | 18 ++++++++++++++++++
include/linux/tee_drv.h | 1 +
2 files changed, 19 insertions(+)
--- a/drivers/tee/tee_shm.c
+++ b/drivers/tee/tee_shm.c
@@ -193,6 +193,24 @@ err_dev_put:
}
EXPORT_SYMBOL_GPL(tee_shm_alloc);
+/**
+ * tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
+ * @ctx: Context that allocates the shared memory
+ * @size: Requested size of shared memory
+ *
+ * The returned memory registered in secure world and is suitable to be
+ * passed as a memory buffer in parameter argument to
+ * tee_client_invoke_func(). The memory allocated is later freed with a
+ * call to tee_shm_free().
+ *
+ * @returns a pointer to 'struct tee_shm'
+ */
+struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
+{
+ return tee_shm_alloc(ctx, size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
+}
+EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
+
struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
size_t length, u32 flags)
{
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -332,6 +332,7 @@ void *tee_get_drvdata(struct tee_device
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags);
+struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
/**
* tee_shm_register() - Register shared memory buffer
Patches currently in stable-queue which might be from jens.wiklander@xxxxxxxxxx are
queue-5.13/optee-clear-stale-cache-entries-during-initialization.patch
queue-5.13/tee-correct-inappropriate-usage-of-tee_shm_dma_buf-flag.patch
queue-5.13/optee-fix-memory-leak-when-failing-to-register-shm-pages.patch
queue-5.13/optee-fix-tee-out-of-memory-failure-seen-during-kexec-reboot.patch
queue-5.13/tpm_ftpm_tee-free-and-unregister-tee-shared-memory-during-kexec.patch
queue-5.13/tee-add-tee_shm_alloc_kernel_buf.patch
queue-5.13/optee-refuse-to-load-the-driver-under-the-kdump-kernel.patch
