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Message-ID: <20140328093625.4d583774@bahia.local>
Date: Fri, 28 Mar 2014 09:36:25 +0100
From: Greg Kurz <gkurz@...ux.vnet.ibm.com>
To: Laurent Dufour <laurent.dufour@...ibm.com>
Cc: benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
paulus@...ba.org, anton@...ba.org, nfont@...ux.vnet.ibm.com,
linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/le: enable RTAS events support
On Fri, 28 Mar 2014 09:29:22 +0100
Laurent Dufour <laurent.dufour@...ibm.com> wrote:
> On 28/03/2014 08:33, Greg Kurz wrote:
> > The current kernel code assumes big endian and parses RTAS events all
> > wrong. The most visible effect is that we cannot honor EPOW events,
> > meaning, for example, we cannot shut down a guest properly from the
> > hypervisor.
> >
> > This patch fixes that.
> >
> > Signed-off-by: Greg Kurz <gkurz@...ux.vnet.ibm.com>
>
> Reviewed-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
>
> > ---
> > arch/powerpc/include/asm/rtas.h | 46 ++++++++++++++++++++++++++++++++++
> > arch/powerpc/kernel/rtas.c | 11 ++++----
> > arch/powerpc/kernel/rtasd.c | 8 ++++--
> > arch/powerpc/platforms/pseries/ras.c | 3 +-
> > 4 files changed, 59 insertions(+), 9 deletions(-)
> >
> > diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h
> > index 9bd52c6..8bb99d0 100644
> > --- a/arch/powerpc/include/asm/rtas.h
> > +++ b/arch/powerpc/include/asm/rtas.h
> > @@ -150,15 +150,37 @@ struct rtas_suspend_me_data {
> > #define RTAS_VECTOR_EXTERNAL_INTERRUPT 0x500
> >
> > struct rtas_error_log {
> > +#ifdef __BIG_ENDIAN__
> > + /* Byte 0 */
> > unsigned long version:8; /* Architectural version */
> > + /* Byte 1 */
> > unsigned long severity:3; /* Severity level of error */
> > unsigned long disposition:2; /* Degree of recovery */
> > unsigned long extended:1; /* extended log present? */
> > unsigned long /* reserved */ :2; /* Reserved for future use */
> > + /* Byte 2 */
> > unsigned long initiator:4; /* Initiator of event */
> > unsigned long target:4; /* Target of failed operation */
> > + /* Byte 3 */
> > unsigned long type:8; /* General event or error*/
> > + /* Byte 4 */
> > unsigned long extended_log_length:32; /* length in bytes */
> > +#else
> > + /* Byte 0 */
> > + unsigned long version:8;
> > + /* Byte 1 */
> > + unsigned long :2;
> > + unsigned long extended:1;
> > + unsigned long disposition:2;
> > + unsigned long severity:3;
> > + unsigned long target:4;
>
> Hi Greg,
>
> A cosmetic detail: 'target' is in the 'Byte 2'.
>
> Laurent.
>
Good catch ! Thanks.
> > + /* Byte 2 */
> > + unsigned long initiator:4;
> > + /* Byte 3 */
> > + unsigned long type:8;
> > + /* Byte 4 */
> > + unsigned long extended_log_length:32;
> > +#endif
> > unsigned char buffer[1]; /* Start of extended log */
> > /* Variable length. */
> > };
> > @@ -171,6 +193,7 @@ struct rtas_error_log {
> > * from "buffer" field of struct rtas_error_log defined above.
