serial: fix race between flush_to_ldisc and tty_open

[linux-stable.git] / drivers / pnp / quirks.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  This file contains quirk handling code for PnP devices
 *  Some devices do not report all their resources, and need to have extra
 *  resources added. This is most easily accomplished at initialisation time
 *  when building up the resource structure for the first time.
 *
 *  Copyright (c) 2000 Peter Denison <peterd@pnd-pc.demon.co.uk>
 *  Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
 *      Bjorn Helgaas <bjorn.helgaas@hp.com>
 *
 *  Heavily based on PCI quirks handling which is
 *
 *  Copyright (c) 1999 Martin Mares <mj@ucw.cz>
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/pnp.h>
#include <linux/io.h>
#include <linux/kallsyms.h>
#include "base.h"

static void quirk_awe32_add_ports(struct pnp_dev *dev,
                                  struct pnp_option *option,
                                  unsigned int offset)
{
        struct pnp_option *new_option;

        new_option = kmalloc(sizeof(struct pnp_option), GFP_KERNEL);
        if (!new_option) {
                dev_err(&dev->dev, "couldn't add ioport region to option set "
                        "%d\n", pnp_option_set(option));
                return;
        }

        *new_option = *option;
        new_option->u.port.min += offset;
        new_option->u.port.max += offset;
        list_add(&new_option->list, &option->list);

        dev_info(&dev->dev, "added ioport region %#llx-%#llx to set %d\n",
                (unsigned long long) new_option->u.port.min,
                (unsigned long long) new_option->u.port.max,
                pnp_option_set(option));
}

static void quirk_awe32_resources(struct pnp_dev *dev)
{
        struct pnp_option *option;
        unsigned int set = ~0;

        /*
         * Add two extra ioport regions (at offset 0x400 and 0x800 from the
         * one given) to every dependent option set.
         */
        list_for_each_entry(option, &dev->options, list) {
                if (pnp_option_is_dependent(option) &&
                    pnp_option_set(option) != set) {
                        set = pnp_option_set(option);
                        quirk_awe32_add_ports(dev, option, 0x800);
                        quirk_awe32_add_ports(dev, option, 0x400);
                }
        }
}

static void quirk_cmi8330_resources(struct pnp_dev *dev)
{
        struct pnp_option *option;
        struct pnp_irq *irq;
        struct pnp_dma *dma;

        list_for_each_entry(option, &dev->options, list) {
                if (!pnp_option_is_dependent(option))
                        continue;

                if (option->type == IORESOURCE_IRQ) {
                        irq = &option->u.irq;
                        bitmap_zero(irq->map.bits, PNP_IRQ_NR);
                        __set_bit(5, irq->map.bits);
                        __set_bit(7, irq->map.bits);
                        __set_bit(10, irq->map.bits);
                        dev_info(&dev->dev, "set possible IRQs in "
                                 "option set %d to 5, 7, 10\n",
                                 pnp_option_set(option));
                } else if (option->type == IORESOURCE_DMA) {
                        dma = &option->u.dma;
                        if ((dma->flags & IORESOURCE_DMA_TYPE_MASK) ==
                                                IORESOURCE_DMA_8BIT &&
                            dma->map != 0x0A) {
                                dev_info(&dev->dev, "changing possible "
                                         "DMA channel mask in option set %d "
                                         "from %#02x to 0x0A (1, 3)\n",
                                         pnp_option_set(option), dma->map);
                                dma->map = 0x0A;
                        }
                }
        }
}

static void quirk_sb16audio_resources(struct pnp_dev *dev)
{
        struct pnp_option *option;
        unsigned int prev_option_flags = ~0, n = 0;
        struct pnp_port *port;

