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![Bjorn Helgaas](/assets/img/avatar_default.png)
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>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* system.c - a driver for reserving pnp system resources
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*
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* Some code is based on pnpbios_core.c
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* Copyright 2002 Adam Belay <ambx1@neo.rr.com>
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* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
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* Bjorn Helgaas <bjorn.helgaas@hp.com>
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*/
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#include <linux/pnp.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/ioport.h>
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static const struct pnp_device_id pnp_dev_table[] = {
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/* General ID for reserving resources */
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{"PNP0c02", 0},
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/* memory controller */
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{"PNP0c01", 0},
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{"", 0}
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};
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static void reserve_range(struct pnp_dev *dev, resource_size_t start,
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resource_size_t end, int port)
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{
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char *regionid;
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const char *pnpid = dev->dev.bus_id;
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struct resource *res;
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regionid = kmalloc(16, GFP_KERNEL);
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if (!regionid)
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return;
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snprintf(regionid, 16, "pnp %s", pnpid);
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if (port)
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res = request_region(start, end - start + 1, regionid);
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else
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res = request_mem_region(start, end - start + 1, regionid);
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if (res)
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res->flags &= ~IORESOURCE_BUSY;
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else
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kfree(regionid);
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/*
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* Failures at this point are usually harmless. pci quirks for
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* example do reserve stuff they know about too, so we may well
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* have double reservations.
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*/
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dev_info(&dev->dev, "%s range 0x%llx-0x%llx %s reserved\n",
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port ? "ioport" : "iomem",
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(unsigned long long) start, (unsigned long long) end,
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res ? "has been" : "could not be");
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}
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static void reserve_resources_of_dev(struct pnp_dev *dev)
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{
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struct resource *res;
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int i;
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for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
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if (res->flags & IORESOURCE_DISABLED)
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continue;
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if (res->start == 0)
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continue; /* disabled */
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if (res->start < 0x100)
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/*
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* Below 0x100 is only standard PC hardware
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* (pics, kbd, timer, dma, ...)
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* We should not get resource conflicts there,
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* and the kernel reserves these anyway
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* (see arch/i386/kernel/setup.c).
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* So, do nothing
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*/
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continue;
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if (res->end < res->start)
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continue; /* invalid */
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reserve_range(dev, res->start, res->end, 1);
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}
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for (i = 0; (res = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
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if (res->flags & IORESOURCE_DISABLED)
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continue;
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reserve_range(dev, res->start, res->end, 0);
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}
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}
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static int system_pnp_probe(struct pnp_dev *dev,
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const struct pnp_device_id *dev_id)
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{
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reserve_resources_of_dev(dev);
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return 0;
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}
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static struct pnp_driver system_pnp_driver = {
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.name = "system",
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.id_table = pnp_dev_table,
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.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
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.probe = system_pnp_probe,
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};
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static int __init pnp_system_init(void)
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{
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return pnp_register_driver(&system_pnp_driver);
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}
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/**
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* Reserve motherboard resources after PCI claim BARs,
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* but before PCI assign resources for uninitialized PCI devices
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*/
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fs_initcall(pnp_system_init);
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