b78673944b
i386 and x86-64 pci mmconfig code have a lot in common. So share what's shareable between the two. Signed-off-by: Olivier Galibert <galibert@pobox.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org>
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/*
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* mmconfig-shared.c - Low-level direct PCI config space access via
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* MMCONFIG - common code between i386 and x86-64.
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*
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* This code does:
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* - ACPI decoding and validation
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*
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* Per-architecture code takes care of the mappings and accesses
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* themselves.
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*/
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <linux/bitmap.h>
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#include <asm/e820.h>
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#include "pci.h"
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/* aperture is up to 256MB but BIOS may reserve less */
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#define MMCONFIG_APER_MIN (2 * 1024*1024)
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#define MMCONFIG_APER_MAX (256 * 1024*1024)
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/* Verify the first 16 busses. We assume that systems with more busses
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get MCFG right. */
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#define PCI_MMCFG_MAX_CHECK_BUS 16
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DECLARE_BITMAP(pci_mmcfg_fallback_slots, 32*PCI_MMCFG_MAX_CHECK_BUS);
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/* K8 systems have some devices (typically in the builtin northbridge)
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that are only accessible using type1
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Normally this can be expressed in the MCFG by not listing them
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and assigning suitable _SEGs, but this isn't implemented in some BIOS.
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Instead try to discover all devices on bus 0 that are unreachable using MM
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and fallback for them. */
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static __init void unreachable_devices(void)
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{
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int i, k;
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/* Use the max bus number from ACPI here? */
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for (k = 0; k < PCI_MMCFG_MAX_CHECK_BUS; k++) {
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for (i = 0; i < 32; i++) {
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u32 val1, val2;
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pci_conf1_read(0, k, PCI_DEVFN(i,0), 0, 4, &val1);
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if (val1 == 0xffffffff)
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continue;
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raw_pci_ops->read(0, k, PCI_DEVFN(i, 0), 0, 4, &val2);
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if (val1 != val2) {
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set_bit(i + 32*k, pci_mmcfg_fallback_slots);
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printk(KERN_NOTICE "PCI: No mmconfig possible"
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" on device %02x:%02x\n", k, i);
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}
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}
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}
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}
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void __init pci_mmcfg_init(int type)
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{
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if ((pci_probe & PCI_PROBE_MMCONF) == 0)
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return;
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acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
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if ((pci_mmcfg_config_num == 0) ||
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(pci_mmcfg_config == NULL) ||
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(pci_mmcfg_config[0].address == 0))
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return;
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/* Only do this check when type 1 works. If it doesn't work
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assume we run on a Mac and always use MCFG */
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if (type == 1 &&
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!e820_all_mapped(pci_mmcfg_config[0].address,
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pci_mmcfg_config[0].address + MMCONFIG_APER_MIN,
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E820_RESERVED)) {
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printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not E820-reserved\n",
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pci_mmcfg_config[0].address);
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printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
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return;
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}
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if (pci_mmcfg_arch_init()) {
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unreachable_devices();
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pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
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}
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}
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