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Mon, 24 Aug 2026 13:17:55 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 24 Aug 2026 13:17:55 +0000 (GMT) From: Thomas Richter To: linux-s390@vger.kernel.org Cc: Thomas Richter Subject: [PATCH 0/3 v5] Add CPU hotplug support for PAI PMU Date: Mon, 24 Aug 2026 15:17:48 +0200 Message-ID: <20260824131751.179275-1-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-Proofpoint-Spam-Info: AW1haW4tMjYwODI0MDEwOSBTYWx0ZWRfX6V2d01hpltkc AaJxz7pXPwJntBupSy6oIHKjielgB33BAxEO0CL6Hwgxxdh0SpQcQjkDnqPgABy6449TQ+py6Or VuaMsz+nm4CO964lpcCeTwaDqtN3uts= X-Proofpoint-GUID: 1X6jJI23EH-m6ZrkPeM1xb0m3261cOlo X-Proofpoint-ORIG-GUID: 1X6jJI23EH-m6ZrkPeM1xb0m3261cOlo X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI0MDEwOSBTYWx0ZWRfXxDVvAk9X5otx ytmTJqjBwfc3WtDhNWIegAwe8HVfATA6cRZcuik52ID/DYzYpcK5bFrNzJP2aLY23SqRq24JVF9 JymjDgTg42beBwp2KF+qNZC5+12BPPllt6ksQ7riFcw53qIc/5jp1DaI3wyw2aeGDgUhoaUNva7 359rLCqUCLooiPAbzkvJAVzOzUNjt1kFagwYX9x3KFwmvo3DsmUL4ZownzZv9M6brRVThzsZ4nz hzYqeyMHf3DBF/Gcj8y9KeTt9I1UXhdNSFbPOXpUA/pOhXs9PMflmB+CoNJNWmryqdV5znmPLJ7 TanpqToOQuFjsLb3dV3Ze66J+fQifRmVHYpLzvrxGFKSqr/gu4hxX3SrpbUNaQoW+fFyNVQbl3g Rd6tgUK+WtbMpA4xS/eNqSLsUEp8ZdsD+hELv20gHpSaX04KRcPBUTxw4oqKbJBHn4VGR1blH55 HPEOuNDE9kdUNMzTqfg== X-Authority-Analysis: v=2.4 cv=H7brBeYi c=1 sm=1 tr=0 ts=6a8c4488 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=lQW9TJnzQ4aT2Au-fZ0A:9 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=2026-08-24_04,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 bulkscore=0 adultscore=0 priorityscore=1501 clxscore=1015 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608240109 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 | 186 +++++++++++++++++++++++++----------- 2 files changed, 132 insertions(+), 55 deletions(-) -- 2.55.0