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probe.c
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// SPDX-License-Identifier: GPL-2.0
/*
* PCI detection and setup code
*/
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pci_hotplug.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/cpumask.h>
#include <linux/aer.h>
#include <linux/acpi.h>
#include <linux/hypervisor.h>
#include <linux/irqdomain.h>
#include <linux/pm_runtime.h>
#include <linux/bitfield.h>
#include "pci.h"
#define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
#define CARDBUS_RESERVE_BUSNR 3
static struct resource busn_resource = {
.name = "PCI busn",
.start = 0,
.end = 255,
.flags = IORESOURCE_BUS,
};
/* Ugh. Need to stop exporting this to modules. */
LIST_HEAD(pci_root_buses);
EXPORT_SYMBOL(pci_root_buses);
static LIST_HEAD(pci_domain_busn_res_list);
struct pci_domain_busn_res {
struct list_head list;
struct resource res;
int domain_nr;
};
static struct resource *get_pci_domain_busn_res(int domain_nr)
{
struct pci_domain_busn_res *r;
list_for_each_entry(r, &pci_domain_busn_res_list, list)
if (r->domain_nr == domain_nr)
return &r->res;
r = kzalloc(sizeof(*r), GFP_KERNEL);
if (!r)
return NULL;
r->domain_nr = domain_nr;
r->res.start = 0;
r->res.end = 0xff;
r->res.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED;
list_add_tail(&r->list, &pci_domain_busn_res_list);
return &r->res;
}
/*
* Some device drivers need know if PCI is initiated.
* Basically, we think PCI is not initiated when there
* is no device to be found on the pci_bus_type.
*/
int no_pci_devices(void)
{
struct device *dev;
int no_devices;
dev = bus_find_next_device(&pci_bus_type, NULL);
no_devices = (dev == NULL);
put_device(dev);
return no_devices;
}
EXPORT_SYMBOL(no_pci_devices);
/*
* PCI Bus Class
*/
static void release_pcibus_dev(struct device *dev)
{
struct pci_bus *pci_bus = to_pci_bus(dev);
put_device(pci_bus->bridge);
pci_bus_remove_resources(pci_bus);
pci_release_bus_of_node(pci_bus);
kfree(pci_bus);
}
static const struct class pcibus_class = {
.name = "pci_bus",
.dev_release = &release_pcibus_dev,
.dev_groups = pcibus_groups,
};
static int __init pcibus_class_init(void)
{
return class_register(&pcibus_class);
}
postcore_initcall(pcibus_class_init);
static u64 pci_size(u64 base, u64 maxbase, u64 mask)
{
u64 size = mask & maxbase; /* Find the significant bits */
if (!size)
return 0;
/*
* Get the lowest of them to find the decode size, and from that
* the extent.
*/
size = size & ~(size-1);
/*
* base == maxbase can be valid only if the BAR has already been
* programmed with all 1s.
*/
if (base == maxbase && ((base | (size - 1)) & mask) != mask)
return 0;
return size;
}
static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
{
u32 mem_type;
unsigned long flags;
if ((bar & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
flags = bar & ~PCI_BASE_ADDRESS_IO_MASK;
flags |= IORESOURCE_IO;
return flags;
}
flags = bar & ~PCI_BASE_ADDRESS_MEM_MASK;
flags |= IORESOURCE_MEM;
if (flags & PCI_BASE_ADDRESS_MEM_PREFETCH)
flags |= IORESOURCE_PREFETCH;
mem_type = bar & PCI_BASE_ADDRESS_MEM_TYPE_MASK;
switch (mem_type) {
case PCI_BASE_ADDRESS_MEM_TYPE_32:
break;
case PCI_BASE_ADDRESS_MEM_TYPE_1M:
/* 1M mem BAR treated as 32-bit BAR */
break;
case PCI_BASE_ADDRESS_MEM_TYPE_64:
flags |= IORESOURCE_MEM_64;
break;
default:
/* mem unknown type treated as 32-bit BAR */
break;
}
return flags;
}
#define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO)
/**
* __pci_size_bars - Read the raw BAR mask for a range of PCI BARs
* @dev: the PCI device
* @count: number of BARs to size
* @pos: starting config space position
* @sizes: array to store mask values
* @rom: indicate whether to use ROM mask, which avoids enabling ROM BARs
*
* Provided @sizes array must be sufficiently sized to store results for
* @count u32 BARs. Caller is responsible for disabling decode to specified
* BAR range around calling this function. This function is intended to avoid
* disabling decode around sizing each BAR individually, which can result in
* non-trivial overhead in virtualized environments with very large PCI BARs.
