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Tue, 25 Aug 2026 07:29:36 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 25 Aug 2026 07:29:36 +0000 (GMT) From: Thomas Richter To: linux-s390@vger.kernel.org Cc: Thomas Richter Subject: [PATCH 0/3 v6] Add CPU hotplug support for PAI PMU Date: Tue, 25 Aug 2026 09:29:28 +0200 Message-ID: <20260825072931.3738180-1-tmricht@linux.ibm.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=TfimcxQh c=1 sm=1 tr=0 ts=6a8d4465 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=lQW9TJnzQ4aT2Au-fZ0A:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI1MDA1OCBTYWx0ZWRfX9PE0qiRixWPM ZlK5rec1mk4EyFBa5zYLn9pbXOpnYbj6DkTXVi4dYVIXfSCnd+prSvnEd/50T3j+mb377d4gTGd NpNtLuDso195H8pUxWXGsF97gVYtgz0= X-Proofpoint-GUID: nS779Y-Un9VjBP3SB1BOo9TFSjb-97rV X-Proofpoint-ORIG-GUID: nS779Y-Un9VjBP3SB1BOo9TFSjb-97rV X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI1MDA1OCBTYWx0ZWRfX4/amIhZR+Sbe dpYDw0dIpdzqo77OIpC3BzBig0HdUCH3e69RUZn4wfLqFdxZRmd/I1CmBuMrw24oC3Jakx9JsiJ yNqYY7OwOR+6aiMWSwgY90Dtiok14GW5t9nwt6qWfva1pZDGstJaGvcilDAR4B4Y3sTIQiFQWT1 SjmtM2klAAh05oYjFUJO3pUvBoWVsbdtHt5Nhbp0km/MUwwJfEPm1ZbJV+b0TuBJBX/j8GUW55E EZOFEnz2z+k+88NcxNhNsK06zHEMJTXyOxpHa3UQGeuGYpbpAf4S/dwh+m/k4nVBBy3WJAkJTYf 3BshIyxr6+nJXkkcdjWhku+bmo3NMgJ1WeDbXzisvpFXN2u+8NxJPefU2iQ4szKEbqGaZfw+RQ6 2CIiEu2Hky3WD8nVGVbPDzjaeeWKRu8qPWO4vecSROs6ZGMjsCMN7evdSUTxpkQaCRgO2PHZL0P NDy1cnDvypmXID7A8rg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-25_01,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015 phishscore=0 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608250058 V6: Add findings from Sashiko - Remove cpus_read_lock() and cpus_read_unlock() invocations from CPU hotplug handlers in patch 3. V5: Add findings from Sashiko - Add cpus_read_lock() and cpus_read_unlock() in patch 3. V4: Add findings from Sumanth and updated patch 3/3. - Fix reference count for CPU hotplug remove while multiple per-task events are active. V3: Add findings from Sumanth and updated patch 3/3. - Refined Fixes: commit id and messages - Handle cpuhp_setup_state() failure V2: Add findings from Sumanth and updated patch 3/3. - handle possible NULL pointer dereference in pai_event_destroy_cpu() - handle possibe memory allocation failure in pai_online_cpu() - add Reviewed-by: Sumanth Korikkar to patch 1/3 and patch 2/3. Add support for CPU hotplug add and remove for PAI PMU. Patch 1: Change function argument list Patch 2: Move locking from CPU scope to event scope Patch 3: Add CPU hotplug handler Thomas Richter (3): s390/pai: Use PAI PMU index as parameter replacing event s390/pai: Move locking to event init and delete s390/pai: Support CPU hotplug for PMU PAI arch/s390/include/asm/pai.h | 1 - arch/s390/kernel/perf_pai.c | 182 +++++++++++++++++++++++++----------- 2 files changed, 128 insertions(+), 55 deletions(-) -- 2.55.0