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affddff69c
On BMC machines, console output is controlled by the OPAL firmware and is only flushed when its pollers are called. When the kernel is in a panic state, it no longer calls these pollers and thus console output does not completely flush, causing some output from the panic to be lost. Output is only actually lost when the kernel is configured to not power off or reboot after panic (i.e. CONFIG_PANIC_TIMEOUT is set to 0) since OPAL flushes the console buffer as part of its power down routines. Before this patch, however, only partial output would be printed during the timeout wait. This patch adds a new kmsg_dumper which gets called at panic time to ensure panic output is not lost. It accomplishes this by calling OPAL_CONSOLE_FLUSH in the OPAL API, and if that is not available, the pollers are called enough times to (hopefully) completely flush the buffer. The flushing mechanism will only affect output printed at and before the kmsg_dump call in kernel/panic.c:panic(). As such, the "end Kernel panic" message may still be truncated as follows: >Call Trace: >[c000000f1f603b00] [c0000000008e9458] dump_stack+0x90/0xbc (unreliable) >[c000000f1f603b30] [c0000000008e7e78] panic+0xf8/0x2c4 >[c000000f1f603bc0] [c000000000be4860] mount_block_root+0x288/0x33c >[c000000f1f603c80] [c000000000be4d14] prepare_namespace+0x1f4/0x254 >[c000000f1f603d00] [c000000000be43e8] kernel_init_freeable+0x318/0x350 >[c000000f1f603dc0] [c00000000000bd74] kernel_init+0x24/0x130 >[c000000f1f603e30] [c0000000000095b0] ret_from_kernel_thread+0x5c/0xac >---[ end Kernel panic - not This functionality is implemented as a kmsg_dumper as it seems to be the most sensible way to introduce platform-specific functionality to the panic function. Signed-off-by: Russell Currey <ruscur@russell.cc> Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
305 lines
9.7 KiB
ArmAsm
305 lines
9.7 KiB
ArmAsm
/*
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* PowerNV OPAL API wrappers
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*
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* Copyright 2011 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/jump_label.h>
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#include <asm/ppc_asm.h>
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#include <asm/hvcall.h>
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#include <asm/asm-offsets.h>
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#include <asm/opal.h>
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.section ".text"
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#ifdef CONFIG_TRACEPOINTS
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#ifdef HAVE_JUMP_LABEL
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#define OPAL_BRANCH(LABEL) \
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ARCH_STATIC_BRANCH(LABEL, opal_tracepoint_key)
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#else
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.section ".toc","aw"
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.globl opal_tracepoint_refcount
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opal_tracepoint_refcount:
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.llong 0
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.section ".text"
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/*
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* We branch around this in early init by using an unconditional cpu
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* feature.
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*/
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#define OPAL_BRANCH(LABEL) \
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BEGIN_FTR_SECTION; \
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b 1f; \
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END_FTR_SECTION(0, 1); \
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ld r12,opal_tracepoint_refcount@toc(r2); \
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cmpdi r12,0; \
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bne- LABEL; \
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1:
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#endif
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#else
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#define OPAL_BRANCH(LABEL)
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#endif
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/* TODO:
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*
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* - Trace irqs in/off (needs saving/restoring all args, argh...)
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* - Get r11 feed up by Dave so I can have better register usage
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*/
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#define OPAL_CALL(name, token) \
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_GLOBAL_TOC(name); \
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mflr r0; \
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std r0,16(r1); \
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li r0,token; \
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OPAL_BRANCH(opal_tracepoint_entry) \
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mfcr r12; \
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stw r12,8(r1); \
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std r1,PACAR1(r13); \
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li r11,0; \
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mfmsr r12; \
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ori r11,r11,MSR_EE; \
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std r12,PACASAVEDMSR(r13); \
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andc r12,r12,r11; \
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mtmsrd r12,1; \
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LOAD_REG_ADDR(r11,opal_return); \
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mtlr r11; \
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li r11,MSR_DR|MSR_IR|MSR_LE;\
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andc r12,r12,r11; \
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mtspr SPRN_HSRR1,r12; \
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LOAD_REG_ADDR(r11,opal); \
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ld r12,8(r11); \
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ld r2,0(r11); \
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mtspr SPRN_HSRR0,r12; \
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hrfid
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opal_return:
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/*
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* Fixup endian on OPAL return... we should be able to simplify
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* this by instead converting the below trampoline to a set of
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* bytes (always BE) since MSR:LE will end up fixed up as a side
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* effect of the rfid.
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*/
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FIXUP_ENDIAN
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ld r2,PACATOC(r13);
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lwz r4,8(r1);
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ld r5,16(r1);
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ld r6,PACASAVEDMSR(r13);
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mtspr SPRN_SRR0,r5;
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mtspr SPRN_SRR1,r6;
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mtcr r4;
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rfid
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#ifdef CONFIG_TRACEPOINTS
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opal_tracepoint_entry:
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stdu r1,-STACKFRAMESIZE(r1)
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std r0,STK_REG(R23)(r1)
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std r3,STK_REG(R24)(r1)
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std r4,STK_REG(R25)(r1)
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std r5,STK_REG(R26)(r1)
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std r6,STK_REG(R27)(r1)
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std r7,STK_REG(R28)(r1)
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std r8,STK_REG(R29)(r1)
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std r9,STK_REG(R30)(r1)
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std r10,STK_REG(R31)(r1)
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mr r3,r0
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addi r4,r1,STK_REG(R24)
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bl __trace_opal_entry
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ld r0,STK_REG(R23)(r1)
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ld r3,STK_REG(R24)(r1)
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ld r4,STK_REG(R25)(r1)
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ld r5,STK_REG(R26)(r1)
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ld r6,STK_REG(R27)(r1)
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ld r7,STK_REG(R28)(r1)
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ld r8,STK_REG(R29)(r1)
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ld r9,STK_REG(R30)(r1)
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ld r10,STK_REG(R31)(r1)
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LOAD_REG_ADDR(r11,opal_tracepoint_return)
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mfcr r12
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std r11,16(r1)
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stw r12,8(r1)
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std r1,PACAR1(r13)
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li r11,0
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mfmsr r12
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ori r11,r11,MSR_EE
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std r12,PACASAVEDMSR(r13)
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andc r12,r12,r11
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mtmsrd r12,1
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LOAD_REG_ADDR(r11,opal_return)
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mtlr r11
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li r11,MSR_DR|MSR_IR|MSR_LE
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andc r12,r12,r11
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mtspr SPRN_HSRR1,r12
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LOAD_REG_ADDR(r11,opal)
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ld r12,8(r11)
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ld r2,0(r11)
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mtspr SPRN_HSRR0,r12
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hrfid
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opal_tracepoint_return:
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std r3,STK_REG(R31)(r1)
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mr r4,r3
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ld r0,STK_REG(R23)(r1)
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bl __trace_opal_exit
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ld r3,STK_REG(R31)(r1)
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addi r1,r1,STACKFRAMESIZE
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ld r0,16(r1)
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mtlr r0
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blr
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#endif
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/*
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* Make opal call in realmode. This is a generic function to be called
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* from realmode. It handles endianness.
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*
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* r13 - paca pointer
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* r1 - stack pointer
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* r0 - opal token
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*/
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_GLOBAL(opal_call_realmode)
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mflr r12
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std r12,PPC_LR_STKOFF(r1)
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ld r2,PACATOC(r13)
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/* Set opal return address */
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LOAD_REG_ADDR(r12,return_from_opal_call)
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mtlr r12
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mfmsr r12
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#ifdef __LITTLE_ENDIAN__
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/* Handle endian-ness */
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li r11,MSR_LE
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andc r12,r12,r11
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#endif
