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aee3ad815d
PNP used to have a fixed-size pnp_resource_table for tracking the resources used by a device. This table often overflowed, so we've had to increase the table size, which wastes memory because most devices have very few resources. This patch replaces the table with a linked list of resources where the entries are allocated on demand. This removes messages like these: pnpacpi: exceeded the max number of IO resources 00:01: too many I/O port resources References: http://bugzilla.kernel.org/show_bug.cgi?id=9535 http://bugzilla.kernel.org/show_bug.cgi?id=9740 http://lkml.org/lkml/2007/11/30/110 This patch also changes the way PNP uses the IORESOURCE_UNSET, IORESOURCE_AUTO, and IORESOURCE_DISABLED flags. Prior to this patch, the pnp_resource_table entries used the flags like this: IORESOURCE_UNSET This table entry is unused and available for use. When this flag is set, we shouldn't look at anything else in the resource structure. This flag is set when a resource table entry is initialized. IORESOURCE_AUTO This resource was assigned automatically by pnp_assign_{io,mem,etc}(). This flag is set when a resource table entry is initialized and cleared whenever we discover a resource setting by reading an ISAPNP config register, parsing a PNPBIOS resource data stream, parsing an ACPI _CRS list, or interpreting a sysfs "set" command. Resources marked IORESOURCE_AUTO are reinitialized and marked as IORESOURCE_UNSET by pnp_clean_resource_table() in these cases: - before we attempt to assign resources automatically, - if we fail to assign resources automatically, - after disabling a device IORESOURCE_DISABLED Set by pnp_assign_{io,mem,etc}() when automatic assignment fails. Also set by PNPBIOS and PNPACPI for: - invalid IRQs or GSI registration failures - invalid DMA channels - I/O ports above 0x10000 - mem ranges with negative length After this patch, there is no pnp_resource_table, and the resource list entries use the flags like this: IORESOURCE_UNSET This flag is no longer used in PNP. Instead of keeping IORESOURCE_UNSET entries in the resource list, we remove entries from the list and free them. IORESOURCE_AUTO No change in meaning: it still means the resource was assigned automatically by pnp_assign_{port,mem,etc}(), but these functions now set the bit explicitly. We still "clean" a device's resource list in the same places, but rather than reinitializing IORESOURCE_AUTO entries, we just remove them from the list. Note that IORESOURCE_AUTO entries are always at the end of the list, so removing them doesn't reorder other list entries. This is because non-IORESOURCE_AUTO entries are added by the ISAPNP, PNPBIOS, or PNPACPI "get resources" methods and by the sysfs "set" command. In each of these cases, we completely free the resource list first. IORESOURCE_DISABLED In addition to the cases where we used to set this flag, ISAPNP now adds an IORESOURCE_DISABLED resource when it reads a configuration register with a "disabled" value. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Andi Kleen <ak@linux.intel.com>
226 lines
4.7 KiB
C
226 lines
4.7 KiB
C
/*
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* core.c - contains all core device and protocol registration functions
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*
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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*/
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#include <linux/pnp.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/dma-mapping.h>
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#include "base.h"
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static LIST_HEAD(pnp_protocols);
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LIST_HEAD(pnp_global);
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DEFINE_SPINLOCK(pnp_lock);
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/*
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* ACPI or PNPBIOS should tell us about all platform devices, so we can
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* skip some blind probes. ISAPNP typically enumerates only plug-in ISA
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* devices, not built-in things like COM ports.
