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Message-ID: <9959cb08-5137-709b-faf6-46fee024630d@arm.com>
Date: Tue, 18 Oct 2022 14:06:05 +0100
From: Robin Murphy <robin.murphy@....com>
To: Jianmin Lv <lvjianmin@...ngson.cn>,
"Rafael J. Wysocki" <rafael@...nel.org>
Cc: Yicong Yang <yangyicong@...wei.com>, yangyicong@...ilicon.com,
lpieralisi@...nel.org, chenhuacai@...ngson.cn,
guohanjun@...wei.com, sudeep.holla@....com, lenb@...nel.org,
robert.moore@...el.com, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, loongarch@...ts.linux.dev,
liulongfang <liulongfang@...wei.com>
Subject: Re: [PATCH V5 1/2] ACPI / scan: Support multiple dma windows with
different offsets
On 2022-10-18 14:00, Jianmin Lv wrote:
>
>
> On 2022/10/18 下午8:56, Rafael J. Wysocki wrote:
>> On Tue, Oct 18, 2022 at 2:50 PM Jianmin Lv <lvjianmin@...ngson.cn> wrote:
>>>
>>>
>>>
>>> On 2022/10/18 下午8:32, Yicong Yang wrote:
>>>> On 2022/10/18 20:00, Robin Murphy wrote:
>>>>> On 2022-10-18 11:08, Rafael J. Wysocki wrote:
>>>>>> On Tue, Oct 18, 2022 at 11:33 AM Yicong Yang
>>>>>> <yangyicong@...wei.com> wrote:
>>>>>>>
>>>>>>> On 2022/9/11 17:06, Jianmin Lv wrote:
>>>>>>>> In DT systems configurations, of_dma_get_range() returns struct
>>>>>>>> bus_dma_region DMA regions; they are used to set-up devices
>>>>>>>> DMA windows with different offset available for translation
>>>>>>>> between DMA
>>>>>>>> address and CPU address.
>>>>>>>>
>>>>>>>> In ACPI systems configuration, acpi_dma_get_range() does not return
>>>>>>>> DMA regions yet and that precludes setting up the
>>>>>>>> dev->dma_range_map
>>>>>>>> pointer and therefore DMA regions with multiple offsets.
>>>>>>>>
>>>>>>>> Update acpi_dma_get_range() to return struct bus_dma_region
>>>>>>>> DMA regions like of_dma_get_range() does.
>>>>>>>>
>>>>>>>> After updating acpi_dma_get_range(), acpi_arch_dma_setup() is
>>>>>>>> changed for
>>>>>>>> ARM64, where the original dma_addr and size are removed as these
>>>>>>>> arguments are now redundant, and pass 0 and U64_MAX for dma_base
>>>>>>>> and size of arch_setup_dma_ops; this is a simplification consistent
>>>>>>>> with what other ACPI architectures also pass to
>>>>>>>> iommu_setup_dma_ops().
>>>>>>>>
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> With this patch we met problem as well. The DMA coherent mask is
>>>>>>> not set correctly
>>>>>>> for a ehci usb controller and lead to the below calltrace:
>>>>>>>
>>>>>>> [ 16.699259] ------------[ cut here ]------------
>>>>>>> [ 16.703855] WARNING: CPU: 0 PID: 853 at
>>>>>>> kernel/dma/mapping.c:499 dma_alloc_attrs+0xc0/0xf0
>>>>>>> [ 16.712082] Modules linked in:
>>>>>>> [ 16.715124] CPU: 0 PID: 853 Comm: kworker/0:3 Not tainted
>>>>>>> 6.1.0-rc1-pipe-deadlock+ #5
>>>>>>> [ 16.722916] Hardware name: Huawei TaiShan 2280 V2/BC82AMDC,
>>>>>>> BIOS 2280-V2 CS V5.B211.01 11/10/2021
>>>>>>> [ 16.731745] Workqueue: events work_for_cpu_fn
>>>>>>> [ 16.736083] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT
>>>>>>> -SSBS BTYPE=--)
>>>>>>> [ 16.743013] pc : dma_alloc_attrs+0xc0/0xf0
>>>>>>> [ 16.747091] lr : dma_pool_alloc+0x11c/0x200
>>>>>>> [ 16.751255] sp : ffff80001e46bb50
>>>>>>> [ 16.754554] x29: ffff80001e46bb50 x28: 0000000000000000 x27:
>>>>>>> 0000000000000000
