mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e264abeaf9
The pstore conversion to timespec64 introduces its own method of passing seconds into sscanf() and sprintf() type functions to work around the timespec64 definition on 64-bit systems that redefine it to 'timespec'. That hack is now finally getting removed, but that means we get a (harmless) warning once both patches are merged: fs/pstore/ram.c: In function 'ramoops_read_kmsg_hdr': fs/pstore/ram.c:39:29: error: format '%ld' expects argument of type 'long int *', but argument 3 has type 'time64_t *' {aka 'long long int *'} [-Werror=format=] #define RAMOOPS_KERNMSG_HDR "====" ^~~~~~ fs/pstore/ram.c:167:21: note: in expansion of macro 'RAMOOPS_KERNMSG_HDR' This removes the pstore specific workaround and uses the same method that we have in place for all other functions that print a timespec64. Related to this, I found that the kasprintf() output contains an incorrect nanosecond values for any number starting with zeroes, and I adapt the format string accordingly. Link: https://lkml.org/lkml/2018/5/19/115 Link: https://lkml.org/lkml/2018/5/16/1080 Fixes: 0f0d83b99ef7 ("pstore: Convert internal records to timespec64") Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
956 lines
24 KiB
C
956 lines
24 KiB
C
/*
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* RAM Oops/Panic logger
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*
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* Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
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* Copyright (C) 2011 Kees Cook <keescook@chromium.org>
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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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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/pstore.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/compiler.h>
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#include <linux/pstore_ram.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#define RAMOOPS_KERNMSG_HDR "===="
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#define MIN_MEM_SIZE 4096UL
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static ulong record_size = MIN_MEM_SIZE;
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module_param(record_size, ulong, 0400);
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MODULE_PARM_DESC(record_size,
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"size of each dump done on oops/panic");
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static ulong ramoops_console_size = MIN_MEM_SIZE;
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module_param_named(console_size, ramoops_console_size, ulong, 0400);
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MODULE_PARM_DESC(console_size, "size of kernel console log");
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static ulong ramoops_ftrace_size = MIN_MEM_SIZE;
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module_param_named(ftrace_size, ramoops_ftrace_size, ulong, 0400);
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MODULE_PARM_DESC(ftrace_size, "size of ftrace log");
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static ulong ramoops_pmsg_size = MIN_MEM_SIZE;
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module_param_named(pmsg_size, ramoops_pmsg_size, ulong, 0400);
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MODULE_PARM_DESC(pmsg_size, "size of user space message log");
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static unsigned long long mem_address;
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module_param_hw(mem_address, ullong, other, 0400);
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MODULE_PARM_DESC(mem_address,
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"start of reserved RAM used to store oops/panic logs");
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static ulong mem_size;
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module_param(mem_size, ulong, 0400);
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MODULE_PARM_DESC(mem_size,
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"size of reserved RAM used to store oops/panic logs");
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static unsigned int mem_type;
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module_param(mem_type, uint, 0600);
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MODULE_PARM_DESC(mem_type,
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"set to 1 to try to use unbuffered memory (default 0)");
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static int dump_oops = 1;
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module_param(dump_oops, int, 0600);
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MODULE_PARM_DESC(dump_oops,
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"set to 1 to dump oopses, 0 to only dump panics (default 1)");
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static int ramoops_ecc;
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module_param_named(ecc, ramoops_ecc, int, 0600);
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MODULE_PARM_DESC(ramoops_ecc,
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"if non-zero, the option enables ECC support and specifies "
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"ECC buffer size in bytes (1 is a special value, means 16 "
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"bytes ECC)");
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struct ramoops_context {
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struct persistent_ram_zone **dprzs; /* Oops dump zones */
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struct persistent_ram_zone *cprz; /* Console zone */
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struct persistent_ram_zone **fprzs; /* Ftrace zones */
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struct persistent_ram_zone *mprz; /* PMSG zone */
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phys_addr_t phys_addr;
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unsigned long size;
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unsigned int memtype;
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size_t record_size;
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size_t console_size;
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size_t ftrace_size;
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size_t pmsg_size;
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int dump_oops;
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u32 flags;
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struct persistent_ram_ecc_info ecc_info;
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unsigned int max_dump_cnt;
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unsigned int dump_write_cnt;
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/* _read_cnt need clear on ramoops_pstore_open */
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unsigned int dump_read_cnt;
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unsigned int console_read_cnt;
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unsigned int max_ftrace_cnt;
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unsigned int ftrace_read_cnt;
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unsigned int pmsg_read_cnt;
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struct pstore_info pstore;
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};
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static struct platform_device *dummy;
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static struct ramoops_platform_data *dummy_data;
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static int ramoops_pstore_open(struct pstore_info *psi)
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{
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struct ramoops_context *cxt = psi->data;
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cxt->dump_read_cnt = 0;
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cxt->console_read_cnt = 0;
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cxt->ftrace_read_cnt = 0;
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cxt->pmsg_read_cnt = 0;
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return 0;
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}
