From patchwork Fri Oct 30 02:45:42 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hemant Kumar X-Patchwork-Id: 11868335 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DB94E14C0 for ; Fri, 30 Oct 2020 02:46:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0F5F2076E for ; Fri, 30 Oct 2020 02:46:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="F9uIUHVM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725988AbgJ3Cqp (ORCPT ); Thu, 29 Oct 2020 22:46:45 -0400 Received: from m42-4.mailgun.net ([69.72.42.4]:14046 "EHLO m42-4.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725797AbgJ3Cpy (ORCPT ); Thu, 29 Oct 2020 22:45:54 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1604025952; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=DjIy/M1qVglqhJmRWua7rTWYev1FJVXfRDdZWx655o4=; b=F9uIUHVMFeuZUtvMfAblCD3yEpMX1Jc9epZU3FACfgW72SsyITXDjnw4rC9Qbq+hQmyapf87 h5+RFfvXHKZMu3jCiW94WZr4tyUX8x1M5yAMm5lGUeE0wZ1ksanbjl85zKv3HxMM3NSS4sIs y310t8gVK/ZOq+aSPXYl7GANhpM= X-Mailgun-Sending-Ip: 69.72.42.4 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n01.prod.us-west-2.postgun.com with SMTP id 5f9b7e608335df1657971c61 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 30 Oct 2020 02:45:52 GMT Sender: hemantk=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 23180C433CB; Fri, 30 Oct 2020 02:45:52 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=ALL_TRUSTED,BAYES_00,SPF_FAIL autolearn=no autolearn_force=no version=3.4.0 Received: from codeaurora.org (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: hemantk) by smtp.codeaurora.org (Postfix) with ESMTPSA id 11F98C433C8; Fri, 30 Oct 2020 02:45:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 11F98C433C8 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=hemantk@codeaurora.org From: Hemant Kumar To: manivannan.sadhasivam@linaro.org, gregkh@linuxfoundation.org Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, jhugo@codeaurora.org, bbhatt@codeaurora.org, loic.poulain@linaro.org, netdev@vger.kernel.org, Hemant Kumar Subject: [PATCH v11 0/4] userspace MHI client interface driver Date: Thu, 29 Oct 2020 19:45:42 -0700 Message-Id: <1604025946-28288-1-git-send-email-hemantk@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This patch series adds support for UCI driver. UCI driver enables userspace clients to communicate to external MHI devices like modem and WLAN. UCI driver probe creates standard character device file nodes for userspace clients to perform open, read, write, poll and release file operations. These file operations call MHI core layer APIs to perform data transfer using MHI bus to communicate with MHI device. Patch is tested using arm64 based platform. V11: - Fixed review comments for UCI documentation by expanding TLAs and rewording some sentences. V10: - Replaced mutex_lock with mutex_lock_interruptible in read() and write() file ops call back. V9: - Renamed dl_lock to dl_pending _lock and pending list to dl_pending for clarity. - Used read lock to protect cur_buf. - Change transfer status check logic and only consider 0 and -EOVERFLOW as only success. - Added __int to module init function. - Print channel name instead of minor number upon successful probe. V8: - Fixed kernel test robot compilation error by changing %lu to %zu for size_t. - Replaced uci with UCI in Kconfig, commit text, and comments in driver code. - Fixed minor style related comments. V7: - Decoupled uci device and uci channel objects. uci device is associated with device file node. uci channel is associated with MHI channels. uci device refers to uci channel to perform MHI channel operations for device file operations like read() and write(). uci device increments its reference count for every open(). uci device calls mhi_uci_dev_start_chan() to start the MHI channel. uci channel object is tracking number of times MHI channel is referred. This allows to keep the MHI channel in start state until last release() is called. After that uci channel reference count goes to 0 and uci channel clean up is performed which stops the MHI channel. After the last call to release() if driver is removed uci reference count becomes 0 and uci object is cleaned up. - Use separate uci channel read and write lock to fine grain locking between reader and writer. - Use uci device lock to synchronize open, release and driver remove. - Optimize for downlink only or uplink only UCI device. V6: - Moved uci.c to mhi directory. - Updated Kconfig to add module information. - Updated Makefile to rename uci object file name as mhi_uci - Removed kref for open count V5: - Removed mhi_uci_drv structure. - Used idr instead of creating global list of uci devices. - Used kref instead of local ref counting for uci device and open count. - Removed unlikely macro. V4: - Fix locking to protect proper struct members. - Updated documentation describing uci client driver use cases. - Fixed uci ref counting in mhi_uci_open for error case. - Addressed style related review comments. V3: Added documentation for MHI UCI driver. V2: - Added mutex lock to prevent multiple readers to access same - mhi buffer which can result into use after free. Hemant Kumar (4): bus: mhi: core: Add helper API to return number of free TREs bus: mhi: core: Move MHI_MAX_MTU to external header file docs: Add documentation for userspace client interface bus: mhi: Add userspace client interface driver Documentation/mhi/index.rst | 1 + Documentation/mhi/uci.rst | 84 +++++ drivers/bus/mhi/Kconfig | 13 + drivers/bus/mhi/Makefile | 4 + drivers/bus/mhi/core/internal.h | 1 - drivers/bus/mhi/core/main.c | 12 + drivers/bus/mhi/uci.c | 662 ++++++++++++++++++++++++++++++++++++++++ include/linux/mhi.h | 12 + 8 files changed, 788 insertions(+), 1 deletion(-) create mode 100644 Documentation/mhi/uci.rst create mode 100644 drivers/bus/mhi/uci.c