diff options
| author | Yuanfang Zhang <quic_yuanfang@quicinc.com> | 2025-01-16 17:04:20 +0800 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2025-02-26 11:25:05 +0000 |
| commit | 4ff6039ffb79a4a8a44b63810a8a2f2b43264856 (patch) | |
| tree | 51cda016c6ecc92261e671f3faafe4a148cb007c /include/linux/coresight.h | |
| parent | cade8a89b101dbcd0a169fd464a8dff079d11a2b (diff) | |
coresight-etm4x: add isb() before reading the TRCSTATR
As recommended by section 4.3.7 ("Synchronization when using system
instructions to progrom the trace unit") of ARM IHI 0064H.b, the
self-hosted trace analyzer must perform a Context synchronization
event between writing to the TRCPRGCTLR and reading the TRCSTATR.
Additionally, add an ISB between the each read of TRCSTATR on
coresight_timeout() when using system instructions to program the
trace unit.
Fixes: 1ab3bb9df5e3 ("coresight: etm4x: Add necessary synchronization for sysreg access")
Signed-off-by: Yuanfang Zhang <quic_yuanfang@quicinc.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20250116-etm_sync-v4-1-39f2b05e9514@quicinc.com
Diffstat (limited to 'include/linux/coresight.h')
| -rw-r--r-- | include/linux/coresight.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 3eef4e91df3f..c7614ccb3232 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -661,6 +661,10 @@ extern int coresight_enable_sysfs(struct coresight_device *csdev); extern void coresight_disable_sysfs(struct coresight_device *csdev); extern int coresight_timeout(struct csdev_access *csa, u32 offset, int position, int value); +typedef void (*coresight_timeout_cb_t) (struct csdev_access *, u32, int, int); +extern int coresight_timeout_action(struct csdev_access *csa, u32 offset, + int position, int value, + coresight_timeout_cb_t cb); extern int coresight_claim_device(struct coresight_device *csdev); extern int coresight_claim_device_unlocked(struct coresight_device *csdev); |