| Message ID | 1468889100-30698-3-git-send-email-vishal.l.verma@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Jul 18, 2016 at 5:44 PM, Vishal Verma <vishal.l.verma@intel.com> wrote: > Normally, an ARS (Address Range Scrub) only happens at > boot/initialization time. There can however arise situations where a > bus-wide rescan is needed - notably, in the case of discovering a latent > media error, we should do a full rescan to figure out what other sectors > are bad, and thus potentially avoid triggering an mce on them in the > future. Also provide a sysfs trigger to start a bus-wide rescan. > > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > Cc: <linux-acpi@vger.kernel.org> > Cc: <linux-nvdimm@lists.01.org> > Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> > --- > drivers/acpi/nfit.c | 36 ++++++++++++++++++++++++++++++++---- > drivers/acpi/nfit.h | 1 + > drivers/nvdimm/core.c | 17 +++++++++++++++++ > include/linux/libnvdimm.h | 1 + > 4 files changed, 51 insertions(+), 4 deletions(-) > > diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c > index ac6ddcc0..def9505 100644 > --- a/drivers/acpi/nfit.c > +++ b/drivers/acpi/nfit.c > @@ -2138,8 +2138,9 @@ static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc, > unsigned int tmo = scrub_timeout; > int rc; > > - if (nfit_spa->ars_done || !nfit_spa->nd_region) > - return; > + if (!nfit_spa->ars_rescan) > + if (nfit_spa->ars_done || !nfit_spa->nd_region) > + return; Do we need a new flag? Why not just clear ->ars_done? > > rc = ars_start(acpi_desc, nfit_spa); > /* > @@ -2227,7 +2228,9 @@ static void acpi_nfit_scrub(struct work_struct *work) > * firmware initiated scrubs to complete and then we go search for the > * affected spa regions to mark them scanned. In the second phase we > * initiate a directed scrub for every range that was not scrubbed in > - * phase 1. > + * phase 1. If we're called for a 'rescan', we harmlessly pass through > + * the first phase, but really only care about running phase 2, where > + * regions can be notified of new poison. > */ I don't think we need to distinguish the initial scan case from the re-scan case in acpi_nfit_scrub(). Whether it's a scan or a re-scan doesn't matter to acpi_nfit_scrub(). > > /* process platform firmware initiated scrubs */ > @@ -2336,8 +2339,10 @@ static void acpi_nfit_scrub(struct work_struct *work) > acpi_nfit_register_region(acpi_desc, nfit_spa); > } > > - list_for_each_entry(nfit_spa, &acpi_desc->spas, list) > + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { > acpi_nfit_async_scrub(acpi_desc, nfit_spa); > + nfit_spa->ars_rescan = 0; > + } > mutex_unlock(&acpi_desc->init_mutex); > } > > @@ -2495,6 +2500,28 @@ static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc, > return 0; > } > > +static int acpi_nfit_ars_rescan(struct nvdimm_bus_descriptor *nd_desc) > +{ > + struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); > + struct device *dev = acpi_desc->dev; > + struct nfit_spa *nfit_spa; > + > + if (work_busy(&acpi_desc->work)) > + return -EBUSY; How does userspace figure out when the queue is not busy? See below in the notes about the ars_rescan attribute. > + > + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { > + struct acpi_nfit_system_address *spa = nfit_spa->spa; > + > + if (nfit_spa_type(spa) != NFIT_SPA_PM) > + continue; > + > + nfit_spa->ars_rescan = 1; > + } > + queue_work(nfit_wq, &acpi_desc->work); > + dev_info(dev, "%s: ars_rescan triggered\n", __func__); > + return 0; > +} > + > void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) > { > struct nvdimm_bus_descriptor *nd_desc; > @@ -2507,6 +2534,7 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) > nd_desc->ndctl = acpi_nfit_ctl; > nd_desc->flush_probe = acpi_nfit_flush_probe; > nd_desc->clear_to_send = acpi_nfit_clear_to_send; > + nd_desc->ars_rescan = acpi_nfit_ars_rescan; > nd_desc->attr_groups = acpi_nfit_attribute_groups; > > INIT_LIST_HEAD(&acpi_desc->spa_maps); > diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h > index 02b9ea1..db95c5d 100644 > --- a/drivers/acpi/nfit.h > +++ b/drivers/acpi/nfit.h > @@ -78,6 +78,7 @@ struct nfit_spa { > struct list_head list; > struct nd_region *nd_region; > unsigned int ars_done:1; > + unsigned int ars_rescan:1; > u32 clear_err_unit; > u32 max_ars; > }; > diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c > index be89764..54f6fd5 100644 > --- a/drivers/nvdimm/core.c > +++ b/drivers/nvdimm/core.c > @@ -313,10 +313,27 @@ static ssize_t wait_probe_show(struct device *dev, > } > static DEVICE_ATTR_RO(wait_probe); > > +static ssize_t ars_rescan_store(struct device *dev, > + struct device_attribute *attr, const char *buf, size_t size) > +{ > + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); > + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; > + int rc; > + > + if (nd_desc->ars_rescan) { > + rc = nd_desc->ars_rescan(nd_desc); > + if (rc) > + return rc; > + } > + return size; > +} > +static DEVICE_ATTR_WO(ars_rescan); A few notes: 1/ ARS is unique to the nfit driver so let's make this nfit specific, i.e. add it to acpi_nfit_attribute_group. 2/ Let's just call the attribute scrub and not distinguish it as "re-" 3/ Userspace may want to know when scanning is complete so let's make this attribute read/write and on read return a count of the number of completed scans since the driver was loaded. For notification of last completion use sysfs_notify_dirent_safe() to make this scrub attribute select()/poll() capable. > + > static struct attribute *nvdimm_bus_attributes[] = { > &dev_attr_commands.attr, > &dev_attr_wait_probe.attr, > &dev_attr_provider.attr, > + &dev_attr_ars_rescan.attr, > NULL, > }; > > diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h > index 0c3c30c..1c6867a 100644 > --- a/include/linux/libnvdimm.h > +++ b/include/linux/libnvdimm.h > @@ -74,6 +74,7 @@ struct nvdimm_bus_descriptor { > int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc); > int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc, > struct nvdimm *nvdimm, unsigned int cmd); > + int (*ars_rescan)(struct nvdimm_bus_descriptor *nd_desc); > }; > > struct nd_cmd_desc { > -- > 2.7.4 >
On 07/19, Dan Williams wrote: > On Mon, Jul 18, 2016 at 5:44 PM, Vishal Verma <vishal.l.verma@intel.com> wrote: > > Normally, an ARS (Address Range Scrub) only happens at > > boot/initialization time. There can however arise situations where a > > bus-wide rescan is needed - notably, in the case of discovering a latent > > media error, we should do a full rescan to figure out what other sectors > > are bad, and thus potentially avoid triggering an mce on them in the > > future. Also provide a sysfs trigger to start a bus-wide rescan. > > > > Cc: Dan Williams <dan.j.williams@intel.com> > > Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Cc: <linux-acpi@vger.kernel.org> > > Cc: <linux-nvdimm@lists.01.org> > > Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> > > --- > > drivers/acpi/nfit.c | 36 ++++++++++++++++++++++++++++++++---- > > drivers/acpi/nfit.h | 1 + > > drivers/nvdimm/core.c | 17 +++++++++++++++++ > > include/linux/libnvdimm.h | 1 + > > 4 files changed, 51 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c > > index ac6ddcc0..def9505 100644 > > --- a/drivers/acpi/nfit.c > > +++ b/drivers/acpi/nfit.c > > @@ -2138,8 +2138,9 @@ static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc, > > unsigned int tmo = scrub_timeout; > > int rc; > > > > - if (nfit_spa->ars_done || !nfit_spa->nd_region) > > - return; > > + if (!nfit_spa->ars_rescan) > > + if (nfit_spa->ars_done || !nfit_spa->nd_region) > > + return; > > Do we need a new