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[PATCH v3 0/3] xen/pciback: support driver_override

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  [PATCH v3 0/3] xen/pciback: support driver_override Juergen Gross <jgross@suse.com> - 2016-09-22 10:50 +0200
    [PATCH v3 1/3] xen/pciback: simplify pcistub device handling Juergen Gross <jgross@suse.com> - 2016-09-22 10:50 +0200
      Re: [PATCH v3 1/3] xen/pciback: simplify pcistub device handling Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-09-22 23:00 +0200
    [PATCH v3 3/3] xen/pciback: support driver_override Juergen Gross <jgross@suse.com> - 2016-09-22 10:50 +0200
      Re: [PATCH v3 3/3] xen/pciback: support driver_override Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2016-09-22 23:10 +0200
        Re: [PATCH v3 3/3] xen/pciback: support driver_override Juergen Gross <jgross@suse.com> - 2016-09-23 06:10 +0200
    Re: [Xen-devel] [PATCH v3 0/3] xen/pciback: support driver_override David Vrabel <david.vrabel@citrix.com> - 2016-09-30 16:50 +0200

#1488655 — [PATCH v3 0/3] xen/pciback: support driver_override

Support the driver_override scheme introduced with commit 782a985d7af2
("PCI: Introduce new device binding path using pci_dev.driver_override")

Today you'd need something like:

echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
echo 0000:07:10.0 > /sys/bus/pci/drivers/pciback/new_slot
echo 0000:07:10.0 > /sys/bus/pci/drivers_probe

while with the patch you can use the same mechanism as for similar
drivers like pci-stub and vfio-pci:

echo pciback > /sys/bus/pci/devices/0000\:07\:10.0/driver_override
echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
echo 0000:07:10.0 > /sys/bus/pci/drivers_probe

Changes in V3:
- Added new patches 1 and 2 to do some cleanup and preparatory work.
- patch 3: Add an assigned device to the slot list
- patch 3: Move override check up in order not to miss the PCI_HEADER_TYPE
  check.

Changes in V2:
- Removed now unused label.

*** BLURB HERE ***

Juergen Gross (3):
  xen/pciback: simplify pcistub device handling
  xen/pciback: avoid multiple entries in slot list
  xen/pciback: support driver_override

 drivers/xen/xen-pciback/pci_stub.c | 125 +++++++++++++++++++++++++------------
 1 file changed, 85 insertions(+), 40 deletions(-)

-- 
2.6.6

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#1488660 — [PATCH v3 1/3] xen/pciback: simplify pcistub device handling

The Xen pciback driver maintains a list of all its seized devices.
There are two functions searching the list for a specific device with
basically the same semantics just returning different structures in
case of a match.

Split out the search function.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 drivers/xen/xen-pciback/pci_stub.c | 50 +++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index 258b7c3..79a9e4d 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -149,29 +149,36 @@ static inline void pcistub_device_put(struct pcistub_device *psdev)
 	kref_put(&psdev->kref, pcistub_device_release);
 }
 
+static struct pcistub_device *pcistub_device_find_locked(int domain, int bus,
+							 int slot, int func)
+{
+	struct pcistub_device *psdev;
+
+	list_for_each_entry(psdev, &pcistub_devices, dev_list) {
+		if (psdev->dev != NULL
+		    && domain == pci_domain_nr(psdev->dev->bus)
+		    && bus == psdev->dev->bus->number
+		    && slot == PCI_SLOT(psdev->dev->devfn)
+		    && func == PCI_FUNC(psdev->dev->devfn)) {
+			return psdev;
+		}
+	}
+
+	return NULL;
+}
+
 static struct pcistub_device *pcistub_device_find(int domain, int bus,
 						  int slot, int func)
 {
-	struct pcistub_device *psdev = NULL;
+	struct pcistub_device *psdev;
 	unsigned long flags;
 
 	spin_lock_irqsave(&pcistub_devices_lock, flags);
 
