linux-kernel - Re: console issue since 3.6, console=ttyS1 hangs

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Date:   Fri, 28 Oct 2016 14:42:25 -0500
From:   Nathan Zimmer <nzimmer@....com>
To:     Sean Young <sean@...s.org>
Cc:     Nathan Zimmer <nzimmer@....com>, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        alan@...ux.intel.com,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: console issue since 3.6, console=ttyS1 hangs

On Thu, Oct 27, 2016 at 09:19:16PM +0100, Sean Young wrote:
> On Wed, Oct 26, 2016 at 01:16:16PM -0500, Nathan Zimmer wrote:
> > On 10/25/2016 03:41 PM, Sean Young wrote:
> > >On Mon, Oct 24, 2016 at 04:49:25PM -0500, Nathan Zimmer wrote:
> > >>[    1.565062] serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A
> > >The isa probe driver find the serial port.
> > >
> > >>[    1.566453] serial 00:04: pnp_assign_resources, try dependent set 0
> > >>[    1.567383] serial 00:04:   couldn't assign io 0 (min 0x2f8 max 0x2f8)
> > >But then decides that the port is already in use (the existing serial driver).
> > >>[    1.568366] serial 00:04: pnp_assign_resources failed (-16)
> > >>[    1.569188] serial 00:04: unable to assign resources
> > >>[    1.569924] serial: probe of 00:04 failed with error -16
> > >Please try and boot 3.7.0 with "8250.share_irqs=1", maybe it will pick
> > >irq 3 and it will be happy again, but that is just a guess.
> > >
> > >I think I have not fully understood what the failure is. Does the serial
> > >port not work or does the boot hang? What are the symptoms?
> > With console=ttyS1 the boot will "hang", sometimes it makes it all the way
> > through but may take 30 minutes, instead of the 2-4 minutes this box
> 
> Where does it hang? Any error messages?
> 

Shortly after mounting the root.
After that I get no more output...

Here is a failure log from 4.8.

> > >We might be able to fix the problem with a pnp quirk but 3.7 is has not had
> > >any releases for a long time. We will need a reproduction on a concurrent
> > >kernel so a patch can be written for that.
> > Yes it still happens with 4.8+
> > I had only started dwelling on 3.6/3.7 since that is where it first appears
> > and don't have any attachment to those.
> 
> Ok. Please try to following patch. I'm not sure it is good enough to be
> merged as-is, but should provide a start for testing. Output with
> CONFIG_PNP_DEBUG_MESSAGES should show only irq 3 is available for the 
> serial port now.
> 
> Sean
> 
> From 3a1705a2e28f4385b778ad96d7c517b82ea860e2 Mon Sep 17 00:00:00 2001
> From: Sean Young <sean@...s.org>
> Date: Thu, 27 Oct 2016 20:13:50 +0100
> Subject: [PATCH] PNP: Add quirk for BIOS advertising wrong irqs for serial
>  port
> 
> Signed-off-by: Sean Young <sean@...s.org>
> ---
>  drivers/pnp/quirks.c | 43 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
> index d28e3ab..8712161 100644
> --- a/drivers/pnp/quirks.c
> +++ b/drivers/pnp/quirks.c
> @@ -66,6 +66,48 @@ static void quirk_awe32_resources(struct pnp_dev *dev)
>  	}
>  }
>  
> +static void quirk_serial_port(struct pnp_dev *dev)
> +{
> +	struct pnp_option *option;
> +	struct pnp_irq *irq;
> +	struct pnp_port *port;
> +
> +	list_for_each_entry(option, &dev->options, list) {
> +		if (!pnp_option_is_dependent(option))
> +			continue;
> +
> +		if (option->type == IORESOURCE_IO) {
> +			port = &option->u.port;
> +
> +			if (port->min != 0x2f8 || port->max != 0x2f8 ||
> +				port->size != 8 || port->align != 1)
> +				return;
> +		} else if (option->type == IORESOURCE_IRQ) {
> +			pnp_irq_mask_t map;
> +
> +			irq = &option->u.irq;
> +
> +			bitmap_zero(map.bits, PNP_IRQ_NR);
> +			__set_bit(3, map.bits);
> +			__set_bit(4, map.bits);
> +			__set_bit(5, map.bits);
> +			__set_bit(6, map.bits);
> +			__set_bit(7, map.bits);
> +			__set_bit(10, map.bits);
> +			__set_bit(11, map.bits);
> +			__set_bit(12, map.bits);
> +
> +			if (!bitmap_equal(map.bits, irq->map.bits, PNP_IRQ_NR))
> +				return;
> +		}
> +	}
> +
> +	if (irq && port) {
> +		bitmap_zero(irq->map.bits, PNP_IRQ_NR);
> +		__set_bit(3, irq->map.bits);
> +	}
> +}
> +
>  static void quirk_cmi8330_resources(struct pnp_dev *dev)
>  {
>  	struct pnp_option *option;
> @@ -448,6 +490,7 @@ static struct pnp_fixup pnp_fixups[] = {
>  #ifdef CONFIG_PCI
>  	{"PNP0c02", quirk_intel_mch},
>  #endif
> +	{"PNP0c02", quirk_serial_port},
>  	{""}
>  };
>  
> -- 
> 2.7.4
> 

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