[PATCH 4/4] irqchip/gic-v3-its: Use allocation size from the prepare call

Marc Zyngier
2025-05-11T16:35:27Z

Now that .msi_prepare() gets called at the right time and not
with semi-random parameters, remove the ugly hack that tried
to fix up the number of allocated vectors.

It is now correct by construction.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
drivers/irqchip/irq-gic-v3-its-msi-parent.c | 19 -------------------
1 file changed, 19 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its-msi-parent.c b/drivers/irqchip/irq-gic-v3-its-msi-parent.c
index 76b94f55b00e2..2df75a758c104 100644
--- a/drivers/irqchip/irq-gic-v3-its-msi-parent.c
+++ b/drivers/irqchip/irq-gic-v3-its-msi-parent.c
@@ -67,17 +67,6 @@ static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
/* ITS specific DeviceID, as the core ITS ignores dev. */
info->scratchpad[0].ul = pci_msi_domain_get_msi_rid(domain->parent, pdev);

- /*
- * @domain->msi_domain_info->hwsize contains the size of the
- * MSI[-X] domain, but vector allocation happens one by one. This
- * needs some thought when MSI comes into play as the size of MSI
- * might be unknown at domain creation time and therefore set to
- * MSI_MAX_INDEX.
- */
- msi_info = msi_get_domain_info(domain);
- if (msi_info->hwsize > nvec)
- nvec = msi_info->hwsize;
-
/*
* Always allocate a power of 2, and special case device 0 for
* broken systems where the DevID is not wired (and all devices
@@ -143,14 +132,6 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
/* ITS specific DeviceID, as the core ITS ignores dev. */
info->scratchpad[0].ul = dev_id;

- /*
- * @domain->msi_domain_info->hwsize contains the size of the device
- * domain, but vector allocation happens one by one.
- */
- msi_info = msi_get_domain_info(domain);
- if (msi_info->hwsize > nvec)
- nvec = msi_info->hwsize;
-
/* Allocate at least 32 MSIs, and always as a power of 2 */
nvec = max_t(int, 32, roundup_pow_of_two(nvec));

--
2.39.2