From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 135D01B7FD for ; Thu, 23 May 2024 16:04:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716480267; cv=none; b=AUQ96F0mzH0SQp6qUmCMrW9ZEqED0nV0mm3BQZgktRaz40u3v1mbhTj1msMdg03TxR2K+YaxNnZZKRBI7UzfdYoaxjx2dGx96IM8qERQHZ0Kq6O/vtPBbsh+IIuskOQA+mzkSN6YHeG87qrPhzQLZsEj96OJMZjObj/uQaydHlU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716480267; c=relaxed/simple; bh=EhTBCoWEsH6RQeHWfu+3Ppem+Bmf+xIMkgx/LOGt+8s=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=YzbCRzYp3CPUY9Pi0KQPnNO6Hpw9anJiSrIet15hJWgi0EPmIV7U79DDyBquSRB1QFddZSMZCZAMfE1Fo2pVck+LPxICeZFg0oIDk0YlpUiB0rOf0aZ6fgscJ3zC2YSjVYLpqJR8E9CBhQC0fASvOsCnWsoOqSO53f/Jh5zoLHc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--sebastianene.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=RXxeiBjj; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--sebastianene.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="RXxeiBjj" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-de0b4063e59so13644670276.3 for ; Thu, 23 May 2024 09:04:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1716480265; x=1717085065; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=3d3iyJqmM/1eDHi6IVV043bTCqbOnpQe2A0l9FAURNs=; b=RXxeiBjjFncawXnhuOMFZDJN5S23C+oXf0DEXlPgBqL108Uwku/Z+RmPh9S7gWEPsl N3ndt7oExXpqqgzIITD6ugUGkN8CBJskCX8Hvfz9638+vPGAlWPrpYmR6O6Zpj9mvpAT CuX7RWD8P3SXOSvKBQTb71FwKeFY+c68HEPKzUkDYoYI59yToe4VirrkZ76WP5q0KKTu jGAbtt6CKpjBjRJh3pEUB/95sARYDXm/7eWU3ef8p326OaFQnkkl4fY0XLlUI3EiMmSi fuevxJCBy8hHUGEkHG4jLxtUQAxJ0hKXk2DjXz+uSyKEiV29C0zbFYQbx+HnkRy/P5Te eKEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716480265; x=1717085065; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=3d3iyJqmM/1eDHi6IVV043bTCqbOnpQe2A0l9FAURNs=; b=q5LP5I8bKIYrFiR7ZzNOrNagvpoR2LKY917kdMuwjyWvXIJ8R+JmX887yU6qIOEWz1 5EfDeJSj0w6nMlLJ4+EbkkwUeqVlbqofGp7YrZY9QIlxij7ln7TUgl8pw9Ix+Lj2NQR3 YusSj1NnaoTmSR31+HmDG/xhY45dhcCGplEdtajOkBDaIump+AgcZt33R+n5JkmXD3kd gzIUZ91IT//suTZJaZftqUgv1BJddDawGgI/G2NZzjcWeBFOOrwbx1Wso9Xg/UGdKu67 Fsw7cISgMj7CZbl56TDYztKUIbIOyo55t+qjOma+G7JORzJ+3gvpu7CYHMDmJk0I2lqp 9EfQ== X-Forwarded-Encrypted: i=1; AJvYcCXFWYRtEb4KrOLsGvWfLXt5jmW3RntxlGLAUlvtR0w8/TAldIn/+edPaE5qthr5WoITcHWsCNIFmtmvetwzbe0fCrMnLzGyihY44w== X-Gm-Message-State: AOJu0YyNBoAvV0npry9+1AHn3jvT+D6obkFH3fKNU5fQ8k9qrgRPb7M3 Oe2FV70z8ThQ193apPDbzR3pBs8VGbKWSMoTewtwR57APQ1Vxyg4Lyi6KvDnNFlJYFeU9gwFUNU 3GKChaMocokB/ah9bjjFah1keaQ== X-Google-Smtp-Source: AGHT+IESLjYZSJRI10bNAhY1mQgDdw0aTOQt2wYMTwe81yGAhnG89hGg49am+K4s35CF2jj0v1b5wbDesfLFNl9I1x0= X-Received: from sebkvm.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:cd5]) (user=sebastianene job=sendgmr) by 2002:a05:6902:1207:b0:df4:db4d:5db2 with SMTP id 3f1490d57ef6-df4e0bcd6d0mr1593000276.7.1716480265117; Thu, 23 May 2024 09:04:25 -0700 (PDT) Date: Thu, 23 May 2024 16:04:13 +0000 In-Reply-To: <20240523160413.868830-1-sebastianene@google.