        /*
         * The default range on the OPL port for these devices is 0x388-0x388.
         * Here we increase that range so that two such cards can be
         * auto-configured.
         */
        list_for_each_entry(option, &dev->options, list) {
                if (prev_option_flags != option->flags) {
                        prev_option_flags = option->flags;
                        n = 0;
                }

                if (pnp_option_is_dependent(option) &&
                    option->type == IORESOURCE_IO) {
                        n++;
                        port = &option->u.port;
                        if (n == 3 && port->min == port->max) {
                                port->max += 0x70;
                                dev_info(&dev->dev, "increased option port "
                                         "range from %#llx-%#llx to "
                                         "%#llx-%#llx\n",
                                         (unsigned long long) port->min,
                                         (unsigned long long) port->min,
                                         (unsigned long long) port->min,
                                         (unsigned long long) port->max);
                        }
                }
        }
}

static struct pnp_option *pnp_clone_dependent_set(struct pnp_dev *dev,
                                                  unsigned int set)
{
        struct pnp_option *tail = NULL, *first_new_option = NULL;
        struct pnp_option *option, *new_option;
        unsigned int flags;

        list_for_each_entry(option, &dev->options, list) {
                if (pnp_option_is_dependent(option))
                        tail = option;
        }
        if (!tail) {
                dev_err(&dev->dev, "no dependent option sets\n");
                return NULL;
        }

        flags = pnp_new_dependent_set(dev, PNP_RES_PRIORITY_FUNCTIONAL);
        list_for_each_entry(option, &dev->options, list) {
                if (pnp_option_is_dependent(option) &&
                    pnp_option_set(option) == set) {
                        new_option = kmalloc(sizeof(struct pnp_option),
                                             GFP_KERNEL);
                        if (!new_option) {
                                dev_err(&dev->dev, "couldn't clone dependent "
                                        "set %d\n", set);
                                return NULL;
                        }

                        *new_option = *option;
                        new_option->flags = flags;
                        if (!first_new_option)
                                first_new_option = new_option;

                        list_add(&new_option->list, &tail->list);
                        tail = new_option;
                }
        }

        return first_new_option;
}


static void quirk_add_irq_optional_dependent_sets(struct pnp_dev *dev)
{
        struct pnp_option *new_option;
        unsigned int num_sets, i, set;
        struct pnp_irq *irq;

        num_sets = dev->num_dependent_sets;
        for (i = 0; i < num_sets; i++) {
                new_option = pnp_clone_dependent_set(dev, i);
                if (!new_option)
                        return;

                set = pnp_option_set(new_option);
                while (new_option && pnp_option_set(new_option) == set) {
                        if (new_option->type == IORESOURCE_IRQ) {
                                irq = &new_option->u.irq;
                                irq->flags |= IORESOURCE_IRQ_OPTIONAL;
                        }
                        dbg_pnp_show_option(dev, new_option);
                        new_option = list_entry(new_option->list.next,
                                                struct pnp_option, list);
                }

                dev_info(&dev->dev, "added dependent option set %d (same as "
                         "set %d except IRQ optional)\n", set, i);
        }
}

static void quirk_ad1815_mpu_resources(struct pnp_dev *dev)
{
        struct pnp_option *option;
        struct pnp_irq *irq = NULL;
        unsigned int independent_irqs = 0;

        list_for_each_entry(option, &dev->options, list) {
                if (option->type == IORESOURCE_IRQ &&
                    !pnp_option_is_dependent(option)) {
                        independent_irqs++;
                        irq = &option->u.irq;
                }
        }

        if (independent_irqs != 1)
                return;

        irq->flags |= IORESOURCE_IRQ_OPTIONAL;
        dev_info(&dev->dev, "made independent IRQ optional\n");
}

#include <linux/pci.h>

static void quirk_system_pci_resources(struct pnp_dev *dev)
{
        struct pci_dev *pdev = NULL;
        struct resource *res;
        resource_size_t pnp_start, pnp_end, pci_start, pci_end;
        int i, j;

