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Commit 3d137310 authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jesse Barnes
Browse files

PCI: allow quirks to be compiled out 



This patch adds the CONFIG_PCI_QUIRKS option which allows to remove all
the PCI quirks, which are not necessarily used on embedded systems when
PCI is working properly. As this is a size-reduction option, it depends
on CONFIG_EMBEDDED. It allows to save almost 12 kilobytes of kernel
code:

   text	   data	    bss	    dec	    hex	filename
1287806	 123596	 212992	1624394	 18c94a	vmlinux.old
1275854	 123596	 212992	1612442	 189a9a	vmlinux
 -11952       0       0  -11952   -2EB0 +/-

This patch has originally been written by Zwane Mwaikambo
<zwane@arm.linux.org.uk> and is part of the Linux Tiny project.

Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent b41d6cf3

drivers/pci/quirks.c

+90 −86
Original line number Diff line number Diff line
@@ -24,6 +24,14 @@ 
#include <linux/kallsyms.h>

#include "pci.h"



int isa_dma_bridge_buggy;

EXPORT_SYMBOL(isa_dma_bridge_buggy);

int pci_pci_problems;

EXPORT_SYMBOL(pci_pci_problems);

int pcie_mch_quirk;

EXPORT_SYMBOL(pcie_mch_quirk);



#ifdef CONFIG_PCI_QUIRKS

/* The Mellanox Tavor device gives false positive parity errors

 * Mark this device with a broken_parity_status, to allow

 * PCI scanning code to "skip" this now blacklisted device.
@@ -62,8 +70,6 @@ DECLARE_PCI_FIXUP_RESUME(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82441, quirk_p 
    

    This appears to be BIOS not version dependent. So presumably there is a 

    chipset level fix */

int isa_dma_bridge_buggy;

EXPORT_SYMBOL(isa_dma_bridge_buggy);

    

static void __devinit quirk_isa_dma_hangs(struct pci_dev *dev)

{
@@ -84,9 +90,6 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_CBUS_1, quirk_isa_d 
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC,	PCI_DEVICE_ID_NEC_CBUS_2,	quirk_isa_dma_hangs);

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NEC,	PCI_DEVICE_ID_NEC_CBUS_3,	quirk_isa_dma_hangs);



int pci_pci_problems;

EXPORT_SYMBOL(pci_pci_problems);



/*

 *	Chipsets where PCI->PCI transfers vanish or hang

 */
@@ -1362,9 +1365,6 @@ static void __init quirk_alder_ioapic(struct pci_dev *pdev) 
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_EESSC,	quirk_alder_ioapic);

#endif



int pcie_mch_quirk;

EXPORT_SYMBOL(pcie_mch_quirk);



static void __devinit quirk_pcie_mch(struct pci_dev *pdev)

{

	pcie_mch_quirk = 1;
@@ -1555,84 +1555,6 @@ static void __devinit fixup_rev1_53c810(struct pci_dev* dev) 
}

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, fixup_rev1_53c810);



static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f, struct pci_fixup *end)

{

	while (f < end) {

		if ((f->vendor == dev->vendor || f->vendor == (u16) PCI_ANY_ID) &&

 		    (f->device == dev->device || f->device == (u16) PCI_ANY_ID)) {

#ifdef DEBUG

			dev_dbg(&dev->dev, "calling %pF\n", f->hook);

#endif

			f->hook(dev);

		}

		f++;

	}

}



extern struct pci_fixup __start_pci_fixups_early[];

extern struct pci_fixup __end_pci_fixups_early[];

extern struct pci_fixup __start_pci_fixups_header[];

extern struct pci_fixup __end_pci_fixups_header[];

extern struct pci_fixup __start_pci_fixups_final[];

extern struct pci_fixup __end_pci_fixups_final[];

extern struct pci_fixup __start_pci_fixups_enable[];

extern struct pci_fixup __end_pci_fixups_enable[];

extern struct pci_fixup __start_pci_fixups_resume[];

extern struct pci_fixup __end_pci_fixups_resume[];

extern struct pci_fixup __start_pci_fixups_resume_early[];

extern struct pci_fixup __end_pci_fixups_resume_early[];

extern struct pci_fixup __start_pci_fixups_suspend[];

extern struct pci_fixup __end_pci_fixups_suspend[];





void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev)

