From patchwork Thu Jun 1 14:57:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 13263939 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 70D9BC7EE2A for ; Thu, 1 Jun 2023 14:57:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234149AbjFAO5j (ORCPT ); Thu, 1 Jun 2023 10:57:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233975AbjFAO5i (ORCPT ); Thu, 1 Jun 2023 10:57:38 -0400 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3AFAF18C for ; Thu, 1 Jun 2023 07:57:37 -0700 (PDT) Received: by mail-pg1-x52a.google.com with SMTP id 41be03b00d2f7-5304d0d1eddso365839a12.2 for ; Thu, 01 Jun 2023 07:57:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1685631456; x=1688223456; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=rmnvesiHm2PCRYYtqBcPxBFWmAHluzsL+dqvf9/FLR0=; b=TNhODOFe3VPpymqxm+ucXF7xfwzIVA6pOK2an6amjX7VFTE7lTOrDmS2K0/q8Wksmk gXvwWEAodZkrt7tASZY40Tb2IaMjMuc265O+eDLDT+Aoppkv7yi26HO1A6NsMhu1h049 PzHiojGO/toLGLVlKyXCZaXtbUxUrNXs5PCpkNFh5fvazx3urVm65Lw9Xo2sRFbX2eKp 11rQh0qvgPLDiGNmwM4TR3NrOSJmeBMeRyheCQvGte0P1kPdXxIUnR5EjsmB8tV+h/Vh 70LcRWie4DKZ22SDG3TaGwfwaYjopTs7JDDu6NStyp83Y5I3GvlWgB+Yqr43SZFgVYyO hauw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685631456; x=1688223456; 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=rmnvesiHm2PCRYYtqBcPxBFWmAHluzsL+dqvf9/FLR0=; b=kVZ5ZQY6/yBwKAPlEhn8m2hbrgz2rVODfj4osF2koXSe5Z0QvB5T2NEb/9NyPa7YiZ DqFTyGh9L9pAk9Lce56yhu7pOhdnzrDaIgoPllAx1ZDTvEomrTLzAxIagXG6+z7LEn14 SD9Vp741AYrw0Bf91gqpq19z8W2R9uzh/ad8lywO2R7lyMf93+bWyJoNhLsScELAOaYc E6r1spRUf3xeUbgezjwVG1Z+rX64EWGMV1C8kBeUbrROR4hke15h8j600S1ClztmXupr DGEbSndywLi3cWSl2UmOfQOqswixT5aYlurJIPclTq771ZRhvzZK3Ysku/t1bZudvf2t dGkQ== X-Gm-Message-State: AC+VfDw1uyppPgpGIXvKvdjc4N+026CZv1RWGvVpq5xlUV7l0hMq/NIh 6FcXVIGfY3mLA7wU1kPWG2ha X-Google-Smtp-Source: ACHHUZ7/dnL69tsFA7uB9Tx68drmjDhTy9/bpwpA9IGEOCy4MaKUApeF6G/EOFIJAPKK4yx3GvNwqQ== X-Received: by 2002:a17:902:e886:b0:1b1:84c5:8abf with SMTP id w6-20020a170902e88600b001b184c58abfmr2798729plg.49.1685631456620; Thu, 01 Jun 2023 07:57:36 -0700 (PDT) Received: from localhost.localdomain ([117.217.186.123]) by smtp.gmail.com with ESMTPSA id o17-20020a170902d4d100b001b0603829a0sm3577826plg.199.2023.06.01.07.57.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Jun 2023 07:57:36 -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 v5 0/9] Add support for MHI Endpoint function driver Date: Thu, 1 Jun 2023 20:27:09 +0530 Message-Id: <20230601145718.12204-1-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 v5: * Moved the PCI EPF driver match logic to pci_epf_match_id() function and used that to get the matched driver ID for passing to driver probe instead of storing the id during match. * Added a patch to fix the missing documentation about MSI/MSI-X start vector. * Addressed the review comments on the MHI EPF driver. Most notably, got rid of local variable for tracking MHI registration and used the mhi_dev pointer. Also, modified the MSI vector increment comment to make it clear. * Added a patch for adding MHI EPF driver to MAINTAINERS file 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 (9): MAINTAINERS: Add entry for MHI networking drivers under MHI bus PCI: endpoint: Add missing documentation about the MSI/MSI-X range 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 MAINTAINERS | 1 + 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 | 462 ++++++++++++++++++ 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 | 56 ++- drivers/pci/endpoint/pci-epf-core.c | 20 +- include/linux/pci-epc.h | 2 + include/linux/pci-epf.h | 8 +- 13 files changed, 559 insertions(+), 13 deletions(-) create mode 100644 drivers/pci/endpoint/functions/pci-epf-mhi.c