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PCI/MSI: Move pci_disable_msix() 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_disable_msix() 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/20221111122015.156785224@linutronix.de
This commit is contained in:
Ahmed S. Darwish 2022-11-11 14:54:58 +01:00 committed by Thomas Gleixner
parent 7b50f62776
commit 18e1926b8c
3 changed files with 26 additions and 13 deletions
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24
drivers/pci/msi/api.c
View File

@ -111,6 +111,30 @@ int pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries,
}
EXPORT_SYMBOL(pci_enable_msix_range);
/**
* pci_disable_msix() - Disable MSI-X interrupt mode on device
* @dev: the PCI device to operate on
*
* Legacy device driver API to disable MSI-X interrupt mode on device,
* free earlier-allocated interrupt vectors, and restore INTx.
* The PCI device Linux IRQ (@dev->irq) is restored to its default pin
* assertion IRQ. This is the cleanup pair of pci_enable_msix_range().
*
* NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API
* pair should, in general, be used instead.
*/
void pci_disable_msix(struct pci_dev *dev)
{
if (!pci_msi_enabled() || !dev || !dev->msix_enabled)
return;
msi_lock_descs(&dev->dev);
pci_msix_shutdown(dev);
pci_free_msi_irqs(dev);
msi_unlock_descs(&dev->dev);
}
EXPORT_SYMBOL(pci_disable_msix);
/**
* pci_alloc_irq_vectors() - Allocate multiple device interrupt vectors
* @dev: the PCI device to operate on

14
drivers/pci/msi/msi.c
View File

@ -736,7 +736,7 @@ static int __pci_enable_msix(struct pci_dev *dev, struct msix_entry *entries,
return msix_capability_init(dev, entries, nvec, affd);
}
static void pci_msix_shutdown(struct pci_dev *dev)
void pci_msix_shutdown(struct pci_dev *dev)
{
struct msi_desc *desc;
@ -758,18 +758,6 @@ static void pci_msix_shutdown(struct pci_dev *dev)
pcibios_alloc_irq(dev);
}
void pci_disable_msix(struct pci_dev *dev)
{
if (!pci_msi_enable || !dev || !dev->msix_enabled)
return;
msi_lock_descs(&dev->dev);
pci_msix_shutdown(dev);
pci_free_msi_irqs(dev);
msi_unlock_descs(&dev->dev);
}
EXPORT_SYMBOL(pci_disable_msix);
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
struct irq_affinity *affd)
{

1
drivers/pci/msi/msi.h
View File

@ -86,6 +86,7 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
/* MSI internal functions invoked from the public APIs */
void pci_msi_shutdown(struct pci_dev *dev);
void pci_msix_shutdown(struct pci_dev *dev);
void pci_free_msi_irqs(struct pci_dev *dev);
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
int __pci_enable_msix_range(struct pci_dev *dev, struct msix_entry *entries, int minvec,