Contributors: 33
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jiang Liu |
684 |
38.75% |
9 |
10.59% |
| Björn Helgaas |
314 |
17.79% |
16 |
18.82% |
| Bernhard Kaindl |
128 |
7.25% |
1 |
1.18% |
| Hans de Goede |
120 |
6.80% |
3 |
3.53% |
| Dave Jones |
87 |
4.93% |
3 |
3.53% |
| Paul Menzel |
65 |
3.68% |
1 |
1.18% |
| Yinghai Lu |
48 |
2.72% |
8 |
9.41% |
| Rafael J. Wysocki |
41 |
2.32% |
5 |
5.88% |
| Gary Hade |
37 |
2.10% |
2 |
2.35% |
| Yakui Zhao |
30 |
1.70% |
1 |
1.18% |
| Jon Mason |
25 |
1.42% |
1 |
1.18% |
| Patrick Mochel |
22 |
1.25% |
2 |
2.35% |
| Andy Grover |
22 |
1.25% |
4 |
4.71% |
| Andi Kleen |
18 |
1.02% |
4 |
4.71% |
| Andy Shevchenko |
14 |
0.79% |
2 |
2.35% |
| Matthew Wilcox |
13 |
0.74% |
2 |
2.35% |
| Muli Ben-Yehuda |
13 |
0.74% |
1 |
1.18% |
| Len Brown |
12 |
0.68% |
2 |
2.35% |
| Jonathan Nieder |
11 |
0.62% |
1 |
1.18% |
| Andrew Morton |
10 |
0.57% |
1 |
1.18% |
| Thomas Gleixner |
10 |
0.57% |
2 |
2.35% |
| Mike Yoknis |
8 |
0.45% |
1 |
1.18% |
| Myron Stowe |
7 |
0.40% |
1 |
1.18% |
| Jeff Garzik |
6 |
0.34% |
2 |
2.35% |
| Linus Torvalds (pre-git) |
5 |
0.28% |
2 |
2.35% |
| Matt Domsch |
4 |
0.23% |
1 |
1.18% |
| Shaohua Li |
4 |
0.23% |
1 |
1.18% |
| Hanna V. Linder |
2 |
0.11% |
1 |
1.18% |
| Punit Agrawal |
1 |
0.06% |
1 |
1.18% |
| Nicholas Piggin |
1 |
0.06% |
1 |
1.18% |
| Linus Torvalds |
1 |
0.06% |
1 |
1.18% |
| Jaswinder Singh Rajput |
1 |
0.06% |
1 |
1.18% |
| Greg Kroah-Hartman |
1 |
0.06% |
1 |
1.18% |
| Total |
1765 |
|
85 |
|
// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) "PCI: " fmt
#include <linux/pci.h>
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/pci-acpi.h>
#include <asm/numa.h>
#include <asm/pci_x86.h>
struct pci_root_info {
struct acpi_pci_root_info common;
struct pci_sysdata sd;
#ifdef CONFIG_PCI_MMCONFIG
bool mcfg_added;
u8 start_bus;
u8 end_bus;
#endif
};
bool pci_use_e820 = true;
static bool pci_use_crs = true;
static bool pci_ignore_seg;
static int __init set_use_crs(const struct dmi_system_id *id)
{
pci_use_crs = true;
return 0;
}
static int __init set_nouse_crs(const struct dmi_system_id *id)
{
pci_use_crs = false;
return 0;
}
static int __init set_ignore_seg(const struct dmi_system_id *id)
{
pr_info("%s detected: ignoring ACPI _SEG\n", id->ident);
pci_ignore_seg = true;
return 0;
}
static int __init set_no_e820(const struct dmi_system_id *id)
{
pr_info("%s detected: not clipping E820 regions from _CRS\n",
id->ident);
pci_use_e820 = false;
return 0;
}
static const struct dmi_system_id pci_crs_quirks[] __initconst = {
/* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
{
.callback = set_use_crs,
.ident = "IBM System x3800",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
},
},
/* https://bugzilla.kernel.org/show_bug.cgi?id=16007 */
/* 2006 AMD HT/VIA system with two host bridges */
{
.callback = set_use_crs,
.ident = "ASRock ALiveSATA2-GLAN",
.matches = {
DMI_MATCH(DMI_PRODUCT_NAME, "ALiveSATA2-GLAN"),
},
},
/* https://bugzilla.kernel.org/show_bug.cgi?id=30552 */
/* 2006 AMD HT/VIA system with two host bridges */
{
.callback = set_use_crs,
.ident = "ASUS M2V-MX SE",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_BOARD_NAME, "M2V-MX SE"),
DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
},
},
