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,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 8E013C46462 for ; Tue, 31 Jul 2018 06:37:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 41F4E208A6 for ; Tue, 31 Jul 2018 06:37:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 41F4E208A6 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 S1731845AbeGaIQU (ORCPT ); Tue, 31 Jul 2018 04:16:20 -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 S1726086AbeGaIQT (ORCPT ); Tue, 31 Jul 2018 04:16:19 -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 23:37:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,426,1526367600"; d="scan'208";a="61154215" Received: from twinkler-lnx.jer.intel.com ([10.12.91.48]) by orsmga008.jf.intel.com with ESMTP; 30 Jul 2018 23:37:34 -0700 From: Tomas Winkler To: Greg Kroah-Hartman Cc: Alexander Usyskin , linux-kernel@vger.kernel.org, Tomas Winkler Subject: [char-misc-next 08/12] mei: hw: add dma ring control block Date: Tue, 31 Jul 2018 09:35:40 +0300 Message-Id: <20180731063544.25540-9-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 DMA ring control block contains write and read indices for host and device circular buffers. Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin --- drivers/misc/mei/dma-ring.c | 21 +++++++++++++++++++++ drivers/misc/mei/hbm.c | 2 ++ drivers/misc/mei/hw.h | 23 +++++++++++++++++++++++ drivers/misc/mei/mei_dev.h | 1 + 4 files changed, 47 insertions(+) diff --git a/drivers/misc/mei/dma-ring.c b/drivers/misc/mei/dma-ring.c index 368012116196..70901319534e 100644 --- a/drivers/misc/mei/dma-ring.c +++ b/drivers/misc/mei/dma-ring.c @@ -101,3 +101,24 @@ bool mei_dma_ring_is_allocated(struct mei_device *dev) { return !!dev->dr_dscr[DMA_DSCR_HOST].vaddr; } + +static inline +struct hbm_dma_ring_ctrl *mei_dma_ring_ctrl(struct mei_device *dev) +{ + return (struct hbm_dma_ring_ctrl *)dev->dr_dscr[DMA_DSCR_CTRL].vaddr; +} + +/** + * mei_dma_ring_reset - reset the dma control block + * + * @dev: mei device + */ +void mei_dma_ring_reset(struct mei_device *dev) +{ + struct hbm_dma_ring_ctrl *ctrl = mei_dma_ring_ctrl(dev); + + if (!ctrl) + return; + + memset(ctrl, 0, sizeof(*ctrl)); +} diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c index a3cdffb9ef62..f15d44bda28e 100644 --- a/drivers/misc/mei/hbm.c +++ b/drivers/misc/mei/hbm.c @@ -324,6 +324,8 @@ static int mei_hbm_dma_setup_req(struct mei_device *dev) req.dma_dscr[i].size = dev->dr_dscr[i].size; } + mei_dma_ring_reset(dev); + ret = mei_hbm_write_message(dev, &mei_hdr, &req); if (ret) { dev_err(dev->dev, "dma setup request write failed: ret = %d.\n", diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h index 65655925791a..4f09bbcdbc2a 100644 --- a/drivers/misc/mei/hw.h +++ b/drivers/misc/mei/hw.h @@ -512,4 +512,27 @@ struct hbm_dma_setup_response { u8 reserved[2]; } __packed; +/** + * struct mei_dma_ring_ctrl - dma ring control block + * + * @hbuf_wr_idx: host circular buffer write index in slots + * @reserved1: reserved for alignment + * @hbuf_rd_idx: host circular buffer read index in slots + * @reserved2: reserved for alignment + * @dbuf_wr_idx: device circular buffer write index in slots + * @reserved3: reserved for alignment + * @dbuf_rd_idx: device circular buffer read index in slots + * @reserved4: reserved for alignment + */ +struct hbm_dma_ring_ctrl { + u32 hbuf_wr_idx; + u32 reserved1; + u32 hbuf_rd_idx; + u32 reserved2; + u32 dbuf_wr_idx; + u32 reserved3; + u32 dbuf_rd_idx; + u32 reserved4; +} __packed; + #endif diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h index a6796e3f712b..033b5eff8e59 100644 --- a/drivers/misc/mei/mei_dev.h +++ b/drivers/misc/mei/mei_dev.h @@ -597,6 +597,7 @@ void mei_cancel_work(struct mei_device *dev); int mei_dmam_ring_alloc(struct mei_device *dev); void mei_dmam_ring_free(struct mei_device *dev); bool mei_dma_ring_is_allocated(struct mei_device *dev); +void mei_dma_ring_reset(struct mei_device *dev); /* * MEI interrupt functions prototype -- 2.14.4