-	list_for_each_entry(psdev, &pcistub_devices, dev_list) {
-		if (psdev->dev != NULL
-		    && domain == pci_domain_nr(psdev->dev->bus)
-		    && bus == psdev->dev->bus->number
-		    && slot == PCI_SLOT(psdev->dev->devfn)
-		    && func == PCI_FUNC(psdev->dev->devfn)) {
-			pcistub_device_get(psdev);
-			goto out;
-		}
-	}
+	psdev = pcistub_device_find_locked(domain, bus, slot, func);
+	if (psdev)
+		pcistub_device_get(psdev);
 
-	/* didn't find it */
-	psdev = NULL;
-
-out:
 	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 	return psdev;
 }
@@ -207,16 +214,9 @@ struct pci_dev *pcistub_get_pci_dev_by_slot(struct xen_pcibk_device *pdev,
 
 	spin_lock_irqsave(&pcistub_devices_lock, flags);
 
-	list_for_each_entry(psdev, &pcistub_devices, dev_list) {
-		if (psdev->dev != NULL
-		    && domain == pci_domain_nr(psdev->dev->bus)
-		    && bus == psdev->dev->bus->number
-		    && slot == PCI_SLOT(psdev->dev->devfn)
-		    && func == PCI_FUNC(psdev->dev->devfn)) {
-			found_dev = pcistub_device_get_pci_dev(pdev, psdev);
-			break;
-		}
-	}
+	psdev = pcistub_device_find_locked(domain, bus, slot, func);
+	if (psdev)
+		found_dev = pcistub_device_get_pci_dev(pdev, psdev);
 
 	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 	return found_dev;
-- 
2.6.6

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#1489531 — Re: [PATCH v3 1/3] xen/pciback: simplify pcistub device handling

On 09/22/2016 04:45 AM, Juergen Gross wrote:
> The Xen pciback driver maintains a list of all its seized devices.
> There are two functions searching the list for a specific device with
> basically the same semantics just returning different structures in
> case of a match.
>
> Split out the search function.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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#1488661 — [PATCH v3 3/3] xen/pciback: support driver_override

Support the driver_override scheme introduced with commit 782a985d7af2
("PCI: Introduce new device binding path using pci_dev.driver_override")

As pcistub_probe() is called for all devices (it has to check for a
match based on the slot address rather than device type) it has to
check for driver_override set to "pciback" itself.

Up to now for assigning a pci device to pciback you need something like:

echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
echo 0000:07:10.0 > /sys/bus/pci/drivers/pciback/new_slot
echo 0000:07:10.0 > /sys/bus/pci/drivers_probe

while with the patch you can use the same mechanism as for similar
drivers like pci-stub and vfio-pci:

echo pciback > /sys/bus/pci/devices/0000\:07\:10.0/driver_override
echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
echo 0000:07:10.0 > /sys/bus/pci/drivers_probe

So e.g. libvirt doesn't need special handling for pciback.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
V3: Move override check up in order not to miss the PCI_HEADER_TYPE
    check.
    Add an assigned device to the slot list.

V2: Removed now unused label
---
 drivers/xen/xen-pciback/pci_stub.c | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index 0179333..6331a95 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -25,6 +25,8 @@
 #include "conf_space.h"
 #include "conf_space_quirks.h"
 
+#define PCISTUB_DRIVER_NAME "pciback"
+
 static char *pci_devs_to_hide;
 wait_queue_head_t xen_pcibk_aer_wait_queue;
 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
@@ -508,15 +510,18 @@ static void pcistub_device_id_add_list(struct pcistub_device_id *new,
 		kfree(new);
 }
 
-static int pcistub_seize(struct pci_dev *dev)
+static int pcistub_seize(struct pci_dev *dev,
+			 struct pcistub_device_id *pci_dev_id)
 {
 	struct pcistub_device *psdev;
 	unsigned long flags;
 	int err = 0;
 
 	psdev = pcistub_device_alloc(dev);
-	if (!psdev)
+	if (!psdev) {
+		kfree(pci_dev_id);
 		return -ENOMEM;
+	}
 
 	spin_lock_irqsave(&pcistub_devices_lock, flags);
 
@@ -537,8 +542,12 @@ static int pcistub_seize(struct pci_dev *dev)
 
