From: Yunsheng Lin <linyunsheng@huawei.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: dalias@libc.org, linux-sh@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
catalin.marinas@arm.com, dave.hansen@linux.intel.com,
heiko.carstens@de.ibm.com, jiaxun.yang@flygoat.com,
Michal Hocko <mhocko@kernel.org>,
mwb@linux.vnet.ibm.com, paulus@samba.org, hpa@zytor.com,
sparclinux@vger.kernel.org, chenhc@lemote.com, will@kernel.org,
cai@lca.pw, linux-s390@vger.kernel.org,
ysato@users.sourceforge.jp, linux-acpi@vger.kernel.org,
x86@kernel.org, rppt@linux.ibm.com, borntraeger@de.ibm.com,
dledford@redhat.com, mingo@redhat.com,
jeffrey.t.kirsher@intel.com, jhogan@kernel.org,
mattst88@gmail.com, linux-mips@vger.kernel.org, lenb@kernel.org,
len.brown@intel.com, gor@linux.ibm.com,
anshuman.khandual@arm.com, bp@alien8.de, luto@kernel.org,
bhelgaas@google.com, tglx@linutronix.de,
naveen.n.rao@linux.vnet.ibm.com,
linux-arm-kernel@lists.infradead.org, rth@twiddle.net,
axboe@kernel.dk, linux-pci@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-kernel@vger.kernel.org, ralf@linux-mips.org,
tbogendoerfer@suse.de, paul.burton@mips.com,
linux-alpha@vger.kernel.org, rafael@kernel.org,
ink@jurassic.park.msu.ru, akpm@linux-foundation.org,
Robin Murphy <robin.murphy@arm.com>,
davem@davemloft.net
Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware
Date: Tue, 15 Oct 2019 18:40:29 +0800 [thread overview]
Message-ID: <34450edf-2249-ee7a-fc83-f4a923f75989@huawei.com> (raw)
In-Reply-To: <20191014092509.GA3050088@kroah.com>
On 2019/10/14 17:25, Greg KH wrote:
> On Mon, Oct 14, 2019 at 04:00:46PM +0800, Yunsheng Lin wrote:
>> On 2019/10/12 18:47, Greg KH wrote:
>>> On Sat, Oct 12, 2019 at 12:40:01PM +0200, Greg KH wrote:
>>>> On Sat, Oct 12, 2019 at 05:47:56PM +0800, Yunsheng Lin wrote:
>>>>> On 2019/10/12 15:40, Greg KH wrote:
>>>>>> On Sat, Oct 12, 2019 at 02:17:26PM +0800, Yunsheng Lin wrote:
>>>>>>> add pci and acpi maintainer
>>>>>>> cc linux-pci@vger.kernel.org and linux-acpi@vger.kernel.org
>>>>>>>
>>>>>>> On 2019/10/11 19:15, Peter Zijlstra wrote:
>>>>>>>> On Fri, Oct 11, 2019 at 11:27:54AM +0800, Yunsheng Lin wrote:
>>>>>>>>> But I failed to see why the above is related to making node_to_cpumask_map()
>>>>>>>>> NUMA_NO_NODE aware?
>>>>>>>>
>>>>>>>> Your initial bug is for hns3, which is a PCI device, which really _MUST_
>>>>>>>> have a node assigned.
>>>>>>>>
>>>>>>>> It not having one, is a straight up bug. We must not silently accept
>>>>>>>> NO_NODE there, ever.
>>>>>>>>
>>>>>>>
>>>>>>> I suppose you mean reporting a lack of affinity when the node of a pcie
>>>>>>> device is not set by "not silently accept NO_NODE".
>>>>>>
>>>>>> If the firmware of a pci device does not provide the node information,
>>>>>> then yes, warn about that.
>>>>>>
>>>>>>> As Greg has asked about in [1]:
>>>>>>> what is a user to do when the user sees the kernel reporting that?
