diff mbox series

coresight: catu: Fix number of pages while using 64k pages

Message ID 20250109215348.5483-1-ilkka@os.amperecomputing.com (mailing list archive)
State New
Headers show
Series coresight: catu: Fix number of pages while using 64k pages | expand

Commit Message

Ilkka Koskinen Jan. 9, 2025, 9:53 p.m. UTC 
Trying to record a trace on kernel with 64k pages resulted in -ENOMEM.
This happens due to a bug in calculating the number of table pages, which
returns zero. Fix the issue by rounding up.

$ perf record --kcore -e cs_etm/@tmc_etr55,cycacc,branch_broadcast/k --per-thread taskset --cpu-list 1 dd if=/dev/zero of=/dev/null
failed to mmap with 12 (Cannot allocate memory)

Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
---
 drivers/hwtracing/coresight/coresight-catu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index 275cc0d9f505..3378bb77e6b4 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -269,7 +269,7 @@  catu_init_sg_table(struct device *catu_dev, int node,
 	 * Each table can address upto 1MB and we can have
 	 * CATU_PAGES_PER_SYSPAGE tables in a system page.
 	 */
-	nr_tpages = DIV_ROUND_UP(size, SZ_1M) / CATU_PAGES_PER_SYSPAGE;
+	nr_tpages = DIV_ROUND_UP(size, CATU_PAGES_PER_SYSPAGE * SZ_1M);
 	catu_table = tmc_alloc_sg_table(catu_dev, node, nr_tpages,
 					size >> PAGE_SHIFT, pages);
 	if (IS_ERR(catu_table))