2005-04-17 02:20:36 +04:00
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/*
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* salinfo.c
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*
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* Creates entries in /proc/sal for various system features.
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*
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2006-01-06 02:36:06 +03:00
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* Copyright (c) 2003, 2006 Silicon Graphics, Inc. All rights reserved.
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2005-04-17 02:20:36 +04:00
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* Copyright (c) 2003 Hewlett-Packard Co
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*
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* 10/30/2001 jbarnes@sgi.com copied much of Stephane's palinfo
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* code to create this file
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* Oct 23 2003 kaos@sgi.com
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* Replace IPI with set_cpus_allowed() to read a record from the required cpu.
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* Redesign salinfo log processing to separate interrupt and user space
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* contexts.
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* Cache the record across multi-block reads from user space.
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* Support > 64 cpus.
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* Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
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*
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* Jan 28 2004 kaos@sgi.com
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* Periodically check for outstanding MCA or INIT records.
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*
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* Dec 5 2004 kaos@sgi.com
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* Standardize which records are cleared automatically.
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2005-09-11 11:21:46 +04:00
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*
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* Aug 18 2005 kaos@sgi.com
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* mca.c may not pass a buffer, a NULL buffer just indicates that a new
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* record is available in SAL.
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* Replace some NR_CPUS by cpus_online, for hotplug cpu.
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2006-01-06 02:36:06 +03:00
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*
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* Jan 5 2006 kaos@sgi.com
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* Handle hotplug cpus coming online.
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* Handle hotplug cpus going offline while they still have outstanding records.
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* Use the cpu_* macros consistently.
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* Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
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* Modify the locking to make the test for "work to do" an atomic operation.
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2005-04-17 02:20:36 +04:00
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*/
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2006-01-11 23:17:48 +03:00
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#include <linux/capability.h>
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2006-01-06 02:36:06 +03:00
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#include <linux/cpu.h>
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2005-04-17 02:20:36 +04:00
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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2013-04-11 04:28:40 +04:00
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#include <linux/seq_file.h>
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2005-04-17 02:20:36 +04:00
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <linux/timer.h>
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#include <linux/vmalloc.h>
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2008-04-19 06:21:05 +04:00
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#include <linux/semaphore.h>
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2005-04-17 02:20:36 +04:00
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#include <asm/sal.h>
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2016-12-24 22:46:01 +03:00
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#include <linux/uaccess.h>
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2005-04-17 02:20:36 +04:00
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MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
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MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
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MODULE_LICENSE("GPL");
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typedef struct {
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const char *name; /* name of the proc entry */
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unsigned long feature; /* feature bit */
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struct proc_dir_entry *entry; /* registered entry (removal) */
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} salinfo_entry_t;
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/*
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* List {name,feature} pairs for every entry in /proc/sal/<feature>
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* that this module exports
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*/
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2013-04-11 04:28:40 +04:00
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static const salinfo_entry_t salinfo_entries[]={
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2005-04-17 02:20:36 +04:00
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{ "bus_lock", IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
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{ "irq_redirection", IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
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{ "ipi_redirection", IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
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{ "itc_drift", IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
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};
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#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
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static char *salinfo_log_name[] = {
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"mca",
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"init",
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"cmc",
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"cpe",
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};
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static struct proc_dir_entry *salinfo_proc_entries[
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ARRAY_SIZE(salinfo_entries) + /* /proc/sal/bus_lock */
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ARRAY_SIZE(salinfo_log_name) + /* /proc/sal/{mca,...} */
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(2 * ARRAY_SIZE(salinfo_log_name)) + /* /proc/sal/mca/{event,data} */
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1]; /* /proc/sal */
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/* Some records we get ourselves, some are accessed as saved data in buffers
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* that are owned by mca.c.
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*/
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struct salinfo_data_saved {
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u8* buffer;
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u64 size;
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u64 id;
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int cpu;
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};
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/* State transitions. Actions are :-
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* Write "read <cpunum>" to the data file.
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* Write "clear <cpunum>" to the data file.
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* Write "oemdata <cpunum> <offset> to the data file.
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* Read from the data file.
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* Close the data file.
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*
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* Start state is NO_DATA.
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*
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* NO_DATA
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* write "read <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "oemdata <cpunum> <offset> -> return -EINVAL.
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* read data -> return EOF.
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* close -> unchanged. Free record areas.