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*/
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int pnp_platform_devices;
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EXPORT_SYMBOL(pnp_platform_devices);
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void *pnp_alloc(long size)
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{
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void *result;
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result = kzalloc(size, GFP_KERNEL);
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if (!result) {
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printk(KERN_ERR "pnp: Out of Memory\n");
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return NULL;
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}
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return result;
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}
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/**
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* pnp_protocol_register - adds a pnp protocol to the pnp layer
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* @protocol: pointer to the corresponding pnp_protocol structure
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*
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* Ex protocols: ISAPNP, PNPBIOS, etc
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*/
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int pnp_register_protocol(struct pnp_protocol *protocol)
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{
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int nodenum;
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struct list_head *pos;
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INIT_LIST_HEAD(&protocol->devices);
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INIT_LIST_HEAD(&protocol->cards);
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nodenum = 0;
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spin_lock(&pnp_lock);
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/* assign the lowest unused number */
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list_for_each(pos, &pnp_protocols) {
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struct pnp_protocol *cur = to_pnp_protocol(pos);
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if (cur->number == nodenum) {
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pos = &pnp_protocols;
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nodenum++;
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}
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}
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list_add_tail(&protocol->protocol_list, &pnp_protocols);
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spin_unlock(&pnp_lock);
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protocol->number = nodenum;
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sprintf(protocol->dev.bus_id, "pnp%d", nodenum);
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return device_register(&protocol->dev);
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}
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/**
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* pnp_protocol_unregister - removes a pnp protocol from the pnp layer
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* @protocol: pointer to the corresponding pnp_protocol structure
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*/
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void pnp_unregister_protocol(struct pnp_protocol *protocol)
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{
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spin_lock(&pnp_lock);
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list_del(&protocol->protocol_list);
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spin_unlock(&pnp_lock);
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device_unregister(&protocol->dev);
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}
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static void pnp_free_ids(struct pnp_dev *dev)
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{
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struct pnp_id *id;
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struct pnp_id *next;
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id = dev->id;
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while (id) {
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next = id->next;
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kfree(id);
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id = next;
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}
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}
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void pnp_free_resource(struct pnp_resource *pnp_res)
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{
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list_del(&pnp_res->list);
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kfree(pnp_res);
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}
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void pnp_free_resources(struct pnp_dev *dev)
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{
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struct pnp_resource *pnp_res, *tmp;
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list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
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pnp_free_resource(pnp_res);
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}
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}
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static void pnp_release_device(struct device *dmdev)
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{
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struct pnp_dev *dev = to_pnp_dev(dmdev);
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pnp_free_option(dev->independent);
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pnp_free_option(dev->dependent);
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pnp_free_ids(dev);
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pnp_free_resources(dev);
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kfree(dev);
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}
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struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id, char *pnpid)
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{
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struct pnp_dev *dev;
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struct pnp_id *dev_id;
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dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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INIT_LIST_HEAD(&dev->resources);
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dev->protocol = protocol;
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dev->number = id;
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dev->dma_mask = DMA_24BIT_MASK;
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dev->dev.parent = &dev->protocol->dev;
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dev->dev.bus = &pnp_bus_type;
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dev->dev.dma_mask = &dev->dma_mask;
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dev->dev.coherent_dma_mask = dev->dma_mask;
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dev->dev.release = &pnp_release_device;
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sprintf(dev->dev.bus_id, "%02x:%02x", dev->protocol->number,
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dev->number);
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dev_id = pnp_add_id(dev, pnpid);
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if (!dev_id) {
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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int __pnp_add_device(struct pnp_dev *dev)
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{
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int ret;
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pnp_fixup_device(dev);
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dev->status = PNP_READY;
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spin_lock(&pnp_lock);
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list_add_tail(&dev->global_list, &pnp_global);
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list_add_tail(&dev->protocol_list, &dev->protocol->devices);
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spin_unlock(&pnp_lock);
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ret = device_register(&dev->dev);
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if (ret)
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return ret;
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pnp_interface_attach_device(dev);
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return 0;
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}
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/*
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* pnp_add_device - adds a pnp device to the pnp layer
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* @dev: pointer to dev to add
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*
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* adds to driver model, name database, fixups, interface, etc.
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*/
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int pnp_add_device(struct pnp_dev *dev)
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{
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int ret;
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if (dev->card)
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return -EINVAL;
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ret = __pnp_add_device(dev);
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if (ret)
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return ret;
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#ifdef CONFIG_PNP_DEBUG
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{
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struct pnp_id *id;
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dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs",
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dev->protocol->name);
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for (id = dev->id; id; id = id->next)
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printk(" %s", id->id);
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printk(" (%s)\n", dev->active ? "active" : "disabled");
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}
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#endif
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return 0;
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}
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void __pnp_remove_device(struct pnp_dev *dev)
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{
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spin_lock(&pnp_lock);
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list_del(&dev->global_list);
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list_del(&dev->protocol_list);
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spin_unlock(&pnp_lock);
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device_unregister(&dev->dev);
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}
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static int __init pnp_init(void)
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{
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printk(KERN_INFO "Linux Plug and Play Support v0.97 (c) Adam Belay\n");
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return bus_register(&pnp_bus_type);
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}
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subsys_initcall(pnp_init);
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