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kernel/resource.c
39.6 KB
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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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/* |
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* Finds the lowest iomem resource existing within [res->start.res->end). * The caller must specify res->start, res->end, res->flags, and optionally |
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* desc. If found, returns 0, res is overwritten, if not found, returns -1. |
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* This function walks the whole tree and not just first level children until * and unless first_level_children_only is true. |
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*/ |
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static int find_next_iomem_res(struct resource *res, unsigned long desc, |
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bool first_level_children_only) |
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{ resource_size_t start, end; struct resource *p; |
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bool sibling_only = false; |
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BUG_ON(!res); start = res->start; end = res->end; |
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BUG_ON(start >= end); |
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|
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if (first_level_children_only) |
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sibling_only = true; |
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|
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read_lock(&resource_lock); for (p = iomem_resource.child; p; p = next_resource(p, sibling_only)) { |
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if ((p->flags & res->flags) != res->flags) |
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continue; |
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if ((desc != IORES_DESC_NONE) && (desc != p->desc)) continue; |
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if (p->start > end) { p = NULL; break; } |
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if ((p->end >= start) && (p->start < end)) |
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break; } |
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|
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read_unlock(&resource_lock); if (!p) return -1; /* copy data */ |
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if (res->start < p->start) res->start = p->start; if (res->end > p->end) res->end = p->end; |
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res->flags = p->flags; res->desc = p->desc; |
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return 0; } |
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|
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static int __walk_iomem_res_desc(struct resource *res, unsigned long desc, bool first_level_children_only, |
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void *arg, int (*func)(struct resource *, void *)) |
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{ u64 orig_end = res->end; int ret = -1; while ((res->start < res->end) && !find_next_iomem_res(res, desc, first_level_children_only)) { |
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ret = (*func)(res, arg); |
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if (ret) break; res->start = res->end + 1; res->end = orig_end; } return ret; } |
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/* |
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* Walks through iomem resources and calls func() with matching resource * 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 * * 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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{ struct resource res; |
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res.start = start; res.end = end; res.flags = flags; |
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|
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return __walk_iomem_res_desc(&res, 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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{ struct resource res; |
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res.start = start; res.end = end; |
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res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
