From: Jon Masters <jcm@redhat.com>
To: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Mark Rutland <mark.rutland@arm.com>,
Olof Johansson <olof@lixom.net>,
Grant Likely <grant.likely@linaro.org>,
linaro-acpi@lists.linaro.org, Liviu Dudau <Liviu.Dudau@arm.com>,
Lv Zheng <lv.zheng@intel.com>, Rob Herring <robh@kernel.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Robert Moore <robert.moore@intel.com>,
linux-acpi@vger.kernel.org, Charles.Garcia-Tobin@arm.com,
Robert Richter <rric@kernel.org>,
Jason Cooper <jason@lakedaemon.net>,
Arnd Bergmann <arnd@arndb.de>,
Marc Zyngier <marc.zyngier@arm.com>,
Will Deacon <will.deacon@arm.com>,
Tomasz Nowicki <tomasz.nowicki@linaro.org>,
Mark Brown <broonie@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
linux-arm-kernel@lists.infradead.org,
Graeme Gregory <graeme.gregory@linaro.org>,
Randy Dunlap <rdunlap@infradead.org>,
linux-kernel@vger.kernel.org, Sudeep Holla <Sudeep.Holla@arm.com>
Subject: Re: [PATCH v3 09/17] ARM64 / ACPI: Parse MADT for SMP initialization
Date: Tue, 09 Sep 2014 12:04:15 -0400 [thread overview]
Message-ID: <540F24FF.2060302@redhat.com> (raw)
In-Reply-To: <540F2422.90105@linaro.org>
On 09/09/2014 12:00 PM, Hanjun Guo wrote:
> On 2014年09月09日 13:44, Jon Masters wrote:
>> On 09/09/2014 12:57 AM, Hanjun Guo wrote:
>>> Hi Jon,
>>>
>>> On 2014年09月09日 12:23, Jon Masters wrote:
>>>> On 09/01/2014 10:57 AM, Hanjun Guo wrote:
>>>>> MADT contains the information for MPIDR which is essential for
>>>>> SMP initialization, parse the GIC cpu interface structures to
>>>>> get the MPIDR value and map it to cpu_logical_map(), and add
>>>>> enabled cpu with valid MPIDR into cpu_possible_map.
>>>>>
>>>>> ACPI 5.1 only has two explicit methods to boot up SMP, PSCI and
>>>>> Parking protocol, but the Parking protocol is only specified for
>>>>> ARMv7 now, so make PSCI as the only way for the SMP boot protocol
>>>>> before some updates for the ACPI spec or the Parking protocol spec.
>>>>> + /* CPU 0 was already initialized */
>>>>> + if (cpu) {
>>>>> + if (cpu_ops[cpu]->cpu_init(NULL, cpu))
>>>>> + return -EOPNOTSUPP;
>>>>> +
>>>>> + /* map the logical cpu id to cpu MPIDR */
>>>>> + cpu_logical_map(cpu) = mpidr;
>>>> I'm not sure it's worth noting in a comment or just in the dialogue that
>>>> none of these MPIDR values is literally the value in the MPIDR. Linux
>>>> doesn't store that anyway (even in the cpu_logical_map), since it is
>>>> pre-filtered against MPIDR_HWID_BITMASK to remove the non-affinity level
>>>> bits. And since the ACPI5.1 specification requires that non-affinity
>>>> bits be zero everything works. But it relies upon this assumption so it
>>>> might be worth explicitly masking out the bits when making the call into:
>>>>
>>>> acpi_map_gic_cpu_interface(processor->arm_mpidr,
>>>> processor->flags & ACPI_MADT_ENABLED);
>>>>
>>>> During the parsing of the processor object's MPIDR value.
>>> Yes, I agree with you. When I tested this patch set on our
>>> ARM64 platform, I found this problem too. some firmware
>>> will just present the real MPIDR value to OS which some reserved
>>> bit set to 1, and it will lead to some logic problem in this patch.
