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

[Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>]

On 7/21/2019 8:05 PM, Leo Yan wrote:
> 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@3810000
> > > [    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@3910000
> > > [    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@3a10000
> > > [    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@3b10000
> > > [    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@xxxxxxxxxxxxxx>
> > > ---
> > >   .../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@xxxxxxxxxx>
>
> 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.

-Sai

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