From patchwork Fri May 4 19:26:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 10381473 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 03D0A60159 for ; Fri, 4 May 2018 19:31:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DDBFF29745 for ; Fri, 4 May 2018 19:31:00 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DB6FB2974D; Fri, 4 May 2018 19:31:00 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id AE87E2969E for ; Fri, 4 May 2018 19:30:39 +0000 (UTC) Received: from localhost ([::1]:36198 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fEgPe-0005TY-WD for patchwork-qemu-devel@patchwork.kernel.org; Fri, 04 May 2018 15:30:39 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35868) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fEgLX-0001Ya-Uk for qemu-devel@nongnu.org; Fri, 04 May 2018 15:26:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fEgLW-0006oc-6m for qemu-devel@nongnu.org; Fri, 04 May 2018 15:26:23 -0400 Received: from smtp03.citrix.com ([162.221.156.55]:53759) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fEgLQ-0006hQ-1S; Fri, 04 May 2018 15:26:16 -0400 X-IronPort-AV: E=Sophos;i="5.49,363,1520899200"; d="scan'208";a="53727420" From: Paul Durrant To: , , Date: Fri, 4 May 2018 20:26:01 +0100 Message-ID: <1525461967-32174-3-git-send-email-paul.durrant@citrix.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1525461967-32174-1-git-send-email-paul.durrant@citrix.com> References: <1525461967-32174-1-git-send-email-paul.durrant@citrix.com> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 162.221.156.55 Subject: [Qemu-devel] [PATCH v3 2/8] xen_disk: remove open-coded use of libxengnttab X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Anthony Perard , Kevin Wolf , Paul Durrant , Stefano Stabellini , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Now that helpers are present in xen_backend, this patch removes open-coded calls to libxengnttab from the xen_disk code. This patch also fixes one whitspace error in the assignment of the XenDevOps initialise method. Signed-off-by: Paul Durrant Acked-by: Anthony PERARD --- Cc: Stefano Stabellini Cc: Anthony Perard Cc: Kevin Wolf Cc: Max Reitz v2: - New in v2 --- hw/block/xen_disk.c | 122 ++++++++++++++-------------------------------------- 1 file changed, 32 insertions(+), 90 deletions(-) diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c index f74fcd4..66ed2b7 100644 --- a/hw/block/xen_disk.c +++ b/hw/block/xen_disk.c @@ -68,7 +68,6 @@ struct ioreq { uint8_t mapped; /* grant mapping */ - uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST]; uint32_t refs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; int prot; void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST]; @@ -142,7 +141,6 @@ static void ioreq_reset(struct ioreq *ioreq) ioreq->presync = 0; ioreq->mapped = 0; - memset(ioreq->domids, 0, sizeof(ioreq->domids)); memset(ioreq->refs, 0, sizeof(ioreq->refs)); ioreq->prot = 0; memset(ioreq->page, 0, sizeof(ioreq->page)); @@ -168,16 +166,12 @@ static gint int_cmp(gconstpointer a, gconstpointer b, gpointer user_data) static void destroy_grant(gpointer pgnt) { PersistentGrant *grant = pgnt; - xengnttab_handle *gnt = grant->blkdev->xendev.gnttabdev; + struct XenBlkDev *blkdev = grant->blkdev; + struct XenDevice *xendev = &blkdev->xendev; - if (xengnttab_unmap(gnt, grant->page, 1) != 0) { - xen_pv_printf(&grant->blkdev->xendev, 0, - "xengnttab_unmap failed: %s\n", - strerror(errno)); - } + xen_be_unmap_grant_ref(xendev, grant->page); grant->blkdev->persistent_gnt_count--; - xen_pv_printf(&grant->blkdev->xendev, 3, - "unmapped grant %p\n", grant->page); + xen_pv_printf(xendev, 3, "unmapped grant %p\n", grant->page); g_free(grant); } @@ -185,15 +179,10 @@ static void remove_persistent_region(gpointer data, gpointer dev) { PersistentRegion *region = data; struct XenBlkDev *blkdev = dev; - xengnttab_handle *gnt = blkdev->xendev.gnttabdev; + struct