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static struct persistent_ram_zone *
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ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
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u64 *id,
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enum pstore_type_id *typep, enum pstore_type_id type,
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bool update)
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{
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struct persistent_ram_zone *prz;
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int i = (*c)++;
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/* Give up if we never existed or have hit the end. */
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if (!przs || i >= max)
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return NULL;
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prz = przs[i];
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if (!prz)
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return NULL;
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/* Update old/shadowed buffer. */
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if (update)
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persistent_ram_save_old(prz);
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if (!persistent_ram_old_size(prz))
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return NULL;
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*typep = type;
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*id = i;
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return prz;
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}
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static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time,
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bool *compressed)
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{
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char data_type;
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int header_length = 0;
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if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n",
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(time64_t *)&time->tv_sec, &time->tv_nsec, &data_type,
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&header_length) == 3) {
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if (data_type == 'C')
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*compressed = true;
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else
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*compressed = false;
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} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n",
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(time64_t *)&time->tv_sec, &time->tv_nsec,
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&header_length) == 2) {
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*compressed = false;
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} else {
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time->tv_sec = 0;
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time->tv_nsec = 0;
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*compressed = false;
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}
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return header_length;
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}
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static bool prz_ok(struct persistent_ram_zone *prz)
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{
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return !!prz && !!(persistent_ram_old_size(prz) +
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persistent_ram_ecc_string(prz, NULL, 0));
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}
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static ssize_t ftrace_log_combine(struct persistent_ram_zone *dest,
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struct persistent_ram_zone *src)
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{
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size_t dest_size, src_size, total, dest_off, src_off;
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size_t dest_idx = 0, src_idx = 0, merged_idx = 0;
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void *merged_buf;
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struct pstore_ftrace_record *drec, *srec, *mrec;
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size_t record_size = sizeof(struct pstore_ftrace_record);
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dest_off = dest->old_log_size % record_size;
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dest_size = dest->old_log_size - dest_off;
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src_off = src->old_log_size % record_size;
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src_size = src->old_log_size - src_off;
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total = dest_size + src_size;
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merged_buf = kmalloc(total, GFP_KERNEL);
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if (!merged_buf)
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return -ENOMEM;
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drec = (struct pstore_ftrace_record *)(dest->old_log + dest_off);
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srec = (struct pstore_ftrace_record *)(src->old_log + src_off);
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mrec = (struct pstore_ftrace_record *)(merged_buf);
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while (dest_size > 0 && src_size > 0) {
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if (pstore_ftrace_read_timestamp(&drec[dest_idx]) <
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pstore_ftrace_read_timestamp(&srec[src_idx])) {
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mrec[merged_idx++] = drec[dest_idx++];
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dest_size -= record_size;
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} else {
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mrec[merged_idx++] = srec[src_idx++];
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src_size -= record_size;
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}
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}
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while (dest_size > 0) {
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mrec[merged_idx++] = drec[dest_idx++];
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dest_size -= record_size;
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}
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while (src_size > 0) {
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mrec[merged_idx++] = srec[src_idx++];
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src_size -= record_size;
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}
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kfree(dest->old_log);
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dest->old_log = merged_buf;
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dest->old_log_size = total;
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return 0;
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}
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static ssize_t ramoops_pstore_read(struct pstore_record *record)
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{
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ssize_t size = 0;
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struct ramoops_context *cxt = record->psi->data;
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struct persistent_ram_zone *prz = NULL;
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int header_length = 0;
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bool free_prz = false;
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/*
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* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
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* PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
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* valid time stamps, so it is initialized to zero.
