ACPI, Record ACPI NVS regions

Some firmware will access memory in ACPI NVS region via APEI.  That
is, instructions in APEI ERST/EINJ table will read/write ACPI NVS
region.  The original resource conflict checking in APEI code will
check memory/ioport accessed by APEI via general resource management
mechanism.  But ACPI NVS region is marked as busy already, so that the
false resource conflict will prevent APEI ERST/EINJ to work.

To fix this, this patch record ACPI NVS regions, so that we can avoid
request resources for memory region inside it.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 14 insertions, 6 deletions

diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 6001b4da39dd..26b75442ff7a 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -306,6 +306,11 @@ extern acpi_status acpi_pci_osc_control_set(acpi_handle handle,
                                              u32 *mask, u32 req);
 extern void acpi_early_init(void);
 
+extern int acpi_nvs_register(__u64 start, __u64 size);
+
+extern int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
+                                    void *data);
+
 #else   /* !CONFIG_ACPI */
 
 #define acpi_disabled 1
@@ -348,15 +353,18 @@ static inline int acpi_table_parse(char *id,
 {
         return -1;
 }
-#endif  /* !CONFIG_ACPI */
 
-#ifdef CONFIG_ACPI_SLEEP
-int suspend_nvs_register(unsigned long start, unsigned long size);
-#else
-static inline int suspend_nvs_register(unsigned long a, unsigned long b)
+static inline int acpi_nvs_register(__u64 start, __u64 size)
 {
         return 0;
 }
-#endif
+
+static inline int acpi_nvs_for_each_region(int (*func)(__u64, __u64, void *),
+                                           void *data)
+{
+        return 0;
+}
+
+#endif  /* !CONFIG_ACPI */
 
 #endif  /*_LINUX_ACPI_H*/