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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2021-02-01 21:13:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-04 19:00:33 +0300 |
| commit | 91b9f018548747dfa6d543d74dfe59a8c6e9be7e (patch) | |
| tree | 82ca03404588e5fe7255817a4bf130e3f882e5da /drivers/hwtracing/coresight/coresight-etm4x.h | |
| parent | 03336d0f4d0d74e7a5f899bf9d4933e0d4397c94 (diff) | |
| download | linux-91b9f018548747dfa6d543d74dfe59a8c6e9be7e.tar.xz | |
coresight: etm4x: Hide sysfs attributes for unavailable registers
Some of the management registers in ETMv4.x are not accessible
via system register instructions. Thus we must hide the sysfs
files exposing them to the userspace, to prevent system crashes.
This patch adds an is_visible() routine to control the visibility
at runtime for the registers that may not be accessed.
Link: https://lore.kernel.org/r/20210110224850.1880240-13-suzuki.poulose@arm.com
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-15-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm4x.h')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index 24ba0da5b096..193d2819afa7 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -157,6 +157,9 @@ #define CASE_WRITE(val, x) \ case (x): { write_etm4x_sysreg_const_offset((val), (x)); break; } +#define CASE_NOP(__unused, x) \ + case (x): /* fall through */ + /* List of registers accessible via System instructions */ #define ETM_SYSREG_LIST(op, val) \ CASE_##op((val), TRCPRGCTLR) \ @@ -369,6 +372,9 @@ #define ETM4x_READ_SYSREG_CASES(res) ETM_SYSREG_LIST(READ, (res)) #define ETM4x_WRITE_SYSREG_CASES(val) ETM_SYSREG_LIST(WRITE, (val)) +#define ETM4x_SYSREG_LIST_CASES ETM_SYSREG_LIST(NOP, __unused) +#define ETM4x_MMAP_LIST_CASES ETM_MMAP_LIST(NOP, __unused) + #define read_etm4x_sysreg_offset(offset, _64bit) \ ({ \ u64 __val; \ |