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*/
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record->time.tv_sec = 0;
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record->time.tv_nsec = 0;
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record->compressed = false;
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/* Find the next valid persistent_ram_zone for DMESG */
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while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
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prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
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cxt->max_dump_cnt, &record->id,
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&record->type,
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PSTORE_TYPE_DMESG, 1);
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if (!prz_ok(prz))
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continue;
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header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
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&record->time,
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&record->compressed);
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/* Clear and skip this DMESG record if it has no valid header */
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if (!header_length) {
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persistent_ram_free_old(prz);
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persistent_ram_zap(prz);
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prz = NULL;
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}
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}
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if (!prz_ok(prz))
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prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
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1, &record->id, &record->type,
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PSTORE_TYPE_CONSOLE, 0);
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if (!prz_ok(prz))
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prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
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1, &record->id, &record->type,
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PSTORE_TYPE_PMSG, 0);
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/* ftrace is last since it may want to dynamically allocate memory. */
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if (!prz_ok(prz)) {
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if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
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prz = ramoops_get_next_prz(cxt->fprzs,
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&cxt->ftrace_read_cnt, 1, &record->id,
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&record->type, PSTORE_TYPE_FTRACE, 0);
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} else {
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/*
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* Build a new dummy record which combines all the
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* per-cpu records including metadata and ecc info.
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*/
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struct persistent_ram_zone *tmp_prz, *prz_next;
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tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
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GFP_KERNEL);
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if (!tmp_prz)
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return -ENOMEM;
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free_prz = true;
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while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
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prz_next = ramoops_get_next_prz(cxt->fprzs,
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&cxt->ftrace_read_cnt,
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cxt->max_ftrace_cnt,
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&record->id,
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&record->type,
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PSTORE_TYPE_FTRACE, 0);
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if (!prz_ok(prz_next))
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continue;
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tmp_prz->ecc_info = prz_next->ecc_info;
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tmp_prz->corrected_bytes +=
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prz_next->corrected_bytes;
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tmp_prz->bad_blocks += prz_next->bad_blocks;
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size = ftrace_log_combine(tmp_prz, prz_next);
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if (size)
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goto out;
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}
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record->id = 0;
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prz = tmp_prz;
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}
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}
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if (!prz_ok(prz)) {
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size = 0;
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goto out;
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}
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size = persistent_ram_old_size(prz) - header_length;
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/* ECC correction notice */
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record->ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
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record->buf = kmalloc(size + record->ecc_notice_size + 1, GFP_KERNEL);
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if (record->buf == NULL) {
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size = -ENOMEM;
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goto out;
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}
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memcpy(record->buf, (char *)persistent_ram_old(prz) + header_length,
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size);
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persistent_ram_ecc_string(prz, record->buf + size,
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record->ecc_notice_size + 1);
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out:
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if (free_prz) {
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kfree(prz->old_log);
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kfree(prz);
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}
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return size;
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}
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static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
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struct pstore_record *record)
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{
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char *hdr;
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size_t len;
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hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",
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(time64_t)record->time.tv_sec,
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record->time.tv_nsec / 1000,
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record->compressed ? 'C' : 'D');
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WARN_ON_ONCE(!hdr);
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len = hdr ? strlen(hdr) : 0;
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persistent_ram_write(prz, hdr, len);
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kfree(hdr);
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return len;
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}
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static int notrace ramoops_pstore_write(struct pstore_record *record)
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{
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struct ramoops_context *cxt = record->psi->data;
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struct persistent_ram_zone *prz;
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size_t size, hlen;
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if (record->type == PSTORE_TYPE_CONSOLE) {
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if (!cxt->cprz)
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return -ENOMEM;
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persistent_ram_write(cxt->cprz, record->buf, record->size);
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return 0;
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} else if (record->type == PSTORE_TYPE_FTRACE) {
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int zonenum;
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if (!cxt->fprzs)
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return -ENOMEM;
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/*
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* Choose zone by if we're using per-cpu buffers.
