video: tegra: nvmap: add labels for allocation tags

Defines NVMAP_IOC_SET_TAG_LABEL to assign a human-readeable
label to a given allocation tag. Modified debugfs to display
this label for handle allocations.

bug 1741464

Change-Id: I890a084d271ff7a7da25bd95f515c0131acade7d
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1120018
GVS: Gerrit_Virtual_Submit
Reviewed-by: Krishna Reddy <vdumpa@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/nvmap.h b/include/linux/nvmap.h
index 6bc647493..d551f992d 100644
--- a/include/linux/nvmap.h
+++ b/include/linux/nvmap.h
@@ -280,6 +280,13 @@ struct nvmap_debugfs_handles_entry {
         __u64 mapped_size;
 };
 
+struct nvmap_set_tag_label {
+        __u32 tag;
+        __u32 len;              /* in: label length
+                                   out: number of characters copied */
+        __u64 addr;             /* in: pointer to label or NULL to remove */
+};
+
 #define NVMAP_IOC_MAGIC 'N'
 
 /* Creates a new memory handle. On input, the argument is the size of the new
@@ -362,6 +369,9 @@ struct nvmap_debugfs_handles_entry {
 
 #define NVMAP_IOC_GUP_TEST _IOWR(NVMAP_IOC_MAGIC, 23, struct nvmap_gup_test)
 
+/* Define a label for allocation tag */
+#define NVMAP_IOC_SET_TAG_LABEL _IOW(NVMAP_IOC_MAGIC, 24, struct nvmap_set_tag_label)
+
 /* START of T124 IOCTLS */
 /* Actually allocates memory for the specified handle, with kind */
 #define NVMAP_IOC_ALLOC_KIND _IOW(NVMAP_IOC_MAGIC, 100, struct nvmap_alloc_kind_handle)