diff options
| author | Tomer Tayar <ttayar@habana.ai> | 2020-07-09 16:17:48 +0300 |
|---|---|---|
| committer | Oded Gabbay <oded.gabbay@gmail.com> | 2020-09-22 18:49:54 +0300 |
| commit | ef6a0f6caa4a5dbfbb42b642e23fb06182798d30 (patch) | |
| tree | c55f87fb98e6845c184515282f2d169c3e9cb2dc /include | |
| parent | fa8641a14f2841e1712e554ebfa58f1ac7b7db1b (diff) | |
habanalabs: Add an option to map CB to device MMU
There are cases in which the device should access the host memory of a
CB through the device MMU, and thus this memory should be mapped.
The patch adds a flag to the CB IOCTL, in which a user can ask the
driver to perform the mapping when creating a CB.
The mapping is allowed only if a dedicated VA range was allocated for
the specific ASIC.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/misc/habanalabs.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h index d449f8a31ce6..9705b8adb60c 100644 --- a/include/uapi/misc/habanalabs.h +++ b/include/uapi/misc/habanalabs.h @@ -462,6 +462,9 @@ struct hl_info_args { /* 2MB minus 32 bytes for 2xMSG_PROT */ #define HL_MAX_CB_SIZE (0x200000 - 32) +/* Indicates whether the command buffer should be mapped to the device's MMU */ +#define HL_CB_FLAGS_MAP 0x1 + struct hl_cb_in { /* Handle of CB or 0 if we want to create one */ __u64 cb_handle; @@ -473,7 +476,8 @@ struct hl_cb_in { __u32 cb_size; /* Context ID - Currently not in use */ __u32 ctx_id; - __u32 pad; + /* HL_CB_FLAGS_* */ + __u32 flags; }; struct hl_cb_out { @@ -856,6 +860,12 @@ struct hl_debug_args { * When creating a new CB, the IOCTL returns a handle of it, and the user-space * process needs to use that handle to mmap the buffer so it can access them. * + * In some instances, the device must access the command buffer through the + * device's MMU, and thus its memory should be mapped. In these cases, user can + * indicate the driver that such a mapping is required. + * The resulting device virtual address will be used internally by the driver, + * and won't be returned to user. + * */ #define HL_IOCTL_CB \ _IOWR('H', 0x02, union hl_cb_args) |