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*/
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if (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
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zonenum = smp_processor_id();
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else
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zonenum = 0;
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persistent_ram_write(cxt->fprzs[zonenum], record->buf,
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record->size);
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return 0;
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} else if (record->type == PSTORE_TYPE_PMSG) {
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pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);
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return -EINVAL;
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}
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if (record->type != PSTORE_TYPE_DMESG)
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return -EINVAL;
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/*
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* Out of the various dmesg dump types, ramoops is currently designed
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* to only store crash logs, rather than storing general kernel logs.
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*/
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if (record->reason != KMSG_DUMP_OOPS &&
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record->reason != KMSG_DUMP_PANIC)
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return -EINVAL;
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/* Skip Oopes when configured to do so. */
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if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)
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return -EINVAL;
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/*
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* Explicitly only take the first part of any new crash.
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* If our buffer is larger than kmsg_bytes, this can never happen,
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* and if our buffer is smaller than kmsg_bytes, we don't want the
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* report split across multiple records.
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*/
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if (record->part != 1)
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return -ENOSPC;
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if (!cxt->dprzs)
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return -ENOSPC;
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prz = cxt->dprzs[cxt->dump_write_cnt];
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/* Build header and append record contents. */
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hlen = ramoops_write_kmsg_hdr(prz, record);
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size = record->size;
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if (size + hlen > prz->buffer_size)
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size = prz->buffer_size - hlen;
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persistent_ram_write(prz, record->buf, size);
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cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;
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return 0;
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}
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static int notrace ramoops_pstore_write_user(struct pstore_record *record,
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const char __user *buf)
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{
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if (record->type == PSTORE_TYPE_PMSG) {
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struct ramoops_context *cxt = record->psi->data;
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if (!cxt->mprz)
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return -ENOMEM;
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return persistent_ram_write_user(cxt->mprz, buf, record->size);
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}
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return -EINVAL;
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}
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static int ramoops_pstore_erase(struct pstore_record *record)
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{
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struct ramoops_context *cxt = record->psi->data;
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struct persistent_ram_zone *prz;
|
|
|
|
switch (record->type) {
|
|
case PSTORE_TYPE_DMESG:
|
|
if (record->id >= cxt->max_dump_cnt)
|
|
return -EINVAL;
|
|
prz = cxt->dprzs[record->id];
|
|
break;
|
|
case PSTORE_TYPE_CONSOLE:
|
|
prz = cxt->cprz;
|
|
break;
|
|
case PSTORE_TYPE_FTRACE:
|
|
if (record->id >= cxt->max_ftrace_cnt)
|
|
return -EINVAL;
|
|
prz = cxt->fprzs[record->id];
|
|
break;
|
|
case PSTORE_TYPE_PMSG:
|
|
prz = cxt->mprz;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
persistent_ram_free_old(prz);
|
|
persistent_ram_zap(prz);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct ramoops_context oops_cxt = {
|
|
.pstore = {
|
|
.owner = THIS_MODULE,
|
|
.name = "ramoops",
|
|
.open = ramoops_pstore_open,
|
|
.read = ramoops_pstore_read,
|
|
.write = ramoops_pstore_write,
|
|
.write_user = ramoops_pstore_write_user,
|
|
.erase = ramoops_pstore_erase,
|
|
},
|
|
};
|
|
|
|
static void ramoops_free_przs(struct ramoops_context *cxt)
|
|
{
|
|
int i;
|
|
|
|
/* Free dump PRZs */
|
|
if (cxt->dprzs) {
|
|
for (i = 0; i < cxt->max_dump_cnt; i++)
|
|
persistent_ram_free(cxt->dprzs[i]);
|
|
|
|
kfree(cxt->dprzs);
|
|
cxt->max_dump_cnt = 0;
|
|
}
|
|
|
|
/* Free ftrace PRZs */
|
|
if (cxt->fprzs) {
|
|
for (i = 0; i < cxt->max_ftrace_cnt; i++)
|
|
persistent_ram_free(cxt->fprzs[i]);
|
|
kfree(cxt->fprzs);
|
|
cxt->max_ftrace_cnt = 0;
|
|
}
|
|
}
|
|
|
|
static int ramoops_init_przs(const char *name,
|
|
struct device *dev, struct ramoops_context *cxt,
|
|
struct persistent_ram_zone ***przs,
|
|
phys_addr_t *paddr, size_t mem_sz,
|
|
ssize_t record_size,
|
|
unsigned int *cnt, u32 sig, u32 flags)
|
|
{
|
|
int err = -ENOMEM;
|
|
int i;
|
|
size_t zone_sz;
|
|
struct persistent_ram_zone **prz_ar;
|
|
|
|
/* Allocate nothing for 0 mem_sz or 0 record_size. */
|
|
if (mem_sz == 0 || record_size == 0) {
|
|
*cnt = 0;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If we have a negative record size, calculate it based on
|
|
* mem_sz / *cnt. If we have a positive record size, calculate
|
|
* cnt from mem_sz / record_size.