{

	struct pci_fixup *start, *end;



	switch(pass) {

	case pci_fixup_early:

		start = __start_pci_fixups_early;

		end = __end_pci_fixups_early;

		break;



	case pci_fixup_header:

		start = __start_pci_fixups_header;

		end = __end_pci_fixups_header;

		break;



	case pci_fixup_final:

		start = __start_pci_fixups_final;

		end = __end_pci_fixups_final;

		break;



	case pci_fixup_enable:

		start = __start_pci_fixups_enable;

		end = __end_pci_fixups_enable;

		break;



	case pci_fixup_resume:

		start = __start_pci_fixups_resume;

		end = __end_pci_fixups_resume;

		break;



	case pci_fixup_resume_early:

		start = __start_pci_fixups_resume_early;

		end = __end_pci_fixups_resume_early;

		break;



	case pci_fixup_suspend:

		start = __start_pci_fixups_suspend;

		end = __end_pci_fixups_suspend;

		break;



	default:

		/* stupid compiler warning, you would think with an enum... */

		return;

	}

	pci_do_fixups(dev, start, end);

}

EXPORT_SYMBOL(pci_fixup_device);



/* Enable 1k I/O space granularity on the Intel P64H2 */

static void __devinit quirk_p64h2_1k_io(struct pci_dev *dev)

{
@@ -2006,3 +1928,85 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4375, 
			quirk_msi_intx_disable_bug);



#endif /* CONFIG_PCI_MSI */



static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f, struct pci_fixup *end)

{

	while (f < end) {

		if ((f->vendor == dev->vendor || f->vendor == (u16) PCI_ANY_ID) &&

 		    (f->device == dev->device || f->device == (u16) PCI_ANY_ID)) {

#ifdef DEBUG

			dev_dbg(&dev->dev, "calling ");

			print_fn_descriptor_symbol("%s\n", f->hook);

#endif

			f->hook(dev);

		}

		f++;

	}

}



extern struct pci_fixup __start_pci_fixups_early[];

extern struct pci_fixup __end_pci_fixups_early[];

extern struct pci_fixup __start_pci_fixups_header[];

extern struct pci_fixup __end_pci_fixups_header[];

extern struct pci_fixup __start_pci_fixups_final[];

extern struct pci_fixup __end_pci_fixups_final[];

extern struct pci_fixup __start_pci_fixups_enable[];

extern struct pci_fixup __end_pci_fixups_enable[];

extern struct pci_fixup __start_pci_fixups_resume[];

extern struct pci_fixup __end_pci_fixups_resume[];

extern struct pci_fixup __start_pci_fixups_resume_early[];

extern struct pci_fixup __end_pci_fixups_resume_early[];

extern struct pci_fixup __start_pci_fixups_suspend[];

extern struct pci_fixup __end_pci_fixups_suspend[];





void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev)

{

	struct pci_fixup *start, *end;



	switch(pass) {

	case pci_fixup_early:

		start = __start_pci_fixups_early;

		end = __end_pci_fixups_early;

		break;



	case pci_fixup_header:

		start = __start_pci_fixups_header;

		end = __end_pci_fixups_header;

		break;



	case pci_fixup_final:

		start = __start_pci_fixups_final;

		end = __end_pci_fixups_final;

		break;



	case pci_fixup_enable:

		start = __start_pci_fixups_enable;

		end = __end_pci_fixups_enable;

		break;



	case pci_fixup_resume:

		start = __start_pci_fixups_resume;

		end = __end_pci_fixups_resume;

		break;



	case pci_fixup_resume_early:

		start = __start_pci_fixups_resume_early;

		end = __end_pci_fixups_resume_early;

		break;



	case pci_fixup_suspend:

		start = __start_pci_fixups_suspend;

		end = __end_pci_fixups_suspend;

		break;



	default:

		/* stupid compiler warning, you would think with an enum... */

		return;

	}

	pci_do_fixups(dev, start, end);

}

#else

void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev) {}

#endif

EXPORT_SYMBOL(pci_fixup_device);

init/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -737,6 +737,14 @@ config VM_EVENT_COUNTERS 
	  on EMBEDDED systems.  /proc/vmstat will only show page counts

	  if VM event counters are disabled.



config PCI_QUIRKS

	default y

	bool "Enable PCI quirk workarounds" if EMBEDDED && PCI

	help

	  This enables workarounds for various PCI chipset

          bugs/quirks. Disable this only if your target machine is

          unaffected by PCI quirks.



config SLUB_DEBUG

	default y

	bool "Enable SLUB debugging support" if EMBEDDED