flag? Why not just clear ->ars_done? This is what I had started out with - clearing the done flag, but the done flag gets set at the end of acpi_nfit_scrub if a region has been registered for that SPA. In the rescan case, we'll almost always have our regions registered, so the done flag will get set here, and acpi_nfit_async_scrub won't look at it at all.. > > > > > rc = ars_start(acpi_desc, nfit_spa); > > /* > > @@ -2227,7 +2228,9 @@ static void acpi_nfit_scrub(struct work_struct *work) > > * firmware initiated scrubs to complete and then we go search for the > > * affected spa regions to mark them scanned. In the second phase we > > * initiate a directed scrub for every range that was not scrubbed in > > - * phase 1. > > + * phase 1. If we're called for a 'rescan', we harmlessly pass through > > + * the first phase, but really only care about running phase 2, where > > + * regions can be notified of new poison. > > */ > > I don't think we need to distinguish the initial scan case from the > re-scan case in acpi_nfit_scrub(). Whether it's a scan or a re-scan > doesn't matter to acpi_nfit_scrub(). Right, other than the above flag, we don't really distinguish betweent the two. The comment was just a clarification/note that nothing meaningful happens in this function for the rescan case. > > > > > /* process platform firmware initiated scrubs */ > > @@ -2336,8 +2339,10 @@ static void acpi_nfit_scrub(struct work_struct *work) > > acpi_nfit_register_region(acpi_desc, nfit_spa); > > } > > > > - list_for_each_entry(nfit_spa, &acpi_desc->spas, list) > > + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { > > acpi_nfit_async_scrub(acpi_desc, nfit_spa); > > + nfit_spa->ars_rescan = 0; > > + } > > mutex_unlock(&acpi_desc->init_mutex); > > } > > > > @@ -2495,6 +2500,28 @@ static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc, > > return 0; > > } > > > > +static int acpi_nfit_ars_rescan(struct nvdimm_bus_descriptor *nd_desc) > > +{ > > + struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); > > + struct device *dev = acpi_desc->dev; > > + struct nfit_spa *nfit_spa; > > + > > + if (work_busy(&acpi_desc->work)) > > + return -EBUSY; > > How does userspace figure out when the queue is not busy? See below > in the notes about the ars_rescan attribute. > > > + > > + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { > > + struct acpi_nfit_system_address *spa = nfit_spa->spa; > > + > > + if (nfit_spa_type(spa) != NFIT_SPA_PM) > > + continue; > > + > > + nfit_spa->ars_rescan = 1; > > + } > > + queue_work(nfit_wq, &acpi_desc->work); > > + dev_info(dev, "%s: ars_rescan triggered\n", __func__); > > + return 0; > > +} > > + > > void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) > > { > > struct nvdimm_bus_descriptor *nd_desc; > > @@ -2507,6 +2534,7 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) > > nd_desc->ndctl = acpi_nfit_ctl; > > nd_desc->flush_probe = acpi_nfit_flush_probe; > > nd_desc->clear_to_send = acpi_nfit_clear_to_send; > > + nd_desc->ars_rescan = acpi_nfit_ars_rescan; > > nd_desc->attr_groups = acpi_nfit_attribute_groups; > > > > INIT_LIST_HEAD(&acpi_desc->spa_maps); > > diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h > > index 02b9ea1..db95c5d 100644 > > --- a/drivers/acpi/nfit.h > > +++ b/drivers/acpi/nfit.h > > @@ -78,6 +78,7 @@ struct nfit_spa { > > struct list_head list; > > struct nd_region *nd_region; > > unsigned int ars_done:1; > > + unsigned int ars_rescan:1; > > u32 clear_err_unit; > > u32 max_ars; > > }; > > diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c > > index be89764..54f6fd5 100644 > > --- a/drivers/nvdimm/core.c > > +++ b/drivers/nvdimm/core.c > > @@ -313,10 +313,27 @@ static ssize_t wait_probe_show(struct device *dev, > > } > > static DEVICE_ATTR_RO(wait_probe); > > > > +static ssize_t