|
|
*/
|
|
if (record_size < 0) {
|
|
if (*cnt == 0)
|
|
return 0;
|
|
record_size = mem_sz / *cnt;
|
|
if (record_size == 0) {
|
|
dev_err(dev, "%s record size == 0 (%zu / %u)\n",
|
|
name, mem_sz, *cnt);
|
|
goto fail;
|
|
}
|
|
} else {
|
|
*cnt = mem_sz / record_size;
|
|
if (*cnt == 0) {
|
|
dev_err(dev, "%s record count == 0 (%zu / %zu)\n",
|
|
name, mem_sz, record_size);
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (*paddr + mem_sz - cxt->phys_addr > cxt->size) {
|
|
dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
|
|
name,
|
|
mem_sz, (unsigned long long)*paddr,
|
|
cxt->size, (unsigned long long)cxt->phys_addr);
|
|
goto fail;
|
|
}
|
|
|
|
zone_sz = mem_sz / *cnt;
|
|
if (!zone_sz) {
|
|
dev_err(dev, "%s zone size == 0\n", name);
|
|
goto fail;
|
|
}
|
|
|
|
prz_ar = kcalloc(*cnt, sizeof(**przs), GFP_KERNEL);
|
|
if (!prz_ar)
|
|
goto fail;
|
|
|
|
for (i = 0; i < *cnt; i++) {
|
|
prz_ar[i] = persistent_ram_new(*paddr, zone_sz, sig,
|
|
&cxt->ecc_info,
|
|
cxt->memtype, flags);
|
|
if (IS_ERR(prz_ar[i])) {
|
|
err = PTR_ERR(prz_ar[i]);
|
|
dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
|
|
name, record_size,
|
|
(unsigned long long)*paddr, err);
|
|
|
|
while (i > 0) {
|
|
i--;
|
|
persistent_ram_free(prz_ar[i]);
|
|
}
|
|
kfree(prz_ar);
|
|
goto fail;
|
|
}
|
|
*paddr += zone_sz;
|
|
}
|
|
|
|
*przs = prz_ar;
|
|
return 0;
|
|
|
|
fail:
|
|
*cnt = 0;
|
|
return err;
|
|
}
|
|
|
|
static int ramoops_init_prz(const char *name,
|
|
struct device *dev, struct ramoops_context *cxt,
|
|
struct persistent_ram_zone **prz,
|
|
phys_addr_t *paddr, size_t sz, u32 sig)
|
|
{
|
|
if (!sz)
|
|
return 0;
|
|
|
|
if (*paddr + sz - cxt->phys_addr > cxt->size) {
|
|
dev_err(dev, "no room for %s mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",
|
|
name, sz, (unsigned long long)*paddr,
|
|
cxt->size, (unsigned long long)cxt->phys_addr);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*prz = persistent_ram_new(*paddr, sz, sig, &cxt->ecc_info,
|
|
cxt->memtype, 0);
|
|
if (IS_ERR(*prz)) {
|
|
int err = PTR_ERR(*prz);
|
|
|
|
dev_err(dev, "failed to request %s mem region (0x%zx@0x%llx): %d\n",
|
|
name, sz, (unsigned long long)*paddr, err);
|
|
return err;
|
|
}
|
|
|
|
persistent_ram_zap(*prz);
|
|
|
|
*paddr += sz;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ramoops_parse_dt_size(struct platform_device *pdev,