>>> (actually firmware didn't obey with ACPI spec)
>>>
>>> I had updated the patch with:
>>>
>>> + acpi_map_gic_cpu_interface(processor->arm_mpidr & MPIDR_HWID_BITMASK,
>>> + processor->flags & ACPI_MADT_ENABLED);
>>>
>>> and then the problem was gone :)
>> Did I miss an updated patch posting then? It is possible...
>
> No, you didn't miss it, I'm still working on the new version, sorry I didn't
> clarify that in my previous email.
Thanks. If you could copy me on the next posting that would rock. In a
few hours we should have another platform posted as an example. In
addition, a couple of lower priority patches (building upon the core
ACPI pieces) should be posted as well.
Jon.
next prev parent reply other threads:[~2014-09-09 16:05 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-01 14:57 [PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1 Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 01/17] ARM64: Move the init of cpu_logical_map(0) before unflatten_device_tree() Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 02/17] ARM64 / ACPI: Get RSDP and ACPI boot-time tables Hanjun Guo
2014-09-09 16:26 ` Catalin Marinas
2014-09-09 16:41 ` Jon Masters
2014-09-09 16:44 ` Jon Masters
2014-09-09 17:15 ` Mark Rutland
2014-09-09 17:33 ` Jon Masters
2014-09-09 17:50 ` Lorenzo Pieralisi
2014-09-09 18:05 ` Sudeep Holla
2014-09-09 19:06 ` Jon Masters
2014-09-10 11:13 ` Hanjun Guo
2014-09-10 12:33 ` Catalin Marinas
2014-09-10 21:51 ` Grant Likely
2014-09-11 11:01 ` Catalin Marinas
2014-09-14 15:40 ` Grant Likely
2014-09-14 21:59 ` Catalin Marinas
2014-09-15 3:53 ` Grant Likely
2014-09-16 5:29 ` Zheng, Lv
2014-09-10 21:41 ` Grant Likely
2014-09-09 16:54 ` Mark Rutland
2014-09-10 7:30 ` Hanjun Guo
2014-09-10 21:37 ` Grant Likely
2014-09-01 14:57 ` [PATCH v3 03/17] ARM64 / ACPI: Introduce lowlevel suspend function Hanjun Guo
2014-09-09 16:35 ` Catalin Marinas
2014-09-09 22:04 ` Graeme Gregory
2014-09-01 14:57 ` [PATCH v3 04/17] ARM64 / ACPI: Introduce early_param for "acpi" Hanjun Guo
2014-09-09 16:37 ` Catalin Marinas
2014-09-09 17:17 ` Bjorn Helgaas
2014-09-09 22:14 ` Jon Masters
2014-09-10 13:04 ` Will Deacon
2014-09-10 13:21 ` Bjorn Helgaas
2014-09-10 18:30 ` Will Deacon
2014-09-10 21:58 ` Grant Likely
2014-09-01 14:57 ` [PATCH v3 05/17] ARM64 / ACPI: If we chose to boot from acpi then disable FDT Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 06/17] ARM64 / ACPI: Make PCI optional for ACPI on ARM64 Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 07/17] ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 08/17] ACPI / table: Print GIC information when MADT is parsed Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 09/17] ARM64 / ACPI: Parse MADT for SMP initialization Hanjun Guo
2014-09-03 17:21 ` Lorenzo Pieralisi
2014-09-04 15:29 ` Hanjun Guo
2014-09-09 4:29 ` Jon Masters
2014-09-09 5:11 ` Hanjun Guo
2014-09-09 5:34 ` Jon Masters
2014-09-09 16:52 ` Lorenzo Pieralisi
2014-09-09 17:00 ` Jon Masters