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return __walk_iomem_res_desc(&res, 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 *)) { struct resource res; res.start = start; res.end = end; res.flags = IORESOURCE_MEM | IORESOURCE_BUSY; return __walk_iomem_res_desc(&res, IORES_DESC_NONE, true, |
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arg, func); |
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} #if !defined(CONFIG_ARCH_HAS_WALK_MEMORY) /* |
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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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*/ int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages, void *arg, int (*func)(unsigned long, unsigned long, void *)) |
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{ struct resource res; |
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unsigned long pfn, end_pfn; |
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u64 orig_end; int ret = -1; |
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|
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res.start = (u64) start_pfn << PAGE_SHIFT; res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1; |
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res.flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
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orig_end = res.end; |
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while ((res.start < res.end) && |
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(find_next_iomem_res(&res, IORES_DESC_NONE, true) >= 0)) { |
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pfn = (res.start + PAGE_SIZE - 1) >> PAGE_SHIFT; end_pfn = (res.end + 1) >> PAGE_SHIFT; if (end_pfn > pfn) |
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ret = (*func)(pfn, end_pfn - pfn, arg); |
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if (ret) break; res.start = res.end + 1; res.end = orig_end; } return ret; } |
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#endif |
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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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resource_size_t end = start + size - 1; int type = 0; int other = 0; struct resource *p; |
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read_lock(&resource_lock); for (p = iomem_resource.child; p ; p = p->sibling) { |
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bool is_type = (((p->flags & flags) == flags) && ((desc == IORES_DESC_NONE) || (desc == p->desc))); |
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if (start >= p->start && start <= p->end) is_type ? type++ : other++; if (end >= p->start && end <= p->end) is_type ? type++ : other++; if (p->start >= start && p->end <= end) is_type ? type++ : other++; |
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} read_unlock(&resource_lock); |
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if (other == 0) return type ? REGION_INTERSECTS : REGION_DISJOINT; if (type) return REGION_MIXED; return REGION_DISJOINT; |
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} |
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EXPORT_SYMBOL_GPL(region_intersects); |
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|
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void __weak arch_remove_reservations(struct resource *avail) { } |
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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... |
548 549 550 551 552 553 554 555 |
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 |
556 |
/* |
23c570a67 resource: ability... |
557 558 |
* Find empty slot in the resource tree with the given range and * alignment constraints |
1da177e4c Linux-2.6.12-rc2 |
559 |
*/ |
23c570a67 resource: ability... |
560 561 562 563 |
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 |
564 565 |
{ struct resource *this = root->child; |
a1862e310 resources: handle... |
566 |
struct resource tmp = *new, avail, alloc; |
1da177e4c Linux-2.6.12-rc2 |
567 |
|
0e2c8b8f5 resources: fix ca... |
568 |
tmp.start = root->start; |
1da177e4c Linux-2.6.12-rc2 |
569 |
/* |
c0f5ac542 Revert "resources... |
570 571 |
* 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 |
572 |
*/ |
23c570a67 resource: ability... |
573 574 |
if (this && this->start == root->start) { tmp.start = (this == old) ? old->start : this->end + 1; |
1da177e4c Linux-2.6.12-rc2 |
575 576 |
this = this->sibling; } |
c0f5ac542 Revert "resources... |
577 |
for(;;) { |
1da177e4c Linux-2.6.12-rc2 |
578 |
if (this) |