XenDevice *xendev = &blkdev->xendev; - if (xengnttab_unmap(gnt, region->addr, region->num) != 0) { - xen_pv_printf(&blkdev->xendev, 0, - "xengnttab_unmap region %p failed: %s\n", - region->addr, strerror(errno)); - } - xen_pv_printf(&blkdev->xendev, 3, - "unmapped grant region %p with %d pages\n", + xen_be_unmap_grant_refs(xendev, region->addr, region->num); + xen_pv_printf(xendev, 3, "unmapped grant region %p with %d pages\n", region->addr, region->num); g_free(region); } @@ -304,7 +293,6 @@ static int ioreq_parse(struct ioreq *ioreq) goto err; } - ioreq->domids[i] = blkdev->xendev.dom; ioreq->refs[i] = ioreq->req.seg[i].gref; mem = ioreq->req.seg[i].first_sect * blkdev->file_blk; @@ -324,7 +312,8 @@ err: static void ioreq_unmap(struct ioreq *ioreq) { - xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev; + struct XenBlkDev *blkdev = ioreq->blkdev; + struct XenDevice *xendev = &blkdev->xendev; int i; if (ioreq->num_unmap == 0 || ioreq->mapped == 0) { @@ -334,11 +323,7 @@ static void ioreq_unmap(struct ioreq *ioreq) if (!ioreq->pages) { return; } - if (xengnttab_unmap(gnt, ioreq->pages, ioreq->num_unmap) != 0) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, - "xengnttab_unmap failed: %s\n", - strerror(errno)); - } + xen_be_unmap_grant_refs(xendev, ioreq->pages, ioreq->num_unmap); ioreq->blkdev->cnt_map -= ioreq->num_unmap; ioreq->pages = NULL; } else { @@ -346,11 +331,7 @@ static void ioreq_unmap(struct ioreq *ioreq) if (!ioreq->page[i]) { continue; } - if (xengnttab_unmap(gnt, ioreq->page[i], 1) != 0) { - xen_pv_printf(&ioreq->blkdev->xendev, 0, - "xengnttab_unmap failed: %s\n", - strerror(errno)); - } + xen_be_unmap_grant_ref(xendev, ioreq->page[i]); ioreq->blkdev->cnt_map--; ioreq->page[i] = NULL; } @@ -360,14 +341,14 @@ static void ioreq_unmap(struct ioreq *ioreq) static int ioreq_map(struct ioreq *ioreq) { - xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev; - uint32_t domids[BLKIF_MAX_SEGMENTS_PER_REQUEST]; + struct XenBlkDev *blkdev = ioreq->blkdev; + struct XenDevice *xendev = &blkdev->xendev; uint32_t refs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; void *page[BLKIF_MAX_SEGMENTS_PER_REQUEST]; int i, j, new_maps = 0; PersistentGrant *grant; PersistentRegion *region; - /* domids and refs variables will contain the information necessary + /* refs variable will contain the information necessary * to map the grants that are needed to fulfill this request. * * After mapping the needed grants, the page array will contain the @@ -392,7 +373,6 @@ static int ioreq_map(struct ioreq *ioreq) /* Add the grant to the list of grants that * should be mapped */ - domids[new_maps] = ioreq->domids[i]; refs[new_maps] = ioreq->refs[i]; page[i] = NULL; new_maps++; @@ -405,14 +385,13 @@ static int ioreq_map(struct ioreq *ioreq) } else { /* All grants in the request should be mapped */ memcpy(refs, ioreq->refs, sizeof(refs)); - memcpy(domids, ioreq->domids, sizeof(domids)); memset(page, 0, sizeof(page)); new_maps = ioreq->v.niov; } if (batch_maps && new_maps) { - ioreq->pages = xengnttab_map_grant_refs - (gnt, new_maps, domids, refs, ioreq->prot); + ioreq->pages = xen_be_map_grant_refs(xendev, refs, new_maps, + ioreq->prot); if (ioreq->pages == NULL) { xen_pv_printf(&ioreq->blkdev->xendev, 0, "can't map %d grant refs (%s, %d maps)\n", @@ -427,8 +406,8 @@ static int ioreq_map(struct ioreq *ioreq) ioreq->blkdev->cnt_map += new_maps; } else if (new_maps) { for (i = 0; i < new_maps; i++) { - ioreq->page[i] = xengnttab_map_grant_ref - (gnt, domids[i], refs[i], ioreq->prot); + ioreq->page[i] = xen_be_map_grant_ref(xendev, refs[i], + ioreq->prot); if (ioreq->page[i] == NULL) { xen_pv_printf(&ioreq->blkdev->xendev, 0, "can't map grant ref %d (%s, %d maps)\n", @@ -529,10 +508,12 @@ static int ioreq_init_copy_buffers(struct ioreq *ioreq) static int ioreq_grant_copy(struct ioreq *ioreq) { - xengnttab_handle *gnt = ioreq->blkdev->xendev.gnttabdev; - xengnttab_grant_copy_segment_t