508 lines
14 KiB
C
508 lines
14 KiB
C
/*
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* Hypervisor-assisted dump
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*
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* Linas Vepstas, Manish Ahuja 2008
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* Copyright 2008 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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*/
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/mm.h>
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#include <linux/of.h>
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#include <linux/pfn.h>
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#include <linux/swap.h>
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#include <linux/sysfs.h>
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#include <asm/page.h>
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#include <asm/phyp_dump.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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/* Variables, used to communicate data between early boot and late boot */
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static struct phyp_dump phyp_dump_vars;
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struct phyp_dump *phyp_dump_info = &phyp_dump_vars;
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static int ibm_configure_kernel_dump;
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/* ------------------------------------------------- */
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/* RTAS interfaces to declare the dump regions */
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struct dump_section {
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u32 dump_flags;
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u16 source_type;
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u16 error_flags;
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u64 source_address;
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u64 source_length;
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u64 length_copied;
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u64 destination_address;
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};
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struct phyp_dump_header {
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u32 version;
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u16 num_of_sections;
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u16 status;
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u32 first_offset_section;
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u32 dump_disk_section;
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u64 block_num_dd;
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u64 num_of_blocks_dd;
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u32 offset_dd;
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u32 maxtime_to_auto;
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/* No dump disk path string used */
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struct dump_section cpu_data;
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struct dump_section hpte_data;
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struct dump_section kernel_data;
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};
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/* The dump header *must be* in low memory, so .bss it */
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static struct phyp_dump_header phdr;
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#define NUM_DUMP_SECTIONS 3
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#define DUMP_HEADER_VERSION 0x1
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#define DUMP_REQUEST_FLAG 0x1
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#define DUMP_SOURCE_CPU 0x0001
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#define DUMP_SOURCE_HPTE 0x0002
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#define DUMP_SOURCE_RMO 0x0011
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#define DUMP_ERROR_FLAG 0x2000
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#define DUMP_TRIGGERED 0x4000
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#define DUMP_PERFORMED 0x8000
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/**
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* init_dump_header() - initialize the header declaring a dump
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* Returns: length of dump save area.
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*
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* When the hypervisor saves crashed state, it needs to put
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* it somewhere. The dump header tells the hypervisor where
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* the data can be saved.
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*/
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static unsigned long init_dump_header(struct phyp_dump_header *ph)
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{
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unsigned long addr_offset = 0;
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/* Set up the dump header */
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ph->version = DUMP_HEADER_VERSION;
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ph->num_of_sections = NUM_DUMP_SECTIONS;
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ph->status = 0;
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ph->first_offset_section =
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(u32)offsetof(struct phyp_dump_header, cpu_data);
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ph->dump_disk_section = 0;
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ph->block_num_dd = 0;
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ph->num_of_blocks_dd = 0;
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ph->offset_dd = 0;
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ph->maxtime_to_auto = 0; /* disabled */
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/* The first two sections are mandatory */
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ph->cpu_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->cpu_data.source_type = DUMP_SOURCE_CPU;
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ph->cpu_data.source_address = 0;
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ph->cpu_data.source_length = phyp_dump_info->cpu_state_size;
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ph->cpu_data.destination_address = addr_offset;
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addr_offset += phyp_dump_info->cpu_state_size;
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ph->hpte_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->hpte_data.source_type = DUMP_SOURCE_HPTE;
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ph->hpte_data.source_address = 0;
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ph->hpte_data.source_length = phyp_dump_info->hpte_region_size;
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ph->hpte_data.destination_address = addr_offset;
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addr_offset += phyp_dump_info->hpte_region_size;
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/* This section describes the low kernel region */
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ph->kernel_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->kernel_data.source_type = DUMP_SOURCE_RMO;
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ph->kernel_data.source_address = PHYP_DUMP_RMR_START;
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ph->kernel_data.source_length = PHYP_DUMP_RMR_END;
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ph->kernel_data.destination_address = addr_offset;
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addr_offset += ph->kernel_data.source_length;
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return addr_offset;
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}
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static void print_dump_header(const struct phyp_dump_header *ph)
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{
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#ifdef DEBUG
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printk(KERN_INFO "dump header:\n");
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/* setup some ph->sections required */
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printk(KERN_INFO "version = %d\n", ph->version);
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printk(KERN_INFO "Sections = %d\n", ph->num_of_sections);
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printk(KERN_INFO "Status = 0x%x\n", ph->status);
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/* No ph->disk, so all should be set to 0 */
