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Date: Wed, 15 Dec 2021 20:24:52 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...dia.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Christoph Hellwig <hch@...radead.org>
Cc: baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
Alex Williamson <alex.williamson@...hat.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Kevin Tian <kevin.tian@...el.com>,
Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Dan Williams <dan.j.williams@...el.com>, rafael@...nel.org,
Diana Craciun <diana.craciun@....nxp.com>,
Cornelia Huck <cohuck@...hat.com>,
Eric Auger <eric.auger@...hat.com>,
Liu Yi L <yi.l.liu@...el.com>,
Jacob jun Pan <jacob.jun.pan@...el.com>,
Chaitanya Kulkarni <kch@...dia.com>,
Stuart Yoder <stuyoder@...il.com>,
Laurentiu Tudor <laurentiu.tudor@....com>,
Thierry Reding <thierry.reding@...il.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jonathan Hunter <jonathanh@...dia.com>,
Li Yang <leoyang.li@....com>,
Dmitry Osipenko <digetx@...il.com>,
iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/18] driver core: platform: Add driver dma ownership
management
Hi Greg,
On 2021/12/13 8:50, Lu Baolu wrote:
> On 12/10/21 9:23 AM, Lu Baolu wrote:
>> Hi Greg, Jason and Christoph,
>>
>> On 12/9/21 9:20 AM, Lu Baolu wrote:
>>> On 12/7/21 9:16 PM, Jason Gunthorpe wrote:
>>>> On Tue, Dec 07, 2021 at 10:57:25AM +0800, Lu Baolu wrote:
>>>>> On 12/6/21 11:06 PM, Jason Gunthorpe wrote:
>>>>>> On Mon, Dec 06, 2021 at 06:36:27AM -0800, Christoph Hellwig wrote:
>>>>>>> I really hate the amount of boilerplate code that having this in
>>>>>>> each
>>>>>>> bus type causes.
>>>>>> +1
>>>>>>
>>>>>> I liked the first version of this series better with the code near
>>>>>> really_probe().
>>>>>>
>>>>>> Can we go back to that with some device_configure_dma() wrapper
>>>>>> condtionally called by really_probe as we discussed?
>>
>> [...]
>>
>>>
>>> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
>>> index 68ea1f949daa..68ca5a579eb1 100644
>>> --- a/drivers/base/dd.c
>>> +++ b/drivers/base/dd.c
>>> @@ -538,6 +538,32 @@ static int call_driver_probe(struct device *dev,
>>> struct device_driver *drv)
>>> return ret;
>>> }
>>>
>>> +static int device_dma_configure(struct device *dev, struct
>>> device_driver *drv)
>>> +{
>>> + int ret;
>>> +
>>> + if (!dev->bus->dma_configure)
>>> + return 0;
>>> +
>>> + ret = dev->bus->dma_configure(dev);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + if (!drv->suppress_auto_claim_dma_owner)
>>> + ret = iommu_device_set_dma_owner(dev,
>>> DMA_OWNER_DMA_API, NULL);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static void device_dma_cleanup(struct device *dev, struct
>>> device_driver *drv)
>>> +{
>>> + if (!dev->bus->dma_configure)
>>> + return;
>>> +
>>> + if (!drv->suppress_auto_claim_dma_owner)
>>> + iommu_device_release_dma_owner(dev, DMA_OWNER_DMA_API);
>>> +}
>>> +
>>> static int really_probe(struct device *dev, struct device_driver *drv)
>>> {
>>> bool test_remove =
>>> IS_ENABLED(CONFIG_DEBUG_TEST_DRIVER_REMOVE) &&
>>> @@ -574,11 +600,8 @@ static int really_probe(struct device *dev,
>>> struct device_driver *drv)
>>> if (ret)
>>> goto pinctrl_bind_failed;
>>>
>>> - if (dev->bus->dma_configure) {
>>> - ret = dev->bus->dma_configure(dev);
>>> - if (ret)
>>> - goto probe_failed;
>>> - }
>>> + if (device_dma_configure(dev, drv))
>>> + goto pinctrl_bind_failed;
>>>
>>> ret = driver_sysfs_add(dev);
>>> if (ret) {
>>> @@ -660,6 +683,8 @@ static int really_probe(struct device *dev,
>>> struct device_driver *drv)
>>> if (dev->bus)
>>>
>>> blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
>>>
>>> BUS_NOTIFY_DRIVER_NOT_BOUND, dev);
>>> +
>>> + device_dma_cleanup(dev, drv);
>>> pinctrl_bind_failed:
>>> device_links_no_driver(dev);
>>> devres_release_all(dev);
>>> @@ -1204,6 +1229,7 @@ static void __device_release_driver(struct
>>> device *dev, struct device *parent)
>>> else if (drv->remove)
>>> drv->remove(dev);
>>>
>>> + device_dma_cleanup(dev, drv);
>>> device_links_driver_cleanup(dev);
>>>
>>> devres_release_all(dev);
>>> diff --git a/include/linux/device/driver.h
>>> b/include/linux/device/driver.h
>>> index a498ebcf4993..374a3c2cc10d 100644
>>> --- a/include/linux/device/driver.h
>>> +++ b/include/linux/device/driver.h
>>> @@ -100,6 +100,7 @@ struct device_driver {
>>> const char *mod_name; /* used for built-in
>>> modules */
>>>
>>> bool suppress_bind_attrs; /* disables bind/unbind via
>>> sysfs */
>>> + bool suppress_auto_claim_dma_owner;
>>> enum probe_type probe_type;
>>>
>>> const struct of_device_id *of_match_table;
>>
>> Does this work for you? Can I work towards this in the next version?
>
> A kindly ping ... Is this heading the right direction? I need your
> advice to move ahead. :-)
Can I do it like this? :-)
Best regards,
baolu
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