From patchwork Tue Mar 14 04:46:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13173625 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 1D2C1C6FD1F for ; Tue, 14 Mar 2023 04:46:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229565AbjCNEqg (ORCPT ); Tue, 14 Mar 2023 00:46:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36750 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229473AbjCNEqf (ORCPT ); Tue, 14 Mar 2023 00:46:35 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1B435AB67 for ; Mon, 13 Mar 2023 21:46:33 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id y15-20020a17090aa40f00b00237ad8ee3a0so13928877pjp.2 for ; Mon, 13 Mar 2023 21:46:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1678769193; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=UasGxUvD/6g4IwIcOZQz9JmOw1F78bhUJX7l6AUhgEk=; b=ABdMLy0qDOTqhAEOBhgimyuNWzeR/Zq5TUIKYOS3Qg/oz1Q5nV6Cu5vjpZE7o0ErJE VygRD7tCfY+mb/m6T1HY1BV4iLZl17WK7INjQXz1vFJbAwPDgrH9mqIhXJEwovlPh817 v4KfnPuyqnKGTBW4VwbI2FAuYqWefezJqTn1wWm4bRXfQ4lmAl886AsC3YPdHUtQIOYD yNXAyIyd+J+NzElYfwRWL+RJSS0FC49fJqpUiGx4tpzBKxgZF35qh5dXw3tLtRwNFxqg t4NwwSppme77as7jki7UhJ4c4MFT3lpfWn688RVhVCHdN+EegQtAzgJ06V01dMBAtUxa E8zw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678769193; 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=UasGxUvD/6g4IwIcOZQz9JmOw1F78bhUJX7l6AUhgEk=; b=nPKBSSmgK2cPXKtHRnkjW8uodrG5VpjtIIj8m8xurVktY2kvaCZT5HlP1vCc1XtWtx lAaJRwFNGF4nAirHPXt8peDvp46BTqLSv67HWMPIEvNLwM8/v9RZzNO70vuGycsY6MTT dwmFF6feLnOHrYQPnuPzlbo6tjf1qP+CsgCUoREXlm4OA4fzmJudL1AZ+mDyuklCAq3Z 6LwJfmaJ6lYYBXXTdRndDY1YxOY7GGuLZYRqIJg8RRqhuUE9u1cLWi6ronF8Fjud3OGc EYqrvc+GsgZPULjTfLfUFiH9jso3JQHVLTD8rVSv7oAjSVMVtKg1n+l7rAEeICEdCi3b Qngg== X-Gm-Message-State: AO0yUKXI35aY3VNFDan/UoqeXY/wg90eJEW0Du/PPego6IqWwJ9ZcgTF rXqU/HSp9BWKsxiA6G6xMDEs X-Google-Smtp-Source: AK7set9w0z5ELRqjpIFXFvbpfdGQuGD93hmPVj3hFDC/IOl8akSJqOB1b6dOFR3oMdAMhNGpOXNm0Q== X-Received: by 2002:a17:902:c946:b0:19c:be03:d1ba with SMTP id i6-20020a170902c94600b0019cbe03d1bamr42635675pla.6.1678769193313; Mon, 13 Mar 2023 21:46:33 -0700 (PDT) Received: from localhost.localdomain ([117.217.177.49]) by smtp.gmail.com with ESMTPSA id lh13-20020a170903290d00b0019c2b1c4ad4sm690125plb.6.2023.03.13.21.46.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Mar 2023 21:46:32 -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 v3 0/7] Add support for MHI Endpoint function driver Date: Tue, 14 Mar 2023 10:16:16 +0530 Message-Id: <20230314044623.10254-1-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 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