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240523160413.868830-1-sebastianene@google.com> X-Mailer: git-send-email 2.45.1.288.g0e0cd299f1-goog Message-ID: <20240523160413.868830-3-sebastianene@google.com> Subject: [PATCH 2/2] misc: Register a PPI for the vcpu stall detection virtual device From: Sebastian Ene To: arnd@arndb.de, gregkh@linuxfoundation.org, will@kernel.org, maz@kernel.org, Rob Herring , Dragan Cvetic , Guenter Roeck Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, kernel-team@android.com, Sebastian Ene Content-Type: text/plain; charset="UTF-8" Request a PPI for each vCPU during probe which will be used by the host to communicate a stall detected event on the vCPU. When the host raises this interrupt from the virtual machine monitor, the guest is expected to handle the interrupt and panic. Signed-off-by: Sebastian Ene --- drivers/misc/vcpu_stall_detector.c | 41 ++++++++++++++++++++++++++++-- 1 file changed, 39 insertions(+), 2 deletions(-) diff --git a/drivers/misc/vcpu_stall_detector.c b/drivers/misc/vcpu_stall_detector.c index e2015c87f03f..c580cd7fd225 100644 --- a/drivers/misc/vcpu_stall_detector.c +++ b/drivers/misc/vcpu_stall_detector.c @@ -32,6 +32,7 @@ struct vcpu_stall_detect_config { u32 clock_freq_hz; u32 stall_timeout_sec; + int ppi_irq; void __iomem *membase; struct platform_device *dev; @@ -77,6 +78,12 @@ vcpu_stall_detect_timer_fn(struct hrtimer *hrtimer) return HRTIMER_RESTART; } +static irqreturn_t vcpu_stall_detector_irq(int irq, void *dev) +{ + panic("vCPU stall detector"); + return IRQ_HANDLED; +} + static int start_stall_detector_cpu(unsigned int cpu) { u32 ticks, ping_timeout_ms; @@ -132,7 +139,7 @@ static int stop_stall_detector_cpu(unsigned int cpu) static int vcpu_stall_detect_probe(struct platform_device *pdev) { - int ret; + int ret, irq, num_irqs; struct resource *r; void __iomem *membase; u32 clock_freq_hz = VCPU_STALL_DEFAULT_CLOCK_HZ; @@ -169,9 +176,32 @@ static int vcpu_stall_detect_probe(struct platform_device *pdev) vcpu_stall_config = (struct vcpu_stall_detect_config) { .membase = membase, .clock_freq_hz = clock_freq_hz, - .stall_timeout_sec = stall_timeout_sec + .stall_timeout_sec = stall_timeout_sec, + .ppi_irq = -1, }; + num_irqs = platform_irq_count(pdev); + if (num_irqs < 0) { + dev_err(&pdev->dev, "Failed to get irqs\n"); + ret = num_irqs; + goto err; + } else if (num_irqs > 1) { + dev_err(&pdev->dev, "Multipple irqs detected\n"); + ret = -EINVAL; + goto err; + } else if (num_irqs == 1) { + irq = platform_get_irq(pdev, 0); + if ((irq > 0) && irq_is_percpu_devid(irq)) { + ret = request_percpu_irq(irq, + vcpu_stall_detector_irq, + "vcpu_stall_detector", + vcpu_stall_detectors); + if (!ret) + vcpu_stall_config.ppi_irq = irq; + + } + } + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "virt/vcpu_stall_detector:online", start_stall_detector_cpu, @@ -184,6 +214,9 @@ static int vcpu_stall_detect_probe(struct platform_device *pdev) vcpu_stall_config.hp_online = ret; return 0; err: + if (vcpu_stall_config.ppi_irq > 0) + free_percpu_irq(vcpu_stall_config.ppi_irq, + vcpu_stall_detectors); return ret; } @@ -193,6 +226,10 @@ static void vcpu_stall_detect_remove(struct platform_device *pdev) cpuhp_remove_state(vcpu_stall_config.hp_online); + if (vcpu_stall_config.ppi_irq > 0) + free_percpu_irq(vcpu_stall_config.ppi_irq, + vcpu_stall_detectors); + for_each_possible_cpu(cpu) stop_stall_detector_cpu(cpu); } -- 2.45.1.288.g0e0cd299f1-goog