The following commit has been merged into the irq/irqchip-fixes branch of irqchip:

Commit-ID: d0a553502efd545c1ce3fd08fc4d423f8e4ac3d6 Gitweb: https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/d0a553502e... Author: Pali Rohár pali@kernel.org AuthorDate: Thu, 25 Nov 2021 14:00:57 +01:00 Committer: Marc Zyngier maz@kernel.org CommitterDate: Thu, 25 Nov 2021 16:49:50

irqchip/armada-370-xp: Fix support for Multi-MSI interrupts

irq-armada-370-xp driver already sets MSI_FLAG_MULTI_PCI_MSI flag into msi_domain_info structure. But allocated interrupt numbers for Multi-MSI needs to be properly aligned otherwise devices send MSI interrupt with wrong number.

Fix this issue by using function bitmap_find_free_region() instead of bitmap_find_next_zero_area() to allocate aligned interrupt numbers.

Signed-off-by: Pali Rohár pali@kernel.org Fixes: a71b9412c90c ("irqchip/armada-370-xp: Allow allocation of multiple MSIs") Cc: stable@vger.kernel.org Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20211125130057.26705-2-pali@kernel.org --- drivers/irqchip/irq-armada-370-xp.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c index 41ad745..5b8d571 100644 --- a/drivers/irqchip/irq-armada-370-xp.c +++ b/drivers/irqchip/irq-armada-370-xp.c @@ -232,16 +232,12 @@ static int armada_370_xp_msi_alloc(struct irq_domain *domain, unsigned int virq, int hwirq, i;

mutex_lock(&msi_used_lock); + hwirq = bitmap_find_free_region(msi_used, PCI_MSI_DOORBELL_NR, + order_base_2(nr_irqs)); + mutex_unlock(&msi_used_lock);

- hwirq = bitmap_find_next_zero_area(msi_used, PCI_MSI_DOORBELL_NR, - 0, nr_irqs, 0); - if (hwirq >= PCI_MSI_DOORBELL_NR) { - mutex_unlock(&msi_used_lock); + if (hwirq < 0) return -ENOSPC; - } - - bitmap_set(msi_used, hwirq, nr_irqs); - mutex_unlock(&msi_used_lock);

for (i = 0; i < nr_irqs; i++) { irq_domain_set_info(domain, virq + i, hwirq + i, @@ -259,7 +255,7 @@ static void armada_370_xp_msi_free(struct irq_domain *domain, struct irq_data *d = irq_domain_get_irq_data(domain, virq);

mutex_lock(&msi_used_lock); - bitmap_clear(msi_used, d->hwirq, nr_irqs); + bitmap_release_region(msi_used, d->hwirq, order_base_2(nr_irqs)); mutex_unlock(&msi_used_lock); }