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kernel/resource.c
45.4 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * linux/kernel/resource.c * * Copyright (C) 1999 Linus Torvalds * Copyright (C) 1999 Martin Mares <mj@ucw.cz> * * Arbitrary resource management. */ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/export.h> |
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#include <linux/errno.h> #include <linux/ioport.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/fs.h> #include <linux/proc_fs.h> |
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#include <linux/sched.h> |
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#include <linux/seq_file.h> |
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#include <linux/device.h> |
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#include <linux/pfn.h> |
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#include <linux/mm.h> |
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#include <linux/resource_ext.h> |
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#include <asm/io.h> struct resource ioport_resource = { .name = "PCI IO", |
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.start = 0, |
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.end = IO_SPACE_LIMIT, .flags = IORESOURCE_IO, }; |
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EXPORT_SYMBOL(ioport_resource); struct resource iomem_resource = { .name = "PCI mem", |
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.start = 0, .end = -1, |
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.flags = IORESOURCE_MEM, }; |
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EXPORT_SYMBOL(iomem_resource); |
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/* constraints to be met while allocating resources */ struct resource_constraint { resource_size_t min, max, align; resource_size_t (*alignf)(void *, const struct resource *, resource_size_t, resource_size_t); void *alignf_data; }; |
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static DEFINE_RWLOCK(resource_lock); |
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/* * For memory hotplug, there is no way to free resource entries allocated * by boot mem after the system is up. So for reusing the resource entry * we need to remember the resource. */ static struct resource *bootmem_resource_free; static DEFINE_SPINLOCK(bootmem_resource_lock); |
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static struct resource *next_resource(struct resource *p, bool sibling_only) |
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{ |
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/* Caller wants to traverse through siblings only */ if (sibling_only) return p->sibling; |
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if (p->child) return p->child; while (!p->sibling && p->parent) p = p->parent; return p->sibling; } |
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static void *r_next(struct seq_file *m, void *v, loff_t *pos) { struct resource *p = v; (*pos)++; return (void *)next_resource(p, false); } |
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#ifdef CONFIG_PROC_FS enum { MAX_IORES_LEVEL = 5 }; |
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static void *r_start(struct seq_file *m, loff_t *pos) __acquires(resource_lock) { |
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struct resource *p = PDE_DATA(file_inode(m->file)); |
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loff_t l = 0; read_lock(&resource_lock); for (p = p->child; p && l < *pos; p = r_next(m, p, &l)) ; return p; } static void r_stop(struct seq_file *m, void *v) __releases(resource_lock) { read_unlock(&resource_lock); } static int r_show(struct seq_file *m, void *v) { |
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struct resource *root = PDE_DATA(file_inode(m->file)); |
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struct resource *r = v, *p; |
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unsigned long long start, end; |
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int width = root->end < 0x10000 ? 4 : 8; int depth; for (depth = 0, p = r; depth < MAX_IORES_LEVEL; depth++, p = p->parent) if (p->parent == root) break; |
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if (file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN)) { start = r->start; end = r->end; } else { start = end = 0; } |
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seq_printf(m, "%*s%0*llx-%0*llx : %s ", |
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depth * 2, "", |
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width, start, width, end, |
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r->name ? r->name : "<BAD>"); return 0; } |
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static const struct seq_operations resource_op = { |
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.start = r_start, .next = r_next, .stop = r_stop, .show = r_show, }; |
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static int __init ioresources_init(void) { |
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proc_create_seq_data("ioports", 0, NULL, &resource_op, &ioport_resource); proc_create_seq_data("iomem", 0, NULL, &resource_op, &iomem_resource); |
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return 0; } __initcall(ioresources_init); #endif /* CONFIG_PROC_FS */ |
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static void free_resource(struct resource *res) { if (!res) return; if (!PageSlab(virt_to_head_page(res))) { spin_lock(&bootmem_resource_lock); res->sibling = bootmem_resource_free; bootmem_resource_free = res; spin_unlock(&bootmem_resource_lock); } else { kfree(res); } } static struct resource *alloc_resource(gfp_t flags) { struct resource *res = NULL; spin_lock(&bootmem_resource_lock); if (bootmem_resource_free) { res = bootmem_resource_free; bootmem_resource_free = res->sibling; } spin_unlock(&bootmem_resource_lock); if (res) memset(res, 0, sizeof(struct resource)); else res = kzalloc(sizeof(struct resource), flags); return res; } |
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/* Return the conflict entry if you can't request it */ static struct resource * __request_resource(struct resource *root, struct resource *new) { |
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resource_size_t start = new->start; resource_size_t end = new->end; |
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struct resource *tmp, **p; if (end < start) return root; if (start < root->start) return root; if (end > root->end) return root; p = &root->child; for (;;) { tmp = *p; if (!tmp || tmp->start > end) { new->sibling = tmp; *p = new; new->parent = root; return NULL; } p = &tmp->sibling; if (tmp->end < start) continue; return tmp; } } |
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static int __release_resource(struct resource *old, bool release_child) |
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{ |
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struct resource *tmp, **p, *chd; |
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p = &old->parent->child; for (;;) { tmp = *p; if (!tmp) break; if (tmp == old) { |
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if (release_child || !(tmp->child)) { *p = tmp->sibling; } else { for (chd = tmp->child;; chd = chd->sibling) { chd->parent = tmp->parent; if (!(chd->sibling)) break; } *p = tmp->child; chd->sibling = tmp->sibling; } |
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old->parent = NULL; return 0; } p = &tmp->sibling; } return -EINVAL; } |
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static void __release_child_resources(struct resource *r) { struct resource *tmp, *p; resource_size_t size; p = r->child; r->child = NULL; while (p) { tmp = p; p = p->sibling; tmp->parent = NULL; tmp->sibling = NULL; __release_child_resources(tmp); printk(KERN_DEBUG "release child resource %pR ", tmp); /* need to restore size, and keep flags */ size = resource_size(tmp); tmp->start = 0; tmp->end = size - 1; } } void release_child_resources(struct resource *r) { write_lock(&resource_lock); __release_child_resources(r); write_unlock(&resource_lock); } |
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/** |
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* request_resource_conflict - request and reserve an I/O or memory resource |
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* @root: root resource descriptor * @new: resource descriptor desired by caller * |