 	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
 
-	if (err)
+	if (err) {
+		kfree(pci_dev_id);
 		pcistub_device_put(psdev);
+	} else if (pci_dev_id)
+		pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
+					   dev->bus->number, dev->devfn);
 
 	return err;
 }
@@ -547,11 +556,16 @@ static int pcistub_seize(struct pci_dev *dev)
  * other functions that take the sysfs lock. */
 static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
-	int err = 0;
+	int err = 0, match;
+	struct pcistub_device_id *pci_dev_id = NULL;
 
 	dev_dbg(&dev->dev, "probing...\n");
 
-	if (pcistub_match(dev)) {
+	match = pcistub_match(dev);
+
+	if ((dev->driver_override &&
+	     !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
+	    match) {
 
 		if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
 		    && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
@@ -562,8 +576,16 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
 			goto out;
 		}
 
+		if (!match) {
+			pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_ATOMIC);
+			if (!pci_dev_id) {
+				err = -ENOMEM;
+				goto out;
+			}
+		}
+
 		dev_info(&dev->dev, "seizing device\n");
-		err = pcistub_seize(dev);
+		err = pcistub_seize(dev, pci_dev_id);
 	} else
 		/* Didn't find the device */
 		err = -ENODEV;
@@ -975,7 +997,7 @@ static const struct pci_error_handlers xen_pcibk_error_handler = {
 static struct pci_driver xen_pcibk_pci_driver = {
 	/* The name should be xen_pciback, but until the tools are updated
 	 * we will keep it as pciback. */
-	.name = "pciback",
+	.name = PCISTUB_DRIVER_NAME,
 	.id_table = pcistub_ids,
 	.probe = pcistub_probe,
 	.remove = pcistub_remove,
-- 
2.6.6

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#1489549 — Re: [PATCH v3 3/3] xen/pciback: support driver_override

On 09/22/2016 04:45 AM, Juergen Gross wrote:
> Support the driver_override scheme introduced with commit 782a985d7af2
> ("PCI: Introduce new device binding path using pci_dev.driver_override")
>
> As pcistub_probe() is called for all devices (it has to check for a
> match based on the slot address rather than device type) it has to
> check for driver_override set to "pciback" itself.
>
> Up to now for assigning a pci device to pciback you need something like:
>
> echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
> echo 0000:07:10.0 > /sys/bus/pci/drivers/pciback/new_slot
> echo 0000:07:10.0 > /sys/bus/pci/drivers_probe
>
> while with the patch you can use the same mechanism as for similar
> drivers like pci-stub and vfio-pci:
>
> echo pciback > /sys/bus/pci/devices/0000\:07\:10.0/driver_override
> echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
> echo 0000:07:10.0 > /sys/bus/pci/drivers_probe
>
> So e.g. libvirt doesn't need special handling for pciback.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
> V3: Move override check up in order not to miss the PCI_HEADER_TYPE
>     check.
>     Add an assigned device to the slot list.
>
> V2: Removed now unused label
> ---
>  drivers/xen/xen-pciback/pci_stub.c | 36 +++++++++++++++++++++++++++++-------
>  1 file changed, 29 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
> index 0179333..6331a95 100644
> --- a/drivers/xen/xen-pciback/pci_stub.c
> +++ b/drivers/xen/xen-pciback/pci_stub.c
> @@ -25,6 +25,8 @@
>  #include "conf_space.h"
>  #include "conf_space_quirks.h"
>  
> +#define PCISTUB_DRIVER_NAME "pciback"
> +
>  static char *pci_devs_to_hide;
>  wait_queue_head_t xen_pcibk_aer_wait_queue;
>  /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
> @@ -508,15 +510,18 @@ static void pcistub_device_id_add_list(struct pcistub_device_id *new,
>  		kfree(new);
>  }
>  
> -static int pcistub_seize(struct pci_dev *dev)
> +static int pcistub_seize(struct pci_dev *dev,
> +			 struct pcistub_device_id *pci_dev_id)
>  {
>  	struct pcistub_device *psdev;
>  	unsigned long flags;
>  	int err = 0;
>  
>  	psdev = pcistub_device_alloc(dev);
> -	if (!psdev)
> +	if (!psdev) {
> +		kfree(pci_dev_id);

Here too --- I'd rather have it freed by whoever allocated it (i.e. the
caller). In fact I think you can allocate this here and instead of
passing pci_dev_id pointer pass a flag of some sort.