segs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; + struct XenBlkDev *blkdev = ioreq->blkdev; + struct XenDevice *xendev = &blkdev->xendev; + XenGrantCopySegment segs[BLKIF_MAX_SEGMENTS_PER_REQUEST]; int i, count, rc; int64_t file_blk = ioreq->blkdev->file_blk; + bool to_domain = (ioreq->req.operation == BLKIF_OP_READ); if (ioreq->v.niov == 0) { return 0; @@ -541,16 +522,12 @@ static int ioreq_grant_copy(struct ioreq *ioreq) count = ioreq->v.niov; for (i = 0; i < count; i++) { - if (ioreq->req.operation == BLKIF_OP_READ) { - segs[i].flags = GNTCOPY_dest_gref; + if (to_domain) { segs[i].dest.foreign.ref = ioreq->refs[i]; - segs[i].dest.foreign.domid = ioreq->domids[i]; segs[i].dest.foreign.offset = ioreq->req.seg[i].first_sect * file_blk; segs[i].source.virt = ioreq->v.iov[i].iov_base; } else { - segs[i].flags = GNTCOPY_source_gref; segs[i].source.foreign.ref = ioreq->refs[i]; - segs[i].source.foreign.domid = ioreq->domids[i]; segs[i].source.foreign.offset = ioreq->req.seg[i].first_sect * file_blk; segs[i].dest.virt = ioreq->v.iov[i].iov_base; } @@ -558,7 +535,7 @@ static int ioreq_grant_copy(struct ioreq *ioreq) - ioreq->req.seg[i].first_sect + 1) * file_blk; } - rc = xengnttab_grant_copy(gnt, count, segs); + rc = xen_be_copy_grant_refs(xendev, to_domain, segs, count); if (rc) { xen_pv_printf(&ioreq->blkdev->xendev, 0, @@ -567,16 +544,6 @@ static int ioreq_grant_copy(struct ioreq *ioreq) return -1; } - for (i = 0; i < count; i++) { - if (segs[i].status != GNTST_okay) { - xen_pv_printf(&ioreq->blkdev->xendev, 3, - "failed to copy data %d for gref %d, domid %d\n", - segs[i].status, ioreq->refs[i], ioreq->domids[i]); - ioreq->aio_errors++; - rc = -1; - } - } - return rc; } #else @@ -1085,7 +1052,6 @@ static int blk_connect(struct XenDevice *xendev) int order, ring_ref; unsigned int ring_size, max_grants; unsigned int i; - uint32_t *domids; trace_xen_disk_connect(xendev->name); @@ -1247,31 +1213,11 @@ static int blk_connect(struct XenDevice *xendev) /* Add on the number needed for the ring pages */ max_grants += blkdev->nr_ring_ref; - blkdev->xendev.gnttabdev = xengnttab_open(NULL, 0); - if (blkdev->xendev.gnttabdev == NULL) { - xen_pv_printf(xendev, 0, "xengnttab_open failed: %s\n", - strerror(errno)); - return -1; - } - if (xengnttab_set_max_grants(blkdev->xendev.gnttabdev, max_grants)) { - xen_pv_printf(xendev, 0, "xengnttab_set_max_grants failed: %s\n", - strerror(errno)); - return -1; - } - - domids = g_new0(uint32_t, blkdev->nr_ring_ref); - for (i = 0; i < blkdev->nr_ring_ref; i++) { - domids[i] = blkdev->xendev.dom; - } - - blkdev->sring = xengnttab_map_grant_refs(blkdev->xendev.gnttabdev, - blkdev->nr_ring_ref, - domids, - blkdev->ring_ref, - PROT_READ | PROT_WRITE); - - g_free(domids); + xen_be_set_max_grant_refs(xendev, max_grants); + blkdev->sring = xen_be_map_grant_refs(xendev, blkdev->ring_ref, + blkdev->nr_ring_ref, + PROT_READ | PROT_WRITE); if (!blkdev->sring) { return -1; } @@ -1344,8 +1290,8 @@ static void blk_disconnect(struct XenDevice *xendev) aio_context_release(blkdev->ctx); if (blkdev->sring) { - xengnttab_unmap(blkdev->xendev.gnttabdev, blkdev->sring, - blkdev->nr_ring_ref); + xen_be_unmap_grant_refs(xendev, blkdev->sring, + blkdev->nr_ring_ref); blkdev->cnt_map--; blkdev->sring = NULL; } @@ -1369,11 +1315,6 @@ static void blk_disconnect(struct XenDevice *xendev) } blkdev->feature_persistent = false; } - - if (blkdev->xendev.gnttabdev) { - xengnttab_close(blkdev->xendev.gnttabdev); - blkdev->xendev.gnttabdev = NULL; - } } static int blk_free(struct XenDevice *xendev) @@ -1410,10 +1351,11 @@ static void blk_event(struct XenDevice *xendev) } struct XenDevOps xen_blkdev_ops = { + .flags = DEVOPS_FLAG_NEED_GNTDEV, .size = sizeof(struct XenBlkDev), .alloc = blk_alloc, .init = blk_init, - .initialise = blk_connect, + .initialise = blk_connect, .disconnect = blk_disconnect, .event = blk_event, .free = blk_free,