From: Jeremy Linton <jeremy.linton@arm.com>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
hanjun.guo@linaro.org, lorenzo.pieralisi@arm.com,
rjw@rjwysocki.net, will.deacon@arm.com, catalin.marinas@arm.com,
gregkh@linuxfoundation.org, viresh.kumar@linaro.org,
mark.rutland@arm.com, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, jhugo@codeaurora.org,
wangxiongfeng2@huawei.com, Jonathan.Zhang@cavium.com,
ahs3@redhat.com, Jayachandran.Nair@cavium.com,
austinwc@codeaurora.org, lenb@kernel.org, vkilari@codeaurora.org,
morten.rasmussen@arm.com, Palmer Dabbelt <palmer@sifive.com>,
Albert Ou <albert@sifive.com>
Subject: Re: [PATCH v6 02/12] drivers: base: cacheinfo: setup DT cache properties early
Date: Fri, 19 Jan 2018 17:27:21 -0600 [thread overview]
Message-ID: <6627a9ef-8d62-3cdf-dbea-390770991f30@arm.com> (raw)
In-Reply-To: <05a8b375-70c4-34d4-6cde-8dd4cd62c10b@arm.com>
Hi,
On 01/18/2018 04:14 AM, Sudeep Holla wrote:
>
>
> On 17/01/18 18:51, Jeremy Linton wrote:
>> Hi,
>>
>> On 01/17/2018 12:20 PM, Sudeep Holla wrote:
>>>
>>>
>>> On 16/01/18 21:07, Jeremy Linton wrote:
>>>> Hi,
>>>>
>>>> On 01/15/2018 06:33 AM, Sudeep Holla wrote:
>>>>> On Fri, Jan 12, 2018 at 06:59:10PM -0600, Jeremy Linton wrote:
>>>>>> The original intent in cacheinfo was that an architecture
>>>>>> specific populate_cache_leaves() would probe the hardware
>>>>>> and then cache_shared_cpu_map_setup() and
>>>>>> cache_override_properties() would provide firmware help to
>>>>>> extend/expand upon what was probed. Arm64 was really
>>>>>> the only architecture that was working this way, and
>>>>>> with the removal of most of the hardware probing logic it
>>>>>> became clear that it was possible to simplify the logic a bit.
>>>>>>
>>>>>> This patch combines the walk of the DT nodes with the
>>>>>> code updating the cache size/line_size and nr_sets.
>>>>>> cache_override_properties() (which was DT specific) is
>>>>>> then removed. The result is that cacheinfo.of_node is
>>>>>> no longer used as a temporary place to hold DT references
>>>>>> for future calls that update cache properties. That change
>>>>>> helps to clarify its one remaining use (matching
>>>>>> cacheinfo nodes that represent shared caches) which
>>>>>> will be used by the ACPI/PPTT code in the following patches.
>>>>>>
>>>>>> Cc: Palmer Dabbelt <palmer@sifive.com>
>>>>>> Cc: Albert Ou <albert@sifive.com>
>>>>>> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
>>>>>> ---
>>>>>> arch/riscv/kernel/cacheinfo.c | 1 +
>>>>>> drivers/base/cacheinfo.c | 65
>>>>>> +++++++++++++++++++------------------------
>>>>>> include/linux/cacheinfo.h | 1 +
>>>>>> 3 files changed, 31 insertions(+), 36 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/riscv/kernel/cacheinfo.c
>>>>>> b/arch/riscv/kernel/cacheinfo.c
>>>>>> index 10ed2749e246..6f4500233cf8 100644
>>>>>> --- a/arch/riscv/kernel/cacheinfo.c
>>>>>> +++ b/arch/riscv/kernel/cacheinfo.c
>>>>>> @@ -30,6 +30,7 @@ static void ci_leaf_init(struct cacheinfo
>>>>>> *this_leaf,
>>>>>> CACHE_WRITE_BACK
>>>>>> | CACHE_READ_ALLOCATE
>>>>>> | CACHE_WRITE_ALLOCATE;
>>>>>> + cache_of_set_props(this_leaf, node);
>>>>>
>>>>> This may be necessary but can it be done as later patch ? So far
>>>>> nothing
>>>>> is added that may break riscv IIUC.
>>>>
>>>> Well I think you have a bisection issue where the additional information
>>>> will disappear between this patch and wherever we put this code back in.
>>>>
>>>
>>> Hmm, I am sorry but I fail to see the issue. Before this change,
>>> populate_cache_leaves just populated the info as per ci_leaf_init in
>>> arch/riscv/kernel/cacheinfo.c and cache_override_properties used to fill
>>> the remaining.
>>>
>>> After this patch, the same is achieved in cache_shared_cpu_map_setup.
