linux/drivers/pnp/quirks.c
Bjorn Helgaas f7834c092c PNP: Don't check for overlaps with unassigned PCI BARs
After 0509ad5e1a ("PNP: disable PNP motherboard resources that overlap
PCI BARs"), we disable and warn about PNP resources that overlap PCI BARs.
But we assume that all PCI BARs are valid, which is incorrect, because a
BAR may not have any space assigned to it.  In that case, we will not
enable the BAR, so no other resource can conflict with it.

Ignore PCI BARs that are unassigned, as indicated by IORESOURCE_UNSET.

Firmware often leaves PCI BARs unassigned, containing zero.  Zero is a
valid BAR value, so we can't just check for that, but the PCI core can set
IORESOURCE_UNSET when it detects an unassigned BAR by other means.  This
should get rid of many of the annoying messages like this:

  pnp 00:00: disabling [io  0x0061] because it overlaps 0001:05:00.0 BAR 0 [io  0x0000-0x00ff]

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-03-12 12:30:00 -05:00

464 lines
12 KiB
C

/*
* 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 */
0x0c00, /* Haswell */
};
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);
}
}