This change implements the support for the ACPI ERST feature[1,2].
The size of the ACPI ERST storage is declared via the QEMU
global parameter acpi-erst.size. The size can range from 64KiB
to to 64MiB. The default is 64KiB.
The location of the ACPI ERST storage backing file is delared
via the QEMU global parameter acpi-erst.filename. The default
is acpi-erst.backing.
[1] "Advanced Configuration and Power Interface Specification",
version 6.2, May 2017.
https://www.uefi.org/sites/default/files/resources/ACPI_6_2.pdf
[2] "Unified Extensible Firmware Interface Specification",
version 2.8, March 2019.
https://uefi.org/sites/default/files/resources/UEFI_Spec_2_8_final.pdf
Signed-off-by: Eric DeVolder <eric.devol...@oracle.com>
---
hw/acpi/erst.c | 952 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 952 insertions(+)
create mode 100644 hw/acpi/erst.c
diff --git a/hw/acpi/erst.c b/hw/acpi/erst.c
new file mode 100644
index 0000000..3a342f9
--- /dev/null
+++ b/hw/acpi/erst.c
@@ -0,0 +1,952 @@
+/*
+ * ACPI Error Record Serialization Table, ERST, Implementation
+ *
+ * Copyright (c) 2020 Oracle and/or its affiliates.
+ *
+ * See ACPI specification,
+ * "ACPI Platform Error Interfaces" : "Error Serialization"
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/sysbus.h"
+#include "qom/object_interfaces.h"
+#include "qemu/error-report.h"
+#include "migration/vmstate.h"
+#include "hw/qdev-properties.h"
+#include "hw/acpi/acpi.h"
+#include "hw/acpi/acpi-defs.h"
+#include "hw/acpi/aml-build.h"
+#include "hw/acpi/bios-linker-loader.h"
+#include "exec/address-spaces.h"
+#include "hw/acpi/erst.h"
+
+#ifdef _ERST_DEBUG
+#define erst_debug(fmt, ...) \
+ do { fprintf(stderr, fmt, ## __VA_ARGS__); fflush(stderr); } while (0)
+#else
+#define erst_debug(fmt, ...) do { } while (0)
+#endif
+
+/* See UEFI spec, Appendix N Common Platform Error Record */
+/* UEFI CPER allows for an OSPM book keeping area in the record */
+#define UEFI_CPER_RECORD_MIN_SIZE 128U
+#define UEFI_CPER_SIZE_OFFSET 20U
+#define UEFI_CPER_RECORD_ID_OFFSET 96U
+#define IS_UEFI_CPER_RECORD(ptr) \
+ (((ptr)[0] == 'C') && \
+ ((ptr)[1] == 'P') && \
+ ((ptr)[2] == 'E') && \
+ ((ptr)[3] == 'R'))
+#define THE_UEFI_CPER_RECORD_ID(ptr) \
+ (*(uint64_t *)(&(ptr)[UEFI_CPER_RECORD_ID_OFFSET]))
+
+#define ERST_INVALID_RECORD_ID (~0UL)
+#define ERST_EXECUTE_OPERATION_MAGIC 0x9CUL
+#define ERST_CSR_ACTION (0UL << 3) /* action (cmd) */
+#define ERST_CSR_VALUE (1UL << 3) /* argument/value (data) */
+
+/*
+ * As ERST_IOMEM_SIZE is used to map the ERST into the guest,
+ * it should/must be an integer multiple of PAGE_SIZE.
+ * NOTE that any change to this value will make any pre-
+ * existing backing files, not of the same ERST_IOMEM_SIZE,
+ * unusable to the guest.
+ */
+#define ERST_IOMEM_SIZE (2UL * 4096)
+
+/*
+ * This implementation is an ACTION (cmd) and VALUE (data)
+ * interface consisting of just two 64-bit registers.
+ */
+#define ERST_REG_LEN (2UL * sizeof(uint64_t))
+
+/*
+ * The space not utilized by the register interface is the
+ * buffer for exchanging ERST record contents.