>>>>>>>
>>>>>>> We may tell user to contact their vendor for info or updates about
>>>>>>> that when they do not know about their system well enough, but their
>>>>>>> vendor may get away with this by quoting ACPI spec as the spec
>>>>>>> considering this optional. Should the user believe this is indeed a
>>>>>>> fw bug or a misreport from the kernel?
>>>>>>
>>>>>> Say it is a firmware bug, if it is a firmware bug, that's simple.
>>>>>>
>>>>>>> If this kind of reporting is common pratice and will not cause any
>>>>>>> misunderstanding, then maybe we can report that.
>>>>>>
>>>>>> Yes, please do so, that's the only way those boxes are ever going to get
>>>>>> fixed. And go add the test to the "firmware testing" tool that is based
>>>>>> on Linux that Intel has somewhere, to give vendors a chance to fix this
>>>>>> before they ship hardware.
>>>>>>
>>>>>> This shouldn't be a big deal, we warn of other hardware bugs all the
>>>>>> time.
>>>>>
>>>>> Ok, thanks for clarifying.
>>>>>
>>>>> Will send a patch to catch the case when a pcie device without numa node
>>>>> being set and warn about it.
>>>>>
>>>>> Maybe use dev->bus to verify if it is a pci device?
>>>>
>>>> No, do that in the pci bus core code itself, when creating the devices
>>>> as that is when you know, or do not know, the numa node, right?
>>>>
>>>> This can't be in the driver core only, as each bus type will have a
>>>> different way of determining what the node the device is on. For some
>>>> reason, I thought the PCI core code already does this, right?
>>>
>>> Yes, pci_irq_get_node(), which NO ONE CALLS! I should go delete that
>>> thing...
>>>
>>> Anyway, it looks like the pci core code does call set_dev_node() based
>>> on the PCI bridge, so if that is set up properly, all should be fine.
>>>
>>> If not, well, you have buggy firmware and you need to warn about that at
>>> the time you are creating the bridge. Look at the call to
>>> pcibus_to_node() in pci_register_host_bridge().
>>
>> Thanks for pointing out the specific function.
>> Maybe we do not need to warn about the case when the device has a parent,
>> because we must have warned about the parent if the device has a parent
>> and the parent also has a node of NO_NODE, so do not need to warn the child
>> device anymore? like blew:
>>
>> @@ -932,6 +932,10 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
>> list_add_tail(&bus->node, &pci_root_buses);
>> up_write(&pci_bus_sem);
>>
>> + if (nr_node_ids > 1 && !parent &&
>
> Why do you need to check this? If you have a parent, it's your node
> should be set, if not, that's an error, right?
If the device has parent and the parent device also has a node of
NUMA_NO_NODE, then maybe we have warned about the parent device, so
we do not have to warn about the child device?
In pci_register_host_bridge():
if (!parent)
set_dev_node(bus->bridge, pcibus_to_node(bus));
The above only set the node of the bridge device to the node of bus if
the bridge device does not have a parent.
bus->dev.parent = bus->bridge;
dev_set_name(&bus->dev, "%04x:%02x", pci_domain_nr(bus), bus->number);
name = dev_name(&bus->dev);
err = device_register(&bus->dev);
The above then set the bus device's parent to bridge device, and then
call device_register(), which will set the bus device's node according to
bridge device' node.
>
>> + dev_to_node(bus->bridge) == NUMA_NO_NODE)
>> + dev_err(bus->bridge, FW_BUG "No node assigned on NUMA capable HW. Please contact your vendor for updates.\n");
>> +
>> return 0;
>
> Who set that bus->bridge node to NUMA_NO_NODE?
