From patchwork Thu Mar 14 15:23:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 1912173 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=W4qgswV0; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2604:1380:4601:e00::3; helo=am.mirrors.kernel.org; envelope-from=linux-pci+bounces-4831-incoming=patchwork.ozlabs.org@vger.kernel.org; receiver=patchwork.ozlabs.org) Received: from am.mirrors.kernel.org (am.mirrors.kernel.org [IPv6:2604:1380:4601:e00::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4TwWSf3ThYz1yWt for ; Fri, 15 Mar 2024 02:26:42 +1100 (AEDT) Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id 3A4F81F23157 for ; Thu, 14 Mar 2024 15:26:39 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 42ABD73171; Thu, 14 Mar 2024 15:24:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="W4qgswV0" X-Original-To: linux-pci@vger.kernel.org Received: from mail-pf1-f172.google.com (mail-pf1-f172.google.com [209.85.210.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5E2FD74C0D for ; Thu, 14 Mar 2024 15:24:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710429890; cv=none; b=bnENQBnm4BvuD6myFUmk1uEHugINqfeXamtKrzkBba/33kbkKBkWG/DMRYiUrpaP9qXQARks54OXh/h/kEGqrJUMA7NXQElqGYBwEpsnrQVk9UZ7LeZp5z5QA3fHNXFIV658olGvA/KeqrJY3fz+3FnpV8wvgZndGDQFnDkQA0c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710429890; c=relaxed/simple; bh=u+T142/W4OHi4TrqZYDBdEbmgdn1PJvXBdMP9ceIo3U=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=tpeHEUD9xr4vcUHgT5WiIPIw/tJhVGFcDjxKRXfG9oS1Ob9mV7L1+Ik6HY8sWDNchK4J+9ictGPs4/SJsLBbYMkuOtEucNRWV8GEY8W3OZCXGgNcA8I2nvR9XpN4w3GrAh7fcU1CMoo6H4I0rIZ2puIZvBBMcfc2GtzcZvqDB28= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=W4qgswV0; arc=none smtp.client-ip=209.85.210.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Received: by mail-pf1-f172.google.com with SMTP id d2e1a72fcca58-6e6ac741ff7so1210859b3a.0 for ; Thu, 14 Mar 2024 08:24:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1710429887; x=1711034687; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=UesLzv/s5weNz/WtSlaUPJ3gprn2+do0z55ESIdTIKs=; b=W4qgswV0m46zQ0JIFzAw7ojNW1QPG9H0DAU/QWiQjzZEH4r+NwaGK2kJUfIwoty0Ot NIvQ/c5B994zsP+8knTyVcRdYN/jsSOAaTd4PmmuvB5svkI5usXh+UeoZx1iRuSrsJqv W/y5VfJgQ/AimlvTxOQBu5k7/6tTZ9+7IuegVAPioNeLU1hgteo/9TXl80ys1LkQw0kx ZORoVdH3ddQLaCE1KmpfCgfYzekdFeVIKjkBeV/rOWJdUlTKD/FzGiT7E5QPzO1xZQRw D9Pwkp0EQsUS7jKsDSA03BUY/ZLmuKO3bciwE5/bpzldv1oRCo5vFQeoFuZTwh8cuxeV M5pA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710429887; x=1711034687; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=UesLzv/s5weNz/WtSlaUPJ3gprn2+do0z55ESIdTIKs=; b=Ny2nH/dppFuMB3xphaC9ytXN2fwerkSn8ET8U/s+IrLVpZFcE67lhb79996X0HFbFx V7xdv3hOW7uDUrGhyTEbfvrCELaiwBhParBzPOVNuVVI/QV8kiQMlwemYiask0kk6JlG HYNoOgONeAo8L6E5kEvqxJbYoioHtY4EBmpKHpZHhTik+6Kddn7Q/xbTZI50OTXTG/l8 GsTucB8iOtvfmLmRue819vRPeGELuyc+bdV0wrUMgK2Kxq7aqIgXisICXyaCaaGlDWve s9tAW6UsmW9yZLGXp+9S1qkN/AKLe5qIRxiwkHHlsVZpUQijPRabkBfCACzWpeknVv8h pPLA== X-Gm-Message-State: AOJu0YwsGdgEYrxYkCKHqf26g8g3qOC8iFYSePK2SqUemQOVmqZtm4Ci Sz8sHZn8LAJAFTOeUBfJyPEdZ3/8z/fXkY18x2CFax25BRELEEuhvKRqWPlHzw== X-Google-Smtp-Source: AGHT+IHQG5KLhzzNsvAOkfN5kVkEw1s96R6Mf6b+5IIQ0GHj3IiEjO1mYEkAkdOoQ49n+BrtdM4wyQ== X-Received: by 2002:a05:6a20:12c6:b0:1a2:b33b:d6e0 with SMTP id v6-20020a056a2012c600b001a2b33bd6e0mr2571998pzg.59.1710429886716; Thu, 14 Mar 2024 08:24:46 -0700 (PDT) Received: from [127.0.1.1] ([117.207.30.211]) by smtp.gmail.com with ESMTPSA id m4-20020a63ed44000000b005e438ea2a5asm824021pgk.53.2024.03.14.08.24.