Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941044AbcKPUqY (ORCPT ); Wed, 16 Nov 2016 15:46:24 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:4021 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S939765AbcKPUqS (ORCPT ); Wed, 16 Nov 2016 15:46:18 -0500 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 16 Nov 2016 12:46:16 -0800 From: Kirti Wankhede To: , , , CC: , , , , , , Kirti Wankhede Subject: [PATCH v14 15/22] vfio: Introduce vfio_set_irqs_validate_and_prepare() Date: Thu, 17 Nov 2016 02:16:27 +0530 Message-ID: <1479329194-10247-16-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1479329194-10247-1-git-send-email-kwankhede@nvidia.com> References: <1479329194-10247-1-git-send-email-kwankhede@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2563 Lines: 88 Vendor driver using mediated device framework would use same mechnism to validate and prepare IRQs. Introducing this function to reduce code replication in multiple drivers. Signed-off-by: Kirti Wankhede Signed-off-by: Neo Jia Change-Id: Ie201f269dda0713ca18a07dc4852500bd8b48309 --- drivers/vfio/vfio.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/vfio.h | 4 ++++ 2 files changed, 52 insertions(+) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 82257cf30f52..2c044af09a2c 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1858,6 +1858,54 @@ int vfio_info_add_capability(struct vfio_info_cap *caps, int cap_type_id, } EXPORT_SYMBOL(vfio_info_add_capability); +int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr, int num_irqs, + int max_irq_type, size_t *data_size) +{ + unsigned long minsz; + size_t size; + + minsz = offsetofend(struct vfio_irq_set, count); + + if ((hdr->argsz < minsz) || (hdr->index >= max_irq_type) || + (hdr->count >= (U32_MAX - hdr->start)) || + (hdr->flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | + VFIO_IRQ_SET_ACTION_TYPE_MASK))) + return -EINVAL; + + if (data_size) + *data_size = 0; + + if (hdr->start >= num_irqs || hdr->start + hdr->count > num_irqs) + return -EINVAL; + + switch (hdr->flags & VFIO_IRQ_SET_DATA_TYPE_MASK) { + case VFIO_IRQ_SET_DATA_NONE: + size = 0; + break; + case VFIO_IRQ_SET_DATA_BOOL: + size = sizeof(uint8_t); + break; + case VFIO_IRQ_SET_DATA_EVENTFD: + size = sizeof(int32_t); + break; + default: + return -EINVAL; + } + + if (size) { + if (hdr->argsz - minsz < hdr->count * size) + return -EINVAL; + + if (!data_size) + return -EINVAL; + + *data_size = hdr->count * size; + } + + return 0; +} +EXPORT_SYMBOL(vfio_set_irqs_validate_and_prepare); + /* * Pin a set of guest PFNs and return their associated host PFNs for local * domain only. diff --git a/include/linux/vfio.h b/include/linux/vfio.h index e26f7ccab564..15ff0421b423 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -129,6 +129,10 @@ extern void vfio_info_cap_shift(struct vfio_info_cap *caps, size_t offset); extern int vfio_info_add_capability(struct vfio_info_cap *caps, int cap_type_id, void *cap_type); +extern int vfio_set_irqs_validate_and_prepare(struct vfio_irq_set *hdr, + int num_irqs, int max_irq_type, + size_t *data_size); + struct pci_dev; #ifdef CONFIG_EEH extern void vfio_spapr_pci_eeh_open(struct pci_dev *pdev); -- 2.7.0