Commit 7b50f627 authored by Ahmed S. Darwish's avatar Ahmed S. Darwish Committed by Thomas Gleixner
Browse files

PCI/MSI: Move pci_msix_vec_count() to api.c 



To disentangle the maze in msi.c, all exported device-driver MSI APIs are
now to be grouped in one file, api.c.

Move pci_msix_vec_count() and make its kernel-doc comprehensive.

Signed-off-by: default avatarAhmed S. Darwish <darwi@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20221111122015.099461602@linutronix.de
parent 059f778d

drivers/pci/msi/api.c

+20 −0
Original line number Diff line number Diff line
@@ -59,6 +59,26 @@ void pci_disable_msi(struct pci_dev *dev) 
}

EXPORT_SYMBOL(pci_disable_msi);



/**

 * pci_msix_vec_count() - Get number of MSI-X interrupt vectors on device

 * @dev: the PCI device to operate on

 *

 * Return: number of MSI-X interrupt vectors available on this device

 * (i.e., the device's MSI-X capability structure "table size"), -EINVAL

 * if the device is not MSI-X capable, other errnos otherwise.

 */

int pci_msix_vec_count(struct pci_dev *dev)

{

	u16 control;



	if (!dev->msix_cap)

		return -EINVAL;



	pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);

	return msix_table_size(control);

}

EXPORT_SYMBOL(pci_msix_vec_count);



/**

 * pci_enable_msix_range() - Enable MSI-X interrupt mode on device

 * @dev:     the PCI device to operate on

drivers/pci/msi/msi.c

+0 −20
Original line number Diff line number Diff line
@@ -701,26 +701,6 @@ void pci_msi_shutdown(struct pci_dev *dev) 
	pcibios_alloc_irq(dev);

}



/**

 * pci_msix_vec_count - return the number of device's MSI-X table entries

 * @dev: pointer to the pci_dev data structure of MSI-X device function

 * This function returns the number of device's MSI-X table entries and

 * therefore the number of MSI-X vectors device is capable of sending.

 * It returns a negative errno if the device is not capable of sending MSI-X

 * interrupts.

 **/

int pci_msix_vec_count(struct pci_dev *dev)

{

	u16 control;



	if (!dev->msix_cap)

		return -EINVAL;



	pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &control);

	return msix_table_size(control);

}

EXPORT_SYMBOL(pci_msix_vec_count);



static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,

			     int nvec, struct irq_affinity *affd, int flags)

{