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| author | Ilkka Koskinen <ilkka@os.amperecomputing.com> | 2025-01-09 21:53:48 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-04-10 14:33:35 +0200 |
| commit | 90b7ad7678ad60cf71f2cd1910ae414ae1e736e7 (patch) | |
| tree | 62d7f218d43e9dd70120acfcdc0d079f3e93d0da /drivers | |
| parent | b0201583c12387beec28def40680f6a0e74c0e7a (diff) | |
| download | linux-90b7ad7678ad60cf71f2cd1910ae414ae1e736e7.tar.gz linux-90b7ad7678ad60cf71f2cd1910ae414ae1e736e7.tar.bz2 linux-90b7ad7678ad60cf71f2cd1910ae414ae1e736e7.zip | |
coresight: catu: Fix number of pages while using 64k pages
[ Upstream commit 0e14e062f5ff98aa15264dfa87c5f5e924028561 ]
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: 8ed536b1e283 ("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
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-catu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c index bc90a03f478f..6ef7afa25631 100644 --- a/drivers/hwtracing/coresight/coresight-catu.c +++ b/drivers/hwtracing/coresight/coresight-catu.c @@ -267,7 +267,7 @@ 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)) |