*/
static void __pci_size_bars(struct pci_dev *dev, int count,
unsigned int pos, u32 *sizes, bool rom)
{
u32 orig, mask = rom ? PCI_ROM_ADDRESS_MASK : ~0;
int i;
for (i = 0; i < count; i++, pos += 4, sizes++) {
pci_read_config_dword(dev, pos, &orig);
pci_write_config_dword(dev, pos, mask);
pci_read_config_dword(dev, pos, sizes);
pci_write_config_dword(dev, pos, orig);
}
}
void __pci_size_stdbars(struct pci_dev *dev, int count,
unsigned int pos, u32 *sizes)
{
__pci_size_bars(dev, count, pos, sizes, false);
}
static void __pci_size_rom(struct pci_dev *dev, unsigned int pos, u32 *sizes)
{
__pci_size_bars(dev, 1, pos, sizes, true);
}
/**
* __pci_read_base - Read a PCI BAR
* @dev: the PCI device
* @type: type of the BAR
* @res: resource buffer to be filled in
* @pos: BAR position in the config space
* @sizes: array of one or more pre-read BAR masks
*
* Returns 1 if the BAR is 64-bit, or 0 if 32-bit.
*/
int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
struct resource *res, unsigned int pos, u32 *sizes)
{
u32 l = 0, sz;
u64 l64, sz64, mask64;
struct pci_bus_region region, inverted_region;
const char *res_name = pci_resource_name(dev, res - dev->resource);
res->name = pci_name(dev);
pci_read_config_dword(dev, pos, &l);
sz = sizes[0];
/*
* All bits set in sz means the device isn't working properly.
* If the BAR isn't implemented, all bits must be 0. If it's a
* memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
* 1 must be clear.
*/
if (PCI_POSSIBLE_ERROR(sz))
sz = 0;
/*
* I don't know how l can have all bits set. Copied from old code.
* Maybe it fixes a bug on some ancient platform.
*/
if (PCI_POSSIBLE_ERROR(l))
l = 0;
if (type == pci_bar_unknown) {
res->flags = decode_bar(dev, l);
res->flags |= IORESOURCE_SIZEALIGN;
if (res->flags & IORESOURCE_IO) {
l64 = l & PCI_BASE_ADDRESS_IO_MASK;
sz64 = sz & PCI_BASE_ADDRESS_IO_MASK;
mask64 = PCI_BASE_ADDRESS_IO_MASK & (u32)IO_SPACE_LIMIT;
} else {
l64 = l & PCI_BASE_ADDRESS_MEM_MASK;
sz64 = sz & PCI_BASE_ADDRESS_MEM_MASK;
mask64 = (u32)PCI_BASE_ADDRESS_MEM_MASK;
}
} else {
if (l & PCI_ROM_ADDRESS_ENABLE)
res->flags |= IORESOURCE_ROM_ENABLE;
l64 = l & PCI_ROM_ADDRESS_MASK;
sz64 = sz & PCI_ROM_ADDRESS_MASK;
mask64 = PCI_ROM_ADDRESS_MASK;
}
if (res->flags & IORESOURCE_MEM_64) {
pci_read_config_dword(dev, pos + 4, &l);
sz = sizes[1];
l64 |= ((u64)l << 32);
sz64 |= ((u64)sz << 32);
mask64 |= ((u64)~0 << 32);
}
if (!sz64)
goto fail;
sz64 = pci_size(l64, sz64, mask64);
if (!sz64) {
pci_info(dev, FW_BUG "%s: invalid; can't size\n", res_name);
goto fail;
}
if (res->flags & IORESOURCE_MEM_64) {
if ((sizeof(pci_bus_addr_t) < 8 || sizeof(resource_size_t) < 8)
