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Date: Fri, 22 Feb 2013 08:45:11 +0800
From: Huang Ying <ying.huang@...el.com>
To: Mauro Carvalho Chehab <mchehab@...hat.com>
Cc: linux-acpi@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
Linux Edac Mailing List <linux-edac@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH EDAC 03/13] ghes: add the needed hooks for EDAC error
report
On Thu, 2013-02-21 at 09:04 -0300, Mauro Carvalho Chehab wrote:
> Em Thu, 21 Feb 2013 09:26:07 +0800
> Huang Ying <ying.huang@...el.com> escreveu:
>
> > Sorry for late!
>
> Thanks for your comments. See my answers below.
> >
> > On Fri, 2013-02-15 at 10:44 -0200, Mauro Carvalho Chehab wrote:
> > > In order to allow reporting errors via EDAC, add hooks for:
> > >
> > > 1) register an EDAC driver;
> > > 2) unregister an EDAC driver;
> > > 3) report errors via EDAC.
> > >
> > > As the EDAC driver will need to access the ghes structure, adds it
> > > as one of the parameters for ghes_do_proc.
> > >
> > > Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> > > ---
> > > drivers/acpi/apei/ghes.c | 17 ++++++++++++++---
> > > include/acpi/ghes.h | 27 +++++++++++++++++++++++++++
> > > 2 files changed, 41 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> > > index 6d0e146..a21d7da 100644
> > > --- a/drivers/acpi/apei/ghes.c
> > > +++ b/drivers/acpi/apei/ghes.c
> > > @@ -409,7 +409,8 @@ static void ghes_clear_estatus(struct ghes *ghes)
> > > ghes->flags &= ~GHES_TO_CLEAR;
> > > }
> > >
> > > -static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
> > > +static void ghes_do_proc(struct ghes *ghes,
> > > + const struct acpi_hest_generic_status *estatus)
> > > {
> > > int sev, sec_sev;
> > > struct acpi_hest_generic_data *gdata;
> > > @@ -421,6 +422,8 @@ static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
> > > CPER_SEC_PLATFORM_MEM)) {
> > > struct cper_sec_mem_err *mem_err;
> > > mem_err = (struct cper_sec_mem_err *)(gdata+1);
> > > + ghes_edac_report_mem_error(ghes, sev, mem_err);
> > > +
> > > #ifdef CONFIG_X86_MCE
> > > apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
> > > mem_err);
> > > @@ -639,7 +642,7 @@ static int ghes_proc(struct ghes *ghes)
> > > if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
> > > ghes_estatus_cache_add(ghes->generic, ghes->estatus);
> > > }
> > > - ghes_do_proc(ghes->estatus);
> > > + ghes_do_proc(ghes, ghes->estatus);
> > > out:
> > > ghes_clear_estatus(ghes);
> > > return 0;
> > > @@ -732,7 +735,7 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
> > > estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
> > > len = apei_estatus_len(estatus);
> > > node_len = GHES_ESTATUS_NODE_LEN(len);
> > > - ghes_do_proc(estatus);
> > > + ghes_do_proc(estatus_node->ghes, estatus);
> > > if (!ghes_estatus_cached(estatus)) {
> > > generic = estatus_node->generic;
> > > if (ghes_print_estatus(NULL, generic, estatus))
> > > @@ -821,6 +824,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
> > > estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
> > > node_len);
> > > if (estatus_node) {
> > > + estatus_node->ghes = ghes;
> > > estatus_node->generic = ghes->generic;
> > > estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
> > > memcpy(estatus, ghes->estatus, len);
> > > @@ -942,6 +946,10 @@ static int ghes_probe(struct platform_device *ghes_dev)
> > > }
> > > platform_set_drvdata(ghes_dev, ghes);
> > >
> > > + rc = ghes_edac_register(ghes, &ghes_dev->dev);
> > > + if (rc < 0)
> > > + goto err;
> > > +
> >
> > If ghes_edac_register() failed, we need to do some cleanup such as
> > unregister from hed etc.
> >
> > Or just move ghes_edac_register() before switch?
>
> Moving it to happen before the switch() looks the better. We need to unregister
> ghes_edac if IRQ fails.
>
> > > return 0;
> > > err:
> > > if (ghes) {
> > > @@ -995,6 +1003,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
> > > }
> > >
> > > ghes_fini(ghes);
> > > +
> > > + ghes_edac_unregister(ghes);
> > > +
> > > kfree(ghes);
> > >
> > > platform_set_drvdata(ghes_dev, NULL);
> > > diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> > > index 3eb8dc4..c6fef72 100644
> > > --- a/include/acpi/ghes.h
> > > +++ b/include/acpi/ghes.h
> > > @@ -22,11 +22,14 @@ struct ghes {
> > > struct timer_list timer;
> > > unsigned int irq;
> > > };
> > > +
> > > + struct mem_ctl_info *mci;
> >
> > Why we need this? This is not used by ghes.[hc].