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mtspr SPRN_HSRR1,r12
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LOAD_REG_ADDR(r11,opal)
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ld r12,8(r11)
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ld r2,0(r11)
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mtspr SPRN_HSRR0,r12
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hrfid
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return_from_opal_call:
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#ifdef __LITTLE_ENDIAN__
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FIXUP_ENDIAN
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#endif
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ld r12,PPC_LR_STKOFF(r1)
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mtlr r12
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blr
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OPAL_CALL(opal_invalid_call, OPAL_INVALID_CALL);
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OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
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OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
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OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE);
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OPAL_CALL(opal_rtc_read, OPAL_RTC_READ);
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OPAL_CALL(opal_rtc_write, OPAL_RTC_WRITE);
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OPAL_CALL(opal_cec_power_down, OPAL_CEC_POWER_DOWN);
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OPAL_CALL(opal_cec_reboot, OPAL_CEC_REBOOT);
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OPAL_CALL(opal_cec_reboot2, OPAL_CEC_REBOOT2);
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OPAL_CALL(opal_read_nvram, OPAL_READ_NVRAM);
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OPAL_CALL(opal_write_nvram, OPAL_WRITE_NVRAM);
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OPAL_CALL(opal_handle_interrupt, OPAL_HANDLE_INTERRUPT);
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OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS);
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OPAL_CALL(opal_pci_set_hub_tce_memory, OPAL_PCI_SET_HUB_TCE_MEMORY);
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OPAL_CALL(opal_pci_set_phb_tce_memory, OPAL_PCI_SET_PHB_TCE_MEMORY);
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OPAL_CALL(opal_pci_config_read_byte, OPAL_PCI_CONFIG_READ_BYTE);
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OPAL_CALL(opal_pci_config_read_half_word, OPAL_PCI_CONFIG_READ_HALF_WORD);
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OPAL_CALL(opal_pci_config_read_word, OPAL_PCI_CONFIG_READ_WORD);
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OPAL_CALL(opal_pci_config_write_byte, OPAL_PCI_CONFIG_WRITE_BYTE);
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OPAL_CALL(opal_pci_config_write_half_word, OPAL_PCI_CONFIG_WRITE_HALF_WORD);
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OPAL_CALL(opal_pci_config_write_word, OPAL_PCI_CONFIG_WRITE_WORD);
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OPAL_CALL(opal_set_xive, OPAL_SET_XIVE);
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OPAL_CALL(opal_get_xive, OPAL_GET_XIVE);
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OPAL_CALL(opal_register_exception_handler, OPAL_REGISTER_OPAL_EXCEPTION_HANDLER);
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OPAL_CALL(opal_pci_eeh_freeze_status, OPAL_PCI_EEH_FREEZE_STATUS);
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OPAL_CALL(opal_pci_eeh_freeze_clear, OPAL_PCI_EEH_FREEZE_CLEAR);
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OPAL_CALL(opal_pci_eeh_freeze_set, OPAL_PCI_EEH_FREEZE_SET);
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OPAL_CALL(opal_pci_err_inject, OPAL_PCI_ERR_INJECT);
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OPAL_CALL(opal_pci_shpc, OPAL_PCI_SHPC);
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OPAL_CALL(opal_pci_phb_mmio_enable, OPAL_PCI_PHB_MMIO_ENABLE);
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OPAL_CALL(opal_pci_set_phb_mem_window, OPAL_PCI_SET_PHB_MEM_WINDOW);
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OPAL_CALL(opal_pci_map_pe_mmio_window, OPAL_PCI_MAP_PE_MMIO_WINDOW);
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OPAL_CALL(opal_pci_set_phb_table_memory, OPAL_PCI_SET_PHB_TABLE_MEMORY);
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OPAL_CALL(opal_pci_set_pe, OPAL_PCI_SET_PE);
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OPAL_CALL(opal_pci_set_peltv, OPAL_PCI_SET_PELTV);
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OPAL_CALL(opal_pci_set_mve, OPAL_PCI_SET_MVE);
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OPAL_CALL(opal_pci_set_mve_enable, OPAL_PCI_SET_MVE_ENABLE);
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OPAL_CALL(opal_pci_get_xive_reissue, OPAL_PCI_GET_XIVE_REISSUE);
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OPAL_CALL(opal_pci_set_xive_reissue, OPAL_PCI_SET_XIVE_REISSUE);
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OPAL_CALL(opal_pci_set_xive_pe, OPAL_PCI_SET_XIVE_PE);
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OPAL_CALL(opal_get_xive_source, OPAL_GET_XIVE_SOURCE);
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OPAL_CALL(opal_get_msi_32, OPAL_GET_MSI_32);
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OPAL_CALL(opal_get_msi_64, OPAL_GET_MSI_64);
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OPAL_CALL(opal_start_cpu, OPAL_START_CPU);
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OPAL_CALL(opal_query_cpu_status, OPAL_QUERY_CPU_STATUS);
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OPAL_CALL(opal_write_oppanel, OPAL_WRITE_OPPANEL);
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OPAL_CALL(opal_pci_map_pe_dma_window, OPAL_PCI_MAP_PE_DMA_WINDOW);
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OPAL_CALL(opal_pci_map_pe_dma_window_real, OPAL_PCI_MAP_PE_DMA_WINDOW_REAL);
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OPAL_CALL(opal_pci_reset, OPAL_PCI_RESET);