&& sz64 > 0x100000000ULL) {
res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
res->start = 0;
res->end = 0;
pci_err(dev, "%s: can't handle BAR larger than 4GB (size %#010llx)\n",
res_name, (unsigned long long)sz64);
goto out;
}
if ((sizeof(pci_bus_addr_t) < 8) && l) {
/* Above 32-bit boundary; try to reallocate */
res->flags |= IORESOURCE_UNSET;
res->start = 0;
res->end = sz64 - 1;
pci_info(dev, "%s: can't handle BAR above 4GB (bus address %#010llx)\n",
res_name, (unsigned long long)l64);
goto out;
}
}
region.start = l64;
region.end = l64 + sz64 - 1;
pcibios_bus_to_resource(dev->bus, res, ®ion);
pcibios_resource_to_bus(dev->bus, &inverted_region, res);
/*
* If "A" is a BAR value (a bus address), "bus_to_resource(A)" is
* the corresponding resource address (the physical address used by
* the CPU. Converting that resource address back to a bus address
* should yield the original BAR value:
*
* resource_to_bus(bus_to_resource(A)) == A
*
* If it doesn't, CPU accesses to "bus_to_resource(A)" will not
* be claimed by the device.
*/
if (inverted_region.start != region.start) {
res->flags |= IORESOURCE_UNSET;
res->start = 0;
res->end = region.end - region.start;
pci_info(dev, "%s: initial BAR value %#010llx invalid\n",
res_name, (unsigned long long)region.start);
}
goto out;
fail:
res->flags = 0;
out:
if (res->flags)
pci_info(dev, "%s %pR\n", res_name, res);
return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
}
static __always_inline void pci_read_bases(struct pci_dev *dev,
unsigned int howmany, int rom)
{
u32 rombar, stdbars[PCI_STD_NUM_BARS];
unsigned int pos, reg;
u16 orig_cmd;
BUILD_BUG_ON(statically_true(howmany > PCI_STD_NUM_BARS));
if (dev->non_compliant_bars)
return;
/* Per PCIe r4.0, sec 9.3.4.1.11, the VF BARs are all RO Zero */
if (dev->is_virtfn)
return;
/* No printks while decoding is disabled! */
if (!dev->mmio_always_on) {
pci_read_config_word(dev, PCI_COMMAND, &orig_cmd);
if (orig_cmd & PCI_COMMAND_DECODE_ENABLE) {
pci_write_config_word(dev, PCI_COMMAND,
orig_cmd & ~PCI_COMMAND_DECODE_ENABLE);
}
}
__pci_size_stdbars(dev, howmany, PCI_BASE_ADDRESS_0, stdbars);
if (rom)
__pci_size_rom(dev, rom, &rombar);
if (!dev->mmio_always_on &&
(orig_cmd & PCI_COMMAND_DECODE_ENABLE))
pci_write_config_word(dev, PCI_COMMAND, orig_cmd);
for (pos = 0; pos < howmany; pos++) {
struct resource *res = &dev->resource[pos];
reg = PCI_BASE_ADDRESS_0 + (pos << 2);
pos += __pci_read_base(dev, pci_bar_unknown,
res, reg, &stdbars[pos]);
}
if (rom) {
struct resource *res = &dev->resource[PCI_ROM_RESOURCE];
dev->rom_base_reg = rom;
res->flags = IORESOURCE_MEM | IORESOURCE_PREFETCH |
IORESOURCE_READONLY | IORESOURCE_SIZEALIGN;
