ACPI: Refactor use of global and device NVS

After ChromeOS NVS was moved to a separate allocation and the use
of multiple OperationRegions, maintaining the fixed offsets is not
necessary.

Use actual structure size for OperationRegions, but align the
allocations to 8 bytes or sizeof(uint64_t).

Change-Id: I9c73b7c44d234af42c571b23187b924ca2c3894a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51639
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/acpi/Kconfig

@@ -30,9 +30,6 @@ config ACPI_SOC_NVS
 	  Set to indicate <soc/nvs.h> exists for the platform with a definition
 	  for global_nvs.
 
-config ACPI_HAS_DEVICE_NVS
-	bool
-
 config ACPI_NO_PCAT_8259
 	bool
 	help

src/acpi/acpigen_extern.asl

@@ -9,9 +9,6 @@
 
 #if CONFIG(ACPI_SOC_NVS)
 External (GNVS, OpRegionObj)
-#endif
-
-#if CONFIG(ACPI_HAS_DEVICE_NVS)
 External (DNVS, OpRegionObj)
 #endif
 

src/acpi/gnvs.c

@@ -8,32 +8,28 @@
 #include <stdint.h>
 #include <string.h>
 #include <types.h>
-#include <vendorcode/google/chromeos/gnvs.h>
 
 static struct global_nvs *gnvs;
+static void *dnvs;
 
 void acpi_create_gnvs(void)
 {
-	size_t gnvs_size;
+	const size_t gnvs_size = ALIGN_UP(sizeof(struct global_nvs), sizeof(uint64_t));
+	const size_t dnvs_size = ALIGN_UP(size_of_dnvs(), sizeof(uint64_t));
 
 	gnvs = cbmem_find(CBMEM_ID_ACPI_GNVS);
 	if (gnvs)
 		return;
 
-	/* Match with OpRegion declared in global_nvs.asl. */
-	gnvs_size = sizeof(struct global_nvs);
-	if (gnvs_size < 0x100)
-		gnvs_size = 0x100;
-	if (CONFIG(ACPI_HAS_DEVICE_NVS))
-		gnvs_size = 0x2000;
-	else if (CONFIG(CHROMEOS_NVS))
-		gnvs_size = 0x1000;
-
-	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, gnvs_size);
+	/* Allocate for both GNVS and DNVS OpRegions. */
+	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, gnvs_size + dnvs_size);
 	if (!gnvs)
 		return;
 
-	memset(gnvs, 0, gnvs_size);
+	memset(gnvs, 0, gnvs_size + dnvs_size);
+
+	if (dnvs_size)
+		dnvs = (char *)gnvs + gnvs_size;
 
 	if (CONFIG(CONSOLE_CBMEM))
 		gnvs->cbmc = (uintptr_t)cbmem_find(CBMEM_ID_CONSOLE);
@@ -54,19 +50,21 @@ void *acpi_get_gnvs(void)
 
 void *acpi_get_device_nvs(void)
 {
-	return (u8 *)gnvs + GNVS_DEVICE_NVS_OFFSET;
+	return dnvs;
 }
 
 /* Implemented under platform. */
 __weak void soc_fill_gnvs(struct global_nvs *gnvs_) { }
 __weak void mainboard_fill_gnvs(struct global_nvs *gnvs_) { }
+__weak size_t size_of_dnvs(void) { return 0; }
 
 /* Called from write_acpi_tables() only on normal boot path. */
 void acpi_fill_gnvs(void)
 {
-	const struct opregion gnvs_op = OPREGION("GNVS", SYSTEMMEMORY, (uintptr_t)gnvs, 0x100);
-	const struct opregion dnvs_op = OPREGION("DNVS", SYSTEMMEMORY,
-					(uintptr_t)gnvs + GNVS_DEVICE_NVS_OFFSET, 0x1000);
+	const struct opregion gnvs_op = OPREGION("GNVS", SYSTEMMEMORY, (uintptr_t)gnvs,
+						 sizeof(struct global_nvs));
+	const struct opregion dnvs_op = OPREGION("DNVS", SYSTEMMEMORY, (uintptr_t)dnvs,
+						 size_of_dnvs());
 
 	if (!gnvs)
 		return;
@@ -76,10 +74,8 @@ void acpi_fill_gnvs(void)
 
