We are always allocating extra 255Bytes of memory to handle ITTE
physical address alignment requirement. The kmalloc() satisfies
the ITTE alignment since the ITS driver is requesting a minimum
size of ITS_ITT_ALIGN bytes.
Let's try to allocate the exact amount of memory that is required
for ITTEs to avoid wastage.
Signed-off-by: Shanker Donthineni <shank...@codeaurora.org>
---
drivers/irqchip/irq-gic-v3-its.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 86bd428..5aeca78 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1329,8 +1329,13 @@ static struct its_device *its_create_device(struct
its_node *its, u32 dev_id,
*/
nr_ites = max(2UL, roundup_pow_of_two(nvecs));
sz = nr_ites * its->ite_size;
- sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
+ sz = max(sz, ITS_ITT_ALIGN);
itt = kzalloc(sz, GFP_KERNEL);
+ if (itt && !IS_ALIGNED(virt_to_phys(itt), ITS_ITT_ALIGN)) {
+ kfree(itt);
+ itt = kzalloc(sz + ITS_ITT_ALIGN - 1, 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);
--
Qualcomm Datacenter Technologies, Inc. on behalf of the Qualcomm Technologies,
Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux
Foundation Collaborative Project.