+ */
+#define ERST_RECORD_SIZE (ERST_IOMEM_SIZE - ERST_REG_LEN)
+
+/*
+ * Mode to be used for backing file
+ */
+#define ERST_BACKING_FILE_MODE 0644 /* S_IRWXU|S_IRWXG */
+
+#define ACPIERST(obj) \
+ OBJECT_CHECK(ERSTDeviceState, (obj), TYPE_ACPI_ERST)
+#define ACPIERST_CLASS(oc) \
+ OBJECT_CLASS_CHECK(ERSTDeviceStateClass, (oc), TYPE_ACPI_ERST)
+#define ACPIERST_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(ERSTDeviceStateClass, (obj), TYPE_ACPI_ERST)
+
+static hwaddr erst_base;
+
+typedef struct {
+ SysBusDevice parent_obj;
+
+ MemoryRegion iomem;
+ uint32_t prop_size;
+ char *prop_filename;
+ hwaddr base;
+
+ uint8_t operation;
+ uint8_t busy_status;
+ uint8_t command_status;
+ uint32_t record_offset;
+ uint32_t record_count;
+ uint64_t reg_action;
+ uint64_t reg_value;
+ uint64_t record_identifier;
+
+ unsigned next_record_index;
+ uint8_t record[ERST_RECORD_SIZE]; /* read/written directly by guest */
+ uint8_t tmp_record[ERST_RECORD_SIZE]; /* intermediate manipulation buffer
*/
+ uint8_t *nvram; /* persistent storage, of length prop_size */
+
+} ERSTDeviceState;
+
+static void update_erst_backing_file(ERSTDeviceState *s,
+ off_t offset, const uint8_t *data, size_t length)
+{
+ int fd;
+
+ /* Bounds check */
+ if ((offset + length) > s->prop_size) {
+ error_report("update: off 0x%lx len 0x%lx > size 0x%lx out of range",
+ (long)offset, (long)length, (long)s->prop_size);
+ return;
+ }
+
+ fd = open(s->prop_filename, O_WRONLY | O_CREAT, ERST_BACKING_FILE_MODE);
+ if (fd > 0) {
+ off_t src;
+ size_t wrc = 0;
+ src = lseek(fd, offset, SEEK_SET);
+ if (offset == src) {
+ wrc = write(fd, data, length);
+ }
+ if ((offset != src) || (length != wrc)) {
+ error_report("ERST write failed: %d %d", (int)wrc, (int)length);
+ }
+ close(fd);
+ } else {
+ error_report("open failed: %s : %d", s->prop_filename, fd);
+ }
+}
+
+static unsigned copy_from_nvram_by_index(ERSTDeviceState *s, unsigned index)
+{
+ /* Read a nvram[] entry into tmp_record */
+ unsigned rc = ACPI_ERST_STATUS_FAILED;
+ off_t offset = (index * ERST_RECORD_SIZE);
+
+ if ((offset + ERST_RECORD_SIZE) <= s->prop_size) {
+ memcpy(s->tmp_record, &s->nvram[offset], ERST_RECORD_SIZE);
+ rc = ACPI_ERST_STATUS_SUCCESS;
+ }
+ return rc;
+}
+
+static unsigned copy_to_nvram_by_index(ERSTDeviceState *s, unsigned index)
+{
+ /* Write entry in tmp_record into nvram[], and backing file */
+ unsigned rc = ACPI_ERST_STATUS_FAILED;
+ off_t offset = (index * ERST_RECORD_SIZE);
+
+ if ((offset + ERST_RECORD_SIZE) <= s->prop_size) {
+ memcpy(&s->nvram[offset], s->tmp_record, ERST_RECORD_SIZE);
+ update_erst_backing_file(s, offset, s->tmp_record, ERST_RECORD_SIZE);
+ rc = ACPI_ERST_STATUS_SUCCESS;
+ }
+ return rc;
+}
+
+static int lookup_erst_record_by_identifier(ERSTDeviceState *s,
+ uint64_t record_identifier, bool *record_found, bool alloc_for_write)
+{
+ int rc = -1;
+ int empty_index = -1;
+ int index = 0;
+ unsigned rrc;
+
+ *record_found = 0;
+
+ do {
+ rrc = copy_from_nvram_by_index(s, (unsigned)index);
+ if (rrc == ACPI_ERST_STATUS_SUCCESS) {
+ uint64_t this_identifier;
+ this_identifier = THE_UEFI_CPER_RECORD_ID(s->tmp_record);
+ if (IS_UEFI_CPER_RECORD(s->tmp_record) &&