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*
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* LOG_RECORD
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* write "read <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
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* read data -> return the INIT/MCA/CMC/CPE record.
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* close -> unchanged. Keep record areas.
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*
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* OEMDATA
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* write "read <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
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* write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
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* read data -> return the formatted oemdata.
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* close -> unchanged. Keep record areas.
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*
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* Closing the data file does not change the state. This allows shell scripts
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* to manipulate salinfo data, each shell redirection opens the file, does one
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* action then closes it again. The record areas are only freed at close when
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* the state is NO_DATA.
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*/
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enum salinfo_state {
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STATE_NO_DATA,
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STATE_LOG_RECORD,
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STATE_OEMDATA,
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};
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struct salinfo_data {
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2006-01-06 02:36:06 +03:00
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cpumask_t cpu_event; /* which cpus have outstanding events */
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2016-07-25 11:43:13 +03:00
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wait_queue_head_t read_wait;
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2005-04-17 02:20:36 +04:00
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u8 *log_buffer;
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u64 log_size;
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u8 *oemdata; /* decoded oem data */
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u64 oemdata_size;
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int open; /* single-open to prevent races */
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u8 type;
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u8 saved_num; /* using a saved record? */
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enum salinfo_state state :8; /* processing state */
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u8 padding;
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int cpu_check; /* next CPU to check */
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struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
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};
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static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
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2005-07-31 04:52:00 +04:00
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static DEFINE_SPINLOCK(data_lock);
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static DEFINE_SPINLOCK(data_saved_lock);
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2005-04-17 02:20:36 +04:00
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/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
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* record.
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* @sect_header: pointer to the start of the section to decode.
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2007-05-12 01:55:43 +04:00
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* @oemdata: returns vmalloc area containing the decoded output.
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2005-04-17 02:20:36 +04:00
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* @oemdata_size: returns length of decoded output (strlen).
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*
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* Description: If user space asks for oem data to be decoded by the kernel
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* and/or prom and the platform has set salinfo_platform_oemdata to the address
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* of a platform specific routine then call that routine. salinfo_platform_oemdata
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* vmalloc's and formats its output area, returning the address of the text
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* and its strlen. Returns 0 for success, -ve for error. The callback is
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* invoked on the cpu that generated the error record.
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*/
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int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
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struct salinfo_platform_oemdata_parms {
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const u8 *efi_guid;
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u8 **oemdata;
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u64 *oemdata_size;
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};
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2017-04-12 23:07:29 +03:00
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static long
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2005-04-17 02:20:36 +04:00
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salinfo_platform_oemdata_cpu(void *context)
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{
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struct salinfo_platform_oemdata_parms *parms = context;
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2017-04-12 23:07:29 +03:00
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return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
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2005-04-17 02:20:36 +04:00
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}
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static void
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shift1_data_saved (struct salinfo_data *data, int shift)
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{
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memcpy(data->data_saved+shift, data->data_saved+shift+1,
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(ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
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memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
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sizeof(data->data_saved[0]));
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}
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/* This routine is invoked in interrupt context. Note: mca.c enables
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* interrupts before calling this code for CMC/CPE. MCA and INIT events are
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* not irq safe, do not call any routines that use spinlocks, they may deadlock.
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* MCA and INIT records are recorded, a timer event will look for any
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* outstanding events and wake up the user space code.
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*
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* The buffer passed from mca.c points to the output from ia64_log_get. This is
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* a persistent buffer but its contents can change between the interrupt and
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* when user space processes the record. Save the record id to identify
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2005-09-11 11:21:46 +04:00
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* changes. If the buffer is NULL then just update the bitmap.
