irqchip/gic-v3-its: Align PCI Multi-MSI allocation on their size
The way we allocate events works fine in most cases, except
when multiple PCI devices share an ITS-visible DevID, and that
one of them is trying to use MultiMSI allocation.
In that case, our allocation is not guaranteed to be zero-based
anymore, and we have to make sure we allocate it on a boundary
that is compatible with the PCI Multi-MSI constraints.
Fix this by allocating the full region upfront instead of iterating
over the number of MSIs. MSI-X are always allocated one by one,
so this shouldn't change anything on that front.
Fixes: b48ac83d6b
("irqchip: GICv3: ITS: MSI support")
Cc: stable@vger.kernel.org
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
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@ -2399,13 +2399,14 @@ static void its_free_device(struct its_device *its_dev)
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kfree(its_dev);
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}
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static int its_alloc_device_irq(struct its_device *dev, irq_hw_number_t *hwirq)
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static int its_alloc_device_irq(struct its_device *dev, int nvecs, irq_hw_number_t *hwirq)
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{
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int idx;
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idx = find_first_zero_bit(dev->event_map.lpi_map,
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dev->event_map.nr_lpis);
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if (idx == dev->event_map.nr_lpis)
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idx = bitmap_find_free_region(dev->event_map.lpi_map,
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dev->event_map.nr_lpis,
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get_count_order(nvecs));
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if (idx < 0)
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return -ENOSPC;
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*hwirq = dev->event_map.lpi_base + idx;
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@ -2501,21 +2502,21 @@ static int its_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
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int err;
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int i;
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for (i = 0; i < nr_irqs; i++) {
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err = its_alloc_device_irq(its_dev, &hwirq);
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err = its_alloc_device_irq(its_dev, nr_irqs, &hwirq);
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if (err)
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return err;
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err = its_irq_gic_domain_alloc(domain, virq + i, hwirq);
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for (i = 0; i < nr_irqs; i++) {
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err = its_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
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if (err)
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return err;
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irq_domain_set_hwirq_and_chip(domain, virq + i,
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hwirq, &its_irq_chip, its_dev);
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hwirq + i, &its_irq_chip, its_dev);
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irqd_set_single_target(irq_desc_get_irq_data(irq_to_desc(virq + i)));
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pr_debug("ID:%d pID:%d vID:%d\n",
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(int)(hwirq - its_dev->event_map.lpi_base),
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(int) hwirq, virq + i);
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(int)(hwirq + i - its_dev->event_map.lpi_base),
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(int)(hwirq + i), virq + i);
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}
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return 0;
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