From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3zqxDn269bzF0nc for ; Tue, 27 Feb 2018 09:23:37 +1100 (AEDT) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w1QMMCGm111546 for ; Mon, 26 Feb 2018 17:23:34 -0500 Received: from e37.co.us.ibm.com (e37.co.us.ibm.com [32.97.110.158]) by mx0a-001b2d01.pphosted.com with ESMTP id 2gcpa1k65a-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Mon, 26 Feb 2018 17:23:34 -0500 Received: from localhost by e37.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 26 Feb 2018 15:23:33 -0700 From: Uma Krishnan To: linux-scsi@vger.kernel.org, James Bottomley , "Martin K. Petersen" , "Matthew R. Ochs" , "Manoj N. Kumar" Cc: linuxppc-dev@lists.ozlabs.org, Andrew Donnellan , Frederic Barrat , Christophe Lombard Subject: [PATCH v2 25/38] cxlflash: Support AFU interrupt mapping and registration Date: Mon, 26 Feb 2018 16:23:27 -0600 In-Reply-To: <1519683513-16731-1-git-send-email-ukrishn@linux.vnet.ibm.com> References: <1519683513-16731-1-git-send-email-ukrishn@linux.vnet.ibm.com> Message-Id: <1519683807-17655-1-git-send-email-ukrishn@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Add support to map and unmap the irq space and manage irq registrations with the kernel for each allocated AFU interrupt. Also support mapping the physical trigger page to obtain an effective address that will be provided to the cxlflash core in a future commit. Signed-off-by: Uma Krishnan Acked-by: Matthew R. Ochs --- drivers/scsi/cxlflash/ocxl_hw.c | 120 ++++++++++++++++++++++++++++++++++++++++ drivers/scsi/cxlflash/ocxl_hw.h | 2 + 2 files changed, 122 insertions(+) diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c index e04dce8..177e329 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.c +++ b/drivers/scsi/cxlflash/ocxl_hw.c @@ -186,6 +186,124 @@ static int ocxlflash_process_element(void *ctx_cookie) } /** + * afu_map_irq() - map the interrupt of the adapter context + * @flags: Flags. + * @ctx: Adapter context. + * @num: Per-context AFU interrupt number. + * @handler: Interrupt handler to register. + * @cookie: Interrupt handler private data. + * @name: Name of the interrupt. + * + * Return: 0 on success, -errno on failure + */ +static int afu_map_irq(u64 flags, struct ocxlflash_context *ctx, int num, + irq_handler_t handler, void *cookie, char *name) +{ + struct ocxl_hw_afu *afu = ctx->hw_afu; + struct device *dev = afu->dev; + struct ocxlflash_irqs *irq; + void __iomem *vtrig; + u32 virq; + int rc = 0; + + if (num < 0 || num >= ctx->num_irqs) { + dev_err(dev, "%s: Interrupt %d not allocated\n", __func__, num); + rc = -ENOENT; + goto out; + } + + irq = &ctx->irqs[num]; + virq = irq_create_mapping(NULL, irq->hwirq); + if (unlikely(!virq)) { + dev_err(dev, "%s: irq_create_mapping failed\n", __func__); + rc = -ENOMEM; + goto out; + } + + rc = request_irq(virq, handler, 0, name, cookie); + if (unlikely(rc)) { + dev_err(dev, "%s: request_irq failed rc=%d\n", __func__, rc); + goto err1; + } + + vtrig = ioremap(irq->ptrig, PAGE_SIZE); + if (unlikely(!vtrig)) { + dev_err(dev, "%s: Trigger page mapping failed\n", __func__); + rc = -ENOMEM; + goto err2; + } + + irq->virq = virq; + irq->vtrig = vtrig; +out: + return rc; +err2: + free_irq(virq, cookie); +err1: + irq_dispose_mapping(virq); + goto out; +} + +/** + * ocxlflash_map_afu_irq() - map the interrupt of the adapter context + * @ctx_cookie: Adapter context. + * @num: Per-context AFU interrupt number. + * @handler: Interrupt handler to register. + * @cookie: Interrupt handler private data. + * @name: Name of the interrupt. + * + * Return: 0 on success, -errno on failure + */ +static int ocxlflash_map_afu_irq(void *ctx_cookie, int num, + irq_handler_t handler, void *cookie, + char *name) +{ + return afu_map_irq(0, ctx_cookie, num, handler, cookie, name); +} + +/** + * afu_unmap_irq() - unmap the interrupt + * @flags: Flags. + * @ctx: Adapter context. + * @num: Per-context AFU interrupt number. + * @cookie: Interrupt handler private data. + */ +static void afu_unmap_irq(u64 flags, struct ocxlflash_context *ctx, int num, + void *cookie) +{ + struct ocxl_hw_afu *afu = ctx->hw_afu; + struct device *dev = afu->dev; + struct ocxlflash_irqs *irq; + + if (num < 0 || num >= ctx->num_irqs) { + dev_err(dev, "%s: Interrupt %d not allocated\n", __func__, num); + return; + } + + irq = &ctx->irqs[num]; + if (irq->vtrig) + iounmap(irq->vtrig); + + if (irq_find_mapping(NULL, irq->hwirq)) { + free_irq(irq->virq, cookie); + irq_dispose_mapping(irq->virq); + } + + memset(irq, 0, sizeof(*irq)); +} + +/** + * ocxlflash_unmap_afu_irq() - unmap the interrupt + * @ctx_cookie: Adapter context. + * @num: Per-context AFU interrupt number. + * @cookie: Interrupt handler private data. + */ +static void ocxlflash_unmap_afu_irq(void *ctx_cookie, int num, void *cookie) +{ + return afu_unmap_irq(0, ctx_cookie, num, cookie); +} + +/** * start_context() - local routine to start a context * @ctx: Adapter context to be started. * @@ -836,6 +954,8 @@ const struct cxlflash_backend_ops cxlflash_ocxl_ops = { .psa_map = ocxlflash_psa_map, .psa_unmap = ocxlflash_psa_unmap, .process_element = ocxlflash_process_element, + .map_afu_irq = ocxlflash_map_afu_irq, + .unmap_afu_irq = ocxlflash_unmap_afu_irq, .start_context = ocxlflash_start_context, .stop_context = ocxlflash_stop_context, .set_master = ocxlflash_set_master, diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h index 500de6b..9e44ff4 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.h +++ b/drivers/scsi/cxlflash/ocxl_hw.h @@ -16,7 +16,9 @@ struct ocxlflash_irqs { int hwirq; + u32 virq; u64 ptrig; + void __iomem *vtrig; }; /* OCXL hardware AFU associated with the host */ -- 2.1.0