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Commit 855647c4 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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[PATCH] efivars: remove from arch/ia64 

From: Matt Tolentino <metolent@snoqualmie.dp.intel.com>

I broke up the efivars driver update patch I had sent out quite a while ago
into several smaller patches.  This includes several fixes and suggestions
that were pointed out.  The patches are broken down as follows:

1 - remove all traces of efivars from arch/ia64/
2 - add new sysfs based efivars driver into
    drivers/firmware with accompanying Kconfig/Makefile
    changes to make it fully functional for ia64 again.
3 - cleans up x86 references to the /proc version of
    the efivars driver.
parent b13496e8
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Showing with 1 addition and 581 deletions
arch/ia64/Kconfig
View file @ 855647c4
......@@ -294,16 +294,6 @@ config IA64_PALINFO
To use this option, you have to ensure that the "/proc file system
support" (CONFIG_PROC_FS) is enabled, too.
config EFI_VARS
tristate "/proc/efi/vars support"
help
If you say Y here, you are able to get EFI (Extensible Firmware
Interface) variable information in /proc/efi/vars. You may read,
write, create, and destroy EFI variables through this interface.
To use this option, you have to check that the "/proc file system
support" (CONFIG_PROC_FS) is enabled, too.
source "fs/Kconfig.binfmt"
endmenu
......
arch/ia64/kernel/Makefile
View file @ 855647c4
......@@ -8,7 +8,6 @@ obj-y := acpi.o entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o i
irq_lsapic.o ivt.o machvec.o pal.o patch.o process.o perfmon.o ptrace.o sal.o \
salinfo.o semaphore.o setup.o signal.o sys_ia64.o time.o traps.o unaligned.o unwind.o mca.o mca_asm.o
obj-$(CONFIG_EFI_VARS) += efivars.o
obj-$(CONFIG_IA64_BRL_EMU) += brl_emu.o
obj-$(CONFIG_IA64_GENERIC) += acpi-ext.o
obj-$(CONFIG_IA64_HP_ZX1) += acpi-ext.o
......
arch/ia64/kernel/efi.c
View file @ 855647c4
......@@ -24,7 +24,6 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/efi.h>
#include <asm/io.h>
......@@ -40,19 +39,6 @@ extern efi_status_t efi_call_phys (void *, ...);
struct efi efi;
EXPORT_SYMBOL(efi);
static efi_runtime_services_t *runtime;
/*
* efi_dir is allocated here, but the directory isn't created
* here, as proc_mkdir() doesn't work this early in the bootup
* process. Therefore, each module, like efivars, must test for
* if (!efi_dir) efi_dir = proc_mkdir("efi", NULL);
* prior to creating their own entries under /proc/efi.
*/
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *efi_dir;
EXPORT_SYMBOL(efi_dir);
#endif
static unsigned long mem_limit = ~0UL;
#define efi_call_virt(f, args...) (*(f))(args)
......@@ -747,10 +733,3 @@ valid_phys_addr_range (unsigned long phys_addr, unsigned long *size)
return 0;
}
static void __exit
efivars_exit (void)
{
#ifdef CONFIG_PROC_FS
remove_proc_entry(efi_dir->name, NULL);
#endif
}
arch/ia64/kernel/efivars.c deleted 100644 → 0
View file @ b13496e8
/*
* EFI Variables - efivars.c
*
* Copyright (C) 2001 Dell Computer Corporation <Matt_Domsch@dell.com>
*
* This code takes all variables accessible from EFI runtime and
* exports them via /proc
*
* Reads to /proc/efi/vars/varname return an efi_variable_t structure.
* Writes to /proc/efi/vars/varname must be an efi_variable_t structure.
* Writes with DataSize = 0 or Attributes = 0 deletes the variable.
* Writes with a new value in VariableName+VendorGuid creates
* a new variable.
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Changelog:
*
* 10 Feb 2004 - Stephane Eranian <eranian@hpl.hp.com>
* Provide FPSWA version number via /proc/efi/fpswa
*
* 10 Dec 2002 - Matt Domsch <Matt_Domsch@dell.com>
* fix locking per Peter Chubb's findings
*
* 25 Mar 2002 - Matt Domsch <Matt_Domsch@dell.com>
* move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse()
*
* 12 Feb 2002 - Matt Domsch <Matt_Domsch@dell.com>
* use list_for_each_safe when deleting vars.
* remove ifdef CONFIG_SMP around include <linux/smp.h>
* v0.04 release to linux-ia64@linuxia64.org
*
* 20 April 2001 - Matt Domsch <Matt_Domsch@dell.com>
* Moved vars from /proc/efi to /proc/efi/vars, and made
* efi.c own the /proc/efi directory.
