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 <toshi.kani@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 9a23ae74e82b583127f325255e05553965e3f514..90312892093e1d3848cda6da432db1c25de25d79 100644 (file)
--- 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 871fb3de3b307c4980acd31171aaee2b2e3eba48..897ce10192a076b0359954f17d92e19007adebad 100644 (file)
--- 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;