23c570a67 resource: ability... |
579 |
tmp.end = (this == old) ? this->end : this->start - 1; |
1da177e4c Linux-2.6.12-rc2 |
580 |
else |
0e2c8b8f5 resources: fix ca... |
581 |
tmp.end = root->end; |
5d6b1fa30 resources: factor... |
582 |
|
47ea91b40 Resource: fix wro... |
583 584 |
if (tmp.end < tmp.start) goto next; |
23c570a67 resource: ability... |
585 |
resource_clip(&tmp, constraint->min, constraint->max); |
fcb119183 resources: add ar... |
586 |
arch_remove_reservations(&tmp); |
a9cea0174 resources: add a ... |
587 |
|
a1862e310 resources: handle... |
588 |
/* Check for overflow after ALIGN() */ |
23c570a67 resource: ability... |
589 |
avail.start = ALIGN(tmp.start, constraint->align); |
a1862e310 resources: handle... |
590 |
avail.end = tmp.end; |
5edb93b89 resource: Add res... |
591 |
avail.flags = new->flags & ~IORESOURCE_UNSET; |
a1862e310 resources: handle... |
592 |
if (avail.start >= tmp.start) { |
5edb93b89 resource: Add res... |
593 |
alloc.flags = avail.flags; |
23c570a67 resource: ability... |
594 595 |
alloc.start = constraint->alignf(constraint->alignf_data, &avail, size, constraint->align); |
a1862e310 resources: handle... |
596 |
alloc.end = alloc.start + size - 1; |
60bb83b81 resource: fix int... |
597 598 |
if (alloc.start <= alloc.end && resource_contains(&avail, &alloc)) { |
a1862e310 resources: handle... |
599 600 601 602 |
new->start = alloc.start; new->end = alloc.end; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
603 |
} |
47ea91b40 Resource: fix wro... |
604 605 |
next: if (!this || this->end == root->end) |
1da177e4c Linux-2.6.12-rc2 |
606 |
break; |
47ea91b40 Resource: fix wro... |
607 |
|
23c570a67 resource: ability... |
608 609 |
if (this != old) tmp.start = this->end + 1; |
1da177e4c Linux-2.6.12-rc2 |
610 611 612 613 |
this = this->sibling; } return -EBUSY; } |
23c570a67 resource: ability... |
614 615 616 617 618 619 620 621 622 |
/* * 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... |
623 |
/** |
23c570a67 resource: ability... |
624 625 626 627 628 629 630 631 632 |
* 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... |
633 |
static int reallocate_resource(struct resource *root, struct resource *old, |
23c570a67 resource: ability... |
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 |
resource_size_t newsize, struct resource_constraint *constraint) { 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... |
661 |
__release_resource(old, true); |
23c570a67 resource: ability... |
662 663 664 665 666 667 668 669 670 671 672 673 674 |
*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... |
675 676 677 |
* @root: root resource descriptor * @new: resource descriptor desired by caller * @size: requested resource region size |
ee5e5683d kernel/resource.c... |
678 679 |
* @min: minimum boundary to allocate * @max: maximum boundary to allocate |
e1ca66d1b [PATCH] kernel-do... |
680 681 682 |
* @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 |
683 684 |
*/ int allocate_resource(struct resource *root, struct resource *new, |
d75fc8bbc [PATCH] 64bit res... |
685 686 |
resource_size_t size, resource_size_t min, resource_size_t max, resource_size_t align, |
b26b2d494 resource/PCI: ali... |
687 |
resource_size_t (*alignf)(void *, |
3b7a17fcd resource/PCI: mar... |
688 |
const struct resource *, |
b26b2d494 resource/PCI: ali... |
689 690 |
resource_size_t, resource_size_t), |
1da177e4c Linux-2.6.12-rc2 |
691 692 693 |
void *alignf_data) { int err; |
23c570a67 resource: ability... |
694 |
struct resource_constraint constraint; |
1da177e4c Linux-2.6.12-rc2 |
695 |
|
a9cea0174 resources: add a ... |
696 697 |
if (!alignf) alignf = simple_align_resource; |
23c570a67 resource: ability... |
698 699 700 701 702 703 704 705 706 707 708 |
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 |
709 |
write_lock(&resource_lock); |
23c570a67 resource: ability... |
710 |
err = find_resource(root, new, size, &constraint); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 714 715 716 717 |
if (err >= 0 && __request_resource(root, new)) err = -EBUSY; write_unlock(&resource_lock); return err; } EXPORT_SYMBOL(allocate_resource); |
1c388919d resources: Add lo... |
718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 |
/** * 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... |
738 739 740 |
/* * 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 |
741 |
*/ |
bef69ea0d Resource handling... |
742 |
static struct resource * __insert_resource(struct resource *parent, struct resource *new) |
1da177e4c Linux-2.6.12-rc2 |
743 |
{ |
1da177e4c Linux-2.6.12-rc2 |