+ (this_identifier == record_identifier)) {
+ rc = index;
+ *record_found = 1;
+ break;
+ }
+ if ((this_identifier == ERST_INVALID_RECORD_ID) &&
+ (empty_index < 0)) {
+ empty_index = index; /* first available for write */
+ }
+ }
+ ++index;
+ } while (rrc == ACPI_ERST_STATUS_SUCCESS);
+
+ /* Record not found, allocate for writing */
+ if ((rc < 0) && alloc_for_write) {
+ rc = empty_index;
+ }
+
+ return rc;
+}
+
+static unsigned clear_erst_record(ERSTDeviceState *s)
+{
+ unsigned rc = ACPI_ERST_STATUS_RECORD_NOT_FOUND;
+ bool record_found;
+ int index;
+
+ index = lookup_erst_record_by_identifier(s,
+ s->record_identifier, &record_found, 0);
+ if (record_found) {
+ memset(s->tmp_record, 0xFF, ERST_RECORD_SIZE);
+ rc = copy_to_nvram_by_index(s, (unsigned)index);
+ if (rc == ACPI_ERST_STATUS_SUCCESS) {
+ s->record_count -= 1;
+ }
+ }
+
+ return rc;
+}
+
+static unsigned write_erst_record(ERSTDeviceState *s)
+{
+ unsigned rc = ACPI_ERST_STATUS_FAILED;
+
+ if (s->record_offset < (ERST_RECORD_SIZE - UEFI_CPER_RECORD_MIN_SIZE)) {
+ uint64_t record_identifier;
+ uint8_t *record = &s->record[s->record_offset];
+ bool record_found;
+ int index;
+
+ record_identifier = (s->record_identifier == ERST_INVALID_RECORD_ID)
+ ? THE_UEFI_CPER_RECORD_ID(record) : s->record_identifier;
+
+ index = lookup_erst_record_by_identifier(s,
+ record_identifier, &record_found, 1);
+ if (index < 0) {
+ rc = ACPI_ERST_STATUS_NOT_ENOUGH_SPACE;
+ } else {
+ if (0 != s->record_offset) {
+ memset(&s->tmp_record[ERST_RECORD_SIZE - s->record_offset],
+ 0xFF, s->record_offset);
+ }
+ memcpy(s->tmp_record, record, ERST_RECORD_SIZE - s->record_offset);
+ rc = copy_to_nvram_by_index(s, (unsigned)index);
+ if (rc == ACPI_ERST_STATUS_SUCCESS) {
+ if (!record_found) { /* not overwriting existing record */
+ s->record_count += 1; /* writing new record */
+ }
+ }
+ }
+ }
+
+ return rc;
+}
+
+static unsigned next_erst_record(ERSTDeviceState *s,
+ uint64_t *record_identifier)
+{
+ unsigned rc = ACPI_ERST_STATUS_RECORD_NOT_FOUND;
+ unsigned index;
+ unsigned rrc;
+
+ *record_identifier = ERST_INVALID_RECORD_ID;
+
+ index = s->next_record_index;
+ do {
+ rrc = copy_from_nvram_by_index(s, (unsigned)index);
+ if (rrc == ACPI_ERST_STATUS_SUCCESS) {
+ if (IS_UEFI_CPER_RECORD(s->tmp_record)) {
+ s->next_record_index = index + 1; /* where to start next time
*/
+ *record_identifier = THE_UEFI_CPER_RECORD_ID(s->tmp_record);
+ rc = ACPI_ERST_STATUS_SUCCESS;
+ break;
+ }
+ ++index;
+ } else {
+ if (s->next_record_index == 0) {
+ rc = ACPI_ERST_STATUS_RECORD_STORE_EMPTY;
+ }
+ s->next_record_index = 0; /* at end, reset */
+ }
+ } while (rrc == ACPI_ERST_STATUS_SUCCESS);
+
+ return rc;
+}
+
+static unsigned read_erst_record(ERSTDeviceState *s)
+{
+ unsigned rc = ACPI_ERST_STATUS_RECORD_NOT_FOUND;
+ bool record_found;
+ int index;
+
+ index = lookup_erst_record_by_identifier(s,
+ s->record_identifier, &record_found, 0);
+ if (record_found) {
+ rc = copy_from_nvram_by_index(s, (unsigned)index);
+ if (rc == ACPI_ERST_STATUS_SUCCESS) {
+ if (s->record_offset < ERST_RECORD_SIZE) {
+ memcpy(&s->record[s->record_offset], s->tmp_record,
+ ERST_RECORD_SIZE - s->record_offset);