2014-09-09 17:02 ` Jon Masters
2014-09-09 4:23 ` Jon Masters
2014-09-09 4:57 ` Hanjun Guo
2014-09-09 5:44 ` Jon Masters
2014-09-09 16:00 ` Hanjun Guo
2014-09-09 16:04 ` Jon Masters [this message]
2014-09-09 16:14 ` Hanjun Guo
2014-09-11 14:15 ` Will Deacon
2014-09-12 21:30 ` Jon Masters
2014-09-11 10:24 ` Grant Likely
2014-09-01 14:57 ` [PATCH v3 10/17] ACPI / processor: Make it possible to get CPU hardware ID via GICC Hanjun Guo
2014-09-03 16:27 ` Lorenzo Pieralisi
2014-09-08 13:10 ` Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 11/17] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi Hanjun Guo
2014-09-11 11:08 ` Grant Likely
2014-09-11 11:34 ` Grant Likely
2014-09-12 9:42 ` Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 12/17] ACPI / table: Add new function to get table entries Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 13/17] ARM64 / ACPI: Add GICv2 specific ACPI boot support Hanjun Guo
2014-09-01 17:35 ` Marc Zyngier
2014-09-02 8:28 ` [Linaro-acpi] " Alexander Spyridakis
2014-09-02 11:48 ` Tomasz Nowicki
2014-09-02 13:02 ` Marc Zyngier
2014-09-02 15:45 ` Hanjun Guo
2014-09-02 15:59 ` Marc Zyngier
2014-09-02 16:11 ` Sudeep Holla
2014-09-03 10:30 ` Marc Zyngier
2014-09-03 11:17 ` Hanjun Guo
2014-09-04 14:03 ` Hanjun Guo
2014-09-09 6:21 ` Jon Masters
2014-09-03 9:26 ` Tomasz Nowicki
2014-09-03 14:57 ` Arnd Bergmann
2014-09-05 8:52 ` Tomasz Nowicki
2014-09-05 9:47 ` Marc Zyngier
2014-09-05 10:13 ` [Linaro-acpi] " Arnd Bergmann
2014-09-05 10:36 ` Tomasz Nowicki
2014-09-05 10:39 ` Marc Zyngier
2014-09-05 10:49 ` Tomasz Nowicki
2014-09-09 6:27 ` Jon Masters
2014-09-11 13:43 ` Grant Likely
2014-09-02 16:34 ` Catalin Marinas
2014-09-11 11:48 ` Grant Likely
2014-09-11 12:01 ` Marc Zyngier
2014-09-09 6:14 ` Jon Masters
2014-09-03 18:42 ` Arnd Bergmann
2014-09-04 10:10 ` Tomasz Nowicki
2014-09-04 10:14 ` Arnd Bergmann
2014-09-04 10:39 ` Tomasz Nowicki
2014-09-09 6:35 ` Jon Masters
2014-09-01 14:57 ` [PATCH v3 14/17] ARM64 / ACPI: Parse GTDT to initialize arch timer Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 15/17] ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 16/17] ARM64 / ACPI: Enable ARM64 in Kconfig Hanjun Guo
2014-09-11 15:18 ` Lorenzo Pieralisi
2014-09-01 14:57 ` [PATCH v3 17/17] Documentation: ACPI for ARM64 Hanjun Guo
2014-09-11 13:29 ` [PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1 Grant Likely
2014-09-11 13:49 ` Will Deacon
2014-09-12 21:38 ` Jon Masters
2014-09-12 21:43 ` Jon Masters
2014-09-15 4:21 ` Grant Likely
2014-09-11 14:23 ` Rafael J. Wysocki
2014-09-11 14:04 ` Grant Likely
2014-09-11 15:37 ` Catalin Marinas
2014-09-11 15:57 ` Sudeep Holla
2014-09-11 16:06 ` Graeme Gregory
2014-09-11 16:14 ` Sudeep Holla
2014-09-15 4:31 ` Grant Likely
2014-09-15 9:15 ` Catalin Marinas
2014-09-15 22:48 ` Grant Likely
2014-09-16 10:12 ` Catalin Marinas
2014-09-11 16:05 ` Olof Johansson
2014-09-15 4:37 ` Grant Likely
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