linux-kernel - Re: [PATCHv8 5/5] coresight: cpu-debug: Add support for Qualcomm Kryo

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Date:   Sun, 21 Jul 2019 22:35:53 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mike Leach <mike.leach@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree@...r.kernel.org, David Brown <david.brown@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>
Subject: Re: [PATCHv8 5/5] coresight: cpu-debug: Add support for Qualcomm Kryo

On Wed, Jul 17, 2019 at 10:56:02AM -0600, Mathieu Poirier wrote:
> On Fri, Jul 12, 2019 at 07:46:27PM +0530, Sai Prakash Ranjan wrote:
> > Add support for coresight CPU debug module on Qualcomm
> > Kryo CPUs. This patch adds the UCI entries for Kryo CPUs
> > found on MSM8996 which shares the same PIDs as ETMs.
> > 
> > Without this, below error is observed on MSM8996:
> > 
> > [    5.429867] OF: graph: no port node found in /soc/debug@...0000
> > [    5.429938] coresight-etm4x: probe of 3810000.debug failed with error -22
> > [    5.435415] coresight-cpu-debug 3810000.debug: Coresight debug-CPU0 initialized
> > [    5.446474] OF: graph: no port node found in /soc/debug@...0000
> > [    5.448927] coresight-etm4x: probe of 3910000.debug failed with error -22
> > [    5.454681] coresight-cpu-debug 3910000.debug: Coresight debug-CPU1 initialized
> > [    5.487765] OF: graph: no port node found in /soc/debug@...0000
> > [    5.488007] coresight-etm4x: probe of 3a10000.debug failed with error -22
> > [    5.493024] coresight-cpu-debug 3a10000.debug: Coresight debug-CPU2 initialized
> > [    5.501802] OF: graph: no port node found in /soc/debug@...0000
> > [    5.512901] coresight-etm4x: probe of 3b10000.debug failed with error -22
> > [    5.513192] coresight-cpu-debug 3b10000.debug: Coresight debug-CPU3 initialized
> > 
> > Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> > ---
> >  .../hwtracing/coresight/coresight-cpu-debug.c | 33 +++++++++----------
> >  drivers/hwtracing/coresight/coresight-priv.h  | 10 +++---
> >  2 files changed, 21 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/hwtracing/coresight/coresight-cpu-debug.c b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> > index 2463aa7ab4f6..96544b348c27 100644
> > --- a/drivers/hwtracing/coresight/coresight-cpu-debug.c
> > +++ b/drivers/hwtracing/coresight/coresight-cpu-debug.c
> > @@ -646,24 +646,23 @@ static int debug_remove(struct amba_device *adev)
> >  	return 0;
> >  }
> >  
> > +static const struct amba_cs_uci_id uci_id_debug[] = {
> > +	{
> > +		/*  CPU Debug UCI data */
> > +		.devarch	= 0x47706a15,
> > +		.devarch_mask	= 0xfff0ffff,
> > +		.devtype	= 0x00000015,
> > +	}
> > +};
> > +
> >  static const struct amba_id debug_ids[] = {
> > -	{       /* Debug for Cortex-A53 */
> > -		.id	= 0x000bbd03,
> > -		.mask	= 0x000fffff,
> > -	},
> > -	{       /* Debug for Cortex-A57 */
> > -		.id	= 0x000bbd07,
> > -		.mask	= 0x000fffff,
> > -	},
> > -	{       /* Debug for Cortex-A72 */
> > -		.id	= 0x000bbd08,
> > -		.mask	= 0x000fffff,
> > -	},
> > -	{       /* Debug for Cortex-A73 */
> > -		.id	= 0x000bbd09,
> > -		.mask	= 0x000fffff,
> > -	},
> > -	{ 0, 0 },
> > +	CS_AMBA_ID(0x000bbd03),				/* Cortex-A53 */
> > +	CS_AMBA_ID(0x000bbd07),				/* Cortex-A57 */
> > +	CS_AMBA_ID(0x000bbd08),				/* Cortex-A72 */
> > +	CS_AMBA_ID(0x000bbd09),				/* Cortex-A73 */
> > +	CS_AMBA_UCI_ID(0x000f0205, uci_id_debug),	/* Qualcomm Kryo */
> > +	CS_AMBA_UCI_ID(0x000f0211, uci_id_debug),	/* Qualcomm Kryo */
> > +	{},
> >  };
> >  
> >  static struct amba_driver debug_driver = {
> > diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> > index 7d401790dd7e..41ae5863104d 100644
> > --- a/drivers/hwtracing/coresight/coresight-priv.h
> > +++ b/drivers/hwtracing/coresight/coresight-priv.h
> > @@ -185,11 +185,11 @@ static inline int etm_writel_cp14(u32 off, u32 val) { return 0; }
> >  	}
> >  
> >  /* coresight AMBA ID, full UCI structure: id table entry. */
> > -#define CS_AMBA_UCI_ID(pid, uci_ptr)	\
> > -	{				\
> > -		.id	= pid,		\
> > -		.mask	= 0x000fffff,	\
> > -		.data	= uci_ptr	\
> > +#define CS_AMBA_UCI_ID(pid, uci_ptr)		\
> > +	{					\
> > +		.id	= pid,			\
> > +		.mask	= 0x000fffff,		\
> > +		.data	= (void *)uci_ptr	\
> >  	}
> 
> I will pickup this patch - it will show up in my next tree when rc1 comes out.

I tested this patch on the mainline kernel with latest commit
f1a3b43cc1f5 ("Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input"). FWIW:

Tested-by: Leo Yan <leo.yan@...aro.org>

P.s. Acutally I tested this patch for 5.2-rcx a few days ago and found
a regression for CPU debug module: I observed the CPU debug module
panic dump will stuck.  After I pulled to latest kernel code base the
CPU debug module can work well; also works well with this patch.  F.Y.I.

Thanks,
Leo Yan