>>>>>>> [ 16.761657] x26: ffff80000b33ce18 x25: ffff800009cc6c48 x24:
>>>>>>> 0000000000000000
>>>>>>> [ 16.768759] x23: ffff00208c830918 x22: 0000000000001000 x21:
>>>>>>> 0000000000000cc0
>>>>>>> [ 16.775861] x20: ffff00208ae82080 x19: ffff0020865c40d0 x18:
>>>>>>> 0000000000000030
>>>>>>> [ 16.782964] x17: 626d756e20737562 x16: 2064656e67697373 x15:
>>>>>>> ffff00208ae82640
>>>>>>> [ 16.790066] x14: 0000000000000000 x13: 646e756f72616b72 x12:
>>>>>>> 6f77204348207379
>>>>>>> [ 16.797167] x11: 73706f6e79532067 x10: ffff205f43980000 x9 :
>>>>>>> ffff80000830b3ac
>>>>>>> [ 16.804269] x8 : ffff0020861b1b00 x7 : 0000000000000000 x6 :
>>>>>>> 0000000000000000
>>>>>>> [ 16.811371] x5 : 0000000000000000 x4 : 0000000000000000 x3 :
>>>>>>> 0000000000000cc0
>>>>>>> [ 16.818472] x2 : ffff00208c830918 x1 : 0000000000001000 x0 :
>>>>>>> 0000000000000000
>>>>>>> [ 16.825574] Call trace:
>>>>>>> [ 16.828009] dma_alloc_attrs+0xc0/0xf0
>>>>>>> [ 16.831741] dma_pool_alloc+0x11c/0x200
>>>>>>> [ 16.835559] ehci_qh_alloc+0x60/0x12c
>>>>>>> [ 16.839207] ehci_setup+0x18c/0x40c
>>>>>>> [ 16.842680] ehci_pci_setup+0xb8/0x680
>>>>>>> [ 16.846412] usb_add_hcd+0x310/0x5c0
>>>>>>> [ 16.849973] usb_hcd_pci_probe+0x254/0x36c
>>>>>>> [ 16.854051] ehci_pci_probe+0x40/0x60
>>>>>>> [ 16.857698] local_pci_probe+0x48/0xb4
>>>>>>> [ 16.861431] work_for_cpu_fn+0x24/0x40
>>>>>>> [ 16.865163] process_one_work+0x1e0/0x450
>>>>>>> [ 16.869155] worker_thread+0x2cc/0x44c
>>>>>>> [ 16.872886] kthread+0x114/0x120
>>>>>>> [ 16.876099] ret_from_fork+0x10/0x20
>>>>>>> [ 16.879657] ---[ end trace 0000000000000000 ]---
>>>>>>>
>>>>>>> After reverting this patch the problem resolved. Tested on the
>>>>>>> latest 6.1-rc1.
>>>>>>
>>>>>> OK, I'll queue up a revert of this and one more commit depending
>>>>>> on it.
>>>>>
>>>>> FWIW it looks like the fix should be as simple as below.
>>>>>
>>>>
>>>> Looks like it's the case. The change works on my platform, now the
>>>> ehci probed successfully again
>>>> with no calltrace:
>>>>
>>>> Tested-by: Yicong Yang <yangyicong@...ilicon.com>
>>>>
>>>>> Robin.
>>>>>
>>>>> ----->8-----
>>>>> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
>>>>> index 558664d169fc..b6962bff1eae 100644
>>>>> --- a/drivers/acpi/scan.c
>>>>> +++ b/drivers/acpi/scan.c
>>>>> @@ -1509,6 +1509,7 @@ int acpi_dma_get_range(struct device *dev,
>>>>> const struct bus_dma_region **map)
>>>>> goto out;
>>>>> }
>>>>>
>>>>> + *map = r;
>>>>> list_for_each_entry(rentry, &list, node) {
>>>>> if (rentry->res->start >= rentry->res->end) {
>>>>> kfree(r);
>>>>> @@ -1523,8 +1524,6 @@ int acpi_dma_get_range(struct device *dev,
>>>>> const struct bus_dma_region **map)
>>>>> r->offset = rentry->offset;
>>>>> r++;
>>>>> }
>>>>> -
>>>>> - *map = r;
>>>>> }
>>>>> out:
>>>>> acpi_dev_free_resource_list(&list);
>>>>>
>>>
>>> Ohh, yes, map got a wrong value of r because it has been changed.
>>
>> Well, please send me a working patch by EOD tomorrow.
>>
>
> Ok!
In fact there's another related bug in the error path as well. I'm
writing up the patch now...
Thanks,
Robin
>
>
>>> Maybe wo can fix it like this:
>>>
>>> truct bus_dma_region *r, *orig_r;
>>> ...
>>> orig_r = r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL);
>>> ...
>>> *map = orig_r;
>>>
>>>>> .
>
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