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![Jakub Sitnicki](/assets/img/avatar_default.png)
PNP core is the last user of the __check_region() which has been deprecated for almost 12 years (since v2.5.54). Replace it with a combo of __request_region() followed by __release_region(). pnp_check_port() and pnp_check_mem() remain racy after this change. Signed-off-by: Jakub Sitnicki <jsitnicki@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
753 lines
17 KiB
C
753 lines
17 KiB
C
/*
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* resource.c - Contains functions for registering and analyzing resource information
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*
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* based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
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* Copyright 2003 Adam Belay <ambx1@neo.rr.com>
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* Copyright (C) 2008 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/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <asm/io.h>
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#include <asm/dma.h>
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#include <asm/irq.h>
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#include <linux/pci.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/pnp.h>
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#include "base.h"
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static int pnp_reserve_irq[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some IRQ */
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static int pnp_reserve_dma[8] = {[0 ... 7] = -1 }; /* reserve (don't use) some DMA */
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static int pnp_reserve_io[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some I/O region */
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static int pnp_reserve_mem[16] = {[0 ... 15] = -1 }; /* reserve (don't use) some memory region */
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/*
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* option registration
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*/
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static struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
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unsigned int option_flags)
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{
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struct pnp_option *option;
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option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
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if (!option)
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return NULL;
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option->flags = option_flags;
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option->type = type;
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list_add_tail(&option->list, &dev->options);
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return option;
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}
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int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
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pnp_irq_mask_t *map, unsigned char flags)
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{
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struct pnp_option *option;
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struct pnp_irq *irq;
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option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
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if (!option)
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return -ENOMEM;
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irq = &option->u.irq;
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irq->map = *map;
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irq->flags = flags;
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#ifdef CONFIG_PCI
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{
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int i;
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for (i = 0; i < 16; i++)
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if (test_bit(i, irq->map.bits))
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pcibios_penalize_isa_irq(i, 0);
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}
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#endif
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dbg_pnp_show_option(dev, option);
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return 0;
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}
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int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
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unsigned char map, unsigned char flags)
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{
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struct pnp_option *option;
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struct pnp_dma *dma;
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option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
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if (!option)
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return -ENOMEM;
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dma = &option->u.dma;
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dma->map = map;
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dma->flags = flags;
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dbg_pnp_show_option(dev, option);
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return 0;
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}
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int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
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resource_size_t min, resource_size_t max,
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resource_size_t align, resource_size_t size,
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unsigned char flags)
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{
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struct pnp_option *option;
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struct pnp_port *port;
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option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
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if (!option)
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return -ENOMEM;
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port = &option->u.port;
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port->min = min;
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port->max = max;
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port->align = align;
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port->size = size;
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port->flags = flags;
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dbg_pnp_show_option(dev, option);
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return 0;
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}
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int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
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resource_size_t min, resource_size_t max,
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resource_size_t align, resource_size_t size,
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unsigned char flags)
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{
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struct pnp_option *option;
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struct pnp_mem *mem;
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option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
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if (!option)
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return -ENOMEM;
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mem = &option->u.mem;
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mem->min = min;
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mem->max = max;
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mem->align = align;
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mem->size = size;
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mem->flags = flags;
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dbg_pnp_show_option(dev, option);
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return 0;
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}
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void pnp_free_options(struct pnp_dev *dev)
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{
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struct pnp_option *option, *tmp;
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list_for_each_entry_safe(option, tmp, &dev->options, list) {
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list_del(&option->list);
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kfree(option);
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}
