From patchwork Fri May 19 14:42:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13248428 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C9B13C77B75 for ; Fri, 19 May 2023 14:42:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232163AbjESOm0 (ORCPT ); Fri, 19 May 2023 10:42:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59294 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232165AbjESOmY (ORCPT ); Fri, 19 May 2023 10:42:24 -0400 Received: from mail-pf1-x42c.google.com (mail-pf1-x42c.google.com [IPv6:2607:f8b0:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 12F361A6 for ; Fri, 19 May 2023 07:42:23 -0700 (PDT) Received: by mail-pf1-x42c.google.com with SMTP id d2e1a72fcca58-64d41763796so80109b3a.2 for ; Fri, 19 May 2023 07:42:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1684507342; x=1687099342; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=QxW2dC8DpIB+E4FM2rEwoLKWijA29j1mc0pHII1lmCA=; b=thHAa7CchoE1NLBuAq+oeQzOJwWOma12Pim3N47UBdIaWaxLX0R8ZQdMC6WKOV4jyo 5JcCgklVz4JxqY6af2ID56MeyN7O9H3dCXsArvauQRqbFxGLPnqmlGwGJ8TVuE8G/Ck6 +2Ed4edM4bSeBczjrRlV93bLQiU5LkT7AqTyu7XDVMjYuxmuHY2jaO7mJ4PnPdggMT9X VuZmPrDv3eriUV4a1kw+H8wTGdIqjaUd0m+VlvEIwHxbUFCRJ1/bGoOmRpMya9Fhz7rV LuJSbDhuWoGR6ysqDmJg/kHoiNDBy8sratCyNiLsnepVOYDa6UBOP4tzMHWUPU10SqhP UR7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1684507342; x=1687099342; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=QxW2dC8DpIB+E4FM2rEwoLKWijA29j1mc0pHII1lmCA=; b=L1SrqRIZJTqwnG31yF+TNVvC9Chw/17m9ySJqfZ33Cfq89F5RtH8HUtEeZ+akiWcJg vvN/jeJLMXx9dbT/ERToG7TS1/4kG/OwGfmJRIuDcYJt6qhJ6KmjzucE0nO/duUiwo4E Em6qHIWmfMT9eb2CAaeldYDX8Xx9H8imAv2v3CUV20hoWhoE4Kygrjo8pQjmKVLhnxcL 09SV9n96ToDU5SNDo+HOZciBSVWVz8+8lIPBr58FKz0zoDIZdQ2HuqgF9BCLP0HSm+8g mPPtgiic3Tf5xNSuSZ4G3lLyevWqjoeQ70Atf+3NOyV4+Wj4re0ticv2qz4l27Gpq7TB Rviw== X-Gm-Message-State: AC+VfDxJn4rz48MSATqxkLjbprQ3a3ebNwBexhpvAutsb+SiktYLkHI7 0JGQXVtrjU91iG+wpXPRMbmX X-Google-Smtp-Source: ACHHUZ7gLvpq5YXfYHPI4+dpDWfbf0UV4FW4SIGLJ9Cv15xtMezdH2Gy5DqP+Zy28ziYouuXLP/Pdg== X-Received: by 2002:a05:6a00:845:b0:64a:f730:154c with SMTP id q5-20020a056a00084500b0064af730154cmr3577224pfk.13.1684507342475; Fri, 19 May 2023 07:42:22 -0700 (PDT) Received: from localhost.localdomain ([117.202.184.13]) by smtp.gmail.com with ESMTPSA id v11-20020aa7808b000000b005d22639b577sm3089611pff.165.2023.05.19.07.42.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 May 2023 07:42:22 -0700 (PDT) From: Manivannan Sadhasivam To: lpieralisi@kernel.org, kw@linux.com Cc: kishon@kernel.org, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH v4 0/7] Add support for MHI Endpoint function driver Date: Fri, 19 May 2023 20:12:08 +0530 Message-Id: <20230519144215.25167-1-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Hello, This series adds support for Modem Host Interface (MHI) Endpoint function driver and few updates to the PCI endpoint core. MHI === MHI is the communication protocol used by the host machines to control and communicate with the Qualcomm modems/WLAN devices over any high speed physical bus like PCIe. In Linux kernel, MHI is modeled as a bus driver [1] and there are two instances of MHI used in a typical setup. 1. MHI host - MHI implementation for the host machines like x86/ARM64. 2. MHI Endpoint - MHI implementation for the endpoint devices like modems. MHI EPF ======= The MHI Endpoint function driver (MHI EPF) is used on the MHI endpoint devices like modems. The MHI EPF driver sits in between the PCIe EP and MHI EP bus and carries out all of the PCIe related activities like BAR config, PCIe Event handling, MMIO read/write etc,... for the MHI EP bus. Below is the simple representation of the setup: +----------------------------------------------------+ | Endpoint CPU | | | +------------+ | +------------+ +-----------+ +-----------+ | | | | | | | | | | | | | | | MHI EP | | | | | | PCIe Bus | Modem DSP +---+---+ Bus +---+ MHI EPF +---+ PCIe EP +---+--------- | | | | | | | | | | | | | | | | | | | | +------------+ | +------------+ +-----------+ +-----------+ | | | | | +----------------------------------------------------+ The data packets will be read from the Modem DSP by the MHI stack and will be transmitted to the host machine over PCIe bus with the help of MHI EPF driver. Test setup ========== This series has been tested on Snapdragon X55 modem a.k.a SDX55 connected to the ARM64 host machine. Thanks, Mani [1] https://www.kernel.org/doc/html/latest/mhi/mhi.html Changes in v4: * Collected review tag from Kishon * Changed the IP_SW0 channel numbers as per latest MHI spec Changes in v3: * Fixed the probe function of EPF_VNTB driver Changes in v2: * Rebased on top of v6.3-rc1 * Switched to the new callback interface for passing events from EPC to EPF * Dropped one patch related to notifier Manivannan Sadhasivam (7): PCI: endpoint: Pass EPF device ID to the probe function PCI: endpoint: Warn and return if EPC is started/stopped multiple times PCI: endpoint: Add linkdown notifier support PCI: endpoint: Add BME notifier support PCI: qcom-ep: Add support for Link down notification PCI: qcom-ep: Add support for BME notification PCI: endpoint: Add PCI Endpoint function driver for MHI bus drivers/pci/controller/dwc/pcie-qcom-ep.c | 2 + drivers/pci/endpoint/functions/Kconfig | 10 + drivers/pci/endpoint/functions/Makefile | 1 + drivers/pci/endpoint/functions/pci-epf-mhi.c | 454 ++++++++++++++++++ drivers/pci/endpoint/functions/pci-epf-ntb.c | 3 +- drivers/pci/endpoint/functions/pci-epf-test.c | 2 +- drivers/pci/endpoint/functions/pci-epf-vntb.c | 2 +- drivers/pci/endpoint/pci-ep-cfs.c | 3 + drivers/pci/endpoint/pci-epc-core.c | 52 ++ drivers/pci/endpoint/pci-epf-core.c | 8 +- include/linux/pci-epc.h | 2 + include/linux/pci-epf.h | 8 +- 12 files changed, 540 insertions(+), 7 deletions(-) create mode 100644 drivers/pci/endpoint/functions/pci-epf-mhi.c