+ }
+ }
+ }
+
+ return rc;
+}
+
+static unsigned get_erst_record_count(ERSTDeviceState *s)
+{
+ /* Compute record_count */
+ off_t offset;
+
+ s->record_count = 0;
+ offset = 0;
+ do {
+ uint8_t *ptr = &s->nvram[offset];
+ uint64_t record_identifier = THE_UEFI_CPER_RECORD_ID(ptr);
+ if (IS_UEFI_CPER_RECORD(ptr) &&
+ (ERST_INVALID_RECORD_ID != record_identifier)) {
+ s->record_count += 1;
+ }
+ offset += ERST_RECORD_SIZE;
+ } while (offset < (off_t)s->prop_size);
+
+ return s->record_count;
+}
+
+static void load_erst_backing_file(ERSTDeviceState *s)
+{
+ int fd;
+ struct stat statbuf;
+
+ erst_debug("+load_erst_backing_file()\n");
+
+ /* Allocate and initialize nvram[] */
+ s->nvram = g_malloc(s->prop_size);
+ memset(s->nvram, 0xFF, s->prop_size);
+
+ /* Ensure backing file at least same as prop_size */
+ if (stat(s->prop_filename, &statbuf) == 0) {
+ /* ensure prop_size at least matches file size */
+ if (statbuf.st_size < s->prop_size) {
+ /* Ensure records are ERST_INVALID_RECORD_ID */
+ memset(s->nvram, 0xFF, s->prop_size - statbuf.st_size);
+ update_erst_backing_file(s,
+ statbuf.st_size, s->nvram, s->prop_size - statbuf.st_size);
+ }
+ }
+
+ /* Pre-load nvram[] from backing file, if present */
+ fd = open(s->prop_filename, O_RDONLY, ERST_BACKING_FILE_MODE);
+ if (fd > 0) {
+ size_t rrc = read(fd, s->nvram, s->prop_size);
+ (void)rrc;
+ close(fd);
+ /*
+ * If existing file is smaller than prop_size, it will be resized
+ * accordingly upon subsequent record writes. If the file
+ * is larger than prop_size, only prop_size bytes are utilized,
+ * the extra bytes are untouched (though will be lost after
+ * a migration when the backing file is re-written as length
+ * of prop_size bytes).
+ */
+ } else {
+ /* Create empty backing file */
+ update_erst_backing_file(s, 0, s->nvram, s->prop_size);
+ }
+
+ /* Initialize record_count */
+ get_erst_record_count(s);
+
+ erst_debug("-load_erst_backing_file() %d\n", s->record_count);
+}
+
+static uint64_t erst_rd_reg64(hwaddr addr,
+ uint64_t reg, unsigned size)
+{
+ uint64_t rdval;
+ uint64_t mask;
+ unsigned shift;
+
+ if (size == sizeof(uint64_t)) {
+ /* 64b access */
+ mask = 0xFFFFFFFFFFFFFFFFUL;
+ shift = 0;
+ } else {
+ /* 32b access */
+ mask = 0x00000000FFFFFFFFUL;
+ shift = ((addr & 0x4) == 0x4) ? 32 : 0;
+ }
+
+ rdval = reg;
+ rdval >>= shift;
+ rdval &= mask;
+
+ return rdval;
+}
+
+static uint64_t erst_wr_reg64(hwaddr addr,
+ uint64_t reg, uint64_t val, unsigned size)
+{
+ uint64_t wrval;
+ uint64_t mask;
+ unsigned shift;
+
+ if (size == sizeof(uint64_t)) {
+ /* 64b access */
+ mask = 0xFFFFFFFFFFFFFFFFUL;
+ shift = 0;
+ } else {
+ /* 32b access */
+ mask = 0x00000000FFFFFFFFUL;
+ shift = ((addr & 0x4) == 0x4) ? 32 : 0;
+ }
+
+ val &= mask;
+ val <<= shift;
+ mask <<= shift;
+ wrval = reg;
+ wrval &= ~mask;
+ wrval |= val;
+
+ return wrval;
+}
+
+static void erst_write(void *opaque, hwaddr addr,
+ uint64_t val, unsigned size)
+{
+ ERSTDeviceState *s = (ERSTDeviceState *)opaque;
+
+ if (addr < ERST_REG_LEN) {
+ /*
+ * NOTE: All actions/operations/side effects happen on the WRITE,
+ * by design. The READs simply return the reg_value contents.