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2005-04-17 02:20:36 +04:00
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*/
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void
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salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
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{
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struct salinfo_data *data = salinfo_data + type;
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struct salinfo_data_saved *data_saved;
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unsigned long flags = 0;
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int i;
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int saved_size = ARRAY_SIZE(data->data_saved);
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BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
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2006-01-06 02:36:06 +03:00
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if (irqsafe)
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spin_lock_irqsave(&data_saved_lock, flags);
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2005-09-11 11:21:46 +04:00
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if (buffer) {
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for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
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if (!data_saved->buffer)
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break;
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}
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if (i == saved_size) {
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if (!data->saved_num) {
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shift1_data_saved(data, 0);
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data_saved = data->data_saved + saved_size - 1;
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} else
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data_saved = NULL;
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}
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if (data_saved) {
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data_saved->cpu = smp_processor_id();
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data_saved->id = ((sal_log_record_header_t *)buffer)->id;
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data_saved->size = size;
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data_saved->buffer = buffer;
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}
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2005-04-17 02:20:36 +04:00
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}
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2015-03-05 03:19:16 +03:00
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cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
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2006-01-06 02:36:06 +03:00
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if (irqsafe) {
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2016-07-25 11:43:13 +03:00
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wake_up_interruptible(&data->read_wait);
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2006-01-06 02:36:06 +03:00
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spin_unlock_irqrestore(&data_saved_lock, flags);
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2005-04-17 02:20:36 +04:00
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}
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}
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/* Check for outstanding MCA/INIT records every minute (arbitrary) */
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#define SALINFO_TIMER_DELAY (60*HZ)
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static struct timer_list salinfo_timer;
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2006-09-27 01:44:37 +04:00
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extern void ia64_mlogbuf_dump(void);
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2005-04-17 02:20:36 +04:00
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static void
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salinfo_timeout_check(struct salinfo_data *data)
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{
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if (!data->open)
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return;
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2016-07-25 11:43:13 +03:00
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if (!cpumask_empty(&data->cpu_event))
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wake_up_interruptible(&data->read_wait);
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2005-04-17 02:20:36 +04:00
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}
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2006-01-06 02:36:06 +03:00
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static void
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2017-10-20 00:24:01 +03:00
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salinfo_timeout(struct timer_list *unused)
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2005-04-17 02:20:36 +04:00