744 |
struct resource *first, *next; |
d33b6fba2 Resources: insert... |
745 |
for (;; parent = first) { |
d33b6fba2 Resources: insert... |
746 747 |
first = __request_resource(parent, new); if (!first) |
bef69ea0d Resource handling... |
748 |
return first; |
d33b6fba2 Resources: insert... |
749 |
|
d33b6fba2 Resources: insert... |
750 |
if (first == parent) |
bef69ea0d Resource handling... |
751 |
return first; |
5de1cb2d0 kernel/resource.c... |
752 753 |
if (WARN_ON(first == new)) /* duplicated insertion */ return first; |
d33b6fba2 Resources: insert... |
754 755 756 757 758 |
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 |
759 760 761 762 763 |
} for (next = first; ; next = next->sibling) { /* Partial overlap? Bad, and unfixable */ if (next->start < new->start || next->end > new->end) |
bef69ea0d Resource handling... |
764 |
return next; |
1da177e4c Linux-2.6.12-rc2 |
765 766 767 768 769 |
if (!next->sibling) break; if (next->sibling->start > new->end) break; } |
1da177e4c Linux-2.6.12-rc2 |
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 |
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... |
786 787 |
return NULL; } |
1da177e4c Linux-2.6.12-rc2 |
788 |
|
bef69ea0d Resource handling... |
789 |
/** |
66f1207bc resources: add in... |
790 |
* insert_resource_conflict - Inserts resource in the resource tree |
bef69ea0d Resource handling... |
791 792 793 |
* @parent: parent of the new resource * @new: new resource to insert * |
66f1207bc resources: add in... |
794 |
* Returns 0 on success, conflict resource if the resource can't be inserted. |
bef69ea0d Resource handling... |
795 |
* |
66f1207bc resources: add in... |
796 |
* This function is equivalent to request_resource_conflict when no conflict |
bef69ea0d Resource handling... |
797 798 799 800 |
* 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... |
801 802 803 |
* * This function is intended for producers of resources, such as FW modules * and bus drivers. |
bef69ea0d Resource handling... |
804 |
*/ |
66f1207bc resources: add in... |
805 |
struct resource *insert_resource_conflict(struct resource *parent, struct resource *new) |
bef69ea0d Resource handling... |
806 807 808 809 810 811 |
{ struct resource *conflict; write_lock(&resource_lock); conflict = __insert_resource(parent, new); write_unlock(&resource_lock); |
66f1207bc resources: add in... |
812 813 814 815 816 817 818 819 820 |
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... |
821 822 823 |
* * This function is intended for producers of resources, such as FW modules * and bus drivers. |
66f1207bc resources: add in... |
824 825 826 827 828 829 |
*/ int insert_resource(struct resource *parent, struct resource *new) { struct resource *conflict; conflict = insert_resource_conflict(parent, new); |
bef69ea0d Resource handling... |
830 831 |
return conflict ? -EBUSY : 0; } |
8095d0f22 resource: Export ... |
832 |
EXPORT_SYMBOL_GPL(insert_resource); |
bef69ea0d Resource handling... |
833 834 835 |
/** * insert_resource_expand_to_fit - Insert a resource into the resource tree |
6781f4ae3 kernel/resource.c... |
836 |
* @root: root resource descriptor |
bef69ea0d Resource handling... |
837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 |
* @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 |
866 |
write_unlock(&resource_lock); |
1da177e4c Linux-2.6.12-rc2 |
867 |
} |
ff3cc952d resource: Add rem... |
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 |
/** * 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 ... |
892 |
EXPORT_SYMBOL_GPL(remove_resource); |
ff3cc952d resource: Add rem... |
893 |
|
ae8e3a915 resource: add __a... |
894 895 |
static int __adjust_resource(struct resource *res, resource_size_t start, resource_size_t size) |
1da177e4c Linux-2.6.12-rc2 |
896 897 |
{ struct resource *tmp, *parent = res->parent; |
d75fc8bbc [PATCH] 64bit res... |
898 |
resource_size_t end = start + size - 1; |
1da177e4c Linux-2.6.12-rc2 |
899 |
int result = -EBUSY; |
82ec90eac resources: allow ... |
900 901 |
if (!parent) goto skip; |
1da177e4c Linux-2.6.12-rc2 |
902 903 |
if ((start < parent->start) || (end > parent->end)) goto out; |
1da177e4c Linux-2.6.12-rc2 |
904 905 906 907 908 909 910 911 912 913 |
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 ... |
914 915 916 917 |
skip: for (tmp = res->child; tmp; tmp = tmp->sibling) if ((tmp->start < start) || (tmp->end > end)) goto out; |
1da177e4c Linux-2.6.12-rc2 |
918 919 920 921 922 |
res->start = start; res->end = end; result = 0; out: |
ae8e3a915 resource: add __a... |
