linux-kernel - Re: [PATCH v8 1/2] powerpc/rtas: Rename rtas_error_rc to rtas_generic

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Date:   Wed, 16 Aug 2023 21:53:36 +0530
From:   Mahesh J Salgaonkar <mahesh@...ux.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev <linuxppc-dev@...abs.org>,
        Tyrel Datwyler <tyreld@...ux.ibm.com>,
        Nathan Lynch <nathanl@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 1/2] powerpc/rtas: Rename rtas_error_rc to
 rtas_generic_errno

On 2023-08-15 13:52:14 Tue, Michael Ellerman wrote:
> Mahesh Salgaonkar <mahesh@...ux.ibm.com> writes:
> > rtas_generic_errno() function will convert the generic rtas return codes
> > into errno.
> 
> I don't see the point of renaming it, it just creates unnecessary churn.
> The existing name seems OK to me.

Sure. Will revert back to existing name.

> 
> ...
> 
> > diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
> > index 3abe15ac79db1..5572a0a2f6e18 100644
> > --- a/arch/powerpc/include/asm/rtas.h
> > +++ b/arch/powerpc/include/asm/rtas.h
> > @@ -202,7 +202,9 @@ typedef struct {
> >  #define RTAS_USER_REGION_SIZE (64 * 1024)
> >  
> >  /* RTAS return status codes */
> > -#define RTAS_BUSY		-2    /* RTAS Busy */
> > +#define RTAS_HARDWARE_ERROR	(-1)  /* Hardware Error */
> > +#define RTAS_BUSY		(-2)  /* RTAS Busy */
> 
> Are the brackets necessary?

During v5 changset I received offline review comment to add brackets,
hence continued here as well. I can take it away if Nathan is fine with
it.

> 
> > +#define RTAS_INVALID_PARAMETER	(-3)  /* Invalid indicator/domain/sensor etc. */
> >  #define RTAS_EXTENDED_DELAY_MIN	9900
> >  #define RTAS_EXTENDED_DELAY_MAX	9905
> >  
> > @@ -212,6 +214,11 @@ typedef struct {
> >  #define RTAS_THREADS_ACTIVE     -9005 /* Multiple processor threads active */
> >  #define RTAS_OUTSTANDING_COPROC -9006 /* Outstanding coprocessor operations */
> >  
> > +/* statuses specific to get-sensor-state */
> > +#define RTAS_SLOT_UNISOLATED		(-9000)
> > +#define RTAS_SLOT_NOT_UNISOLATED	(-9001)
> > +#define RTAS_SLOT_NOT_USABLE		(-9002)
> 
> These aren't specific to get-sensor-state.
> 
> They're used by at least: ibm,manage-flash-image, ibm,activate-firmware,
> ibm,configure-connector, set-indicator etc.
> 
> They have different meanings for those calls. I think you're best to
> just leave the constant values in rtas_error_rc().

Sure, I will leave them as constant in rtas_error_rc() and move these
three #defines to drivers/pci/hotplug/rpaphp_pci.c in 2/2 patch where it
makes sense.

> 
> >  /* RTAS event classes */
> >  #define RTAS_INTERNAL_ERROR		0x80000000 /* set bit 0 */
> >  #define RTAS_EPOW_WARNING		0x40000000 /* set bit 1 */
> > @@ -425,6 +432,7 @@ extern int rtas_set_indicator(int indicator, int index, int new_value);
> >  extern int rtas_set_indicator_fast(int indicator, int index, int new_value);
> >  extern void rtas_progress(char *s, unsigned short hex);
> >  int rtas_ibm_suspend_me(int *fw_status);
> > +int rtas_generic_errno(int rtas_rc);
> >  
> >  struct rtc_time;
> >  extern time64_t rtas_get_boot_time(void);
> > diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
> > index c087eeee320ff..80b6099e8ce20 100644
> > --- a/arch/powerpc/kernel/rtas.c
> > +++ b/arch/powerpc/kernel/rtas.c
> > @@ -1330,33 +1330,34 @@ bool __ref rtas_busy_delay(int status)
> >  }
> >  EXPORT_SYMBOL_GPL(rtas_busy_delay);
> >  
> > -static int rtas_error_rc(int rtas_rc)
> > +int rtas_generic_errno(int rtas_rc)
> >  {
> >  	int rc;
> >  
> >  	switch (rtas_rc) {
> > -		case -1: 		/* Hardware Error */
> > -			rc = -EIO;
> > -			break;
> > -		case -3:		/* Bad indicator/domain/etc */
> > -			rc = -EINVAL;
> > -			break;
> > -		case -9000:		/* Isolation error */
> > -			rc = -EFAULT;
> > -			break;
> > -		case -9001:		/* Outstanding TCE/PTE */
> > -			rc = -EEXIST;
> > -			break;
> > -		case -9002:		/* No usable slot */
> > -			rc = -ENODEV;
> > -			break;
> > -		default:
> > -			pr_err("%s: unexpected error %d\n", __func__, rtas_rc);
> > -			rc = -ERANGE;
> > -			break;
> > +	case RTAS_HARDWARE_ERROR:	/* Hardware Error */
> > +		rc = -EIO;
> > +		break;
> > +	case RTAS_INVALID_PARAMETER:	/* Bad indicator/domain/etc */
> > +		rc = -EINVAL;
> > +		break;
> > +	case RTAS_SLOT_UNISOLATED:	/* Isolation error */
> > +		rc = -EFAULT;
> > +		break;
> > +	case RTAS_SLOT_NOT_UNISOLATED:	/* Outstanding TCE/PTE */
> > +		rc = -EEXIST;
> > +		break;
> > +	case RTAS_SLOT_NOT_USABLE:	/* No usable slot */
> > +		rc = -ENODEV;
> > +		break;
> > +	default:
> > +		pr_err("%s: unexpected error %d\n", __func__, rtas_rc);
> > +		rc = -ERANGE;
> > +		break;
> >  	}
> >  	return rc;
> >  }
> > +EXPORT_SYMBOL(rtas_generic_errno);
>   
> Should be GPL.

Will fix it in next revision.

Thanks for your review.
-- 
Mahesh J Salgaonkar