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OPAL_CALL(opal_pci_get_hub_diag_data, OPAL_PCI_GET_HUB_DIAG_DATA);
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OPAL_CALL(opal_pci_get_phb_diag_data, OPAL_PCI_GET_PHB_DIAG_DATA);
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OPAL_CALL(opal_pci_fence_phb, OPAL_PCI_FENCE_PHB);
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OPAL_CALL(opal_pci_reinit, OPAL_PCI_REINIT);
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OPAL_CALL(opal_pci_mask_pe_error, OPAL_PCI_MASK_PE_ERROR);
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OPAL_CALL(opal_set_slot_led_status, OPAL_SET_SLOT_LED_STATUS);
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OPAL_CALL(opal_get_epow_status, OPAL_GET_EPOW_STATUS);
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OPAL_CALL(opal_get_dpo_status, OPAL_GET_DPO_STATUS);
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OPAL_CALL(opal_set_system_attention_led, OPAL_SET_SYSTEM_ATTENTION_LED);
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OPAL_CALL(opal_pci_next_error, OPAL_PCI_NEXT_ERROR);
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OPAL_CALL(opal_pci_poll, OPAL_PCI_POLL);
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OPAL_CALL(opal_pci_msi_eoi, OPAL_PCI_MSI_EOI);
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OPAL_CALL(opal_pci_get_phb_diag_data2, OPAL_PCI_GET_PHB_DIAG_DATA2);
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OPAL_CALL(opal_xscom_read, OPAL_XSCOM_READ);
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OPAL_CALL(opal_xscom_write, OPAL_XSCOM_WRITE);
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OPAL_CALL(opal_lpc_read, OPAL_LPC_READ);
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OPAL_CALL(opal_lpc_write, OPAL_LPC_WRITE);
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OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU);
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OPAL_CALL(opal_reinit_cpus, OPAL_REINIT_CPUS);
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OPAL_CALL(opal_read_elog, OPAL_ELOG_READ);
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OPAL_CALL(opal_send_ack_elog, OPAL_ELOG_ACK);
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OPAL_CALL(opal_get_elog_size, OPAL_ELOG_SIZE);
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OPAL_CALL(opal_resend_pending_logs, OPAL_ELOG_RESEND);
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OPAL_CALL(opal_write_elog, OPAL_ELOG_WRITE);
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OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE);
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OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE);
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OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE);
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OPAL_CALL(opal_resync_timebase, OPAL_RESYNC_TIMEBASE);
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OPAL_CALL(opal_check_token, OPAL_CHECK_TOKEN);
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OPAL_CALL(opal_dump_init, OPAL_DUMP_INIT);
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OPAL_CALL(opal_dump_info, OPAL_DUMP_INFO);
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OPAL_CALL(opal_dump_info2, OPAL_DUMP_INFO2);
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OPAL_CALL(opal_dump_read, OPAL_DUMP_READ);
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OPAL_CALL(opal_dump_ack, OPAL_DUMP_ACK);
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OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
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OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
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OPAL_CALL(opal_dump_resend_notification, OPAL_DUMP_RESEND);
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OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);
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OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
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OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
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OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
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OPAL_CALL(opal_handle_hmi, OPAL_HANDLE_HMI);
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OPAL_CALL(opal_config_cpu_idle_state, OPAL_CONFIG_CPU_IDLE_STATE);
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OPAL_CALL(opal_slw_set_reg, OPAL_SLW_SET_REG);
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OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION);
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OPAL_CALL(opal_unregister_dump_region, OPAL_UNREGISTER_DUMP_REGION);
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OPAL_CALL(opal_pci_set_phb_cxl_mode, OPAL_PCI_SET_PHB_CAPI_MODE);
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OPAL_CALL(opal_tpo_write, OPAL_WRITE_TPO);
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OPAL_CALL(opal_tpo_read, OPAL_READ_TPO);
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OPAL_CALL(opal_ipmi_send, OPAL_IPMI_SEND);
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OPAL_CALL(opal_ipmi_recv, OPAL_IPMI_RECV);
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OPAL_CALL(opal_i2c_request, OPAL_I2C_REQUEST);
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OPAL_CALL(opal_flash_read, OPAL_FLASH_READ);
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OPAL_CALL(opal_flash_write, OPAL_FLASH_WRITE);
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OPAL_CALL(opal_flash_erase, OPAL_FLASH_ERASE);
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OPAL_CALL(opal_prd_msg, OPAL_PRD_MSG);
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OPAL_CALL(opal_leds_get_ind, OPAL_LEDS_GET_INDICATOR);
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OPAL_CALL(opal_leds_set_ind, OPAL_LEDS_SET_INDICATOR);
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OPAL_CALL(opal_console_flush, OPAL_CONSOLE_FLUSH);
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