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* Returns 0 for success, conflict resource on error. |
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*/ |
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struct resource *request_resource_conflict(struct resource *root, struct resource *new) |
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{ struct resource *conflict; write_lock(&resource_lock); conflict = __request_resource(root, new); write_unlock(&resource_lock); |
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return conflict; } /** * request_resource - request and reserve an I/O or memory resource * @root: root resource descriptor * @new: resource descriptor desired by caller * * Returns 0 for success, negative error code on error. */ int request_resource(struct resource *root, struct resource *new) { struct resource *conflict; conflict = request_resource_conflict(root, new); |
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return conflict ? -EBUSY : 0; } EXPORT_SYMBOL(request_resource); |
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/** |
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* release_resource - release a previously reserved resource * @old: resource pointer */ |
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int release_resource(struct resource *old) { int retval; write_lock(&resource_lock); |
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retval = __release_resource(old, true); |
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write_unlock(&resource_lock); return retval; } EXPORT_SYMBOL(release_resource); |
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/** * Finds the lowest iomem resource that covers part of [@start..@end]. The * caller must specify @start, @end, @flags, and @desc (which may be |
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* IORES_DESC_NONE). * |
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* If a resource is found, returns 0 and @*res is overwritten with the part * of the resource that's within [@start..@end]; if none is found, returns |
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* -ENODEV. Returns -EINVAL for invalid parameters. |
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* * This function walks the whole tree and not just first level children |
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* unless @first_lvl is true. |
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* * @start: start address of the resource searched for * @end: end address of same resource * @flags: flags which the resource must have * @desc: descriptor the resource must have * @first_lvl: walk only the first level children, if set * @res: return ptr, if resource found |
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*/ |
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static int find_next_iomem_res(resource_size_t start, resource_size_t end, unsigned long flags, unsigned long desc, |
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bool first_lvl, struct resource *res) |
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{ |
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bool siblings_only = true; |
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struct resource *p; |
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if (!res) return -EINVAL; |
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|
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if (start >= end) return -EINVAL; |
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|
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read_lock(&resource_lock); |
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for (p = iomem_resource.child; p; p = next_resource(p, siblings_only)) { /* If we passed the resource we are looking for, stop */ |
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if (p->start > end) { p = NULL; break; } |
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/* Skip until we find a range that matches what we look for */ if (p->end < start) continue; /* * Now that we found a range that matches what we look for, * check the flags and the descriptor. If we were not asked to * use only the first level, start looking at children as well. */ siblings_only = first_lvl; if ((p->flags & flags) != flags) continue; if ((desc != IORES_DESC_NONE) && (desc != p->desc)) continue; /* Found a match, break */ break; |
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} |
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|
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if (p) { /* copy data */ |
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*res = (struct resource) { .start = max(start, p->start), .end = min(end, p->end), .flags = p->flags, .desc = p->desc, .parent = p->parent, }; |
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} |
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read_unlock(&resource_lock); |
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return p ? 0 : -ENODEV; |
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} |
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|
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static int __walk_iomem_res_desc(resource_size_t start, resource_size_t end, unsigned long flags, unsigned long desc, |
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bool first_lvl, void *arg, |
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int (*func)(struct resource *, void *)) |
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{ |
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struct resource res; |
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int ret = -EINVAL; |
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|
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while (start < end && |
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!find_next_iomem_res(start, end, flags, desc, first_lvl, &res)) { |
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ret = (*func)(&res, arg); |
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if (ret) break; |
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start = res.end + 1; |
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} return ret; } |
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/** |
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* Walks through iomem resources and calls func() with matching resource |
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* ranges. This walks through whole tree and not just first level children. * All the memory ranges which overlap start,end and also match flags and |
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* desc are valid candidates. * * @desc: I/O resource descriptor. Use IORES_DESC_NONE to skip @desc check. * @flags: I/O resource flags * @start: start addr * @end: end addr |
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* @arg: function argument for the callback @func * @func: callback function that is called for each qualifying resource area |
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* * NOTE: For a new descriptor search, define a new IORES_DESC in * <linux/ioport.h> and set it in 'desc' of a target resource entry. */ int walk_iomem_res_desc(unsigned long desc, unsigned long flags, u64 start, |
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u64 end, void *arg, int (*func)(struct resource *, void *)) |
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{ |
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return __walk_iomem_res_desc(start, end, flags, desc, false, arg, func); |
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} |
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EXPORT_SYMBOL_GPL(walk_iomem_res_desc); |
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/* |
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* This function calls the @func callback against all memory ranges of type * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY. * Now, this function is only for System RAM, it deals with full ranges and * not PFNs. If resources are not PFN-aligned, dealing with PFNs can truncate * ranges. |
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*/ int walk_system_ram_res(u64 start, u64 end, void *arg, |
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int (*func)(struct resource *, void *)) |
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{ |
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unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