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}
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/*
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* resource validity checking
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*/
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#define length(start, end) (*(end) - *(start) + 1)
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/* Two ranges conflict if one doesn't end before the other starts */
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#define ranged_conflict(starta, enda, startb, endb) \
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!((*(enda) < *(startb)) || (*(endb) < *(starta)))
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#define cannot_compare(flags) \
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((flags) & IORESOURCE_DISABLED)
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int pnp_check_port(struct pnp_dev *dev, struct resource *res)
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{
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int i;
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struct pnp_dev *tdev;
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struct resource *tres;
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resource_size_t *port, *end, *tport, *tend;
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port = &res->start;
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end = &res->end;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(res->flags))
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return 1;
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if (!dev->active) {
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if (!request_region(*port, length(port, end), "pnp"))
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return 0;
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release_region(*port, length(port, end));
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}
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/* check if the resource is reserved */
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for (i = 0; i < 8; i++) {
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int rport = pnp_reserve_io[i << 1];
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int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
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if (ranged_conflict(port, end, &rport, &rend))
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return 0;
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}
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/* check for internal conflicts */
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for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
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if (tres != res && tres->flags & IORESOURCE_IO) {
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tport = &tres->start;
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tend = &tres->end;
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if (ranged_conflict(port, end, tport, tend))
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return 0;
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}
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (i = 0;
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(tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
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i++) {
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if (tres->flags & IORESOURCE_IO) {
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if (cannot_compare(tres->flags))
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continue;
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if (tres->flags & IORESOURCE_WINDOW)
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continue;
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tport = &tres->start;
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tend = &tres->end;
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if (ranged_conflict(port, end, tport, tend))
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return 0;
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}
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}
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}
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return 1;
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}
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int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
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{
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int i;
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struct pnp_dev *tdev;
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struct resource *tres;
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resource_size_t *addr, *end, *taddr, *tend;
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addr = &res->start;
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end = &res->end;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(res->flags))
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return 1;
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if (!dev->active) {
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if (!request_mem_region(*addr, length(addr, end), "pnp"))
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return 0;
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release_mem_region(*addr, length(addr, end));
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}
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/* check if the resource is reserved */
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for (i = 0; i < 8; i++) {
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int raddr = pnp_reserve_mem[i << 1];
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int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
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if (ranged_conflict(addr, end, &raddr, &rend))
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return 0;
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}
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/* check for internal conflicts */
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for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
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if (tres != res && tres->flags & IORESOURCE_MEM) {
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taddr = &tres->start;
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tend = &tres->end;
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if (ranged_conflict(addr, end, taddr, tend))
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return 0;
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}
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (i = 0;
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(tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
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i++) {
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if (tres->flags & IORESOURCE_MEM) {
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if (cannot_compare(tres->flags))
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continue;
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if (tres->flags & IORESOURCE_WINDOW)
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continue;
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taddr = &tres->start;
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tend = &tres->end;
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if (ranged_conflict(addr, end, taddr, tend))
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return 0;
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}
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}
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}
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return 1;
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}
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static irqreturn_t pnp_test_handler(int irq, void *dev_id)
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{
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return IRQ_HANDLED;
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}
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#ifdef CONFIG_PCI
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static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
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unsigned int irq)
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{
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u32 class;
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u8 progif;
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if (pci->irq == irq) {
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pnp_dbg(&pnp->dev, " device %s using irq %d\n",
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pci_name(pci), irq);
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return 1;
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}
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/*
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* See pci_setup_device() and ata_pci_sff_activate_host() for