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{
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2006-09-27 01:44:37 +04:00
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ia64_mlogbuf_dump();
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2005-04-17 02:20:36 +04:00
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salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
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salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
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salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
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add_timer(&salinfo_timer);
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}
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static int
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salinfo_event_open(struct inode *inode, struct file *file)
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{
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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return 0;
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}
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static ssize_t
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salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
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{
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2013-04-01 02:16:14 +04:00
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struct salinfo_data *data = PDE_DATA(file_inode(file));
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2005-04-17 02:20:36 +04:00
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char cmd[32];
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size_t size;
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int i, n, cpu = -1;
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retry:
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2016-07-25 11:43:13 +03:00
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if (cpumask_empty(&data->cpu_event)) {
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2005-04-17 02:20:36 +04:00
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if (file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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2016-07-25 11:43:13 +03:00
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if (wait_event_interruptible(data->read_wait,
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!cpumask_empty(&data->cpu_event)))
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2005-12-02 05:40:15 +03:00
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return -EINTR;
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2005-04-17 02:20:36 +04:00
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}
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n = data->cpu_check;
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2009-03-16 06:42:42 +03:00
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for (i = 0; i < nr_cpu_ids; i++) {
|
2015-03-05 03:19:16 +03:00
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if (cpumask_test_cpu(n, &data->cpu_event)) {
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2006-01-06 02:36:06 +03:00
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if (!cpu_online(n)) {
|
2015-03-05 03:19:16 +03:00
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cpumask_clear_cpu(n, &data->cpu_event);
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2006-01-06 02:36:06 +03:00
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continue;
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}
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2005-04-17 02:20:36 +04:00
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cpu = n;
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break;
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}
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2009-03-16 06:42:42 +03:00
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|
if (++n == nr_cpu_ids)
|
2005-04-17 02:20:36 +04:00
|
|
|
n = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (cpu == -1)
|
|
|
|
goto retry;
|
|
|
|
|
2006-09-27 01:44:37 +04:00
|
|
|
ia64_mlogbuf_dump();
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
/* for next read, start checking at next CPU */
|
|
|
|
data->cpu_check = cpu;
|
2009-03-16 06:42:42 +03:00
|
|
|
if (++data->cpu_check == nr_cpu_ids)
|
2005-04-17 02:20:36 +04:00
|
|
|
data->cpu_check = 0;
|
|
|
|
|
|
|
|
snprintf(cmd, sizeof(cmd), "read %d\n", cpu);
|
|
|
|
|
|
|
|
size = strlen(cmd);
|
|
|
|
if (size > count)
|
|
|
|
size = count;
|
|
|
|
if (copy_to_user(buffer, cmd, size))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return size;
|
|
|
|
}
|
|
|
|
|
2007-02-12 11:55:31 +03:00
|
|
|
static const struct file_operations salinfo_event_fops = {
|
2005-04-17 02:20:36 +04:00
|
|
|
.open = salinfo_event_open,
|
|
|
|
.read = salinfo_event_read,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 20:52:59 +04:00
|
|
|
.llseek = noop_llseek,
|
2005-04-17 02:20:36 +04:00
|
|
|
};
|
|
|
|
|
|
|
|
static int
|
|
|
|
salinfo_log_open(struct inode *inode, struct file *file)
|
|
|
|
{
|
2013-04-01 02:16:14 +04:00
|
|
|