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|
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return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE, true, |
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arg, func); } /* * This function calls the @func callback against all memory ranges, which * are ranges marked as IORESOURCE_MEM and IORESOUCE_BUSY. */ int walk_mem_res(u64 start, u64 end, void *arg, int (*func)(struct resource *, void *)) { |
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unsigned long flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
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|
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return __walk_iomem_res_desc(start, end, flags, IORES_DESC_NONE, true, |
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arg, func); |
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} |
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/* |
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* This function calls the @func callback against all memory ranges of type * System RAM which are marked as IORESOURCE_SYSTEM_RAM and IORESOUCE_BUSY. * It is to be used only for System RAM. |
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* * This will find System RAM ranges that are children of top-level resources * in addition to top-level System RAM resources. |
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*/ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, |
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void *arg, int (*func)(unsigned long, unsigned long, void *)) |
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{ |
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resource_size_t start, end; unsigned long flags; |
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struct resource res; |
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unsigned long pfn, end_pfn; |
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int ret = -EINVAL; |
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|
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start = (u64) start_pfn << PAGE_SHIFT; end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1; flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; while (start < end && !find_next_iomem_res(start, end, flags, IORES_DESC_NONE, |
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false, &res)) { |
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pfn = PFN_UP(res.start); end_pfn = PFN_DOWN(res.end + 1); |
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if (end_pfn > pfn) |
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ret = (*func)(pfn, end_pfn - pfn, arg); |
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if (ret) break; |
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start = res.end + 1; |
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} return ret; } |
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static int __is_ram(unsigned long pfn, unsigned long nr_pages, void *arg) { return 1; } |
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|
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/* * This generic page_is_ram() returns true if specified address is |
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* registered as System RAM in iomem_resource list. |
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*/ |
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int __weak page_is_ram(unsigned long pfn) |
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{ return walk_system_ram_range(pfn, 1, NULL, __is_ram) == 1; } |
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EXPORT_SYMBOL_GPL(page_is_ram); |
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|
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/** * region_intersects() - determine intersection of region with known resources * @start: region start address * @size: size of region |
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* @flags: flags of resource (in iomem_resource) * @desc: descriptor of resource (in iomem_resource) or IORES_DESC_NONE |
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* |
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* Check if the specified region partially overlaps or fully eclipses a |
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* resource identified by @flags and @desc (optional with IORES_DESC_NONE). * Return REGION_DISJOINT if the region does not overlap @flags/@desc, * return REGION_MIXED if the region overlaps @flags/@desc and another * resource, and return REGION_INTERSECTS if the region overlaps @flags/@desc * and no other defined resource. Note that REGION_INTERSECTS is also * returned in the case when the specified region overlaps RAM and undefined * memory holes. |
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* * region_intersect() is used by memory remapping functions to ensure * the user is not remapping RAM and is a vast speed up over walking * through the resource table page by page. |
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*/ |
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int region_intersects(resource_size_t start, size_t size, unsigned long flags, unsigned long desc) |
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{ |
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struct resource res; |
124fe20d9 mm: enhance regio... |
518 519 |
int type = 0; int other = 0; struct resource *p; |
67cf13cee x86: optimize res... |
520 |
|
f6c6010a0 mm/resource: Use ... |
521 522 |
res.start = start; res.end = start + size - 1; |
67cf13cee x86: optimize res... |
523 524 |
read_lock(&resource_lock); for (p = iomem_resource.child; p ; p = p->sibling) { |
1c29f25bf memremap: Change ... |
525 526 527 |
bool is_type = (((p->flags & flags) == flags) && ((desc == IORES_DESC_NONE) || (desc == p->desc))); |
124fe20d9 mm: enhance regio... |
528 |
|
f6c6010a0 mm/resource: Use ... |
529 |
if (resource_overlaps(p, &res)) |
124fe20d9 mm: enhance regio... |
530 |
is_type ? type++ : other++; |
67cf13cee x86: optimize res... |
531 532 |
} read_unlock(&resource_lock); |
124fe20d9 mm: enhance regio... |
533 534 535 536 537 538 539 540 |
if (other == 0) return type ? REGION_INTERSECTS : REGION_DISJOINT; if (type) return REGION_MIXED; return REGION_DISJOINT; |
67cf13cee x86: optimize res... |
541 |
} |
1c29f25bf memremap: Change ... |
542 |
EXPORT_SYMBOL_GPL(region_intersects); |
67cf13cee x86: optimize res... |
543 |
|
fcb119183 resources: add ar... |
544 545 546 |
void __weak arch_remove_reservations(struct resource *avail) { } |
a9cea0174 resources: add a ... |
547 548 549 550 551 552 553 |
static resource_size_t simple_align_resource(void *data, const struct resource *avail, resource_size_t size, resource_size_t align) { return avail->start; } |
5d6b1fa30 resources: factor... |
554 555 556 557 558 559 560 561 |
static void resource_clip(struct resource *res, resource_size_t min, resource_size_t max) { if (res->start < min) res->start = min; if (res->end > max) res->end = max; } |
1da177e4c Linux-2.6.12-rc2 |
562 |
/* |
23c570a67 resource: ability... |
563 564 |
* Find empty slot in the resource tree with the given range and * alignment constraints |
1da177e4c Linux-2.6.12-rc2 |
565 |
*/ |
23c570a67 resource: ability... |
566 567 568 569 |
static int __find_resource(struct resource *root, struct resource *old, struct resource *new, resource_size_t size, struct resource_constraint *constraint) |
1da177e4c Linux-2.6.12-rc2 |
570 571 |
{ struct resource *this = root->child; |
a1862e310 resources: handle... |
572 |
struct resource tmp = *new, avail, alloc; |
1da177e4c Linux-2.6.12-rc2 |
573 |
|
0e2c8b8f5 resources: fix ca... |
574 |
tmp.start = root->start; |
1da177e4c Linux-2.6.12-rc2 |
575 |
/* |
c0f5ac542 Revert "resources... |
576 577 |
* Skip past an allocated resource that starts at 0, since the assignment * of this->start - 1 to tmp->end below would cause an underflow. |
1da177e4c Linux-2.6.12-rc2 |
578 |
*/ |
23c570a67 resource: ability... |
579 580 |
if (this && this->start == root->start) { tmp.start = (this == old) ? old->start : this->end + 1; |
1da177e4c Linux-2.6.12-rc2 |
581 582 |
this = this->sibling; } |
c0f5ac542 Revert "resources... |
583 |
for(;;) { |
1da177e4c Linux-2.6.12-rc2 |
584 |
if (this) |
23c570a67 resource: ability... |
585 |
tmp.end = (this == old) ? this->end : this->start - 1; |
1da177e4c Linux-2.6.12-rc2 |
586 |
else |
0e2c8b8f5 resources: fix ca... |
587 |
tmp.end = root->end; |
5d6b1fa30 resources: factor... |
588 |
|