 	acpigen_write_scope("\\");
 	acpigen_write_opregion(&gnvs_op);
-
-	if (CONFIG(ACPI_HAS_DEVICE_NVS))
+	if (dnvs)
 		acpigen_write_opregion(&dnvs_op);
-
 	acpigen_pop_len();
 }
 

src/include/acpi/acpi_gnvs.h

@@ -8,6 +8,8 @@
 struct global_nvs;
 
 void acpi_create_gnvs(void);
+size_t size_of_dnvs(void);
+
 #if CONFIG(ACPI_SOC_NVS)
 void *acpi_get_gnvs(void);
 void *acpi_get_device_nvs(void);

src/soc/intel/baytrail/Kconfig

@@ -8,7 +8,6 @@ if SOC_INTEL_BAYTRAIL
 config CPU_SPECIFIC_OPTIONS
 	def_bool y
 	select ACPI_INTEL_HARDWARE_SLEEP_VALUES
-	select ACPI_HAS_DEVICE_NVS
 	select ARCH_ALL_STAGES_X86_32
 	select BOOT_DEVICE_SPI_FLASH_NO_EARLY_WRITES
 	select BOOT_DEVICE_SUPPORTS_WRITES

src/soc/intel/baytrail/ramstage.c

@@ -13,6 +13,7 @@
 #include <device/pci_def.h>
 #include <device/pci_ops.h>
 
+#include <soc/device_nvs.h>
 #include <soc/gpio.h>
 #include <soc/lpc.h>
 #include <soc/msr.h>
@@ -116,6 +117,11 @@ static void fill_in_pattrs(void)
 	attrs->bclk_khz = bus_freq_khz();
 }
 
+size_t size_of_dnvs(void)
+{
+	return sizeof(struct device_nvs);
+}
+
 /* Save bit index for first enabled event in PM1_STS for \_SB._SWS */
 static void pm_fill_gnvs(struct global_nvs *gnvs, const struct chipset_power_state *ps)
 {

src/soc/intel/baytrail/smihandler.c

@@ -20,8 +20,6 @@
 #include <soc/nvs.h>
 #include <soc/device_nvs.h>
 
-#include <vendorcode/google/chromeos/gnvs.h>
-
 int southbridge_io_trap_handler(int smif)
 {
 	switch (smif) {
@@ -210,7 +208,7 @@ static void southbridge_smi_gsmi(void)
 
 void *acpi_get_device_nvs(void)
 {
-	return (u8 *)gnvs + GNVS_DEVICE_NVS_OFFSET;
+	return (u8 *)gnvs + ALIGN_UP(sizeof(struct global_nvs), sizeof(uint64_t));
 }
 
 /*

src/soc/intel/braswell/Kconfig

@@ -8,7 +8,6 @@ if SOC_INTEL_BRASWELL
 config CPU_SPECIFIC_OPTIONS
 	def_bool y
 	select ACPI_INTEL_HARDWARE_SLEEP_VALUES
-	select ACPI_HAS_DEVICE_NVS
 	select ARCH_ALL_STAGES_X86_32
 	select BOOT_DEVICE_SPI_FLASH_NO_EARLY_WRITES
 	select BOOT_DEVICE_SUPPORTS_WRITES

src/soc/intel/braswell/acpi.c

@@ -13,6 +13,7 @@
 #include <device/pci.h>
 #include <drivers/intel/gma/opregion.h>
 #include <soc/acpi.h>
+#include <soc/device_nvs.h>
 #include <soc/gfx.h>
 #include <soc/iomap.h>
 #include <soc/irq.h>
@@ -60,6 +61,11 @@ static acpi_cstate_t cstate_map[] = {
 	}
 };
 
+size_t size_of_dnvs(void)
+{
+	return sizeof(struct device_nvs);
+}
+
 void soc_fill_gnvs(struct global_nvs *gnvs)
 {
 	/* Fill in the Wi-Fi Region ID */

src/vendorcode/google/chromeos/gnvs.h

@@ -8,8 +8,6 @@
 #define ACTIVE_ECFW_RO		0
 #define ACTIVE_ECFW_RW		1
 
-#define GNVS_DEVICE_NVS_OFFSET 0x1000
-
 struct chromeos_acpi {
 	/* ChromeOS specific */
 	u32	vbt0;		// 00 boot reason