struct salinfo_data *data = PDE_DATA(inode);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
spin_lock(&data_lock);
|
|
|
|
if (data->open) {
|
|
|
|
spin_unlock(&data_lock);
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
data->open = 1;
|
|
|
|
spin_unlock(&data_lock);
|
|
|
|
|
|
|
|
if (data->state == STATE_NO_DATA &&
|
|
|
|
!(data->log_buffer = vmalloc(ia64_sal_get_state_info_size(data->type)))) {
|
|
|
|
data->open = 0;
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
salinfo_log_release(struct inode *inode, struct file *file)
|
|
|
|
{
|
2013-04-01 02:16:14 +04:00
|
|
|
struct salinfo_data *data = PDE_DATA(inode);
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
if (data->state == STATE_NO_DATA) {
|
|
|
|
vfree(data->log_buffer);
|
|
|
|
vfree(data->oemdata);
|
|
|
|
data->log_buffer = NULL;
|
|
|
|
data->oemdata = NULL;
|
|
|
|
}
|
|
|
|
spin_lock(&data_lock);
|
|
|
|
data->open = 0;
|
|
|
|
spin_unlock(&data_lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-04-12 23:07:29 +03:00
|
|
|
static long
|
2005-04-17 02:20:36 +04:00
|
|
|
salinfo_log_read_cpu(void *context)
|
|
|
|
{
|
|
|
|
struct salinfo_data *data = context;
|
|
|
|
sal_log_record_header_t *rh;
|
|
|
|
data->log_size = ia64_sal_get_state_info(data->type, (u64 *) data->log_buffer);
|
|
|
|
rh = (sal_log_record_header_t *)(data->log_buffer);
|
|
|
|
/* Clear corrected errors as they are read from SAL */
|
|
|
|
if (rh->severity == sal_log_severity_corrected)
|
|
|
|
ia64_sal_clear_state_info(data->type);
|
2017-04-12 23:07:29 +03:00
|
|
|
return 0;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
salinfo_log_new_read(int cpu, struct salinfo_data *data)
|
|
|
|
{
|
|
|
|
struct salinfo_data_saved *data_saved;
|
|
|
|
unsigned long flags;
|
|
|
|
int i;
|
|
|
|
int saved_size = ARRAY_SIZE(data->data_saved);
|
|
|
|
|
|
|
|
data->saved_num = 0;
|
|
|
|
spin_lock_irqsave(&data_saved_lock, flags);
|
|
|
|
retry:
|
|
|
|
for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
|
|
|
|
if (data_saved->buffer && data_saved->cpu == cpu) {
|
|
|
|
sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
|
|
|
|
data->log_size = data_saved->size;
|
|
|
|
memcpy(data->log_buffer, rh, data->log_size);
|
|
|
|
barrier(); /* id check must not be moved */
|
|
|
|
if (rh->id == data_saved->id) {
|
|
|
|
data->saved_num = i+1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
/* saved record changed by mca.c since interrupt, discard it */
|
|
|
|
shift1_data_saved(data, i);
|
|
|
|
goto retry;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
spin_unlock_irqrestore(&data_saved_lock, flags);
|
|
|
|
|
|
|
|
if (!data->saved_num)
|
2017-04-12 23:07:29 +03:00
|
|
|
work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
|
2005-04-17 02:20:36 +04:00
|
|
|
if (!data->log_size) {
|
2006-01-06 02:36:06 +03:00
|
|
|
data->state = STATE_NO_DATA;
|
2015-03-05 03:19:16 +03:00
|
|
|
cpumask_clear_cpu(cpu, &data->cpu_event);
|
2005-04-17 02:20:36 +04:00
|
|
|
} else {
|
2006-01-06 02:36:06 +03:00
|
|
|
data->state = STATE_LOG_RECORD;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
|
|
|
salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
|
|
|
|
{
|
2013-04-01 02:16:14 +04:00
|
|
|
struct salinfo_data *data = PDE_DATA(file_inode(file));
|
2005-04-17 02:20:36 +04:00
|
|
|
u8 *buf;
|
|
|
|
u64 bufsize;
|
|
|
|
|
|
|
|
if (data->state == STATE_LOG_RECORD) {
|
|
|
|
buf = data->log_buffer;
|
|
|
|
bufsize = data->log_size;
|
|
|
|
} else if (data->state == STATE_OEMDATA) {
|
|
|
|
buf = data->oemdata;
|
|
|
|
bufsize = data->oemdata_size;
|
|
|
|
} else {
|
|
|
|
buf = NULL;
|
|
|
|
bufsize = 0;
|
|
|
|
}
|
|
|
|
return simple_read_from_buffer(buffer, count, ppos, buf, bufsize);
|
|
|
|
}
|
|
|
|
|
2017-04-12 23:07:29 +03:00
|
|
|
static long
|
2005-04-17 02:20:36 +04:00
|
|
|
salinfo_log_clear_cpu(void *context)
|
|
|
|
{
|
|
|
|
struct salinfo_data *data = context;
|
2017-04-12 23:07:29 +03:00
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
ia64_sal_clear_state_info(data->type);
|
2017-04-12 23:07:29 +03:00
|
|
|
return 0;
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
salinfo_log_clear(struct salinfo_data *data, int cpu)
|
|
|
|
{
|
|
|
|
sal_log_record_header_t *rh;
|
2006-01-06 02:36:06 +03:00
|
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&data_saved_lock, flags);
|
2005-04-17 02:20:36 +04:00
|
|
|
data->state = STATE_NO_DATA;
|
2015-03-05 03:19:16 +03:00
|
|
|
if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
|
2006-01-06 02:36:06 +03:00
|
|
|
spin_unlock_irqrestore(&data_saved_lock, flags);
|
2005-04-17 02:20:36 +04:00
|
|
|
return 0;
|
2006-01-06 02:36:06 +03:00
|
|
|
}
|
2015-03-05 03:19:16 +03:00
|
|
|
cpumask_clear_cpu(cpu, &data->cpu_event);
|
2005-04-17 02:20:36 +04:00
|
|
|
if (data->saved_num) {
|
2006-01-06 02:36:06 +03:00
|
|
|
shift1_data_saved(data, data->saved_num - 1);
|
2005-04-17 02:20:36 +04:00
|
|
|
data->saved_num = 0;
|
|
|
|
}
|
2006-01-06 02:36:06 +03:00
|
|
|
spin_unlock_irqrestore(&data_saved_lock, flags);
|
2005-04-17 02:20:36 +04:00
|
|
|
rh = (sal_log_record_header_t *)(data->log_buffer);
|
|
|
|
/* Corrected errors have already been cleared from SAL */
|
|
|
|
if (rh->severity != sal_log_severity_corrected)
|
2017-04-12 23:07:29 +03:00
|
|
|
work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
|
2005-04-17 02:20:36 +04:00
|
|
|
