[patch 1/3] efivars driver update and move

[Matt Tolentino]

Andrew,

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.

The patch is against 2.6.6-rc2 and has been tested on a 
Tiger4 system and an x86 system with EFI.  The second and
third patches will follow.  Please apply.

thanks,
matt



diff -urN linux-2.6.6-rc2/arch/ia64/Kconfig linux-2.6.6-rc2-mod/arch/ia64/Kconfig
--- linux-2.6.6-rc2/arch/ia64/Kconfig	2004-04-20 14:30:12.000000000 -0700
+++ linux-2.6.6-rc2-mod/arch/ia64/Kconfig	2004-04-20 23:50:48.389320376 -0700
@@ -294,16 +294,6 @@
 	  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
diff -urN linux-2.6.6-rc2/arch/ia64/kernel/efi.c linux-2.6.6-rc2-mod/arch/ia64/kernel/efi.c
--- linux-2.6.6-rc2/arch/ia64/kernel/efi.c	2004-04-20 14:28:22.000000000 -0700
+++ linux-2.6.6-rc2-mod/arch/ia64/kernel/efi.c	2004-04-20 23:24:15.000000000 -0700
@@ -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 @@
 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 @@
 	return 0;
 }
 
-static void __exit
-efivars_exit (void)
-{
-#ifdef CONFIG_PROC_FS
- 	remove_proc_entry(efi_dir->name, NULL);
-#endif
-}
diff -urN linux-2.6.6-rc2/arch/ia64/kernel/efivars.c linux-2.6.6-rc2-mod/arch/ia64/kernel/efivars.c
--- linux-2.6.6-rc2/arch/ia64/kernel/efivars.c	2004-04-20 14:29:08.000000000 -0700
+++ linux-2.6.6-rc2-mod/arch/ia64/kernel/efivars.c	1969-12-31 16:00:00.000000000 -0800
@@ -1,549 +0,0 @@
-/*
- * EFI Variables - efivars.c
- *
- * Copyright (C) 2001 Dell Computer Corporation <Matt_Domsch@xxxxxxxx>
- *
- * 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@xxxxxxxxxx>
- *   Provide FPSWA version number via /proc/efi/fpswa
- *
- *  10 Dec 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx>
- *   fix locking per Peter Chubb's findings
- *
- *  25 Mar 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx>
- *   move uuid_unparse() to include/asm-ia64/efi.h:efi_guid_unparse()
- *
- *  12 Feb 2002 - Matt Domsch <Matt_Domsch@xxxxxxxx>
- *   use list_for_each_safe when deleting vars.
- *   remove ifdef CONFIG_SMP around include <linux/smp.h>
- *   v0.04 release to linux-ia64@xxxxxxxxxxxxx
- *
- *  20 April 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx>
- *   Moved vars from /proc/efi to /proc/efi/vars, and made
- *   efi.c own the /proc/efi directory.
- *   v0.03 release to linux-ia64@xxxxxxxxxxxxx
- *
- *  26 March 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx>
- *   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@xxxxxxxx>
- *   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@xxxxxxxxxxxxx
- *
- *  26 February 2001 - Matt Domsch <Matt_Domsch@xxxxxxxx>
- *   v0.01 release to linux-ia64@xxxxxxxxxxxxx
- */
-
-#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@xxxxxxxx>");
-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:
- */
diff -urN linux-2.6.6-rc2/arch/ia64/kernel/Makefile linux-2.6.6-rc2-mod/arch/ia64/kernel/Makefile
--- linux-2.6.6-rc2/arch/ia64/kernel/Makefile	2004-04-20 14:30:29.000000000 -0700
+++ linux-2.6.6-rc2-mod/arch/ia64/kernel/Makefile	2004-04-20 23:25:33.000000000 -0700
@@ -8,7 +8,6 @@
 	 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
diff -urN linux-2.6.6-rc2/arch/ia64/mm/init.c linux-2.6.6-rc2-mod/arch/ia64/mm/init.c
--- linux-2.6.6-rc2/arch/ia64/mm/init.c	2004-04-20 14:29:07.000000000 -0700
+++ linux-2.6.6-rc2-mod/arch/ia64/mm/init.c	2004-04-20 23:27:09.000000000 -0700
@@ -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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