923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 |
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, resource_size_t size) { int result; write_lock(&resource_lock); result = __adjust_resource(res, start, size); |
1da177e4c Linux-2.6.12-rc2 |
943 944 945 |
write_unlock(&resource_lock); return result; } |
241057486 kernel/resource.c... |
946 |
EXPORT_SYMBOL(adjust_resource); |
1da177e4c Linux-2.6.12-rc2 |
947 |
|
268364a0f IO resources: add... |
948 949 950 951 952 953 |
static void __init __reserve_region_with_split(struct resource *root, resource_size_t start, resource_size_t end, const char *name) { struct resource *parent = root; struct resource *conflict; |
ebff7d8f2 mem hotunplug: fi... |
954 |
struct resource *res = alloc_resource(GFP_ATOMIC); |
4965f5667 kernel/resource.c... |
955 |
struct resource *next_res = NULL; |
f37e2334b resource: Set typ... |
956 |
int type = resource_type(root); |
268364a0f IO resources: add... |
957 958 959 960 961 962 963 |
if (!res) return; res->name = name; res->start = start; res->end = end; |
f37e2334b resource: Set typ... |
964 |
res->flags = type | IORESOURCE_BUSY; |
43ee493bd resource: Add I/O... |
965 |
res->desc = IORES_DESC_NONE; |
268364a0f IO resources: add... |
966 |
|
4965f5667 kernel/resource.c... |
967 |
while (1) { |
268364a0f IO resources: add... |
968 |
|
4965f5667 kernel/resource.c... |
969 970 971 972 973 974 975 976 |
conflict = __request_resource(parent, res); if (!conflict) { if (!next_res) break; res = next_res; next_res = NULL; continue; } |
268364a0f IO resources: add... |
977 |
|
4965f5667 kernel/resource.c... |
978 979 980 |
/* conflict covered whole area */ if (conflict->start <= res->start && conflict->end >= res->end) { |
ebff7d8f2 mem hotunplug: fi... |
981 |
free_resource(res); |
4965f5667 kernel/resource.c... |
982 983 984 985 986 987 988 989 990 |
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... |
991 |
next_res = alloc_resource(GFP_ATOMIC); |
4965f5667 kernel/resource.c... |
992 |
if (!next_res) { |
ebff7d8f2 mem hotunplug: fi... |
993 |
free_resource(res); |
4965f5667 kernel/resource.c... |
994 995 996 997 998 |
break; } next_res->name = name; next_res->start = conflict->end + 1; next_res->end = end; |
f37e2334b resource: Set typ... |
999 |
next_res->flags = type | IORESOURCE_BUSY; |
43ee493bd resource: Add I/O... |
1000 |
next_res->desc = IORES_DESC_NONE; |
4965f5667 kernel/resource.c... |
1001 1002 1003 1004 1005 |
} } else { res->start = conflict->end + 1; } } |
268364a0f IO resources: add... |
1006 1007 |
} |
bea921124 kernel/resource: ... |
1008 |
void __init reserve_region_with_split(struct resource *root, |
268364a0f IO resources: add... |
1009 1010 1011 |
resource_size_t start, resource_size_t end, const char *name) { |
65fed8f6f resource: make su... |
1012 |
int abort = 0; |
268364a0f IO resources: add... |
1013 |
write_lock(&resource_lock); |
65fed8f6f resource: make su... |
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 |
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... |
1035 1036 |
write_unlock(&resource_lock); } |
884525655 PCI: clean up res... |
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 |
/** * 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... |
1047 |
return resource_size(res); |
884525655 PCI: clean up res... |
1048 1049 1050 1051 1052 1053 |
case IORESOURCE_STARTALIGN: return res->start; default: return 0; } } |
1da177e4c Linux-2.6.12-rc2 |
1054 1055 1056 1057 1058 1059 |
/* * 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... |
1060 |
* request_region creates a new busy region. |
1da177e4c Linux-2.6.12-rc2 |
1061 |
* |
e1ca66d1b [PATCH] kernel-do... |
1062 1063 |
* release_region releases a matching busy region. */ |
8b6d043b7 resource: shared ... |
1064 |
static DECLARE_WAIT_QUEUE_HEAD(muxed_resource_wait); |
e1ca66d1b [PATCH] kernel-do... |
1065 1066 1067 1068 1069 1070 |
/** * __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... |
1071 |
* @flags: IO resource flags |
1da177e4c Linux-2.6.12-rc2 |
1072 |
*/ |
d75fc8bbc [PATCH] 64bit res... |
1073 1074 |
struct resource * __request_region(struct resource *parent, resource_size_t start, resource_size_t n, |
e8de1481f resource: allow M... |
1075 |
const char *name, int flags) |
1da177e4c Linux-2.6.12-rc2 |
1076 |
{ |
8b6d043b7 resource: shared ... |
1077 |
DECLARE_WAITQUEUE(wait, current); |
ebff7d8f2 mem hotunplug: fi... |
1078 |
struct resource *res = alloc_resource(GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1079 |
|
c26ec88ea resources: tidy _... |
1080 1081 1082 1083 1084 1085 |
