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acpi: Add support for Firmware Performance Data Table

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Add ACPI FPDT support to report firmware boot timing information to
the OS. The FPDT table contains timing data for firmware phases from
reset through OS handoff.

Add some functions to enable generation of this table.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-10-20 10:11:41 +01:00
parent d26f3fe96a
commit 958e2ecf55
3 changed files with 224 additions and 0 deletions
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73
test/dm/acpi.c
View File

@@ -7,6 +7,7 @@
*/
#include <bloblist.h>
#include <bootstage.h>
#include <console.h>
#include <dm.h>
#include <efi_log.h>
@@ -961,3 +962,75 @@ static int dm_test_acpi_bgrt(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_acpi_bgrt, UTF_SCAN_FDT);
/* Test ACPI FPDT (Firmware Performance Data Table) generation */
static int dm_test_acpi_fpdt(struct unit_test_state *uts)
{
struct acpi_fpdt_boot *rec;
struct acpi_fpdt *fpdt;
struct acpi_ctx ctx;
ulong addr, time;
void *buf;
addr = 0;
buf = map_sysmem(addr, BUF_SIZE);
/* Set up context with base tables (RSDP, RSDT, XSDT) */
ut_assertok(setup_ctx_and_base_tables(uts, &ctx, addr));
/* Save where the FPDT will be written */
fpdt = ctx.current;
/* Write the FPDT table with test U-Boot start time */
time = timer_get_boot_us();
ut_assertok(acpi_write_fpdt(&ctx, 1234));
/* Verify the FPDT was written at the saved location */
ut_asserteq_mem("FPDT", fpdt->header.signature, ACPI_NAME_LEN);
ut_asserteq(1, fpdt->header.revision);
ut_asserteq(sizeof(struct acpi_fpdt) + sizeof(struct acpi_fpdt_boot),
fpdt->header.length);
/* Verify the boot performance record */
rec = (struct acpi_fpdt_boot *)(fpdt + 1);
ut_asserteq(FPDT_REC_BOOT, rec->hdr.type);
ut_asserteq(sizeof(struct acpi_fpdt_boot), rec->hdr.length);
ut_asserteq(2, rec->hdr.revision);
ut_asserteq(1234, rec->reset_end);
ut_assert(rec->loader_start != 0);
ut_assert(rec->loader_exec != 0);
ut_assert(rec->ebs_entry != 0);
ut_assert(rec->ebs_exit != 0);
/* Verify checksum is valid */
ut_asserteq(0, table_compute_checksum(fpdt, fpdt->header.length));
/* Get pointer to boot record and verify it matches */
rec = acpi_get_fpdt_boot();
ut_assertnonnull(rec);
ut_asserteq_ptr(rec, (struct acpi_fpdt_boot *)(fpdt + 1));
ut_asserteq(1234, rec->reset_end);
/* Update a timing field */
rec->ebs_entry = 123;
rec->ebs_exit = 456;
/* Checksum should now be invalid */
ut_assert(table_compute_checksum(fpdt, fpdt->header.length) != 0);
/* Fix the checksum */
ut_assertok(acpi_fix_fpdt_checksum());
/* Checksum should now be valid again */
ut_asserteq(0, table_compute_checksum(fpdt, fpdt->header.length));
/* Verify the updated values are still there */
ut_asserteq(123, rec->ebs_entry);
ut_asserteq(456, rec->ebs_exit);
unmap_sysmem(buf);
return 0;
}
DM_TEST(dm_test_acpi_fpdt, 0);