From ce5cbf53496bfebe1b7478a532820373342e8302 Mon Sep 17 00:00:00 2001 From: Erik Schmauss Date: Tue, 5 Feb 2019 16:14:00 -0800 Subject: ACPI: Set debug output flags independent of ACPICA There was a divergence between Linux and ACPICA on the definition of ACPI_DEBUG_DEFAULT. This divergence was solved by taking ACPICA's definition in 4c1379d7bb42. After resolving the divergence, it was clear that Linux users wanted to use their old set of debug flags. This change fixes the divergence by setting these debug flags during acpi_early_init() rather than during global variable initialization in acpixf.h (owned by ACPICA). Fixes: 4c1379d7bb42 ("ACPICA: Debug output: Add option to display method/object evaluation") Reported-by: Michael J Ruhl Reported-by: Alex Gagniuc Signed-off-by: Erik Schmauss Signed-off-by: Rafael J. Wysocki --- drivers/acpi/bus.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/acpi') diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 5c093ce01bcd..147f6c7ea59c 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -1029,6 +1029,9 @@ void __init acpi_early_init(void) acpi_permanent_mmap = true; + /* Initialize debug output. Linux does not use ACPICA defaults */ + acpi_dbg_level = ACPI_LV_INFO | ACPI_LV_REPAIR; + #ifdef CONFIG_X86 /* * If the machine falls into the DMI check table, -- cgit v1.2.3 From c6c5df293bf1b488cf8459aac658aecfdccb13a9 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 13 Feb 2019 08:58:40 -0800 Subject: nfit/ars: Attempt a short-ARS whenever the ARS state is idle at boot If query-ARS reports that ARS has stopped and requires continuation attempt to retrieve short-ARS results before continuing the long operation. Fixes: bc6ba8085842 ("nfit, address-range-scrub: rework and simplify ARS...") Cc: Reported-by: Krzysztof Rusocki Reviewed-by: Toshi Kani Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index e18ade5d74e9..3d681a92ff7f 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -3012,6 +3012,7 @@ static int ars_register(struct acpi_nfit_desc *acpi_desc, switch (acpi_nfit_query_poison(acpi_desc)) { case 0: + case -ENOSPC: case -EAGAIN: rc = ars_start(acpi_desc, nfit_spa, ARS_REQ_SHORT); /* shouldn't happen, try again later */ @@ -3036,7 +3037,6 @@ static int ars_register(struct acpi_nfit_desc *acpi_desc, break; case -EBUSY: case -ENOMEM: - case -ENOSPC: /* * BIOS was using ARS, wait for it to complete (or * resources to become available) and then perform our -- cgit v1.2.3 From fa3ed4d981b1fc19acdd07fcb152a4bd3706892b Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 13 Feb 2019 09:01:13 -0800 Subject: nfit/ars: Attempt short-ARS even in the no_init_ars case The no_init_ars option is meant to prevent long-ARS, but short-ARS should be allowed to grab any immediate results. Fixes: bc6ba8085842 ("nfit, address-range-scrub: rework and simplify ARS...") Cc: Reported-by: Erwin Tsaur Reviewed-by: Toshi Kani Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 3d681a92ff7f..934be96dc149 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -3004,11 +3004,12 @@ static int ars_register(struct acpi_nfit_desc *acpi_desc, { int rc; - if (no_init_ars || test_bit(ARS_FAILED, &nfit_spa->ars_state)) + if (test_bit(ARS_FAILED, &nfit_spa->ars_state)) return acpi_nfit_register_region(acpi_desc, nfit_spa); set_bit(ARS_REQ_SHORT, &nfit_spa->ars_state); - set_bit(ARS_REQ_LONG, &nfit_spa->ars_state); + if (!no_init_ars) + set_bit(ARS_REQ_LONG, &nfit_spa->ars_state); switch (acpi_nfit_query_poison(acpi_desc)) { case 0: -- cgit v1.2.3 From 317a992ab9266b86b774b9f6b0f87eb4f59879a1 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 13 Feb 2019 09:34:00 -0800 Subject: nfit/ars: Remove ars_start_flags The ars_start_flags property of 'struct acpi_nfit_desc' is no longer used since ARS_REQ_SHORT and ARS_REQ_LONG were added. Reviewed-by: Toshi Kani Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 10 +++++----- drivers/acpi/nfit/nfit.h | 1 - 2 files changed, 5 insertions(+), 6 deletions(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 934be96dc149..9a23ae74e82b 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -2651,11 +2651,11 @@ static int ars_continue(struct acpi_nfit_desc *acpi_desc) struct nvdimm_bus_descriptor *nd_desc = &acpi_desc->nd_desc; struct nd_cmd_ars_status *ars_status = acpi_desc->ars_status; - memset(&ars_start, 0, sizeof(ars_start)); - ars_start.address = ars_status->restart_address; - ars_start.length = ars_status->restart_length; - ars_start.type = ars_status->type; - ars_start.flags = acpi_desc->ars_start_flags; + ars_start = (struct nd_cmd_ars_start) { + .address = ars_status->restart_address, + .length = ars_status->restart_length, + .type = ars_status->type, + }; rc = nd_desc->ndctl(nd_desc, NULL, ND_CMD_ARS_START, &ars_start, sizeof(ars_start), &cmd_rc); if (rc < 0) diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index 33691aecfcee..871fb3de3b30 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -223,7 +223,6 @@ struct acpi_nfit_desc { struct list_head idts; struct nvdimm_bus *nvdimm_bus; struct device *dev; - u8 ars_start_flags; struct nd_cmd_ars_status *ars_status; struct nfit_spa *scrub_spa; struct delayed_work dwork; -- cgit v1.2.3 From e34b8252a3d2893ca55c82dbfcdaa302fa03d400 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 13 Feb 2019 09:57:22 -0800 Subject: nfit/ars: Introduce scrub_flags In preparation for introducing new flags to gate whether ARS results are stale, or poll the completion state, convert the existing flags to an unsigned long with enumerated values. This conversion allows the flags to be atomically updated outside of ->init_mutex. Reviewed-by: Toshi Kani Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 30 +++++++++++++++++------------- drivers/acpi/nfit/nfit.h | 8 ++++++-- 2 files changed, 23 insertions(+), 15 deletions(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 9a23ae74e82b..90312892093e 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1317,19 +1317,23 @@ static ssize_t scrub_show(struct device *dev, struct device_attribute *attr, char *buf) { struct nvdimm_bus_descriptor *nd_desc; + struct acpi_nfit_desc *acpi_desc; ssize_t rc = -ENXIO; + bool busy; device_lock(dev); nd_desc = dev_get_drvdata(dev); - if (nd_desc) { - struct acpi_nfit_desc *acpi_desc = to_acpi_desc(nd_desc); - - mutex_lock(&acpi_desc->init_mutex); - rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, - acpi_desc->scrub_busy - && !acpi_desc->cancel ? "+\n" : "\n"); - mutex_unlock(&acpi_desc->init_mutex); + if (!nd_desc) { + device_unlock(dev); + return rc; } + acpi_desc = to_acpi_desc(nd_desc); + + mutex_lock(&acpi_desc->init_mutex); + busy = test_bit(ARS_BUSY, &acpi_desc->scrub_flags) + && !test_bit(ARS_CANCEL, &acpi_desc->scrub_flags); + rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, busy ? "+\n" : "\n"); + mutex_unlock(&acpi_desc->init_mutex); device_unlock(dev); return rc; } @@ -3072,7 +3076,7 @@ static unsigned int __acpi_nfit_scrub(struct acpi_nfit_desc *acpi_desc, lockdep_assert_held(&acpi_desc->init_mutex); - if (acpi_desc->cancel) + if (test_bit(ARS_CANCEL, &acpi_desc->scrub_flags)) return 0; if (query_rc == -EBUSY) { @@ -3146,7 +3150,7 @@ static void __sched_ars(struct acpi_nfit_desc *acpi_desc, unsigned int tmo) { lockdep_assert_held(&acpi_desc->init_mutex); - acpi_desc->scrub_busy = 1; + set_bit(ARS_BUSY, &acpi_desc->scrub_flags); /* note this should only be set from within the workqueue */ if (tmo) acpi_desc->scrub_tmo = tmo; @@ -3162,7 +3166,7 @@ static void notify_ars_done(struct acpi_nfit_desc *acpi_desc) { lockdep_assert_held(&acpi_desc->init_mutex); - acpi_desc->scrub_busy = 0; + clear_bit(ARS_BUSY, &acpi_desc->scrub_flags); acpi_desc->scrub_count++; if (acpi_desc->scrub_count_state) sysfs_notify_dirent(acpi_desc->scrub_count_state); @@ -3451,7 +3455,7 @@ int acpi_nfit_ars_rescan(struct acpi_nfit_desc *acpi_desc, struct nfit_spa *nfit_spa; mutex_lock(&acpi_desc->init_mutex); - if (acpi_desc->cancel) { + if (test_bit(ARS_CANCEL, &acpi_desc->scrub_flags)) { mutex_unlock(&acpi_desc->init_mutex); return 0; } @@ -3530,7 +3534,7 @@ void acpi_nfit_shutdown(void *data) mutex_unlock(&acpi_desc_lock); mutex_lock(&acpi_desc->init_mutex); - acpi_desc->cancel = 1; + set_bit(ARS_CANCEL, &acpi_desc->scrub_flags); cancel_delayed_work_sync(&acpi_desc->dwork); mutex_unlock(&acpi_desc->init_mutex); diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index 871fb3de3b30..897ce10192a0 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -210,6 +210,11 @@ struct nfit_mem { int family; }; +enum scrub_flags { + ARS_BUSY, + ARS_CANCEL, +}; + struct acpi_nfit_desc { struct nvdimm_bus_descriptor nd_desc; struct acpi_table_header acpi_header; @@ -231,8 +236,7 @@ struct acpi_nfit_desc { unsigned int max_ars; unsigned int scrub_count; unsigned int scrub_mode; - unsigned int