if (!res) return NULL; res->name = name; res->start = start; res->end = start + n - 1; |
c26ec88ea resources: tidy _... |
1086 1087 1088 1089 1090 |
write_lock(&resource_lock); for (;;) { struct resource *conflict; |
4e0d8f7ef resource: Change ... |
1091 1092 1093 |
res->flags = resource_type(parent) | resource_ext_type(parent); res->flags |= IORESOURCE_BUSY | flags; res->desc = parent->desc; |
c26ec88ea resources: tidy _... |
1094 1095 |
conflict = __request_resource(parent, res); if (!conflict) |
1da177e4c Linux-2.6.12-rc2 |
1096 |
break; |
c26ec88ea resources: tidy _... |
1097 |
if (conflict != parent) { |
59ceeaaf3 kernel/resource.c... |
1098 1099 |
if (!(conflict->flags & IORESOURCE_BUSY)) { parent = conflict; |
c26ec88ea resources: tidy _... |
1100 |
continue; |
59ceeaaf3 kernel/resource.c... |
1101 |
} |
1da177e4c Linux-2.6.12-rc2 |
1102 |
} |
8b6d043b7 resource: shared ... |
1103 1104 1105 1106 1107 1108 1109 1110 1111 |
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 _... |
1112 |
/* Uhhuh, that didn't work out.. */ |
ebff7d8f2 mem hotunplug: fi... |
1113 |
free_resource(res); |
c26ec88ea resources: tidy _... |
1114 1115 |
res = NULL; break; |
1da177e4c Linux-2.6.12-rc2 |
1116 |
} |
c26ec88ea resources: tidy _... |
1117 |
write_unlock(&resource_lock); |
1da177e4c Linux-2.6.12-rc2 |
1118 1119 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1120 |
EXPORT_SYMBOL(__request_region); |
e1ca66d1b [PATCH] kernel-do... |
1121 |
/** |
e1ca66d1b [PATCH] kernel-do... |
1122 1123 1124 1125 1126 1127 1128 |
* __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... |
1129 1130 |
void __release_region(struct resource *parent, resource_size_t start, resource_size_t n) |
1da177e4c Linux-2.6.12-rc2 |
1131 1132 |
{ struct resource **p; |
d75fc8bbc [PATCH] 64bit res... |
1133 |
resource_size_t end; |
1da177e4c Linux-2.6.12-rc2 |
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 |
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 ... |
1154 1155 |
if (res->flags & IORESOURCE_MUXED) wake_up(&muxed_resource_wait); |
ebff7d8f2 mem hotunplug: fi... |
1156 |
free_resource(res); |
1da177e4c Linux-2.6.12-rc2 |
1157 1158 1159 1160 1161 1162 |
return; } p = &res->sibling; } write_unlock(&resource_lock); |
685143ac1 [PATCH] 64bit res... |
1163 1164 1165 1166 |
printk(KERN_WARNING "Trying to free nonexistent resource " "<%016llx-%016llx> ", (unsigned long long)start, (unsigned long long)end); |
1da177e4c Linux-2.6.12-rc2 |
1167 |
} |
1da177e4c Linux-2.6.12-rc2 |
1168 |
EXPORT_SYMBOL(__release_region); |
825f787bb resource: add rel... |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 |
#ifdef CONFIG_MEMORY_HOTREMOVE /** * release_mem_region_adjustable - release a previously reserved memory region * @parent: parent resource descriptor * @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. */ int release_mem_region_adjustable(struct resource *parent, resource_size_t start, resource_size_t size) { struct resource **p; struct resource *res; struct resource *new_res; resource_size_t end; int ret = -EINVAL; end = start + size - 1; if ((start < parent->start) || (end > parent->end)) return ret; |
ebff7d8f2 mem hotunplug: fi... |
1202 1203 |
/* The alloc_resource() result gets checked later */ new_res = alloc_resource(GFP_KERNEL); |
825f787bb resource: add rel... |
1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 |
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; } 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... |
1230 |
free_resource(res); |
825f787bb resource: add rel... |
1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 |
ret = 0; } else if (res->start == start && res->end != end) { /* adjust the start */ ret = __adjust_resource(res, end + 1, res->end - end); } else if (res->start != start && res->end == end) { /* adjust the end */ ret = __adjust_resource(res, res->start, start - res->start); } else { /* split into two entries */ if (!new_res) { ret = -ENOMEM; break; } 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... |
1250 |
new_res->desc = res->desc; |
825f787bb resource: add rel... |
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 |
new_res->parent = res->parent; new_res->sibling = res->sibling; new_res->child = NULL; ret = __adjust_resource(res, res->start, start - res->start); if (ret) break; res->sibling = new_res; new_res = NULL; } break; } write_unlock(&resource_lock); |
ebff7d8f2 mem hotunplug: fi... |
1267 |
free_resource(new_res); |
825f787bb resource: add rel... |
1268 1269 1270 |
return ret; } #endif /* CONFIG_MEMORY_HOTREMOVE */ |
1da177e4c Linux-2.6.12-rc2 |
1271 |