47ea91b40 Resource: fix wro... |
589 590 |
if (tmp.end < tmp.start) goto next; |
23c570a67 resource: ability... |
591 |
resource_clip(&tmp, constraint->min, constraint->max); |
fcb119183 resources: add ar... |
592 |
arch_remove_reservations(&tmp); |
a9cea0174 resources: add a ... |
593 |
|
a1862e310 resources: handle... |
594 |
/* Check for overflow after ALIGN() */ |
23c570a67 resource: ability... |
595 |
avail.start = ALIGN(tmp.start, constraint->align); |
a1862e310 resources: handle... |
596 |
avail.end = tmp.end; |
5edb93b89 resource: Add res... |
597 |
avail.flags = new->flags & ~IORESOURCE_UNSET; |
a1862e310 resources: handle... |
598 |
if (avail.start >= tmp.start) { |
5edb93b89 resource: Add res... |
599 |
alloc.flags = avail.flags; |
23c570a67 resource: ability... |
600 601 |
alloc.start = constraint->alignf(constraint->alignf_data, &avail, size, constraint->align); |
a1862e310 resources: handle... |
602 |
alloc.end = alloc.start + size - 1; |
60bb83b81 resource: fix int... |
603 604 |
if (alloc.start <= alloc.end && resource_contains(&avail, &alloc)) { |
a1862e310 resources: handle... |
605 606 607 608 |
new->start = alloc.start; new->end = alloc.end; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
609 |
} |
47ea91b40 Resource: fix wro... |
610 611 |
next: if (!this || this->end == root->end) |
1da177e4c Linux-2.6.12-rc2 |
612 |
break; |
47ea91b40 Resource: fix wro... |
613 |
|
23c570a67 resource: ability... |
614 615 |
if (this != old) tmp.start = this->end + 1; |
1da177e4c Linux-2.6.12-rc2 |
616 617 618 619 |
this = this->sibling; } return -EBUSY; } |
23c570a67 resource: ability... |
620 621 622 623 624 625 626 627 628 |
/* * Find empty slot in the resource tree given range and alignment. */ static int find_resource(struct resource *root, struct resource *new, resource_size_t size, struct resource_constraint *constraint) { return __find_resource(root, NULL, new, size, constraint); } |
e1ca66d1b [PATCH] kernel-do... |
629 |
/** |
23c570a67 resource: ability... |
630 631 632 633 634 635 636 637 638 |
* reallocate_resource - allocate a slot in the resource tree given range & alignment. * The resource will be relocated if the new size cannot be reallocated in the * current location. * * @root: root resource descriptor * @old: resource descriptor desired by caller * @newsize: new size of the resource descriptor * @constraint: the size and alignment constraints to be met. */ |
28ab49ff7 kernel/resource.c... |
639 |
static int reallocate_resource(struct resource *root, struct resource *old, |
b69c2e20f resource: Clean i... |
640 641 |
resource_size_t newsize, struct resource_constraint *constraint) |
23c570a67 resource: ability... |
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 |
{ int err=0; struct resource new = *old; struct resource *conflict; write_lock(&resource_lock); if ((err = __find_resource(root, old, &new, newsize, constraint))) goto out; if (resource_contains(&new, old)) { old->start = new.start; old->end = new.end; goto out; } if (old->child) { err = -EBUSY; goto out; } if (resource_contains(old, &new)) { old->start = new.start; old->end = new.end; } else { |
ff3cc952d resource: Add rem... |
667 |
__release_resource(old, true); |
23c570a67 resource: ability... |
668 669 670 671 672 673 674 675 676 677 678 679 680 |
*old = new; conflict = __request_resource(root, old); BUG_ON(conflict); } out: write_unlock(&resource_lock); return err; } /** * allocate_resource - allocate empty slot in the resource tree given range & alignment. * The resource will be reallocated with a new size if it was already allocated |
e1ca66d1b [PATCH] kernel-do... |
681 682 683 |
* @root: root resource descriptor * @new: resource descriptor desired by caller * @size: requested resource region size |
ee5e5683d kernel/resource.c... |
684 685 |
* @min: minimum boundary to allocate * @max: maximum boundary to allocate |
e1ca66d1b [PATCH] kernel-do... |
686 687 688 |
* @align: alignment requested, in bytes * @alignf: alignment function, optional, called if not NULL * @alignf_data: arbitrary data to pass to the @alignf function |
1da177e4c Linux-2.6.12-rc2 |
689 690 |
*/ int allocate_resource(struct resource *root, struct resource *new, |
d75fc8bbc [PATCH] 64bit res... |
691 692 |
resource_size_t size, resource_size_t min, resource_size_t max, resource_size_t align, |
b26b2d494 resource/PCI: ali... |
693 |
resource_size_t (*alignf)(void *, |
3b7a17fcd resource/PCI: mar... |
694 |
const struct resource *, |
b26b2d494 resource/PCI: ali... |
695 696 |
resource_size_t, resource_size_t), |
1da177e4c Linux-2.6.12-rc2 |
697 698 699 |
void *alignf_data) { int err; |
23c570a67 resource: ability... |
700 |
struct resource_constraint constraint; |
1da177e4c Linux-2.6.12-rc2 |
701 |
|
a9cea0174 resources: add a ... |
702 703 |
if (!alignf) alignf = simple_align_resource; |
23c570a67 resource: ability... |
704 705 706 707 708 709 710 711 712 713 714 |
constraint.min = min; constraint.max = max; constraint.align = align; constraint.alignf = alignf; constraint.alignf_data = alignf_data; if ( new->parent ) { /* resource is already allocated, try reallocating with the new constraints */ return reallocate_resource(root, new, size, &constraint); } |
1da177e4c Linux-2.6.12-rc2 |
715 |
write_lock(&resource_lock); |
23c570a67 resource: ability... |
716 |
err = find_resource(root, new, size, &constraint); |
1da177e4c Linux-2.6.12-rc2 |
717 718 719 720 721 722 723 |
if (err >= 0 && __request_resource(root, new)) err = -EBUSY; write_unlock(&resource_lock); return err; } EXPORT_SYMBOL(allocate_resource); |
1c388919d resources: Add lo... |
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
/** * lookup_resource - find an existing resource by a resource start address * @root: root resource descriptor * @start: resource start address * * Returns a pointer to the resource if found, NULL otherwise */ struct resource *lookup_resource(struct resource *root, resource_size_t start) { struct resource *res; read_lock(&resource_lock); for (res = root->child; res; res = res->sibling) { if (res->start == start) break; } read_unlock(&resource_lock); return res; } |
bef69ea0d Resource handling... |
744 745 746 |
/* * Insert a resource into the resource tree. If successful, return NULL, * otherwise return the conflicting resource (compare to __request_resource()) |
1da177e4c Linux-2.6.12-rc2 |
747 |
*/ |
bef69ea0d Resource handling... |
748 |
static struct resource * __insert_resource(struct resource *parent, struct resource *new) |
1da177e4c Linux-2.6.12-rc2 |
749 |
{ |
1da177e4c Linux-2.6.12-rc2 |
750 |
struct resource *first, *next; |
d33b6fba2 Resources: insert... |
751 |
for (;; parent = first) { |
d33b6fba2 Resources: insert... |
752 753 |
first = __request_resource(parent, new); if (!first) |
bef69ea0d Resource handling... |
754 |
return first; |
d33b6fba2 Resources: insert... |
755 |
|
d33b6fba2 Resources: insert... |
756 |
if (first == parent) |
bef69ea0d Resource handling... |
757 |
return first; |
5de1cb2d0 kernel/resource.c... |
758 759 |
if (WARN_ON(first == new)) /* duplicated insertion */ return first; |
d33b6fba2 Resources: insert... |
760 761 762 763 764 |
if ((first->start > new->start) || (first->end < new->end)) break; if ((first->start == new->start) && (first->end == new->end)) break; |
1da177e4c Linux-2.6.12-rc2 |
765 766 767 768 769 |
} for (next = first; ; next = next->sibling) { /* Partial overlap? Bad, and unfixable */ if (next->start < new->start || next->end > new->end) |
bef69ea0d Resource handling... |
770 |
return next; |
1da177e4c Linux-2.6.12-rc2 |
771 772 773 774 775 |
if (!next->sibling) break; if (next->sibling->start > new->end) break; } |
1da177e4c Linux-2.6.12-rc2 |
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 |
new->parent = parent; new->sibling = next->sibling; new->child = first; next->sibling = NULL; for (next = first; next; next = next->sibling) next->parent = new; if (parent->child == first) { parent->child = new; } else { next = parent->child; while (next->sibling != first) next = next->sibling; next->sibling = new; } |
bef69ea0d Resource handling... |
792 793 |
return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
794 |
|
bef69ea0d Resource handling... |
795 |
/** |
66f1207bc resources: add in... |
796 |
* insert_resource_conflict - Inserts resource in the resource tree |
bef69ea0d Resource handling... |
797 798 799 |
* @parent: parent of the new resource * @new: new resource to insert * |
66f1207bc resources: add in... |
800 |
* Returns 0 on success, conflict resource if the resource can't be inserted. |
bef69ea0d Resource handling... |
