Re: [PATCH v5 0/4] PCI: Add support for PCI Enhanced Allocation "BARs"

[David Daney <ddaney@caviumnetworks.com>]

On 10/14/2015 09:17 AM, Sean O. Stalley wrote:
> Signed-off-by: Sean O. Stalley <sean.stalley@intel.com>
>

Thanks a lot Sean.

I think you cannot SOB if the patches are not flowing through you (as 
may be the case for my two additions).  Perhaps a Tested-by: or 
Acked-by: would be more appropriate.

> I tested it out with the QEMU EA Patches here:
> 	[https://lists.nongnu.org/archive/html/qemu-devel/2015-07/msg00348.html]
>
> Also, I found 1 trivial typo in the commit message of PATCH 1/4:
> 	"Signed-off-by: Signed-off-by: David Daney <david.daney@cavium.com>"

Aargh!  I need to be more careful.

In any case, what should be the next course of action?

   A) I receive Tested-by/Acked-by from Sean, and resend the four patches?

   B) Bjorn takes these as is, but fixes the headers as needed.

Bjorn, what do you think?

Thanks,
David Daney


>
> -Sean
>
> On Wed, Oct 07, 2015 at 06:44:52AM -0700, Stalley, Sean wrote:
>> [PATCH 3/4 & 4/4] Acked-by: Sean O. Stalley <sean.stalley@intel.com>
>>
>> I won't be able to test it out until next week, but I like how it looks :)
>>
>> Thanks Again,
>> Sean
>>
>>> -----Original Message-----
>>> From: David Daney [mailto:ddaney.cavm@gmail.com]
>>> Sent: Tuesday, October 06, 2015 4:51 PM
>>> To: linux-kernel@vger.kernel.org; linux-pci@vger.kernel.org; Bjorn Helgaas;
>>> Michael S. Tsirkin; Rafał Miłecki; linux-api@vger.kernel.org; Stalley, Sean;
>>> yinghai@kernel.org; rajatxjain@gmail.com; gong.chen@linux.intel.com
>>> Cc: David Daney
>>> Subject: [PATCH v5 0/4] PCI: Add support for PCI Enhanced Allocation
>>> "BARs"
>>>
>>> From: David Daney <david.daney@cavium.com>
>>>
>>> The original patches are from Sean O. Stalley. I made a few tweaks, but feel
>>> that it is substancially Sean's work, so I am keeping the patch set version
>>> numbering scheme going.
>>>
>>> Tested on Cavium ThunderX system with 4 Root Complexes containing 50
>>> devices/bridges provisioned with EA.
>>>
>>> Here is Sean's description of the patches:
>>>
>>> PCI Enhanced Allocation is a new method of allocating MMIO & IO
>>> resources for PCI devices & bridges. It can be used instead of the traditional
>>> PCI method of using BARs.
>>>
>>> EA entries are hardware-initialized to a fixed address.
>>> Unlike BARs, regions described by EA are cannot be moved.
>>> Because of this, only devices which are permanently connected to the PCI
>>> bus can use EA. A removable PCI card must not use EA.
>>>
>>> This patchset adds support for using EA entries instead of BARs on Root
>>> Complex Integrated Endpoints.
>>>
>>> The Enhanced Allocation ECN is publicly available here:
>>> https://www.pcisig.com/specifications/conventional/ECN_Enhanced_Alloca
>>> tion_23_Oct_2014_Final.pdf
>>>
>>>
>>> Changes from V1:
>>> 	- Use generic PCI resource claim functions (instead of EA-specific
>>> functions)
>>> 	- Only add support for RCiEPs (instead of all devices).
>>> 	- Removed some debugging messages leftover from early testing.
>>>
>>> Changes from V2 (By David Daney):
>>> 	- Add ea_cap to struct pci_device, to aid in finding the EA capability.
>>> 	- Factored EA entity decoding into a separate function.
>>> 	- Add functions to find EA entities by BEI or Property.
>>> 	- Add handling of EA provisioned bridges.
>>> 	- Add handling of EA SRIOV BARs.
>>> 	- Try to assign proper resource parent so that SRIOV device creation
>>> can occur.
>>>
>>> Changes from V3 (By David Daney):
>>> 	- Discarded V3 changes and started over fresh based on Sean's V2.
>>> 	- Add more support/checking for Entry Properties.
>>> 	- Allow EA behind bridges.
>>> 	- Rewrite some error messages.
>>> 	- Add patch 3/5 to prevent resizing, and better handle
>>>            assigning, of fixed EA resources.
>>> 	- Add patch 4/5 to handle EA provisioned SRIOV devices.
>>> 	- Add patch 5/5 to handle EA provisioned bridges.
>>>
>>> Changes from V4 (By David Daney):
>>> 	- Drop patch 5/5 to handle EA provisioned bridges.
>>> 	- Drop cases for bridge resources in 2/5.
>>> 	- Drop unnecessary fallback resource parent handling in 3/5
>>> 	- Small code formatting improvements.
>>>
>>> David Daney (2):
>>>    PCI: Handle IORESOURCE_PCI_FIXED when sizing and assigning resources.
>>>    PCI: Handle Enhanced Allocation (EA) capability for SRIOV devices.
>>>
>>> Sean O. Stalley (2):
>>>    PCI: Add Enhanced Allocation register entries
>>>    PCI: Add support for Enhanced Allocation devices
>>>
>>>   drivers/pci/iov.c             |  11 ++-
>>>   drivers/pci/pci.c             | 189
>>> ++++++++++++++++++++++++++++++++++++++++++
>>>   drivers/pci/pci.h             |   1 +
>>>   drivers/pci/probe.c           |   3 +
>>>   drivers/pci/setup-bus.c       |  50 ++++++++++-
>>>   include/uapi/linux/pci_regs.h |  44 +++++++++-
>>>   6 files changed, 292 insertions(+), 6 deletions(-)
>>>
>>> --
>>> 1.9.1
>>