Commit efdc87da authored by Yinghai Lu's avatar Yinghai Lu Committed by Jesse Barnes
Browse files

PCI: Separate pci_bus_read_dev_vendor_id from pci_scan_device 



We can reuse it for pciehp probing.

-v2: according to Kenji, fix crs timeout checking, and export the function
     for later use when pciehp is compiled as a module.

Suggested-by: default avatarMatthew Wilcox <matthew@wil.cx>
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent ac205b7b

drivers/pci/pci.h

+2 −0
Original line number Diff line number Diff line
@@ -207,6 +207,8 @@ enum pci_bar_type { 
	pci_bar_mem64,		/* A 64-bit memory BAR */

};



bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,

				int crs_timeout);

extern int pci_setup_device(struct pci_dev *dev);

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

				struct resource *res, unsigned int reg);

drivers/pci/probe.c

+31 −17
Original line number Diff line number Diff line
@@ -1118,40 +1118,54 @@ struct pci_dev *alloc_pci_dev(void) 
}

EXPORT_SYMBOL(alloc_pci_dev);



/*

 * Read the config data for a PCI device, sanity-check it

 * and fill in the dev structure...

 */

static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)

bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,

				 int crs_timeout)

{

	struct pci_dev *dev;

	u32 l;

	int delay = 1;



	if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))

		return NULL;

	if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))

		return false;



	/* some broken boards return 0 or ~0 if a slot is empty: */

	if (l == 0xffffffff || l == 0x00000000 ||

	    l == 0x0000ffff || l == 0xffff0000)

		return NULL;

	if (*l == 0xffffffff || *l == 0x00000000 ||

	    *l == 0x0000ffff || *l == 0xffff0000)

		return false;



	/* Configuration request Retry Status */

	while (l == 0xffff0001) {

	while (*l == 0xffff0001) {

		if (!crs_timeout)

			return false;



		msleep(delay);

		delay *= 2;

		if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &l))

			return NULL;

		if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))

			return false;

		/* Card hasn't responded in 60 seconds?  Must be stuck. */

		if (delay > 60 * 1000) {

		if (delay > crs_timeout) {

			printk(KERN_WARNING "pci %04x:%02x:%02x.%d: not "

					"responding\n", pci_domain_nr(bus),

					bus->number, PCI_SLOT(devfn),

					PCI_FUNC(devfn));

			return NULL;

			return false;

		}

	}



	return true;

}

EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);



/*

 * Read the config data for a PCI device, sanity-check it

 * and fill in the dev structure...

 */

static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)

{

	struct pci_dev *dev;

	u32 l;



	if (!pci_bus_read_dev_vendor_id(bus, devfn, &l, 60*1000))

		return NULL;



	dev = alloc_pci_dev();

	if (!dev)

		return NULL;

CRA Git | Maintained and supported by SUSTech CRA and CCSE