|
|
const char *propname, u32 *value)
|
|
{
|
|
u32 val32 = 0;
|
|
int ret;
|
|
|
|
ret = of_property_read_u32(pdev->dev.of_node, propname, &val32);
|
|
if (ret < 0 && ret != -EINVAL) {
|
|
dev_err(&pdev->dev, "failed to parse property %s: %d\n",
|
|
propname, ret);
|
|
return ret;
|
|
}
|
|
|
|
if (val32 > INT_MAX) {
|
|
dev_err(&pdev->dev, "%s %u > INT_MAX\n", propname, val32);
|
|
return -EOVERFLOW;
|
|
}
|
|
|
|
*value = val32;
|
|
return 0;
|
|
}
|
|
|
|
static int ramoops_parse_dt(struct platform_device *pdev,
|
|
struct ramoops_platform_data *pdata)
|
|
{
|
|
struct device_node *of_node = pdev->dev.of_node;
|
|
struct resource *res;
|
|
u32 value;
|
|
int ret;
|
|
|
|
dev_dbg(&pdev->dev, "using Device Tree\n");
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res) {
|
|
dev_err(&pdev->dev,
|
|
"failed to locate DT /reserved-memory resource\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pdata->mem_size = resource_size(res);
|
|
pdata->mem_address = res->start;
|
|
pdata->mem_type = of_property_read_bool(of_node, "unbuffered");
|
|
pdata->dump_oops = !of_property_read_bool(of_node, "no-dump-oops");
|
|
|
|
#define parse_size(name, field) { \
|
|
ret = ramoops_parse_dt_size(pdev, name, &value); \
|
|
if (ret < 0) \
|
|
return ret; \
|
|
field = value; \
|
|
}
|
|
|
|
parse_size("record-size", pdata->record_size);
|
|
parse_size("console-size", pdata->console_size);
|
|
parse_size("ftrace-size", pdata->ftrace_size);
|
|
parse_size("pmsg-size", pdata->pmsg_size);
|
|
parse_size("ecc-size", pdata->ecc_info.ecc_size);
|
|
parse_size("flags", pdata->flags);
|
|
|
|
#undef parse_size
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ramoops_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct ramoops_platform_data *pdata = dev->platform_data;
|
|
struct ramoops_context *cxt = &oops_cxt;
|
|
size_t dump_mem_sz;
|
|
phys_addr_t paddr;
|
|
int err = -EINVAL;
|
|
|
|
if (dev_of_node(dev) && !pdata) {
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata) {
|
|
pr_err("cannot allocate platform data buffer\n");
|
|
err = -ENOMEM;
|
|
goto fail_out;
|
|
}
|
|
|
|
err = ramoops_parse_dt(pdev, pdata);
|
|
if (err < 0)
|
|
goto fail_out;
|
|
}
|
|
|
|
/*
|
|
* Only a single ramoops area allowed at a time, so fail extra
|
|
* probes.