+ */
+ erst_debug("ERST write %016lx %10s val %016lx sz %u",
+ addr, erst_reg(addr), val, size);
+ /* The REGISTER region */
+ switch (addr) {
+ case ERST_CSR_VALUE + 0:
+ case ERST_CSR_VALUE + 4:
+ s->reg_value = erst_wr_reg64(addr, s->reg_value, val, size);
+ break;
+ case ERST_CSR_ACTION + 0:
+/* case ERST_CSR_ACTION+4: as coded, not really a 64b register */
+ switch (val) {
+ case ACPI_ERST_ACTION_BEGIN_WRITE_OPERATION:
+ case ACPI_ERST_ACTION_BEGIN_READ_OPERATION:
+ case ACPI_ERST_ACTION_BEGIN_CLEAR_OPERATION:
+ case ACPI_ERST_ACTION_BEGIN_DUMMY_WRITE_OPERATION:
+ case ACPI_ERST_ACTION_END_OPERATION:
+ s->operation = val;
+ break;
+ case ACPI_ERST_ACTION_SET_RECORD_OFFSET:
+ s->record_offset = s->reg_value;
+ break;
+ case ACPI_ERST_ACTION_EXECUTE_OPERATION:
+ if ((uint8_t)s->reg_value == ERST_EXECUTE_OPERATION_MAGIC) {
+ s->busy_status = 1;
+ switch (s->operation) {
+ case ACPI_ERST_ACTION_BEGIN_WRITE_OPERATION:
+ s->command_status = write_erst_record(s);
+ break;
+ case ACPI_ERST_ACTION_BEGIN_READ_OPERATION:
+ s->command_status = read_erst_record(s);
+ break;
+ case ACPI_ERST_ACTION_BEGIN_CLEAR_OPERATION:
+ s->command_status = clear_erst_record(s);
+ break;
+ case ACPI_ERST_ACTION_BEGIN_DUMMY_WRITE_OPERATION:
+ s->command_status = ACPI_ERST_STATUS_SUCCESS;
+ break;
+ case ACPI_ERST_ACTION_END_OPERATION:
+ s->command_status = ACPI_ERST_STATUS_SUCCESS;
+ break;
+ default:
+ s->command_status = ACPI_ERST_STATUS_FAILED;
+ break;
+ }
+ s->record_identifier = ERST_INVALID_RECORD_ID;
+ s->busy_status = 0;
+ }
+ break;
+ case ACPI_ERST_ACTION_CHECK_BUSY_STATUS:
+ s->reg_value = s->busy_status;
+ break;
+ case ACPI_ERST_ACTION_GET_COMMAND_STATUS:
+ s->reg_value = s->command_status;
+ break;
+ case ACPI_ERST_ACTION_GET_RECORD_IDENTIFIER:
+ s->command_status = next_erst_record(s, &s->reg_value);
+ break;
+ case ACPI_ERST_ACTION_SET_RECORD_IDENTIFIER:
+ s->record_identifier = s->reg_value;
+ break;
+ case ACPI_ERST_ACTION_GET_RECORD_COUNT:
+ s->reg_value = s->record_count;
+ break;
+ case ACPI_ERST_ACTION_GET_ERROR_LOG_ADDRESS_RANGE:
+ s->reg_value = s->base + ERST_REG_LEN;
+ break;
+ case ACPI_ERST_ACTION_GET_ERROR_LOG_ADDRESS_LENGTH:
+ s->reg_value = ERST_RECORD_SIZE;
+ break;
+ case ACPI_ERST_ACTION_GET_ERROR_LOG_ADDRESS_RANGE_ATTRIBUTES:
+ s->reg_value = 0; /* correct/intended value */
+ break;
+ case ACPI_ERST_ACTION_GET_EXECUTE_OPERATION_TIMINGS:
+ /*
+ * 100UL is max, 10UL is nominal
+ */
+ s->reg_value = ((100UL << 32) | (10UL << 0));
+ break;
+ case ACPI_ERST_ACTION_RESERVED:
+ default:
+ /*
+ * NOP
+ */
+ break;
+ }
+ break;
+ default:
+ /*
+ * All other register writes are NO-OPs
+ */
+ break;
+ }
+ } else {
+ /* The RECORD region */
+ unsigned offset = addr - ERST_REG_LEN;
+ uint8_t *ptr = &s->record[offset];
+ switch (size) {
+ default:
+ case sizeof(uint8_t):
+ *(uint8_t *)ptr = (uint8_t)val;
+ break;
+ case sizeof(uint16_t):
+ *(uint16_t *)ptr = (uint16_t)val;
+ break;
+ case sizeof(uint32_t):
+ *(uint32_t *)ptr = (uint32_t)val;
+ break;
+ case sizeof(uint64_t):