/* https://bugzilla.kernel.org/show_bug.cgi?id=42619 */
{
.callback = set_use_crs,
.ident = "MSI MS-7253",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "MICRO-STAR INTERNATIONAL CO., LTD"),
DMI_MATCH(DMI_BOARD_NAME, "MS-7253"),
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
},
},
/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/931368 */
/* https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1033299 */
{
.callback = set_use_crs,
.ident = "Foxconn K8M890-8237A",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Foxconn"),
DMI_MATCH(DMI_BOARD_NAME, "K8M890-8237A"),
DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies, LTD"),
},
},
/* Now for the blacklist.. */
/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
{
.callback = set_nouse_crs,
.ident = "Dell Studio 1557",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Studio 1557"),
DMI_MATCH(DMI_BIOS_VERSION, "A09"),
},
},
/* https://bugzilla.redhat.com/show_bug.cgi?id=769657 */
{
.callback = set_nouse_crs,
.ident = "Thinkpad SL510",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
DMI_MATCH(DMI_BOARD_NAME, "2847DFG"),
DMI_MATCH(DMI_BIOS_VERSION, "6JET85WW (1.43 )"),
},
},
/* https://bugzilla.kernel.org/show_bug.cgi?id=42606 */
{
.callback = set_nouse_crs,
.ident = "Supermicro X8DTH",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
DMI_MATCH(DMI_PRODUCT_NAME, "X8DTH-i/6/iF/6F"),
DMI_MATCH(DMI_BIOS_VERSION, "2.0a"),
},
},
/* https://bugzilla.kernel.org/show_bug.cgi?id=15362 */
{
.callback = set_ignore_seg,
.ident = "HP xw9300",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP xw9300 Workstation"),
},
},
/*
* Many Lenovo models with "IIL" in their DMI_PRODUCT_VERSION have
* an E820 reserved region that covers the entire 32-bit host
* bridge memory window from _CRS. Using the E820 region to clip
* _CRS means no space is available for hot-added or uninitialized
* PCI devices. This typically breaks I2C controllers for touchpads
* and hot-added Thunderbolt devices. See the commit log for
* models known to require this quirk and related bug reports.
*/
{
.callback = set_no_e820,
.ident = "Lenovo *IIL* product version",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "IIL"),
},
},
/*
* The Acer Spin 5 (SP513-54N) has the same E820 reservation covering
* the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
* See https://bugs.launchpad.net/bugs/1884232
*/
{
.callback = set_no_e820,
.ident = "Acer Spin 5 (SP513-54N)",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Spin SP513-54N"),
},
},
/*
* Clevo X170KM-G barebones have the same E820 reservation covering
* the entire _CRS 32-bit window issue as the Lenovo *IIL* models.
* See https://bugzilla.kernel.org/show_bug.cgi?id=214259
*/
{
.callback = set_no_e820,
.ident = "Clevo X170KM-G Barebone",
.matches = {
DMI_MATCH(DMI_BOARD_NAME, "X170KM-G"),
},
},
{}
};
void __init pci_acpi_crs_quirks(void)
{
int year = dmi_get_bios_year();
if (year >= 0 && year < 2008 && iomem_resource.end <= 0xffffffff)
pci_use_crs = false;
/*
* Some firmware includes unusable space (host bridge registers,
* hidden PCI device BARs, etc) in PCI host bridge _CRS. This is a
* firmware defect, and 4dc2287c1805 ("x86: avoid E820 regions when
* allocating address space") has clipped out the unusable space in
* the past.
*
* But other firmware supplies E820 reserved regions that cover
* entire _CRS windows, so clipping throws away the entire window,
* leaving none for hot-added or uninitialized devices. These E820
* entries are probably *not* a firmware defect, so disable the
* clipping by default for post-2022 machines.
*
* We already have quirks to disable clipping for pre-2023
* machines, and we'll likely need quirks to *enable* clipping for
* post-2022 machines that incorrectly include unusable space in
* _CRS.
*/
if (year >= 2023)
pci_use_e820 = false;
dmi_check_system(pci_crs_quirks);
/*
* If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
* takes precedence over anything we figured out above.
*/
if (pci_probe & PCI_ROOT_NO_CRS)
pci_use_crs = false;
else if (pci_probe & PCI_USE__CRS)
pci_use_crs = true;
pr_info("%s host bridge windows from ACPI; if necessary, use \"pci=%s\" and report a bug\n",
pci_use_crs ? "Using" : "Ignoring",
pci_use_crs ? "nocrs" : "use_crs");
/* "pci=use_e820"/"pci=no_e820" on the kernel cmdline takes precedence */
if (pci_probe & PCI_NO_E820)
pci_use_e820 = false;
else if (pci_probe & PCI_USE_E820)
pci_use_e820 = true;
pr_info("%s E820 reservations for host bridge windows\n",
pci_use_e820 ? "Using" : "Ignoring");
if (pci_probe & (PCI_NO_E820 | PCI_USE_E820))
pr_info("Please notify linux-pci@vger.kernel.org so future kernels can do this automatically\n");
}
#ifdef CONFIG_PCI_MMCONFIG
static int check_segment(u16 seg, struct device *dev, char *estr)
{
if (seg) {
dev_err(dev, "%s can't access configuration space under this host bridge\n",
estr);
return -EIO;
}
/*
* Failure in adding MMCFG information is not fatal,
* just can't access extended configuration space of
* devices under this host bridge.
*/
dev_warn(dev, "%s can't access extended configuration space under this bridge\n",
estr);
return 0;
}
static int setup_mcfg_map(struct acpi_pci_root_info *ci)
{
int result, seg;
struct pci_root_info *info;
struct acpi_pci_root *root = ci->root;
struct device *dev = &ci->bridge->dev;
info = container_of(ci, struct pci_root_info, common);
info->start_bus = (u8)root->secondary.start;
info->end_bus = (u8)root->secondary.end;
info->mcfg_added = false;
seg = info->sd.domain;
/* return success if MMCFG is not in use */
if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
return 0;
if (!(pci_probe & PCI_PROBE_MMCONF))
return check_segment(seg, dev, "MMCONFIG is disabled,");
result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
root->mcfg_addr);
if (result == 0) {
/* enable MMCFG if it hasn't been enabled yet */
if (raw_pci_ext_ops == NULL)
raw_pci_ext_ops = &pci_mmcfg;
info->mcfg_added = true;
} else if (result != -EEXIST)
return check_segment(seg, dev,
"fail to add MMCONFIG information,");
return 0;
}
static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
{
struct pci_root_info *info;
info = container_of(ci, struct pci_root_info, common);
if (info->mcfg_added) {
pci_mmconfig_delete(info->sd.domain,
info->start_bus, info->end_bus);
info->mcfg_added = false;
}
}
#else
static int setup_mcfg_map(struct acpi_pci_root_info *ci)
{
return 0;
}
static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
{
}
#endif
static int pci_acpi_root_get_node(struct acpi_pci_root *root)
{
int busnum = root->secondary.start;
struct acpi_device *device = root->device;
int node = acpi_get_node(device->handle);
if (node == NUMA_NO_NODE) {
node = x86_pci_root_bus_node(busnum);
if (node != 0 && node != NUMA_NO_NODE)
dev_info(&device->dev, FW_BUG "no _PXM; falling back to node %d from hardware (may be inconsistent with ACPI node numbers)\n",
node);
}
if (node != NUMA_NO_NODE && !node_online(node))
node = NUMA_NO_NODE;
return node;
}
static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
{
return setup_mcfg_map(ci);
}
static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
{
teardown_mcfg_map(ci);
kfree(container_of(ci, struct pci_root_info, common));
}
/*
* An IO port or MMIO resource assigned to a PCI host bridge may be
* consumed by the host bridge itself or available to its child
* bus/devices. The ACPI specification defines a bit (Producer/Consumer)
* to tell whether the resource is consumed by the host bridge itself,
* but firmware hasn't used that bit consistently, so we can't rely on it.
