Commit 79e453d4 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Revert mmiocfg heuristics and blacklist changes 



This reverts commits 11012d41 and
40dd2d20, which allowed us to use the
MMIO accesses for PCI config cycles even without the area being marked
reserved in the e820 memory tables.

Those changes were needed for EFI-environment Intel macs, but broke some
newer Intel 965 boards, so for now it's better to revert to our old
2.6.17 behaviour and at least avoid introducing any new breakage.

Andi Kleen has a set of patches that work with both EFI and the broken
Intel 965 boards, which will be applied once they get wider testing.

Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Edgar Hucek <hostmaster@ed-soft.at>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ab5cfd2a

Documentation/kernel-parameters.txt

+0 −2
Original line number Diff line number Diff line
@@ -1189,8 +1189,6 @@ running once the system is up. 
				Mechanism 2.

		nommconf	[IA-32,X86_64] Disable use of MMCONFIG for PCI

				Configuration

		mmconf		[IA-32,X86_64] Force MMCONFIG. This is useful

				to override the builtin blacklist.

		nomsi		[MSI] If the PCI_MSI kernel config parameter is

				enabled, this kernel boot option can be used to

				disable the use of MSI interrupts system-wide.

arch/i386/kernel/setup.c

+32 −0
Original line number Diff line number Diff line
@@ -956,6 +956,38 @@ efi_memory_present_wrapper(unsigned long start, unsigned long end, void *arg) 
	return 0;

}



 /*

  * This function checks if the entire range <start,end> is mapped with type.

  *

  * Note: this function only works correct if the e820 table is sorted and

  * not-overlapping, which is the case

  */

int __init

e820_all_mapped(unsigned long s, unsigned long e, unsigned type)

{

	u64 start = s;

	u64 end = e;

	int i;

	for (i = 0; i < e820.nr_map; i++) {

		struct e820entry *ei = &e820.map[i];

		if (type && ei->type != type)

			continue;

		/* is the region (part) in overlap with the current region ?*/

		if (ei->addr >= end || ei->addr + ei->size <= start)

			continue;

		/* if the region is at the beginning of <start,end> we move

		 * start to the end of the region since it's ok until there

		 */

		if (ei->addr <= start)

			start = ei->addr + ei->size;

		/* if start is now at or beyond end, we're done, full

		 * coverage */

		if (start >= end)

			return 1; /* we're done */

	}

	return 0;

}



/*

 * Find the highest page frame number we have available

 */

arch/i386/pci/common.c

+0 −5
Original line number Diff line number Diff line
@@ -237,11 +237,6 @@ char * __devinit pcibios_setup(char *str) 
		pci_probe &= ~PCI_PROBE_MMCONF;

		return NULL;

	}

	/* override DMI blacklist */

	else if (!strcmp(str, "mmconf")) {

		pci_probe |= PCI_PROBE_MMCONF_FORCE;

		return NULL;

	}

#endif

	else if (!strcmp(str, "noacpi")) {

		acpi_noirq_set();

arch/i386/pci/mmconfig.c

+10 −24
Original line number Diff line number Diff line
@@ -12,7 +12,6 @@ 
#include <linux/pci.h>

#include <linux/init.h>

#include <linux/acpi.h>

#include <linux/dmi.h>

#include <asm/e820.h>

#include "pci.h"
@@ -188,31 +187,9 @@ static __init void unreachable_devices(void) 
	}

}



static int disable_mcfg(struct dmi_system_id *d)

{

	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)

	if ((pci_probe & PCI_PROBE_MMCONF) == 0)

		return;



	acpi_table_parse(ACPI_MCFG, acpi_parse_mcfg);
@@ -221,6 +198,15 @@ void __init pci_mmcfg_init(void) 
	    (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;

	}



	printk(KERN_INFO "PCI: Using MMCONFIG\n");

	raw_pci_ops = &pci_mmcfg;

	pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;

arch/i386/pci/pci.h

+1 −2
Original line number Diff line number Diff line
@@ -16,8 +16,7 @@ 
#define PCI_PROBE_CONF1		0x0002

#define PCI_PROBE_CONF2		0x0004

#define PCI_PROBE_MMCONF	0x0008

#define PCI_PROBE_MMCONF_FORCE	0x0010

#define PCI_PROBE_MASK		0x00ff

#define PCI_PROBE_MASK		0x000f



#define PCI_NO_SORT		0x0100

#define PCI_BIOS_SORT		0x0200

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