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Fri, 11 Sep 2026 02:19:18 +0000 (GMT) Received: from li-4c4c4544-0054-3910-8039-c3c04f423534.ibm.com.com (unknown [9.61.103.123]) by smtpav01.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 11 Sep 2026 02:19:18 +0000 (GMT) From: Tyrel Datwyler To: james.bottomley@hansenpartnership.com, martin.petersen@oracle.com Cc: linux-scsi@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, brking@linux.ibm.com, davemarq@linux.ibm.com, Tyrel Datwyler Subject: [PATCH v9 6/9] scsi: ibmvfc: extend channel reg/dereg helpers for async sub-CRQ Date: Thu, 10 Sep 2026 19:19:06 -0700 Message-ID: <20260911021910.1038128-7-tyreld@linux.ibm.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260911021910.1038128-1-tyreld@linux.ibm.com> References: <20260911021910.1038128-1-tyreld@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-scsi@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: AW1haW4tMjYwOTExMDAyNCBTYWx0ZWRfXyQixNceANK4Z j0wmaLh7tzI/eQHNLd7BYXfjmjO0b6KnA86ICXBos16DLDNoYOPqQ+1HYyyx5fwyPxkFFKiBPhS BbjUoKOpKdazFVzpCsKHvBSE7p/WlOA= X-Proofpoint-ORIG-GUID: u5W2iSfyIuAOGOldxr47R09gbE3Nekqe X-Proofpoint-GUID: u5W2iSfyIuAOGOldxr47R09gbE3Nekqe X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTExMDAyNCBTYWx0ZWRfX0W4P6pYvXX+l HRCB8p4d6EsF0SJJ0hDHMq5x8lw0kwshFXyuCojnJQDdyAaHncG4nKbYRAo+/N7mUAt9MNuc7Uk Y41ANI3fb6LVOJytqTrGvX+7omDhz9lp91O/QyMd6acW+rp/A+20hvz6UfoKtIrlwzz2QCzfYoj GyAMu5CHXkN5RjymM9e8alIc8DQeQcAdHjwQKJIHOs0+TJA6acDL9LRmy0MLOet7idiIWvEnQEJ wQogYDdIcm/uli3AcMLNLiQGfs8zrH0SeKeYkPmQSJOC1OR3BxhTn6gjJs6NooTTYu5rga/9s+y 5zlc4K9hfbl24avDB06sja6Dyl9gNT+/YBtmqD2OxORCJnGZGRg48Pnu8ECvFzyYtPAwEBobMMP 17NXin+IOb9ygAwen+yJLfgexrHI9qK+tzvmLVT3sOinEll5/AhQdyxlXTAbe0pf6S1juOcJ1jL VZQJSrQrFYSz/JFZ8iA== X-Authority-Analysis: v=2.4 cv=PIGaavqC c=1 sm=1 tr=0 ts=6aa36529 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=tu7rfeQ3xgwDIMifKtoA: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=2026-09-11_01,2026-09-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 priorityscore=1501 bulkscore=0 adultscore=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609110024 From: Dave Marquardt ibmvfc_register_channel() and ibmvfc_deregister_channel() previously only handled indexed sub-CRQ channels drawn from the channels->scrqs[] array. The async sub-CRQ (vhost->async_sub_crq) had no registration path through these helpers, requiring separate handling. Extend both functions to accept a negative index as a sentinel value signalling that the async sub-CRQ should be operated on instead of an indexed scrq entry. When index < 0, the queue pointer is set to &vhost->async_sub_crq, the IRQ is named "ibmvfc--async", and the handler is set to ibmvfc_interrupt_async_subq rather than the per-protocol ibmvfc_interrupt_mq handler. hwq_id assignment is skipped for the async queue since it has no meaningful hardware queue index. Stopped marking ibmvfc_interrupt_async_subq as __maybe_unused. Error messages in both paths are updated to distinguish async sub-CRQ failures from indexed sub-CRQ failures. Kernel-doc headers are added to both functions documenting the negative-index convention. Signed-off-by: Dave Marquardt Acked-by: Tyrel Datwyler --- drivers/scsi/ibmvscsi/ibmvfc-core.c | 93 ++++++++++++++++++++++------- 1 file changed, 70 insertions(+), 23 deletions(-) diff --git a/drivers/scsi/ibmvscsi/ibmvfc-core.c b/drivers/scsi/ibmvscsi/ibmvfc-core.c index 553fca31cb3a..fa312a58471f 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc-core.c +++ b/drivers/scsi/ibmvscsi/ibmvfc-core.c @@ -4420,7 +4420,7 @@ static void ibmvfc_drain_async_subq(struct ibmvfc_queue *scrq) * @scrq_instance: async subq * **/ -static irqreturn_t __maybe_unused ibmvfc_interrupt_async_subq(int irq, void *scrq_instance) +static irqreturn_t ibmvfc_interrupt_async_subq(int irq, void *scrq_instance) { struct ibmvfc_queue *scrq = (struct ibmvfc_queue *)scrq_instance; @@ -6811,13 +6811,29 @@ static int ibmvfc_init_crq(struct ibmvfc_host *vhost) return retrc; } +/** + * ibmvfc_register_channel - Register a sub-CRQ channel with the hypervisor + * @vhost: ibmvfc host struct + * @channels: ibmvfc channels struct containing the channel array and protocol + * @index: index into