scrub_busy:1; - unsigned int cancel:1; + unsigned long scrub_flags; unsigned long dimm_cmd_force_en; unsigned long bus_cmd_force_en; unsigned long bus_nfit_cmd_force_en; -- cgit v1.2.3 From 5479b2757f26fe9908fc341d105b2097fe820b6f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 13 Feb 2019 09:04:07 -0800 Subject: nfit/ars: Allow root to busy-poll the ARS state machine The ARS implementation implements exponential back-off on the poll interval to prevent high-frequency access to the DIMM / platform interface. Depending on when the ARS completes the poll interval may exceed the completion event by minutes. Allow root to reset the timeout each time it probes the status. A one-second timeout is still enforced, but root can otherwise can control the poll interval. Fixes: bc6ba8085842 ("nfit, address-range-scrub: rework and simplify ARS...") Cc: Reported-by: Erwin Tsaur Reviewed-by: Toshi Kani Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 8 ++++++++ drivers/acpi/nfit/nfit.h | 1 + 2 files changed, 9 insertions(+) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 90312892093e..629cf91649d2 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -1333,6 +1333,13 @@ static ssize_t scrub_show(struct device *dev, busy = test_bit(ARS_BUSY, &acpi_desc->scrub_flags) && !test_bit(ARS_CANCEL, &acpi_desc->scrub_flags); rc = sprintf(buf, "%d%s", acpi_desc->scrub_count, busy ? "+\n" : "\n"); + /* Allow an admin to poll the busy state at a higher rate */ + if (busy && capable(CAP_SYS_RAWIO) && !test_and_set_bit(ARS_POLL, + &acpi_desc->scrub_flags)) { + acpi_desc->scrub_tmo = 1; + mod_delayed_work(nfit_wq, &acpi_desc->dwork, HZ); + } + mutex_unlock(&acpi_desc->init_mutex); device_unlock(dev); return rc; @@ -3187,6 +3194,7 @@ static void acpi_nfit_scrub(struct work_struct *work) else notify_ars_done(acpi_desc); memset(acpi_desc->ars_status, 0, acpi_desc->max_ars); + clear_bit(ARS_POLL, &acpi_desc->scrub_flags); mutex_unlock(&acpi_desc->init_mutex); } diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index 897ce10192a0..d14bad687fb8 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -213,6 +213,7 @@ struct nfit_mem { enum scrub_flags { ARS_BUSY, ARS_CANCEL, + ARS_POLL, }; struct acpi_nfit_desc { -- cgit v1.2.3 From 78153dd45e7e0596ba32b15d02bda08e1513111e Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 13 Feb 2019 09:28:40 -0800 Subject: nfit/ars: Avoid stale ARS results Gate ARS result consumption on whether the OS issued start-ARS since the previous consumption. The BIOS may only clear its result buffers after a successful start-ARS. Fixes: 0caeef63e6d2 ("libnvdimm: Add a poison list and export badblocks") Cc: Reported-by: Krzysztof Rusocki Reported-by: Vishal Verma Reviewed-by: Toshi Kani Signed-off-by: Dan Williams --- drivers/acpi/nfit/core.c | 17 ++++++++++++++++- drivers/acpi/nfit/nfit.h | 1 + 2 files changed, 17 insertions(+), 1 deletion(-) (limited to 'drivers/acpi') diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index 629cf91649d2..5c9eb8d700d3 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -2652,7 +2652,10 @@ static int ars_start(struct acpi_nfit_desc *acpi_desc, if (rc < 0) return rc; - return cmd_rc; + if (cmd_rc < 0) + return cmd_rc; + set_bit(ARS_VALID, &acpi_desc->scrub_flags); + return 0; } static int ars_continue(struct acpi_nfit_desc *acpi_desc) @@ -2745,6 +2748,17 @@ static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc) */ if (ars_status->out_length < 44) return 0; + + /* + * Ignore potentially stale results that are only refreshed + * after a start-ARS event. + */ + if (!test_and_clear_bit(ARS_VALID, &acpi_desc->scrub_flags)) { + dev_dbg(acpi_desc->dev, "skip %d stale records\n", + ars_status->num_records); + return 0; + } + for (i = 0; i < ars_status->num_records; i++) { /* only process full records */ if (ars_status->out_length @@ -3229,6 +3243,7 @@ static int acpi_nfit_register_regions(struct acpi_nfit_desc *acpi_desc) struct nfit_spa *nfit_spa; int rc; + set_bit(ARS_VALID, &acpi_desc->scrub_flags); list_for_each_entry(nfit_spa, &acpi_desc->spas, list) { switch (nfit_spa_type(nfit_spa->spa)) { case NFIT_SPA_VOLATILE: diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h index d14bad687fb8..0cbe5009eb2c 100644 --- a/drivers/acpi/nfit/nfit.h +++ b/drivers/acpi/nfit/nfit.h @@ -213,6 +213,7 @@ struct nfit_mem { enum scrub_flags { ARS_BUSY, ARS_CANCEL, + ARS_VALID, ARS_POLL, }; -- cgit v1.2.3