|
|
*/
|
|
if (cxt->max_dump_cnt) {
|
|
pr_err("already initialized\n");
|
|
goto fail_out;
|
|
}
|
|
|
|
/* Make sure we didn't get bogus platform data pointer. */
|
|
if (!pdata) {
|
|
pr_err("NULL platform data\n");
|
|
goto fail_out;
|
|
}
|
|
|
|
if (!pdata->mem_size || (!pdata->record_size && !pdata->console_size &&
|
|
!pdata->ftrace_size && !pdata->pmsg_size)) {
|
|
pr_err("The memory size and the record/console size must be "
|
|
"non-zero\n");
|
|
goto fail_out;
|
|
}
|
|
|
|
if (pdata->record_size && !is_power_of_2(pdata->record_size))
|
|
pdata->record_size = rounddown_pow_of_two(pdata->record_size);
|
|
if (pdata->console_size && !is_power_of_2(pdata->console_size))
|
|
pdata->console_size = rounddown_pow_of_two(pdata->console_size);
|
|
if (pdata->ftrace_size && !is_power_of_2(pdata->ftrace_size))
|
|
pdata->ftrace_size = rounddown_pow_of_two(pdata->ftrace_size);
|
|
if (pdata->pmsg_size && !is_power_of_2(pdata->pmsg_size))
|
|
pdata->pmsg_size = rounddown_pow_of_two(pdata->pmsg_size);
|
|
|
|
cxt->size = pdata->mem_size;
|
|
cxt->phys_addr = pdata->mem_address;
|
|
cxt->memtype = pdata->mem_type;
|
|
cxt->record_size = pdata->record_size;
|
|
cxt->console_size = pdata->console_size;
|
|
cxt->ftrace_size = pdata->ftrace_size;
|
|
cxt->pmsg_size = pdata->pmsg_size;
|
|
cxt->dump_oops = pdata->dump_oops;
|
|
cxt->flags = pdata->flags;
|
|
cxt->ecc_info = pdata->ecc_info;
|
|
|
|
paddr = cxt->phys_addr;
|
|
|
|
dump_mem_sz = cxt->size - cxt->console_size - cxt->ftrace_size
|
|
- cxt->pmsg_size;
|
|
err = ramoops_init_przs("dump", dev, cxt, &cxt->dprzs, &paddr,
|
|
dump_mem_sz, cxt->record_size,
|
|
&cxt->max_dump_cnt, 0, 0);
|
|
if (err)
|
|
goto fail_out;
|
|
|
|
err = ramoops_init_prz("console", dev, cxt, &cxt->cprz, &paddr,
|
|
cxt->console_size, 0);
|
|
if (err)
|
|
goto fail_init_cprz;
|
|
|
|
cxt->max_ftrace_cnt = (cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
|
|
? nr_cpu_ids
|
|
: 1;
|
|
err = ramoops_init_przs("ftrace", dev, cxt, &cxt->fprzs, &paddr,
|
|
cxt->ftrace_size, -1,
|
|
&cxt->max_ftrace_cnt, LINUX_VERSION_CODE,
|
|
(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)
|
|
? PRZ_FLAG_NO_LOCK : 0);
|
|
if (err)
|
|
goto fail_init_fprz;
|
|
|
|
err = ramoops_init_prz("pmsg", dev, cxt, &cxt->mprz, &paddr,
|
|
cxt->pmsg_size, 0);
|
|
if (err)
|
|
goto fail_init_mprz;
|
|
|
|
cxt->pstore.data = cxt;
|
|
/*
|
|
* Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
|
|
* have to handle dumps, we must have at least record_size buffer. And
|
|
* for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
|
|
* ZERO_SIZE_PTR).
|
|
*/
|
|
if (cxt->console_size)
|
|
cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
|
|
cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
|
|
cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
|
|
if (!cxt->pstore.buf) {
|
|
pr_err("cannot allocate pstore buffer\n");
|
|
err = -ENOMEM;
|
|
goto fail_clear;
|
|
}
|
|
spin_lock_init(&cxt->pstore.buf_lock);
|
|
|
|
cxt->pstore.flags = PSTORE_FLAGS_DMESG;
|
|
if (cxt->console_size)
|
|
cxt->pstore.flags |= PSTORE_FLAGS_CONSOLE;
|
|
if (cxt->ftrace_size)
|
|
cxt->pstore.flags |= PSTORE_FLAGS_FTRACE;
|
|
if (cxt->pmsg_size)
|
|
cxt->pstore.flags |= PSTORE_FLAGS_PMSG;
|
|
|
|
err = pstore_register(&cxt->pstore);