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printk(KERN_INFO "Offset to first section 0x%x\n",
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ph->first_offset_section);
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printk(KERN_INFO "dump disk sections should be zero\n");
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printk(KERN_INFO "dump disk section = %d\n", ph->dump_disk_section);
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printk(KERN_INFO "block num = %ld\n", ph->block_num_dd);
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printk(KERN_INFO "number of blocks = %ld\n", ph->num_of_blocks_dd);
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printk(KERN_INFO "dump disk offset = %d\n", ph->offset_dd);
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printk(KERN_INFO "Max auto time= %d\n", ph->maxtime_to_auto);
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/*set cpu state and hpte states as well scratch pad area */
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printk(KERN_INFO " CPU AREA \n");
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printk(KERN_INFO "cpu dump_flags =%d\n", ph->cpu_data.dump_flags);
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printk(KERN_INFO "cpu source_type =%d\n", ph->cpu_data.source_type);
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printk(KERN_INFO "cpu error_flags =%d\n", ph->cpu_data.error_flags);
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printk(KERN_INFO "cpu source_address =%lx\n",
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ph->cpu_data.source_address);
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printk(KERN_INFO "cpu source_length =%lx\n",
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ph->cpu_data.source_length);
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printk(KERN_INFO "cpu length_copied =%lx\n",
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ph->cpu_data.length_copied);
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printk(KERN_INFO " HPTE AREA \n");
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printk(KERN_INFO "HPTE dump_flags =%d\n", ph->hpte_data.dump_flags);
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printk(KERN_INFO "HPTE source_type =%d\n", ph->hpte_data.source_type);
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printk(KERN_INFO "HPTE error_flags =%d\n", ph->hpte_data.error_flags);
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printk(KERN_INFO "HPTE source_address =%lx\n",
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ph->hpte_data.source_address);
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printk(KERN_INFO "HPTE source_length =%lx\n",
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ph->hpte_data.source_length);
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printk(KERN_INFO "HPTE length_copied =%lx\n",
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ph->hpte_data.length_copied);
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printk(KERN_INFO " SRSD AREA \n");
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printk(KERN_INFO "SRSD dump_flags =%d\n", ph->kernel_data.dump_flags);
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printk(KERN_INFO "SRSD source_type =%d\n", ph->kernel_data.source_type);
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printk(KERN_INFO "SRSD error_flags =%d\n", ph->kernel_data.error_flags);
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printk(KERN_INFO "SRSD source_address =%lx\n",
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ph->kernel_data.source_address);
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printk(KERN_INFO "SRSD source_length =%lx\n",
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ph->kernel_data.source_length);
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printk(KERN_INFO "SRSD length_copied =%lx\n",
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ph->kernel_data.length_copied);
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#endif
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}
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static ssize_t show_phyp_dump_active(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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/* create filesystem entry so kdump is phyp-dump aware */
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return sprintf(buf, "%lx\n", phyp_dump_info->phyp_dump_at_boot);
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}
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static struct kobj_attribute pdl = __ATTR(phyp_dump_active, 0600,
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show_phyp_dump_active,
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NULL);
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static void register_dump_area(struct phyp_dump_header *ph, unsigned long addr)
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{
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int rc;
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/* Add addr value if not initialized before */
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if (ph->cpu_data.destination_address == 0) {
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ph->cpu_data.destination_address += addr;
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ph->hpte_data.destination_address += addr;
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ph->kernel_data.destination_address += addr;
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}
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/* ToDo Invalidate kdump and free memory range. */
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do {
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rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL,
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1, ph, sizeof(struct phyp_dump_header));
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} while (rtas_busy_delay(rc));
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if (rc) {
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printk(KERN_ERR "phyp-dump: unexpected error (%d) on "
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"register\n", rc);
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print_dump_header(ph);
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return;
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}
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rc = sysfs_create_file(kernel_kobj, &pdl.attr);
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if (rc)
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printk(KERN_ERR "phyp-dump: unable to create sysfs"
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" file (%d)\n", rc);
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}
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static
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void invalidate_last_dump(struct phyp_dump_header *ph, unsigned long addr)
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{
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int rc;
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/* Add addr value if not initialized before */
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if (ph->cpu_data.destination_address == 0) {
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ph->cpu_data.destination_address += addr;
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ph->hpte_data.destination_address += addr;
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ph->kernel_data.destination_address += addr;
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}
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do {
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rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL,
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2, ph, sizeof(struct phyp_dump_header));
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} while (rtas_busy_delay(rc));
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if (rc) {
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printk(KERN_ERR "phyp-dump: unexpected error (%d) "
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"on invalidate\n", rc);
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print_dump_header(ph);
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}
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}
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/* ------------------------------------------------- */
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/**
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* release_memory_range -- release memory previously lmb_reserved
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* @start_pfn: starting physical frame number
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* @nr_pages: number of pages to free.