-boris

>  		return -ENOMEM;
> +	}
>  
>  	spin_lock_irqsave(&pcistub_devices_lock, flags);
>  
> @@ -537,8 +542,12 @@ static int pcistub_seize(struct pci_dev *dev)
>  
>  	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
>  
> -	if (err)
> +	if (err) {
> +		kfree(pci_dev_id);
>  		pcistub_device_put(psdev);
> +	} else if (pci_dev_id)
> +		pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
> +					   dev->bus->number, dev->devfn);
>  
>  	return err;
>  }
> @@ -547,11 +556,16 @@ static int pcistub_seize(struct pci_dev *dev)
>   * other functions that take the sysfs lock. */
>  static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  {
> -	int err = 0;
> +	int err = 0, match;
> +	struct pcistub_device_id *pci_dev_id = NULL;
>  
>  	dev_dbg(&dev->dev, "probing...\n");
>  
> -	if (pcistub_match(dev)) {
> +	match = pcistub_match(dev);
> +
> +	if ((dev->driver_override &&
> +	     !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
> +	    match) {
>  
>  		if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
>  		    && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
> @@ -562,8 +576,16 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  			goto out;
>  		}
>  
> +		if (!match) {
> +			pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_ATOMIC);
> +			if (!pci_dev_id) {
> +				err = -ENOMEM;
> +				goto out;
> +			}
> +		}
> +
>  		dev_info(&dev->dev, "seizing device\n");
> -		err = pcistub_seize(dev);
> +		err = pcistub_seize(dev, pci_dev_id);
>  	} else
>  		/* Didn't find the device */
>  		err = -ENODEV;
> @@ -975,7 +997,7 @@ static const struct pci_error_handlers xen_pcibk_error_handler = {
>  static struct pci_driver xen_pcibk_pci_driver = {
>  	/* The name should be xen_pciback, but until the tools are updated
>  	 * we will keep it as pciback. */
> -	.name = "pciback",
> +	.name = PCISTUB_DRIVER_NAME,
>  	.id_table = pcistub_ids,
>  	.probe = pcistub_probe,
>  	.remove = pcistub_remove,

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#1489740 — Re: [PATCH v3 3/3] xen/pciback: support driver_override

On 22/09/16 23:10, Boris Ostrovsky wrote:
> On 09/22/2016 04:45 AM, Juergen Gross wrote:
>> Support the driver_override scheme introduced with commit 782a985d7af2
>> ("PCI: Introduce new device binding path using pci_dev.driver_override")
>>
>> As pcistub_probe() is called for all devices (it has to check for a
>> match based on the slot address rather than device type) it has to
>> check for driver_override set to "pciback" itself.
>>
>> Up to now for assigning a pci device to pciback you need something like:
>>
>> echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
>> echo 0000:07:10.0 > /sys/bus/pci/drivers/pciback/new_slot
>> echo 0000:07:10.0 > /sys/bus/pci/drivers_probe
>>
>> while with the patch you can use the same mechanism as for similar
>> drivers like pci-stub and vfio-pci:
>>
>> echo pciback > /sys/bus/pci/devices/0000\:07\:10.0/driver_override
>> echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
>> echo 0000:07:10.0 > /sys/bus/pci/drivers_probe
>>
>> So e.g. libvirt doesn't need special handling for pciback.
>>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>> ---
>> V3: Move override check up in order not to miss the PCI_HEADER_TYPE
>>     check.
>>     Add an assigned device to the slot list.
>>
>> V2: Removed now unused label
>> ---
>>  drivers/xen/xen-pciback/pci_stub.c | 36 +++++++++++++++++++++++++++++-------
>>  1 file changed, 29 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
>> index 0179333..6331a95 100644
>> --- a/drivers/xen/xen-pciback/pci_stub.c
>> +++ b/drivers/xen/xen-pciback/pci_stub.c
>> @@ -25,6 +25,8 @@
>>  #include "conf_space.h"
>>  #include "conf_space_quirks.h"
>>  
>> +#define PCISTUB_DRIVER_NAME "pciback"
>> +
>>  static char *pci_devs_to_hide;
>>  wait_queue_head_t xen_pcibk_aer_wait_queue;
>>  /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
>> @@ -508,15 +510,18 @@ static void pcistub_device_id_add_list(struct pcistub_device_id *new,
>>  		kfree(new);
>>  }
>>  
>> -static int pcistub_seize(struct pci_dev *dev)
>> +static int pcistub_seize(struct pci_dev *dev,
>> +			 struct pcistub_device_id *pci_dev_id)
>>  {
>>  	struct pcistub_device *psdev;
>>  	unsigned long flags;
>>  	int err = 0;
>>  
>>  	psdev = pcistub_device_alloc(dev);
>> -	if (!psdev)
>> +	if (!psdev) {
>> +		kfree(pci_dev_id);
> 
> Here too --- I'd rather have it freed by whoever allocated it (i.e. the
> caller). In fact I think you can allocate this here and instead of
> passing pci_dev_id pointer pass a flag of some sort.

Allocating it here will become nasty: The allocation flags are
different in the two cases, so I'd have to either pass the flags
or have to use GFP_ATOMIC in both cases.

And dealing with an allocation failure at the very end of
pcistub_seize() would require quite some rollback action.


Juergen

> -boris
> 
>>  		return -ENOMEM;
>> +	}
>>  
>>  	spin_lock_irqsave(&pcistub_devices_lock, flags);
>>  
>> @@ -537,8 +542,12 @@ static int pcistub_seize(struct pci_dev *dev)
>>  
>>  	spin_unlock_irqrestore(&pcistub_devices_lock, flags);
>>  
>> -	if (err)
>> +	if (err) {
>> +		kfree(pci_dev_id);
>>  		pcistub_device_put(psdev);
>> +	} else if (pci_dev_id)
>> +		pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
>> +					   dev->bus->number, dev->devfn);
>>  
>>  	return err;
>>  }
>> @@ -547,11 +556,16 @@ static int pcistub_seize(struct pci_dev *dev)
>>   * other functions that take the sysfs lock. */
>>  static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
>>  {
>> -	int err = 0;
>> +	int err = 0, match;
>> +	struct pcistub_device_id *pci_dev_id = NULL;
>>  
>>  	dev_dbg(&dev->dev, "probing...\n");
>>  
>> -	if (pcistub_match(dev)) {
>> +	match = pcistub_match(dev);
>> +
>> +	if ((dev->driver_override &&
>> +	     !strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
>> +	    match) {
>>  
>>  		if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
>>  		    && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
>> @@ -562,8 +576,16 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
>>  			goto out;
>>  		}
>>  
>> +		if (!match) {
>> +			pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_ATOMIC);
>> +			if (!pci_dev_id) {
>> +				err = -ENOMEM;
>> +				goto out;
>> +			}
>> +		}
>> +
>>  		dev_info(&dev->dev, "seizing device\n");
>> -		err = pcistub_seize(dev);
>> +		err = pcistub_seize(dev, pci_dev_id);
>>  	} else
>>  		/* Didn't find the device */
>>  		err = -ENODEV;
>> @@ -975,7 +997,7 @@ static const struct pci_error_handlers xen_pcibk_error_handler = {
>>  static struct pci_driver xen_pcibk_pci_driver = {
>>  	/* The name should be xen_pciback, but until the tools are updated
>>  	 * we will keep it as pciback. */
>> -	.name = "pciback",
>> +	.name = PCISTUB_DRIVER_NAME,
>>  	.id_table = pcistub_ids,
>>  	.probe = pcistub_probe,
>>  	.remove = pcistub_remove,
> 
> 
> 

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#1494158 — Re: [Xen-devel] [PATCH v3 0/3] xen/pciback: support driver_override

On 22/09/16 09:45, Juergen Gross wrote:
> Support the driver_override scheme introduced with commit 782a985d7af2
> ("PCI: Introduce new device binding path using pci_dev.driver_override")

Applied to for-linus-4.9, thanks.

David

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