diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-08-04 18:37:09 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2017-08-31 15:31:38 +0100 |
| commit | 93f94ea0548c2628efe7d57e0989f06a14cedb53 (patch) | |
| tree | ea3f9ab3829fc3aa9a679e43a5a861aae5de334b /drivers/irqchip | |
| parent | f6a91da7c788ac7345305ee291d0b205d2f5a70f (diff) | |
| download | linux-93f94ea0548c2628efe7d57e0989f06a14cedb53.tar.gz | |
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')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 21 |
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; |