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Message-ID: <520ce28050c29cca754493f0595d4a64d45796ee.camel@infradead.org>
Subject: Re: [RFC PATCH 2/2] arm64: Use SYSTEM_OFF2 PSCI call to power off
 for hibernate
From: David Woodhouse <dwmw2@infradead.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, Paolo Bonzini
 <pbonzini@redhat.com>, Jonathan Corbet <corbet@lwn.net>, Marc Zyngier
 <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, James Morse
 <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Zenghui
 Yu <yuzenghui@huawei.com>, Catalin Marinas <catalin.marinas@arm.com>, Will
 Deacon <will@kernel.org>, Mark Rutland <mark.rutland@arm.com>, Lorenzo
 Pieralisi <lpieralisi@kernel.org>, "Rafael J. Wysocki" <rafael@kernel.org>,
 Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>, Mostafa Saleh
 <smostafa@google.com>, Jean-Philippe Brucker <jean-philippe@linaro.org>, 
 linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
 kvmarm@lists.linux.dev,  linux-pm@vger.kernel.org
Date: Tue, 12 Mar 2024 16:36:05 +0000
In-Reply-To: <ZfB7c9ifUiZR6gy1@bogus>
References: <20240312135958.727765-1-dwmw2@infradead.org>
	 <20240312135958.727765-3-dwmw2@infradead.org> <ZfB7c9ifUiZR6gy1@bogus>
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On Tue, 2024-03-12 at 15:57 +0000, Sudeep Holla wrote:
> Looked briefly at register_sys_off_handler and it should be OK to call
> it from psci_init_system_off2() below. Any particular reason for having
> separate initcall to do this ? We can even eliminate the need for
> psci_init_system_off2 if it can be called from there. What am I missing ?

My first attempt did that. I don't think we can kmalloc that early:

[    0.000000] psci: SMC Calling Convention v1.1
[    0.000000] Unable to handle kernel read from unreadable memory at virtu=
al address 0000000000000018
[    0.000000] Mem abort info:
[    0.000000]   ESR =3D 0x0000000096000004
[    0.000000]   EC =3D 0x25: DABT (current EL), IL =3D 32 bits
[    0.000000]   SET =3D 0, FnV =3D 0
[    0.000000]   EA =3D 0, S1PTW =3D 0
[    0.000000]   FSC =3D 0x04: level 0 translation fault
[    0.000000] Data abort info:
[    0.000000]   ISV =3D 0, ISS =3D 0x00000004, ISS2 =3D 0x00000000
[    0.000000]   CM =3D 0, WnR =3D 0, TnD =3D 0, TagAccess =3D 0
[    0.000000]   GCS =3D 0, Overlay =3D 0, DirtyBit =3D 0, Xs =3D 0
[    0.000000] [0000000000000018] user address but active_mm is swapper
[    0.000000] Internal error: Oops: 0000000096000004 [#1] SMP
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.8.0-rc3+ #30
[    0.000000] pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=
=3D--)
[    0.000000] pc : kmalloc_trace+0x138/0x340
[    0.000000] lr : register_sys_off_handler+0x60/0x258
[    0.000000] sp : ffff8000827d3d10
[    0.000000] x29: ffff8000827d3d20 x28: 000000005cd7e0ac x27: 00000000000=
01f3f
[    0.000000] x26: 0000000000000000 x25: ffff8000802bd890 x24: ffff8000802=
bd890
[    0.000000] x23: 0000000000000040 x22: 0000000000000dc0 x21: 00000000000=
00001
[    0.000000] x20: 0000000000000000 x19: 0000000000000000 x18: 00000000000=
00006
[    0.000000] x17: 000000000036fd40 x16: 000000005ec902c0 x15: ffff8000827=
d37c0
[    0.000000] x14: 0000000000000000 x13: 312e3176206e6f69 x12: 746e65766e6=
f4320
[    0.000000] x11: 00000000ffffdfff x10: ffff8000828cebe0 x9 : ffff8000828=
1ea10
[    0.000000] x8 : ffff8000827d3d78 x7 : 0000000000000000 x6 : 00000000000=
00000
[    0.000000] x5 : 0000000000000000 x4 : ffff8000827e0000 x3 : ffff8000827=
f41c0
[    0.000000] x2 : 0000000000000040 x1 : 0000000000000dc0 x0 : 00000000000=
00000
[    0.000000] Call trace:
[    0.000000]  kmalloc_trace+0x138/0x340
[    0.000000]  register_sys_off_handler+0x60/0x258
[    0.000000]  psci_probe+0x2cc/0x350
[    0.000000]  psci_acpi_init+0x50/0x88
[    0.000000]  setup_arch+0x194/0x278
[    0.000000]  start_kernel+0x7c/0x410
[    0.000000]  __primary_switched+0xb8/0xc8
[    0.000000] Code: b5000f7a f94003f4 aa1803fe d50320ff (b9401a64)=20
[    0.000000] ---[ end trace 0000000000000000 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the i=
dle task! ]---


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