HWMEM: Add hwmem_kmap and hwmem_kunmap

Add hwmem_kmap and hwmem_kunmap to the hwmem kernel api so that hwmem
buffers can be used from the kernel.

ST-Ericsson ID: AP 321641
ST-Ericsson FOSS-OUT ID: STETL-FOSS-OUT-10068

Change-Id: Ifd639eb9668d794004b0fbff91b3f403c3c335ad
Signed-off-by: Johan Mossberg <johan.xx.mossbergg@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/13672
Reviewed-by: Johan MOSSBERG <johan.xx.mossberg@stericsson.com>
Tested-by: Johan MOSSBERG <johan.xx.mossberg@stericsson.com>
Reviewed-by: QATOOLS
Reviewed-by: Pierre PEIFFER <pierre.peiffer@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/hwmem.h b/include/linux/hwmem.h
index c3ba179a83a..bc0a26a30a6 100644
--- a/include/linux/hwmem.h
+++ b/include/linux/hwmem.h
@@ -443,6 +443,26 @@ void hwmem_unpin(struct hwmem_alloc *alloc);
 int hwmem_mmap(struct hwmem_alloc *alloc, struct vm_area_struct *vma);
 
 /**
+ * @brief Map the buffer for use in the kernel.
+ *
+ * This function implicitly pins the buffer.
+ *
+ * @param alloc Buffer to be mapped.
+ *
+ * @return Pointer to buffer, or a negative error code.
+ */
+void *hwmem_kmap(struct hwmem_alloc *alloc);
+
+/**
+ * @brief Un-map a buffer previously mapped with hwmem_kmap.
+ *
+ * This function implicitly unpins the buffer.
+ *
+ * @param alloc Buffer to be un-mapped.
+ */
+void hwmem_kunmap(struct hwmem_alloc *alloc);
+
+/**
  * @brief Set access rights for buffer.
  *
  * @param alloc Buffer to set rights for.