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Message-ID: <53358DBF.4080808@linux.vnet.ibm.com>
Date: Fri, 28 Mar 2014 09:57:03 -0500
From: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
To: Greg Kurz <gkurz@...ux.vnet.ibm.com>, benh@...nel.crashing.org
CC: linux-kernel@...r.kernel.org, paulus@...ba.org, anton@...ba.org,
linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/le: enable RTAS events support
Greg,
There is one more place that needs fixing up, in mobility_rtas_call(),
and handle_rtas_event() in arch/powerpc/platforms/pseries/mobility.c.
This relates to rtas event handling for PRRN notifications, we need to
convert the scope variable (PRRN notifications re-use the extended log
length field) when read from the rtas event in handle_rtas_event(), then
convert it back to big endian in mobility_rtas_call().
The double conversion seems yucky but mobility_rtas_call can be called
other places where the scope variable is not originally big endian.
-Nathan
On 03/28/2014 02:33 AM, 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>
> ---
> 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;
> + /* 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
>
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