Re: [PATCH v3 12/16] PCI/DOE: Create mailboxes on device enumeration

["Li, Ming" <ming4.li@intel.com>]

On 2/11/2023 4:25 AM, Lukas Wunner wrote:
> Currently a DOE instance cannot be shared by multiple drivers because
> each driver creates its own pci_doe_mb struct for a given DOE instance.
> For the same reason a DOE instance cannot be shared between the PCI core
> and a driver.
> 
> Overcome this limitation by creating mailboxes in the PCI core on device
> enumeration.
> 
> Provide a pci_find_doe_mailbox() API call to allow drivers to get a
> pci_doe_mb for a given (pci_dev, vendor, protocol) triple.  This API is
> modeled after pci_find_capability() and can later be amended with a
> pci_find_next_doe_mailbox() call to iterate over all mailboxes of a
> given pci_dev which support a specific protocol.
> 
> On removal, destroy the mailboxes in pci_destroy_dev(), after the driver
> is unbound.  This allows drivers to use DOE in their ->remove() hook.
> 
> On surprise removal, cancel ongoing DOE exchanges and prevent new ones
> from being scheduled.  Thereby ensure that a hot-removed device doesn't
> needlessly wait for a running exchange to time out.
> 
> Tested-by: Ira Weiny <ira.weiny@intel.com>
> Signed-off-by: Lukas Wunner <lukas@wunner.de>
> Reviewed-by: Ira Weiny <ira.weiny@intel.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Reviewed-by: Ming Li <ming4.li@intel.com>