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authorMarc Zyngier <marc.zyngier@arm.com>2017-08-04 20:37:09 +0300
committerMarc Zyngier <marc.zyngier@arm.com>2017-08-31 17:31:38 +0300
commit93f94ea0548c2628efe7d57e0989f06a14cedb53 (patch)
treeea3f9ab3829fc3aa9a679e43a5a861aae5de334b /drivers/irqchip/irq-gic-v3-its.c
parentf6a91da7c788ac7345305ee291d0b205d2f5a70f (diff)
downloadlinux-93f94ea0548c2628efe7d57e0989f06a14cedb53.tar.xz
irqchip/gic-v3-its: Make LPI allocation optional on device creation
The normal course of action when allocating the ITS' view of a device is to allocate the corresponding LPIs. But we're about to introduce devices that borrow their interrupts from some other entities. So let's make the allocation optional. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/irq-gic-v3-its.c')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 9040fb41d446..017a6efa3747 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1978,10 +1978,10 @@ static bool its_alloc_vpe_table(u32 vpe_id)
}
static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
- int nvecs)
+ int nvecs, bool alloc_lpis)
{
struct its_device *dev;
- unsigned long *lpi_map;
+ unsigned long *lpi_map = NULL;
unsigned long flags;
u16 *col_map = NULL;
void *itt;
@@ -2003,11 +2003,18 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
sz = nr_ites * its->ite_size;
sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
itt = kzalloc(sz, GFP_KERNEL);
- lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis);
- if (lpi_map)
- col_map = kzalloc(sizeof(*col_map) * nr_lpis, GFP_KERNEL);
+ if (alloc_lpis) {
+ lpi_map = its_lpi_alloc_chunks(nvecs, &lpi_base, &nr_lpis);
+ if (lpi_map)
+ col_map = kzalloc(sizeof(*col_map) * nr_lpis,
+ GFP_KERNEL);
+ } else {
+ col_map = kzalloc(sizeof(*col_map) * nr_ites, GFP_KERNEL);
+ nr_lpis = 0;
+ lpi_base = 0;
+ }
- if (!dev || !itt || !lpi_map || !col_map) {
+ if (!dev || !itt || !col_map || (!lpi_map && alloc_lpis)) {
kfree(dev);
kfree(itt);
kfree(lpi_map);
@@ -2094,7 +2101,7 @@ static int its_msi_prepare(struct irq_domain *domain, struct device *dev,
goto out;
}
- its_dev = its_create_device(its, dev_id, nvec);
+ its_dev = its_create_device(its, dev_id, nvec, true);
if (!its_dev)
return -ENOMEM;