        /*
         * Some BIOSes have PNP motherboard devices with resources that
         * partially overlap PCI BARs.  The PNP system driver claims these
         * motherboard resources, which prevents the normal PCI driver from
         * requesting them later.
         *
         * This patch disables the PNP resources that conflict with PCI BARs
         * so they won't be claimed by the PNP system driver.
         */
        for_each_pci_dev(pdev) {
                for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
                        unsigned long flags, type;

                        flags = pci_resource_flags(pdev, i);
                        type = flags & (IORESOURCE_IO | IORESOURCE_MEM);
                        if (!type || pci_resource_len(pdev, i) == 0)
                                continue;

                        if (flags & IORESOURCE_UNSET)
                                continue;

                        pci_start = pci_resource_start(pdev, i);
                        pci_end = pci_resource_end(pdev, i);
                        for (j = 0;
                             (res = pnp_get_resource(dev, type, j)); j++) {
                                if (res->start == 0 && res->end == 0)
                                        continue;

                                pnp_start = res->start;
                                pnp_end = res->end;

                                /*
                                 * If the PNP region doesn't overlap the PCI
                                 * region at all, there's no problem.
                                 */
                                if (pnp_end < pci_start || pnp_start > pci_end)
                                        continue;

                                /*
                                 * If the PNP region completely encloses (or is
                                 * at least as large as) the PCI region, that's
                                 * also OK.  For example, this happens when the
                                 * PNP device describes a bridge with PCI
                                 * behind it.
                                 */
                                if (pnp_start <= pci_start &&
                                    pnp_end >= pci_end)
                                        continue;

                                /*
                                 * Otherwise, the PNP region overlaps *part* of
                                 * the PCI region, and that might prevent a PCI
                                 * driver from requesting its resources.
                                 */
                                dev_warn(&dev->dev,
                                         "disabling %pR because it overlaps "
                                         "%s BAR %d %pR\n", res,
                                         pci_name(pdev), i, &pdev->resource[i]);
                                res->flags |= IORESOURCE_DISABLED;
                        }
                }
        }
}

#ifdef CONFIG_AMD_NB

#include <asm/amd_nb.h>

static void quirk_amd_mmconfig_area(struct pnp_dev *dev)
{
        resource_size_t start, end;
        struct pnp_resource *pnp_res;
        struct resource *res;
        struct resource mmconfig_res, *mmconfig;

        mmconfig = amd_get_mmconfig_range(&mmconfig_res);
        if (!mmconfig)
                return;

        list_for_each_entry(pnp_res, &dev->resources, list) {
                res = &pnp_res->res;
                if (res->end < mmconfig->start || res->start > mmconfig->end ||
                    (res->start == mmconfig->start && res->end == mmconfig->end))
                        continue;

                dev_info(&dev->dev, FW_BUG
                         "%pR covers only part of AMD MMCONFIG area %pR; adding more reservations\n",
                         res, mmconfig);
                if (mmconfig->start < res->start) {
                        start = mmconfig->start;
                        end = res->start - 1;
                        pnp_add_mem_resource(dev, start, end, 0);
                }
                if (mmconfig->end > res->end) {
                        start = res->end + 1;
                        end = mmconfig->end;
                        pnp_add_mem_resource(dev, start, end, 0);
                }
                break;
        }
}
#endif

#ifdef CONFIG_PCI
/* Device IDs of parts that have 32KB MCH space */
static const unsigned int mch_quirk_devices[] = {
        0x0154, /* Ivy Bridge */
        0x0a04, /* Haswell-ULT */
        0x0c00, /* Haswell */
        0x1604, /* Broadwell */
};

static struct pci_dev *get_intel_host(void)
{
        int i;
        struct pci_dev *host;

        for (i = 0; i < ARRAY_SIZE(mch_quirk_devices); i++) {
                host = pci_get_device(PCI_VENDOR_ID_INTEL, mch_quirk_devices[i],
                                      NULL);
                if (host)
                        return host;
        }
        return NULL;
}

static void quirk_intel_mch(struct pnp_dev *dev)
{
        struct pci_dev *host;
        u32 addr_lo, addr_hi;
        struct pci_bus_region region;
        struct resource mch;
        struct pnp_resource *pnp_res;
        struct resource *res;

        host = get_intel_host();
        if (!host)
                return;

