cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/cell/ras.c

/*
 * Copyright 2006-2008, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


#undef DEBUG

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/reboot.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>

#include <asm/kexec.h>
#include <asm/reg.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/cell-regs.h>

#include "ras.h"



static void dump_fir(int cpu) { struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu); struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu); if (pregs == NULL) return; /* Todo: do some nicer parsing of bits and based on them go down * to other sub-units FIRs and not only IIC */ printk(KERN_ERR "Global Checkstop FIR : 0x%016llx\n", in_be64(&pregs->checkstop_fir)); printk(KERN_ERR "Global Recoverable FIR : 0x%016llx\n", in_be64(&pregs->checkstop_fir)); printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n", in_be64(&pregs->spec_att_mchk_fir)); if (iregs == NULL) return; printk(KERN_ERR "IOC FIR : 0x%016llx\n", in_be64(&iregs->ioc_fir)); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt9896.08%150.00%
Ingo Molnar43.92%150.00%
Total102100.00%2100.00%


void cbe_system_error_exception(struct pt_regs *regs) { int cpu = smp_processor_id(); printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu); dump_fir(cpu); dump_stack(); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt32100.00%1100.00%
Total32100.00%1100.00%


void cbe_maintenance_exception(struct pt_regs *regs) { int cpu = smp_processor_id(); /* * Nothing implemented for the maintenance interrupt at this point */ printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu); dump_stack(); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt28100.00%1100.00%
Total28100.00%1100.00%


void cbe_thermal_exception(struct pt_regs *regs) { int cpu = smp_processor_id(); /* * Nothing implemented for the thermal interrupt at this point */ printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu); dump_stack(); }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt28100.00%1100.00%
Total28100.00%1100.00%


static int cbe_machine_check_handler(struct pt_regs *regs) { int cpu = smp_processor_id(); printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu); dump_fir(cpu); /* No recovery from this code now, lets continue */ return 0; }

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PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt34100.00%1100.00%
Total34100.00%1100.00%

struct ptcal_area { struct list_head list; int nid; int order; struct page *pages; }; static LIST_HEAD(ptcal_list); static int ptcal_start_tok, ptcal_stop_tok;
static int __init cbe_ptcal_enable_on_node(int nid, int order) { struct ptcal_area *area; int ret = -ENOMEM; unsigned long addr; if (is_kdump_kernel()) rtas_call(ptcal_stop_tok, 1, 1, NULL, nid); area = kmalloc(sizeof(*area), GFP_KERNEL); if (!area) goto out_err; area->nid = nid; area->order = order; area->pages = __alloc_pages_node(area->nid, GFP_KERNEL|__GFP_THISNODE, area->order); if (!area->pages) { printk(KERN_WARNING "%s: no page on node %d\n", __func__, area->nid); goto out_free_area; } /* * We move the ptcal area to the middle of the allocated * page, in order to avoid prefetches in memcpy and similar * functions stepping on it. */ addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1); printk(KERN_DEBUG "%s: enabling PTCAL on node %d address=0x%016lx\n", __func__, area->nid, addr); ret = -EIO; if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid, (unsigned int)(addr >> 32), (unsigned int)(addr & 0xffffffff))) { printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n", __func__, nid); goto out_free_pages; } list_add(&area->list, &ptcal_list); return 0; out_free_pages: __free_pages(area->pages, area->order); out_free_area: kfree(area); out_err: return ret; }

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PersonTokensPropCommitsCommitProp
Jeremy Kerr20782.47%114.29%
Gerhard Stenzel3614.34%114.29%
M. Mohan Kumar31.20%114.29%
Milton D. Miller II20.80%114.29%
Vlastimil Babka10.40%114.29%
Johannes Weiner10.40%114.29%
Harvey Harrison10.40%114.29%
Total251100.00%7100.00%


static int __init cbe_ptcal_enable(void) { const u32 *size; struct device_node *np; int order, found_mic = 0; np = of_find_node_by_path("/rtas"); if (!np) return -ENODEV; size = of_get_property(np, "ibm,cbe-ptcal-size", NULL); if (!size) { of_node_put(np); return -ENODEV; } pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size); order = get_order(*size); of_node_put(np); /* support for malta device trees, with be@/mic@ nodes */ for_each_node_by_type(np, "mic-tm") { cbe_ptcal_enable_on_node(of_node_to_nid(np), order); found_mic = 1; } if (found_mic) return 0; /* support for older device tree - use cpu nodes */ for_each_node_by_type(np, "cpu") { const u32 *nid = of_get_property(np, "node-id", NULL); if (!nid) { printk(KERN_ERR "%s: node %pOF is missing node-id?\n", __func__, np); continue; } cbe_ptcal_enable_on_node(*nid, order); found_mic = 1; } return found_mic ? 0 : -ENODEV; }

