From patchwork Tue Feb 22 10:48:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Usyskin, Alexander" X-Patchwork-Id: 12754896 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 79C90C433EF for ; Tue, 22 Feb 2022 10:49:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C392B10E6FE; Tue, 22 Feb 2022 10:49:41 +0000 (UTC) Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3BD0910E6FE for ; Tue, 22 Feb 2022 10:49:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1645526980; x=1677062980; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bW55UyO6RrO41FoDI/HbCEJhZQXgJNuHKflVL4Fib78=; b=Ok7CB16CwpU/p7NwRBTa17BAy1hCBohsWCxjKV9xAywDZxq53qnyclnH ZSTbbOuPXbiEd7sOtkHTT15LoUvcqkGpS2RDggUaLhF6qBdErIXEYBbm1 9533o92IcbJxm26R4t6R4OXiJA2p6QfV9e4JnWo/jpjszw8XXqdAoElDI vE+Us6pNKiptExHhVBJigo4CPkgACS0vbS3BATG3z/PQVjysBDtQ/gyox CwvadS+1nei0saMtZ82vWit93KChYWzKPvQutD/v6/bt8JWPKq6PxmQn+ 5SiCMDAN8Y47LBqb5obiw8FTCR8+CjO1Yq4E13f4yDr+uQLHN7pTWs67s A==; X-IronPort-AV: E=McAfee;i="6200,9189,10265"; a="312405422" X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="312405422" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 02:49:40 -0800 X-IronPort-AV: E=Sophos;i="5.88,387,1635231600"; d="scan'208";a="706569617" Received: from sannilnx.jer.intel.com ([10.12.231.79]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Feb 2022 02:49:36 -0800 From: Alexander Usyskin To: Greg Kroah-Hartman , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , David Airlie , Daniel Vetter , Tvrtko Ursulin Date: Tue, 22 Feb 2022 12:48:52 +0200 Message-Id: <20220222104854.3188643-6-alexander.usyskin@intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220222104854.3188643-1-alexander.usyskin@intel.com> References: <20220222104854.3188643-1-alexander.usyskin@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 5/7] mei: gsc: use polling instead of interrupts X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx@lists.freedesktop.org, Alexander Usyskin , linux-kernel@vger.kernel.org, Tomas Winkler , Vitaly Lubart Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Tomas Winkler A work-around for a HW issue in XEHPSDV that manifests itself when SW reads a gsc register when gsc is sending an interrupt. The work-around is to disable interrupts and to use polling instead. Cc: James Ausmus Signed-off-by: Vitaly Lubart Signed-off-by: Tomas Winkler --- drivers/misc/mei/gsc-me.c | 42 +++++++++++++++++++++++----- drivers/misc/mei/hw-me.c | 58 ++++++++++++++++++++++++++++++++++++--- drivers/misc/mei/hw-me.h | 12 ++++++++ 3 files changed, 101 insertions(+), 11 deletions(-) diff --git a/drivers/misc/mei/gsc-me.c b/drivers/misc/mei/gsc-me.c index dac482ddab51..ffe9bf980f92 100644 --- a/drivers/misc/mei/gsc-me.c +++ b/drivers/misc/mei/gsc-me.c @@ -13,6 +13,7 @@ #include #include #include +#include #include "mei_dev.h" #include "hw-me.h" @@ -66,13 +67,27 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev, dev_set_drvdata(&aux_dev->dev, dev); - ret = devm_request_threaded_irq(device, hw->irq, - mei_me_irq_quick_handler, - mei_me_irq_thread_handler, - IRQF_ONESHOT, KBUILD_MODNAME, dev); - if (ret) { - dev_err(device, "irq register failed %d\n", ret); - goto err; + /* use polling */ + if (mei_me_hw_use_polling(hw)) { + mei_disable_interrupts(dev); + init_waitqueue_head(&hw->wait_active); + hw->is_active = true; /* start in active mode for initialization */ + hw->polling_thread = kthread_run(mei_me_polling_thread, dev, + "kmegscirqd/%s", dev_name(device)); + if (IS_ERR(hw->polling_thread)) { + ret = PTR_ERR(hw->polling_thread); + dev_err(device, "unable to create kernel thread: %d\n", ret); + goto err; + } + } else { + ret = devm_request_threaded_irq(device, hw->irq, + mei_me_irq_quick_handler, + mei_me_irq_thread_handler, + IRQF_ONESHOT, KBUILD_MODNAME, dev); + if (ret) { + dev_err(device, "irq register failed %d\n", ret); + goto err; + } } pm_runtime_get_noresume(device); @@ -108,6 +123,7 @@ static int mei_gsc_probe(struct auxiliary_device *aux_dev, static void mei_gsc_remove(struct auxiliary_device *aux_dev) { struct mei_device *dev; + struct mei_me_hw *hw; dev = dev_get_drvdata(&aux_dev->dev); if (!dev) @@ -115,6 +131,10 @@ static void mei_gsc_remove(struct auxiliary_device *aux_dev) mei_stop(dev); + hw = to_me_hw(dev); + if (mei_me_hw_use_polling(hw)) + kthread_stop(hw->polling_thread); + mei_deregister(dev); pm_runtime_disable(&aux_dev->dev); @@ -178,6 +198,9 @@ static int __maybe_unused mei_gsc_pm_runtime_suspend(struct device *device) if (mei_write_is_idle(dev)) { hw = to_me_hw(dev); hw->pg_state = MEI_PG_ON; + + if (mei_me_hw_use_polling(hw)) + hw->is_active = false; ret = 0; } else { ret = -EAGAIN; @@ -202,6 +225,11 @@ static int __maybe_unused mei_gsc_pm_runtime_resume(struct device *device) hw = to_me_hw(dev); hw->pg_state = MEI_PG_OFF; + if (mei_me_hw_use_polling(hw)) { + hw->is_active = true; + wake_up(&hw->wait_active); + } + mutex_unlock(&dev->device_lock); irq_ret = mei_me_irq_thread_handler(1, dev); diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 7e77328142ff..1eaba035cb2a 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -10,6 +10,7 @@ #include #include #include +#include #include "mei_dev.h" #include "hbm.h" @@ -327,9 +328,12 @@ static void mei_me_intr_clear(struct mei_device *dev) */ static void mei_me_intr_enable(struct mei_device *dev) { - u32 hcsr = mei_hcsr_read(dev); + u32 hcsr; + + if (mei_me_hw_use_polling(to_me_hw(dev))) + return; - hcsr |= H_CSR_IE_MASK; + hcsr = mei_hcsr_read(dev) | H_CSR_IE_MASK; mei_hcsr_set(dev, hcsr); } @@ -354,6 +358,9 @@ static void mei_me_synchronize_irq(struct mei_device *dev) { struct mei_me_hw *hw = to_me_hw(dev); + if (mei_me_hw_use_polling(hw)) + return; + synchronize_irq(hw->irq); } @@ -380,7 +387,10 @@ static void mei_me_host_set_ready(struct mei_device *dev) { u32 hcsr = mei_hcsr_read(dev); - hcsr |= H_CSR_IE_MASK | H_IG | H_RDY; + if (!mei_me_hw_use_polling(to_me_hw(dev))) + hcsr |= H_CSR_IE_MASK; + + hcsr |= H_IG | H_RDY; mei_hcsr_set(dev, hcsr); } @@ -1174,7 +1184,7 @@ static int mei_me_hw_reset(struct mei_device *dev, bool intr_enable) hcsr |= H_RST | H_IG | H_CSR_IS_MASK; - if (!intr_enable) + if (!intr_enable || mei_me_hw_use_polling(to_me_hw(dev))) hcsr &= ~H_CSR_IE_MASK; dev->recvd_hw_ready = false; @@ -1323,6 +1333,46 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id) } EXPORT_SYMBOL_GPL(mei_me_irq_thread_handler); +#define MEI_POLLING_TIMEOUT_ACTIVE 100 +#define MEI_POLLING_TIMEOUT_IDLE 500 + +int mei_me_polling_thread(void *_dev) +{ + struct mei_device *dev = _dev; + irqreturn_t irq_ret; + long polling_timeout = MEI_POLLING_TIMEOUT_ACTIVE; + + dev_dbg(dev->dev, "kernel thread is running\n"); + while (!kthread_should_stop()) { + struct mei_me_hw *hw = to_me_hw(dev); + u32 hcsr; + + wait_event_timeout(hw->wait_active, + hw->is_active || kthread_should_stop(), + msecs_to_jiffies(MEI_POLLING_TIMEOUT_IDLE)); + + if (kthread_should_stop()) + break; + + hcsr = mei_hcsr_read(dev); + if (me_intr_src(hcsr)) { + polling_timeout = MEI_POLLING_TIMEOUT_ACTIVE; + irq_ret = mei_me_irq_thread_handler(1, dev); + if (irq_ret != IRQ_HANDLED) + dev_err(dev->dev, "irq_ret %d\n", irq_ret); + } else { + polling_timeout = clamp_val(polling_timeout + MEI_POLLING_TIMEOUT_ACTIVE, + MEI_POLLING_TIMEOUT_ACTIVE, + MEI_POLLING_TIMEOUT_IDLE); + } + + schedule_timeout_interruptible(msecs_to_jiffies(polling_timeout)); + } + + return 0; +} +EXPORT_SYMBOL_GPL(mei_me_polling_thread); + static const struct mei_hw_ops mei_me_hw_ops = { .trc_status = mei_me_trc_status, diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h index a071c645e905..ca09274ac299 100644 --- a/drivers/misc/mei/hw-me.h +++ b/drivers/misc/mei/hw-me.h @@ -51,6 +51,8 @@ struct mei_cfg { * @d0i3_supported: di03 support * @hbuf_depth: depth of hardware host/write buffer in slots * @read_fws: read FW status register handler + * @wait_active: the polling thread activity wait queue + * @is_active: the device is active */ struct mei_me_hw { const struct mei_cfg *cfg; @@ -60,10 +62,19 @@ struct mei_me_hw { bool d0i3_supported; u8 hbuf_depth; int (*read_fws)(const struct mei_device *dev, int where, u32 *val); + /* polling */ + struct task_struct *polling_thread; + wait_queue_head_t wait_active; + bool is_active; }; #define to_me_hw(dev) (struct mei_me_hw *)((dev)->hw) +static inline bool mei_me_hw_use_polling(const struct mei_me_hw *hw) +{ + return hw->irq < 0; +} + /** * enum mei_cfg_idx - indices to platform specific configurations. * @@ -127,5 +138,6 @@ int mei_me_pg_exit_sync(struct mei_device *dev); irqreturn_t mei_me_irq_quick_handler(int irq, void *dev_id); irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id); +int mei_me_polling_thread(void *_dev); #endif /* _MEI_INTERFACE_H_ */