[PATCH v3 11/59] irqchip/gic-v3-its: Rework LPI freeing

Marc Zyngier
2017-07-31T17:25:55Z

Rework LPI deallocation so that it can be reused by the v4 support
code.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
drivers/irqchip/irq-gic-v3-its.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index ebdb1603b95d..1298a9bca56a 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -875,16 +875,15 @@ static unsigned long *its_lpi_alloc_chunks(int nr_irqs, int *base, int *nr_ids)
return bitmap;
}

-static void its_lpi_free(struct event_lpi_map *map)
+static void its_lpi_free_chunks(unsigned long *bitmap, int base, int nr_ids)
{
- int base = map->lpi_base;
- int nr_ids = map->nr_lpis;
int lpi;

spin_lock(&lpi_lock);

for (lpi = base; lpi < (base + nr_ids); lpi += IRQS_PER_CHUNK) {
int chunk = its_lpi_to_chunk(lpi);
+
BUG_ON(chunk > lpi_chunks);
if (test_bit(chunk, lpi_bitmap)) {
clear_bit(chunk, lpi_bitmap);
@@ -895,8 +894,7 @@ static void its_lpi_free(struct event_lpi_map *map)

spin_unlock(&lpi_lock);

- kfree(map->lpi_map);
- kfree(map->col_map);
+ kfree(bitmap);
}

static struct page *its_allocate_prop_table(gfp_t gfp_flags)
@@ -1668,7 +1666,10 @@ static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
/* If all interrupts have been freed, start mopping the floor */
if (bitmap_empty(its_dev->event_map.lpi_map,
its_dev->event_map.nr_lpis)) {
- its_lpi_free(&its_dev->event_map);
+ its_lpi_free_chunks(its_dev->event_map.lpi_map,
+ its_dev->event_map.lpi_base,
+ its_dev->event_map.nr_lpis);
+ kfree(its_dev->event_map.col_map);

/* Unmap device/itt */
its_send_mapd(its_dev, 0);
--
2.11.0