It seems x86 and arm64 may have different implemention of
pcibus_to_node():
For arm64:
int pcibus_to_node(struct pci_bus *bus)
{
return dev_to_node(&bus->dev);
}
And the node of bus is set in:
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
if (!acpi_disabled) {
struct pci_config_window *cfg = bridge->bus->sysdata;
struct acpi_device *adev = to_acpi_device(cfg->parent);
struct device *bus_dev = &bridge->bus->dev;
ACPI_COMPANION_SET(&bridge->dev, adev);
set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
}
return 0;
}
acpi_get_node() may return NUMA_NO_NODE in pcibios_root_bridge_prepare(),
which will set the node of bus_dev to NUMA_NO_NODE
x86:
static inline int __pcibus_to_node(const struct pci_bus *bus)
{
const struct pci_sysdata *sd = bus->sysdata;
return sd->node;
}
And the node of bus is set in pci_acpi_scan_root(), which uses
pci_acpi_root_get_node() get the node of a bus. And it also may return
NUMA_NO_NODE.
> If that is set, the firmware is broken, as you say, but you need to tell
> the user what firmware is broken.
Maybe mentioning the BIOS in log?
dev_err(bus->bridge, FW_BUG "No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.\n");
>
> Try something like this out and see what happens on your machine that
> had things "broken". What does it say?
Does not have a older bios right now.
But always returning NUMA_NO_NODE by below patch:
--- a/drivers/acpi/numa.c
+++ b/drivers/acpi/numa.c
@@ -484,6 +484,7 @@ int acpi_get_node(acpi_handle handle)
pxm = acpi_get_pxm(handle);
- return acpi_map_pxm_to_node(pxm);
+ return -1;
+ //return acpi_map_pxm_to_node(pxm);
it gives the blow warning in my machine:
[ 16.126136] pci0000:00: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 17.733831] pci0000:7b: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 18.020924] pci0000:7a: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 18.552832] pci0000:78: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 19.514948] pci0000:7c: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 20.652990] pci0000:74: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 22.573200] pci0000:80: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 23.225355] pci0000:bb: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 23.514040] pci0000:ba: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 24.050107] pci0000:b8: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 25.017491] pci0000:bc: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
[ 25.557974] pci0000:b4: [Firmware Bug]: No node assigned on NUMA capable HW by BIOS. Please contact your vendor for updates.
>
>> Also, we do not need to warn about that in pci_device_add(), Right?
>> Because we must have warned about the pci host bridge of the pci device.
>
> That should be true, yes.
>
>> I may be wrong about above because I am not so familiar with the pci.
>>
>>>
>>> And yes, you need to do this all on a per-bus-type basis, as has been
>>> pointed out. It's up to the bus to create the device and set this up
>>> properly.
>>
>> Thanks.
>> Will do that on per-bus-type basis.
>
> Good luck, I don't really think that most, if any, of this is needed,
> but hey, it's nice to clean it up where it can be :)
>
> greg k-h
>
> .
>
