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genirq/msi: Provide msi_domain_ops:: Prepare_desc()

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The existing MSI domain ops msi_prepare() and set_desc() turned out to be
unsuitable for implementing IMS support.

msi_prepare() does not operate on the MSI descriptors. set_desc() lacks
an irq_domain pointer and has a completely different purpose.

Introduce a prepare_desc() op which allows IMS implementations to amend an
MSI descriptor which was allocated by the core code, e.g. by adjusting the
iomem base or adding some data based on the allocated index. This is way
better than requiring that all IMS domain implementations preallocate the
MSI descriptor and then allocate the interrupt.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221124232326.444560717@linutronix.de
This commit is contained in:
Thomas Gleixner
2022-11-25 00:26:16 +01:00
parent efd4204965
commit 8f986fd775
2 changed files with 8 additions and 1 deletions
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3
kernel/irq/msi.c
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@@ -1254,6 +1254,9 @@ static int __msi_domain_alloc_irqs(struct device *dev, struct irq_domain *domain
if (WARN_ON_ONCE(allocated >= ctrl->nirqs))
return -EINVAL;
if (ops->prepare_desc)
ops->prepare_desc(domain, &arg, desc);
ops->set_desc(&arg, desc);
virq = __irq_domain_alloc_irqs(domain, -1, desc->nvec_used,