/* clearing a record may make a new record visible */
|
|
|
|
salinfo_log_new_read(cpu, data);
|
2006-01-06 02:36:06 +03:00
|
|
|
if (data->state == STATE_LOG_RECORD) {
|
|
|
|
spin_lock_irqsave(&data_saved_lock, flags);
|
2015-03-05 03:19:16 +03:00
|
|
|
cpumask_set_cpu(cpu, &data->cpu_event);
|
2016-07-25 11:43:13 +03:00
|
|
|
wake_up_interruptible(&data->read_wait);
|
2006-01-06 02:36:06 +03:00
|
|
|
spin_unlock_irqrestore(&data_saved_lock, flags);
|
|
|
|
}
|
2005-04-17 02:20:36 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
|
|
|
salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
|
|
|
|
{
|
2013-04-01 02:16:14 +04:00
|
|
|
struct salinfo_data *data = PDE_DATA(file_inode(file));
|
2005-04-17 02:20:36 +04:00
|
|
|
char cmd[32];
|
|
|
|
size_t size;
|
|
|
|
u32 offset;
|
|
|
|
int cpu;
|
|
|
|
|
|
|
|
size = sizeof(cmd);
|
|
|
|
if (count < size)
|
|
|
|
size = count;
|
|
|
|
if (copy_from_user(cmd, buffer, size))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
if (sscanf(cmd, "read %d", &cpu) == 1) {
|
|
|
|
salinfo_log_new_read(cpu, data);
|
|
|
|
} else if (sscanf(cmd, "clear %d", &cpu) == 1) {
|
|
|
|
int ret;
|
|
|
|
if ((ret = salinfo_log_clear(data, cpu)))
|
|
|
|
count = ret;
|
|
|
|
} else if (sscanf(cmd, "oemdata %d %d", &cpu, &offset) == 2) {
|
|
|
|
if (data->state != STATE_LOG_RECORD && data->state != STATE_OEMDATA)
|
|
|
|
return -EINVAL;
|
|
|
|
if (offset > data->log_size - sizeof(efi_guid_t))
|
|
|
|
return -EINVAL;
|
|
|
|
data->state = STATE_OEMDATA;
|
|
|
|
if (salinfo_platform_oemdata) {
|
|
|
|
struct salinfo_platform_oemdata_parms parms = {
|
|
|
|
.efi_guid = data->log_buffer + offset,
|
|
|
|
.oemdata = &data->oemdata,
|
|
|
|
.oemdata_size = &data->oemdata_size
|
|
|
|
};
|
2017-04-12 23:07:29 +03:00
|
|
|
count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
|
|
|
|
&parms);
|
2005-04-17 02:20:36 +04:00
|
|
|
} else
|
|
|
|
data->oemdata_size = 0;
|
|
|
|
} else
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
2007-02-12 11:55:31 +03:00
|
|
|
static const struct file_operations salinfo_data_fops = {
|
2005-04-17 02:20:36 +04:00
|
|
|
.open = salinfo_log_open,
|
|
|
|
.release = salinfo_log_release,
|
|
|
|
.read = salinfo_log_read,
|
|
|
|
.write = salinfo_log_write,
|
llseek: automatically add .llseek fop
All file_operations should get a .llseek operation so we can make
nonseekable_open the default for future file operations without a
.llseek pointer.
The three cases that we can automatically detect are no_llseek, seq_lseek
and default_llseek. For cases where we can we can automatically prove that
the file offset is always ignored, we use noop_llseek, which maintains
the current behavior of not returning an error from a seek.
New drivers should normally not use noop_llseek but instead use no_llseek
and call nonseekable_open at open time. Existing drivers can be converted
to do the same when the maintainer knows for certain that no user code
relies on calling seek on the device file.
The generated code is often incorrectly indented and right now contains
comments that clarify for each added line why a specific variant was
chosen. In the version that gets submitted upstream, the comments will
be gone and I will manually fix the indentation, because there does not
seem to be a way to do that using coccinelle.
Some amount of new code is currently sitting in linux-next that should get
the same modifications, which I will do at the end of the merge window.
Many thanks to Julia Lawall for helping me learn to write a semantic
patch that does all this.
===== begin semantic patch =====
// This adds an llseek= method to all file operations,
// as a preparation for making no_llseek the default.
//
// The rules are
// - use no_llseek explicitly if we do nonseekable_open
// - use seq_lseek for sequential files
// - use default_llseek if we know we access f_pos
// - use noop_llseek if we know we don't access f_pos,
// but we still want to allow users to call lseek
//
@ open1 exists @
identifier nested_open;
@@
nested_open(...)
{
<+...
nonseekable_open(...)
...+>
}
@ open exists@
identifier open_f;
identifier i, f;
identifier open1.nested_open;
@@
int open_f(struct inode *i, struct file *f)
{
<+...
(
nonseekable_open(...)
|
nested_open(...)
)
...+>
}
@ read disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ read_no_fpos disable optional_qualifier exists @
identifier read_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off)
{
... when != off
}
@ write @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
expression E;
identifier func;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
<+...
(
*off = E
|
*off += E
|
func(..., off, ...)
|
E = *off
)
...+>
}
@ write_no_fpos @
identifier write_f;
identifier f, p, s, off;
type ssize_t, size_t, loff_t;
@@
ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off)
{
... when != off
}
@ fops0 @
identifier fops;
@@
struct file_operations fops = {
...
};
@ has_llseek depends on fops0 @
identifier fops0.fops;
identifier llseek_f;
@@
struct file_operations fops = {
...
.llseek = llseek_f,
...
};
@ has_read depends on fops0 @
identifier fops0.fops;
identifier read_f;
@@
struct file_operations fops = {
...
.read = read_f,
...
};
@ has_write depends on fops0 @
identifier fops0.fops;
identifier write_f;
@@
struct file_operations fops = {
...