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Mar 2024 08:24:46 -0700 (PDT) From: Manivannan Sadhasivam Date: Thu, 14 Mar 2024 20:53:48 +0530 Subject: [PATCH 09/11] PCI: epf-test: Handle Link Down event Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240314-pci-epf-rework-v1-9-6134e6c1d491@linaro.org> References: <20240314-pci-epf-rework-v1-0-6134e6c1d491@linaro.org> In-Reply-To: <20240314-pci-epf-rework-v1-0-6134e6c1d491@linaro.org> To: Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Kishon Vijay Abraham I , Thierry Reding , Jonathan Hunter , Jingoo Han , Gustavo Pimentel Cc: linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, mhi@lists.linux.dev, linux-tegra@vger.kernel.org, Manivannan Sadhasivam X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=1993; i=manivannan.sadhasivam@linaro.org; h=from:subject:message-id; bh=u+T142/W4OHi4TrqZYDBdEbmgdn1PJvXBdMP9ceIo3U=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBl8xaQb8VpKIpIa5FQmaHW85so3xvUG3jdu7yO8 MV8jLLZotiJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCZfMWkAAKCRBVnxHm/pHO 9TcBB/wKPBWo7Z51yH6ZMP9ARLDl+xRfSnVueOjzfuJQU0rRD2off8VJhbSCOcELFIW+cCMat90 Cnnu+PXjUtf0C/vXmThEaxNslVw045iRcOydgzgWH6cp8O3ZjC0PLUqbb2LcKyKxVnpTz9pe0Ib HykZ0yCgCQ7SSSzadoqKAqObqh2npoW0NeGs2Aj6PmGyNFeftCYzZ28PWINMmpL6AOH+WvkmD9/ EdA79wTgjUDtsP5CG6WTf7l1G2oHngiWl9h7VcklbivUtoDbIoNqyy2uGelrkaW9NqhLpJfEEwX sZ8utoKYhryD+T0QQ1XEqVWTpIxdQm/kbSsabKO99Vos92Li X-Developer-Key: i=manivannan.sadhasivam@linaro.org; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 As per the PCIe base spec r5.0, section 5.2, Link Down event can happen under any of the following circumstances: 1. Fundamental/Hot reset 2. Link disable transmission by upstream component 3. Moving from L2/L3 to L0 When the event happens, the EPC driver capable of detecting it may pass the notification to the EPF driver through link_down() callback in 'struct pci_epc_bus_event_ops'. While the PCIe spec has not defined the actual behavior of the endpoint when the Link Down event happens, we may assume that atleast the ongoing transactions need to be stopped as the link won't be active. So let's cancel the command handler work in the callback implementation pci_epf_test_link_down(). The work will be started again in pci_epf_test_link_up() once the link comes back again. Signed-off-by: Manivannan Sadhasivam Reviewed-by: Niklas Cassel --- drivers/pci/endpoint/functions/pci-epf-test.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 84cd47ebac22..97245228c9eb 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -823,6 +823,15 @@ static int pci_epf_test_link_up(struct pci_epf *epf) return 0; } +static int pci_epf_test_link_down(struct pci_epf *epf) +{ + struct pci_epf_test *epf_test = epf_get_drvdata(epf); + + cancel_delayed_work(&epf_test->cmd_handler); + + return 0; +} + static const struct pci_epc_event_ops pci_epf_test_epc_event_ops = { .init = pci_epf_test_epc_init, .deinit = pci_epf_test_epc_deinit, @@ -830,6 +839,7 @@ static const struct pci_epc_event_ops pci_epf_test_epc_event_ops = { static const struct pci_epc_bus_event_ops pci_epf_test_bus_event_ops = { .link_up = pci_epf_test_link_up, + .link_down = pci_epf_test_link_down, }; static int pci_epf_test_alloc_space(struct pci_epf *epf)