Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux

This includes initial support for the recently published ACPI 5.0 spec.
In particular, support for the "hardware-reduced" bit that eliminates
the dependency on legacy hardware.

APEI has patches resulting from testing on real hardware.

Plus other random fixes.

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux: (52 commits)
  acpi/apei/einj: Add extensions to EINJ from rev 5.0 of acpi spec
  intel_idle: Split up and provide per CPU initialization func
  ACPI processor: Remove unneeded variable passed by acpi_processor_hotadd_init V2
  ACPI processor: Remove unneeded cpuidle_unregister_driver call
  intel idle: Make idle driver more robust
  intel_idle: Fix a cast to pointer from integer of different size warning in intel_idle
  ACPI: kernel-parameters.txt : Add intel_idle.max_cstate
  intel_idle: remove redundant local_irq_disable() call
  ACPI processor: Fix error path, also remove sysdev link
  ACPI: processor: fix acpi_get_cpuid for UP processor
  intel_idle: fix API misuse
  ACPI APEI: Convert atomicio routines
  ACPI: Export interfaces for ioremapping/iounmapping ACPI registers
  ACPI: Fix possible alignment issues with GAS 'address' references
  ACPI, ia64: Use SRAT table rev to use 8bit or 16/32bit PXM fields (ia64)
  ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64)
  ACPI: Store SRAT table revision
  ACPI, APEI, Resolve false conflict between ACPI NVS and APEI
  ACPI, Record ACPI NVS regions
  ACPI, APEI, EINJ, Refine the fix of resource conflict
  ...

1 files changed, 139 insertions, 11 deletions

diff --git a/drivers/acpi/apei/apei-base.c b/drivers/acpi/apei/apei-base.c
index 61540360d5c..e45350cb6ac 100644
--- a/drivers/acpi/apei/apei-base.c
+++ b/drivers/acpi/apei/apei-base.c
@@ -34,13 +34,13 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/acpi.h>
+#include <linux/acpi_io.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/kref.h>
 #include <linux/rculist.h>
 #include <linux/interrupt.h>
 #include <linux/debugfs.h>
-#include <acpi/atomicio.h>
 
 #include "apei-internal.h"
 
@@ -70,7 +70,7 @@ int __apei_exec_read_register(struct acpi_whea_header *entry, u64 *val)
 {
 	int rc;
 
-	rc = acpi_atomic_read(val, &entry->register_region);
+	rc = apei_read(val, &entry->register_region);
 	if (rc)
 		return rc;
 	*val >>= entry->register_region.bit_offset;
@@ -116,13 +116,13 @@ int __apei_exec_write_register(struct acpi_whea_header *entry, u64 val)
 	val <<= entry->register_region.bit_offset;
 	if (entry->flags & APEI_EXEC_PRESERVE_REGISTER) {
 		u64 valr = 0;
-		rc = acpi_atomic_read(&valr, &entry->register_region);
+		rc = apei_read(&valr, &entry->register_region);
 		if (rc)
 			return rc;
 		valr &= ~(entry->mask << entry->register_region.bit_offset);
 		val |= valr;
 	}
-	rc = acpi_atomic_write(val, &entry->register_region);
+	rc = apei_write(val, &entry->register_region);
 
 	return rc;
 }
@@ -243,7 +243,7 @@ static int pre_map_gar_callback(struct apei_exec_context *ctx,
 	u8 ins = entry->instruction;
 
 	if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER)
-		return acpi_pre_map_gar(&entry->register_region);
+		return acpi_os_map_generic_address(&entry->register_region);
 
 	return 0;
 }
@@ -276,7 +276,7 @@ static int post_unmap_gar_callback(struct apei_exec_context *ctx,
 	u8 ins = entry->instruction;
 
 	if (ctx->ins_table[ins].flags & APEI_EXEC_INS_ACCESS_REGISTER)
-		acpi_post_unmap_gar(&entry->register_region);
+		acpi_os_unmap_generic_address(&entry->register_region);
 
 	return 0;
 }
@@ -421,6 +421,17 @@ static int apei_resources_merge(struct apei_resources *resources1,
 	return 0;
 }
 
+int apei_resources_add(struct apei_resources *resources,
+		       unsigned long start, unsigned long size,
+		       bool iomem)
+{
+	if (iomem)
+		return apei_res_add(&resources->iomem, start, size);
+	else
+		return apei_res_add(&resources->ioport, start, size);
+}
+EXPORT_SYMBOL_GPL(apei_resources_add);
+
 /*
  * EINJ has two groups of GARs (EINJ table entry and trigger table
  * entry), so common resources are subtracted from the trigger table
@@ -438,8 +449,19 @@ int apei_resources_sub(struct apei_resources *resources1,
 }
 EXPORT_SYMBOL_GPL(apei_resources_sub);
 
