Adding upstream version 6.7.7.upstream/6.7.7

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 646 deletions

diff --git a/arch/ia64/kernel/salinfo.c b/arch/ia64/kernel/salinfo.c
deleted file mode 100644
index 03b632c568..0000000000
--- a/arch/ia64/kernel/salinfo.c
+++ /dev/null
@@ -1,646 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * salinfo.c
- *
- * Creates entries in /proc/sal for various system features.
- *
- * Copyright (c) 2003, 2006 Silicon Graphics, Inc.  All rights reserved.
- * Copyright (c) 2003 Hewlett-Packard Co
- *	Bjorn Helgaas <bjorn.helgaas@hp.com>
- *
- * 10/30/2001	jbarnes@sgi.com		copied much of Stephane's palinfo
- *					code to create this file
- * Oct 23 2003	kaos@sgi.com
- *   Replace IPI with set_cpus_allowed() to read a record from the required cpu.
- *   Redesign salinfo log processing to separate interrupt and user space
- *   contexts.
- *   Cache the record across multi-block reads from user space.
- *   Support > 64 cpus.
- *   Delete module_exit and MOD_INC/DEC_COUNT, salinfo cannot be a module.
- *
- * Jan 28 2004	kaos@sgi.com
- *   Periodically check for outstanding MCA or INIT records.
- *
- * Dec  5 2004	kaos@sgi.com
- *   Standardize which records are cleared automatically.
- *
- * Aug 18 2005	kaos@sgi.com
- *   mca.c may not pass a buffer, a NULL buffer just indicates that a new
- *   record is available in SAL.
- *   Replace some NR_CPUS by cpus_online, for hotplug cpu.
- *
- * Jan  5 2006        kaos@sgi.com
- *   Handle hotplug cpus coming online.
- *   Handle hotplug cpus going offline while they still have outstanding records.
- *   Use the cpu_* macros consistently.
- *   Replace the counting semaphore with a mutex and a test if the cpumask is non-empty.
- *   Modify the locking to make the test for "work to do" an atomic operation.
- */
-
-#include <linux/capability.h>
-#include <linux/cpu.h>
-#include <linux/types.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <linux/module.h>
-#include <linux/smp.h>
-#include <linux/timer.h>
-#include <linux/vmalloc.h>
-#include <linux/semaphore.h>
-
-#include <asm/sal.h>
-#include <linux/uaccess.h>
-
-MODULE_AUTHOR("Jesse Barnes <jbarnes@sgi.com>");
-MODULE_DESCRIPTION("/proc interface to IA-64 SAL features");
-MODULE_LICENSE("GPL");
-
-typedef struct {
-	const char		*name;		/* name of the proc entry */
-	unsigned long           feature;        /* feature bit */
-	struct proc_dir_entry	*entry;		/* registered entry (removal) */
-} salinfo_entry_t;
-
-/*
- * List {name,feature} pairs for every entry in /proc/sal/<feature>
- * that this module exports
- */
-static const salinfo_entry_t salinfo_entries[]={
-	{ "bus_lock",           IA64_SAL_PLATFORM_FEATURE_BUS_LOCK, },
-	{ "irq_redirection",	IA64_SAL_PLATFORM_FEATURE_IRQ_REDIR_HINT, },
-	{ "ipi_redirection",	IA64_SAL_PLATFORM_FEATURE_IPI_REDIR_HINT, },
-	{ "itc_drift",		IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT, },
-};
-
-#define NR_SALINFO_ENTRIES ARRAY_SIZE(salinfo_entries)
-
-static char *salinfo_log_name[] = {
-	"mca",
-	"init",
-	"cmc",
-	"cpe",
-};
-
-static struct proc_dir_entry *salinfo_proc_entries[
-	ARRAY_SIZE(salinfo_entries) +			/* /proc/sal/bus_lock */
-	ARRAY_SIZE(salinfo_log_name) +			/* /proc/sal/{mca,...} */
-	(2 * ARRAY_SIZE(salinfo_log_name)) +		/* /proc/sal/mca/{event,data} */
-	1];						/* /proc/sal */
-
-/* Some records we get ourselves, some are accessed as saved data in buffers
- * that are owned by mca.c.
- */
-struct salinfo_data_saved {
-	u8*			buffer;
-	u64			size;
-	u64			id;
-	int			cpu;
-};
-
-/* State transitions.  Actions are :-
- *   Write "read <cpunum>" to the data file.