* v0.03 release to linux-ia64@linuxia64.org
*
* 26 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
* At the request of Stephane, moved ownership of /proc/efi
* to efi.c, and now efivars lives under /proc/efi/vars.
*
* 12 March 2001 - Matt Domsch <Matt_Domsch@dell.com>
* Feedback received from Stephane Eranian incorporated.
* efivar_write() checks copy_from_user() return value.
* efivar_read/write() returns proper errno.
* v0.02 release to linux-ia64@linuxia64.org
*
* 26 February 2001 - Matt Domsch <Matt_Domsch@dell.com>
* v0.01 release to linux-ia64@linuxia64.org
*/
#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/sched.h> /* for capable() */
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/efi.h>
#include <asm/fpswa.h>
#include <asm/uaccess.h>
MODULE_AUTHOR("Matt Domsch <Matt_Domsch@Dell.com>");
MODULE_DESCRIPTION("/proc interface to EFI Variables");
MODULE_LICENSE("GPL");
#define EFIVARS_VERSION "0.06 2002-Dec-10"
static int
efivar_read(char *page, char **start, off_t off,
int count, int *eof, void *data);
static int
efivar_write(struct file *file, const char *buffer,
unsigned long count, void *data);
/*
* The maximum size of VariableName + Data = 1024
* Therefore, it's reasonable to save that much
* space in each part of the structure,
* and we use a page for reading/writing.
*/
typedef struct _efi_variable_t {
efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
efi_guid_t VendorGuid;
unsigned long DataSize;
__u8 Data[1024];
efi_status_t Status;
__u32 Attributes;
} __attribute__((packed)) efi_variable_t;
typedef struct _efivar_entry_t {
efi_variable_t var;
struct proc_dir_entry *entry;
struct list_head list;
} efivar_entry_t;
/*
efivars_lock protects two things:
1) efivar_list - adds, removals, reads, writes
2) efi.[gs]et_variable() calls.
It must not be held when creating proc entries or calling kmalloc.
efi.get_next_variable() is only called from efivars_init(),
which is protected by the BKL, so that path is safe.
*/
static spinlock_t efivars_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(efivar_list);
static struct proc_dir_entry *efi_vars_dir;
#define efivar_entry(n) list_entry(n, efivar_entry_t, list)
/* Return the number of unicode characters in data */
static unsigned long
utf8_strlen(efi_char16_t *data, unsigned long maxlength)
{
unsigned long length = 0;
while (*data++ != 0 && length < maxlength)
length++;
return length;
}
/* Return the number of bytes is the length of this string */
/* Note: this is NOT the same as the number of unicode characters */
static inline unsigned long
utf8_strsize(efi_char16_t *data, unsigned long maxlength)
{
return utf8_strlen(data, maxlength/sizeof(efi_char16_t)) * sizeof(efi_char16_t);
}
static int
proc_calc_metrics(char *page, char **start, off_t off,
int count, int *eof, int len)
{
if (len <= off+count) *eof = 1;
*start = page + off;
len -= off;
if (len>count) len = count;
if (len<0) len = 0;
return len;
}
/*
* efivar_create_proc_entry()
* Requires:
* variable_name_size = number of bytes required to hold
* variable_name (not counting the NULL
* character at the end.
* efivars_lock is not held on entry or exit.
* Returns 1 on failure, 0 on success
*/
static int
efivar_create_proc_entry(unsigned long variable_name_size,
efi_char16_t *variable_name,
efi_guid_t *vendor_guid)
{
int i, short_name_size = variable_name_size / sizeof(efi_char16_t) + 38;
char *short_name;
efivar_entry_t *new_efivar;
short_name = kmalloc(short_name_size+1, GFP_KERNEL);
new_efivar = kmalloc(sizeof(efivar_entry_t), GFP_KERNEL);
if (!short_name || !new_efivar) {
if (short_name) kfree(short_name);
if (new_efivar) kfree(new_efivar);
return 1;
}
memset(short_name, 0, short_name_size+1);
memset(new_efivar, 0, sizeof(efivar_entry_t));
memcpy(new_efivar->var.VariableName, variable_name,
variable_name_size);
memcpy(&(new_efivar->var.VendorGuid), vendor_guid, sizeof(efi_guid_t));
/* Convert Unicode to normal chars (assume top bits are 0),
ala UTF-8 */
for (i=0; i< (int) (variable_name_size / sizeof(efi_char16_t)); i++) {
short_name[i] = variable_name[i] & 0xFF;
}
/* This is ugly, but necessary to separate one vendor's
private variables from another's. */
*(short_name + strlen(short_name)) = '-';
efi_guid_unparse(vendor_guid, short_name + strlen(short_name));
/* Create the entry in proc */
new_efivar->entry = create_proc_entry(short_name, 0600, efi_vars_dir);
kfree(short_name); short_name = NULL;
if (!new_efivar->entry) return 1;
new_efivar->entry->owner = THIS_MODULE;
new_efivar->entry->data = new_efivar;
new_efivar->entry->read_proc = efivar_read;
new_efivar->entry->write_proc = efivar_write;
spin_lock(&efivars_lock);
list_add(&new_efivar->list, &efivar_list);
spin_unlock(&efivars_lock);
return 0;
}
/***********************************************************
* efivar_read()
* Requires:
* Modifies: page
* Returns: number of bytes written, or -EINVAL on failure
***********************************************************/
static int
efivar_read(char *page, char **start, off_t off, int count, int *eof, void *data)
{
int len = sizeof(efi_variable_t);
efivar_entry_t *efi_var = data;
efi_variable_t *var_data = (efi_variable_t *)page;
if (!page || !data) return -EINVAL;
spin_lock(&efivars_lock);
memcpy(var_data, &efi_var->var, len);
var_data->DataSize = 1024;
var_data->Status = efi.get_variable(var_data->VariableName,
&var_data->VendorGuid,
&var_data->Attributes,
&var_data->DataSize,
var_data->Data);
spin_unlock(&efivars_lock);
return proc_calc_metrics(page, start, off, count, eof, len);
}
/***********************************************************
* efivar_write()
* Requires: data is an efi_setvariable_t data type,
* properly filled in, possibly by a call
* first to efivar_read().