>
> This will be needed by the EDAC driver, as the EDAC core has its own main
> struct, and such struct need to be recovered when reporting an error.
>
> As this struct is not used by ghes, there's no need to even include the
> include/linux/edac.h, where this is declared, as gcc will just handle it
> as "void *" when compiling ghes.
>
> I opted for this design as it is simpler, and costs just 8 bytes for each
> ghes struct, and no extra code is needed.
>
> However, as you're not happy with it, I'm removing it from there, and adding
> a list at the edac driver, together with a mutex, to serialize its access,
> associating each ghes struct with their corresponding MC struct.
>
> I'll post the patch replacing patch 05/13 soon.
>
> >
> > > };
> > >
> > > struct ghes_estatus_node {
> > > struct llist_node llnode;
> > > struct acpi_hest_generic *generic;
> > > + struct ghes *ghes;
> > > };
> > >
> > > struct ghes_estatus_cache {
> > > @@ -43,3 +46,27 @@ enum {
> > > GHES_SEV_RECOVERABLE = 0x2,
> > > GHES_SEV_PANIC = 0x3,
> > > };
> > > +
> > > +#ifdef CONFIG_EDAC_GHES
> > > +void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
> > > + struct cper_sec_mem_err *mem_err);
> > > +
> > > +int ghes_edac_register(struct ghes *ghes, struct device *dev);
> > > +
> > > +void ghes_edac_unregister(struct ghes *ghes);
> > > +
> > > +#else
> > > +static inline void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
> > > + struct cper_sec_mem_err *mem_err)
> > > +{
> > > +}
> > > +
> > > +static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
> > > +{
> > > + return 0;
> > > +}
> > > +
> > > +static inline void ghes_edac_unregister(struct ghes *ghes)
> > > +{
> > > +}
> > > +#endif
> >
> > I think it is better to put the above declaration into module which
> > implement these functions instead of use these functions.
>
> This is due to Linux Coding Style. See Documentation/SubmittingPatches,
> session 2, item 1:
>
> 2) #ifdefs are ugly
>
> Code cluttered with ifdefs is difficult to read and maintain. Don't do
> it. Instead, put your ifdefs in a header, and conditionally define
> 'static inline' functions, or macros, which are used in the code.
> Let the compiler optimize away the "no-op" case.
>
> Simple example, of poor code:
>
> dev = alloc_etherdev (sizeof(struct funky_private));
> if (!dev)
> return -ENODEV;
> #ifdef CONFIG_NET_FUNKINESS
> init_funky_net(dev);
> #endif
>
> Cleaned-up example:
>
> (in header)
> #ifndef CONFIG_NET_FUNKINESS
> static inline void init_funky_net (struct net_device *d) {}
> #endif
>
> (in the code itself)
> dev = alloc_etherdev (sizeof(struct funky_private));
> if (!dev)
> return -ENODEV;
> init_funky_net(dev);
>
> There is also an advantage on taking this approach: this patch can have just
> the ghes changes, and will still compile fine, as CONFIG_EDAC_GHES is not
> defined yet. So, the patch becomes is simpler and easier to review.
Thanks for your explanation. I agree to keep this in header file.
My original suggestion is that it may be better to move this from ghes.h
to some place like "ghes_edac.h", because these functions are
implemented in "ghes_edac.c" instead of ghes.c.
> If I would do it otherwise, I would need to fold patch 5 to avoid breaking
> git bisect.
>
> Regards,
> Mauro
>
> Patch with the changes enclosed.
>
> -
>
> [PATCH EDACv2 03/13] ghes: add the needed hooks for EDAC error report
>
> In order to allow reporting errors via EDAC, add hooks for:
>
> 1) register an EDAC driver;
> 2) unregister an EDAC driver;
> 3) report errors via EDAC.
