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47e9249a6c
Fix a documentation build warning caused by the comment not being in kernel-doc format: system.c:110: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst * Reserve motherboard resources after PCI claim BARs, Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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, struct resource *r, int port)
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{
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char *regionid;
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const char *pnpid = dev_name(&dev->dev);
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resource_size_t start = r->start, end = r->end;
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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, "%pR %s reserved\n", r,
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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, 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, 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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