+ *(uint64_t *)ptr = (uint64_t)val;
+ break;
+ }
+ }
+}
+
+static uint64_t erst_read(void *opaque, hwaddr addr,
+ unsigned size)
+{
+ ERSTDeviceState *s = (ERSTDeviceState *)opaque;
+ uint64_t val = 0;
+
+ if (addr < ERST_REG_LEN) {
+ switch (addr) {
+ case ERST_CSR_ACTION + 0:
+ case ERST_CSR_ACTION + 4:
+ val = erst_rd_reg64(addr, s->reg_action, size);
+ break;
+ case ERST_CSR_VALUE + 0:
+ case ERST_CSR_VALUE + 4:
+ val = erst_rd_reg64(addr, s->reg_value, size);
+ break;
+ default:
+ break;
+ }
+ erst_debug("ERST read %016lx %10s val %016lx sz %u\n",
+ addr, erst_reg(addr), val, size);
+ } else {
+ /*
+ * The RECORD region
+ */
+ uint8_t *ptr = &s->record[addr - ERST_REG_LEN];
+ switch (size) {
+ default:
+ case sizeof(uint8_t):
+ val = *(uint8_t *)ptr;
+ break;
+ case sizeof(uint16_t):
+ val = *(uint16_t *)ptr;
+ break;
+ case sizeof(uint32_t):
+ val = *(uint32_t *)ptr;
+ break;
+ case sizeof(uint64_t):
+ val = *(uint64_t *)ptr;
+ break;
+ }
+ }
+ erst_debug("ERST read %016lx %10s val %016lx sz %u\n",
+ addr, erst_reg(addr), val, size);
+ return val;
+}
+
+static size_t build_erst_action(GArray *table_data,
+ uint8_t serialization_action,
+ uint8_t instruction,
+ uint8_t flags,
+ uint8_t width,
+ uint64_t address,
+ uint64_t value,
+ uint64_t mask)
+{
+ /* See ACPI spec, Error Serialization */
+ uint8_t access_width = 0;
+ build_append_int_noprefix(table_data, serialization_action, 1);
+ build_append_int_noprefix(table_data, instruction , 1);
+ build_append_int_noprefix(table_data, flags , 1);
+ build_append_int_noprefix(table_data, 0 , 1);
+ /* GAS space_id */
+ build_append_int_noprefix(table_data, AML_SYSTEM_MEMORY , 1);
+ /* GAS bit_width */
+ build_append_int_noprefix(table_data, width , 1);
+ /* GAS bit_offset */
+ build_append_int_noprefix(table_data, 0 , 1);
+ /* GAS access_width */
+ switch (width) {
+ case 8:
+ access_width = 1;
+ break;
+ case 16:
+ access_width = 2;
+ break;
+ case 32:
+ access_width = 3;
+ break;
+ case 64:
+ access_width = 4;
+ break;
+ default:
+ access_width = 0;
+ break;
+ }
+ build_append_int_noprefix(table_data, access_width , 1);
+ /* GAS address */
+ build_append_int_noprefix(table_data, address, 8);
+ /* value */
+ build_append_int_noprefix(table_data, value , 8);
+ /* mask */
+ build_append_int_noprefix(table_data, mask , 8);
+
+ return 1;
+}
+
+static const MemoryRegionOps erst_rw_ops = {
+ .read = erst_read,
+ .write = erst_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+void build_erst(GArray *table_data, BIOSLinker *linker, hwaddr base)
+{
+ unsigned action, insns = 0;
+ unsigned erst_start = table_data->len;
+ unsigned iec_offset = 0;
+
+ /* See ACPI spec, Error Serialization */
+ acpi_data_push(table_data, sizeof(AcpiTableHeader));
+ /* serialization_header_length */
+ build_append_int_noprefix(table_data, 48, 4);
+ /* reserved */
+ build_append_int_noprefix(table_data, 0, 4);
+ iec_offset = table_data->len;
+ /* instruction_entry_count (placeholder) */
+ build_append_int_noprefix(table_data, 0, 4);
+
+#define BEA(I, F, W, ADDR, VAL, MASK) \
