acpi/nfit: Add support of NVDIMM memory error notification in ACPI 6.2

ACPI 6.2 defines a new ACPI notification value to NVDIMM Root Device
in Table 5-169.

 0x81 Unconsumed Uncorrectable Memory Error Detected
      Used to pro-actively notify OSPM of uncorrectable memory errors
      detected (for example a memory scrubbing engine that continuously
      scans the NVDIMMs memory). This is an optional notification. Only
      locations that were mapped in to SPA by the platform will generate
      a notification.

Add support of this notification value by initiating an ARS scan. This
will find new error locations and add their badblocks information.

Link: http://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Vishal Verma <vishal.l.verma@intel.com>
Cc: Linda Knippers <linda.knippers@hpe.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

2 files changed, 23 insertions, 6 deletions

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index b930d12f636b..facbc6107165 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -3016,7 +3016,7 @@ static int acpi_nfit_remove(struct acpi_device *adev)
         return 0;
 }
 
-void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
+static void acpi_nfit_update_notify(struct device *dev, acpi_handle handle)
 {
         struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
         struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -3024,11 +3024,6 @@ void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
         acpi_status status;
         int ret;
 
-        dev_dbg(dev, "%s: event: %d\n", __func__, event);
-
-        if (event != NFIT_NOTIFY_UPDATE)
-                return;
-
         if (!dev->driver) {
                 /* dev->driver may be null if we're being removed */
                 dev_dbg(dev, "%s: no driver found for dev\n", __func__);
@@ -3065,6 +3060,27 @@ void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
                 dev_err(dev, "Invalid _FIT\n");
         kfree(buf.pointer);
 }
+
+static void acpi_nfit_uc_error_notify(struct device *dev, acpi_handle handle)
+{
+        struct acpi_nfit_desc *acpi_desc = dev_get_drvdata(dev);
+
+        acpi_nfit_ars_rescan(acpi_desc);
+}
+
+void __acpi_nfit_notify(struct device *dev, acpi_handle handle, u32 event)
+{
+        dev_dbg(dev, "%s: event: 0x%x\n", __func__, event);
+
+        switch (event) {
+        case NFIT_NOTIFY_UPDATE:
+                return acpi_nfit_update_notify(dev, handle);
+        case NFIT_NOTIFY_UC_MEMORY_ERROR:
+                return acpi_nfit_uc_error_notify(dev, handle);
+        default:
+                return;
+        }
+}
 EXPORT_SYMBOL_GPL(__acpi_nfit_notify);
 
 static void acpi_nfit_notify(struct acpi_device *adev, u32 event)
diff --git a/drivers/acpi/nfit/nfit.h b/drivers/acpi/nfit/nfit.h
index 29bdd959517f..e3da60b2d686 100644
--- a/drivers/acpi/nfit/nfit.h
+++ b/drivers/acpi/nfit/nfit.h
@@ -79,6 +79,7 @@ enum {
 
 enum nfit_root_notifiers {
         NFIT_NOTIFY_UPDATE = 0x80,
+        NFIT_NOTIFY_UC_MEMORY_ERROR = 0x81,
 };
 
 enum nfit_dimm_notifiers {