diff options
| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2024-04-12 17:27:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-12 12:03:38 +0300 |
| commit | 3a8a24cbdd12158252fcf051661c7658fed58ced (patch) | |
| tree | 15b3fdf8a3c14b19a142cad58af52ea682c0e016 /drivers/hwtracing | |
| parent | cf9a077ab50638dd9273c1fdfe9e3e8e41678898 (diff) | |
| download | linux-3a8a24cbdd12158252fcf051661c7658fed58ced.tar.xz | |
coresight: etm4x: Safe access for TRCQCLTR
[ Upstream commit 46bf8d7cd8530eca607379033b9bc4ac5590a0cd ]
ETM4x implements TRCQCLTR only when the Q elements are supported
and the Q element filtering is supported (TRCIDR0.QFILT). Access
to the register otherwise could be fatal. Fix this by tracking the
availability, like the others.
Fixes: f188b5e76aae ("coresight: etm4x: Save/restore state across CPU low power states")
Reported-by: Yabin Cui <yabinc@google.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Yabin Cui <yabinc@google.com>
Link: https://lore.kernel.org/r/20240412142702.2882478-4-suzuki.poulose@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-core.c | 8 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 3 |
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index a84f6f63e8d6..e2e5b1422cdb 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -1120,6 +1120,8 @@ static void etm4_init_arch_data(void *info) drvdata->nr_event = FIELD_GET(TRCIDR0_NUMEVENT_MASK, etmidr0); /* QSUPP, bits[16:15] Q element support field */ drvdata->q_support = FIELD_GET(TRCIDR0_QSUPP_MASK, etmidr0); + if (drvdata->q_support) + drvdata->q_filt = !!(etmidr0 & TRCIDR0_QFILT); /* TSSIZE, bits[28:24] Global timestamp size field */ drvdata->ts_size = FIELD_GET(TRCIDR0_TSSIZE_MASK, etmidr0); @@ -1615,7 +1617,8 @@ static int __etm4_cpu_save(struct etmv4_drvdata *drvdata) state->trcccctlr = etm4x_read32(csa, TRCCCCTLR); state->trcbbctlr = etm4x_read32(csa, TRCBBCTLR); state->trctraceidr = etm4x_read32(csa, TRCTRACEIDR); - state->trcqctlr = etm4x_read32(csa, TRCQCTLR); + if (drvdata->q_filt) + state->trcqctlr = etm4x_read32(csa, TRCQCTLR); state->trcvictlr = etm4x_read32(csa, TRCVICTLR); state->trcviiectlr = etm4x_read32(csa, TRCVIIECTLR); @@ -1745,7 +1748,8 @@ static void __etm4_cpu_restore(struct etmv4_drvdata *drvdata) etm4x_relaxed_write32(csa, state->trcccctlr, TRCCCCTLR); etm4x_relaxed_write32(csa, state->trcbbctlr, TRCBBCTLR); etm4x_relaxed_write32(csa, state->trctraceidr, TRCTRACEIDR); - etm4x_relaxed_write32(csa, state->trcqctlr, TRCQCTLR); + if (drvdata->q_filt) + etm4x_relaxed_write32(csa, state->trcqctlr, TRCQCTLR); etm4x_relaxed_write32(csa, state->trcvictlr, TRCVICTLR); etm4x_relaxed_write32(csa, state->trcviiectlr, TRCVIIECTLR); diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index ff2a643fb54d..31754173091b 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -135,6 +135,7 @@ #define TRCIDR0_TRCCCI BIT(7) #define TRCIDR0_RETSTACK BIT(9) #define TRCIDR0_NUMEVENT_MASK GENMASK(11, 10) +#define TRCIDR0_QFILT BIT(14) #define TRCIDR0_QSUPP_MASK GENMASK(16, 15) #define TRCIDR0_TSSIZE_MASK GENMASK(28, 24) @@ -951,6 +952,7 @@ struct etmv4_save_state { * @os_unlock: True if access to management registers is allowed. * @instrp0: Tracing of load and store instructions * as P0 elements is supported. + * @q_filt: Q element filtering support, if Q elements are supported. * @trcbb: Indicates if the trace unit supports branch broadcast tracing. * @trccond: If the trace unit supports conditional * instruction tracing. @@ -1013,6 +1015,7 @@ struct etmv4_drvdata { bool boot_enable; bool os_unlock; bool instrp0; + bool q_filt; bool trcbb; bool trccond; bool retstack; |