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PersonTokensPropCommitsCommitProp
Jeremy Kerr17193.44%120.00%
Julia Lawall73.83%120.00%
Stephen Rothwell21.09%120.00%
Harvey Harrison21.09%120.00%
Rob Herring10.55%120.00%
Total183100.00%5100.00%


static int cbe_ptcal_disable(void) { struct ptcal_area *area, *tmp; int ret = 0; pr_debug("%s: disabling PTCAL\n", __func__); list_for_each_entry_safe(area, tmp, &ptcal_list, list) { /* disable ptcal on this node */ if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) { printk(KERN_ERR "%s: error disabling PTCAL " "on node %d!\n", __func__, area->nid); ret = -EIO; continue; } /* ensure we can access the PTCAL area */ memset(page_address(area->pages), 0, 1 << (area->order + PAGE_SHIFT)); /* clean up */ list_del(&area->list); __free_pages(area->pages, area->order); kfree(area); } return ret; }

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PersonTokensPropCommitsCommitProp
Jeremy Kerr12898.46%150.00%
Harvey Harrison21.54%150.00%
Total130100.00%2100.00%


static int cbe_ptcal_notify_reboot(struct notifier_block *nb, unsigned long code, void *data) { return cbe_ptcal_disable(); }

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PersonTokensPropCommitsCommitProp
Jeremy Kerr23100.00%1100.00%
Total23100.00%1100.00%


static void cbe_ptcal_crash_shutdown(void) { cbe_ptcal_disable(); }

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PersonTokensPropCommitsCommitProp
Arnd Bergmann11100.00%1100.00%
Total11100.00%1100.00%

static struct notifier_block cbe_ptcal_reboot_notifier = { .notifier_call = cbe_ptcal_notify_reboot }; #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON static int sysreset_hack;
static int __init cbe_sysreset_init(void) { struct cbe_pmd_regs __iomem *regs; sysreset_hack = of_machine_is_compatible("IBM,CBPLUS-1.0"); if (!sysreset_hack) return 0; regs = cbe_get_cpu_pmd_regs(0); if (!regs) return 0; /* Enable JTAG system-reset hack */ out_be32(&regs->fir_mode_reg, in_be32(&regs->fir_mode_reg) | CBE_PMD_FIR_MODE_M8); return 0; }

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PersonTokensPropCommitsCommitProp
Christian Krafft6698.51%150.00%
Grant C. Likely11.49%150.00%
Total67100.00%2100.00%

device_initcall(cbe_sysreset_init);
int cbe_sysreset_hack(void) { struct cbe_pmd_regs __iomem *regs; /* * The BMC can inject user triggered system reset exceptions, * but cannot set the system reset reason in srr1, * so check an extra register here. */ if (sysreset_hack && (smp_processor_id() == 0)) { regs = cbe_get_cpu_pmd_regs(0); if (!regs) return 0; if (in_be64(&regs->ras_esc_0) & 0x0000ffff) { out_be64(&regs->ras_esc_0, 0); return 0; } } return 1; }

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PersonTokensPropCommitsCommitProp
Christian Krafft72100.00%1100.00%
Total72100.00%1100.00%

#endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
static int __init cbe_ptcal_init(void) { int ret; ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal"); ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal"); if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE) return -ENODEV; ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier); if (ret) goto out1; ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown); if (ret) goto out2; return cbe_ptcal_enable(); out2: unregister_reboot_notifier(&cbe_ptcal_reboot_notifier); out1: printk(KERN_ERR "Can't disable PTCAL, so not enabling\n"); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Kerr6064.52%133.33%
Arnd Bergmann3234.41%133.33%
Daniel Axtens11.08%133.33%
Total93100.00%3100.00%

arch_initcall(cbe_ptcal_init);
void __init cbe_ras_init(void) { unsigned long hid0; /* * Enable System Error & thermal interrupts and wakeup conditions */ hid0 = mfspr(SPRN_HID0); hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP | HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP; mtspr(SPRN_HID0, hid0); mb(); /* * Install machine check handler. Leave setting of precise mode to * what the firmware did for now */ ppc_md.machine_check_exception = cbe_machine_check_handler; mb(); /* * For now, we assume that IOC_FIR is already set to forward some * error conditions to the System Error handler. If that is not true * then it will have to be fixed up here. */ }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt51100.00%1100.00%
Total51100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Jeremy Kerr64352.79%15.00%
Benjamin Herrenschmidt29424.14%210.00%
Christian Krafft15312.56%15.00%
Arnd Bergmann453.69%15.00%
Gerhard Stenzel362.96%15.00%
Milton D. Miller II100.82%15.00%
Julia Lawall70.57%15.00%
M. Mohan Kumar50.41%15.00%
Harvey Harrison50.41%15.00%
Ingo Molnar40.33%15.00%
Michael Ellerman30.25%15.00%
Tejun Heo30.25%15.00%
Alexey Dobriyan30.25%15.00%
Stephen Rothwell20.16%15.00%
Johannes Weiner10.08%15.00%
Grant C. Likely10.08%15.00%
Daniel Axtens10.08%15.00%
Vlastimil Babka10.08%15.00%
Rob Herring10.08%15.00%
Total1218100.00%20100.00%
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