linux-kernel - Re: v3.19: Nokia N900 (qemu)

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Message-Id: <201502182236.41771@pali>
Date:	Wed, 18 Feb 2015 22:36:41 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	linux-omap@...r.kernel.org
Cc:	Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>,
	Sebastian Reichel <sre@...nel.org>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Felipe Balbi <balbi@...com>, Nishanth Menon <nm@...com>
Subject: Re: v3.19: Nokia N900 (qemu) - omap_aes error

On Monday 09 February 2015 12:25:00 Pali Rohár wrote:
> On Saturday 31 January 2015 16:29:36 Pali Rohár wrote:
> > Hello,
> > 
> > when I enable problematic omap_aes.ko driver (also in DT)
> > for Nokia N900 machine in qemu (it emulates OMAP GP device,
> > not HS) I get this error message in dmesg at modprobe time:
> > 
> > [   37.660339] ------------[ cut here ]------------
> > [   37.663940] WARNING: CPU: 0 PID: 173 at arch/arm/mach-
> > omap2/omap_hwmod.c:2182 _idle+0x28/0x64()
> > [   37.668762] omap_hwmod: aes: idle state can only be
> > entered from enabled state
> > [   37.672271] Modules linked in: omap_aes(+)
> > [   37.675933] CPU: 0 PID: 173 Comm: modprobe Not tainted
> > 3.19.0- rc5+ #299
> > [   37.679534] Hardware name: Nokia RX-51 board
> > [   37.683227] [<c0012678>] (unwind_backtrace) from
> > [<c0010d44>] (show_stack+0x10/0x14)
> > [   37.686920] [<c0010d44>] (show_stack) from [<c0032194>]
> > (warn_slowpath_common+0x84/0xac)
> > [   37.690765] [<c0032194>] (warn_slowpath_common) from
> > [<c003223c>] (warn_slowpath_fmt+0x2c/0x3c)
> > [   37.694366] [<c003223c>] (warn_slowpath_fmt) from
> > [<c0020cb0>] (_idle+0x28/0x64)
> > [   37.698791] [<c0020cb0>] (_idle) from [<c0021078>]
> > (omap_hwmod_idle+0x30/0x78)
> > [   37.702636] [<c0021078>] (omap_hwmod_idle) from
> > [<c00222c4>] (omap_device_idle+0x48/0x6c)
> > [   37.707153] [<c00222c4>] (omap_device_idle) from
> > [<c0022304>] (_od_runtime_suspend+0x1c/0x24)
> > [   37.710723] [<c0022304>] (_od_runtime_suspend) from
> > [<c0269680>] (__rpm_callback+0x8c/0xdc)
> > [   37.714385] [<c0269680>] (__rpm_callback) from
> > [<c0269740>] (rpm_callback+0x70/0x88)
> > [   37.717987] [<c0269740>] (rpm_callback) from [<c0269f74>]
> > (rpm_suspend+0x2e8/0x5a4)
> > [   37.721710] [<c0269f74>] (rpm_suspend) from [<c026a6ec>]
> > (__pm_runtime_idle+0x58/0x9c)
> > [   37.725402] [<c026a6ec>] (__pm_runtime_idle) from
> > [<bf00129c>] (omap_aes_probe+0x15c/0x448 [omap_aes])
> > [   37.733489] [<bf00129c>] (omap_aes_probe [omap_aes]) from
> > [<c0263d78>] (platform_drv_probe+0x48/0x90)
> > [   37.740936] [<c0263d78>] (platform_drv_probe) from
> > [<c02624ec>] (really_probe+0xac/0x1e0)
> > [   37.745025] [<c02624ec>] (really_probe) from [<c0262718>]
> > (driver_probe_device+0x30/0x48)
> > [   37.749847] [<c0262718>] (driver_probe_device) from
> > [<c0262790>] (__driver_attach+0x60/0x84)
> > [   37.753601] [<c0262790>] (__driver_attach) from
> > [<c0261070>] (bus_for_each_dev+0x50/0x84)
> > [   37.758422] [<c0261070>] (bus_for_each_dev) from
> > [<c0261e20>] (bus_add_driver+0xac/0x1bc)
> > [   37.762207] [<c0261e20>] (bus_add_driver) from
> > [<c02630c8>] (driver_register+0x9c/0xe0)
> > [   37.765899] [<c02630c8>] (driver_register) from
> > [<c0008798>] (do_one_initcall+0x100/0x1b0)
> > [   37.769653] [<c0008798>] (do_one_initcall) from
> > [<c0085ca4>] (do_init_module+0x34/0x158)
> > [   37.773590] [<c0085ca4>] (do_init_module) from
> > [<c00868d8>] (SyS_init_module+0x54/0x64)
> > [   37.777252] [<c00868d8>] (SyS_init_module) from
> > [<c000dbe0>] (ret_fast_syscall+0x0/0x30)
> > [   37.780975] ---[ end trace 86c3e025b92e700d ]---
> > [   37.784667] omap-aes 480c5000.aes: OMAP AES hw accel rev:
> > 0.0 [   37.789794] of_dma_request_slave_channel: dma-names
> > property of node '/ocp/aes@...c5000' missing or empty
> > [   37.797668] omap-aes 480c5000.aes: Unable to request in
> > DMA channel
> > [   37.801391]    omap_aes_dma_init: error: -12
> > 
> > Error is not fatal, kernel does not crash and qemu emulation
> > working fine. But error is there.
> > 
> > I'm sure that qemu does not support omap aes hw emulation
> > and so I except error message about missing hw part (or
> > something else). But not above unwind_backtrace error
> > message.
> > 
> > Any idea why it happens? It is probably not related to AES
> > but to DMA. It is for OMAP GP device (but emulated), so can
> > TI comment this problem (as this is not HS under NDA)?
> 
> Hello,
> 
> what does that error line means?
> 
> [   37.668762] omap_hwmod: aes: idle state can only be entered
> from enabled state
> 
> Is not it bug in omap_hwmod.c code?

In qemu dmesg log I see this debug line:

[    0.297851] omap_hwmod: aes: cannot be enabled for reset (3)

So aes is in disabled state.

Should not omap-aes driver check for aes state if is enabled?

-- 
Pali Rohár
pali.rohar@...il.com

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