801 |
* |
66f1207bc resources: add in... |
802 |
* This function is equivalent to request_resource_conflict when no conflict |
bef69ea0d Resource handling... |
803 804 805 806 |
* happens. If a conflict happens, and the conflicting resources * entirely fit within the range of the new resource, then the new * resource is inserted and the conflicting resources become children of * the new resource. |
ff3cc952d resource: Add rem... |
807 808 809 |
* * This function is intended for producers of resources, such as FW modules * and bus drivers. |
bef69ea0d Resource handling... |
810 |
*/ |
66f1207bc resources: add in... |
811 |
struct resource *insert_resource_conflict(struct resource *parent, struct resource *new) |
bef69ea0d Resource handling... |
812 813 814 815 816 817 |
{ struct resource *conflict; write_lock(&resource_lock); conflict = __insert_resource(parent, new); write_unlock(&resource_lock); |
66f1207bc resources: add in... |
818 819 820 821 822 823 824 825 826 |
return conflict; } /** * insert_resource - Inserts a resource in the resource tree * @parent: parent of the new resource * @new: new resource to insert * * Returns 0 on success, -EBUSY if the resource can't be inserted. |
ff3cc952d resource: Add rem... |
827 828 829 |
* * This function is intended for producers of resources, such as FW modules * and bus drivers. |
66f1207bc resources: add in... |
830 831 832 833 834 835 |
*/ int insert_resource(struct resource *parent, struct resource *new) { struct resource *conflict; conflict = insert_resource_conflict(parent, new); |
bef69ea0d Resource handling... |
836 837 |
return conflict ? -EBUSY : 0; } |
8095d0f22 resource: Export ... |
838 |
EXPORT_SYMBOL_GPL(insert_resource); |
bef69ea0d Resource handling... |
839 840 841 |
/** * insert_resource_expand_to_fit - Insert a resource into the resource tree |
6781f4ae3 kernel/resource.c... |
842 |
* @root: root resource descriptor |
bef69ea0d Resource handling... |
843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 |
* @new: new resource to insert * * Insert a resource into the resource tree, possibly expanding it in order * to make it encompass any conflicting resources. */ void insert_resource_expand_to_fit(struct resource *root, struct resource *new) { if (new->parent) return; write_lock(&resource_lock); for (;;) { struct resource *conflict; conflict = __insert_resource(root, new); if (!conflict) break; if (conflict == root) break; /* Ok, expand resource to cover the conflict, then try again .. */ if (conflict->start < new->start) new->start = conflict->start; if (conflict->end > new->end) new->end = conflict->end; printk("Expanded resource %s due to conflict with %s ", new->name, conflict->name); } |
1da177e4c Linux-2.6.12-rc2 |
872 |
write_unlock(&resource_lock); |
1da177e4c Linux-2.6.12-rc2 |
873 |
} |
ff3cc952d resource: Add rem... |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 |
/** * remove_resource - Remove a resource in the resource tree * @old: resource to remove * * Returns 0 on success, -EINVAL if the resource is not valid. * * This function removes a resource previously inserted by insert_resource() * or insert_resource_conflict(), and moves the children (if any) up to * where they were before. insert_resource() and insert_resource_conflict() * insert a new resource, and move any conflicting resources down to the * children of the new resource. * * insert_resource(), insert_resource_conflict() and remove_resource() are * intended for producers of resources, such as FW modules and bus drivers. */ int remove_resource(struct resource *old) { int retval; write_lock(&resource_lock); retval = __release_resource(old, false); write_unlock(&resource_lock); return retval; } |
8095d0f22 resource: Export ... |
898 |
EXPORT_SYMBOL_GPL(remove_resource); |
ff3cc952d resource: Add rem... |
899 |
|
ae8e3a915 resource: add __a... |
900 901 |
static int __adjust_resource(struct resource *res, resource_size_t start, resource_size_t size) |
1da177e4c Linux-2.6.12-rc2 |
902 903 |
{ struct resource *tmp, *parent = res->parent; |
d75fc8bbc [PATCH] 64bit res... |
904 |
resource_size_t end = start + size - 1; |
1da177e4c Linux-2.6.12-rc2 |
905 |
int result = -EBUSY; |
82ec90eac resources: allow ... |
906 907 |
if (!parent) goto skip; |
1da177e4c Linux-2.6.12-rc2 |
908 909 |
if ((start < parent->start) || (end > parent->end)) goto out; |
1da177e4c Linux-2.6.12-rc2 |
910 911 912 913 914 915 916 917 918 919 |
if (res->sibling && (res->sibling->start <= end)) goto out; tmp = parent->child; if (tmp != res) { while (tmp->sibling != res) tmp = tmp->sibling; if (start <= tmp->end) goto out; } |
82ec90eac resources: allow ... |
920 921 922 923 |
skip: for (tmp = res->child; tmp; tmp = tmp->sibling) if ((tmp->start < start) || (tmp->end > end)) goto out; |
1da177e4c Linux-2.6.12-rc2 |
924 925 926 927 928 |
res->start = start; res->end = end; result = 0; out: |
ae8e3a915 resource: add __a... |
929 930 931 932 933 934 935 936 937 938 939 940 941 942 |
return result; } /** * adjust_resource - modify a resource's start and size * @res: resource to modify * @start: new start value * @size: new size * * Given an existing resource, change its start and size to match the * arguments. Returns 0 on success, -EBUSY if it can't fit. * Existing children of the resource are assumed to be immutable. */ int adjust_resource(struct resource *res, resource_size_t start, |
b69c2e20f resource: Clean i... |
943 |
resource_size_t size) |
ae8e3a915 resource: add __a... |
944 945 946 947 948 |
{ int result; write_lock(&resource_lock); result = __adjust_resource(res, start, size); |
1da177e4c Linux-2.6.12-rc2 |
949 950 951 |
write_unlock(&resource_lock); return result; } |
241057486 kernel/resource.c... |
952 |
EXPORT_SYMBOL(adjust_resource); |
1da177e4c Linux-2.6.12-rc2 |
953 |
|
b69c2e20f resource: Clean i... |
954 955 956 |
static void __init __reserve_region_with_split(struct resource *root, resource_size_t start, resource_size_t end, const char *name) |
268364a0f IO resources: add... |
957 958 959 |
{ struct resource *parent = root; struct resource *conflict; |
ebff7d8f2 mem hotunplug: fi... |
960 |
struct resource *res = alloc_resource(GFP_ATOMIC); |
4965f5667 kernel/resource.c... |
961 |
struct resource *next_res = NULL; |
f37e2334b resource: Set typ... |
962 |
int type = resource_type(root); |
268364a0f IO resources: add... |
963 964 965 966 967 968 969 |
if (!res) return; res->name = name; res->start = start; res->end = end; |
f37e2334b resource: Set typ... |
970 |
res->flags = type | IORESOURCE_BUSY; |
43ee493bd resource: Add I/O... |
971 |
res->desc = IORES_DESC_NONE; |
268364a0f IO resources: add... |
972 |
|
4965f5667 kernel/resource.c... |
973 |
while (1) { |
268364a0f IO resources: add... |
974 |
|
4965f5667 kernel/resource.c... |
975 976 977 978 979 980 981 982 |
conflict = __request_resource(parent, res); if (!conflict) { if (!next_res) break; res = next_res; next_res = NULL; continue; } |
268364a0f IO resources: add... |
983 |
|
4965f5667 kernel/resource.c... |
984 985 986 |
/* conflict covered whole area */ if (conflict->start <= res->start && conflict->end >= res->end) { |
ebff7d8f2 mem hotunplug: fi... |
987 |
free_resource(res); |
4965f5667 kernel/resource.c... |
988 989 990 991 992 993 994 995 996 |
WARN_ON(next_res); break; } /* failed, split and try again */ if (conflict->start > res->start) { end = res->end; res->end = conflict->start - 1; if (conflict->end < end) { |
ebff7d8f2 mem hotunplug: fi... |
997 |
next_res = alloc_resource(GFP_ATOMIC); |
4965f5667 kernel/resource.c... |
998 |
if (!next_res) { |
ebff7d8f2 mem hotunplug: fi... |
999 |
free_resource(res); |
4965f5667 kernel/resource.c... |
1000 1001 1002 1003 1004 |
break; } next_res->name = name; next_res->start = conflict->end + 1; next_res->end = end; |
f37e2334b resource: Set typ... |
1005 |
next_res->flags = type | IORESOURCE_BUSY; |
43ee493bd resource: Add I/O... |
1006 |
next_res->desc = IORES_DESC_NONE; |
4965f5667 kernel/resource.c... |
1007 1008 1009 1010 1011 |
} } else { res->start = conflict->end + 1; } } |
268364a0f IO resources: add... |
1012 1013 |
} |
b69c2e20f resource: Clean i... |
1014 1015 1016 |
void __init reserve_region_with_split(struct resource *root, resource_size_t start, resource_size_t end, const char *name) |
268364a0f IO resources: add... |
1017 |
{ |
65fed8f6f resource: make su... |
1018 |
int abort = 0; |
268364a0f IO resources: add... |
1019 |
write_lock(&resource_lock); |
65fed8f6f resource: make su... |
1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 |
