Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932916Ab3CTOwA (ORCPT ); Wed, 20 Mar 2013 10:52:00 -0400 Received: from mail-we0-f177.google.com ([74.125.82.177]:36725 "EHLO mail-we0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757130Ab3CTOvd (ORCPT ); Wed, 20 Mar 2013 10:51:33 -0400 From: Grant Likely To: linux-kernel@vger.kernel.org, devicetree-discuss@lists.ozlabs.org Cc: Grant Likely , Rob Herring , Greg Kroah-Hartman , Benjamin Herrenschmidt , "David S. Miller" Subject: [PATCH 2/2] of: remove /proc/device-tree Date: Wed, 20 Mar 2013 14:51:14 +0000 Message-Id: <1363791074-16415-3-git-send-email-grant.likely@secretlab.ca> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1363791074-16415-1-git-send-email-grant.likely@secretlab.ca> References: <1363791074-16415-1-git-send-email-grant.likely@secretlab.ca> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12881 Lines: 478 The same data is now available in sysfs, so we can remove the code that exports it in /proc and replace it with a symlink to the sysfs version. Tested on versatile qemu model and mpc5200 eval board. More testing would be appreciated. Signed-off-by: Grant Likely Cc: Rob Herring Cc: Greg Kroah-Hartman Cc: Benjamin Herrenschmidt Cc: David S. Miller --- drivers/of/Kconfig | 8 -- drivers/of/base.c | 59 +----------- fs/proc/Makefile | 1 - fs/proc/proc_devtree.c | 243 ----------------------------------------------- fs/proc/root.c | 3 - include/linux/of.h | 1 - include/linux/proc_fs.h | 16 ---- 7 files changed, 2 insertions(+), 329 deletions(-) delete mode 100644 fs/proc/proc_devtree.c diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig index d2d7be9..edb97e2 100644 --- a/drivers/of/Kconfig +++ b/drivers/of/Kconfig @@ -7,14 +7,6 @@ config OF menu "Device Tree and Open Firmware support" depends on OF -config PROC_DEVICETREE - bool "Support for device tree in /proc" - depends on PROC_FS && !SPARC - help - This option adds a device-tree directory under /proc which contains - an image of the device tree that the kernel copies from Open - Firmware or other boot firmware. If unsure, say Y here. - config OF_SELFTEST bool "Device Tree Runtime self tests" help diff --git a/drivers/of/base.c b/drivers/of/base.c index 363e98b..6714114 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -184,6 +184,8 @@ static int __of_node_add(struct device_node *np) np->kobj.kset = of_kset; if (!np->parent) { /* Nodes without parents are new top level trees */ + if (extra == 0) + proc_symlink("device-tree", NULL, "/sys/firmware/ofw/device-tree-0"); rc = kobject_add(&np->kobj, NULL, "device-tree-%i", extra++); } else { name = kbasename(np->full_name); @@ -1375,12 +1377,6 @@ int of_add_property(struct device_node *np, struct property *prop) *next = prop; raw_spin_unlock_irqrestore(&devtree_lock, flags); -#ifdef CONFIG_PROC_DEVICETREE - /* try to add to proc as well if it was initialized */ - if (np->pde) - proc_device_tree_add_prop(np->pde, prop); -#endif /* CONFIG_PROC_DEVICETREE */ - return 0; } @@ -1421,12 +1417,6 @@ int of_remove_property(struct device_node *np, struct property *prop) if (!found) return -ENODEV; -#ifdef CONFIG_PROC_DEVICETREE - /* try to remove the proc node as well */ - if (np->pde) - proc_device_tree_remove_prop(np->pde, prop); -#endif /* CONFIG_PROC_DEVICETREE */ - return 0; } @@ -1475,12 +1465,6 @@ int of_update_property(struct device_node *np, struct property *newprop) if (!found) return -ENODEV; -#ifdef CONFIG_PROC_DEVICETREE - /* try to add to proc as well if it was initialized */ - if (np->pde) - proc_device_tree_update_prop(np->pde, newprop, oldprop); -#endif /* CONFIG_PROC_DEVICETREE */ - return 0; } @@ -1515,22 +1499,6 @@ int of_reconfig_notify(unsigned long action, void *p) return notifier_to_errno(rc); } -#ifdef CONFIG_PROC_DEVICETREE -static void of_add_proc_dt_entry(struct device_node *dn) -{ - struct proc_dir_entry *ent; - - ent = proc_mkdir(strrchr(dn->full_name, '/') + 1, dn->parent->pde); - if (ent) - proc_device_tree_add_node(dn, ent); -} -#else -static void of_add_proc_dt_entry(struct device_node *dn) -{ - return; -} -#endif - /** * of_attach_node - Plug a device node into the tree and global list. */ @@ -1551,31 +1519,9 @@ int of_attach_node(struct device_node *np) raw_spin_unlock_irqrestore(&devtree_lock, flags); of_node_add(np); - of_add_proc_dt_entry(np); return 0; } -#ifdef CONFIG_PROC_DEVICETREE -static void of_remove_proc_dt_entry(struct device_node *dn) -{ - struct device_node *parent = dn->parent; - struct property *prop = dn->properties; - - while (prop) { - remove_proc_entry(prop->name, dn->pde); - prop = prop->next; - } - - if (dn->pde) - remove_proc_entry(dn->pde->name, parent->pde); -} -#else -static void of_remove_proc_dt_entry(struct device_node *dn) -{ - return; -} -#endif - /** * of_detach_node - "Unplug" a node from the device tree. * @@ -1631,7 +1577,6 @@ int of_detach_node(struct device_node *np) of_node_set_flag(np, OF_DETACHED); raw_spin_unlock_irqrestore(&devtree_lock, flags); - of_remove_proc_dt_entry(np); of_node_remove(np); return rc; } diff --git a/fs/proc/Makefile b/fs/proc/Makefile index 712f24d..81d413b 100644 --- a/fs/proc/Makefile +++ b/fs/proc/Makefile @@ -27,6 +27,5 @@ proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o proc-$(CONFIG_NET) += proc_net.o proc-$(CONFIG_PROC_KCORE) += kcore.o proc-$(CONFIG_PROC_VMCORE) += vmcore.o -proc-$(CONFIG_PROC_DEVICETREE) += proc_devtree.o proc-$(CONFIG_PRINTK) += kmsg.o proc-$(CONFIG_PROC_PAGE_MONITOR) += page.o diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c deleted file mode 100644 index 30b590f..0000000 --- a/fs/proc/proc_devtree.c +++ /dev/null @@ -1,243 +0,0 @@ -/* - * proc_devtree.c - handles /proc/device-tree - * - * Copyright 1997 Paul Mackerras - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "internal.h" - -static inline void set_node_proc_entry(struct device_node *np, - struct proc_dir_entry *de) -{ -#ifdef HAVE_ARCH_DEVTREE_FIXUPS - np->pde = de; -#endif -} - -static struct proc_dir_entry *proc_device_tree; - -/* - * Supply data on a read from /proc/device-tree/node/property. - */ -static int property_proc_show(struct seq_file *m, void *v) -{ - struct property *pp = m->private; - - seq_write(m, pp->value, pp->length); - return 0; -} - -static int property_proc_open(struct inode *inode, struct file *file) -{ - return single_open(file, property_proc_show, PDE(inode)->data); -} - -static const struct file_operations property_proc_fops = { - .owner = THIS_MODULE, - .open = property_proc_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -/* - * For a node with a name like "gc@10", we make symlinks called "gc" - * and "@10" to it. - */ - -/* - * Add a property to a node - */ -static struct proc_dir_entry * -__proc_device_tree_add_prop(struct proc_dir_entry *de, struct property *pp, - const char *name) -{ - struct proc_dir_entry *ent; - - /* - * Unfortunately proc_register puts each new entry - * at the beginning of the list. So we rearrange them. - */ - ent = proc_create_data(name, - strncmp(name, "security-", 9) ? S_IRUGO : S_IRUSR, - de, &property_proc_fops, pp); - if (ent == NULL) - return NULL; - - if (!strncmp(name, "security-", 9)) - ent->size = 0; /* don't leak number of password chars */ - else - ent->size = pp->length; - - return ent; -} - - -void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop) -{ - __proc_device_tree_add_prop(pde, prop, prop->name); -} - -void proc_device_tree_remove_prop(struct proc_dir_entry *pde, - struct property *prop) -{ - remove_proc_entry(prop->name, pde); -} - -void proc_device_tree_update_prop(struct proc_dir_entry *pde, - struct property *newprop, - struct property *oldprop) -{ - struct proc_dir_entry *ent; - - if (!oldprop) { - proc_device_tree_add_prop(pde, newprop); - return; - } - - for (ent = pde->subdir; ent != NULL; ent = ent->next) - if (ent->data == oldprop) - break; - if (ent == NULL) { - pr_warn("device-tree: property \"%s\" does not exist\n", - oldprop->name); - } else { - ent->data = newprop; - ent->size = newprop->length; - } -} - -/* - * Various dodgy firmware might give us nodes and/or properties with - * conflicting names. That's generally ok, except for exporting via /proc, - * so munge names here to ensure they're unique. - */ - -static int duplicate_name(struct proc_dir_entry *de, const char *name) -{ - struct proc_dir_entry *ent; - int found = 0; - - spin_lock(&proc_subdir_lock); - - for (ent = de->subdir; ent != NULL; ent = ent->next) { - if (strcmp(ent->name, name) == 