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[66.111.4.228]) by smtp.gmail.com with ESMTPSA id x124sm3448976qkd.72.2020.09.01.20.01.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 01 Sep 2020 20:01:40 -0700 (PDT) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailauth.nyi.internal (Postfix) with ESMTP id D936227C005A; Tue, 1 Sep 2020 23:01:38 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Tue, 01 Sep 2020 23:01:38 -0400 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduiedrudefkedgieeiucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne goufhorhhtvggutfgvtghiphdvucdlgedtmdenucfjughrpefhvffufffkofgjfhgggfes tdekredtredttdenucfhrhhomhepuehoqhhunhcuhfgvnhhguceosghoqhhunhdrfhgvnh hgsehgmhgrihhlrdgtohhmqeenucggtffrrghtthgvrhhnpeehvdevteefgfeiudettdef vedvvdelkeejueffffelgeeuhffhjeetkeeiueeuleenucfkphephedvrdduheehrdduud durdejudenucevlhhushhtvghrufhiiigvpedutdenucfrrghrrghmpehmrghilhhfrhho mhepsghoqhhunhdomhgvshhmthhprghuthhhphgvrhhsohhnrghlihhthidqieelvdeghe dtieegqddujeejkeehheehvddqsghoqhhunhdrfhgvnhhgpeepghhmrghilhdrtghomhes fhhigihmvgdrnhgrmhgv X-ME-Proxy: Received: from localhost (unknown [52.155.111.71]) by mail.messagingengine.com (Postfix) with ESMTPA id 4CEAD3280065; Tue, 1 Sep 2020 23:01:38 -0400 (EDT) From: Boqun Feng To: linux-hyperv@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-scsi@vger.kernel.org Cc: "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Jiri Kosina , Benjamin Tissoires , Dmitry Torokhov , "David S. Miller" , Jakub Kicinski , "James E.J. Bottomley" , "Martin K. Petersen" , Michael Kelley , Boqun Feng Subject: [RFC v2 11/11] scsi: storvsc: Support PAGE_SIZE larger than 4K Date: Wed, 2 Sep 2020 11:01:07 +0800 Message-Id: <20200902030107.33380-12-boqun.feng@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200902030107.33380-1-boqun.feng@gmail.com> References: <20200902030107.33380-1-boqun.feng@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hyper-V always use 4k page size (HV_HYP_PAGE_SIZE), so when communicating with Hyper-V, a guest should always use HV_HYP_PAGE_SIZE as the unit for page related data. For storvsc, the data is vmbus_packet_mpb_array. And since in scsi_cmnd, sglist of pages (in unit of PAGE_SIZE) is used, we need convert pages in the sglist of scsi_cmnd into Hyper-V pages in vmbus_packet_mpb_array. This patch does the conversion by dividing pages in sglist into Hyper-V pages, offset and indexes in vmbus_packet_mpb_array are recalculated accordingly. Signed-off-by: Boqun Feng --- drivers/scsi/storvsc_drv.c | 60 ++++++++++++++++++++++++++++++++++---- 1 file changed, 54 insertions(+), 6 deletions(-) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 8f5f5dc863a4..3f6610717d4e 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -1739,23 +1739,71 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd) payload_sz = sizeof(cmd_request->mpb); if (sg_count) { - if (sg_count > MAX_PAGE_BUFFER_COUNT) { + unsigned int hvpg_idx = 0; + unsigned int j = 0; + unsigned long hvpg_offset = sgl->offset & ~HV_HYP_PAGE_MASK; + unsigned int hvpg_count = HVPFN_UP(hvpg_offset + length); - payload_sz = (sg_count * sizeof(u64) + + if (hvpg_count > MAX_PAGE_BUFFER_COUNT) { + + payload_sz = (hvpg_count * sizeof(u64) + sizeof(struct vmbus_packet_mpb_array)); payload = kzalloc(payload_sz, GFP_ATOMIC); if (!payload) return SCSI_MLQUEUE_DEVICE_BUSY; } + /* + * sgl is a list of PAGEs, and payload->range.pfn_array + * expects the page number in the unit of HV_HYP_PAGE_SIZE (the + * page size that Hyper-V uses, so here we need to divide PAGEs + * into HV_HYP_PAGE in case that PAGE_SIZE > HV_HYP_PAGE_SIZE. + */ payload->range.len = length; - payload->range.offset = sgl[0].offset; + payload->range.offset = sgl[0].offset & ~HV_HYP_PAGE_MASK; + hvpg_idx = sgl[0].offset >> HV_HYP_PAGE_SHIFT; cur_sgl = sgl; - for (i = 0; i < sg_count; i++) { - payload->range.pfn_array[i] = - page_to_pfn(sg_page((cur_sgl))); + for (i = 0, j = 0; i < sg_count; i++) { + /* + * "PAGE_SIZE / HV_HYP_PAGE_SIZE - hvpg_idx" is the # + * of HV_HYP_PAGEs in the current PAGE. + * + * "hvpg_count - j" is the # of unhandled HV_HYP_PAGEs. + * + * As shown in the following, the minimal of both is + * the # of HV_HYP_PAGEs, we need to handle in this + * PAGE. + * + * |------------------ PAGE ----------------------| + * | PAGE_SIZE / HV_HYP_PAGE_SIZE in total | + * |hvpg|hvpg| ... |hvpg|... |hvpg| + * ^ ^ + * hvpg_idx | + * ^ | + * +---(hvpg_count - j)--+ + * + * or + * + * |------------------ PAGE ----------------------| + * | PAGE_SIZE / HV_HYP_PAGE_SIZE in total | + * |hvpg|hvpg| ... |hvpg|... |hvpg| + * ^ ^ + * hvpg_idx | + * ^ | + * +---(hvpg_count - j)------------------------+ + */ + unsigned int nr_hvpg = min((unsigned int)(PAGE_SIZE / HV_HYP_PAGE_SIZE) - hvpg_idx, + hvpg_count - j); + unsigned int k; + + for (k = 0; k < nr_hvpg; k++) { + payload->range.pfn_array[j] = + page_to_hvpfn(sg_page((cur_sgl))) + hvpg_idx + k; + j++; + } cur_sgl = sg_next(cur_sgl); + hvpg_idx = 0; } } -- 2.28.0