*
* On x86 and IA64 platforms, all IO port and MMIO resources are assumed
* to be available to child bus/devices except one special case:
* IO port [0xCF8-0xCFF] is consumed by the host bridge itself
* to access PCI configuration space.
*
* So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
*/
static bool resource_is_pcicfg_ioport(struct resource *res)
{
return (res->flags & IORESOURCE_IO) &&
res->start == 0xCF8 && res->end == 0xCFF;
}
static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
{
struct acpi_device *device = ci->bridge;
int busnum = ci->root->secondary.start;
struct resource_entry *entry, *tmp;
int status;
status = acpi_pci_probe_root_resources(ci);
if (pci_use_crs) {
resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
if (resource_is_pcicfg_ioport(entry->res))
resource_list_destroy_entry(entry);
return status;
}
resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
dev_printk(KERN_DEBUG, &device->dev,
"host bridge window %pR (ignored)\n", entry->res);
resource_list_destroy_entry(entry);
}
x86_pci_root_bus_resources(busnum, &ci->resources);
return 0;
}
static struct acpi_pci_root_ops acpi_pci_root_ops = {
.pci_ops = &pci_root_ops,
.init_info = pci_acpi_root_init_info,
.release_info = pci_acpi_root_release_info,
.prepare_resources = pci_acpi_root_prepare_resources,
};
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
{
int domain = root->segment;
int busnum = root->secondary.start;
int node = pci_acpi_root_get_node(root);
struct pci_bus *bus;
if (pci_ignore_seg)
root->segment = domain = 0;
if (domain && !pci_domains_supported) {
pr_warn("pci_bus %04x:%02x: ignored (multiple domains not supported)\n",
domain, busnum);
return NULL;
}
bus = pci_find_bus(domain, busnum);
if (bus) {
/*
* If the desired bus has been scanned already, replace
* its bus->sysdata.
*/
struct pci_sysdata sd = {
.domain = domain,
.node = node,
.companion = root->device
};
memcpy(bus->sysdata, &sd, sizeof(sd));
} else {
struct pci_root_info *info;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
dev_err(&root->device->dev,
"pci_bus %04x:%02x: ignored (out of memory)\n",
domain, busnum);
else {
info->sd.domain = domain;
info->sd.node = node;
info->sd.companion = root->device;
bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
&info->common, &info->sd);
}
}
/* After the PCI-E bus has been walked and all devices discovered,
* configure any settings of the fabric that might be necessary.
*/
if (bus) {
struct pci_bus *child;
list_for_each_entry(child, &bus->children, node)
pcie_bus_configure_settings(child);
}
return bus;
}
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
/*
* We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
* here, pci_create_root_bus() has been called by someone else and
* sysdata is likely to be different from what we expect. Let it go in
* that case.
*/
if (!bridge->dev.parent) {
struct pci_sysdata *sd = bridge->bus->sysdata;
ACPI_COMPANION_SET(&bridge->dev, sd->companion);
}
return 0;
}
int __init pci_acpi_init(void)
{
struct pci_dev *dev = NULL;
if (acpi_noirq)
return -ENODEV;
pr_info("Using ACPI for IRQ routing\n");
acpi_irq_penalty_init();
pcibios_enable_irq = acpi_pci_irq_enable;
pcibios_disable_irq = acpi_pci_irq_disable;
x86_init.pci.init_irq = x86_init_noop;
if (pci_routeirq) {
/*
* PCI IRQ routing is set up by pci_enable_device(), but we
* also do it here in case there are still broken drivers that
* don't use pci_enable_device().
*/
pr_info("Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
for_each_pci_dev(dev)
acpi_pci_irq_enable(dev);
}
return 0;
}