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*
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* This routine will release memory that had been previously
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* lmb_reserved in early boot. The released memory becomes
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* available for genreal use.
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*/
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static void release_memory_range(unsigned long start_pfn,
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unsigned long nr_pages)
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{
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struct page *rpage;
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unsigned long end_pfn;
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long i;
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end_pfn = start_pfn + nr_pages;
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for (i = start_pfn; i <= end_pfn; i++) {
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rpage = pfn_to_page(i);
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if (PageReserved(rpage)) {
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ClearPageReserved(rpage);
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init_page_count(rpage);
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__free_page(rpage);
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totalram_pages++;
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}
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}
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}
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/**
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* track_freed_range -- Counts the range being freed.
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* Once the counter goes to zero, it re-registers dump for
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* future use.
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*/
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static void
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track_freed_range(unsigned long addr, unsigned long length)
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{
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static unsigned long scratch_area_size, reserved_area_size;
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if (addr < phyp_dump_info->init_reserve_start)
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return;
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if ((addr >= phyp_dump_info->init_reserve_start) &&
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(addr <= phyp_dump_info->init_reserve_start +
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phyp_dump_info->init_reserve_size))
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reserved_area_size += length;
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if ((addr >= phyp_dump_info->reserved_scratch_addr) &&
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(addr <= phyp_dump_info->reserved_scratch_addr +
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phyp_dump_info->reserved_scratch_size))
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scratch_area_size += length;
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if ((reserved_area_size == phyp_dump_info->init_reserve_size) &&
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(scratch_area_size == phyp_dump_info->reserved_scratch_size)) {
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invalidate_last_dump(&phdr,
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phyp_dump_info->reserved_scratch_addr);
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register_dump_area(&phdr,
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phyp_dump_info->reserved_scratch_addr);
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}
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}
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/* ------------------------------------------------- */
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/**
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* sysfs_release_region -- sysfs interface to release memory range.
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*
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* Usage:
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* "echo <start addr> <length> > /sys/kernel/release_region"
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*
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* Example:
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* "echo 0x40000000 0x10000000 > /sys/kernel/release_region"
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*
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* will release 256MB starting at 1GB.
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*/
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static ssize_t store_release_region(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned long start_addr, length, end_addr;
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unsigned long start_pfn, nr_pages;
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ssize_t ret;
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ret = sscanf(buf, "%lx %lx", &start_addr, &length);
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if (ret != 2)
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return -EINVAL;
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track_freed_range(start_addr, length);
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/* Range-check - don't free any reserved memory that
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* wasn't reserved for phyp-dump */
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if (start_addr < phyp_dump_info->init_reserve_start)
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start_addr = phyp_dump_info->init_reserve_start;
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end_addr = phyp_dump_info->init_reserve_start +
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phyp_dump_info->init_reserve_size;
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if (start_addr+length > end_addr)
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length = end_addr - start_addr;
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/* Release the region of memory assed in by user */
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start_pfn = PFN_DOWN(start_addr);
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nr_pages = PFN_DOWN(length);
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release_memory_range(start_pfn, nr_pages);
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return count;
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}
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static ssize_t show_release_region(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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u64 second_addr_range;
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/* total reserved size - start of scratch area */
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second_addr_range = phyp_dump_info->init_reserve_size -
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phyp_dump_info->reserved_scratch_size;
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return sprintf(buf, "CPU:0x%lx-0x%lx: HPTE:0x%lx-0x%lx:"
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" DUMP:0x%lx-0x%lx, 0x%lx-0x%lx:\n",
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phdr.cpu_data.destination_address,
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phdr.cpu_data.length_copied,
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phdr.hpte_data.destination_address,
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phdr.hpte_data.length_copied,
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phdr.kernel_data.destination_address,
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phdr.kernel_data.length_copied,
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phyp_dump_info->init_reserve_start,
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second_addr_range);
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}
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static struct kobj_attribute rr = __ATTR(release_region, 0600,
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show_release_region,
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store_release_region);
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static int __init phyp_dump_setup(void)
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{
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struct device_node *rtas;
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const struct phyp_dump_header *dump_header = NULL;
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unsigned long dump_area_start;
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unsigned long dump_area_length;
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int header_len = 0;
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int rc;
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/* If no memory was reserved in early boot, there is nothing to do */
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if (phyp_dump_info->init_reserve_size == 0)
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return 0;
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/* Return if phyp dump not supported */
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if (!phyp_dump_info->phyp_dump_configured)
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return -ENOSYS;
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/* Is there dump data waiting for us? If there isn't,
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* then register a new dump area, and release all of
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* the rest of the reserved ram.
