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authorMarc Zyngier <marc.zyngier@arm.com>2018-02-06 21:55:33 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2018-02-16 16:47:58 +0300
commitde337ee301422756dff43d6c60fbb0400c1235e9 (patch)
treee9b697ef630c31e9ce5aafc336ed650678408cae /drivers
parent95a2562590c2f64a0398183f978d5cf3db6d0284 (diff)
downloadlinux-de337ee301422756dff43d6c60fbb0400c1235e9.tar.xz
irqchip/gic-v2m: Add PCI Multi-MSI support
We'd never implemented Multi-MSI support with GICv2m, because it is weird and clunky, and you'd think people would rather use MSI-X. Turns out there is still plenty of devices out there that rely on Multi-MSI. Oh well, let's teach that trick to the v2m widget, it is not a big deal anyway. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/irqchip/irq-gic-v2m.c46
1 files changed, 22 insertions, 24 deletions
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 993a8426a453..1ff38aff9f29 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -94,7 +94,7 @@ static struct irq_chip gicv2m_msi_irq_chip = {
static struct msi_domain_info gicv2m_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
- MSI_FLAG_PCI_MSIX),
+ MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
.chip = &gicv2m_msi_irq_chip,
};
@@ -155,18 +155,12 @@ static int gicv2m_irq_gic_domain_alloc(struct irq_domain *domain,
return 0;
}
-static void gicv2m_unalloc_msi(struct v2m_data *v2m, unsigned int hwirq)
+static void gicv2m_unalloc_msi(struct v2m_data *v2m, unsigned int hwirq,
+ int nr_irqs)
{
- int pos;
-
- pos = hwirq - v2m->spi_start;
- if (pos < 0 || pos >= v2m->nr_spis) {
- pr_err("Failed to teardown msi. Invalid hwirq %d\n", hwirq);
- return;
- }
-
spin_lock(&v2m_lock);
- __clear_bit(pos, v2m->bm);
+ bitmap_release_region(v2m->bm, hwirq - v2m->spi_start,
+ get_count_order(nr_irqs));
spin_unlock(&v2m_lock);
}
@@ -174,13 +168,13 @@ static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *args)
{
struct v2m_data *v2m = NULL, *tmp;
- int hwirq, offset, err = 0;
+ int hwirq, offset, i, err = 0;
spin_lock(&v2m_lock);
list_for_each_entry(tmp, &v2m_nodes, entry) {
- offset = find_first_zero_bit(tmp->bm, tmp->nr_spis);
- if (offset < tmp->nr_spis) {
- __set_bit(offset, tmp->bm);
+ offset = bitmap_find_free_region(tmp->bm, tmp->nr_spis,
+ get_count_order(nr_irqs));
+ if (offset >= 0) {
v2m = tmp;
break;
}
@@ -192,16 +186,21 @@ static int gicv2m_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
hwirq = v2m->spi_start + offset;
- err = gicv2m_irq_gic_domain_alloc(domain, virq, hwirq);
- if (err) {
- gicv2m_unalloc_msi(v2m, hwirq);
- return err;
- }
+ for (i = 0; i < nr_irqs; i++) {
+ err = gicv2m_irq_gic_domain_alloc(domain, virq + i, hwirq + i);
+ if (err)
+ goto fail;
- irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
- &gicv2m_irq_chip, v2m);
+ irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+ &gicv2m_irq_chip, v2m);
+ }
return 0;
+
+fail:
+ irq_domain_free_irqs_parent(domain, virq, nr_irqs);
+ gicv2m_unalloc_msi(v2m, hwirq, get_count_order(nr_irqs));
+ return err;
}
static void gicv2m_irq_domain_free(struct irq_domain *domain,
@@ -210,8 +209,7 @@ static void gicv2m_irq_domain_free(struct irq_domain *domain,
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
struct v2m_data *v2m = irq_data_get_irq_chip_data(d);
- BUG_ON(nr_irqs != 1);
- gicv2m_unalloc_msi(v2m, d->hwirq);
+ gicv2m_unalloc_msi(v2m, d->hwirq, nr_irqs);
irq_domain_free_irqs_parent(domain, virq, nr_irqs);
}