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bc294838cc
Almost all PA-RISC machines have either a button that is labeled with 'TOC' or a BMC function to trigger a TOC. TOC is a non-maskable interrupt that is sent to the processor. This can be used for diagnostic purposes like obtaining a stack trace/register dump or to enter KDB/KGDB. As an example, on my c8000, TOC can be used with: CONFIG_KGDB=y CONFIG_KGDB_KDB=y and the 'kgdboc=ttyS0,115200' appended to the command line. Press ^[( on serial console, which will enter the BMC command line, and enter 'TOC s': root@(none):/# ( cli>TOC s Sending TOC/INIT. <Cpu3> 2800035d03e00000 0000000040c21ac8 CC_ERR_CHECK_TOC <Cpu0> 2800035d00e00000 0000000040c21ad0 CC_ERR_CHECK_TOC <Cpu2> 2800035d02e00000 0000000040c21ac8 CC_ERR_CHECK_TOC <Cpu1> 2800035d01e00000 0000000040c21ad0 CC_ERR_CHECK_TOC <Cpu3> 37000f7303e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu0> 37000f7300e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu2> 37000f7302e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu1> 37000f7301e00000 2000000000000000 CC_ERR_CPU_CHECK_SUMMARY <Cpu3> 4300100803e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu0> 4300100800e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu2> 4300100802e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC <Cpu1> 4300100801e00000 c0000000001d26cc CC_MC_BR_TO_OS_TOC Entering kdb (current=0x00000000411cef80, pid 0) on processor 0 due to NonMaskable Interrupt @ 0x40c21ad0 [0]kdb> Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/kgdb.h>
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#include <linux/printk.h>
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#include <linux/sched/debug.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <asm/pdc.h>
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#include <asm/pdc_chassis.h>
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unsigned int __aligned(16) toc_lock = 1;
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static void toc20_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_20 *toc)
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{
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int i;
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regs->gr[0] = (unsigned long)toc->cr[22];
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for (i = 1; i < 32; i++)
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regs->gr[i] = (unsigned long)toc->gr[i];
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for (i = 0; i < 8; i++)
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regs->sr[i] = (unsigned long)toc->sr[i];
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regs->iasq[0] = (unsigned long)toc->cr[17];
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regs->iasq[1] = (unsigned long)toc->iasq_back;
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regs->iaoq[0] = (unsigned long)toc->cr[18];
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regs->iaoq[1] = (unsigned long)toc->iaoq_back;
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regs->sar = (unsigned long)toc->cr[11];
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regs->iir = (unsigned long)toc->cr[19];
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regs->isr = (unsigned long)toc->cr[20];
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regs->ior = (unsigned long)toc->cr[21];
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}
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static void toc11_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_11 *toc)
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{
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int i;
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regs->gr[0] = toc->cr[22];
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for (i = 1; i < 32; i++)
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regs->gr[i] = toc->gr[i];
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for (i = 0; i < 8; i++)
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regs->sr[i] = toc->sr[i];
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regs->iasq[0] = toc->cr[17];
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regs->iasq[1] = toc->iasq_back;
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regs->iaoq[0] = toc->cr[18];
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regs->iaoq[1] = toc->iaoq_back;
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regs->sar = toc->cr[11];
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regs->iir = toc->cr[19];
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regs->isr = toc->cr[20];
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regs->ior = toc->cr[21];
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}
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void notrace __noreturn __cold toc_intr(struct pt_regs *regs)
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{
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struct pdc_toc_pim_20 pim_data20;
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struct pdc_toc_pim_11 pim_data11;
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nmi_enter();
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if (boot_cpu_data.cpu_type >= pcxu) {
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if (pdc_pim_toc20(&pim_data20))
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panic("Failed to get PIM data");
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toc20_to_pt_regs(regs, &pim_data20);
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} else {
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if (pdc_pim_toc11(&pim_data11))
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panic("Failed to get PIM data");
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toc11_to_pt_regs(regs, &pim_data11);
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}
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#ifdef CONFIG_KGDB
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if (atomic_read(&kgdb_active) != -1)
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kgdb_nmicallback(raw_smp_processor_id(), regs);
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kgdb_handle_exception(9, SIGTRAP, 0, regs);
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#endif
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show_regs(regs);
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/* give other CPUs time to show their backtrace */
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mdelay(2000);
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machine_restart("TOC");
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/* should never reach this */
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panic("TOC");
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}
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static __init int setup_toc(void)
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{
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unsigned int csum = 0;
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unsigned long toc_code = (unsigned long)dereference_function_descriptor(toc_handler);
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int i;
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PAGE0->vec_toc = __pa(toc_code) & 0xffffffff;
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#ifdef CONFIG_64BIT
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PAGE0->vec_toc_hi = __pa(toc_code) >> 32;
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#endif
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PAGE0->vec_toclen = toc_handler_size;
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for (i = 0; i < toc_handler_size/4; i++)
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csum += ((u32 *)toc_code)[i];
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toc_handler_csum = -csum;
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pr_info("TOC handler registered\n");
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return 0;
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}
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early_initcall(setup_toc);
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