- *   Write "clear <cpunum>" to the data file.
- *   Write "oemdata <cpunum> <offset> to the data file.
- *   Read from the data file.
- *   Close the data file.
- *
- * Start state is NO_DATA.
- *
- * NO_DATA
- *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "oemdata <cpunum> <offset> -> return -EINVAL.
- *    read data -> return EOF.
- *    close -> unchanged.  Free record areas.
- *
- * LOG_RECORD
- *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
- *    read data -> return the INIT/MCA/CMC/CPE record.
- *    close -> unchanged.  Keep record areas.
- *
- * OEMDATA
- *    write "read <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "clear <cpunum>" -> NO_DATA or LOG_RECORD.
- *    write "oemdata <cpunum> <offset> -> format the oem data, goto OEMDATA.
- *    read data -> return the formatted oemdata.
- *    close -> unchanged.  Keep record areas.
- *
- * Closing the data file does not change the state.  This allows shell scripts
- * to manipulate salinfo data, each shell redirection opens the file, does one
- * action then closes it again.  The record areas are only freed at close when
- * the state is NO_DATA.
- */
-enum salinfo_state {
-	STATE_NO_DATA,
-	STATE_LOG_RECORD,
-	STATE_OEMDATA,
-};
-
-struct salinfo_data {
-	cpumask_t		cpu_event;	/* which cpus have outstanding events */
-	wait_queue_head_t	read_wait;
-	u8			*log_buffer;
-	u64			log_size;
-	u8			*oemdata;	/* decoded oem data */
-	u64			oemdata_size;
-	int			open;		/* single-open to prevent races */
-	u8			type;
-	u8			saved_num;	/* using a saved record? */
-	enum salinfo_state	state :8;	/* processing state */
-	u8			padding;
-	int			cpu_check;	/* next CPU to check */
-	struct salinfo_data_saved data_saved[5];/* save last 5 records from mca.c, must be < 255 */
-};
-
-static struct salinfo_data salinfo_data[ARRAY_SIZE(salinfo_log_name)];
-
-static DEFINE_SPINLOCK(data_lock);
-static DEFINE_SPINLOCK(data_saved_lock);
-
-/** salinfo_platform_oemdata - optional callback to decode oemdata from an error
- * record.
- * @sect_header: pointer to the start of the section to decode.
- * @oemdata: returns vmalloc area containing the decoded output.
- * @oemdata_size: returns length of decoded output (strlen).
- *
- * Description: If user space asks for oem data to be decoded by the kernel
- * and/or prom and the platform has set salinfo_platform_oemdata to the address
- * of a platform specific routine then call that routine.  salinfo_platform_oemdata
- * vmalloc's and formats its output area, returning the address of the text
- * and its strlen.  Returns 0 for success, -ve for error.  The callback is
- * invoked on the cpu that generated the error record.
- */
-int (*salinfo_platform_oemdata)(const u8 *sect_header, u8 **oemdata, u64 *oemdata_size);
-
-struct salinfo_platform_oemdata_parms {
-	const u8 *efi_guid;
-	u8 **oemdata;
-	u64 *oemdata_size;
-};
-
-static long
-salinfo_platform_oemdata_cpu(void *context)
-{
-	struct salinfo_platform_oemdata_parms *parms = context;
-
-	return salinfo_platform_oemdata(parms->efi_guid, parms->oemdata, parms->oemdata_size);
-}
-
-static void
-shift1_data_saved (struct salinfo_data *data, int shift)
-{
-	memcpy(data->data_saved+shift, data->data_saved+shift+1,
-	       (ARRAY_SIZE(data->data_saved) - (shift+1)) * sizeof(data->data_saved[0]));
-	memset(data->data_saved + ARRAY_SIZE(data->data_saved) - 1, 0,
-	       sizeof(data->data_saved[0]));
-}
-
-/* This routine is invoked in interrupt context.  Note: mca.c enables
- * interrupts before calling this code for CMC/CPE.  MCA and INIT events are
- * not irq safe, do not call any routines that use spinlocks, they may deadlock.
- * MCA and INIT records are recorded, a timer event will look for any
- * outstanding events and wake up the user space code.
- *
- * The buffer passed from mca.c points to the output from ia64_log_get. This is
- * a persistent buffer but its contents can change between the interrupt and
- * when user space processes the record.  Save the record id to identify
- * changes.  If the buffer is NULL then just update the bitmap.
