From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:45090 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728370AbeLJRNf (ORCPT ); Mon, 10 Dec 2018 12:13:35 -0500 From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com Subject: [PATCH 17/52] virtio-fs: Retrieve shm capabilities for cache Date: Mon, 10 Dec 2018 12:12:43 -0500 Message-Id: <20181210171318.16998-18-vgoyal@redhat.com> In-Reply-To: <20181210171318.16998-1-vgoyal@redhat.com> References: <20181210171318.16998-1-vgoyal@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Retrieve the capabilities needed to find the cache. Signed-off-by: Dr. David Alan Gilbert --- fs/fuse/virtio_fs.c | 15 +++++++++++++++ include/uapi/linux/virtio_fs.h | 3 +++ 2 files changed, 18 insertions(+) diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c index cd916943205e..60d496c16841 100644 --- a/fs/fuse/virtio_fs.c +++ b/fs/fuse/virtio_fs.c @@ -520,6 +520,8 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) phys_addr_t phys_addr; size_t len; int ret; + u8 have_cache, cache_bar; + u64 cache_offset, cache_len; if (!IS_ENABLED(CONFIG_DAX_DRIVER)) return 0; @@ -535,6 +537,19 @@ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) if (ret < 0) return ret; + have_cache = virtio_pci_find_shm_cap(pci_dev, + VIRTIO_FS_PCI_SHMCAP_ID_CACHE, &cache_bar, + &cache_offset, &cache_len); + + if (!have_cache) { + dev_err(&vdev->dev, "%s: No cache capability\n", + __func__); + return -ENXIO; + } else { + dev_notice(&vdev->dev, "Cache bar: %d len: 0x%llx @ 0x%llx\n", + cache_bar, cache_len, cache_offset); + } + /* TODO handle case where device doesn't expose BAR? */ ret = pci_request_region(pci_dev, VIRTIO_FS_WINDOW_BAR, "virtio-fs-window"); diff --git a/include/uapi/linux/virtio_fs.h b/include/uapi/linux/virtio_fs.h index 48f3590dcfbe..65a9d4a0dac0 100644 --- a/include/uapi/linux/virtio_fs.h +++ b/include/uapi/linux/virtio_fs.h @@ -38,4 +38,7 @@ struct virtio_fs_config { __u32 num_queues; } __attribute__((packed)); +/* For the id field in virtio_pci_shm_cap */ +#define VIRTIO_FS_PCI_SHMCAP_ID_CACHE 0 + #endif /* _UAPI_LINUX_VIRTIO_FS_H */ -- 2.13.6