* Caller must have CAP_SYS_ADMIN
* Modifies: NVRAM
* Returns: var_data->DataSize on success, errno on failure
*
***********************************************************/
static int
efivar_write(struct file *file, const char *buffer,
unsigned long count, void *data)
{
unsigned long strsize1, strsize2;
int found=0;
struct list_head *pos, *n;
unsigned long size = sizeof(efi_variable_t);
efi_status_t status;
efivar_entry_t *efivar = data, *search_efivar = NULL;
efi_variable_t *var_data;
if (!data || count != size) {
printk(KERN_WARNING "efivars: improper struct of size 0x%lx passed.\n", count);
return -EINVAL;
}
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
var_data = kmalloc(size, GFP_KERNEL);
if (!var_data)
return -ENOMEM;
if (copy_from_user(var_data, buffer, size)) {
kfree(var_data);
return -EFAULT;
}
spin_lock(&efivars_lock);
/* Since the data ptr we've currently got is probably for
a different variable find the right variable.
This allows any properly formatted data structure to
be written to any of the files in /proc/efi/vars and it will work.
*/
list_for_each_safe(pos, n, &efivar_list) {
search_efivar = efivar_entry(pos);
strsize1 = utf8_strsize(search_efivar->var.VariableName, 1024);
strsize2 = utf8_strsize(var_data->VariableName, 1024);
if ( strsize1 == strsize2 &&
!memcmp(&(search_efivar->var.VariableName),
var_data->VariableName, strsize1) &&
!efi_guidcmp(search_efivar->var.VendorGuid,
var_data->VendorGuid)) {
found = 1;
break;
}
}
if (found) efivar = search_efivar;
status = efi.set_variable(var_data->VariableName,
&var_data->VendorGuid,
var_data->Attributes,
var_data->DataSize,
var_data->Data);
if (status != EFI_SUCCESS) {
printk(KERN_WARNING "set_variable() failed: status=%lx\n", status);
kfree(var_data);
spin_unlock(&efivars_lock);
return -EIO;
}
if (!var_data->DataSize || !var_data->Attributes) {
/* We just deleted the NVRAM variable */
remove_proc_entry(efivar->entry->name, efi_vars_dir);
list_del(&efivar->list);
kfree(efivar);
}
spin_unlock(&efivars_lock);
/* If this is a new variable, set up the proc entry for it. */
if (!found) {
efivar_create_proc_entry(utf8_strsize(var_data->VariableName,
1024),
var_data->VariableName,
&var_data->VendorGuid);
}
kfree(var_data);
return size;
}
/*
* The EFI system table contains pointers to the SAL system table,
* HCDP, ACPI, SMBIOS, etc, that may be useful to applications.
