Re: [PATCH v2] media: venus : hfi: add venus image info into smem

Bjorn Andersson
2021-03-30T03:59:57Z

On Fri 26 Mar 01:33 CDT 2021, Dikshita Agarwal wrote:

> Fill fw version info into smem to be printed as part of
> soc info.
>
> Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
>
> Changes since v1:
> adressed comments from stephen.
> removed unwanted code.
> ---
> drivers/media/platform/qcom/venus/hfi_msgs.c | 21 +++++++++++++++++++--
> 1 file changed, 19 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/hfi_msgs.c b/drivers/media/platform/qcom/venus/hfi_msgs.c
> index 06a1908..6b6d33c9 100644
> --- a/drivers/media/platform/qcom/venus/hfi_msgs.c
> +++ b/drivers/media/platform/qcom/venus/hfi_msgs.c
> @@ -6,6 +6,7 @@
> #include <linux/hash.h>
> #include <linux/list.h>
> #include <linux/slab.h>
> +#include <linux/soc/qcom/smem.h>
> #include <media/videobuf2-v4l2.h>
>
> #include "core.h"
> @@ -14,6 +15,10 @@
> #include "hfi_msgs.h"
> #include "hfi_parser.h"
>
> +#define SMEM_IMG_VER_TBL 469
> +#define VER_STR_SZ 128
> +#define SMEM_IMG_INDEX_VENUS 14 * 128

14 is the index, 128 is the element size, so this is now an "offset".

> +
> static void event_seq_changed(struct venus_core *core, struct venus_inst *inst,
> struct hfi_msg_event_notify_pkt *pkt)
> {
> @@ -239,15 +244,27 @@ static void
> sys_get_prop_image_version(struct device *dev,
> struct hfi_msg_sys_property_info_pkt *pkt)
> {
> + size_t smem_blk_sz = 0;

You shouldn't need to initialize smem_blk_sz if you check the return
value of qcom_smem_get() first.

> + u8 *smem_tbl_ptr;
> + u8 *img_ver;
> int req_bytes;
>
> req_bytes = pkt->hdr.size - sizeof(*pkt);
>
> - if (req_bytes < 128 || !pkt->data[1] || pkt->num_properties > 1)
> + if (req_bytes < VER_STR_SZ || !pkt->data[1] || pkt->num_properties > 1)
> /* bad packet */
> return;
>
> - dev_dbg(dev, VDBGL "F/W version: %s\n", (u8 *)&pkt->data[1]);
> + img_ver = (u8 *)&pkt->data[1];
> +
> + dev_dbg(dev, VDBGL "F/W version: %s\n", img_ver);
> +
> + smem_tbl_ptr = qcom_smem_get(QCOM_SMEM_HOST_ANY,
> + SMEM_IMG_VER_TBL, &smem_blk_sz);

80 chars is just a guideline and this looks prettier if you avoid the
line wrap. That said, if you pick shorter names for smem_tbl_ptr and
smem_blk_sz you probably even have to worry.

> + if ((SMEM_IMG_INDEX_VENUS + VER_STR_SZ) <= smem_blk_sz &&
> + smem_tbl_ptr)

In English you're trying to determine: "did qcom_smem_get() return a
valid pointer and is the item's size at least as big as we need".

So just write that in C:

if (smem_tbl_ptr && smem_blk_sz >= SMEM_IMG_INDEX_VENUS + VER_STR_SZ)

> + memcpy(smem_tbl_ptr + SMEM_IMG_INDEX_VENUS,
> + img_ver, VER_STR_SZ);

Again, please avoid the line wrap...

Regards,
Bjorn

> }
>
> static void hfi_sys_property_info(struct venus_core *core,
> --
> 2.7.4
>