__pci_read_base(dev, pci_bar_mem32, res, rom, &rombar);
}
}
static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
bool log)
{
u8 io_base_lo, io_limit_lo;
unsigned long io_mask, io_granularity, base, limit;
struct pci_bus_region region;
io_mask = PCI_IO_RANGE_MASK;
io_granularity = 0x1000;
if (dev->io_window_1k) {
/* Support 1K I/O space granularity */
io_mask = PCI_IO_1K_RANGE_MASK;
io_granularity = 0x400;
}
pci_read_config_byte(dev, PCI_IO_BASE, &io_base_lo);
pci_read_config_byte(dev, PCI_IO_LIMIT, &io_limit_lo);
base = (io_base_lo & io_mask) << 8;
limit = (io_limit_lo & io_mask) << 8;
if ((io_base_lo & PCI_IO_RANGE_TYPE_MASK) == PCI_IO_RANGE_TYPE_32) {
u16 io_base_hi, io_limit_hi;
pci_read_config_word(dev, PCI_IO_BASE_UPPER16, &io_base_hi);
pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);
base |= ((unsigned long) io_base_hi << 16);
limit |= ((unsigned long) io_limit_hi << 16);
}
if (base <= limit) {
res->flags = (io_base_lo & PCI_IO_RANGE_TYPE_MASK) | IORESOURCE_IO;
region.start = base;
region.end = limit + io_granularity - 1;
pcibios_bus_to_resource(dev->bus, res, ®ion);
if (log)
pci_info(dev, " bridge window %pR\n", res);
}
}
static void pci_read_bridge_mmio(struct pci_dev *dev, struct resource *res,
bool log)
{
u16 mem_base_lo, mem_limit_lo;
unsigned long base, limit;
struct pci_bus_region region;
pci_read_config_word(dev, PCI_MEMORY_BASE, &mem_base_lo);
pci_read_config_word(dev, PCI_MEMORY_LIMIT, &mem_limit_lo);
base = ((unsigned long) mem_base_lo & PCI_MEMORY_RANGE_MASK) << 16;
limit = ((unsigned long) mem_limit_lo & PCI_MEMORY_RANGE_MASK) << 16;
if (base <= limit) {
res->flags = (mem_base_lo & PCI_MEMORY_RANGE_TYPE_MASK) | IORESOURCE_MEM;
region.start = base;
region.end = limit + 0xfffff;
pcibios_bus_to_resource(dev->bus, res, ®ion);
if (log)
pci_info(dev, " bridge window %pR\n", res);
}
}
static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
bool log)
{
u16 mem_base_lo, mem_limit_lo;
u64 base64, limit64;
pci_bus_addr_t base, limit;
struct pci_bus_region region;
pci_read_config_word(dev, PCI_PREF_MEMORY_BASE, &mem_base_lo);
pci_read_config_word(dev, PCI_PREF_MEMORY_LIMIT, &mem_limit_lo);
base64 = (mem_base_lo & PCI_PREF_RANGE_MASK) << 16;
limit64 = (mem_limit_lo & PCI_PREF_RANGE_MASK) << 16;
if ((mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
u32 mem_base_hi, mem_limit_hi;
pci_read_config_dword(dev, PCI_PREF_BASE_UPPER32, &mem_base_hi);
pci_read_config_dword(dev, PCI_PREF_LIMIT_UPPER32, &mem_limit_hi);
/*
* Some bridges set the base > limit by default, and some
* (broken) BIOSes do not initialize them. If we find
* this, just assume they are not being used.