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* similar IDE legacy detection.
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*/
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pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
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class >>= 8; /* discard revision ID */
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progif = class & 0xff;
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class >>= 8;
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if (class == PCI_CLASS_STORAGE_IDE) {
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/*
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* Unless both channels are native-PCI mode only,
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* treat the compatibility IRQs as busy.
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*/
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if ((progif & 0x5) != 0x5)
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if (pci_get_legacy_ide_irq(pci, 0) == irq ||
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pci_get_legacy_ide_irq(pci, 1) == irq) {
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pnp_dbg(&pnp->dev, " legacy IDE device %s "
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"using irq %d\n", pci_name(pci), irq);
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return 1;
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}
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}
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return 0;
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}
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#endif
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static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
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{
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#ifdef CONFIG_PCI
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struct pci_dev *pci = NULL;
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for_each_pci_dev(pci) {
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if (pci_dev_uses_irq(pnp, pci, irq)) {
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pci_dev_put(pci);
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return 1;
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}
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}
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#endif
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return 0;
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}
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int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
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{
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int i;
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struct pnp_dev *tdev;
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struct resource *tres;
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resource_size_t *irq;
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irq = &res->start;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(res->flags))
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return 1;
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/* check if the resource is valid */
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if (*irq > 15)
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return 0;
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/* check if the resource is reserved */
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for (i = 0; i < 16; i++) {
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if (pnp_reserve_irq[i] == *irq)
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return 0;
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}
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/* check for internal conflicts */
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for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
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if (tres != res && tres->flags & IORESOURCE_IRQ) {
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if (tres->start == *irq)
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return 0;
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}
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}
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/* check if the resource is being used by a pci device */
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if (pci_uses_irq(dev, *irq))
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return 0;
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if (!dev->active) {
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if (request_irq(*irq, pnp_test_handler,
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IRQF_PROBE_SHARED, "pnp", NULL))
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return 0;
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free_irq(*irq, NULL);
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (i = 0;
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(tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
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i++) {
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if (tres->flags & IORESOURCE_IRQ) {
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if (cannot_compare(tres->flags))
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continue;
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if (tres->start == *irq)
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return 0;
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}
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}
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}
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return 1;
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}
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#ifdef CONFIG_ISA_DMA_API
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int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
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{
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int i;
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struct pnp_dev *tdev;
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struct resource *tres;
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resource_size_t *dma;
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dma = &res->start;
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/* if the resource doesn't exist, don't complain about it */
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if (cannot_compare(res->flags))
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return 1;
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/* check if the resource is valid */
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if (*dma == 4 || *dma > 7)
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return 0;
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/* check if the resource is reserved */
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for (i = 0; i < 8; i++) {
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if (pnp_reserve_dma[i] == *dma)
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return 0;
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}
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/* check for internal conflicts */
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for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
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if (tres != res && tres->flags & IORESOURCE_DMA) {
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if (tres->start == *dma)
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return 0;
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}
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}
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/* check if the resource is already in use, skip if the
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* device is active because it itself may be in use */
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if (!dev->active) {
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if (request_dma(*dma, "pnp"))
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return 0;
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free_dma(*dma);
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}
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/* check for conflicts with other pnp devices */
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pnp_for_each_dev(tdev) {
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if (tdev == dev)
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continue;
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for (i = 0;
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(tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
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i++) {
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if (tres->flags & IORESOURCE_DMA) {
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if (cannot_compare(tres->flags))
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continue;
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if (tres->start == *dma)
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return 0;
