From patchwork Fri May 5 09:00:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 758914 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3wK5WS0XT9z9s0m for ; Fri, 5 May 2017 19:02:28 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="rtS4u/ek"; dkim-atps=neutral Received: from localhost ([::1]:45763 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d6Z85-0003Ym-Kn for incoming@patchwork.ozlabs.org; Fri, 05 May 2017 05:02:25 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59888) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d6Z75-00037o-16 for qemu-devel@nongnu.org; Fri, 05 May 2017 05:01:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d6Z74-0004vW-5T for qemu-devel@nongnu.org; Fri, 05 May 2017 05:01:23 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:52753) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d6Z6z-0004n7-DB; Fri, 05 May 2017 05:01:17 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Message-Id:Date:Subject:Cc:To:From: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=IFMM8rTyV8GQGwcC8Ey47F6DJYbsnsDxcR9Oii/U4c4=; b=rtS4u/ekLYABgqZ8VeMmC2e8F llZ/YbUtQWIhpVYvZpJ5uc52gzo4J3ObLRRCYRfKC0o3fGliFHc0wIs49k8/yewrBMHydACrLzIGQ 66OvVYrYZafwoiVgDzzRS+xchLo2KxKWqMuWOnQ6EY9R25ZMVZrwoqHqWtLAvO9N2OdlTU0aXAxtX OAk3Rg5FOlehJWTtkeu0RaZ+ciNpD36K225pxQtBuz92Q+ggmjhZBv4MboI7+RD+lDBTCdNwKjU4W djo2TRhNv6HYbnkZ0+yc/yPrsJyOYyvFeVYBML9bOmjd7NZkMi3iaxMYO2AsvbTozGWhbo7EDHDJ3 BTodSNwUw==; Received: from [85.235.16.11] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1d6Z6X-00086y-43; Fri, 05 May 2017 09:00:49 +0000 From: Christoph Hellwig To: keith.busch@intel.com, kwolf@redhat.com, mreitz@redhat.com Date: Fri, 5 May 2017 11:00:44 +0200 Message-Id: <20170505090044.28754-1-hch@lst.de> X-Mailer: git-send-email 2.11.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 65.50.211.133 Subject: [Qemu-devel] [PATCH] nvme: Implement Write Zeroes 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: qemu-devel@nongnu.org, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Keith Busch [hch: ported over from qemu-nvme.git to mainline] Signed-off-by: Christoph Hellwig --- hw/block/nvme.c | 26 ++++++++++++++++++++++++++ hw/block/nvme.h | 1 + 2 files changed, 27 insertions(+) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index ae303d44e5..3f4d2bf2ba 100644 --- a/hw/block/nvme.c +++ b/hw/block/nvme.c @@ -227,6 +227,29 @@ static uint16_t nvme_flush(NvmeCtrl *n, NvmeNamespace *ns, NvmeCmd *cmd, return NVME_NO_COMPLETE; } +static uint16_t nvme_write_zeros(NvmeCtrl *n, NvmeNamespace *ns, NvmeCmd *cmd, + NvmeRequest *req) +{ + NvmeRwCmd *rw = (NvmeRwCmd *)cmd; + const uint8_t lba_index = NVME_ID_NS_FLBAS_INDEX(ns->id_ns.flbas); + const uint8_t data_shift = ns->id_ns.lbaf[lba_index].ds; + uint64_t slba = le64_to_cpu(rw->slba); + uint32_t nlb = le16_to_cpu(rw->nlb) + 1; + uint64_t aio_slba = slba << (data_shift - BDRV_SECTOR_BITS); + uint32_t aio_nlb = nlb << (data_shift - BDRV_SECTOR_BITS); + + if (slba + nlb > ns->id_ns.nsze) { + return NVME_LBA_RANGE | NVME_DNR; + } + + req->has_sg = false; + block_acct_start(blk_get_stats(n->conf.blk), &req->acct, 0, + BLOCK_ACCT_WRITE); + req->aiocb = blk_aio_pwrite_zeroes(n->conf.blk, aio_slba, aio_nlb, 0, + nvme_rw_cb, req); + return NVME_NO_COMPLETE; +} + static uint16_t nvme_rw(NvmeCtrl *n, NvmeNamespace *ns, NvmeCmd *cmd, NvmeRequest *req) { @@ -279,6 +302,8 @@ static uint16_t nvme_io_cmd(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req) switch (cmd->opcode) { case NVME_CMD_FLUSH: return nvme_flush(n, ns, cmd, req); + case NVME_CMD_WRITE_ZEROS: + return nvme_write_zeros(n, ns, cmd, req); case NVME_CMD_WRITE: case NVME_CMD_READ: return nvme_rw(n, ns, cmd, req); @@ -895,6 +920,7 @@ static int nvme_init(PCIDevice *pci_dev) id->sqes = (0x6 << 4) | 0x6; id->cqes = (0x4 << 4) | 0x4; id->nn = cpu_to_le32(n->num_namespaces); + id->oncs = cpu_to_le16(NVME_ONCS_WRITE_ZEROS); id->psd[0].mp = cpu_to_le16(0x9c4); id->psd[0].enlat = cpu_to_le32(0x10); id->psd[0].exlat = cpu_to_le32(0x4); diff --git a/hw/block/nvme.h b/hw/block/nvme.h index 8fb0c10756..a0d15649f9 100644 --- a/hw/block/nvme.h +++ b/hw/block/nvme.h @@ -179,6 +179,7 @@ enum NvmeIoCommands { NVME_CMD_READ = 0x02, NVME_CMD_WRITE_UNCOR = 0x04, NVME_CMD_COMPARE = 0x05, + NVME_CMD_WRITE_ZEROS = 0x08, NVME_CMD_DSM = 0x09, };