linux-kernel - Re: [PATCH v4 RESEND 2/3] soc: qcom: fix QMI encoding/decoding for basic elements

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Message-ID: <aR17ZFbEJknzsdn-@FUE-ALEWI-WINX>
Date: Wed, 19 Nov 2025 09:10:12 +0100
From: Alexander Wilhelm <alexander.wilhelm@...termo.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 RESEND 2/3] soc: qcom: fix QMI encoding/decoding for
 basic elements

On Wed, Nov 19, 2025 at 10:03:41AM +0200, Dmitry Baryshkov wrote:
> On Tue, Nov 18, 2025 at 07:53:40AM +0100, Alexander Wilhelm wrote:
> > Extend the QMI byte encoding and decoding logic to support multiple basic
> > data type sizes (u8, u16, u32, u64) using existing macros. Ensure correct
> > handling of data sizes and proper byte order conversion on big-endian
> > platforms by consistently applying these macros during encoding and
> > decoding of basic elements.
> > 
> > Signed-off-by: Alexander Wilhelm <alexander.wilhelm@...termo.com>
> > ---
> >  drivers/soc/qcom/qmi_encdec.c | 46 +++++++++++++++++++++++------------
> >  1 file changed, 30 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/soc/qcom/qmi_encdec.c b/drivers/soc/qcom/qmi_encdec.c
> > index 1f9091458d72..90a48fa7ecf4 100644
> > --- a/drivers/soc/qcom/qmi_encdec.c
> > +++ b/drivers/soc/qcom/qmi_encdec.c
> > @@ -23,13 +23,6 @@
> >  	*p_length |= ((u8)*p_src) << 8; \
> >  } while (0)
> >  
> > -#define QMI_ENCDEC_ENCODE_N_BYTES(p_dst, p_src, size) \
> > -do { \
> > -	memcpy(p_dst, p_src, size); \
> > -	p_dst = (u8 *)p_dst + size; \
> > -	p_src = (u8 *)p_src + size; \
> > -} while (0)
> > -
> >  #define QMI_ENCDEC_ENCODE_U8(p_dst, p_src) \
> >  do { \
> >  	memcpy(p_dst, p_src, sizeof(u8)); \
> > @@ -58,13 +51,6 @@ do { \
> >  	p_src = (u8 *)p_src + sizeof(u64); \
> >  } while (0)
> >  
> > -#define QMI_ENCDEC_DECODE_N_BYTES(p_dst, p_src, size) \
> > -do { \
> > -	memcpy(p_dst, p_src, size); \
> > -	p_dst = (u8 *)p_dst + size; \
> > -	p_src = (u8 *)p_src + size; \
> > -} while (0)
> > -
> >  #define QMI_ENCDEC_DECODE_U8(p_dst, p_src) \
> >  do { \
> >  	memcpy(p_dst, p_src, sizeof(u8)); \
> > @@ -225,7 +211,21 @@ static int qmi_encode_basic_elem(void *buf_dst, const void *buf_src,
> >  	u32 i, rc = 0;
> >  
> >  	for (i = 0; i < elem_len; i++) {
> > -		QMI_ENCDEC_ENCODE_N_BYTES(buf_dst, buf_src, elem_size);
> > +		switch (elem_size) {
> > +		case sizeof(u8):
> > +			QMI_ENCDEC_ENCODE_U8(buf_dst, buf_src);
> > +			break;
> > +		case sizeof(u16):
> > +			QMI_ENCDEC_ENCODE_U16(buf_dst, buf_src);
> > +			break;
> > +		case sizeof(u32):
> > +			QMI_ENCDEC_ENCODE_U32(buf_dst, buf_src);
> > +			break;
> > +		case sizeof(u64):
> > +			QMI_ENCDEC_ENCODE_U64(buf_dst, buf_src);
> > +			break;
> 
> default: scream?

Okay, I'll fix that in the next version. What would be the recommended default
approach? The QMI protocol only uses the sizes mentioned above, and previously
the data was simple memcpy'ed.


Best regards
Alexander Wilhelm