Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941645AbcJZVaA (ORCPT ); Wed, 26 Oct 2016 17:30:00 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:2143 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S941469AbcJZV34 (ORCPT ); Wed, 26 Oct 2016 17:29:56 -0400 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Wed, 26 Oct 2016 02:29:30 -0700 From: Kirti Wankhede To: , , , CC: , , , , , , Kirti Wankhede Subject: [PATCH v10 13/19] vfio: Introduce vfio_set_irqs_validate_and_prepare() Date: Thu, 27 Oct 2016 02:59:20 +0530 Message-ID: <1477517366-27871-14-git-send-email-kwankhede@nvidia.com> X-Mailer: git-send-email 2.7.0 In-Reply-To: <1477517366-27871-1-git-send-email-kwankhede@nvidia.com> References: <1477517366-27871-1-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: 2420 Lines: 79 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 | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/vfio.h | 4 ++++ 2 files changed, 43 insertions(+) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index 54d3dd71b783..9fd278155640 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1858,6 +1858,45 @@ 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; + + minsz = offsetofend(struct vfio_irq_set, count); + + if ((hdr->argsz < minsz) || (hdr->index >= max_irq_type) || + (hdr->flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK | + VFIO_IRQ_SET_ACTION_TYPE_MASK))) + return -EINVAL; + + if (data_size) + *data_size = 0; + + if (!(hdr->flags & VFIO_IRQ_SET_DATA_NONE)) { + size_t size; + + if (hdr->flags & VFIO_IRQ_SET_DATA_BOOL) + size = sizeof(uint8_t); + else if (hdr->flags & VFIO_IRQ_SET_DATA_EVENTFD) + size = sizeof(int32_t); + else + return -EINVAL; + + if ((hdr->argsz - minsz < hdr->count * size) || + (hdr->start >= num_irqs) || + (hdr->start + hdr->count > num_irqs)) + 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 diff --git a/include/linux/vfio.h b/include/linux/vfio.h index 8e2141d4601b..034c396c1706 100644 --- a/include/linux/vfio.h +++ b/include/linux/vfio.h @@ -114,6 +114,10 @@ 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