ars_rescan_store(struct device *dev, > > + struct device_attribute *attr, const char *buf, size_t size) > > +{ > > + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); > > + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; > > + int rc; > > + > > + if (nd_desc->ars_rescan) { > > + rc = nd_desc->ars_rescan(nd_desc); > > + if (rc) > > + return rc; > > + } > > + return size; > > +} > > +static DEVICE_ATTR_WO(ars_rescan); > > A few notes: > > 1/ ARS is unique to the nfit driver so let's make this nfit specific, > i.e. add it to acpi_nfit_attribute_group. > > 2/ Let's just call the attribute scrub and not distinguish it as "re-" > > 3/ Userspace may want to know when scanning is complete so let's make > this attribute read/write and on read return a count of the number of > completed scans since the driver was loaded. For notification of last > completion use sysfs_notify_dirent_safe() to make this scrub attribute > select()/poll() capable. Ok, sounds reasonable. > > > + > > static struct attribute *nvdimm_bus_attributes[] = { > > &dev_attr_commands.attr, > > &dev_attr_wait_probe.attr, > > &dev_attr_provider.attr, > > + &dev_attr_ars_rescan.attr, > > NULL, > > }; > > > > diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h > > index 0c3c30c..1c6867a 100644 > > --- a/include/linux/libnvdimm.h > > +++ b/include/linux/libnvdimm.h > > @@ -74,6 +74,7 @@ struct nvdimm_bus_descriptor { > > int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc); > > int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc, > > struct nvdimm *nvdimm, unsigned int cmd); > > + int (*ars_rescan)(struct nvdimm_bus_descriptor *nd_desc); > > }; > > > > struct nd_cmd_desc { > > -- > > 2.7.4 > >
On Tue, Jul 19, 2016 at 10:45 AM, Vishal Verma <vishal.l.verma@intel.com> wrote: > On 07/19, Dan Williams wrote: >> On Mon, Jul 18, 2016 at 5:44 PM, Vishal Verma <vishal.l.verma@intel.com> wrote: >> > Normally, an ARS (Address Range Scrub) only happens at >> > boot/initialization time. There can however arise situations where a >> > bus-wide rescan is needed - notably, in the case of discovering a latent >> > media error, we should do a full rescan to figure out what other sectors >> > are bad, and thus potentially avoid triggering an mce on them in the >> > future. Also provide a sysfs trigger to start a bus-wide rescan. >> > >> > Cc: Dan Williams <dan.j.williams@intel.com> >> > Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> >> > Cc: <linux-acpi@vger.kernel.org> >> > Cc: <linux-nvdimm@lists.01.org> >> > Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> >> > --- >> > drivers/acpi/nfit.c | 36 ++++++++++++++++++++++++++++++++---- >> > drivers/acpi/nfit.h | 1 + >> > drivers/nvdimm/core.c | 17 +++++++++++++++++ >> > include/linux/libnvdimm.h | 1 + >> > 4 files changed, 51 insertions(+), 4 deletions(-) >> > >> > diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c >> > index ac6ddcc0..def9505 100644 >> > --- a/drivers/acpi/nfit.c >> > +++ b/drivers/acpi/nfit.c >> > @@ -2138,8 +2138,9 @@ static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc, >> > unsigned int tmo = scrub_timeout; >> > int rc; >> > >> > - if (nfit_spa->ars_done || !nfit_spa->nd_region) >> > - return; >> > + if (!nfit_spa->ars_rescan) >> > + if (nfit_spa->ars_done || !nfit_spa->nd_region) >> > + return; >> >> Do we need a new flag? Why not just clear ->ars_done? > > This is what I had started out with - clearing the done flag, but the > done flag gets set at the end of acpi_nfit_scrub if a region has been > registered for that SPA. In the rescan case, we'll almost always have > our regions registered, so the done flag will get set here, and > acpi_nfit_async_scrub won't look at it at all.. Maybe just flip the polarity of ->ars_done to ->ars_do? Seems we should be able to get away with not adding a new flag.
