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Diffstat (limited to 'arch/i386/pci/mmconfig.c')
-rw-r--r--arch/i386/pci/mmconfig.c45
1 files changed, 42 insertions, 3 deletions
diff --git a/arch/i386/pci/mmconfig.c b/arch/i386/pci/mmconfig.c
index cc787a7c030..08a08490121 100644
--- a/arch/i386/pci/mmconfig.c
+++ b/arch/i386/pci/mmconfig.c
@@ -19,14 +19,20 @@
/* The base address of the last MMCONFIG device accessed */
static u32 mmcfg_last_accessed_device;
+static DECLARE_BITMAP(fallback_slots, 32);
+
/*
* Functions for accessing PCI configuration space with MMCONFIG accesses
*/
-static u32 get_base_addr(unsigned int seg, int bus)
+static u32 get_base_addr(unsigned int seg, int bus, unsigned devfn)
{
int cfg_num = -1;
struct acpi_table_mcfg_config *cfg;
+ if (seg == 0 && bus == 0 &&
+ test_bit(PCI_SLOT(devfn), fallback_slots))
+ return 0;
+
while (1) {
++cfg_num;
if (cfg_num >= pci_mmcfg_config_num) {
@@ -60,7 +66,7 @@ static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
if (!value || (bus > 255) || (devfn > 255) || (reg > 4095))
return -EINVAL;
- base = get_base_addr(seg, bus);
+ base = get_base_addr(seg, bus, devfn);
if (!base)
return pci_conf1_read(seg,bus,devfn,reg,len,value);
@@ -94,7 +100,7 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
if ((bus > 255) || (devfn > 255) || (reg > 4095))
return -EINVAL;
- base = get_base_addr(seg, bus);
+ base = get_base_addr(seg, bus, devfn);
if (!base)
return pci_conf1_write(seg,bus,devfn,reg,len,value);
@@ -124,6 +130,37 @@ static struct pci_raw_ops pci_mmcfg = {
.write = pci_mmcfg_write,
};
+/* K8 systems have some devices (typically in the builtin northbridge)
+ that are only accessible using type1
+ 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 */
+static __init void unreachable_devices(void)
+{
+ int i;
+ 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);
+ }
+}
+
static int __init pci_mmcfg_init(void)
{
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
@@ -139,6 +176,8 @@ static int __init pci_mmcfg_init(void)
raw_pci_ops = &pci_mmcfg;
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
+ unreachable_devices();
+
out:
return 0;
}