+static int apei_get_nvs_callback(__u64 start, __u64 size, void *data)
+{
+	struct apei_resources *resources = data;
+	return apei_res_add(&resources->iomem, start, size);
+}
+
+static int apei_get_nvs_resources(struct apei_resources *resources)
+{
+	return acpi_nvs_for_each_region(apei_get_nvs_callback, resources);
+}
+
 /*
- * IO memory/port rersource management mechanism is used to check
+ * IO memory/port resource management mechanism is used to check
  * whether memory/port area used by GARs conflicts with normal memory
  * or IO memory/port of devices.
  */
@@ -448,21 +470,35 @@ int apei_resources_request(struct apei_resources *resources,
 {
 	struct apei_res *res, *res_bak = NULL;
 	struct resource *r;
+	struct apei_resources nvs_resources;
 	int rc;
 
 	rc = apei_resources_sub(resources, &apei_resources_all);
 	if (rc)
 		return rc;
 
+	/*
+	 * Some firmware uses ACPI NVS region, that has been marked as
+	 * busy, so exclude it from APEI resources to avoid false
+	 * conflict.
+	 */
+	apei_resources_init(&nvs_resources);
+	rc = apei_get_nvs_resources(&nvs_resources);
+	if (rc)
+		goto res_fini;
+	rc = apei_resources_sub(resources, &nvs_resources);
+	if (rc)
+		goto res_fini;
+
 	rc = -EINVAL;
 	list_for_each_entry(res, &resources->iomem, list) {
 		r = request_mem_region(res->start, res->end - res->start,
 				       desc);
 		if (!r) {
 			pr_err(APEI_PFX
-		"Can not request iomem region <%016llx-%016llx> for GARs.\n",
+		"Can not request [mem %#010llx-%#010llx] for %s registers\n",
 			       (unsigned long long)res->start,
-			       (unsigned long long)res->end);
+			       (unsigned long long)res->end - 1, desc);
 			res_bak = res;
 			goto err_unmap_iomem;
 		}
@@ -472,9 +508,9 @@ int apei_resources_request(struct apei_resources *resources,
 		r = request_region(res->start, res->end - res->start, desc);
 		if (!r) {
 			pr_err(APEI_PFX
-		"Can not request ioport region <%016llx-%016llx> for GARs.\n",
+		"Can not request [io  %#06llx-%#06llx] for %s registers\n",
 			       (unsigned long long)res->start,
-			       (unsigned long long)res->end);
+			       (unsigned long long)res->end - 1, desc);
 			res_bak = res;
 			goto err_unmap_ioport;
 		}
@@ -500,6 +536,8 @@ err_unmap_iomem:
 			break;
 		release_mem_region(res->start, res->end - res->start);
 	}
+res_fini:
+	apei_resources_fini(&nvs_resources);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(apei_resources_request);
@@ -553,6 +591,96 @@ static int apei_check_gar(struct acpi_generic_address *reg, u64 *paddr)
 	return 0;
 }
 
+/* read GAR in interrupt (including NMI) or process context */
+int apei_read(u64 *val, struct acpi_generic_address *reg)
+{
+	int rc;
+	u64 address;
+	u32 tmp, width = reg->bit_width;
+	acpi_status status;
+
+	rc = apei_check_gar(reg, &address);
+	if (rc)
+		return rc;
+
+	if (width == 64)
+		width = 32;	/* Break into two 32-bit transfers */
+
+	*val = 0;
+	switch(reg->space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+		status = acpi_os_read_memory((acpi_physical_address)
+					     address, &tmp, width);
+		if (ACPI_FAILURE(status))
+			return -EIO;
+		*val = tmp;
+
+		if (reg->bit_width == 64) {
+			/* Read the top 32 bits */
+			status = acpi_os_read_memory((acpi_physical_address)
+						     (address + 4), &tmp, 32);
+			if (ACPI_FAILURE(status))
+				return -EIO;
+			*val |= ((u64)tmp << 32);
+		}
+		break;
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+		status = acpi_os_read_port(address, (u32 *)val, reg->bit_width);
+		if (ACPI_FAILURE(status))
+			return -EIO;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(apei_read);
+
+/* write GAR in interrupt (including NMI) or process context */
+int apei_write(u64 val, struct acpi_generic_address *reg)
+{
+	int rc;
+	u64 address;
+	u32 width = reg->bit_width;
+	acpi_status status;
+
+	rc = apei_check_gar(reg, &address);
+	if (rc)
+		return rc;
+
+	if (width == 64)
+		width = 32;	/* Break into two 32-bit transfers */
+
+	switch (reg->space_id) {
+	case ACPI_ADR_SPACE_SYSTEM_MEMORY:
+		status = acpi_os_write_memory((acpi_physical_address)
+					      address, ACPI_LODWORD(val),
+					      width);
+		if (ACPI_FAILURE(status))
+			return -EIO;
+
+		if (reg->bit_width == 64) {
+			status = acpi_os_write_memory((acpi_physical_address)
+						      (address + 4),
+						      ACPI_HIDWORD(val), 32);
+			if (ACPI_FAILURE(status))
+				return -EIO;
+		}
+		break;
+	case ACPI_ADR_SPACE_SYSTEM_IO:
+		status = acpi_os_write_port(address, val, reg->bit_width);
+		if (ACPI_FAILURE(status))
+			return -EIO;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(apei_write);
+
 static int collect_res_callback(struct apei_exec_context *ctx,
 				struct acpi_whea_header *entry,
 				void *data)