*/
static ssize_t
efi_systab_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
{
void *data;
u8 *proc_buffer;
ssize_t size, length;
int ret;
const int max_nr_entries = 7; /* num ptrs to tables we could expose */
const int max_line_len = 80;
if (!efi.systab)
return 0;
proc_buffer = kmalloc(max_nr_entries * max_line_len, GFP_KERNEL);
if (!proc_buffer)
return -ENOMEM;
length = 0;
if (efi.mps)
length += sprintf(proc_buffer + length, "MPS=0x%lx\n", __pa(efi.mps));
if (efi.acpi20)
length += sprintf(proc_buffer + length, "ACPI20=0x%lx\n", __pa(efi.acpi20));
if (efi.acpi)
length += sprintf(proc_buffer + length, "ACPI=0x%lx\n", __pa(efi.acpi));
if (efi.smbios)
length += sprintf(proc_buffer + length, "SMBIOS=0x%lx\n", __pa(efi.smbios));
if (efi.sal_systab)
length += sprintf(proc_buffer + length, "SAL=0x%lx\n", __pa(efi.sal_systab));
if (efi.hcdp)
length += sprintf(proc_buffer + length, "HCDP=0x%lx\n", __pa(efi.hcdp));
if (efi.boot_info)
length += sprintf(proc_buffer + length, "BOOTINFO=0x%lx\n", __pa(efi.boot_info));
if (*ppos >= length) {
ret = 0;
goto out;
}
data = proc_buffer + file->f_pos;
size = length - file->f_pos;
if (size > count)
size = count;
if (copy_to_user(buffer, data, size)) {
ret = -EFAULT;
goto out;
}
*ppos += size;
ret = size;
out:
kfree(proc_buffer);
return ret;
}
static struct proc_dir_entry *efi_systab_entry;
static struct file_operations efi_systab_fops = {
.read = efi_systab_read,
};
static ssize_t
efi_fpswa_read (struct file *file, char *buffer, size_t count, loff_t *ppos)
{
ssize_t size, length;
char str[32];
void *data;
snprintf(str, sizeof(str), "revision=%u.%u\n",
fpswa_interface->revision >> 16, fpswa_interface->revision & 0xffff);
length = strlen(str);
if (*ppos >= length)
return 0;
data = str + file->f_pos;
size = length - file->f_pos;
if (size > count)
size = count;
if (copy_to_user(buffer, data, size))
return -EFAULT;
*ppos += size;
return size;
}
static struct proc_dir_entry *efi_fpswa_entry;
static struct file_operations efi_fpswa_fops = {
.read = efi_fpswa_read,
};
static int __init
efivars_init(void)
{
efi_status_t status;
efi_guid_t vendor_guid;
efi_char16_t *variable_name = kmalloc(1024, GFP_KERNEL);
unsigned long variable_name_size = 1024;
printk(KERN_INFO "EFI Variables Facility v%s\n", EFIVARS_VERSION);
/* Since efi.c happens before procfs is available,
we create the directory here if it doesn't
already exist. There's probably a better way
to do this.
*/
if (!efi_dir)
efi_dir = proc_mkdir("efi", NULL);
efi_systab_entry = create_proc_entry("systab", S_IRUSR | S_IRGRP, efi_dir);
if (efi_systab_entry)
efi_systab_entry->proc_fops = &efi_systab_fops;
if (fpswa_interface) {
efi_fpswa_entry = create_proc_entry("fpswa", S_IRUGO, efi_dir);
if (efi_fpswa_entry)
efi_fpswa_entry->proc_fops = &efi_fpswa_fops;
}
efi_vars_dir = proc_mkdir("vars", efi_dir);
/* Per EFI spec, the maximum storage allocated for both
the variable name and variable data is 1024 bytes.
*/
memset(variable_name, 0, 1024);
do {
variable_name_size=1024;
status = efi.get_next_variable(&variable_name_size,
variable_name,
&vendor_guid);
switch (status) {
case EFI_SUCCESS:
efivar_create_proc_entry(variable_name_size,
variable_name,
&vendor_guid);
break;
case EFI_NOT_FOUND:
break;
default:
printk(KERN_WARNING "get_next_variable: status=%lx\n", status);
status = EFI_NOT_FOUND;
break;
}
} while (status != EFI_NOT_FOUND);
kfree(variable_name);
return 0;
}
static void __exit
efivars_exit(void)
{
struct list_head *pos, *n;
efivar_entry_t *efivar;
spin_lock(&efivars_lock);
if (efi_systab_entry)
remove_proc_entry(efi_systab_entry->name, efi_dir);
list_for_each_safe(pos, n, &efivar_list) {
efivar = efivar_entry(pos);
remove_proc_entry(efivar->entry->name, efi_vars_dir);
list_del(&efivar->list);
kfree(efivar);
}
spin_unlock(&efivars_lock);
remove_proc_entry(efi_vars_dir->name, efi_dir);
}
module_init(efivars_init);
module_exit(efivars_exit);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-indent-level: 4
* c-brace-imaginary-offset: 0
* c-brace-offset: -4
* c-argdecl-indent: 4
* c-label-offset: -4
* c-continued-statement-offset: 4
* c-continued-brace-offset: 0
* indent-tabs-mode: nil
* tab-width: 8
* End:
*/
arch/ia64/mm/init.c
View file @ 855647c4
......@@ -18,6 +18,7 @@
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <asm/a.out.h>
#include <asm/bitops.h>
......
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