*/
if (mem_base_hi <= mem_limit_hi) {
base64 |= (u64) mem_base_hi << 32;
limit64 |= (u64) mem_limit_hi << 32;
}
}
base = (pci_bus_addr_t) base64;
limit = (pci_bus_addr_t) limit64;
if (base != base64) {
pci_err(dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
(unsigned long long) base64);
return;
}
if (base <= limit) {
res->flags = (mem_base_lo & PCI_PREF_RANGE_TYPE_MASK) |
IORESOURCE_MEM | IORESOURCE_PREFETCH;
if (res->flags & PCI_PREF_RANGE_TYPE_64)
res->flags |= IORESOURCE_MEM_64;
region.start = base;
region.end = limit + 0xfffff;
pcibios_bus_to_resource(dev->bus, res, ®ion);
if (log)
pci_info(dev, " bridge window %pR\n", res);
}
}
static void pci_read_bridge_windows(struct pci_dev *bridge)
{
u32 buses;
u16 io;
u32 pmem, tmp;
struct resource res;
pci_read_config_dword(bridge, PCI_PRIMARY_BUS, &buses);
res.flags = IORESOURCE_BUS;
res.start = (buses >> 8) & 0xff;
res.end = (buses >> 16) & 0xff;
pci_info(bridge, "PCI bridge to %pR%s\n", &res,
bridge->transparent ? " (subtractive decode)" : "");
pci_read_config_word(bridge, PCI_IO_BASE, &io);
if (!io) {
pci_write_config_word(bridge, PCI_IO_BASE, 0xe0f0);
pci_read_config_word(bridge, PCI_IO_BASE, &io);
pci_write_config_word(bridge, PCI_IO_BASE, 0x0);
}
if (io) {
bridge->io_window = 1;
pci_read_bridge_io(bridge, &res, true);
}
pci_read_bridge_mmio(bridge, &res, true);
/*
* DECchip 21050 pass 2 errata: the bridge may miss an address
* disconnect boundary by one PCI data phase. Workaround: do not
* use prefetching on this device.
*/
if (bridge->vendor == PCI_VENDOR_ID_DEC && bridge->device == 0x0001)
return;
pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
if (!pmem) {
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE,
0xffe0fff0);
pci_read_config_dword(bridge, PCI_PREF_MEMORY_BASE, &pmem);
pci_write_config_dword(bridge, PCI_PREF_MEMORY_BASE, 0x0);
}
if (!pmem)
return;
bridge->pref_window = 1;
if ((pmem & PCI_PREF_RANGE_TYPE_MASK) == PCI_PREF_RANGE_TYPE_64) {
/*
* Bridge claims to have a 64-bit prefetchable memory
* window; verify that the upper bits are actually
* writable.
*/
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &pmem);
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32,
0xffffffff);
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32, &tmp);
pci_write_config_dword(bridge, PCI_PREF_BASE_UPPER32, pmem);
if (tmp)
bridge->pref_64_window = 1;
}
pci_read_bridge_mmio_pref(bridge, &res, true);
}
void pci_read_bridge_bases(struct pci_bus *child)
{
struct pci_dev *dev = child->self;
struct resource *res;
int i;
if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
return;
pci_info(dev, "PCI bridge to %pR%s\n",
&child->busn_res,
dev->transparent ? " (subtractive decode)" : "");
pci_bus_remove_resources(child);
for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
pci_read_bridge_io(child->self, child->resource[0], false);
pci_read_bridge_mmio(child->self, child->resource[1], false);
pci_read_bridge_mmio_pref(child->self, child->resource[2], false);
if (!dev->transparent)
return;
pci_bus_for_each_resource(child->parent, res) {
if (!res || !res->flags)
continue;
pci_bus_add_resource(child, res);
pci_info(dev, " bridge window %pR (subtractive decode)\n", res);
}
}
static struct pci_bus *pci_alloc_bus(struct pci_bus *parent)
{
struct pci_bus *b;
b = kzalloc(sizeof(*b), GFP_KERNEL);
if (!b)
return NULL;
INIT_LIST_HEAD(&b->node);
INIT_LIST_HEAD(&b->children);
INIT_LIST_HEAD(&b->devices);
INIT_LIST_HEAD(&b->slots);
INIT_LIST_HEAD(&b->resources);
b->max_bus_speed = PCI_SPEED_UNKNOWN;
b->cur_bus_speed = PCI_SPEED_UNKNOWN;
#ifdef CONFIG_PCI_DOMAINS_GENERIC
if (parent)
b->domain_nr = parent->domain_nr;
#endif
return b;
}
static void pci_release_host_bridge_dev(struct device *dev)
{
struct pci_host_bridge *bridge = to_pci_host_bridge(dev);
if (bridge->release_fn)
bridge->release_fn(bridge);
pci_free_resource_list(&bridge->windows);
pci_free_resource_list(&bridge->dma_ranges);
kfree(bridge);
}
static void pci_init_host_bridge(struct pci_host_bridge *bridge)
{
INIT_LIST_HEAD(&bridge->windows);
INIT_LIST_HEAD(&bridge->dma_ranges);
/*
* We assume we can manage these PCIe features. Some systems may
* reserve these for use by the platform itself, e.g., an ACPI BIOS
* may implement its own AER handling and use _OSC to prevent the
* OS from interfering.
