#include <linux/pci.h>
#include <linux/init.h>
#include <linux/acpi.h>
+#include <linux/dmi.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, 32);
+static DECLARE_BITMAP(fallback_slots, MAX_CHECK_BUS*32);
/*
* Functions for accessing PCI configuration space with MMCONFIG accesses
int cfg_num = -1;
struct acpi_table_mcfg_config *cfg;
- if (seg == 0 && bus == 0 &&
- test_bit(PCI_SLOT(devfn), fallback_slots))
+ if (seg == 0 && bus < MAX_CHECK_BUS &&
+ test_bit(PCI_SLOT(devfn) + 32*bus, fallback_slots))
return 0;
while (1) {
++cfg_num;
if (cfg_num >= pci_mmcfg_config_num) {
- /* Not found - fallback to type 1 */
- return 0;
+ break;
}
cfg = &pci_mmcfg_config[cfg_num];
if (cfg->pci_segment_group_number != seg)
(cfg->end_bus_number >= bus))
return cfg->base_address;
}
+
+ /* Handle more broken MCFG tables on Asus etc.
+ They only contain a single entry for bus 0-0. Assume
+ this applies to all busses. */
+ cfg = &pci_mmcfg_config[0];
+ if (pci_mmcfg_config_num == 1 &&
+ cfg->pci_segment_group_number == 0 &&
+ (cfg->start_bus_number | cfg->end_bus_number) == 0)
+ return cfg->base_address;
+
+ /* Fall back to type 0 */
+ return 0;
}
static inline void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)
unsigned long flags;
u32 base;
- if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
+ if ((bus > 255) || (devfn > 255) || (reg > 4095)) {
+ *value = -1;
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.
- We only do this for bus 0/seg 0 */
+ and fallback for them. */
static __init void unreachable_devices(void)
{
- int i;
+ int i, k;
unsigned long 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 *)addr) != val1)
- set_bit(i, fallback_slots);
- spin_unlock_irqrestore(&pci_config_lock, 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 + 32*k, fallback_slots);
+ printk(KERN_NOTICE
+ "PCI: No mmconfig possible on %x:%x\n", k, i);
+ }
+ spin_unlock_irqrestore(&pci_config_lock, flags);
+ }
}
}
-static int __init pci_mmcfg_init(void)
+static int disable_mcfg(struct dmi_system_id *d)
{
- if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- goto out;
+ printk("PCI: %s detected. Disabling MCFG.\n", d->ident);
+ pci_probe &= ~PCI_PROBE_MMCONF;
+ return 0;
+}
+
+static struct dmi_system_id __initdata dmi_bad_mcfg[] = {
+ /* Has broken MCFG table that makes the system hang when used */
+ {
+ .callback = disable_mcfg,
+ .ident = "Intel D3C5105 SDV",
+ .matches = {
+ DMI_MATCH(DMI_BIOS_VENDOR, "Intel"),
+ DMI_MATCH(DMI_BOARD_NAME, "D26928"),
+ },
+ },
+ {}
+};
+
+void __init pci_mmcfg_init(void)
+{
+ dmi_check_system(dmi_bad_mcfg);
+
+ if ((pci_probe & (PCI_PROBE_MMCONF_FORCE|PCI_PROBE_MMCONF)) == 0)
+ return;
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))
- goto out;
+ return;
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);
git.openpandora.org / pandora-kernel.git / blobdiff