irqchip/gic-v3-its: Reduce minimum LPI allocation to 1 for PCI devices

Allocating a minimum of 32 LPIs per PCI device, let's reduce it to
be just 1, as most devices do not need that many interrupts.

We still have to special-case DevID 0, as there is plenty of broken
HW around where the PCI RID is not presented as a DevID to the ITS,
and all the devices are presented as DevID 0. In this case, we keep
the 32 minimal allocation.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
index 75c3cafabc6a..8d6d009d1d58 100644
--- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
@@ -66,7 +66,7 @@ static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
 {
         struct pci_dev *pdev, *alias_dev;
         struct msi_domain_info *msi_info;
-        int alias_count = 0;
+        int alias_count = 0, minnvec = 1;
 
         if (!dev_is_pci(dev))
                 return -EINVAL;
@@ -86,9 +86,17 @@ 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, pdev);
 
-        /* Allocate at least 32 MSIs, and always as a power of 2 */
+        /*
+         * Always allocate a power of 2, and special case device 0 for
+         * broken systems where the DevID is not wired (and all devices
+         * appear as DevID 0). For that reason, we generously allocate a
+         * minimum of 32 MSIs for DevID 0. If you want more because all
+         * your devices are aliasing to DevID 0, consider fixing your HW.
+         */
         nvec = max(nvec, alias_count);
-        nvec = max_t(int, 32, roundup_pow_of_two(nvec));
+        if (!info->scratchpad[0].ul)
+                minnvec = 32;
+        nvec = max_t(int, minnvec, roundup_pow_of_two(nvec));
         return msi_info->ops->msi_prepare(domain->parent, dev, nvec, info);
 }