/* |
9ac7849e3 devres: device re... |
1272 1273 |
* Managed region resource */ |
8d38821cb resources: Add de... |
1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 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 |
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... |
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
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; } struct resource * __devm_request_region(struct device *dev, struct resource *parent, resource_size_t start, resource_size_t n, const char *name) { 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... |
1380 |
res = __request_region(parent, start, n, name, 0); |
9ac7849e3 devres: device re... |
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 |
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... |
1402 |
* Reserve I/O ports or memory based on "reserve=" kernel parameter. |
1da177e4c Linux-2.6.12-rc2 |
1403 1404 1405 1406 1407 1408 1409 1410 |
*/ #define MAXRESERVE 4 static int __init reserve_setup(char *str) { static int reserved; static struct resource reserve[MAXRESERVE]; for (;;) { |
8bc1ad7dd kernel/resource.c... |
1411 |
unsigned int io_start, io_num; |
1da177e4c Linux-2.6.12-rc2 |
1412 |
int x = reserved; |
ffd2e8df8 resource: Set typ... |
1413 |
struct resource *parent; |
1da177e4c Linux-2.6.12-rc2 |
1414 |
|
ffd2e8df8 resource: Set typ... |
1415 |
if (get_option(&str, &io_start) != 2) |
1da177e4c Linux-2.6.12-rc2 |
1416 |
break; |
ffd2e8df8 resource: Set typ... |
1417 |
if (get_option(&str, &io_num) == 0) |
1da177e4c Linux-2.6.12-rc2 |
1418 1419 1420 |
break; if (x < MAXRESERVE) { struct resource *res = reserve + x; |
ffd2e8df8 resource: Set typ... |
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
/* * 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 |
1433 1434 1435 |
res->name = "reserved"; res->start = io_start; res->end = io_start + io_num - 1; |
ffd2e8df8 resource: Set typ... |
1436 |
res->flags |= IORESOURCE_BUSY; |
43ee493bd resource: Add I/O... |
1437 |
res->desc = IORES_DESC_NONE; |
1da177e4c Linux-2.6.12-rc2 |
1438 |
res->child = NULL; |
ffd2e8df8 resource: Set typ... |
1439 |
if (request_resource(parent, res) == 0) |
1da177e4c Linux-2.6.12-rc2 |
1440 1441 1442 1443 1444 |
reserved = x+1; } } return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1445 |
__setup("reserve=", reserve_setup); |
379daf629 IO resources, x86... |
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 |
/* * 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... |
1467 1468 |
if (PFN_DOWN(p->start) <= PFN_DOWN(addr) && PFN_DOWN(p->end) >= PFN_DOWN(addr + size - 1)) |
379daf629 IO resources, x86... |
1469 |
continue; |
3ac52669c resources: skip s... |
1470 1471 1472 1473 1474 1475 1476 1477 |
/* * 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... |
1478 1479 |
printk(KERN_WARNING "resource sanity check: requesting [mem %#010llx-%#010llx], which spans more than %s %pR ", |
13eb83754 IO resources, x86... |
1480 1481 |
(unsigned long long)addr, (unsigned long long)(addr + size - 1), |
e4c729664 resources: Clarif... |
1482 |
p->name, p); |
379daf629 IO resources, x86... |
1483 1484 1485 1486 1487 1488 1489 |
err = -1; break; } read_unlock(&resource_lock); return err; } |
e8de1481f resource: allow M... |
1490 1491 1492 1493 1494 1495 1496 1497 1498 |
#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: ... |
1499 |
* returns true if reserved, false if not reserved. |
e8de1481f resource: allow M... |
1500 |
*/ |
9825b451f kernel/resource: ... |
1501 |
bool iomem_is_exclusive(u64 addr) |
e8de1481f resource: allow M... |
1502 1503 |
{ struct resource *p = &iomem_resource; |
9825b451f kernel/resource: ... |
1504 |
bool err = false; |
e8de1481f resource: allow M... |
1505 1506 1507 1508 |
loff_t l; int size = PAGE_SIZE; if (!strict_iomem_checks) |
9825b451f kernel/resource: ... |
1509 |
return false; |
e8de1481f resource: allow M... |
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 |
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... |
1523 1524 1525 1526 1527 1528 1529 1530 1531 |
/* * 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: ... |
1532 |
err = true; |
e8de1481f resource: allow M... |
1533 1534 1535 1536 1537 1538 1539 |
break; } } read_unlock(&resource_lock); return err; } |
90e978206 resources: Move s... |
1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 |
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); |
e8de1481f resource: allow M... |
1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 |
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); |