#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);
+
/*
* 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 < 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) {
- /* something bad is going on, no cfg table is found. */
- /* so we fall back to the old way we used to do this */
- /* and just rely on the first entry to be correct. */
- return pci_mmcfg_config[0].base_address;
+ 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 seg, int bus, int devfn)
+static inline void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)
{
- u32 dev_base = get_base_addr(seg, bus) | (bus << 20) | (devfn << 12);
+ u32 dev_base = base | (bus << 20) | (devfn << 12);
if (dev_base != mmcfg_last_accessed_device) {
mmcfg_last_accessed_device = dev_base;
set_fixmap_nocache(FIX_PCIE_MCFG, dev_base);
unsigned int devfn, int reg, int len, u32 *value)
{
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)
+ return pci_conf1_read(seg,bus,devfn,reg,len,value);
spin_lock_irqsave(&pci_config_lock, flags);
- pci_exp_set_dev_base(seg, bus, devfn);
+ pci_exp_set_dev_base(base, bus, devfn);
switch (len) {
case 1:
unsigned int devfn, int reg, int len, u32 value)
{
unsigned long flags;
+ u32 base;
if ((bus > 255) || (devfn > 255) || (reg > 4095))
return -EINVAL;
+ base = get_base_addr(seg, bus, devfn);
+ if (!base)
+ return pci_conf1_write(seg,bus,devfn,reg,len,value);
+
spin_lock_irqsave(&pci_config_lock, flags);
- pci_exp_set_dev_base(seg, bus, devfn);
+ pci_exp_set_dev_base(base, bus, devfn);
switch (len) {
case 1:
.write = pci_mmcfg_write,
};
-static int __init pci_mmcfg_init(void)
+
+static __init void pci_mmcfg_insert_resources(void)
+{
+#define PCI_MMCFG_RESOURCE_NAME_LEN 19
+ int i;
+ struct resource *res;
+ char *names;
+ unsigned num_buses;
+
+ res = kcalloc(PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res),
+ pci_mmcfg_config_num, GFP_KERNEL);
+
+ if (!res) {
+ printk(KERN_ERR "PCI: Unable to allocate MMCONFIG resources\n");
+ return;
+ }
+
+ names = (void *)&res[pci_mmcfg_config_num];
+ for (i = 0; i < pci_mmcfg_config_num; i++, res++) {
+ num_buses = pci_mmcfg_config[i].end_bus_number -
+ pci_mmcfg_config[i].start_bus_number + 1;
+ res->name = names;
+ snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u",
+ pci_mmcfg_config[i].pci_segment_group_number);
+ res->start = pci_mmcfg_config[i].base_address;
+ res->end = res->start + (num_buses << 20) - 1;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ insert_resource(&iomem_resource, res);
+ names += PCI_MMCFG_RESOURCE_NAME_LEN;
+ }
+}
+
+/* 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. */
+static __init void unreachable_devices(void)
+{
+ int i, k;
+ 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 + 32*k, fallback_slots);
+ printk(KERN_NOTICE
+ "PCI: No mmconfig possible on %x:%x\n", k, i);
+ }
+ spin_unlock_irqrestore(&pci_config_lock, flags);
+ }
+ }
+}
+
+
+
+void __init pci_mmcfg_init(int type)
{
if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- goto out;
+ 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;
-
- /* Kludge for now. Don't use mmconfig on AMD systems because
- those have some busses where mmconfig doesn't work,
- and we don't parse ACPI MCFG well enough to handle that.
- Remove when proper handling is added. */
- if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD)
- goto out;
+ return;
+
+ /* Only do this check when type 1 works. If it doesn't work
+ assume we run on a Mac and always use MCFG */
+ if (type == 1 && !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;
+ }
printk(KERN_INFO "PCI: Using MMCONFIG\n");
raw_pci_ops = &pci_mmcfg;
pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
- out:
- return 0;
+ unreachable_devices();
+ pci_mmcfg_insert_resources();
}
-
-arch_initcall(pci_mmcfg_init);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff