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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:InfoNoRecords; CAT:NONE; SFS:(13230016)(4636009)(39860400002)(136003)(346002)(376002)(396003)(40470700004)(36840700001)(46966006)(86362001)(41300700001)(110136005)(921005)(356005)(82310400005)(36756003)(2616005)(81166007)(83380400001)(1076003)(186003)(5660300002)(426003)(47076005)(336012)(6666004)(7406005)(8676002)(2906002)(26005)(316002)(8936002)(70586007)(40480700001)(478600001)(54906003)(7416002)(4326008)(82740400003)(36860700001)(40460700003)(70206006)(7696005)(83996005)(2101003)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2022 02:04:17.0287 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f6b1109a-5add-4a94-dccb-08da6c4fa61d X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[12.22.5.236]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT016.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR12MB2409 X-Mailman-Approved-At: Thu, 04 Aug 2022 13:37:57 +0000 Subject: [Intel-gfx] [PATCH v4 04/10] vfio/ccw: Only pass in contiguous pages X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, intel-gfx@lists.freedesktop.org, jchrist@linux.ibm.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, terrence.xu@intel.com, intel-gvt-dev@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This driver is the only caller of vfio_pin/unpin_pages that might pass in a non-contiguous PFN list, but in many cases it has a contiguous PFN list to process. So letting VFIO API handle a non-contiguous PFN list is actually counterproductive. Add a pair of simple loops to pass in contiguous PFNs only, to have an efficient implementation in VFIO. Reviewed-by: Jason Gunthorpe Reviewed-by: Eric Farman Tested-by: Eric Farman Signed-off-by: Nicolin Chen --- drivers/s390/cio/vfio_ccw_cp.c | 70 +++++++++++++++++++++++++++------- 1 file changed, 56 insertions(+), 14 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index 0c2be9421ab7..3b94863ad24e 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -90,6 +90,38 @@ static int pfn_array_alloc(struct pfn_array *pa, u64 iova, unsigned int len) return 0; } +/* + * pfn_array_unpin() - Unpin user pages in memory + * @pa: pfn_array on which to perform the operation + * @vdev: the vfio device to perform the operation + * @pa_nr: number of user pages to unpin + * + * Only unpin if any pages were pinned to begin with, i.e. pa_nr > 0, + * otherwise only clear pa->pa_nr + */ +static void pfn_array_unpin(struct pfn_array *pa, + struct vfio_device *vdev, int pa_nr) +{ + int unpinned = 0, npage = 1; + + while (unpinned < pa_nr) { + unsigned long *first = &pa->pa_iova_pfn[unpinned]; + unsigned long *last = &first[npage]; + + if (unpinned + npage < pa_nr && + *first + npage == *last) { + npage++; + continue; + } + + vfio_unpin_pages(vdev, first, npage); + unpinned += npage; + npage = 1; + } + + pa->pa_nr = 0; +} + /* * pfn_array_pin() - Pin user pages in memory * @pa: pfn_array on which to perform the operation @@ -101,34 +133,44 @@ static int pfn_array_alloc(struct pfn_array *pa, u64 iova, unsigned int len) */ static int pfn_array_pin(struct pfn_array *pa, struct vfio_device *vdev) { + int pinned = 0, npage = 1; int ret = 0; - ret = vfio_pin_pages(vdev, pa->pa_iova_pfn, pa->pa_nr, - IOMMU_READ | IOMMU_WRITE, pa->pa_pfn); + while (pinned < pa->pa_nr) { + unsigned long *first = &pa->pa_iova_pfn[pinned]; + unsigned long *last = &first[npage]; - if (ret < 0) { - goto err_out; - } else if (ret > 0 && ret != pa->pa_nr) { - vfio_unpin_pages(vdev, pa->pa_iova_pfn, ret); - ret = -EINVAL; - goto err_out; + if (pinned + npage < pa->pa_nr && + *first + npage == *last) { + npage++; + continue; + } + + ret = vfio_pin_pages(vdev, first, npage, + IOMMU_READ | IOMMU_WRITE, + &pa->pa_pfn[pinned]); + if (ret < 0) { + goto err_out; + } else if (ret > 0 && ret != npage) { + pinned += ret; + ret = -EINVAL; + goto err_out; + } + pinned += npage; + npage = 1; } return ret; err_out: - pa->pa_nr = 0; - + pfn_array_unpin(pa, vdev, pinned); return ret; } /* Unpin the pages before releasing the memory. */ static void pfn_array_unpin_free(struct pfn_array *pa, struct vfio_device *vdev) { - /* Only unpin if any pages were pinned to begin with */ - if (pa->pa_nr) - vfio_unpin_pages(vdev, pa->pa_iova_pfn, pa->pa_nr); - pa->pa_nr = 0; + pfn_array_unpin(pa, vdev, pa->pa_nr); kfree(pa->pa_iova_pfn); }