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Commit fc0f9f4d authored by Heiner Kallweit's avatar Heiner Kallweit Committed by David S. Miller
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PCI: Add pcim_set_mwi(), a device-managed pci_set_mwi() 



Add pcim_set_mwi(), a device-managed version of pci_set_mwi().
First user is the Realtek r8169 driver.

Signed-off-by: default avatarHeiner Kallweit <hkallweit1@gmail.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ec94c269

drivers/pci/pci.c

+25 −0
Original line number Diff line number Diff line
@@ -1458,6 +1458,7 @@ struct pci_devres { 
	unsigned int pinned:1;

	unsigned int orig_intx:1;

	unsigned int restore_intx:1;

	unsigned int mwi:1;

	u32 region_mask;

};
@@ -1476,6 +1477,9 @@ static void pcim_release(struct device *gendev, void *res) 
		if (this->region_mask & (1 << i))

			pci_release_region(dev, i);



	if (this->mwi)

		pci_clear_mwi(dev);



	if (this->restore_intx)

		pci_intx(dev, this->orig_intx);
@@ -3760,6 +3764,27 @@ int pci_set_mwi(struct pci_dev *dev) 
}

EXPORT_SYMBOL(pci_set_mwi);



/**

 * pcim_set_mwi - a device-managed pci_set_mwi()

 * @dev: the PCI device for which MWI is enabled

 *

 * Managed pci_set_mwi().

 *

 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.

 */

int pcim_set_mwi(struct pci_dev *dev)

{

	struct pci_devres *dr;



	dr = find_pci_dr(dev);

	if (!dr)

		return -ENOMEM;



	dr->mwi = 1;

	return pci_set_mwi(dev);

}

EXPORT_SYMBOL(pcim_set_mwi);



/**

 * pci_try_set_mwi - enables memory-write-invalidate PCI transaction

 * @dev: the PCI device for which MWI is enabled

include/linux/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -1072,6 +1072,7 @@ int pci_set_pcie_reset_state(struct pci_dev *dev, enum pcie_reset_state state); 
int pci_set_cacheline_size(struct pci_dev *dev);

#define HAVE_PCI_SET_MWI

int __must_check pci_set_mwi(struct pci_dev *dev);

int __must_check pcim_set_mwi(struct pci_dev *dev);

int pci_try_set_mwi(struct pci_dev *dev);

void pci_clear_mwi(struct pci_dev *dev);

void pci_intx(struct pci_dev *dev, int enable);