+ build_erst_action(table_data, action, \
+ ACPI_ERST_INST_##I, F, W, base + ADDR, VAL, MASK)
+#define MASK8 0x00000000000000FFUL
+#define MASK16 0x000000000000FFFFUL
+#define MASK32 0x00000000FFFFFFFFUL
+#define MASK64 0xFFFFFFFFFFFFFFFFUL
+
+ for (action = 0; action < ACPI_ERST_MAX_ACTIONS; ++action) {
+ switch (action) {
+ case ACPI_ERST_ACTION_BEGIN_WRITE_OPERATION:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_BEGIN_READ_OPERATION:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_BEGIN_CLEAR_OPERATION:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_END_OPERATION:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_SET_RECORD_OFFSET:
+ insns += BEA(WRITE_REGISTER , 0, 32,
+ ERST_CSR_VALUE , 0, MASK32);
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_EXECUTE_OPERATION:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_VALUE , ERST_EXECUTE_OPERATION_MAGIC, MASK8);
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_CHECK_BUSY_STATUS:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER_VALUE , 0, 32,
+ ERST_CSR_VALUE, 0x01, MASK8);
+ break;
+ case ACPI_ERST_ACTION_GET_COMMAND_STATUS:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 32,
+ ERST_CSR_VALUE, 0, MASK8);
+ break;
+ case ACPI_ERST_ACTION_GET_RECORD_IDENTIFIER:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 64,
+ ERST_CSR_VALUE, 0, MASK64);
+ break;
+ case ACPI_ERST_ACTION_SET_RECORD_IDENTIFIER:
+ insns += BEA(WRITE_REGISTER , 0, 64,
+ ERST_CSR_VALUE , 0, MASK64);
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_GET_RECORD_COUNT:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 32,
+ ERST_CSR_VALUE, 0, MASK32);
+ break;
+ case ACPI_ERST_ACTION_BEGIN_DUMMY_WRITE_OPERATION:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_RESERVED:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ break;
+ case ACPI_ERST_ACTION_GET_ERROR_LOG_ADDRESS_RANGE:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 64,
+ ERST_CSR_VALUE, 0, MASK64);
+ break;
+ case ACPI_ERST_ACTION_GET_ERROR_LOG_ADDRESS_LENGTH:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 64,
+ ERST_CSR_VALUE, 0, MASK32);
+ break;
+ case ACPI_ERST_ACTION_GET_ERROR_LOG_ADDRESS_RANGE_ATTRIBUTES:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 32,
+ ERST_CSR_VALUE, 0, MASK32);
+ break;
+ case ACPI_ERST_ACTION_GET_EXECUTE_OPERATION_TIMINGS:
+ insns += BEA(WRITE_REGISTER_VALUE, 0, 32,
+ ERST_CSR_ACTION, action, MASK8);
+ insns += BEA(READ_REGISTER , 0, 64,
+ ERST_CSR_VALUE, 0, MASK64);
+ default:
+ insns += BEA(NOOP, 0, 0, 0, action, 0);
+ break;
+ }
+ }
+
+ /* acpi_data_push() within BEA() can result in new GArray pointer */
+ *(uint32_t *)(table_data->data + iec_offset) = cpu_to_le32(insns);
+
+ build_header(linker, table_data,
+ (void *)(table_data->data + erst_start),
+ "ERST", table_data->len - erst_start,
+ 1, NULL, NULL);
+
+ if (erst_base == 0) {
+ /*
+ * This ACPI routine is invoked twice, but this code
+ * snippet needs to happen just once.
+ * And this code in erst_class_init() is too early.