.write = write_f,
...
};
@ has_open depends on fops0 @
identifier fops0.fops;
identifier open_f;
@@
struct file_operations fops = {
...
.open = open_f,
...
};
// use no_llseek if we call nonseekable_open
////////////////////////////////////////////
@ nonseekable1 depends on !has_llseek && has_open @
identifier fops0.fops;
identifier nso ~= "nonseekable_open";
@@
struct file_operations fops = {
... .open = nso, ...
+.llseek = no_llseek, /* nonseekable */
};
@ nonseekable2 depends on !has_llseek @
identifier fops0.fops;
identifier open.open_f;
@@
struct file_operations fops = {
... .open = open_f, ...
+.llseek = no_llseek, /* open uses nonseekable */
};
// use seq_lseek for sequential files
/////////////////////////////////////
@ seq depends on !has_llseek @
identifier fops0.fops;
identifier sr ~= "seq_read";
@@
struct file_operations fops = {
... .read = sr, ...
+.llseek = seq_lseek, /* we have seq_read */
};
// use default_llseek if there is a readdir
///////////////////////////////////////////
@ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier readdir_e;
@@
// any other fop is used that changes pos
struct file_operations fops = {
... .readdir = readdir_e, ...
+.llseek = default_llseek, /* readdir is present */
};
// use default_llseek if at least one of read/write touches f_pos
/////////////////////////////////////////////////////////////////
@ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read.read_f;
@@
// read fops use offset
struct file_operations fops = {
... .read = read_f, ...
+.llseek = default_llseek, /* read accesses f_pos */
};
@ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write.write_f;
@@
// write fops use offset
struct file_operations fops = {
... .write = write_f, ...
+ .llseek = default_llseek, /* write accesses f_pos */
};
// Use noop_llseek if neither read nor write accesses f_pos
///////////////////////////////////////////////////////////
@ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
identifier write_no_fpos.write_f;
@@
// write fops use offset
struct file_operations fops = {
...
.write = write_f,
.read = read_f,
...
+.llseek = noop_llseek, /* read and write both use no f_pos */
};
@ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier write_no_fpos.write_f;
@@
struct file_operations fops = {
... .write = write_f, ...
+.llseek = noop_llseek, /* write uses no f_pos */
};
@ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
identifier read_no_fpos.read_f;
@@
struct file_operations fops = {
... .read = read_f, ...
+.llseek = noop_llseek, /* read uses no f_pos */
};
@ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @
identifier fops0.fops;
@@
struct file_operations fops = {
...
+.llseek = noop_llseek, /* no read or write fn */
};
===== End semantic patch =====
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Julia Lawall <julia@diku.dk>
Cc: Christoph Hellwig <hch@infradead.org>
2010-08-15 20:52:59 +04:00
|
|
|
.llseek = default_llseek,
|
2005-04-17 02:20:36 +04:00
|
|
|
};
|
|
|
|
|
2016-11-03 20:31:29 +03:00
|
|
|
static int salinfo_cpu_online(unsigned int cpu)
|
2006-01-06 02:36:06 +03:00
|
|
|
{
|
2016-11-03 20:31:29 +03:00
|
|
|
unsigned int i, end = ARRAY_SIZE(salinfo_data);
|
2006-01-06 02:36:06 +03:00
|
|
|
struct salinfo_data *data;
|
2016-11-03 20:31:29 +03:00
|
|
|
|
|
|
|
spin_lock_irq(&data_saved_lock);
|
|
|
|
for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
|
|
|
|
cpumask_set_cpu(cpu, &data->cpu_event);
|
|
|
|
wake_up_interruptible(&data->read_wait);
|
2006-01-06 02:36:06 +03:00
