On Tue, 23 Apr 2024 16:40:20 +0530 Nipun Gupta <nipun.gupta@xxxxxxx> wrote: > SI functions for allocation and free can be directly used by We lost the ^M in this version. > the device drivers without any wrapper provided by bus drivers. > So export these MSI functions. > > Also, add a wrapper API to allocate MSIs providing only the > number of interrupts rather than range for simpler driver usage. > > Signed-off-by: Nipun Gupta <nipun.gupta@xxxxxxx> > Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > --- > > No change in v5->v6 > > Changes in v4->v5: > - updated commit description as per the comments. I see in https://lore.kernel.org/all/87edbyfj0d.ffs@tglx/ that Thomas also suggested a new subject: genirq/msi: Add MSI allocation helper and export MSI functions I'll address both of these on commit if there are no objections or further comments. Patch 2/ looks ok to me now as well. Thanks, Alex > - Rebased on 6.9-rc1 > > Changes in v3->v4: > - No change > > Changes in v3: > - New in this patch series. VFIO-CDX uses the new wrapper API > msi_domain_alloc_irqs and exported APIs. (This patch is moved > from CDX interrupt support to vfio-cdx patch, where these APIs > are used). > > include/linux/msi.h | 6 ++++++ > kernel/irq/msi.c | 2 ++ > 2 files changed, 8 insertions(+) > > diff --git a/include/linux/msi.h b/include/linux/msi.h > index 84859a9aa091..dc27cf3903d5 100644 > --- a/include/linux/msi.h > +++ b/include/linux/msi.h > @@ -674,6 +674,12 @@ int platform_device_msi_init_and_alloc_irqs(struct device *dev, unsigned int nve > void platform_device_msi_free_irqs_all(struct device *dev); > > bool msi_device_has_isolated_msi(struct device *dev); > + > +static inline int msi_domain_alloc_irqs(struct device *dev, unsigned int domid, int nirqs) > +{ > + return msi_domain_alloc_irqs_range(dev, domid, 0, nirqs - 1); > +} > + > #else /* CONFIG_GENERIC_MSI_IRQ */ > static inline bool msi_device_has_isolated_msi(struct device *dev) > { > diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c > index f90952ebc494..2024f89baea4 100644 > --- a/kernel/irq/msi.c > +++ b/kernel/irq/msi.c > @@ -1434,6 +1434,7 @@ int msi_domain_alloc_irqs_range(struct device *dev, unsigned int domid, > msi_unlock_descs(dev); > return ret; > } > +EXPORT_SYMBOL_GPL(msi_domain_alloc_irqs_range); > > /** > * msi_domain_alloc_irqs_all_locked - Allocate all interrupts from a MSI interrupt domain > @@ -1680,6 +1681,7 @@ void msi_domain_free_irqs_range(struct device *dev, unsigned int domid, > msi_domain_free_irqs_range_locked(dev, domid, first, last); > msi_unlock_descs(dev); > } > +EXPORT_SYMBOL_GPL(msi_domain_free_irqs_all); > > /** > * msi_domain_free_irqs_all_locked - Free all interrupts from a MSI interrupt domain