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}
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}
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}
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return 1;
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}
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#endif /* CONFIG_ISA_DMA_API */
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unsigned long pnp_resource_type(struct resource *res)
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{
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return res->flags & (IORESOURCE_IO | IORESOURCE_MEM |
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IORESOURCE_IRQ | IORESOURCE_DMA |
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IORESOURCE_BUS);
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}
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struct resource *pnp_get_resource(struct pnp_dev *dev,
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unsigned long type, unsigned int num)
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{
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struct pnp_resource *pnp_res;
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struct resource *res;
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list_for_each_entry(pnp_res, &dev->resources, list) {
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res = &pnp_res->res;
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if (pnp_resource_type(res) == type && num-- == 0)
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return res;
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}
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return NULL;
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}
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EXPORT_SYMBOL(pnp_get_resource);
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static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
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{
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struct pnp_resource *pnp_res;
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pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
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if (!pnp_res)
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return NULL;
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list_add_tail(&pnp_res->list, &dev->resources);
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return pnp_res;
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}
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struct pnp_resource *pnp_add_resource(struct pnp_dev *dev,
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struct resource *res)
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{
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struct pnp_resource *pnp_res;
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pnp_res = pnp_new_resource(dev);
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if (!pnp_res) {
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dev_err(&dev->dev, "can't add resource %pR\n", res);
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return NULL;
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}
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pnp_res->res = *res;
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pnp_res->res.name = dev->name;
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dev_dbg(&dev->dev, "%pR\n", res);
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return pnp_res;
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}
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struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
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int flags)
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{
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struct pnp_resource *pnp_res;
|
|
struct resource *res;
|
|
|
|
pnp_res = pnp_new_resource(dev);
|
|
if (!pnp_res) {
|
|
dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
|
|
return NULL;
|
|
}
|
|
|
|
res = &pnp_res->res;
|
|
res->flags = IORESOURCE_IRQ | flags;
|
|
res->start = irq;
|
|
res->end = irq;
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
|
|
return pnp_res;
|
|
}
|
|
|
|
struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
|
|
int flags)
|
|
{
|
|
struct pnp_resource *pnp_res;
|
|
struct resource *res;
|
|
|
|
pnp_res = pnp_new_resource(dev);
|
|
if (!pnp_res) {
|
|
dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
|
|
return NULL;
|
|
}
|
|
|
|
res = &pnp_res->res;
|
|
res->flags = IORESOURCE_DMA | flags;
|
|
res->start = dma;
|
|
res->end = dma;
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
|
|
return pnp_res;
|
|
}
|
|
|
|
struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
|
|
resource_size_t start,
|
|
resource_size_t end, int flags)
|
|
{
|
|
struct pnp_resource *pnp_res;
|
|
struct resource *res;
|
|
|
|
pnp_res = pnp_new_resource(dev);
|
|
if (!pnp_res) {
|
|
dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
|
|
(unsigned long long) start,
|
|
(unsigned long long) end);
|
|
return NULL;
|
|
}
|
|
|
|
res = &pnp_res->res;
|
|
res->flags = IORESOURCE_IO | flags;
|
|
res->start = start;
|
|
res->end = end;
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
|
|
return pnp_res;
|
|
}
|
|
|
|
struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
|
|
resource_size_t start,
|
|
resource_size_t end, int flags)
|
|
{
|
|
struct pnp_resource *pnp_res;
|
|
struct resource *res;
|
|
|
|
pnp_res = pnp_new_resource(dev);
|
|
if (!pnp_res) {
|
|
dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
|
|
(unsigned long long) start,
|
|
(unsigned long long) end);
|
|
return NULL;
|
|
}
|
|
|
|
res = &pnp_res->res;
|
|
res->flags = IORESOURCE_MEM | flags;
|
|
res->start = start;
|
|
res->end = end;
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
|
|
return pnp_res;
|
|
}
|
|
|
|
struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
|
|
resource_size_t start,
|
|
resource_size_t end)
|
|
{
|
|
struct pnp_resource *pnp_res;
|
|
struct resource *res;
|
|
|
|
pnp_res = pnp_new_resource(dev);
|
|
if (!pnp_res) {
|
|
dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
|
|
(unsigned long long) start,
|
|
(unsigned long long) end);
|
|
return NULL;
|
|
}
|
|
|
|
res = &pnp_res->res;
|
|
res->flags = IORESOURCE_BUS;
|
|
res->start = start;
|
|
res->end = end;
|
|
|
|
dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
|
|
return pnp_res;
|
|
}
|
|
|
|
/*
|
|
* Determine whether the specified resource is a possible configuration
|
|
* for this device.
|
|
*/
|
|
int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
|
|
resource_size_t size)
|
|
{
|
|
struct pnp_option *option;
|
|
struct pnp_port *port;
|
|
struct pnp_mem *mem;
|
|
struct pnp_irq *irq;
|
|
struct pnp_dma *dma;
|
|
|
|
list_for_each_entry(option, &dev->options, list) {
|
|
if (option->type != type)
|
|
continue;
|
|
|
|
switch (option->type) {
|
|
case IORESOURCE_IO:
|
|
port = &option->u.port;
|
|
if (port->min == start && port->size == size)
|
|
return 1;
|
|
break;
|
|
case IORESOURCE_MEM:
|
|
mem = &option->u.mem;
|
|
if (mem->min == start && mem->size == size)
|
|
return 1;
|
|
break;
|
|
case IORESOURCE_IRQ:
|
|
irq = &option->u.irq;
|
|
if (start < PNP_IRQ_NR &&
|
|
test_bit(start, irq->map.bits))
|
|
return 1;
|
|
break;
|
|
case IORESOURCE_DMA:
|
|
dma = &option->u.dma;
|
|
if (dma->map & (1 << start))
|
|
return 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pnp_possible_config);
|
|
|
|
int pnp_range_reserved(resource_size_t start, resource_size_t end)
|
|
{
|
|
struct pnp_dev *dev;
|
|
struct pnp_resource *pnp_res;
|
|
resource_size_t *dev_start, *dev_end;
|
|
|
|
pnp_for_each_dev(dev) {
|
|
list_for_each_entry(pnp_res, &dev->resources, list) {
|
|
dev_start = &pnp_res->res.start;
|
|
dev_end = &pnp_res->res.end;
|
|
if (ranged_conflict(&start, &end, dev_start, dev_end))
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(pnp_range_reserved);
|
|
|
|
/* format is: pnp_reserve_irq=irq1[,irq2] .... */
|
|
static int __init pnp_setup_reserve_irq(char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
if (get_option(&str, &pnp_reserve_irq[i]) != 2)
|
|
break;
|
|
return 1;
|
|
}
|
|
|
|
__setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
|
|
|
|
/* format is: pnp_reserve_dma=dma1[,dma2] .... */
|
|
static int __init pnp_setup_reserve_dma(char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 8; i++)
|
|
if (get_option(&str, &pnp_reserve_dma[i]) != 2)
|
|
break;
|
|
return 1;
|
|
}
|
|
|
|
__setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
|
|
|
|
/* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
|
|
static int __init pnp_setup_reserve_io(char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
if (get_option(&str, &pnp_reserve_io[i]) != 2)
|
|
break;
|
|
return 1;
|
|
}
|
|
|
|
__setup("pnp_reserve_io=", pnp_setup_reserve_io);
|
|
|
|
/* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
|
|
static int __init pnp_setup_reserve_mem(char *str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < 16; i++)
|
|
if (get_option(&str, &pnp_reserve_mem[i]) != 2)
|
|
break;
|
|
return 1;
|
|
}
|
|
|
|
__setup("pnp_reserve_mem=", pnp_setup_reserve_mem);
|