|
|
|
}
|
2016-11-03 20:31:29 +03:00
|
|
|
spin_unlock_irq(&data_saved_lock);
|
|
|
|
return 0;
|
2006-01-06 02:36:06 +03:00
|
|
|
}
|
|
|
|
|
2016-11-03 20:31:29 +03:00
|
|
|
static int salinfo_cpu_pre_down(unsigned int cpu)
|
2006-01-06 02:36:06 +03:00
|
|
|
{
|
2016-11-03 20:31:29 +03:00
|
|
|
unsigned int i, end = ARRAY_SIZE(salinfo_data);
|
|
|
|
struct salinfo_data *data;
|
|
|
|
|
|
|
|
spin_lock_irq(&data_saved_lock);
|
|
|
|
for (i = 0, data = salinfo_data; i < end; ++i, ++data) {
|
|
|
|
struct salinfo_data_saved *data_saved;
|
|
|
|
int j = ARRAY_SIZE(data->data_saved) - 1;
|
|
|
|
|
|
|
|
for (data_saved = data->data_saved + j; j >= 0;
|
|
|
|
--j, --data_saved) {
|
|
|
|
if (data_saved->buffer && data_saved->cpu == cpu)
|
|
|
|
shift1_data_saved(data, j);
|
|
|
|
}
|
|
|
|
cpumask_clear_cpu(cpu, &data->cpu_event);
|
|
|
|
}
|
|
|
|
spin_unlock_irq(&data_saved_lock);
|
|
|
|
return 0;
|
|
|
|
}
|
2006-01-06 02:36:06 +03:00
|
|
|
|
2018-05-15 16:57:23 +03:00
|
|
|
/*
|
|
|
|
* 'data' contains an integer that corresponds to the feature we're
|
|
|
|
* testing
|
|
|
|
*/
|
|
|
|
static int proc_salinfo_show(struct seq_file *m, void *v)
|
|
|
|
{
|
|
|
|
unsigned long data = (unsigned long)v;
|
|
|
|
seq_puts(m, (sal_platform_features & data) ? "1\n" : "0\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2005-04-17 02:20:36 +04:00
|
|
|
static int __init
|
|
|
|
salinfo_init(void)
|
|
|
|
{
|
|
|
|
struct proc_dir_entry *salinfo_dir; /* /proc/sal dir entry */
|
|
|
|
struct proc_dir_entry **sdir = salinfo_proc_entries; /* keeps track of every entry */
|
|
|
|
struct proc_dir_entry *dir, *entry;
|
|
|
|
struct salinfo_data *data;
|
2016-11-03 20:31:29 +03:00
|
|
|
int i;
|
2005-04-17 02:20:36 +04:00
|
|
|
|
|
|
|
salinfo_dir = proc_mkdir("sal", NULL);
|
|
|
|
if (!salinfo_dir)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
for (i=0; i < NR_SALINFO_ENTRIES; i++) {
|
|
|
|
/* pass the feature bit in question as misc data */
|
2018-05-15 16:57:23 +03:00
|
|
|
*sdir++ = proc_create_single_data(salinfo_entries[i].name, 0,
|
|
|
|
salinfo_dir, proc_salinfo_show,
|
|
|
|
(void *)salinfo_entries[i].feature);
|
2005-04-17 02:20:36 +04:00
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
|
|
|
|
data = salinfo_data + i;
|
|
|
|
data->type = i;
|
2016-07-25 11:43:13 +03:00
|
|
|
init_waitqueue_head(&data->read_wait);
|
2005-04-17 02:20:36 +04:00
|
|
|
dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
|
|
|
|
if (!dir)
|
|
|
|
continue;
|
|
|
|
|
2008-04-29 12:02:25 +04:00
|
|
|
entry = proc_create_data("event", S_IRUSR, dir,
|
|
|
|
&salinfo_event_fops, data);
|
2005-04-17 02:20:36 +04:00
|
|
|
if (!entry)
|
|
|
|
continue;
|
|
|
|
*sdir++ = entry;
|
|
|
|
|
2008-04-29 12:02:25 +04:00
|
|
|
entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
|
|
|
|
&salinfo_data_fops, data);
|
2005-04-17 02:20:36 +04:00
|
|
|
if (!entry)
|
|
|
|
continue;
|
|
|
|
*sdir++ = entry;
|
|
|
|
|
|
|
|
*sdir++ = dir;
|
|
|
|
}
|
|
|
|
|
|
|
|
*sdir++ = salinfo_dir;
|
|
|
|
|
2017-10-20 00:24:01 +03:00
|
|
|
timer_setup(&salinfo_timer, salinfo_timeout, 0);
|
2005-04-17 02:20:36 +04:00
|
|
|
salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
|
|
|
|
add_timer(&salinfo_timer);
|
|
|
|
|
2016-11-03 20:31:29 +03:00
|
|
|
i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
|
|
|
|
salinfo_cpu_online, salinfo_cpu_pre_down);
|
|
|
|
WARN_ON(i < 0);
|
2005-04-17 02:20:36 +04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(salinfo_init);
|