On 07/19, Dan Williams wrote: > On Tue, Jul 19, 2016 at 10:45 AM, Vishal Verma <vishal.l.verma@intel.com> wrote: > > On 07/19, Dan Williams wrote: > >> On Mon, Jul 18, 2016 at 5:44 PM, Vishal Verma <vishal.l.verma@intel.com> wrote: > >> > Normally, an ARS (Address Range Scrub) only happens at > >> > boot/initialization time. There can however arise situations where a > >> > bus-wide rescan is needed - notably, in the case of discovering a latent > >> > media error, we should do a full rescan to figure out what other sectors > >> > are bad, and thus potentially avoid triggering an mce on them in the > >> > future. Also provide a sysfs trigger to start a bus-wide rescan. > >> > > >> > Cc: Dan Williams <dan.j.williams@intel.com> > >> > Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > >> > Cc: <linux-acpi@vger.kernel.org> > >> > Cc: <linux-nvdimm@lists.01.org> > >> > Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> > >> > --- > >> > drivers/acpi/nfit.c | 36 ++++++++++++++++++++++++++++++++---- > >> > drivers/acpi/nfit.h | 1 + > >> > drivers/nvdimm/core.c | 17 +++++++++++++++++ > >> > include/linux/libnvdimm.h | 1 + > >> > 4 files changed, 51 insertions(+), 4 deletions(-) > >> > > >> > diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c > >> > index ac6ddcc0..def9505 100644 > >> > --- a/drivers/acpi/nfit.c > >> > +++ b/drivers/acpi/nfit.c > >> > @@ -2138,8 +2138,9 @@ static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc, > >> > unsigned int tmo = scrub_timeout; > >> > int rc; > >> > > >> > - if (nfit_spa->ars_done || !nfit_spa->nd_region) > >> > - return; > >> > + if (!nfit_spa->ars_rescan) > >> > + if (nfit_spa->ars_done || !nfit_spa->nd_region) > >> > + return; > >> > >> Do we need a new flag? Why not just clear ->ars_done? > > > > This is what I had started out with - clearing the done flag, but the > > done flag gets set at the end of acpi_nfit_scrub if a region has been > > registered for that SPA. In the rescan case, we'll almost always have > > our regions registered, so the done flag will get set here, and > > acpi_nfit_async_scrub won't look at it at all.. > > Maybe just flip the polarity of ->ars_done to ->ars_do? Seems we > should be able to get away with not adding a new flag. Will it make a difference? We essentially use the do/done flag to decide which SPAs need further ARS work, i.e. ars_nfit_async_scrub. When we're running at init time, the SPAs that need to go into _async_scrub can be a subset of all SPAs because for some of them, the scrub may be complete, and we may have valid results. For the rescan case, _all_ SPAs need to be _async_scrub 'ed. Unless we change the initilization case to also start ARS for all SPAs irrespective of whether we found good results or not, I'm not sure I see how we can reuse the same flag?
diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c index ac6ddcc0..def9505 100644 --- a/drivers/acpi/nfit.c +++ b/drivers/acpi/nfit.c @@ -2138,8 +2138,9 @@ static void acpi_nfit_async_scrub(struct acpi_nfit_desc *acpi_desc, unsigned int tmo = scrub_timeout; int rc; - if (nfit_spa->ars_done || !nfit_spa->nd_region) - return; + if (!nfit_spa->ars_rescan) + if (nfit_spa->ars_done || !nfit_spa->nd_region) + return; rc = ars_start(acpi_desc, nfit_spa); /* @@ -2227,7 +2228,9 @@ static void acpi_nfit_scrub(struct work_struct *work) * firmware initiated scrubs to complete and then we go search for the * affected spa regions to mark them scanned. In the second phase we * initiate a directed scrub for every range that was not scrubbed in - * phase 1. + * phase 1. If we're called for a 'rescan', we harmlessly pass through + * the first phase, but really only care about running phase 2, where + * regions can be notified of new poison. */ /* process platform firmware