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*
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* The /rtas/ibm,kernel-dump rtas node is present only
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* if there is dump data waiting for us.
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*/
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rtas = of_find_node_by_path("/rtas");
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if (rtas) {
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dump_header = of_get_property(rtas, "ibm,kernel-dump",
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&header_len);
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of_node_put(rtas);
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}
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print_dump_header(dump_header);
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dump_area_length = init_dump_header(&phdr);
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/* align down */
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dump_area_start = phyp_dump_info->init_reserve_start & PAGE_MASK;
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if (dump_header == NULL) {
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register_dump_area(&phdr, dump_area_start);
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return 0;
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}
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/* re-register the dump area, if old dump was invalid */
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if ((dump_header) && (dump_header->status & DUMP_ERROR_FLAG)) {
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invalidate_last_dump(&phdr, dump_area_start);
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register_dump_area(&phdr, dump_area_start);
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return 0;
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}
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if (dump_header) {
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phyp_dump_info->reserved_scratch_addr =
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dump_header->cpu_data.destination_address;
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phyp_dump_info->reserved_scratch_size =
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dump_header->cpu_data.source_length +
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dump_header->hpte_data.source_length +
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dump_header->kernel_data.source_length;
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}
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/* Should we create a dump_subsys, analogous to s390/ipl.c ? */
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rc = sysfs_create_file(kernel_kobj, &rr.attr);
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if (rc)
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printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n",
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rc);
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/* ToDo: re-register the dump area, for next time. */
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return 0;
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}
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machine_subsys_initcall(pseries, phyp_dump_setup);
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int __init early_init_dt_scan_phyp_dump(unsigned long node,
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const char *uname, int depth, void *data)
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{
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const unsigned int *sizes;
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phyp_dump_info->phyp_dump_configured = 0;
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phyp_dump_info->phyp_dump_is_active = 0;
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if (depth != 1 || strcmp(uname, "rtas") != 0)
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return 0;
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if (of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL))
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phyp_dump_info->phyp_dump_configured++;
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if (of_get_flat_dt_prop(node, "ibm,dump-kernel", NULL))
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phyp_dump_info->phyp_dump_is_active++;
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sizes = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
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NULL);
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if (!sizes)
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return 0;
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if (sizes[0] == 1)
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phyp_dump_info->cpu_state_size = *((unsigned long *)&sizes[1]);
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if (sizes[3] == 2)
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phyp_dump_info->hpte_region_size =
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*((unsigned long *)&sizes[4]);
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return 1;
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}
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/* Look for phyp_dump= cmdline option */
|
|
static int __init early_phyp_dump_enabled(char *p)
|
|
{
|
|
phyp_dump_info->phyp_dump_at_boot = 1;
|
|
|
|
if (!p)
|
|
return 0;
|
|
|
|
if (strncmp(p, "1", 1) == 0)
|
|
phyp_dump_info->phyp_dump_at_boot = 1;
|
|
else if (strncmp(p, "0", 1) == 0)
|
|
phyp_dump_info->phyp_dump_at_boot = 0;
|
|
|
|
return 0;
|
|
}
|
|
early_param("phyp_dump", early_phyp_dump_enabled);
|
|
|
|
/* Look for phyp_dump_reserve_size= cmdline option */
|
|
static int __init early_phyp_dump_reserve_size(char *p)
|
|
{
|
|
if (p)
|
|
phyp_dump_info->reserve_bootvar = memparse(p, &p);
|
|
|
|
return 0;
|
|
}
|
|
early_param("phyp_dump_reserve_size", early_phyp_dump_reserve_size);
|