*/
bridge->native_aer = 1;
bridge->native_pcie_hotplug = 1;
bridge->native_shpc_hotplug = 1;
bridge->native_pme = 1;
bridge->native_ltr = 1;
bridge->native_dpc = 1;
bridge->domain_nr = PCI_DOMAIN_NR_NOT_SET;
bridge->native_cxl_error = 1;
device_initialize(&bridge->dev);
}
struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
{
struct pci_host_bridge *bridge;
bridge = kzalloc(sizeof(*bridge) + priv, GFP_KERNEL);
if (!bridge)
return NULL;
pci_init_host_bridge(bridge);
bridge->dev.release = pci_release_host_bridge_dev;
return bridge;
}
EXPORT_SYMBOL(pci_alloc_host_bridge);
static void devm_pci_alloc_host_bridge_release(void *data)
{
pci_free_host_bridge(data);
}
struct pci_host_bridge *devm_pci_alloc_host_bridge(struct device *dev,
size_t priv)
{
int ret;
struct pci_host_bridge *bridge;
bridge = pci_alloc_host_bridge(priv);
if (!bridge)
return NULL;
bridge->dev.parent = dev;
ret = devm_add_action_or_reset(dev, devm_pci_alloc_host_bridge_release,
bridge);
if (ret)
return NULL;
ret = devm_of_pci_bridge_init(dev, bridge);
if (ret)
return NULL;
return bridge;
}
EXPORT_SYMBOL(devm_pci_alloc_host_bridge);
void pci_free_host_bridge(struct pci_host_bridge *bridge)
{
put_device(&bridge->dev);
}
EXPORT_SYMBOL(pci_free_host_bridge);
/* Indexed by PCI_X_SSTATUS_FREQ (secondary bus mode and frequency) */
static const unsigned char pcix_bus_speed[] = {
PCI_SPEED_UNKNOWN, /* 0 */
PCI_SPEED_66MHz_PCIX, /* 1 */
PCI_SPEED_100MHz_PCIX, /* 2 */
PCI_SPEED_133MHz_PCIX, /* 3 */
PCI_SPEED_UNKNOWN, /* 4 */
PCI_SPEED_66MHz_PCIX_ECC, /* 5 */
PCI_SPEED_100MHz_PCIX_ECC, /* 6 */
PCI_SPEED_133MHz_PCIX_ECC, /* 7 */
PCI_SPEED_UNKNOWN, /* 8 */
PCI_SPEED_66MHz_PCIX_266, /* 9 */
PCI_SPEED_100MHz_PCIX_266, /* A */
PCI_SPEED_133MHz_PCIX_266, /* B */
PCI_SPEED_UNKNOWN, /* C */
PCI_SPEED_66MHz_PCIX_533, /* D */
PCI_SPEED_100MHz_PCIX_533, /* E */
PCI_SPEED_133MHz_PCIX_533 /* F */
};
/* Indexed by PCI_EXP_LNKCAP_SLS, PCI_EXP_LNKSTA_CLS */
const unsigned char pcie_link_speed[] = {
PCI_SPEED_UNKNOWN, /* 0 */
PCIE_SPEED_2_5GT, /* 1 */
PCIE_SPEED_5_0GT, /* 2 */
PCIE_SPEED_8_0GT, /* 3 */
PCIE_SPEED_16_0GT, /* 4 */
PCIE_SPEED_32_0GT, /* 5 */
PCIE_SPEED_64_0GT, /* 6 */
PCI_SPEED_UNKNOWN, /* 7 */
PCI_SPEED_UNKNOWN, /* 8 */
PCI_SPEED_UNKNOWN, /* 9 */
PCI_SPEED_UNKNOWN, /* A */
PCI_SPEED_UNKNOWN, /* B */
PCI_SPEED_UNKNOWN, /* C */
PCI_SPEED_UNKNOWN, /* D */
PCI_SPEED_UNKNOWN, /* E */
PCI_SPEED_UNKNOWN /* F */
};
EXPORT_SYMBOL_GPL(pcie_link_speed);
const char *pci_speed_string(enum pci_bus_speed speed)
{
/* Indexed by the pci_bus_speed enum */
static const char *speed_strings[] = {
"33 MHz PCI", /* 0x00 */
"66 MHz PCI", /* 0x01 */
"66 MHz PCI-X", /* 0x02 */
"100 MHz PCI-X", /* 0x03 */
"133 MHz PCI-X", /* 0x04 */
NULL, /* 0x05 */
NULL, /* 0x06 */
