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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::530; envelope-from=paolo.bonzini@gmail.com; helo=mail-ed1-x530.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" I/O to a disk via read/write is not limited by the number of segments allow= ed by the host adapter; the kernel can split requests if needed, and the limit imposed by the host adapter can be very low (256k or so) to avoid that SG_IO returns EINVAL if memory is heavily fragmented. Since this value is only interesting for SG_IO-based I/O, do not include it in the max_transfer and only take it into account when patching the block limits VPD page in the scsi-generic device. Signed-off-by: Paolo Bonzini --- block/file-posix.c | 3 +-- hw/scsi/scsi-generic.c | 6 ++++-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 20e14f8e96..9e316a2a97 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1252,8 +1252,7 @@ static void raw_refresh_limits(BlockDriverState *bs, = Error **errp) =20 ret =3D sg_get_max_segments(s->fd); if (ret > 0) { - bs->bl.max_transfer =3D MIN(bs->bl.max_transfer, - ret * qemu_real_host_page_size); + bs->bl.max_iov =3D ret; } } =20 diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c index 98c30c5d5c..82e1e2ee79 100644 --- a/hw/scsi/scsi-generic.c +++ b/hw/scsi/scsi-generic.c @@ -179,10 +179,12 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq = *r, SCSIDevice *s) (r->req.cmd.buf[1] & 0x01)) { page =3D r->req.cmd.buf[2]; if (page =3D=3D 0xb0) { - uint32_t max_transfer =3D - blk_get_max_transfer(s->conf.blk) / s->blocksize; + uint32_t max_transfer =3D blk_get_max_transfer(s->conf.blk); + uint32_t max_iov =3D blk_get_max_iov(s->conf.blk); =20 assert(max_transfer); + max_transfer =3D MIN_NON_ZERO(max_transfer, max_iov * qemu_rea= l_host_page_size) + / s->blocksize; stl_be_p(&r->buf[8], max_transfer); /* Also take care of the opt xfer len. */ stl_be_p(&r->buf[12], --=20 2.30.1 From nobody Sun May 19 03:02:43 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1618490692; cv=none; d=zohomail.com; s=zohoarc; b=kOudX+WA3SpNi//YyJoXMII183JW2gCNrySLxMaSMBEFUjS9nC0H0ofsRc7WzeMM0uTEYJ80d/pBYqwh6BZub2vGzUkITMeUcHeyTyIGLlspgVcqn7SC6In5HdjS8cT9TkTqbn9oIXqjsdKj88vCawmXGJdIK4tkMGgrSuuS2Sw= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1618490692; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::633; envelope-from=paolo.bonzini@gmail.com; helo=mail-ej1-x633.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" bs->sg is only true for character devices, but block devices can also be used with scsi-block and scsi-generic. Unfortunately BLKSECTGET returns bytes for /dev/sgN devices and sectors for block devices, so account for that in the code. The maximum transfer also need not be a power of 2 (for example I have seen disks with 1280 KiB maximum transfer) so there's no need to pass the result through pow2floor. Signed-off-by: Paolo Bonzini --- block/file-posix.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 9e316a2a97..e37a6bb8de 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1173,13 +1173,13 @@ static void raw_reopen_abort(BDRVReopenState *state) s->reopen_state =3D NULL; } =20 -static int sg_get_max_transfer_length(int fd) +static int sg_get_max_transfer_length(int fd, struct stat *st) { #ifdef BLKSECTGET int max_bytes =3D 0; =20 if (ioctl(fd, BLKSECTGET, &max_bytes) =3D=3D 0) { - return max_bytes; + return S_ISBLK(st->st_mode) ? max_bytes * 512 : max_bytes; } else { return -errno; } @@ -1188,7 +1188,7 @@ static int sg_get_max_transfer_length(int fd) #endif } =20 -static int sg_get_max_segments(int fd) +static int sg_get_max_segments(int fd, struct stat *st) { #ifdef CONFIG_LINUX char buf[32]; @@ -1197,15 +1197,9 @@ static int sg_get_max_segments(int fd) int ret; int sysfd =3D -1; long max_segments; - struct stat st; - - if (fstat(fd, &st)) { - ret =3D -errno; - goto out; - } =20 sysfspath =3D g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments= ", - major(st.st_rdev), minor(st.st_rdev)); + major(st->st_rdev), minor(st->st_rdev)); sysfd =3D open(sysfspath, O_RDONLY); if (sysfd =3D=3D -1) { ret =3D -errno; @@ -1242,15 +1236,20 @@ out: static void raw_refresh_limits(BlockDriverState *bs, Error **errp) { BDRVRawState *s =3D bs->opaque; + struct stat st; + + if (fstat(s->fd, &st)) { + return; + } =20 - if (bs->sg) { - int ret =3D sg_get_max_transfer_length(s->fd); + if (bs->sg || S_ISBLK(st.st_mode)) { + int ret =3D sg_get_max_transfer_length(s->fd, &st); =20 if (ret > 0 && ret <=3D BDRV_REQUEST_MAX_BYTES) { - bs->bl.max_transfer =3D pow2floor(ret); + bs->bl.max_transfer =3D ret; } =20 - ret =3D sg_get_max_segments(s->fd); + ret =3D sg_get_max_segments(s->fd, &st); if (ret > 0) { bs->bl.max_iov =3D ret; } --=20 2.30.1 From nobody Sun May 19 03:02:43 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::630; envelope-from=paolo.bonzini@gmail.com; helo=mail-ej1-x630.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.25, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Even though it was only called for devices that have bs->sg set (which must be character devices), sg_get_max_segments looked at /sys/dev/block which only works for block devices. On Linux the sg driver has its own way to provide the maximum number of iovecs in a scatter/gather list. --- block/file-posix.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index e37a6bb8de..b348b37ccb 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1198,6 +1198,17 @@ static int sg_get_max_segments(int fd, struct stat *= st) int sysfd =3D -1; long max_segments; =20 + if (S_ISCHR(st->st_mode)) { + if (ioctl(fd, SG_GET_SG_TABLESIZE, &ret) =3D=3D 0) { + return ret; + } + return -EIO; + } + + if (!S_ISBLK(st->st_mode)) { + return -ENOTSUP; + } + sysfspath =3D g_strdup_printf("/sys/dev/block/%u:%u/queue/max_segments= ", major(st->st_rdev), minor(st->st_rdev)); sysfd =3D open(sysfspath, O_RDONLY); --=20 2.30.1