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47 lines
1.3 KiB
47 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* kmsg dumper that ensures the OPAL console fully flushes panic messages |
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* |
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* Author: Russell Currey <[email protected]> |
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* |
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* Copyright 2015 IBM Corporation. |
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*/ |
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#include <linux/kmsg_dump.h> |
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#include <asm/opal.h> |
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#include <asm/opal-api.h> |
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/* |
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* Console output is controlled by OPAL firmware. The kernel regularly calls |
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* OPAL_POLL_EVENTS, which flushes some console output. In a panic state, |
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* however, the kernel no longer calls OPAL_POLL_EVENTS and the panic message |
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* may not be completely printed. This function does not actually dump the |
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* message, it just ensures that OPAL completely flushes the console buffer. |
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*/ |
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static void kmsg_dump_opal_console_flush(struct kmsg_dumper *dumper, |
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enum kmsg_dump_reason reason) |
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{ |
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/* |
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* Outside of a panic context the pollers will continue to run, |
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* so we don't need to do any special flushing. |
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*/ |
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if (reason != KMSG_DUMP_PANIC) |
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return; |
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opal_flush_console(0); |
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} |
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static struct kmsg_dumper opal_kmsg_dumper = { |
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.dump = kmsg_dump_opal_console_flush |
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}; |
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void __init opal_kmsg_init(void) |
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{ |
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int rc; |
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/* Add our dumper to the list */ |
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rc = kmsg_dump_register(&opal_kmsg_dumper); |
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if (rc != 0) |
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pr_err("opal: kmsg_dump_register failed; returned %d\n", rc); |
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}
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