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PCI/MSI: Move pci_enable_msi() API 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_enable_msi() 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/20221111122014.755178149@linutronix.de
This commit is contained in:
Ahmed S. Darwish 2022-11-11 14:54:46 +01:00 committed by Thomas Gleixner
parent b12d0bec38
commit bbda340798
3 changed files with 26 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/pci/msi/api.c
View File

@ -12,6 +12,29 @@
#include "msi.h"
/**
* pci_enable_msi() - Enable MSI interrupt mode on device
* @dev: the PCI device to operate on
*
* Legacy device driver API to enable MSI interrupts mode on device and
* allocate a single interrupt vector. On success, the allocated vector
* Linux IRQ will be saved at @dev->irq. The driver must invoke
* pci_disable_msi() on cleanup.
*
* NOTE: The newer pci_alloc_irq_vectors() / pci_free_irq_vectors() API
* pair should, in general, be used instead.
*
* Return: 0 on success, errno otherwise
*/
int pci_enable_msi(struct pci_dev *dev)
{
int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
if (rc < 0)
return rc;
return 0;
}
EXPORT_SYMBOL(pci_enable_msi);
/**
* pci_disable_msi() - Disable MSI interrupt mode on device
* @dev: the PCI device to operate on

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

@ -790,8 +790,8 @@ void pci_disable_msix(struct pci_dev *dev)
}
EXPORT_SYMBOL(pci_disable_msix);
static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
struct irq_affinity *affd)
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
struct irq_affinity *affd)
{
int nvec;
int rc;
@ -844,16 +844,6 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
}
}
/* deprecated, don't use */
int pci_enable_msi(struct pci_dev *dev)
{
int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
if (rc < 0)
return rc;
return 0;
}
EXPORT_SYMBOL(pci_enable_msi);
static int __pci_enable_msix_range(struct pci_dev *dev,
struct msix_entry *entries, int minvec,
int maxvec, struct irq_affinity *affd,

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

@ -87,6 +87,7 @@ 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_free_msi_irqs(struct pci_dev *dev);
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);
/* Legacy (!IRQDOMAIN) fallbacks */
#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS