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Date: Thu, 9 Dec 2021 09:20:10 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: baolu.lu@...ux.intel.com, Christoph Hellwig <hch@...radead.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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
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?
>>>
>>
>> Are you talking about below change?
>>
>> diff --git a/drivers/base/dd.c b/drivers/base/dd.c
>> index 68ea1f949daa..368f9e530515 100644
>> +++ b/drivers/base/dd.c
>> @@ -577,7 +577,13 @@ static int really_probe(struct device *dev, struct
>> device_driver *drv)
>> if (dev->bus->dma_configure) {
>> ret = dev->bus->dma_configure(dev);
>> if (ret)
>> - goto probe_failed;
>> + goto pinctrl_bind_failed;
>> +
>> + if (!drv->no_kernel_dma) {
>> + ret = iommu_device_set_dma_owner(dev, DMA_OWNER_DMA_API, NULL);
>> + if (ret)
>> + goto pinctrl_bind_failed;
>> + }
>> }
>
> Yes, the suggestion was to put everything that 'if' inside a function
> and then of course a matching undo function.
Followed your suggestion, I refactored the change like below:
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,
NULL);
+}
+
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;
Further suggestions?
Best regards,
baolu
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