> > */
> > struct rtas_ext_event_log_v6 {
> > +#ifdef __BIG_ENDIAN__
> > /* Byte 0 */
> > uint32_t log_valid:1; /* 1:Log valid */
> > uint32_t unrecoverable_error:1; /* 1:Unrecoverable error */
> > @@ -200,6 +223,29 @@ struct rtas_ext_event_log_v6 {
> > uint32_t company_id; /* Company ID of the company */
> > /* that defines the format for */
> > /* the vendor specific log type */
> > +#else
> > + /* Byte 0 */
> > + uint32_t :1;
> > + uint32_t big_endian:1;
> > + uint32_t new_log:1;
> > + uint32_t predictive_error:1;
> > + uint32_t degraded_operation:1;
> > + uint32_t recoverable_error:1;
> > + uint32_t unrecoverable_error:1;
> > + uint32_t log_valid:1;
> > + /* Byte 1 */
> > + uint32_t :8;
> > + /* Byte 2 */
> > + uint32_t log_format:4;
> > + uint32_t :3;
> > + uint32_t powerpc_format:1;
> > + /* Byte 3 */
> > + uint32_t :8;
> > + /* Byte 4-11 */
> > + uint8_t reserved[8];
> > + /* Byte 12-15 */
> > + uint32_t company_id;
> > +#endif
> > /* Byte 16-end of log */
> > uint8_t vendor_log[1]; /* Start of vendor specific log */
> > /* Variable length. */
> > diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c
> > index f386296..e18ab12 100644
> > --- a/arch/powerpc/kernel/rtas.c
> > +++ b/arch/powerpc/kernel/rtas.c
> > @@ -993,21 +993,22 @@ struct pseries_errorlog *get_pseries_errorlog(struct rtas_error_log *log,
> > (struct rtas_ext_event_log_v6 *)log->buffer;
> > struct pseries_errorlog *sect;
> > unsigned char *p, *log_end;
> > + uint32_t extended_log_length = be32_to_cpu(log->extended_log_length);
> >
> > /* Check that we understand the format */
> > - if (log->extended_log_length < sizeof(struct rtas_ext_event_log_v6) ||
> > + if (extended_log_length < sizeof(struct rtas_ext_event_log_v6) ||
> > ext_log->log_format != RTAS_V6EXT_LOG_FORMAT_EVENT_LOG ||
> > - ext_log->company_id != RTAS_V6EXT_COMPANY_ID_IBM)
> > + be32_to_cpu(ext_log->company_id) != RTAS_V6EXT_COMPANY_ID_IBM)
> > return NULL;
> >
> > - log_end = log->buffer + log->extended_log_length;
> > + log_end = log->buffer + extended_log_length;
> > p = ext_log->vendor_log;
> >
> > while (p < log_end) {
> > sect = (struct pseries_errorlog *)p;
> > - if (sect->id == section_id)
> > + if (be16_to_cpu(sect->id) == section_id)
> > return sect;
> > - p += sect->length;
> > + p += be16_to_cpu(sect->length);
> > }
> >
> > return NULL;
> > diff --git a/arch/powerpc/kernel/rtasd.c b/arch/powerpc/kernel/rtasd.c
> > index 1130c53..1987825 100644
> > --- a/arch/powerpc/kernel/rtasd.c
> > +++ b/arch/powerpc/kernel/rtasd.c
> > @@ -159,14 +159,16 @@ static int log_rtas_len(char * buf)
> > {
> > int len;
> > struct rtas_error_log *err;
> > + uint32_t extended_log_length;
> >
> > /* rtas fixed header */
> > len = 8;
> > err = (struct rtas_error_log *)buf;
> > - if (err->extended && err->extended_log_length) {
> > + extended_log_length = be32_to_cpu(err->extended_log_length);
> > + if (err->extended && extended_log_length) {
> >
> > /* extended header */
> > - len += err->extended_log_length;
> > + len += extended_log_length;
> > }
> >
> > if (rtas_error_log_max == 0)
> > @@ -298,7 +300,7 @@ static void handle_rtas_event(const struct rtas_error_log *log)
> > * the scope for calling rtas update-nodes.
> > */
> > if (prrn_is_enabled())
> > - prrn_schedule_update(log->extended_log_length);
> > + prrn_schedule_update(be32_to_cpu(log->extended_log_length));
> > }
> >
> > return;
> > diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
> > index 721c058..39e7557 100644
> > --- a/arch/powerpc/platforms/pseries/ras.c
> > +++ b/arch/powerpc/platforms/pseries/ras.c
> > @@ -306,7 +306,8 @@ static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
> > } else {
> > int len;
> >
> > - len = max_t(int, 8+h->extended_log_length, RTAS_ERROR_LOG_MAX);
> > + len = max_t(int, 8+be32_to_cpu(h->extended_log_length),
> > + RTAS_ERROR_LOG_MAX);
> > memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
> > memcpy(global_mce_data_buf, h, len);
> > errhdr = (struct rtas_error_log *)global_mce_data_buf;
> >
> > _______________________________________________
> > Linuxppc-dev mailing list
> > Linuxppc-dev@...ts.ozlabs.org
> > https://lists.ozlabs.org/listinfo/linuxppc-dev
> >
>
--
Gregory Kurz kurzgreg@...ibm.com
gkurz@...ux.vnet.ibm.com
Software Engineer @ IBM/Meiosys http://www.ibm.com
Tel +33 (0)562 165 496
"Anarchy is about taking complete responsibility for yourself."
Alan Moore.
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