linux-kernel - Re: [PATCH v2 00/15] PCI: endpoint: Cleanup EPC features

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Date:   Mon, 11 Feb 2019 10:19:47 +0000
From:   Gustavo Pimentel <gustavo.pimentel@...opsys.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Alan Douglas <adouglas@...ence.com>,
        "Shawn Lin" <shawn.lin@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 00/15] PCI: endpoint: Cleanup EPC features

Hi,

On 14/01/2019 11:14, Kishon Vijay Abraham I wrote:
> Hi Lorenzo,
> 
> The Endpoint controller driver uses features member in 'struct pci_epc'
> to advertise the list of supported features to the endpoint function
> driver.
> 
> There are a few shortcomings with this approach.
>   *) Certain endpoint controllers support fixed size BAR (e.g. TI's
>      AM654 uses Designware configuration with fixed size BAR). The
>      size of each BARs cannot be passed to the endpoint function
>      driver.
>   *) Too many macros for handling EPC features.
>      (EPC_FEATURE_NO_LINKUP_NOTIFIER, EPC_FEATURE_BAR_MASK,
>       EPC_FEATURE_MSIX_AVAILABLE, EPC_FEATURE_SET_BAR,
>       EPC_FEATURE_GET_BAR)
>   *) Endpoint controllers are directly modifying struct pci_epc
>      members. (I have plans to move struct pci_epc to
>      drivers/pci/endpoint so that pci_epc members are referenced
>      only by endpoint core).
> 
> To overcome the above shortcomings, introduced pci_epc_get_features()
> API, pci_epc_features structure and a ->get_features() callback.
> 
> Also added a patch to set BAR flags in pci_epf_alloc_space and
> remove it from pci-epf-test function driver.
> 
> Changes from v1:
> *) Fixed helper function to return '0' (or BAR_0) for any incorrect
>    values in reserved BAR.
> *) Do not set_bar or alloc space for BARs if the BARs are reserved
> *) Fix incorrect check of epc_features in pci_epf_test_bind
> 
> Tested on TI's DRA7xx platform and AM654 platform. Support for PCIe
> in AM654 platform will be posted shortly.
> 
> Kishon Vijay Abraham I (15):
>   PCI: endpoint: Add new pci_epc_ops to get EPC features
>   PCI: dwc: Add ->get_features() callback function in dw_pcie_ep_ops
>   PCI: designware-plat: Populate ->get_features() dw_pcie_ep_ops
>   PCI: pci-dra7xx: Populate ->get_features() dw_pcie_ep_ops
>   PCI: rockchip: Populate ->get_features() dw_pcie_ep_ops
>   PCI: cadence: Populate ->get_features() cdns_pcie_epc_ops
>   PCI: endpoint: Add helper to get first unreserved BAR
>   PCI: endpoint: Fix pci_epf_alloc_space to set correct MEM TYPE flags
>   PCI: pci-epf-test: Remove setting epf_bar flags in function driver
>   PCI: pci-epf-test: Do not allocate next BARs memory if current BAR is
>     64Bit
>   PCI: pci-epf-test: Use pci_epc_get_features to get EPC features
>   PCI: cadence: Remove pci_epf_linkup from Cadence EP driver
>   PCI: rockchip: Remove pci_epf_linkup from Rockchip EP driver
>   PCI: designware-plat: Remove setting epc->features in Designware plat
>     EP driver
>   PCI: endpoint: Remove features member in struct pci_epc
> 
>  drivers/pci/controller/dwc/pci-dra7xx.c       | 13 +++
>  .../pci/controller/dwc/pcie-designware-ep.c   | 12 +++
>  .../pci/controller/dwc/pcie-designware-plat.c | 17 +++-
>  drivers/pci/controller/dwc/pcie-designware.h  |  1 +
>  drivers/pci/controller/pcie-cadence-ep.c      | 25 ++---
>  drivers/pci/controller/pcie-rockchip-ep.c     | 16 +++-
>  drivers/pci/endpoint/functions/pci-epf-test.c | 93 ++++++++++++-------
>  drivers/pci/endpoint/pci-epc-core.c           | 53 +++++++++++
>  drivers/pci/endpoint/pci-epf-core.c           |  4 +-
>  include/linux/pci-epc.h                       | 31 +++++--
>  10 files changed, 201 insertions(+), 64 deletions(-)
> 

Sorry for the delay, I had a problem with my setup.

Tested-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>