From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CBDD8C46463 for ; Tue, 31 Jul 2018 06:37:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 90658208A3 for ; Tue, 31 Jul 2018 06:37:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90658208A3 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729784AbeGaIQJ (ORCPT ); Tue, 31 Jul 2018 04:16:09 -0400 Received: from mga09.intel.com ([134.134.136.24]:59929 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726086AbeGaIQI (ORCPT ); Tue, 31 Jul 2018 04:16:08 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 30 Jul 2018 23:37:25 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,426,1526367600"; d="scan'208";a="61154173" Received: from twinkler-lnx.jer.intel.com ([10.12.91.48]) by orsmga008.jf.intel.com with ESMTP; 30 Jul 2018 23:37:23 -0700 From: Tomas Winkler To: Greg Kroah-Hartman Cc: Alexander Usyskin , linux-kernel@vger.kernel.org, Tomas Winkler Subject: [char-misc-next 02/12] mei: hbm: define dma ring setup protocol Date: Tue, 31 Jul 2018 09:35:34 +0300 Message-Id: <20180731063544.25540-3-tomas.winkler@intel.com> X-Mailer: git-send-email 2.14.4 In-Reply-To: <20180731063544.25540-1-tomas.winkler@intel.com> References: <20180731063544.25540-1-tomas.winkler@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The protocol defines how to setup an I/O ring on top of host memory to utilize the device DMA engine for faster transport. Three memory buffers are allocated. A Host circular buffer for from the Host to Device communication. A Device circular buffer for from Device to the Host communication. And finally a Control block where the pointers for the both circular buffers are managed. Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin --- drivers/misc/mei/hw.h | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h index 3b325d955fbe..76fb502e6f71 100644 --- a/drivers/misc/mei/hw.h +++ b/drivers/misc/mei/hw.h @@ -122,6 +122,9 @@ #define MEI_HBM_NOTIFY_RES_CMD 0x90 #define MEI_HBM_NOTIFICATION_CMD 0x11 +#define MEI_HBM_DMA_SETUP_REQ_CMD 0x12 +#define MEI_HBM_DMA_SETUP_RES_CMD 0x92 + /* * MEI Stop Reason * used by hbm_host_stop_request.reason @@ -449,4 +452,50 @@ struct hbm_notification { u8 reserved[1]; } __packed; +/** + * struct hbm_dma_mem_dscr - dma ring + * + * @addr_hi: the high 32bits of 64 bit address + * @addr_lo: the low 32bits of 64 bit address + * @size : size in bytes (must be power of 2) + */ +struct hbm_dma_mem_dscr { + u32 addr_hi; + u32 addr_lo; + u32 size; +} __packed; + +enum { + DMA_DSCR_HOST = 0, + DMA_DSCR_DEVICE = 1, + DMA_DSCR_CTRL = 2, + DMA_DSCR_NUM, +}; + +/** + * struct hbm_dma_setup_request - dma setup request + * + * @hbm_cmd: bus message command header + * @reserved: reserved for alignment + * @dma_dscr: dma descriptor for HOST, DEVICE, and CTRL + */ +struct hbm_dma_setup_request { + u8 hbm_cmd; + u8 reserved[3]; + struct hbm_dma_mem_dscr dma_dscr[DMA_DSCR_NUM]; +} __packed; + +/** + * struct hbm_dma_setup_response - dma setup response + * + * @hbm_cmd: bus message command header + * @status: 0 on success; otherwise DMA setup failed. + * @reserved: reserved for alignment + */ +struct hbm_dma_setup_response { + u8 hbm_cmd; + u8 status; + u8 reserved[2]; +} __packed; + #endif -- 2.14.4