0) { - found = 1; - break; - } - } - - spin_unlock(&proc_subdir_lock); - - return found; -} - -static const char *fixup_name(struct device_node *np, struct proc_dir_entry *de, - const char *name) -{ - char *fixed_name; - int fixup_len = strlen(name) + 2 + 1; /* name + #x + \0 */ - int i = 1, size; - -realloc: - fixed_name = kmalloc(fixup_len, GFP_KERNEL); - if (fixed_name == NULL) { - pr_err("device-tree: Out of memory trying to fixup " - "name \"%s\"\n", name); - return name; - } - -retry: - size = snprintf(fixed_name, fixup_len, "%s#%d", name, i); - size++; /* account for NULL */ - - if (size > fixup_len) { - /* We ran out of space, free and reallocate. */ - kfree(fixed_name); - fixup_len = size; - goto realloc; - } - - if (duplicate_name(de, fixed_name)) { - /* Multiple duplicates. Retry with a different offset. */ - i++; - goto retry; - } - - pr_warn("device-tree: Duplicate name in %s, renamed to \"%s\"\n", - np->full_name, fixed_name); - - return fixed_name; -} - -/* - * Process a node, adding entries for its children and its properties. - */ -void proc_device_tree_add_node(struct device_node *np, - struct proc_dir_entry *de) -{ - struct property *pp; - struct proc_dir_entry *ent; - struct device_node *child; - const char *p; - - set_node_proc_entry(np, de); - for (child = NULL; (child = of_get_next_child(np, child));) { - /* Use everything after the last slash, or the full name */ - p = kbasename(child->full_name); - - if (duplicate_name(de, p)) - p = fixup_name(np, de, p); - - ent = proc_mkdir(p, de); - if (ent == NULL) - break; - proc_device_tree_add_node(child, ent); - } - of_node_put(child); - - for (pp = np->properties; pp != NULL; pp = pp->next) { - p = pp->name; - - if (strchr(p, '/')) - continue; - - if (duplicate_name(de, p)) - p = fixup_name(np, de, p); - - ent = __proc_device_tree_add_prop(de, pp, p); - if (ent == NULL) - break; - } -} - -/* - * Called on initialization to set up the /proc/device-tree subtree - */ -void __init proc_device_tree_init(void) -{ - struct device_node *root; - - proc_device_tree = proc_mkdir("device-tree", NULL); - if (proc_device_tree == NULL) - return; - root = of_find_node_by_path("/"); - if (root == NULL) { - pr_debug("/proc/device-tree: can't find root\n"); - return; - } - proc_device_tree_add_node(root, proc_device_tree); - of_node_put(root); -} diff --git a/fs/proc/root.c b/fs/proc/root.c index c6e9fac..04846a4 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -173,9 +173,6 @@ void __init proc_root_init(void) proc_mkdir("openprom", NULL); #endif proc_tty_init(); -#ifdef CONFIG_PROC_DEVICETREE - proc_device_tree_init(); -#endif proc_mkdir("bus", NULL); proc_sys_init(); } diff --git a/include/linux/of.h b/include/linux/of.h index 2399c8f..f48302c 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -57,7 +57,6 @@ struct device_node { struct device_node *sibling; struct device_node *next; /* next device of same type */ struct device_node *allnext; /* next in list of all nodes */ - struct proc_dir_entry *pde; /* this node's proc directory */ struct kobject kobj; unsigned long _flags; void *data; diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index 8307f2f..90496b5 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -136,22 +136,6 @@ static inline void proc_tty_init(void) extern void proc_tty_register_driver(struct tty_driver *driver); extern void proc_tty_unregister_driver(struct tty_driver *driver); -/* - * proc_devtree.c - */ -#ifdef CONFIG_PROC_DEVICETREE -struct device_node; -struct property; -extern void proc_device_tree_init(void); -extern void proc_device_tree_add_node(struct device_node *, struct proc_dir_entry *); -extern void proc_device_tree_add_prop(struct proc_dir_entry *pde, struct property *prop); -extern void proc_device_tree_remove_prop(struct proc_dir_entry *pde, - struct property *prop); -extern void proc_device_tree_update_prop(struct proc_dir_entry *pde, - struct property *newprop, - struct property *oldprop); -#endif /* CONFIG_PROC_DEVICETREE */ - extern struct proc_dir_entry *proc_symlink(const char *, struct proc_dir_entry *, const char *); extern struct proc_dir_entry *proc_mkdir(const char *,struct proc_dir_entry *); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/