>>>
>>> In both case, it was by the end of detect_cache_attributes, so I see no
>>> issue.
>>>
>>
>>
>> Hi,
>>
>> I must be misunderstanding something.
>>
>
> Looks like I was missing to understand something :)
>
>> AFAIK, The code in cache_setup_of_node() won't call cache_of_set_props()
>> because it returns when there is an existing of_node (fw_unique) created
>> by the riscv populate_cache_leaves(). That's why I'm making the direct
>> call here. If we fail to get that change in place before
>> cache_override_properties() is removed then the fields not set by the
>> riscv code (size/etc) will be missing.
>
> Indeed. I am trying to avoid use of cache_of_set_props outside.
> How about skipping setting up of fw_unique in ci_leaf_init instead ?
>
I've been thinking about this, but I'm hesitant because I don't have a
good test platform for this code. Plus, I'm not 100% sure that the
results are the same (is it possible that the platform setup node isn't
the same as the one the the common code would find?).
I also think I'm getting a little off topic with these patches in
relation to what the core goal is (adding PPTT parsing).
next prev parent reply other threads:[~2018-01-19 23:27 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-13 0:59 [PATCH v6 00/12] Support PPTT for ARM64 Jeremy Linton
2018-01-13 0:59 ` [PATCH v6 01/12] drivers: base: cacheinfo: move cache_setup_of_node() Jeremy Linton
2018-01-15 12:23 ` Sudeep Holla
2018-01-13 0:59 ` [PATCH v6 02/12] drivers: base: cacheinfo: setup DT cache properties early Jeremy Linton
2018-01-15 12:33 ` Sudeep Holla
2018-01-15 16:07 ` Palmer Dabbelt
2018-01-16 21:26 ` Jeremy Linton
2018-01-17 18:08 ` Sudeep Holla
2018-01-18 17:36 ` Palmer Dabbelt
2018-01-16 21:07 ` Jeremy Linton
2018-01-17 18:20 ` Sudeep Holla
2018-01-17 18:51 ` Jeremy Linton
2018-01-18 10:14 ` Sudeep Holla
2018-01-19 23:27 ` Jeremy Linton [this message]
2018-01-13 0:59 ` [PATCH v6 03/12] cacheinfo: rename of_node to fw_unique Jeremy Linton
2018-01-15 12:36 ` Sudeep Holla
2018-01-13 0:59 ` [PATCH v6 04/12] arm64/acpi: Create arch specific cpu to acpi id helper Jeremy Linton
2018-01-15 13:46 ` Sudeep Holla
2018-01-13 0:59 ` [PATCH v6 05/12] ACPI/PPTT: Add Processor Properties Topology Table parsing Jeremy Linton
2018-01-15 14:58 ` Sudeep Holla
2018-01-16 20:55 ` Jeremy Linton
2018-01-17 17:58 ` Sudeep Holla
2018-01-15 15:48 ` Sudeep Holla
2018-01-16 20:22 ` Jeremy Linton
2018-01-17 18:00 ` Sudeep Holla
2018-01-13 0:59 ` [PATCH v6 06/12] ACPI: Enable PPTT support on ARM64 Jeremy Linton
2018-01-15 13:52 ` Sudeep Holla
2018-01-13 0:59 ` [PATCH v6 07/12] drivers: base cacheinfo: Add support for ACPI based firmware tables Jeremy Linton
2018-01-15 15:06 ` Sudeep Holla
2018-01-22 15:50 ` Greg KH
2018-01-22 21:14 ` Jeremy Linton
2018-01-23 0:11 ` Rafael J. Wysocki
2018-01-13 0:59 ` [PATCH v6 08/12] arm64: " Jeremy Linton
2018-01-15 13:54 ` Sudeep Holla
2018-01-13 0:59 ` [PATCH v6 09/12] ACPI/PPTT: Add topology parsing code Jeremy Linton
2018-01-13 0:59 ` [PATCH v6 10/12] arm64: topology: rename cluster_id Jeremy Linton
2018-01-13 0:59 ` [PATCH v6 11/12] arm64: topology: enable ACPI/PPTT based CPU topology Jeremy Linton
2018-01-25 12:15 ` Xiongfeng Wang
2018-01-25 15:56 ` Jeremy Linton
2018-01-26 4:21 ` Xiongfeng Wang
2018-02-23 11:02 ` Lorenzo Pieralisi
2018-02-24 3:05 ` Xiongfeng Wang
2018-02-25 6:17 ` vkilari
2018-03-01 14:19 ` Morten Rasmussen
2018-02-24 4:37 ` Jeremy Linton
2018-03-01 11:51 ` Morten Rasmussen
2018-01-13 0:59 ` [PATCH v6 12/12] ACPI: Add PPTT to injectable table list Jeremy Linton
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