linux-kernel - RE: [PATCH v5 0/4] PCI: Add support for PCI Enhanced Allocation "BARs"

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Date:	Wed, 7 Oct 2015 13:44:52 +0000
From:	"Stalley, Sean" <sean.stalley@...el.com>
To:	David Daney <ddaney.cavm@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rafal Milecki <zajec5@...il.com>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	"yinghai@...nel.org" <yinghai@...nel.org>,
	"rajatxjain@...il.com" <rajatxjain@...il.com>,
	"gong.chen@...ux.intel.com" <gong.chen@...ux.intel.com>
CC:	David Daney <david.daney@...ium.com>
Subject: RE: [PATCH v5 0/4] PCI: Add support for PCI Enhanced Allocation
 "BARs"

[PATCH 3/4 & 4/4] Acked-by: Sean O. Stalley <sean.stalley@...el.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@...il.com]
> Sent: Tuesday, October 06, 2015 4:51 PM
> To: linux-kernel@...r.kernel.org; linux-pci@...r.kernel.org; Bjorn Helgaas;
> Michael S. Tsirkin; Rafał Miłecki; linux-api@...r.kernel.org; Stalley, Sean;
> yinghai@...nel.org; rajatxjain@...il.com; gong.chen@...ux.intel.com
> Cc: David Daney
> Subject: [PATCH v5 0/4] PCI: Add support for PCI Enhanced Allocation
> "BARs"
> 
> From: David Daney <david.daney@...ium.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

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