[PATCH RFC 1/5] acpi/ghes: add a firmware file with HEST address

[Mauro Carvalho Chehab]

Store HEST table address at GPA, placing its content at
hest_addr_le variable.

Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>

---

Change from v8:
- hest_addr_lr is now pointing to the error source size and data.

Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
---
 hw/acpi/ghes.c         | 15 +++++++++++++++
 include/hw/acpi/ghes.h |  1 +
 2 files changed, 16 insertions(+)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index 8b3292be07e7..2c2cf444edeb 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -30,6 +30,7 @@
 
 #define ACPI_HW_ERROR_FW_CFG_FILE           "etc/hardware_errors"
 #define ACPI_HW_ERROR_ADDR_FW_CFG_FILE      "etc/hardware_errors_addr"
+#define ACPI_HEST_ADDR_FW_CFG_FILE          "etc/acpi_table_hest_addr"
 
 /* The max size in bytes for one error block */
 #define ACPI_GHES_MAX_RAW_DATA_LENGTH   (1 * KiB)
@@ -361,6 +362,8 @@ void acpi_build_hest(GArray *table_data, GArray 
*hardware_errors,
 
     acpi_table_begin(&table, table_data);
 
+    int hest_offset = table_data->len;
+
     /* Error Source Count */
     build_append_int_noprefix(table_data, num_sources, 4);
     for (i = 0; i < num_sources; i++) {
@@ -368,6 +371,15 @@ void acpi_build_hest(GArray *table_data, GArray 
*hardware_errors,
     }
 
     acpi_table_end(linker, &table);
+
+    /*
+     * tell firmware to write into GPA the address of HEST via fw_cfg,
+     * once initialized.
+     */
+    bios_linker_loader_write_pointer(linker,
+                                     ACPI_HEST_ADDR_FW_CFG_FILE, 0,
+                                     sizeof(uint64_t),
+                                     ACPI_BUILD_TABLE_FILE, hest_offset);
 }
 
 void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
@@ -381,6 +393,9 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
     fw_cfg_add_file_callback(s, ACPI_HW_ERROR_ADDR_FW_CFG_FILE, NULL, NULL,
         NULL, &(ags->hw_error_le), sizeof(ags->hw_error_le), false);
 
+    fw_cfg_add_file_callback(s, ACPI_HEST_ADDR_FW_CFG_FILE, NULL, NULL,
+        NULL, &(ags->hest_addr_le), sizeof(ags->hest_addr_le), false);
+
     ags->present = true;
 }
 
diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index e47ffacbb5c9..a07c30ef13b7 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -58,6 +58,7 @@ enum AcpiGhesNotifyType {
 };
 
 typedef struct AcpiGhesState {
+    uint64_t hest_addr_le;
     uint64_t hw_error_le;
     bool present; /* True if GHES is present at all on this board */
 } AcpiGhesState;
-- 
2.46.1