+ */
+ DeviceState *dev;
+ SysBusDevice *s;
+
+ dev = qdev_new(TYPE_ACPI_ERST);
+ erst_debug("qdev_create dev %p\n", dev);
+ s = SYS_BUS_DEVICE(dev);
+ sysbus_realize_and_unref(s, &error_fatal);
+
+ ACPIERST(dev)->base = base;
+ sysbus_mmio_map(s, 0, base);
+ erst_base = base;
+ erst_debug("erst_base %lx\n", base);
+ }
+}
+
+/*******************************************************************/
+/*******************************************************************/
+static int erst_post_load(void *opaque, int version_id)
+{
+ ERSTDeviceState *s = opaque;
+ erst_debug("+erst_post_load(%d)\n", version_id);
+ /* Ensure nvram[] persists into backing file */
+ update_erst_backing_file(s, 0, s->nvram, s->prop_size);
+ erst_debug("-erst_post_load()\n");
+ return 0;
+}
+
+static const VMStateDescription erst_vmstate = {
+ .name = "acpi-erst",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .post_load = erst_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(operation, ERSTDeviceState),
+ VMSTATE_UINT8(busy_status, ERSTDeviceState),
+ VMSTATE_UINT8(command_status, ERSTDeviceState),
+ VMSTATE_UINT32(record_offset, ERSTDeviceState),
+ VMSTATE_UINT32(record_count, ERSTDeviceState),
+ VMSTATE_UINT64(reg_action, ERSTDeviceState),
+ VMSTATE_UINT64(reg_value, ERSTDeviceState),
+ VMSTATE_UINT64(record_identifier, ERSTDeviceState),
+ VMSTATE_UINT8_ARRAY(record, ERSTDeviceState, ERST_RECORD_SIZE),
+ VMSTATE_UINT8_ARRAY(tmp_record, ERSTDeviceState, ERST_RECORD_SIZE),
+ VMSTATE_VARRAY_UINT32(nvram, ERSTDeviceState, prop_size, 0,
+ vmstate_info_uint8, uint8_t),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void erst_realizefn(DeviceState *dev, Error **errp)
+{
+ SysBusDevice *d = SYS_BUS_DEVICE(dev);
+ ERSTDeviceState *s = ACPIERST(dev);
+
+ erst_debug("+erst_realizefn()\n");
+ if (!s->prop_filename) {
+ s->prop_filename = (char *)(TYPE_ACPI_ERST ".backing");
+ }
+
+ if (!s->prop_filename) {
+ error_setg(errp, "'filename' property is not set");
+ return;
+ }
+
+ if (!(s->prop_size > ERST_RECORD_SIZE) &&
+ (s->prop_size <= 0x04000000)) {
+ error_setg(errp, "'size' property %d is not set properly",
+ s->prop_size);
+ return;
+ }
+
+ /* Convert prop_size to integer multiple of ERST_RECORD_SIZE */
+ s->prop_size -= (s->prop_size % ERST_RECORD_SIZE);
+
+ load_erst_backing_file(s);
+
+ erst_debug("filename %s\n", s->prop_filename);
+ erst_debug("size %x\n", s->prop_size);
+
+ memory_region_init_io(&s->iomem, OBJECT(s), &erst_rw_ops, s,
+ TYPE_ACPI_ERST, ERST_IOMEM_SIZE);
+ sysbus_init_mmio(d, &s->iomem);
+ erst_debug("-erst_realizefn()\n");
+}
+
+static void erst_unrealizefn(DeviceState *dev)
+{
+ ERSTDeviceState *s = ACPIERST(dev);
+
+ erst_debug("+erst_unrealizefn()\n");
+ if (s->nvram) {
+ /* Ensure nvram[] persists into backing file */
+ update_erst_backing_file(s, 0, s->nvram, s->prop_size);
+ g_free(s->nvram);
+ s->nvram = NULL;
+ }
+ erst_debug("-erst_unrealizefn()\n");
+}
+
+static void erst_reset(DeviceState *dev)
+{
+ ERSTDeviceState *s = ACPIERST(dev);
+
+ erst_debug("+erst_reset(%p) %d\n", s, s->record_count);
+ s->operation = 0;
+ s->busy_status = 0;
+ s->command_status = ACPI_ERST_STATUS_SUCCESS;
+ /* indicate empty/no-more until further notice */
+ s->record_identifier = ERST_INVALID_RECORD_ID;
+ s->record_offset = 0;
+ s->next_record_index = 0;
+ /* NOTE: record_count and nvram[] are initialized elsewhere */
+ erst_debug("-erst_reset()\n");
+}
+
+static Property erst_properties[] = {
+ DEFINE_PROP_UINT32("size", ERSTDeviceState, prop_size, 0x00010000),
+ DEFINE_PROP_STRING("filename", ERSTDeviceState, prop_filename),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void erst_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ erst_debug("+erst_class_init()\n");
+ dc->realize = erst_realizefn;
+ dc->unrealize = erst_unrealizefn;
+ dc->reset = erst_reset;
+ dc->vmsd = &erst_vmstate;
+ device_class_set_props(dc, erst_properties);
+ dc->desc = "ACPI Error Record Serialization Table (ERST) device";
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ erst_debug("-erst_class_init()\n");
+}
+
+static const TypeInfo erst_type_info = {
+ .name = TYPE_ACPI_ERST,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .class_init = erst_class_init,
+ .instance_size = sizeof(ERSTDeviceState),
+};
+
+static void erst_register_types(void)
+{
+ type_register_static(&erst_type_info);
+}
+
+type_init(erst_register_types)
--
1.8.3.1
