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X-OriginatorOrg: hpe.com X-Authority-Analysis: v=2.4 cv=UflhjqSN c=1 sm=1 tr=0 ts=69d6fbfd cx=c_pps a=UObrlqRbTUrrdMEdGJ+KZA==:117 a=UObrlqRbTUrrdMEdGJ+KZA==:17 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=8nJEP1OIZ-IA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=gQcMVamqm3wCPoSYhaRC:22 a=NCWKwCw8Xy9Og0ibBRsL:22 a=OUXY8nFuAAAA:8 a=VwQbUJbxAAAA:8 a=5-R6N93_VRwDrARBPysA:9 a=wPNLvfGTeEIA:10 a=cAcMbU7R10T-QSRYIcO_:22 X-Proofpoint-GUID: WmMJQmwqUPNm2y-w9ZRXK-UesZ9vI75F X-Proofpoint-ORIG-GUID: WmMJQmwqUPNm2y-w9ZRXK-UesZ9vI75F X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA5MDAwOCBTYWx0ZWRfXwhiHq3uup2bL lYbuUiBjaRb7XcPwAUpk2Q+lU9orDe8I72bsmTiZ5ylfiHJsILdCvRnQhDhPMW156WKPVZYVsp8 HiOQNe83msaWluojwtVZFVpdKHdPcMXPr6AXSMt7G2sUwaXoQu9idA31LIBFrLVTZ60dnpNv+lc c6SoCuNrsgIaH/YCZmVXaqNYG+TxxWsvdZiGH8bks9uq9ZmU1iE5qoWmD3lPdellgE0n8hKHi4v USa/hbXZiif0snwA8yjUggGNZScNFpuPQhkWLOnx4KuDtjRr8Qfn5x8BGV5B5ahAGoufNXrj/ao Y5EyMkWe+D/wmQZHpxjYVyT1OsdCPwaBdqJ3r8ERL2tpmB6JNhroDg0/qBphETUIQO7hLZ7pvIR 6kK95RBK2wKfaO2zL6MYUk/OT4+ZmOXvmXXzL87JzsD9KvhZQs2O0cohrvQ1Ql0p7jJFKYctXJX V12iY5+hQlHnionMsEw== X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-08_07,2026-04-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 impostorscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 bulkscore=0 suspectscore=0 clxscore=1011 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604090008 Content-Type: text/plain; charset="utf-8" From: Sanman Pradhan hisi_ptt_wait_dma_reset_done() discards the return value of readl_poll_timeout_atomic(). If the DMA engine does not complete its reset within the timeout, hisi_ptt_trace_start() proceeds to start tracing regardless. Return the poll result from hisi_ptt_wait_dma_reset_done() and propagate it from hisi_ptt_trace_start(). Deassert the reset bit before returning on timeout, preserving the existing reset cleanup sequence. Move ctrl->started to the successful path so a failed start does not leave the trace marked as active. Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for H= iSilicon PCIe Tune and Trace device") Cc: stable@vger.kernel.org Signed-off-by: Sanman Pradhan --- drivers/hwtracing/ptt/hisi_ptt.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_= ptt.c index 94c371c491357..73b93df8504c4 100644 --- a/drivers/hwtracing/ptt/hisi_ptt.c +++ b/drivers/hwtracing/ptt/hisi_ptt.c @@ -171,13 +171,13 @@ static bool hisi_ptt_wait_trace_hw_idle(struct hisi_p= tt *hisi_ptt) HISI_PTT_WAIT_TRACE_TIMEOUT_US); } =20 -static void hisi_ptt_wait_dma_reset_done(struct hisi_ptt *hisi_ptt) +static int hisi_ptt_wait_dma_reset_done(struct hisi_ptt *hisi_ptt) { u32 val; =20 - readl_poll_timeout_atomic(hisi_ptt->iobase + HISI_PTT_TRACE_WR_STS, - val, !val, HISI_PTT_RESET_POLL_INTERVAL_US, - HISI_PTT_RESET_TIMEOUT_US); + return readl_poll_timeout_atomic(hisi_ptt->iobase + HISI_PTT_TRACE_WR_STS, + val, !val, HISI_PTT_RESET_POLL_INTERVAL_US, + HISI_PTT_RESET_TIMEOUT_US); } =20 static void hisi_ptt_trace_end(struct hisi_ptt *hisi_ptt) @@ -194,6 +194,7 @@ static int hisi_ptt_trace_start(struct hisi_ptt *hisi_p= tt) { struct hisi_ptt_trace_ctrl *ctrl =3D &hisi_ptt->trace_ctrl; u32 val; + int ret; int i; =20 /* Check device idle before start trace */ @@ -202,19 +203,21 @@ static int hisi_ptt_trace_start(struct hisi_ptt *hisi= _ptt) return -EBUSY; } =20 - ctrl->started =3D true; - /* Reset