#include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>
-#include <asm/e820.h>
#include "pci.h"
-/* aperture is up to 256MB but BIOS may reserve less */
-#define MMCONFIG_APER_MIN (2 * 1024*1024)
-#define MMCONFIG_APER_MAX (256 * 1024*1024)
-
-/* Assume systems with more busses have correct MCFG */
-#define MAX_CHECK_BUS 16
-
#define mmcfg_virt_addr ((void __iomem *) fix_to_virt(FIX_PCIE_MCFG))
/* The base address of the last MMCONFIG device accessed */
static u32 mmcfg_last_accessed_device;
-static DECLARE_BITMAP(fallback_slots, MAX_CHECK_BUS*32);
+static DECLARE_BITMAP(fallback_slots, 32);
/*
* Functions for accessing PCI configuration space with MMCONFIG accesses
int cfg_num = -1;
struct acpi_table_mcfg_config *cfg;
- if (seg == 0 && bus < MAX_CHECK_BUS &&
- test_bit(PCI_SLOT(devfn) + 32*bus, fallback_slots))
+ if (seg == 0 && bus == 0 &&
+ test_bit(PCI_SLOT(devfn), fallback_slots))
return 0;
while (1) {
unsigned long flags;
u32 base;
- if ((bus > 255) || (devfn > 255) || (reg > 4095)) {
- *value = -1;
+ if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
return -EINVAL;
- }
base = get_base_addr(seg, bus, devfn);
if (!base)
Normally this can be expressed in the MCFG by not listing them
and assigning suitable _SEGs, but this isn't implemented in some BIOS.
Instead try to discover all devices on bus 0 that are unreachable using MM
- and fallback for them. */
+ and fallback for them.
+ We only do this for bus 0/seg 0 */
static __init void unreachable_devices(void)
{
- int i, k;
+ int i;
unsigned long flags;
- for (k = 0; k < MAX_CHECK_BUS; k++) {
- for (i = 0; i < 32; i++) {
- u32 val1;
- u32 addr;
-
- pci_conf1_read(0, k, PCI_DEVFN(i, 0), 0, 4, &val1);
- if (val1 == 0xffffffff)
- continue;
-
- /* Locking probably not needed, but safer */
- spin_lock_irqsave(&pci_config_lock, flags);
- addr = get_base_addr(0, k, PCI_DEVFN(i, 0));
- if (addr != 0)
- pci_exp_set_dev_base(addr, k, PCI_DEVFN(i, 0));
- if (addr == 0 ||
- readl((u32 __iomem *)mmcfg_virt_addr) != val1) {
- set_bit(i, fallback_slots);
- printk(KERN_NOTICE
- "PCI: No mmconfig possible on %x:%x\n", k, i);
- }
- spin_unlock_irqrestore(&pci_config_lock, flags);
- }
+ for (i = 0; i < 32; i++) {
+ u32 val1;
+ u32 addr;
+
+ pci_conf1_read(0, 0, PCI_DEVFN(i, 0), 0, 4, &val1);
+ if (val1 == 0xffffffff)
+ continue;
+
+ /* Locking probably not needed, but safer */
+ spin_lock_irqsave(&pci_config_lock, flags);
+ addr = get_base_addr(0, 0, PCI_DEVFN(i, 0));
+ if (addr != 0)
+ pci_exp_set_dev_base(addr, 0, PCI_DEVFN(i, 0));
+ if (addr == 0 || readl((u32 __iomem *)mmcfg_virt_addr) != val1)
+ set_bit(i, fallback_slots);
+ spin_unlock_irqrestore(&pci_config_lock, flags);
}
}
-void __init pci_mmcfg_init(void)
+static int __init pci_mmcfg_init(void)
{
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- return;
+ goto out;
acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
if ((pci_mmcfg_config_num == 0) ||
(pci_mmcfg_config == NULL) ||
(pci_mmcfg_config[0].base_address == 0))
- return;
-
- if (!e820_all_mapped(pci_mmcfg_config[0].base_address,
- pci_mmcfg_config[0].base_address + MMCONFIG_APER_MIN,
- E820_RESERVED)) {
- printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %x is not E820-reserved\n",
- pci_mmcfg_config[0].base_address);
- printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
- return;
- }
+ goto out;
printk(KERN_INFO "PCI: Using MMCONFIG\n");
raw_pci_ops = &pci_mmcfg;
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
unreachable_devices();
+
+ out:
+ return 0;
}
+
+arch_initcall(pci_mmcfg_init);