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| author | Reinette Chatre <reinette.chatre@intel.com> | 2023-05-11 18:44:32 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2023-05-24 00:49:03 +0300 |
| commit | b156e48fffa9f1caea490e4812a1451adb5c0ef4 (patch) | |
| tree | 6bbbe38013f13548ae8998f9cccc5a96fef3550d /include/linux/vfio_pci_core.h | |
| parent | 8850336588fbcccdca484b91631819eabaafd915 (diff) | |
| download | linux-b156e48fffa9f1caea490e4812a1451adb5c0ef4.tar.xz | |
vfio/pci: Use xarray for interrupt context storage
Interrupt context is statically allocated at the time interrupts
are allocated. Following allocation, the context is managed by
directly accessing the elements of the array using the vector
as index. The storage is released when interrupts are disabled.
It is possible to dynamically allocate a single MSI-X interrupt
after MSI-X is enabled. A dynamic storage for interrupt context
is needed to support this. Replace the interrupt context array with an
xarray (similar to what the core uses as store for MSI descriptors)
that can support the dynamic expansion while maintaining the
custom that uses the vector as index.
With a dynamic storage it is no longer required to pre-allocate
interrupt contexts at the time the interrupts are allocated.
MSI and MSI-X interrupt contexts are only used when interrupts are
enabled. Their allocation can thus be delayed until interrupt enabling.
Only enabled interrupts will have associated interrupt contexts.
Whether an interrupt has been allocated (a Linux irq number exists
for it) becomes the criteria for whether an interrupt can be enabled.
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/lkml/20230404122444.59e36a99.alex.williamson@redhat.com/
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/40e235f38d427aff79ae35eda0ced42502aa0937.1683740667.git.reinette.chatre@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'include/linux/vfio_pci_core.h')
| -rw-r--r-- | include/linux/vfio_pci_core.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/vfio_pci_core.h b/include/linux/vfio_pci_core.h index 367fd79226a3..61d7873a3973 100644 --- a/include/linux/vfio_pci_core.h +++ b/include/linux/vfio_pci_core.h @@ -59,7 +59,7 @@ struct vfio_pci_core_device { struct perm_bits *msi_perm; spinlock_t irqlock; struct mutex igate; - struct vfio_pci_irq_ctx *ctx; + struct xarray ctx; int num_ctx; int irq_type; int num_regions; |