the DMA before start tracing */ val =3D readl(hisi_ptt->iobase + HISI_PTT_TRACE_CTRL); val |=3D HISI_PTT_TRACE_CTRL_RST; writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL); =20 - hisi_ptt_wait_dma_reset_done(hisi_ptt); + ret =3D hisi_ptt_wait_dma_reset_done(hisi_ptt); =20 + /* De-assert reset regardless of whether the wait timed out */ val =3D readl(hisi_ptt->iobase + HISI_PTT_TRACE_CTRL); val &=3D ~HISI_PTT_TRACE_CTRL_RST; writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL); =20 + if (ret) + return 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X-OriginatorOrg: hpe.com X-Authority-Analysis: v=2.4 cv=QNxYgALL c=1 sm=1 tr=0 ts=69d6fc02 cx=c_pps a=A+SOMQ4XYIH4HgQ50p3F5Q==:117 a=A+SOMQ4XYIH4HgQ50p3F5Q==:17 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=8nJEP1OIZ-IA:10 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=gQcMVamqm3wCPoSYhaRC:22 a=3haJ9R1Aw3gUfsUHDaCR:22 a=OUXY8nFuAAAA:8 a=gzvE_2QqEpEWtzhWCywA:9 a=wPNLvfGTeEIA:10 a=cAcMbU7R10T-QSRYIcO_:22 X-Proofpoint-ORIG-GUID: yWwyrd8emiSRZ1e7H1cUks6HAanE9rLI X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA5MDAwOCBTYWx0ZWRfX6Hj2UOZbcThd U2jDGe2LmxvqqjuNefWHR1o6sLEFsZsqX5OetxBdaaFwf1/ZhRiMvH07Vs99gV16D0fVDRNvI2l bw7KbWoNIDxy/dWxvVu/9PmaIxk3MtgOe6JZ5v8w48rgHc1x5RE3gHV9dgE6xWzYOZZ0ENkcDCL bWJahzHJc8MKXxgO+nHIwG7VWgQ3/iBW6GVez4ap0loOssbl1bNILCskOfsHiIpIoA+Go4dptJF fK2N/ktOWngAwozLIAYGjghheyl5CQ/I30Bc1QyJHhvpNfSHZr0K2+EtV7L0762o0Ud/JYMYLrg iAUtJ5VtHNVxQ5QJgXmlCagKsScIyJKYnpDhtur+jHSWi2xaXXJ2uIIScxz56iUzt7vUc4jf+c/ rz3cRdzD0KncuJ5aIt3hI1UhYcCBsKeu2fy61E54cYcHlzCrJ8uGfKyaCaKEC4b4xw7YG+mhQ4W 8jlIU/qN3Oy3gju/muw== X-Proofpoint-GUID: yWwyrd8emiSRZ1e7H1cUks6HAanE9rLI X-HPE-SCL: -1 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-08_07,2026-04-08_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1011 suspectscore=0 impostorscore=0 adultscore=0 bulkscore=0 malwarescore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604090008 Content-Type: text/plain; charset="utf-8" From: Sanman Pradhan hisi_ptt_trace_start() clears all four trace buffers before enabling tracing. This is unnecessary. On trace stop, hisi_ptt_update_aux() copies only the number of bytes reported in HISI_PTT_TRACE_WR_STS. On buffer-full interrupts, it copies a full completed buffer. In both cases the driver only consumes data written by hardware. Remove the buffer clearing from the trace start path. Signed-off-by: Sanman Pradhan Reviewed-by: Yicong Yang --- drivers/hwtracing/ptt/hisi_ptt.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_= ptt.c index 73b93df8504c4..cbfbd1f146ba3 100644 --- a/drivers/hwtracing/ptt/hisi_ptt.c +++ b/drivers/hwtracing/ptt/hisi_ptt.c @@ -195,7 +195,6 @@ static int hisi_ptt_trace_start(struct hisi_ptt *hisi_p= tt) struct hisi_ptt_trace_ctrl *ctrl =3D &hisi_ptt->trace_ctrl; u32 val; int ret; - int i; =20 /* Check device idle before start trace */ if (!hisi_ptt_wait_trace_hw_idle(hisi_ptt)) { @@ -221,10 +220,6 @@ static int hisi_ptt_trace_start(struct hisi_ptt *hisi_= ptt) /* Reset the index of current buffer */ hisi_ptt->trace_ctrl.buf_index =3D 0; =20 - /* Zero the trace buffers */ - for (i =3D 0; i < HISI_PTT_TRACE_BUF_CNT; i++) - memset(ctrl->trace_buf[i].addr, 0, HISI_PTT_TRACE_BUF_SIZE); - /* Clear the interrupt status */ writel(HISI_PTT_TRACE_INT_STAT_MASK, hisi_ptt->iobase + HISI_PTT_TRACE_IN= T_STAT); writel(0, hisi_ptt->iobase + HISI_PTT_TRACE_INT_MASK); --=20 2.34.1