the channels array for the queue to register, or + * a negative value to register the async sub-CRQ + * + * Register a sub-CRQ with the hypervisor via h_reg_sub_crq, map its hardware + * IRQ to a Linux IRQ, and bind an interrupt handler to it. The handler is + * selected based on the channel protocol (SCSI or NVMe) for normal queues, or + * set to the async sub-CRQ handler when @index is negative. + * + * Return value: + * 0 on success / non-zero on failure + **/ static int ibmvfc_register_channel(struct ibmvfc_host *vhost, struct ibmvfc_channels *channels, int index) { struct device *dev = vhost->dev; struct vio_dev *vdev = to_vio_dev(dev); - struct ibmvfc_queue *scrq = &channels->scrqs[index]; + bool is_async = index < 0; + struct ibmvfc_queue *scrq = !is_async ? &channels->scrqs[index] : &vhost->async_sub_crq; int rc = -ENOMEM; ENTER; @@ -6837,36 +6853,49 @@ static int ibmvfc_register_channel(struct ibmvfc_host *vhost, if (!scrq->irq) { rc = -EINVAL; - dev_err(dev, "Error mapping sub-crq[%d] irq\n", index); + if (!is_async) + dev_err(dev, "Error mapping sub-crq[%d] irq\n", index); + else + dev_err(dev, "Error mapping async sub-crq irq\n"); goto irq_failed; } - switch (channels->protocol) { - case IBMVFC_PROTO_SCSI: - snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d", - vdev->unit_address, index); - scrq->handler = ibmvfc_interrupt_mq; - break; - case IBMVFC_PROTO_NVME: - snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d", - vdev->unit_address, index); - scrq->handler = ibmvfc_interrupt_mq; - break; - default: - dev_err(dev, "Unknown channel protocol (%d)\n", - channels->protocol); - goto irq_failed; + if (!is_async) { + switch (channels->protocol) { + case IBMVFC_PROTO_SCSI: + snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-scsi%d", + vdev->unit_address, index); + scrq->handler = ibmvfc_interrupt_mq; + break; + case IBMVFC_PROTO_NVME: + snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-nvmf%d", + vdev->unit_address, index); + scrq->handler = ibmvfc_interrupt_mq; + break; + default: + dev_err(dev, "Unknown channel protocol (%d)\n", + channels->protocol); + goto irq_failed; + } + } else { + snprintf(scrq->name, sizeof(scrq->name), "ibmvfc-%x-async", + vdev->unit_address); + scrq->handler = ibmvfc_interrupt_async_subq; } rc = request_irq(scrq->irq, scrq->handler, 0, scrq->name, scrq); if (rc) { - dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index); + if (!is_async) + dev_err(dev, "Couldn't register sub-crq[%d] irq\n", index); + else + dev_err(dev, "Couldn't register async sub-crq irq\n"); irq_dispose_mapping(scrq->irq); goto irq_failed; } - scrq->hwq_id = index; + if (!is_async) + scrq->hwq_id = index; LEAVE; return 0; @@ -6880,13 +6909,26 @@ static int ibmvfc_register_channel(struct ibmvfc_host *vhost, return rc; } +/** + * ibmvfc_deregister_channel - Deregister a sub-CRQ channel with the hypervisor + * @vhost: ibmvfc host struct + * @channels: ibmvfc channels struct containing the sub-CRQ array + * @index: index into the sub-CRQ array, or -1 to deregister the + * asynchronous sub-CRQ + * + * Frees the IRQ, disposes of the IRQ mapping, and calls H_FREE_SUB_CRQ to + * release the sub-CRQ with the hypervisor. On success the queue message + * buffer is zeroed and the current index is reset. If H_FREE_SUB_CRQ fails, + * an error is logged but the channel resources are cleaned up regardless. + */ static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost, struct ibmvfc_channels *channels, int index) { struct device *dev = vhost->dev; struct vio_dev *vdev = to_vio_dev(dev); - struct ibmvfc_queue *scrq = &channels->scrqs[index]; + bool is_async = index < 0; + struct ibmvfc_queue *scrq = !is_async ? &channels->scrqs[index] : &vhost->async_sub_crq; long rc; ENTER; @@ -6900,8 +6942,13 @@ static void ibmvfc_deregister_channel(struct ibmvfc_host *vhost, scrq->cookie); } while (rc == H_BUSY || H_IS_LONG_BUSY(rc)); - if (rc) - dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", index, rc); + if (rc) { + if (!is_async) + dev_err(dev, "Failed to free sub-crq[%d]: rc=%ld\n", + index, rc); + else + dev_err(dev, "Failed to free async sub-crq: rc=%ld\n", rc); + } /* Clean out the queue */ memset(scrq->msgs.crq, 0, PAGE_SIZE); -- 2.55.0