next prev parent reply other threads:[~2019-10-15 10:42 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 12:48 [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware Yunsheng Lin
2019-09-21 22:38 ` Paul Burton
2019-09-23 2:31 ` Yunsheng Lin
2019-09-23 15:15 ` Peter Zijlstra
2019-09-23 15:28 ` Michal Hocko
2019-09-23 15:48 ` Peter Zijlstra
2019-09-23 16:52 ` Michal Hocko
2019-09-23 20:34 ` Peter Zijlstra
2019-09-24 1:29 ` Yunsheng Lin
2019-09-24 9:25 ` Peter Zijlstra
2019-09-24 11:07 ` Yunsheng Lin
2019-09-24 11:28 ` Peter Zijlstra
2019-09-24 11:44 ` Yunsheng Lin
2019-09-24 11:58 ` Peter Zijlstra
2019-09-24 12:09 ` Yunsheng Lin
2019-09-24 7:47 ` Michal Hocko
2019-09-24 9:17 ` Peter Zijlstra
2019-09-24 10:56 ` Michal Hocko
2019-09-24 11:23 ` Peter Zijlstra
2019-09-24 11:54 ` Michal Hocko
2019-09-24 12:09 ` Peter Zijlstra
2019-09-24 12:25 ` Michal Hocko
2019-09-24 12:43 ` Peter Zijlstra
2019-09-24 12:59 ` Peter Zijlstra
2019-09-24 13:19 ` Michal Hocko
2019-09-25 9:14 ` Yunsheng Lin
2019-09-25 10:41 ` Peter Zijlstra
2019-10-08 8:38 ` Yunsheng Lin
2019-10-09 12:25 ` Robin Murphy
2019-10-10 6:07 ` Yunsheng Lin
2019-10-10 7:32 ` Michal Hocko
2019-10-11 3:27 ` Yunsheng Lin
2019-10-11 11:15 ` Peter Zijlstra
2019-10-12 6:17 ` Yunsheng Lin
2019-10-12 7:40 ` Greg KH
2019-10-12 9:47 ` Yunsheng Lin
2019-10-12 10:40 ` Greg KH
2019-10-12 10:47 ` Greg KH
2019-10-14 8:00 ` Yunsheng Lin
2019-10-14 9:25 ` Greg KH
2019-10-14 9:49 ` Peter Zijlstra
2019-10-14 10:04 ` Greg KH
2019-10-15 10:40 ` Yunsheng Lin [this message]
2019-10-15 16:58 ` Greg KH
2019-10-16 12:07 ` Yunsheng Lin
2019-10-28 9:20 ` Yunsheng Lin
2019-10-29 8:53 ` Michal Hocko
2019-10-30 1:58 ` Yunsheng Lin
2019-10-10 8:56 ` Peter Zijlstra
2019-09-25 10:40 ` Peter Zijlstra
2019-09-25 13:25 ` Michal Hocko
2019-09-25 16:31 ` Peter Zijlstra
2019-09-25 21:45 ` Peter Zijlstra
2019-09-26 9:05 ` Peter Zijlstra
2019-09-26 12:10 ` Peter Zijlstra
2019-09-26 11:45 ` Geert Uytterhoeven
2019-09-26 12:24 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=34450edf-2249-ee7a-fc83-f4a923f75989@huawei.com \
--to=linyunsheng@huawei.com \
--cc=akpm@linux-foundation.org \
--cc=anshuman.khandual@arm.com \
--cc=axboe@kernel.dk \
--cc=bhelgaas@google.com \
--cc=borntraeger@de.ibm.com \
--cc=bp@alien8.de \
--cc=cai@lca.pw \
--cc=catalin.marinas@arm.com \
--cc=chenhc@lemote.com \
--cc=dalias@libc.org \
--cc=dave.hansen@linux.intel.com \
--cc=davem@davemloft.net \
--cc=dledford@redhat.com \
--cc=gor@linux.ibm.com \
--cc=gregkh@linuxfoundation.org \
--cc=heiko.carstens@de.ibm.com \
--cc=hpa@zytor.com \
--cc=ink@jurassic.park.msu.ru \
--cc=jeffrey.t.kirsher@intel.com \
--cc=jhogan@kernel.org \
--cc=jiaxun.yang@flygoat.com \
--cc=len.brown@intel.com \
--cc=lenb@kernel.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=luto@kernel.org \
--cc=mattst88@gmail.com \
--cc=mhocko@kernel.org \
--cc=mingo@redhat.com \
--cc=mwb@linux.vnet.ibm.com \
--cc=naveen.n.rao@linux.vnet.ibm.com \
--cc=paul.burton@mips.com \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=rafael@kernel.org \
--cc=ralf@linux-mips.org \
--cc=rjw@rjwysocki.net \
--cc=robin.murphy@arm.com \
--cc=rppt@linux.ibm.com \
--cc=rth@twiddle.net \
--cc=sparclinux@vger.kernel.org \
--cc=tbogendoerfer@suse.de \
--cc=tglx@linutronix.de \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=ysato@users.sourceforge.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).