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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: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20221111122015.099461602@linutronix.de
This commit is contained in:
Ahmed S. Darwish 2022-11-11 14:54:56 +01:00 committed by Thomas Gleixner
parent 059f778d66
commit 7b50f62776
2 changed files with 20 additions and 20 deletions
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20
drivers/pci/msi/api.c
View File

@ -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

20
drivers/pci/msi/msi.c
View File

@ -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)
{