linux-kernel - [PATCH v1 04/14] tee: shm: add page accessor functions

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Message-Id: <1507923164-12796-5-git-send-email-volodymyr_babchuk@epam.com>
Date:   Fri, 13 Oct 2017 22:32:34 +0300
From:   Volodymyr Babchuk <volodymyr_babchuk@...m.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        tee-dev@...ts.linaro.org,
        Jens Wiklander <jens.wiklander@...aro.org>
Cc:     Volodymyr Babchuk <vlad.babchuk@...il.com>,
        volodymyr_babchuk@...m.com
Subject: [PATCH v1 04/14] tee: shm: add page accessor functions

From: Volodymyr Babchuk <vlad.babchuk@...il.com>

In order to register a shared buffer in TEE, we need accessor
function that return list of pages for that buffer.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@...il.com>
---

 * Removed check for validity of num_pages pointer. As Yury Norov pointed,
   this check can lead to mistakes in the future.

---
 include/linux/tee_drv.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
index 0d7f2a5..5489c38 100644
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -394,6 +394,19 @@ static inline size_t tee_shm_get_size(struct tee_shm *shm)
 }
 
 /**
+ * tee_shm_get_pages() - Get list of pages that hold shared buffer
+ * @shm:	Shared memory handle
+ * @num_pages:	Number of pages will be stored there
+ * @returns pointer to pages array
+ */
+static inline struct page **tee_shm_get_pages(struct tee_shm *shm,
+					      size_t *num_pages)
+{
+	*num_pages = shm->num_pages;
+	return shm->pages;
+}
+
+/**
  * tee_shm_get_page_offset() - Get shared buffer offset from page start
  * @shm:	Shared memory handle
  * @returns page offset of shared buffer
-- 
2.7.4