- */
-void
-salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
-{
-	struct salinfo_data *data = salinfo_data + type;
-	struct salinfo_data_saved *data_saved;
-	unsigned long flags = 0;
-	int i;
-	int saved_size = ARRAY_SIZE(data->data_saved);
-
-	BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
-
-	if (irqsafe)
-		spin_lock_irqsave(&data_saved_lock, flags);
-	if (buffer) {
-		for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
-			if (!data_saved->buffer)
-				break;
-		}
-		if (i == saved_size) {
-			if (!data->saved_num) {
-				shift1_data_saved(data, 0);
-				data_saved = data->data_saved + saved_size - 1;
-			} else
-				data_saved = NULL;
-		}
-		if (data_saved) {
-			data_saved->cpu = smp_processor_id();
-			data_saved->id = ((sal_log_record_header_t *)buffer)->id;
-			data_saved->size = size;
-			data_saved->buffer = buffer;
-		}
-	}
-	cpumask_set_cpu(smp_processor_id(), &data->cpu_event);
-	if (irqsafe) {
-		wake_up_interruptible(&data->read_wait);
-		spin_unlock_irqrestore(&data_saved_lock, flags);
-	}
-}
-
-/* Check for outstanding MCA/INIT records every minute (arbitrary) */
-#define SALINFO_TIMER_DELAY (60*HZ)
-static struct timer_list salinfo_timer;
-extern void ia64_mlogbuf_dump(void);
-
-static void
-salinfo_timeout_check(struct salinfo_data *data)
-{
-	if (!data->open)
-		return;
-	if (!cpumask_empty(&data->cpu_event))
-		wake_up_interruptible(&data->read_wait);
-}
-
-static void
-salinfo_timeout(struct timer_list *unused)
-{
-	ia64_mlogbuf_dump();
-	salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_MCA);
-	salinfo_timeout_check(salinfo_data + SAL_INFO_TYPE_INIT);
-	salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
-	add_timer(&salinfo_timer);
-}
-
-static int
-salinfo_event_open(struct inode *inode, struct file *file)
-{
-	if (!capable(CAP_SYS_ADMIN))
-		return -EPERM;
-	return 0;
-}
-
-static ssize_t
-salinfo_event_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
-	struct salinfo_data *data = pde_data(file_inode(file));
-	char cmd[32];
-	size_t size;
-	int i, n, cpu = -1;
-
-retry:
-	if (cpumask_empty(&data->cpu_event)) {
-		if (file->f_flags & O_NONBLOCK)
-			return -EAGAIN;
-		if (wait_event_interruptible(data->read_wait,
-					     !cpumask_empty(&data->cpu_event)))
-			return -EINTR;
-	}
-
-	n = data->cpu_check;
-	for (i = 0; i < nr_cpu_ids; i++) {
-		if (cpumask_test_cpu(n, &data->cpu_event)) {
-			if (!cpu_online(n)) {
-				cpumask_clear_cpu(n, &data->cpu_event);
-				continue;
-			}
-			cpu = n;
-			break;
-		}
-		if (++n == nr_cpu_ids)
-			n = 0;
-	}
-
-	if (cpu == -1)
-		goto retry;
-
-	ia64_mlogbuf_dump();
-
-	/* for next read, start checking at next CPU */
-	data->cpu_check = cpu;
-	if (++data->cpu_check == nr_cpu_ids)
-		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;
-}
-
-static const struct proc_ops salinfo_event_proc_ops = {
-	.proc_open	= salinfo_event_open,
-	.proc_read	= salinfo_event_read,
-	.proc_lseek	= noop_llseek,
-};
-
-static int
-salinfo_log_open(struct inode *inode, struct file *file)
-{
-	struct salinfo_data *data = pde_data(inode);
-
-	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)
-{
-	struct salinfo_data *data = pde_data(inode);
-
-	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;
-}
-
-static long
-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);
-	return 0;
-}
-
-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)
-		work_on_cpu_safe(cpu, salinfo_log_read_cpu, data);
-	if (!data->log_size) {
-		data->state = STATE_NO_DATA;
-		cpumask_clear_cpu(cpu, &data->cpu_event);
-	} else {
-		data->state = STATE_LOG_RECORD;
-	}
-}
-
-static ssize_t
-salinfo_log_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
-{
