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irqchip/gic-v3-its: Use allocation size from the prepare call

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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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250513163144.2215824-6-maz@kernel.org
This commit is contained in:
Marc Zyngier 2025-05-13 17:31:44 +01:00 committed by Thomas Gleixner
parent 03c298760e
commit 7dd20bf2f0
1 changed files with 0 additions and 19 deletions
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19
drivers/irqchip/irq-gic-v3-its-msi-parent.c
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@ -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
@ -151,14 +140,6 @@ 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));