#include <linux/acpi_io.h>
#include <acpi/acpiosxf.h>
+/* ACPI NVS regions, APEI may use it */
+
+struct nvs_region {
+ __u64 phys_start;
+ __u64 size;
+ struct list_head node;
+};
+
+static LIST_HEAD(nvs_region_list);
+
+#ifdef CONFIG_ACPI_SLEEP
+static int suspend_nvs_register(unsigned long start, unsigned long size);
+#else
+static inline int suspend_nvs_register(unsigned long a, unsigned long b)
+{
+ return 0;
+}
+#endif
+
+int acpi_nvs_register(__u64 start, __u64 size)
+{
+ struct nvs_region *region;
+
+ region = kmalloc(sizeof(*region), GFP_KERNEL);
+ if (!region)
+ return -ENOMEM;
+ region->phys_start = start;
+ region->size = size;
+ list_add_tail(®ion->node, &nvs_region_list);
+
+ return suspend_nvs_register(start, size);
+}
+
+int acpi_nvs_for_each_region(int (*func)(__u64 start, __u64 size, void *data),
+ void *data)
+{
+ int rc;
+ struct nvs_region *region;
+
+ list_for_each_entry(region, &nvs_region_list, node) {
+ rc = func(region->phys_start, region->size, data);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+
+#ifdef CONFIG_ACPI_SLEEP
/*
* Platforms, like ACPI, may want us to save some memory used by them during
* suspend and to restore the contents of this memory during the subsequent
unsigned int size;
void *kaddr;
void *data;
+ bool unmap;
struct list_head node;
};
* things so that the data from page-aligned addresses in this region will
* be copied into separate RAM pages.
*/
-int suspend_nvs_register(unsigned long start, unsigned long size)
+static int suspend_nvs_register(unsigned long start, unsigned long size)
{
struct nvs_page *entry, *next;
+ pr_info("PM: Registering ACPI NVS region at %lx (%ld bytes)\n",
+ start, size);
+
while (size > 0) {
unsigned int nr_bytes;
free_page((unsigned long)entry->data);
entry->data = NULL;
if (entry->kaddr) {
- iounmap(entry->kaddr);
+ if (entry->unmap) {
+ iounmap(entry->kaddr);
+ entry->unmap = false;
+ } else {
+ acpi_os_unmap_memory(entry->kaddr,
+ entry->size);
+ }
entry->kaddr = NULL;
}
}
list_for_each_entry(entry, &nvs_list, node)
if (entry->data) {
- entry->kaddr = acpi_os_ioremap(entry->phys_start,
- entry->size);
+ unsigned long phys = entry->phys_start;
+ unsigned int size = entry->size;
+
+ entry->kaddr = acpi_os_get_iomem(phys, size);
+ if (!entry->kaddr) {
+ entry->kaddr = acpi_os_ioremap(phys, size);
+ entry->unmap = !!entry->kaddr;
+ }
if (!entry->kaddr) {
suspend_nvs_free();
return -ENOMEM;
if (entry->data)
memcpy(entry->kaddr, entry->data, entry->size);
}
+#endif