e820, efi: add ACPI 6.0 persistent memory types

ACPI 6.0 formalizes e820-type-7 and efi-type-14 as persistent memory.
Mark it "reserved" and allow it to be claimed by a persistent memory
device driver.

This definition is in addition to the Linux kernel's existing type-12
definition that was recently added in support of shipping platforms with
NVDIMM support that predate ACPI 6.0 (which now classifies type-12 as
OEM reserved).

Note, /proc/iomem can be consulted for differentiating legacy
"Persistent Memory (legacy)" E820_PRAM vs standard "Persistent Memory"
E820_PMEM.

Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

arch/arm64/kernel/efi.c

@@ -158,6 +158,7 @@ static __init int is_reserve_region(efi_memory_desc_t *md)
 	case EFI_BOOT_SERVICES_CODE:
 	case EFI_BOOT_SERVICES_DATA:
 	case EFI_CONVENTIONAL_MEMORY:
+	case EFI_PERSISTENT_MEMORY:
 		return 0;
 	default:
 		break;

arch/ia64/kernel/efi.c

@@ -1223,6 +1223,10 @@ efi_initialize_iomem_resources(struct resource *code_resource,
 				flags |= IORESOURCE_DISABLED;
 				break;
 
+			case EFI_PERSISTENT_MEMORY:
+				name = "Persistent Memory";
+				break;
+
 			case EFI_RESERVED_TYPE:
 			case EFI_RUNTIME_SERVICES_CODE:
 			case EFI_RUNTIME_SERVICES_DATA:

arch/x86/boot/compressed/eboot.c

@@ -1224,6 +1224,10 @@ static efi_status_t setup_e820(struct boot_params *params,
 			e820_type = E820_NVS;
 			break;
 
+		case EFI_PERSISTENT_MEMORY:
+			e820_type = E820_PMEM;
+			break;
+
 		default:
 			continue;
 		}

arch/x86/include/uapi/asm/e820.h

@@ -32,6 +32,7 @@
 #define E820_ACPI	3
 #define E820_NVS	4
 #define E820_UNUSABLE	5
+#define E820_PMEM	7
 
 /*
  * This is a non-standardized way to represent ADR or NVDIMM regions that

arch/x86/kernel/e820.c

@@ -149,6 +149,7 @@ static void __init e820_print_type(u32 type)
 	case E820_UNUSABLE:
 		printk(KERN_CONT "unusable");
 		break;
+	case E820_PMEM:
 	case E820_PRAM:
 		printk(KERN_CONT "persistent (type %u)", type);
 		break;
@@ -918,11 +919,32 @@ static inline const char *e820_type_to_string(int e820_type)
 	case E820_ACPI:	return "ACPI Tables";
 	case E820_NVS:	return "ACPI Non-volatile Storage";
 	case E820_UNUSABLE:	return "Unusable memory";
-	case E820_PRAM: return "Persistent RAM";
+	case E820_PRAM: return "Persistent Memory (legacy)";
+	case E820_PMEM: return "Persistent Memory";
 	default:	return "reserved";
 	}
 }
 
+static bool do_mark_busy(u32 type, struct resource *res)
+{
+	/* this is the legacy bios/dos rom-shadow + mmio region */
+	if (res->start < (1ULL<<20))
+		return true;
+
+	/*
+	 * Treat persistent memory like device memory, i.e. reserve it
+	 * for exclusive use of a driver
+	 */
+	switch (type) {
+	case E820_RESERVED:
+	case E820_PRAM:
+	case E820_PMEM:
+		return false;
+	default:
+		return true;
+	}
+}
+
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
@@ -952,9 +974,7 @@ void __init e820_reserve_resources(void)
 		 * pci device BAR resource and insert them later in
 		 * pcibios_resource_survey()
 		 */
-		if (((e820.map[i].type != E820_RESERVED) &&
-		     (e820.map[i].type != E820_PRAM)) ||
-		     res->start < (1ULL<<20)) {
+		if (do_mark_busy(e820.map[i].type, res)) {
 			res->flags |= IORESOURCE_BUSY;
 			insert_resource(&iomem_resource, res);
 		}

arch/x86/platform/efi/efi.c

@@ -153,6 +153,9 @@ static void __init do_add_efi_memmap(void)
 		case EFI_UNUSABLE_MEMORY:
 			e820_type = E820_UNUSABLE;
 			break;
+		case EFI_PERSISTENT_MEMORY:
+			e820_type = E820_PMEM;
+			break;
 		default:
 			/*
 			 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE

include/linux/efi.h

@@ -85,7 +85,8 @@ typedef	struct {
 #define EFI_MEMORY_MAPPED_IO		11
 #define EFI_MEMORY_MAPPED_IO_PORT_SPACE	12
 #define EFI_PAL_CODE			13
-#define EFI_MAX_MEMORY_TYPE		14
+#define EFI_PERSISTENT_MEMORY		14
+#define EFI_MAX_MEMORY_TYPE		15
 
 /* Attribute values: */
 #define EFI_MEMORY_UC		((u64)0x0000000000000001ULL)	/* uncached */