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irqchip/armada-370-xp: Allow allocation of multiple MSIs
Add support for allocating multiple MSIs at the same time, so that the MSI_FLAG_MULTI_PCI_MSI flag can be added to the msi_domain_info structure. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Link: https://lkml.kernel.org/r/1455115621-22846-6-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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@ -123,7 +123,8 @@ static struct irq_chip armada_370_xp_msi_irq_chip = {
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};
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static struct msi_domain_info armada_370_xp_msi_domain_info = {
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
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.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
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MSI_FLAG_MULTI_PCI_MSI),
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.chip = &armada_370_xp_msi_irq_chip,
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};
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@ -149,21 +150,26 @@ static struct irq_chip armada_370_xp_msi_bottom_irq_chip = {
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static int armada_370_xp_msi_alloc(struct irq_domain *domain, unsigned int virq,
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unsigned int nr_irqs, void *args)
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{
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int hwirq;
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int hwirq, i;
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mutex_lock(&msi_used_lock);
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hwirq = find_first_zero_bit(&msi_used, PCI_MSI_DOORBELL_NR);
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hwirq = bitmap_find_next_zero_area(msi_used, PCI_MSI_DOORBELL_NR,
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0, nr_irqs, 0);
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if (hwirq >= PCI_MSI_DOORBELL_NR) {
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mutex_unlock(&msi_used_lock);
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return -ENOSPC;
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}
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set_bit(hwirq, msi_used);
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bitmap_set(msi_used, hwirq, nr_irqs);
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mutex_unlock(&msi_used_lock);
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irq_domain_set_info(domain, virq, hwirq, &armada_370_xp_msi_bottom_irq_chip,
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domain->host_data, handle_simple_irq,
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NULL, NULL);
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for (i = 0; i < nr_irqs; i++) {
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irq_domain_set_info(domain, virq + i, hwirq + i,
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&armada_370_xp_msi_bottom_irq_chip,
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domain->host_data, handle_simple_irq,
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NULL, NULL);
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}
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return hwirq;
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}
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@ -174,10 +180,7 @@ static void armada_370_xp_msi_free(struct irq_domain *domain,
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struct irq_data *d = irq_domain_get_irq_data(domain, virq);
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mutex_lock(&msi_used_lock);
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if (!test_bit(d->hwirq, msi_used))
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pr_err("trying to free unused MSI#%lu\n", d->hwirq);
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else
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clear_bit(d->hwirq, msi_used);
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bitmap_clear(msi_used, d->hwirq, nr_irqs);
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mutex_unlock(&msi_used_lock);
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}
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