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

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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)

Fixes: 8ed536b1e2 ("coresight: catu: Add support for scatter gather tables")
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250109215348.5483-1-ilkka@os.amperecomputing.com
This commit is contained in:
Ilkka Koskinen 2025-01-09 21:53:48 +00:00 committed by Suzuki K Poulose
parent 0ad2507d5d
commit 0e14e062f5
1 changed files with 1 additions and 1 deletions
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2
drivers/hwtracing/coresight/coresight-catu.c
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@ -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))