diff options
| author | Hari Bathini <hbathini@linux.ibm.com> | 2024-05-09 17:27:55 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-05-10 16:36:10 +1000 |
| commit | 3416c9daa6b13c0e2a656d4e2dee8de95f9a38cf (patch) | |
| tree | 6ef7f345b07214008a14e47efdb712b8784c1a66 /arch/powerpc/kernel/fadump.c | |
| parent | 683eab94da75bcf55a9c65e0c31d0529edebe86d (diff) | |
powerpc/fadump: pass additional parameters when fadump is active
Append the additional parameters passed/set in the dedicated parameter
area (RTAS_FADUMP_PARAM_AREA) to bootargs in fadump capture kernel.
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240509115755.519982-4-hbathini@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel/fadump.c')
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 6d35b09d6f3a..2276bacc4170 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -131,6 +131,41 @@ static int __init fadump_cma_init(void) static int __init fadump_cma_init(void) { return 1; } #endif /* CONFIG_CMA */ +/* + * Additional parameters meant for capture kernel are placed in a dedicated area. + * If this is capture kernel boot, append these parameters to bootargs. + */ +void __init fadump_append_bootargs(void) +{ + char *append_args; + size_t len; + + if (!fw_dump.dump_active || !fw_dump.param_area_supported || !fw_dump.param_area) + return; + + if (fw_dump.param_area >= fw_dump.boot_mem_top) { + if (memblock_reserve(fw_dump.param_area, COMMAND_LINE_SIZE)) { + pr_warn("WARNING: Can't use additional parameters area!\n"); + fw_dump.param_area = 0; + return; + } + } + + append_args = (char *)fw_dump.param_area; + len = strlen(boot_command_line); + + /* + * Too late to fail even if cmdline size exceeds. Truncate additional parameters + * to cmdline size and proceed anyway. + */ + if (len + strlen(append_args) >= COMMAND_LINE_SIZE - 1) + pr_warn("WARNING: Appending parameters exceeds cmdline size. Truncating!\n"); + + pr_debug("Cmdline: %s\n", boot_command_line); + snprintf(boot_command_line + len, COMMAND_LINE_SIZE - len, " %s", append_args); + pr_info("Updated cmdline: %s\n", boot_command_line); +} + /* Scan the Firmware Assisted dump configuration details. */ int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname, int depth, void *data) |