linux-kernel - RE: [PATCH v10 4/5] QE/CPM: move muram management functions to qe

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Date:	Tue, 22 Sep 2015 02:23:02 +0000
From:	Zhao Qiang <qiang.zhao@...escale.com>
To:	Scott Wood <scottwood@...escale.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"lauraa@...eaurora.org" <lauraa@...eaurora.org>,
	Xiaobo Xie <X.Xie@...escale.com>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	Li Leo <LeoLi@...escale.com>,
	"paulus@...ba.org" <paulus@...ba.org>
Subject: RE: [PATCH v10 4/5] QE/CPM: move muram management functions to
 qe_common

On Tue, Sep 22, 2015 at 06:54AM +0800, Wood Scott-B07421 wrote:
> -----Original Message-----
> From: Wood Scott-B07421
> Sent: Tuesday, September 22, 2015 6:54 AM
> To: Zhao Qiang-B45475
> Cc: linux-kernel@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org;
> lauraa@...eaurora.org; Xie Xiaobo-R63061; benh@...nel.crashing.org; Li
> Yang-Leo-R58472; paulus@...ba.org
> Subject: Re: [PATCH v10 4/5] QE/CPM: move muram management functions to
> qe_common
> 
> On Fri, Sep 18, 2015 at 03:15:20PM +0800, Zhao Qiang wrote:
> > QE and CPM have the same muram, they use the same management
> > functions. Now QE support both ARM and PowerPC, it is necessary to
> > move QE to "driver/soc", so move the muram management functions from
> > cpm_common to qe_common for preparing to move QE code to "driver/soc"
> >
> > Signed-off-by: Zhao Qiang <qiang.zhao@...escale.com>
> > ---
> > Changes for v2:
> > 	- no changes
> > Changes for v3:
> > 	- no changes
> > Changes for v4:
> > 	- no changes
> > Changes for v5:
> > 	- no changes
> > Changes for v6:
> > 	- using genalloc instead rheap to manage QE MURAM
> > 	- remove qe_reset from platform file, using
> > 	- subsys_initcall to call qe_init function.
> 
> Why is the init change in the same patch as moving the muram code?
> 
> > Changes for v7:
> > 	- move this patch from 3/3 to 2/3
> > 	- convert cpm with genalloc
> > 	- check for gen_pool allocation failure Changes for v8:
> > 	- rebase
> > 	- move BD_SC_* macro instead of copy
> > Changes for v9:
> > 	- doesn't modify CPM, add a new patch to modify.
> > 	- rebase
> > Changes for v10:
> > 	- rebase
> >
> >  arch/powerpc/include/asm/cpm.h            |  59 --------
> >  arch/powerpc/include/asm/qe.h             |  51 ++++++-
> >  arch/powerpc/platforms/83xx/km83xx.c      |   2 -
> >  arch/powerpc/platforms/83xx/mpc832x_mds.c |   2 -
> >  arch/powerpc/platforms/83xx/mpc832x_rdb.c |   2 -
> >  arch/powerpc/platforms/83xx/mpc836x_mds.c |   2 -
> >  arch/powerpc/platforms/83xx/mpc836x_rdk.c |   3 -
> >  arch/powerpc/platforms/85xx/common.c      |   1 -
> >  arch/powerpc/sysdev/cpm_common.c          | 206 +---------------------
> ---
> >  arch/powerpc/sysdev/qe_lib/Makefile       |   2 +-
> >  arch/powerpc/sysdev/qe_lib/qe.c           |  15 ++
> >  arch/powerpc/sysdev/qe_lib/qe_common.c    | 242
> ++++++++++++++++++++++++++++++
> >  12 files changed, 302 insertions(+), 285 deletions(-)  create mode
> > 100644 arch/powerpc/sysdev/qe_lib/qe_common.c
> >
> > diff --git a/arch/powerpc/include/asm/cpm.h
> > b/arch/powerpc/include/asm/cpm.h index 4398a6c..003a736 100644
> > --- a/arch/powerpc/include/asm/cpm.h
> > +++ b/arch/powerpc/include/asm/cpm.h
> > @@ -93,22 +93,6 @@ typedef struct cpm_buf_desc {
> >   */
> >
> >  #define BD_SC_EMPTY	(0x8000)	/* Receive is empty */
> > -#define BD_SC_READY	(0x8000)	/* Transmit is ready */
> > -#define BD_SC_WRAP	(0x2000)	/* Last buffer descriptor */
> > -#define BD_SC_INTRPT	(0x1000)	/* Interrupt on change */
> > -#define BD_SC_LAST	(0x0800)	/* Last buffer in frame */
> > -#define BD_SC_TC	(0x0400)	/* Transmit CRC */
> > -#define BD_SC_CM	(0x0200)	/* Continuous mode */
> > -#define BD_SC_ID	(0x0100)	/* Rec'd too many idles */
> > -#define BD_SC_P		(0x0100)	/* xmt preamble */
> > -#define BD_SC_BR	(0x0020)	/* Break received */
> > -#define BD_SC_FR	(0x0010)	/* Framing error */
> > -#define BD_SC_PR	(0x0008)	/* Parity error */
> > -#define BD_SC_NAK	(0x0004)	/* NAK - did not respond */
> > -#define BD_SC_OV	(0x0002)	/* Overrun */
> > -#define BD_SC_UN	(0x0002)	/* Underrun */
> > -#define BD_SC_CD	(0x0001)	/* */
> > -#define BD_SC_CL	(0x0001)	/* Collision */
> 
> What does this have to do with muram?

BD is Buffer Descriptors, it is in muram.

> 
> > -/* we actually use cpm_muram implementation, define this for
> > convenience */ -#define qe_muram_init cpm_muram_init -#define
> > qe_muram_alloc cpm_muram_alloc -#define qe_muram_alloc_fixed
> > cpm_muram_alloc_fixed -#define qe_muram_free cpm_muram_free -#define
> > qe_muram_addr cpm_muram_addr -#define qe_muram_offset cpm_muram_offset
> > +/* we actually use qe_muram implementation, define this for
> > +convenience */ #define cpm_muram_init qe_muram_init #define
> > +cpm_muram_alloc qe_muram_alloc #define cpm_muram_alloc_fixed
> > +qe_muram_alloc_fixed #define cpm_muram_free qe_muram_free #define
> > +cpm_muram_addr qe_muram_addr #define cpm_muram_offset qe_muram_offset
> 
> I've said many times now that any changes to the code, including renaming
> functions, needs to be a separate patch from moving the code.

I have split a patch to two patches, However, Maybe I misunderstand your means.
So if the patch just do the renaming and moving cpm_muram function to qe_muram function,
Does it ok?

> 
> -Scott
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