-	struct salinfo_data *data = pde_data(file_inode(file));
-	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);
-}
-
-static long
-salinfo_log_clear_cpu(void *context)
-{
-	struct salinfo_data *data = context;
-
-	ia64_sal_clear_state_info(data->type);
-	return 0;
-}
-
-static int
-salinfo_log_clear(struct salinfo_data *data, int cpu)
-{
-	sal_log_record_header_t *rh;
-	unsigned long flags;
-	spin_lock_irqsave(&data_saved_lock, flags);
-	data->state = STATE_NO_DATA;
-	if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
-		spin_unlock_irqrestore(&data_saved_lock, flags);
-		return 0;
-	}
-	cpumask_clear_cpu(cpu, &data->cpu_event);
-	if (data->saved_num) {
-		shift1_data_saved(data, data->saved_num - 1);
-		data->saved_num = 0;
-	}
-	spin_unlock_irqrestore(&data_saved_lock, flags);
-	rh = (sal_log_record_header_t *)(data->log_buffer);
-	/* Corrected errors have already been cleared from SAL */
-	if (rh->severity != sal_log_severity_corrected)
-		work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
-	/* clearing a record may make a new record visible */
-	salinfo_log_new_read(cpu, data);
-	if (data->state == STATE_LOG_RECORD) {
-		spin_lock_irqsave(&data_saved_lock, flags);
-		cpumask_set_cpu(cpu, &data->cpu_event);
-		wake_up_interruptible(&data->read_wait);
-		spin_unlock_irqrestore(&data_saved_lock, flags);
-	}
-	return 0;
-}
-
-static ssize_t
-salinfo_log_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
-{
-	struct salinfo_data *data = pde_data(file_inode(file));
-	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
-			};
-			count = work_on_cpu_safe(cpu, salinfo_platform_oemdata_cpu,
-						 &parms);
-		} else
-			data->oemdata_size = 0;
-	} else
-		return -EINVAL;
-
-	return count;
-}
-
-static const struct proc_ops salinfo_data_proc_ops = {
-	.proc_open	= salinfo_log_open,
-	.proc_release	= salinfo_log_release,
-	.proc_read	= salinfo_log_read,
-	.proc_write	= salinfo_log_write,
-	.proc_lseek	= default_llseek,
-};
-
-static int salinfo_cpu_online(unsigned int cpu)
-{
-	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) {
-		cpumask_set_cpu(cpu, &data->cpu_event);
-		wake_up_interruptible(&data->read_wait);
-	}
-	spin_unlock_irq(&data_saved_lock);
-	return 0;
-}
-
-static int salinfo_cpu_pre_down(unsigned int cpu)
-{
-	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;
-}
-
-/*
- * 'data' contains an integer that corresponds to the feature we're
- * testing
- */
-static int __maybe_unused 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;
-}
-
-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;
-	int i;
-
-	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 */
-		*sdir++ = proc_create_single_data(salinfo_entries[i].name, 0,
-				salinfo_dir, proc_salinfo_show,
-				(void *)salinfo_entries[i].feature);
-	}
-
-	for (i = 0; i < ARRAY_SIZE(salinfo_log_name); i++) {
-		data = salinfo_data + i;
-		data->type = i;
-		init_waitqueue_head(&data->read_wait);
-		dir = proc_mkdir(salinfo_log_name[i], salinfo_dir);
-		if (!dir)
-			continue;
-
-		entry = proc_create_data("event", S_IRUSR, dir,
-					 &salinfo_event_proc_ops, data);
-		if (!entry)
-			continue;
-		*sdir++ = entry;
-
-		entry = proc_create_data("data", S_IRUSR | S_IWUSR, dir,
-					 &salinfo_data_proc_ops, data);
-		if (!entry)
-			continue;
-		*sdir++ = entry;
-
-		*sdir++ = dir;
-	}
-
-	*sdir++ = salinfo_dir;
-
-	timer_setup(&salinfo_timer, salinfo_timeout, 0);
-	salinfo_timer.expires = jiffies + SALINFO_TIMER_DELAY;
-	add_timer(&salinfo_timer);
-
-	i = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "ia64/salinfo:online",
-			      salinfo_cpu_online, salinfo_cpu_pre_down);
-	WARN_ON(i < 0);
-	return 0;
-}
-
-module_init(salinfo_init);