        /*
         * MCHBAR is not an architected PCI BAR, so MCH space is usually
         * reported as a PNP0C02 resource.  The MCH space was originally
         * 16KB, but is 32KB in newer parts.  Some BIOSes still report a
         * PNP0C02 resource that is only 16KB, which means the rest of the
         * MCH space is consumed but unreported.
         */

        /*
         * Read MCHBAR for Host Member Mapped Register Range Base
         * https://www-ssl.intel.com/content/www/us/en/processors/core/4th-gen-core-family-desktop-vol-2-datasheet
         * Sec 3.1.12.
         */
        pci_read_config_dword(host, 0x48, &addr_lo);
        region.start = addr_lo & ~0x7fff;
        pci_read_config_dword(host, 0x4c, &addr_hi);
        region.start |= (u64) addr_hi << 32;
        region.end = region.start + 32*1024 - 1;

        memset(&mch, 0, sizeof(mch));
        mch.flags = IORESOURCE_MEM;
        pcibios_bus_to_resource(host->bus, &mch, &region);

        list_for_each_entry(pnp_res, &dev->resources, list) {
                res = &pnp_res->res;
                if (res->end < mch.start || res->start > mch.end)
                        continue;       /* no overlap */
                if (res->start == mch.start && res->end == mch.end)
                        continue;       /* exact match */

                dev_info(&dev->dev, FW_BUG "PNP resource %pR covers only part of %s Intel MCH; extending to %pR\n",
                         res, pci_name(host), &mch);
                res->start = mch.start;
                res->end = mch.end;
                break;
        }

        pci_dev_put(host);
}
#endif

/*
 *  PnP Quirks
 *  Cards or devices that need some tweaking due to incomplete resource info
 */

static struct pnp_fixup pnp_fixups[] = {
        /* Soundblaster awe io port quirk */
        {"CTL0021", quirk_awe32_resources},
        {"CTL0022", quirk_awe32_resources},
        {"CTL0023", quirk_awe32_resources},
        /* CMI 8330 interrupt and dma fix */
        {"@X@0001", quirk_cmi8330_resources},
        /* Soundblaster audio device io port range quirk */
        {"CTL0001", quirk_sb16audio_resources},
        {"CTL0031", quirk_sb16audio_resources},
        {"CTL0041", quirk_sb16audio_resources},
        {"CTL0042", quirk_sb16audio_resources},
        {"CTL0043", quirk_sb16audio_resources},
        {"CTL0044", quirk_sb16audio_resources},
        {"CTL0045", quirk_sb16audio_resources},
        /* Add IRQ-optional MPU options */
        {"ADS7151", quirk_ad1815_mpu_resources},
        {"ADS7181", quirk_add_irq_optional_dependent_sets},
        {"AZT0002", quirk_add_irq_optional_dependent_sets},
        /* PnP resources that might overlap PCI BARs */
        {"PNP0c01", quirk_system_pci_resources},
        {"PNP0c02", quirk_system_pci_resources},
#ifdef CONFIG_AMD_NB
        {"PNP0c01", quirk_amd_mmconfig_area},
#endif
#ifdef CONFIG_PCI
        {"PNP0c02", quirk_intel_mch},
#endif
        {""}
};

void pnp_fixup_device(struct pnp_dev *dev)
{
        struct pnp_fixup *f;

        for (f = pnp_fixups; *f->id; f++) {
                if (!compare_pnp_id(dev->id, f->id))
                        continue;
                pnp_dbg(&dev->dev, "%s: calling %pF\n", f->id,
                        f->quirk_function);
                f->quirk_function(dev);
        }
}