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Commit 613e7ed6 authored by Yu Zhao's avatar Yu Zhao Committed by Jesse Barnes
Browse files

PCI: add a new function to map BAR offsets 



Add a function to map a given resource number to a corresponding
register so drivers can get the offset and type of device specific BARs.

Signed-off-by: default avatarYu Zhao <yu.zhao@intel.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 3789fa8a

drivers/pci/pci.c

+22 −0
Original line number Diff line number Diff line
@@ -2201,6 +2201,28 @@ int pci_select_bars(struct pci_dev *dev, unsigned long flags) 
	return bars;

}



/**

 * pci_resource_bar - get position of the BAR associated with a resource

 * @dev: the PCI device

 * @resno: the resource number

 * @type: the BAR type to be filled in

 *

 * Returns BAR position in config space, or 0 if the BAR is invalid.

 */

int pci_resource_bar(struct pci_dev *dev, int resno, enum pci_bar_type *type)

{

	if (resno < PCI_ROM_RESOURCE) {

		*type = pci_bar_unknown;

		return PCI_BASE_ADDRESS_0 + 4 * resno;

	} else if (resno == PCI_ROM_RESOURCE) {

		*type = pci_bar_mem32;

		return dev->rom_base_reg;

	}



	dev_err(&dev->dev, "BAR: invalid resource #%d\n", resno);

	return 0;

}



static void __devinit pci_no_domains(void)

{

#ifdef CONFIG_PCI_DOMAINS

drivers/pci/pci.h

+2 −0
Original line number Diff line number Diff line
@@ -171,6 +171,8 @@ enum pci_bar_type { 


extern int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,

				struct resource *res, unsigned int reg);

extern int pci_resource_bar(struct pci_dev *dev, int resno,

			    enum pci_bar_type *type);

extern void pci_enable_ari(struct pci_dev *dev);

/**

 * pci_ari_enabled - query ARI forwarding status

drivers/pci/setup-res.c

+5 −8
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ void pci_update_resource(struct pci_dev *dev, int resno) 
	struct pci_bus_region region;

	u32 new, check, mask;

	int reg;

	enum pci_bar_type type;

	struct resource *res = dev->resource + resno;



	/*
@@ -62,17 +63,13 @@ void pci_update_resource(struct pci_dev *dev, int resno) 
	else

		mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;



	if (resno < 6) {

		reg = PCI_BASE_ADDRESS_0 + 4 * resno;

	} else if (resno == PCI_ROM_RESOURCE) {

	reg = pci_resource_bar(dev, resno, &type);

	if (!reg)

		return;

	if (type != pci_bar_unknown) {

		if (!(res->flags & IORESOURCE_ROM_ENABLE))

			return;

		new |= PCI_ROM_ADDRESS_ENABLE;

		reg = dev->rom_base_reg;

	} else {

		/* Hmm, non-standard resource. */

	

		return;		/* kill uninitialised var warning */

	}



	pci_write_config_dword(dev, reg, new);