NULL, /* 0x07 */
NULL, /* 0x08 */
"66 MHz PCI-X 266", /* 0x09 */
"100 MHz PCI-X 266", /* 0x0a */
"133 MHz PCI-X 266", /* 0x0b */
"Unknown AGP", /* 0x0c */
"1x AGP", /* 0x0d */
"2x AGP", /* 0x0e */
"4x AGP", /* 0x0f */
"8x AGP", /* 0x10 */
"66 MHz PCI-X 533", /* 0x11 */
"100 MHz PCI-X 533", /* 0x12 */
"133 MHz PCI-X 533", /* 0x13 */
"2.5 GT/s PCIe", /* 0x14 */
"5.0 GT/s PCIe", /* 0x15 */
"8.0 GT/s PCIe", /* 0x16 */
"16.0 GT/s PCIe", /* 0x17 */
"32.0 GT/s PCIe", /* 0x18 */
"64.0 GT/s PCIe", /* 0x19 */
};
if (speed < ARRAY_SIZE(speed_strings))
return speed_strings[speed];
return "Unknown";
}
EXPORT_SYMBOL_GPL(pci_speed_string);
void pcie_update_link_speed(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
u16 linksta, linksta2;
pcie_capability_read_word(bridge, PCI_EXP_LNKSTA, &linksta);
pcie_capability_read_word(bridge, PCI_EXP_LNKSTA2, &linksta2);
__pcie_update_link_speed(bus, linksta, linksta2);
}
EXPORT_SYMBOL_GPL(pcie_update_link_speed);
static unsigned char agp_speeds[] = {
AGP_UNKNOWN,
AGP_1X,
AGP_2X,
AGP_4X,
AGP_8X
};
static enum pci_bus_speed agp_speed(int agp3, int agpstat)
{
int index = 0;
if (agpstat & 4)
index = 3;
else if (agpstat & 2)
index = 2;
else if (agpstat & 1)
index = 1;
else
goto out;
if (agp3) {
index += 2;
if (index == 5)
index = 0;
}
out:
return agp_speeds[index];
}
static void pci_set_bus_speed(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
int pos;
pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
if (!pos)
pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
if (pos) {
u32 agpstat, agpcmd;
pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
}
pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
if (pos) {
u16 status;
enum pci_bus_speed max;
pci_read_config_word(bridge, pos + PCI_X_BRIDGE_SSTATUS,
&status);
if (status & PCI_X_SSTATUS_533MHZ) {
max = PCI_SPEED_133MHz_PCIX_533;
} else if (status & PCI_X_SSTATUS_266MHZ) {
max = PCI_SPEED_133MHz_PCIX_266;
} else if (status & PCI_X_SSTATUS_133MHZ) {
if ((status & PCI_X_SSTATUS_VERS) == PCI_X_SSTATUS_V2)
max = PCI_SPEED_133MHz_PCIX_ECC;
else
max = PCI_SPEED_133MHz_PCIX;
} else {
max = PCI_SPEED_66MHz_PCIX;
}
bus->max_bus_speed = max;
bus->cur_bus_speed =
pcix_bus_speed[FIELD_GET(PCI_X_SSTATUS_FREQ, status)];
return;
}
if (pci_is_pcie(bridge)) {
u32 linkcap;
pcie_capability_read_dword(bridge, PCI_EXP_LNKCAP, &linkcap);
bus->max_bus_speed = pcie_link_speed[linkcap & PCI_EXP_LNKCAP_SLS];
pcie_update_link_speed(bus);
}
}
static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
{
struct irq_domain *d;
/* If the host bridge driver sets a MSI domain of the bridge, use it */
d = dev_get_msi_domain(bus->bridge);
/*
* Any firmware interface that can resolve the msi_domain
* should be called from here.