if (root->start > start || root->end < end) { pr_err("requested range [0x%llx-0x%llx] not in root %pr ", (unsigned long long)start, (unsigned long long)end, root); if (start > root->end || end < root->start) abort = 1; else { if (end > root->end) end = root->end; if (start < root->start) start = root->start; pr_err("fixing request to [0x%llx-0x%llx] ", (unsigned long long)start, (unsigned long long)end); } dump_stack(); } if (!abort) __reserve_region_with_split(root, start, end, name); |
268364a0f IO resources: add... |
1041 1042 |
write_unlock(&resource_lock); } |
884525655 PCI: clean up res... |
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 |
/** * resource_alignment - calculate resource's alignment * @res: resource pointer * * Returns alignment on success, 0 (invalid alignment) on failure. */ resource_size_t resource_alignment(struct resource *res) { switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) { case IORESOURCE_SIZEALIGN: |
1a4e564b7 resource: add res... |
1053 |
return resource_size(res); |
884525655 PCI: clean up res... |
1054 1055 1056 1057 1058 1059 |
case IORESOURCE_STARTALIGN: return res->start; default: return 0; } } |
1da177e4c Linux-2.6.12-rc2 |
1060 1061 1062 1063 1064 1065 |
/* * This is compatibility stuff for IO resources. * * Note how this, unlike the above, knows about * the IO flag meanings (busy etc). * |
e1ca66d1b [PATCH] kernel-do... |
1066 |
* request_region creates a new busy region. |
1da177e4c Linux-2.6.12-rc2 |
1067 |
* |
e1ca66d1b [PATCH] kernel-do... |
1068 1069 |
* release_region releases a matching busy region. */ |
8b6d043b7 resource: shared ... |
1070 |
static DECLARE_WAIT_QUEUE_HEAD(muxed_resource_wait); |
e1ca66d1b [PATCH] kernel-do... |
1071 1072 1073 1074 1075 1076 |
/** * __request_region - create a new busy resource region * @parent: parent resource descriptor * @start: resource start address * @n: resource region size * @name: reserving caller's ID string |
6ae301e85 resources: fix pa... |
1077 |
* @flags: IO resource flags |
1da177e4c Linux-2.6.12-rc2 |
1078 |
*/ |
d75fc8bbc [PATCH] 64bit res... |
1079 1080 |
struct resource * __request_region(struct resource *parent, resource_size_t start, resource_size_t n, |
e8de1481f resource: allow M... |
1081 |
const char *name, int flags) |
1da177e4c Linux-2.6.12-rc2 |
1082 |
{ |
8b6d043b7 resource: shared ... |
1083 |
DECLARE_WAITQUEUE(wait, current); |
ebff7d8f2 mem hotunplug: fi... |
1084 |
struct resource *res = alloc_resource(GFP_KERNEL); |
3234ac664 /dev/mem: Revoke ... |
1085 |
struct resource *orig_parent = parent; |
1da177e4c Linux-2.6.12-rc2 |
1086 |
|
c26ec88ea resources: tidy _... |
1087 1088 1089 1090 1091 1092 |
if (!res) return NULL; res->name = name; res->start = start; res->end = start + n - 1; |
c26ec88ea resources: tidy _... |
1093 1094 1095 1096 1097 |
write_lock(&resource_lock); for (;;) { struct resource *conflict; |
4e0d8f7ef resource: Change ... |
1098 1099 1100 |
res->flags = resource_type(parent) | resource_ext_type(parent); res->flags |= IORESOURCE_BUSY | flags; res->desc = parent->desc; |
c26ec88ea resources: tidy _... |
1101 1102 |
conflict = __request_resource(parent, res); if (!conflict) |
1da177e4c Linux-2.6.12-rc2 |
1103 |
break; |
b926b7f3b mm/resource: Move... |
1104 1105 1106 1107 1108 1109 1110 1111 1112 |
/* * mm/hmm.c reserves physical addresses which then * become unavailable to other users. Conflicts are * not expected. Warn to aid debugging if encountered. */ if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) { pr_warn("Unaddressable device %s %pR conflicts with %pR", conflict->name, conflict, res); } |
c26ec88ea resources: tidy _... |
1113 |
if (conflict != parent) { |
59ceeaaf3 kernel/resource.c... |
1114 1115 |
if (!(conflict->flags & IORESOURCE_BUSY)) { parent = conflict; |
c26ec88ea resources: tidy _... |
1116 |
continue; |
59ceeaaf3 kernel/resource.c... |
1117 |
} |
1da177e4c Linux-2.6.12-rc2 |
1118 |
} |
8b6d043b7 resource: shared ... |
1119 1120 1121 1122 1123 1124 1125 1126 1127 |
if (conflict->flags & flags & IORESOURCE_MUXED) { add_wait_queue(&muxed_resource_wait, &wait); write_unlock(&resource_lock); set_current_state(TASK_UNINTERRUPTIBLE); schedule(); remove_wait_queue(&muxed_resource_wait, &wait); write_lock(&resource_lock); continue; } |
c26ec88ea resources: tidy _... |
1128 |
/* Uhhuh, that didn't work out.. */ |
ebff7d8f2 mem hotunplug: fi... |
1129 |
free_resource(res); |
c26ec88ea resources: tidy _... |
1130 1131 |
res = NULL; break; |
1da177e4c Linux-2.6.12-rc2 |
1132 |
} |
c26ec88ea resources: tidy _... |
1133 |
write_unlock(&resource_lock); |
3234ac664 /dev/mem: Revoke ... |
1134 1135 1136 |
if (res && orig_parent == &iomem_resource) revoke_devmem(res); |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1139 |
EXPORT_SYMBOL(__request_region); |
e1ca66d1b [PATCH] kernel-do... |
1140 |
/** |
e1ca66d1b [PATCH] kernel-do... |
1141 1142 1143 1144 1145 1146 1147 |
* __release_region - release a previously reserved resource region * @parent: parent resource descriptor * @start: resource start address * @n: resource region size * * The described resource region must match a currently busy region. */ |
d75fc8bbc [PATCH] 64bit res... |
1148 |
void __release_region(struct resource *parent, resource_size_t start, |
b69c2e20f resource: Clean i... |
1149 |
resource_size_t n) |
1da177e4c Linux-2.6.12-rc2 |
1150 1151 |
{ struct resource **p; |
d75fc8bbc [PATCH] 64bit res... |
1152 |
resource_size_t end; |
1da177e4c Linux-2.6.12-rc2 |
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 |
p = &parent->child; end = start + n - 1; write_lock(&resource_lock); for (;;) { struct resource *res = *p; if (!res) break; if (res->start <= start && res->end >= end) { if (!(res->flags & IORESOURCE_BUSY)) { p = &res->child; continue; } if (res->start != start || res->end != end) break; *p = res->sibling; write_unlock(&resource_lock); |
8b6d043b7 resource: shared ... |
1173 1174 |
if (res->flags & IORESOURCE_MUXED) wake_up(&muxed_resource_wait); |
ebff7d8f2 mem hotunplug: fi... |
1175 |
free_resource(res); |
1da177e4c Linux-2.6.12-rc2 |
1176 1177 1178 1179 1180 1181 |
return; } p = &res->sibling; } write_unlock(&resource_lock); |
685143ac1 [PATCH] 64bit res... |
1182 1183 1184 1185 |
printk(KERN_WARNING "Trying to free nonexistent resource " "<%016llx-%016llx> ", (unsigned long long)start, (unsigned long long)end); |
1da177e4c Linux-2.6.12-rc2 |
1186 |
} |
1da177e4c Linux-2.6.12-rc2 |
1187 |
EXPORT_SYMBOL(__release_region); |
825f787bb resource: add rel... |
1188 1189 1190 |
#ifdef CONFIG_MEMORY_HOTREMOVE /** * release_mem_region_adjustable - release a previously reserved memory region |
825f787bb resource: add rel... |
1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 |
* @start: resource start address * @size: resource region size * * This interface is intended for memory hot-delete. The requested region * is released from a currently busy memory resource. The requested region * must either match exactly or fit into a single busy resource entry. In * the latter case, the remaining resource is adjusted accordingly. * Existing children of the busy memory resource must be immutable in the * request. * * Note: * - Additional release conditions, such as overlapping region, can be * supported after they are confirmed as valid cases. * - When a busy memory resource gets split into two entries, the code * assumes that all children remain in the lower address entry for * simplicity. Enhance this logic when necessary. */ |
cb8e3c8b4 kernel/resource: ... |
1208 |
void release_mem_region_adjustable(resource_size_t start, resource_size_t size) |
825f787bb resource: add rel... |
1209 |
{ |
cb8e3c8b4 kernel/resource: ... |
1210 |
struct resource *parent = &iomem_resource; |
ec62d04e3 kernel/resource: ... |
1211 1212 |
struct resource *new_res = NULL; bool alloc_nofail = false; |
825f787bb resource: add rel... |
1213 1214 |
struct resource **p; struct resource *res; |
825f787bb resource: add rel... |
1215 |
resource_size_t end; |
825f787bb resource: add rel... |
1216 1217 |
end = start + size - 1; |
ec62d04e3 kernel/resource: ... |
1218 1219 |
if (WARN_ON_ONCE((start < parent->start) || (end > parent->end))) return; |
825f787bb resource: add rel... |
1220 |
|
ec62d04e3 kernel/resource: ... |
1221 1222 1223 1224 1225 1226 1227 1228 1229 |
/* * We free up quite a lot of memory on memory hotunplug (esp., memap), * just before releasing the region. This is highly unlikely to * fail - let's play save and make it never fail as the caller cannot * perform any error handling (e.g., trying to re-add memory will fail * similarly). */ retry: new_res = alloc_resource(GFP_KERNEL | (alloc_nofail ? __GFP_NOFAIL : 0)); |