initiated scrubs */ @@ -2336,8 +2339,10 @@ static void acpi_nfit_scrub(struct work_struct *work) acpi_nfit_register_region(acpi_desc, nfit_spa); } - list_for_each_entry(nfit_spa, &acpi_desc->spas, list) + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { acpi_nfit_async_scrub(acpi_desc, nfit_spa); + nfit_spa->ars_rescan = 0; + } mutex_unlock(&acpi_desc->init_mutex); } @@ -2495,6 +2500,28 @@ static int acpi_nfit_clear_to_send(struct nvdimm_bus_descriptor *nd_desc, return 0; } +static int acpi_nfit_ars_rescan(struct nvdimm_bus_descriptor *nd_desc) +{ + struct acpi_nfit_desc *acpi_desc = to_acpi_nfit_desc(nd_desc); + struct device *dev = acpi_desc->dev; + struct nfit_spa *nfit_spa; + + if (work_busy(&acpi_desc->work)) + return -EBUSY; + + list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { + struct acpi_nfit_system_address *spa = nfit_spa->spa; + + if (nfit_spa_type(spa) != NFIT_SPA_PM) + continue; + + nfit_spa->ars_rescan = 1; + } + queue_work(nfit_wq, &acpi_desc->work); + dev_info(dev, "%s: ars_rescan triggered\n", __func__); + return 0; +} + void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) { struct nvdimm_bus_descriptor *nd_desc; @@ -2507,6 +2534,7 @@ void acpi_nfit_desc_init(struct acpi_nfit_desc *acpi_desc, struct device *dev) nd_desc->ndctl = acpi_nfit_ctl; nd_desc->flush_probe = acpi_nfit_flush_probe; nd_desc->clear_to_send = acpi_nfit_clear_to_send; + nd_desc->ars_rescan = acpi_nfit_ars_rescan; nd_desc->attr_groups = acpi_nfit_attribute_groups; INIT_LIST_HEAD(&acpi_desc->spa_maps); diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h index 02b9ea1..db95c5d 100644 --- a/drivers/acpi/nfit.h +++ b/drivers/acpi/nfit.h @@ -78,6 +78,7 @@ struct nfit_spa { struct list_head list; struct nd_region *nd_region; unsigned int ars_done:1; + unsigned int ars_rescan:1; u32 clear_err_unit; u32 max_ars; }; diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c index be89764..54f6fd5 100644 --- a/drivers/nvdimm/core.c +++ b/drivers/nvdimm/core.c @@ -313,10 +313,27 @@ static ssize_t wait_probe_show(struct device *dev, } static DEVICE_ATTR_RO(wait_probe); +static ssize_t ars_rescan_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; + int rc; + + if (nd_desc->ars_rescan) { + rc = nd_desc->ars_rescan(nd_desc); + if (rc) + return rc; + } + return size; +} +static DEVICE_ATTR_WO(ars_rescan); + static struct attribute *nvdimm_bus_attributes[] = { &dev_attr_commands.attr, &dev_attr_wait_probe.attr, &dev_attr_provider.attr, + &dev_attr_ars_rescan.attr, NULL, }; diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index 0c3c30c..1c6867a 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -74,6 +74,7 @@ struct nvdimm_bus_descriptor { int (*flush_probe)(struct nvdimm_bus_descriptor *nd_desc); int (*clear_to_send)(struct nvdimm_bus_descriptor *nd_desc, struct nvdimm *nvdimm, unsigned int cmd); + int (*ars_rescan)(struct nvdimm_bus_descriptor *nd_desc); }; struct nd_cmd_desc {
Normally, an ARS (Address Range Scrub) only happens at boot/initialization time. There can however arise situations where a bus-wide rescan is needed - notably, in the case of discovering a latent media error, we should do a full rescan to figure out what other sectors are bad, and thus potentially avoid triggering an mce on them in the future. Also provide a sysfs trigger to start a bus-wide rescan. Cc: Dan Williams <dan.j.williams@intel.com> Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Cc: <linux-acpi@vger.kernel.org> Cc: <linux-nvdimm@lists.01.org> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com> --- drivers/acpi/nfit.c | 36 ++++++++++++++++++++++++++++++++---- drivers/acpi/nfit.h | 1 + drivers/nvdimm/core.c | 17 +++++++++++++++++ include/linux/libnvdimm.h | 1 + 4 files changed, 51 insertions(+), 4 deletions(-)