*/
if (!d)
d = pci_host_bridge_of_msi_domain(bus);
if (!d)
d = pci_host_bridge_acpi_msi_domain(bus);
/*
* If no IRQ domain was found via the OF tree, try looking it up
* directly through the fwnode_handle.
*/
if (!d) {
struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
if (fwnode)
d = irq_find_matching_fwnode(fwnode,
DOMAIN_BUS_PCI_MSI);
}
return d;
}
static void pci_set_bus_msi_domain(struct pci_bus *bus)
{
struct irq_domain *d;
struct pci_bus *b;
/*
* The bus can be a root bus, a subordinate bus, or a virtual bus
* created by an SR-IOV device. Walk up to the first bridge device
* found or derive the domain from the host bridge.
*/
for (b = bus, d = NULL; !d && !pci_is_root_bus(b); b = b->parent) {
if (b->self)
d = dev_get_msi_domain(&b->self->dev);
}
if (!d)
d = pci_host_bridge_msi_domain(b);
dev_set_msi_domain(&bus->dev, d);
}
static bool pci_preserve_config(struct pci_host_bridge *host_bridge)
{
if (pci_acpi_preserve_config(host_bridge))
return true;
if (host_bridge->dev.parent && host_bridge->dev.parent->of_node)
return of_pci_preserve_config(host_bridge->dev.parent->of_node);
return false;
}
static int pci_register_host_bridge(struct pci_host_bridge *bridge)
{
struct device *parent = bridge->dev.parent;
struct resource_entry *window, *next, *n;
struct pci_bus *bus, *b;
resource_size_t offset, next_offset;
LIST_HEAD(resources);
struct resource *res, *next_res;
bool bus_registered = false;
char addr[64], *fmt;
const char *name;
int err;
bus = pci_alloc_bus(NULL);
if (!bus)
return -ENOMEM;
bridge->bus = bus;
bus->sysdata = bridge->sysdata;
bus->ops = bridge->ops;
bus->number = bus->busn_res.start = bridge->busnr;
#ifdef CONFIG_PCI_DOMAINS_GENERIC
if (bridge->domain_nr == PCI_DOMAIN_NR_NOT_SET)
bus->domain_nr = pci_bus_find_domain_nr(bus, parent);
else
bus->domain_nr = bridge->domain_nr;
if (bus->domain_nr < 0) {
err = bus->domain_nr;
goto free;
}
#endif
b = pci_find_bus(pci_domain_nr(bus), bridge->busnr);
if (b) {
/* Ignore it if we already got here via a different bridge */
dev_dbg(&b->dev, "bus already known\n");
err = -EEXIST;
goto free;
}
dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(bus),
bridge->busnr);
err = pcibios_root_bridge_prepare(bridge);
if (err)
goto free;
/* Temporarily move resources off the list */