825f787bb resource: add rel... |
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 |
p = &parent->child; write_lock(&resource_lock); while ((res = *p)) { if (res->start >= end) break; /* look for the next resource if it does not fit into */ if (res->start > start || res->end < end) { p = &res->sibling; continue; } |
65c787841 kernel, resource:... |
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 |
/* * All memory regions added from memory-hotplug path have the * flag IORESOURCE_SYSTEM_RAM. If the resource does not have * this flag, we know that we are dealing with a resource coming * from HMM/devm. HMM/devm use another mechanism to add/release * a resource. This goes via devm_request_mem_region and * devm_release_mem_region. * HMM/devm take care to release their resources when they want, * so if we are dealing with them, let us just back off here. */ if (!(res->flags & IORESOURCE_SYSRAM)) { |
65c787841 kernel, resource:... |
1254 1255 |
break; } |
825f787bb resource: add rel... |
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 |
if (!(res->flags & IORESOURCE_MEM)) break; if (!(res->flags & IORESOURCE_BUSY)) { p = &res->child; continue; } /* found the target resource; let's adjust accordingly */ if (res->start == start && res->end == end) { /* free the whole entry */ *p = res->sibling; |
ebff7d8f2 mem hotunplug: fi... |
1268 |
free_resource(res); |
825f787bb resource: add rel... |
1269 1270 |
} else if (res->start == start && res->end != end) { /* adjust the start */ |
ec62d04e3 kernel/resource: ... |
1271 1272 |
WARN_ON_ONCE(__adjust_resource(res, end + 1, res->end - end)); |
825f787bb resource: add rel... |
1273 1274 |
} else if (res->start != start && res->end == end) { /* adjust the end */ |
ec62d04e3 kernel/resource: ... |
1275 1276 |
WARN_ON_ONCE(__adjust_resource(res, res->start, start - res->start)); |
825f787bb resource: add rel... |
1277 |
} else { |
ec62d04e3 kernel/resource: ... |
1278 |
/* split into two entries - we need a new resource */ |
825f787bb resource: add rel... |
1279 |
if (!new_res) { |
ec62d04e3 kernel/resource: ... |
1280 1281 1282 1283 1284 1285 |
new_res = alloc_resource(GFP_ATOMIC); if (!new_res) { alloc_nofail = true; write_unlock(&resource_lock); goto retry; } |
825f787bb resource: add rel... |
1286 1287 1288 1289 1290 |
} new_res->name = res->name; new_res->start = end + 1; new_res->end = res->end; new_res->flags = res->flags; |
43ee493bd resource: Add I/O... |
1291 |
new_res->desc = res->desc; |
825f787bb resource: add rel... |
1292 1293 1294 |
new_res->parent = res->parent; new_res->sibling = res->sibling; new_res->child = NULL; |
ec62d04e3 kernel/resource: ... |
1295 1296 |
if (WARN_ON_ONCE(__adjust_resource(res, res->start, start - res->start))) |
825f787bb resource: add rel... |
1297 1298 1299 1300 1301 1302 1303 1304 1305 |
break; res->sibling = new_res; new_res = NULL; } break; } write_unlock(&resource_lock); |
ebff7d8f2 mem hotunplug: fi... |
1306 |
free_resource(new_res); |
825f787bb resource: add rel... |
1307 1308 |
} #endif /* CONFIG_MEMORY_HOTREMOVE */ |
9ca6551ee mm/memory_hotplug... |
1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 |
#ifdef CONFIG_MEMORY_HOTPLUG static bool system_ram_resources_mergeable(struct resource *r1, struct resource *r2) { /* We assume either r1 or r2 is IORESOURCE_SYSRAM_MERGEABLE. */ return r1->flags == r2->flags && r1->end + 1 == r2->start && r1->name == r2->name && r1->desc == r2->desc && !r1->child && !r2->child; } /* * merge_system_ram_resource - mark the System RAM resource mergeable and try to * merge it with adjacent, mergeable resources * @res: resource descriptor * * This interface is intended for memory hotplug, whereby lots of contiguous * system ram resources are added (e.g., via add_memory*()) by a driver, and * the actual resource boundaries are not of interest (e.g., it might be * relevant for DIMMs). Only resources that are marked mergeable, that have the * same parent, and that don't have any children are considered. All mergeable * resources must be immutable during the request. * * Note: * - The caller has to make sure that no pointers to resources that are * marked mergeable are used anymore after this call - the resource might * be freed and the pointer might be stale! * - release_mem_region_adjustable() will split on demand on memory hotunplug */ void merge_system_ram_resource(struct resource *res) { const unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; struct resource *cur; if (WARN_ON_ONCE((res->flags & flags) != flags)) return; write_lock(&resource_lock); res->flags |= IORESOURCE_SYSRAM_MERGEABLE; /* Try to merge with next item in the list. */ cur = res->sibling; if (cur && system_ram_resources_mergeable(res, cur)) { res->end = cur->end; res->sibling = cur->sibling; free_resource(cur); } /* Try to merge with previous item in the list. */ cur = res->parent->child; while (cur && cur->sibling != res) cur = cur->sibling; if (cur && system_ram_resources_mergeable(cur, res)) { cur->end = res->end; cur->sibling = res->sibling; free_resource(res); } write_unlock(&resource_lock); } #endif /* CONFIG_MEMORY_HOTPLUG */ |
1da177e4c Linux-2.6.12-rc2 |
1368 |
/* |
9ac7849e3 devres: device re... |
1369 1370 |
* Managed region resource */ |
8d38821cb resources: Add de... |
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
static void devm_resource_release(struct device *dev, void *ptr) { struct resource **r = ptr; release_resource(*r); } /** * devm_request_resource() - request and reserve an I/O or memory resource * @dev: device for which to request the resource * @root: root of the resource tree from which to request the resource * @new: descriptor of the resource to request * * This is a device-managed version of request_resource(). There is usually * no need to release resources requested by this function explicitly since * that will be taken care of when the device is unbound from its driver. * If for some reason the resource needs to be released explicitly, because * of ordering issues for example, drivers must call devm_release_resource() * rather than the regular release_resource(). * * When a conflict is detected between any existing resources and the newly * requested resource, an error message will be printed. * * Returns 0 on success or a negative error code on failure. */ int devm_request_resource(struct device *dev, struct resource *root, struct resource *new) { struct resource *conflict, **ptr; ptr = devres_alloc(devm_resource_release, sizeof(*ptr), GFP_KERNEL); if (!ptr) return -ENOMEM; *ptr = new; conflict = request_resource_conflict(root, new); if (conflict) { dev_err(dev, "resource collision: %pR conflicts with %s %pR ", new, conflict->name, conflict); devres_free(ptr); return -EBUSY; } devres_add(dev, ptr); return 0; } EXPORT_SYMBOL(devm_request_resource); static int devm_resource_match(struct device *dev, void *res, void *data) { struct resource **ptr = res; return *ptr == data; } /** * devm_release_resource() - release a previously requested resource * @dev: device for which to release the resource * @new: descriptor of the resource to release * * Releases a resource previously requested using devm_request_resource(). */ void devm_release_resource(struct device *dev, struct resource *new) { WARN_ON(devres_release(dev, devm_resource_release, devm_resource_match, new)); } EXPORT_SYMBOL(devm_release_resource); |
9ac7849e3 devres: device re... |
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 |
struct region_devres { struct resource *parent; resource_size_t start; resource_size_t n; }; static void devm_region_release(struct device *dev, void *res) { struct region_devres *this = res; __release_region(this->parent, this->start, this->n); } static int devm_region_match(struct device *dev, void *res, void *match_data) { struct region_devres *this = res, *match = match_data; return this->parent == match->parent && this->start == match->start && this->n == match->n; } |
b69c2e20f resource: Clean i... |
1461 1462 1463 |
struct resource * __devm_request_region(struct device *dev, struct resource *parent, resource_size_t start, resource_size_t n, const char *name) |
9ac7849e3 devres: device re... |
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 |
{ struct region_devres *dr = NULL; struct resource *res; dr = devres_alloc(devm_region_release, sizeof(struct region_devres), GFP_KERNEL); if (!dr) return NULL; dr->parent = parent; dr->start = start; dr->n = n; |
e8de1481f resource: allow M... |
1476 |
res = __request_region(parent, start, n, name, 0); |
9ac7849e3 devres: device re... |
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 |
if (res) devres_add(dev, dr); else devres_free(dr); return res; } EXPORT_SYMBOL(__devm_request_region); void __devm_release_region(struct device *dev, struct resource *parent, resource_size_t start, resource_size_t n) { struct region_devres match_data = { parent, start, n }; __release_region(parent, start, n); WARN_ON(devres_destroy(dev, devm_region_release, devm_region_match, &match_data)); } EXPORT_SYMBOL(__devm_release_region); /* |
ffd2e8df8 resource: Set typ... |
1498 |
* Reserve I/O ports or memory based on "reserve=" kernel parameter. |
1da177e4c Linux-2.6.12-rc2 |
1499 1500 1501 1502 1503 1504 1505 1506 |
*/ #define MAXRESERVE 4 static int __init reserve_setup(char *str) { static int reserved; static struct resource reserve[MAXRESERVE]; for (;;) { |
8bc1ad7dd kernel/resource.c... |
1507 |
unsigned int io_start, io_num; |
1da177e4c Linux-2.6.12-rc2 |
1508 |
int x = reserved; |
ffd2e8df8 resource: Set typ... |
1509 |
struct resource *parent; |
1da177e4c Linux-2.6.12-rc2 |
1510 |
|
ffd2e8df8 resource: Set typ... |
1511 |
if (get_option(&str, &io_start) != 2) |
1da177e4c Linux-2.6.12-rc2 |
1512 |
break; |
ffd2e8df8 resource: Set typ... |
1513 |
if (get_option(&str, &io_num) == 0) |
1da177e4c Linux-2.6.12-rc2 |
1514 1515 1516 |
break; if (x < MAXRESERVE) { struct resource *res = reserve + x; |
ffd2e8df8 resource: Set typ... |
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 |
/* * If the region starts below 0x10000, we assume it's * I/O port space; otherwise assume it's memory. */ if (io_start < 0x10000) { res->flags = IORESOURCE_IO; parent = &ioport_resource; } else { res->flags = IORESOURCE_MEM; parent = &iomem_resource; } |
1da177e4c Linux-2.6.12-rc2 |
1529 1530 1531 |
res->name = "reserved"; res->start = io_start; res->end = io_start + io_num - 1; |
ffd2e8df8 resource: Set typ... |
1532 |
res->flags |= IORESOURCE_BUSY; |
43ee493bd resource: Add I/O... |
1533 |
res->desc = IORES_DESC_NONE; |
1da177e4c Linux-2.6.12-rc2 |
1534 |
res->child = NULL; |
ffd2e8df8 resource: Set typ... |
1535 |
if (request_resource(parent, res) == 0) |
1da177e4c Linux-2.6.12-rc2 |
1536 1537 1538 1539 1540 |
reserved = x+1; } } return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1541 |
__setup("reserve=", reserve_setup); |
379daf629 IO resources, x86... |
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 |
/* * Check if the requested addr and size spans more than any slot in the * iomem resource tree. */ int iomem_map_sanity_check(resource_size_t addr, unsigned long size) { struct resource *p = &iomem_resource; int err = 0; loff_t l; read_lock(&resource_lock); for (p = p->child; p ; p = r_next(NULL, p, &l)) { /* * We can probably skip the resources without * IORESOURCE_IO attribute? */ if (p->start >= addr + size) continue; if (p->end < addr) continue; |
d68612b25 resources: fix x8... |
1563 1564 |
if (PFN_DOWN(p->start) <= PFN_DOWN(addr) && PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1)) |
379daf629 IO resources, x86... |
1565 |
continue; |
3ac52669c resources: skip s... |
1566 1567 1568 1569 1570 1571 1572 1573 |
/* * if a resource is "BUSY", it's not a hardware resource * but a driver mapping of such a resource; we don't want * to warn for those; some drivers legitimately map only * partial hardware resources. (example: vesafb) */ if (p->flags & IORESOURCE_BUSY) continue; |
e4c729664 resources: Clarif... |
1574 1575 |
printk(KERN_WARNING "resource sanity check: requesting [mem %#010llx-%#010llx], which spans more than %s %pR ", |
13eb83754 IO resources, x86... |
1576 1577 |
(unsigned long long)addr, (unsigned long long)(addr + size - 1), |
e4c729664 resources: Clarif... |
1578 |
p->name, p); |
379daf629 IO resources, x86... |
1579 1580 1581 1582 1583 1584 1585 |
err = -1; break; } read_unlock(&resource_lock); return err; } |
e8de1481f resource: allow M... |
1586 1587 1588 1589 1590 1591 1592 1593 1594 |
#ifdef CONFIG_STRICT_DEVMEM static int strict_iomem_checks = 1; #else static int strict_iomem_checks; #endif /* * check if an address is reserved in the iomem resource tree |
9825b451f kernel/resource: ... |
1595 |
* returns true if reserved, false if not reserved. |
e8de1481f resource: allow M... |
1596 |
*/ |
9825b451f kernel/resource: ... |
1597 |
bool iomem_is_exclusive(u64 addr) |
e8de1481f resource: allow M... |
1598 1599 |
{ struct resource *p = &iomem_resource; |
9825b451f kernel/resource: ... |
1600 |
bool err = false; |
e8de1481f resource: allow M... |
1601 1602 1603 1604 |
loff_t l; int size = PAGE_SIZE; if (!strict_iomem_checks) |
9825b451f kernel/resource: ... |
1605 |
return false; |
e8de1481f resource: allow M... |
1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 |
addr = addr & PAGE_MASK; read_lock(&resource_lock); for (p = p->child; p ; p = r_next(NULL, p, &l)) { /* * We can probably skip the resources without * IORESOURCE_IO attribute? */ if (p->start >= addr + size) break; if (p->end < addr) continue; |
90a545e98 restrict /dev/mem... |
1619 1620 1621 1622 1623 1624 1625 1626 1627 |
/* * A resource is exclusive if IORESOURCE_EXCLUSIVE is set * or CONFIG_IO_STRICT_DEVMEM is enabled and the * resource is busy. */ if ((p->flags & IORESOURCE_BUSY) == 0) continue; if (IS_ENABLED(CONFIG_IO_STRICT_DEVMEM) || p->flags & IORESOURCE_EXCLUSIVE) { |
9825b451f kernel/resource: ... |
1628 |
err = true; |
e8de1481f resource: allow M... |
1629 1630 1631 1632 1633 1634 1635 |
break; } } read_unlock(&resource_lock); return err; } |
90e978206 resources: Move s... |
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struct resource_entry *resource_list_create_entry(struct resource *res, size_t extra_size) { struct resource_entry *entry; entry = kzalloc(sizeof(*entry) + extra_size, GFP_KERNEL); if (entry) { INIT_LIST_HEAD(&entry->node); entry->res = res ? res : &entry->__res; } return entry; } EXPORT_SYMBOL(resource_list_create_entry); void resource_list_free(struct list_head *head) { struct resource_entry *entry, *tmp; list_for_each_entry_safe(entry, tmp, head, node) resource_list_destroy_entry(entry); } EXPORT_SYMBOL(resource_list_free); |
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#ifdef CONFIG_DEVICE_PRIVATE |
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static struct resource *__request_free_mem_region(struct device *dev, struct resource *base, unsigned long size, const char *name) |
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{ resource_size_t end, addr; struct resource *res; size = ALIGN(size, 1UL << PA_SECTION_SHIFT); end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1); addr = end - size + 1UL; for (; addr > size && addr >= base->start; addr -= size) { if (region_intersects(addr, size, 0, IORES_DESC_NONE) != REGION_DISJOINT) continue; |
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if (dev) res = devm_request_mem_region(dev, addr, size, name); else res = request_mem_region(addr, size, name); |
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if (!res) return ERR_PTR(-ENOMEM); res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY; return res; } return ERR_PTR(-ERANGE); } |
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/** * devm_request_free_mem_region - find free region for device private memory * * @dev: device struct to bind the resource to * @size: size in bytes of the device memory to add * @base: resource tree to look in * * This function tries to find an empty range of physical address big enough to * contain the new resource, so that it can later be hotplugged as ZONE_DEVICE * memory, which in turn allocates struct pages. */ struct resource *devm_request_free_mem_region(struct device *dev, struct resource *base, unsigned long size) { return __request_free_mem_region(dev, base, size, dev_name(dev)); } |
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EXPORT_SYMBOL_GPL(devm_request_free_mem_region); |
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struct resource *request_free_mem_region(struct resource *base, unsigned long size, const char *name) { return __request_free_mem_region(NULL, base, size, name); } EXPORT_SYMBOL_GPL(request_free_mem_region); |
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#endif /* CONFIG_DEVICE_PRIVATE */ |
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static int __init strict_iomem(char *str) { if (strstr(str, "relaxed")) strict_iomem_checks = 0; if (strstr(str, "strict")) strict_iomem_checks = 1; return 1; } __setup("iomem=", strict_iomem); |