Commit 7bd1c365 authored by Mike Habeck's avatar Mike Habeck Committed by Jesse Barnes
Browse files

x86/PCI: Add option to not assign BAR's if not already assigned 



The Linux kernel assigns BARs that a BIOS did not assign, most likely
to handle broken BIOSes that didn't enumerate the devices correctly.
On UV the BIOS purposely doesn't assign I/O BARs for certain devices/
drivers we know don't use them (examples, LSI SAS, Qlogic FC, ...).
We purposely don't assign these I/O BARs because I/O Space is a very
limited resource.  There is only 64k of I/O Space, and in a PCIe
topology that space gets divided up into 4k chucks (this is due to
the fact that a pci-to-pci bridge's I/O decoder is aligned at 4k)...
Thus a system can have at most 16 cards with I/O BARs: (64k / 4k = 16)

SGI needs to scale to >16 devices with I/O BARs.  So by not assigning
I/O BARs on devices we know don't use them, we can do that (iff the
kernel doesn't go and assign these BARs that the BIOS purposely didn't
assign).

This patch will not assign a resource to a device BAR if that BAR was
not assigned by the BIOS, and the kernel cmdline option 'pci=nobar'
was specified.   This patch is closely modeled after the 'pci=norom'
option that currently exists in the tree.

Signed-off-by: default avatarMike Habeck <habeck@sgi.com>
Signed-off-by: default avatarMike Travis <travis@sgi.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 549e1561

Documentation/kernel-parameters.txt

+2 −0
Original line number Diff line number Diff line
@@ -1970,6 +1970,8 @@ and is between 256 and 4096 characters. It is defined in the file 
		norom		[X86] Do not assign address space to

				expansion ROMs that do not already have

				BIOS assigned address ranges.

		nobar		[X86] Do not assign address space to the

				BARs that weren't assigned by the BIOS.

		irqmask=0xMMMM	[X86] Set a bit mask of IRQs allowed to be

				assigned automatically to PCI devices. You can

				make the kernel exclude IRQs of your ISA cards

arch/x86/include/asm/pci_x86.h

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#define PCI_HAS_IO_ECS		0x40000

#define PCI_NOASSIGN_ROMS	0x80000

#define PCI_ROOT_NO_CRS		0x100000

#define PCI_NOASSIGN_BARS	0x200000



extern unsigned int pci_probe;

extern unsigned long pirq_table_addr;

arch/x86/pci/common.c

+20 −0
Original line number Diff line number Diff line
@@ -125,6 +125,23 @@ void __init dmi_check_skip_isa_align(void) 
static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)

{

	struct resource *rom_r = &dev->resource[PCI_ROM_RESOURCE];

	struct resource *bar_r;

	int bar;



	if (pci_probe & PCI_NOASSIGN_BARS) {

		/*

		* If the BIOS did not assign the BAR, zero out the

		* resource so the kernel doesn't attmept to assign

		* it later on in pci_assign_unassigned_resources

		*/

		for (bar = 0; bar <= PCI_STD_RESOURCE_END; bar++) {

			bar_r = &dev->resource[bar];

			if (bar_r->start == 0 && bar_r->end != 0) {

				bar_r->flags = 0;

				bar_r->end = 0;

			}

		}

	}



	if (pci_probe & PCI_NOASSIGN_ROMS) {

		if (rom_r->parent)
@@ -509,6 +526,9 @@ char * __devinit pcibios_setup(char *str) 
	} else if (!strcmp(str, "norom")) {

		pci_probe |= PCI_NOASSIGN_ROMS;

		return NULL;

	} else if (!strcmp(str, "nobar")) {

		pci_probe |= PCI_NOASSIGN_BARS;

		return NULL;

	} else if (!strcmp(str, "assign-busses")) {

		pci_probe |= PCI_ASSIGN_ALL_BUSSES;

		return NULL;

CRA Git | Maintained and supported by SUSTech CRA and CCSE