|
|
if (err) {
|
|
pr_err("registering with pstore failed\n");
|
|
goto fail_buf;
|
|
}
|
|
|
|
/*
|
|
* Update the module parameter variables as well so they are visible
|
|
* through /sys/module/ramoops/parameters/
|
|
*/
|
|
mem_size = pdata->mem_size;
|
|
mem_address = pdata->mem_address;
|
|
record_size = pdata->record_size;
|
|
dump_oops = pdata->dump_oops;
|
|
ramoops_console_size = pdata->console_size;
|
|
ramoops_pmsg_size = pdata->pmsg_size;
|
|
ramoops_ftrace_size = pdata->ftrace_size;
|
|
|
|
pr_info("attached 0x%lx@0x%llx, ecc: %d/%d\n",
|
|
cxt->size, (unsigned long long)cxt->phys_addr,
|
|
cxt->ecc_info.ecc_size, cxt->ecc_info.block_size);
|
|
|
|
return 0;
|
|
|
|
fail_buf:
|
|
kfree(cxt->pstore.buf);
|
|
fail_clear:
|
|
cxt->pstore.bufsize = 0;
|
|
persistent_ram_free(cxt->mprz);
|
|
fail_init_mprz:
|
|
fail_init_fprz:
|
|
persistent_ram_free(cxt->cprz);
|
|
fail_init_cprz:
|
|
ramoops_free_przs(cxt);
|
|
fail_out:
|
|
return err;
|
|
}
|
|
|
|
static int ramoops_remove(struct platform_device *pdev)
|
|
{
|
|
struct ramoops_context *cxt = &oops_cxt;
|
|
|
|
pstore_unregister(&cxt->pstore);
|
|
|
|
kfree(cxt->pstore.buf);
|
|
cxt->pstore.bufsize = 0;
|
|
|
|
persistent_ram_free(cxt->mprz);
|
|
persistent_ram_free(cxt->cprz);
|
|
ramoops_free_przs(cxt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id dt_match[] = {
|
|
{ .compatible = "ramoops" },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver ramoops_driver = {
|
|
.probe = ramoops_probe,
|
|
.remove = ramoops_remove,
|
|
.driver = {
|
|
.name = "ramoops",
|
|
.of_match_table = dt_match,
|
|
},
|
|
};
|
|
|
|
static void ramoops_register_dummy(void)
|
|
{
|
|
if (!mem_size)
|
|
return;
|
|
|
|
pr_info("using module parameters\n");
|
|
|
|
dummy_data = kzalloc(sizeof(*dummy_data), GFP_KERNEL);
|
|
if (!dummy_data) {
|
|
pr_info("could not allocate pdata\n");
|
|
return;
|
|
}
|
|
|
|
dummy_data->mem_size = mem_size;
|
|
dummy_data->mem_address = mem_address;
|
|
dummy_data->mem_type = mem_type;
|
|
dummy_data->record_size = record_size;
|
|
dummy_data->console_size = ramoops_console_size;
|
|
dummy_data->ftrace_size = ramoops_ftrace_size;
|
|
dummy_data->pmsg_size = ramoops_pmsg_size;
|
|
dummy_data->dump_oops = dump_oops;
|
|
dummy_data->flags = RAMOOPS_FLAG_FTRACE_PER_CPU;
|
|
|
|
/*
|
|
* For backwards compatibility ramoops.ecc=1 means 16 bytes ECC
|
|
* (using 1 byte for ECC isn't much of use anyway).
|
|
*/
|
|
dummy_data->ecc_info.ecc_size = ramoops_ecc == 1 ? 16 : ramoops_ecc;
|
|
|
|
dummy = platform_device_register_data(NULL, "ramoops", -1,
|
|
dummy_data, sizeof(struct ramoops_platform_data));
|
|
if (IS_ERR(dummy)) {
|
|
pr_info("could not create platform device: %ld\n",
|
|
PTR_ERR(dummy));
|
|
}
|
|
}
|
|
|
|
static int __init ramoops_init(void)
|
|
{
|
|
ramoops_register_dummy();
|
|
return platform_driver_register(&ramoops_driver);
|
|
}
|
|
late_initcall(ramoops_init);
|
|
|
|
static void __exit ramoops_exit(void)
|
|
{
|
|
platform_driver_unregister(&ramoops_driver);
|
|
platform_device_unregister(dummy);
|
|
kfree(dummy_data);
|
|
}
|
|
module_exit(ramoops_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Marco Stornelli <marco.stornelli@gmail.com>");
|
|
MODULE_DESCRIPTION("RAM Oops/Panic logger/driver");
|