>
> As the EDAC driver will need to access the ghes structure, adds it
> as one of the parameters for ghes_do_proc.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
>
> diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
> index 6d0e146..19092dc 100644
> --- a/drivers/acpi/apei/ghes.c
> +++ b/drivers/acpi/apei/ghes.c
> @@ -409,7 +409,8 @@ static void ghes_clear_estatus(struct ghes *ghes)
> ghes->flags &= ~GHES_TO_CLEAR;
> }
>
> -static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
> +static void ghes_do_proc(struct ghes *ghes,
> + const struct acpi_hest_generic_status *estatus)
> {
> int sev, sec_sev;
> struct acpi_hest_generic_data *gdata;
> @@ -421,6 +422,8 @@ static void ghes_do_proc(const struct acpi_hest_generic_status *estatus)
> CPER_SEC_PLATFORM_MEM)) {
> struct cper_sec_mem_err *mem_err;
> mem_err = (struct cper_sec_mem_err *)(gdata+1);
> + ghes_edac_report_mem_error(ghes, sev, mem_err);
> +
> #ifdef CONFIG_X86_MCE
> apei_mce_report_mem_error(sev == GHES_SEV_CORRECTED,
> mem_err);
> @@ -639,7 +642,7 @@ static int ghes_proc(struct ghes *ghes)
> if (ghes_print_estatus(NULL, ghes->generic, ghes->estatus))
> ghes_estatus_cache_add(ghes->generic, ghes->estatus);
> }
> - ghes_do_proc(ghes->estatus);
> + ghes_do_proc(ghes, ghes->estatus);
> out:
> ghes_clear_estatus(ghes);
> return 0;
> @@ -732,7 +735,7 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
> estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
> len = apei_estatus_len(estatus);
> node_len = GHES_ESTATUS_NODE_LEN(len);
> - ghes_do_proc(estatus);
> + ghes_do_proc(estatus_node->ghes, estatus);
> if (!ghes_estatus_cached(estatus)) {
> generic = estatus_node->generic;
> if (ghes_print_estatus(NULL, generic, estatus))
> @@ -821,6 +824,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
> estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
> node_len);
> if (estatus_node) {
> + estatus_node->ghes = ghes;
> estatus_node->generic = ghes->generic;
> estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
> memcpy(estatus, ghes->estatus, len);
> @@ -899,6 +903,11 @@ static int ghes_probe(struct platform_device *ghes_dev)
> ghes = NULL;
> goto err;
> }
> +
> + rc = ghes_edac_register(ghes, &ghes_dev->dev);
> + if (rc < 0)
> + goto err;
> +
> switch (generic->notify.type) {
> case ACPI_HEST_NOTIFY_POLLED:
> ghes->timer.function = ghes_poll_func;
> @@ -911,13 +920,13 @@ static int ghes_probe(struct platform_device *ghes_dev)
> if (acpi_gsi_to_irq(generic->notify.vector, &ghes->irq)) {
> pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
> generic->header.source_id);
> - goto err;
> + goto err2;
> }
> if (request_irq(ghes->irq, ghes_irq_func,
> 0, "GHES IRQ", ghes)) {
> pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
> generic->header.source_id);
> - goto err;
> + goto err2;
> }
> break;
> case ACPI_HEST_NOTIFY_SCI:
> @@ -943,6 +952,8 @@ static int ghes_probe(struct platform_device *ghes_dev)
> platform_set_drvdata(ghes_dev, ghes);
>
> return 0;
> +err2:
Suggest to rename it to err_edac_unreg or something like that. Just a
suggestion.
Best Regards,
Huang Ying
> + ghes_edac_unregister(ghes);
> err:
> if (ghes) {
> ghes_fini(ghes);
> @@ -995,6 +1006,9 @@ static int ghes_remove(struct platform_device *ghes_dev)
> }
>
> ghes_fini(ghes);
> +
> + ghes_edac_unregister(ghes);
> +
> kfree(ghes);
>
> platform_set_drvdata(ghes_dev, NULL);
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 3eb8dc4..9015ec2 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -27,6 +27,7 @@ struct ghes {
> struct ghes_estatus_node {
> struct llist_node llnode;
> struct acpi_hest_generic *generic;
> + struct ghes *ghes;
> };
>
> struct ghes_estatus_cache {
> @@ -43,3 +44,27 @@ enum {
> GHES_SEV_RECOVERABLE = 0x2,
> GHES_SEV_PANIC = 0x3,
> };
> +
> +#ifdef CONFIG_EDAC_GHES
> +void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
> + struct cper_sec_mem_err *mem_err);
> +
> +int ghes_edac_register(struct ghes *ghes, struct device *dev);
> +
> +void ghes_edac_unregister(struct ghes *ghes);
> +
> +#else
> +static inline void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
> + struct cper_sec_mem_err *mem_err)
> +{
> +}
> +
> +static inline int ghes_edac_register(struct ghes *ghes, struct device *dev)
> +{
> + return 0;
> +}
> +
> +static inline void ghes_edac_unregister(struct ghes *ghes)
> +{
> +}
> +#endif
>
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