From patchwork Thu May 30 22:45:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 800257 Received: from mail-pg1-f174.google.com (mail-pg1-f174.google.com [209.85.215.174]) (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 5E8874D8CF for ; Thu, 30 May 2024 22:46:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.174 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717109180; cv=none; b=p4ogdvyjlcviERYRLw0k2P08a5YiDXo08pICB5aEiemtEHNicn/IZXhkJ4avw156yu3F62YzvNYftGsIfghiCg8Bh69jK+3m2GWa3RyG5xcgdLVix51xDu1CUVXcfseI1rmX5stNN5A7iO1I2bd3PLQoXjRhmJ0qu5Nb6PNhrYM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717109180; c=relaxed/simple; bh=JSblW4xKQPWmCTufLZRebniB3Jpf5sbepE4eTR9OjBM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=as99BoecR4+/KltM1HZWCf4BBgaEIn7AqZi8+Y3KWzNt6rTpTSjAUjENRBwp5wH3LDE4m7jicUJUVEivMdsYaxBHm9vMYBJTPxyizkJ8nhF4fEwS8sRlxxcGe8MrW+1BF0VkzCPK8w3U9mVidxlp+AcmO3G4L+px6tYOI9HK69g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=UgNhswcj; arc=none smtp.client-ip=209.85.215.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="UgNhswcj" Received: by mail-pg1-f174.google.com with SMTP id 41be03b00d2f7-6bfd4b88637so1060197a12.1 for ; Thu, 30 May 2024 15:46:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1717109179; x=1717713979; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=pq4RWLiz1he3jfRd8xNC5uP0QIgGNhSaJwNREYP2LeM=; b=UgNhswcjsELnRyNBJ2rdtm4CDj1v3NkZCUyPqhZ03blFZuXBdoAtzLjAf0dB7JDVPt o76+uFmh7Ozu9I0MluOyyPVxe6WVkPN2qI+GaYvDEYjgbccITmZhG3noCe2GBTclUYrr 2I5N+uaLFUhYVAnY3RMXIM15Du2wmo6yZ5/6Q= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1717109179; x=1717713979; 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=pq4RWLiz1he3jfRd8xNC5uP0QIgGNhSaJwNREYP2LeM=; b=I8Jb98Gje+eaiSQhaLGQ2tsUi5Pnu/TuGfTyvRFgSXP5upBeSyzz3JKK0xmme97V1a 9lF856qyQTB1+IUGHzw2VJPgN+uoNkjpMRHgYD+BnN2eVr1TH00omCZPyK0maOywsZ6n 0/pXt7HHYVIRJJDPd8YBuWog82vU9goYlny1BLT1kHKHenYSAr86IrmvfY1dZ1Iug340 qH1EsZz1bVcPxw3A7gg45asKesEIxGyICXQQsbyOLF6xkq6vqmQQGhuQzgcrTObbmUTK lVftbeMhpLLn1NovMMcTMNY6nnKzOVdyQdc9pY2kTpYLNlXLvoOHUj6WjOZqka8H6i6Y pfew== X-Gm-Message-State: AOJu0Yxb8DEF9eTNCFHkTyEsgF64HB1LhzNzIuLUXr3YFk0mdD5z6lPS 293WpHkunYxr/24xz8pdBQOGRXUcQfPsmorUANMtlI5F8Ftja6pmYIW/YlqtDg== X-Google-Smtp-Source: AGHT+IF3nsfazT0Xha9zRO3J7BNzKwddTMzOcBVLAiQtQVBr1ihR/BaRoxVkTobTsMcgIx7QzjN6Bw== X-Received: by 2002:a17:903:2285:b0:1f6:2cd2:ab9d with SMTP id d9443c01a7336-1f6370b1254mr1389445ad.55.1717109178630; Thu, 30 May 2024 15:46:18 -0700 (PDT) Received: from dianders.sjc.corp.google.com ([2620:15c:9d:2:564b:72b6:4827:cf6a]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f632410b20sm2955795ad.273.2024.05.30.15.46.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 May 2024 15:46:18 -0700 (PDT) From: Douglas Anderson To: Greg Kroah-Hartman , Jiri Slaby Cc: linux-arm-msm@vger.kernel.org, John Ogness , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Tony Lindgren , Stephen Boyd , linux-serial@vger.kernel.org, Yicong Yang , Johan Hovold , linux-kernel@vger.kernel.org, Bjorn Andersson , Andy Shevchenko , Konrad Dybcio , Douglas Anderson , Rob Herring , Thomas Gleixner , Vijaya Krishna Nivarthi Subject: [PATCH v2 0/7] serial: qcom-geni: Overhaul TX handling to fix crashes/hangs Date: Thu, 30 May 2024 15:45:52 -0700 Message-ID: <20240530224603.730042-1-dianders@chromium.org> X-Mailer: git-send-email 2.45.1.288.g0e0cd299f1-goog Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 While trying to reproduce -EBUSY errors that our lab was getting in suspend/resume testing, I ended up finding a whole pile of problems with the Qualcomm GENI serial driver. I've posted a fix for the -EBUSY issue separately [1]. This series is fixing all of the Qualcomm GENI problems that I found. As far as I can tell most of the problems have been in the Qualcomm GENI serial driver since inception, but it can be noted that the behavior got worse with the new kfifo changes. Previously when the OS took data out of the circular queue we'd just spit stale data onto the serial port. Now we'll hard lockup. :-P I've tried to break this series up as much as possible to make it easier to understand but the final patch is still a lot of change at once. Hopefully it's OK. [1] https://lore.kernel.org/r/20240530084841.v2.1.I2395e66cf70c6e67d774c56943825c289b9c13e4@changeid Changes in v2: - soc: qcom: geni-se: Add GP_LENGTH/IRQ_EN_SET/IRQ_EN_CLEAR registers - serial: qcom-geni: Fix the timeout in qcom_geni_serial_poll_bit() - serial: qcom-geni: Fix arg types for qcom_geni_serial_poll_bit() - serial: qcom-geni: Introduce qcom_geni_serial_poll_bitfield() - serial: qcom-geni: Just set the watermark level once - Totally rework / rename patch to handle suspend while active xfer - serial: qcom-geni: Rework TX in FIFO mode to fix hangs/lockups Douglas Anderson (7): soc: qcom: geni-se: Add GP_LENGTH/IRQ_EN_SET/IRQ_EN_CLEAR registers serial: qcom-geni: Fix the timeout in qcom_geni_serial_poll_bit() serial: qcom-geni: Fix arg types for qcom_geni_serial_poll_bit() serial: qcom-geni: Introduce qcom_geni_serial_poll_bitfield() serial: qcom-geni: Just set the watermark level once serial: qcom-geni: Fix suspend while active UART xfer serial: qcom-geni: Rework TX in FIFO mode to fix hangs/lockups drivers/tty/serial/qcom_geni_serial.c | 316 ++++++++++++++++---------- include/linux/soc/qcom/geni-se.h | 6 + 2 files changed, 203 insertions(+), 119 deletions(-)