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

[dikshita@xxxxxxxxxxxxxx]

Hi Bjorn,

Thanks for your review comments.
I have addressed all in the latest patch v3.
couldn't think of a shorter name for variables without losing the
readability so kept as it is.

Thanks,
Dikshita

On 2021-03-30 09:29, Bjorn Andersson wrote:
> 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@xxxxxxxxxxxxxx>
> >
> > 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