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

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Date:   Mon, 28 Jan 2019 10:31:03 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Alan Douglas <adouglas@...ence.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>,
        Jia-Ju Bai <baijiaju1990@...il.com>,
        <linux-omap@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 00/15] PCI: endpoint: Cleanup EPC features

Hi,

On 24/01/19 8:22 PM, Lorenzo Pieralisi wrote:
> On Mon, Jan 07, 2019 at 12:11:33PM +0530, 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.
>>
>> Tested on TI's DRA7xx platform.
> 
> Hi Kishon,
> 
> I have no major objections to this series but I would like to see some
> testing done in EP mode (on test platforms other than DRA7XX) to make
> sure it does not break anything.
> 
> Please do help Kishon get some testing done.

Please test v2 of this series please [1]

[1] -> https://www.spinics.net/lists/arm-kernel/msg699787.html

Thanks
Kishon

> 
> Thanks,
> Lorenzo
> 
>> Thanks
>> Kishon
>>
>> 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 | 80 ++++++++++---------
>>  drivers/pci/endpoint/pci-epc-core.c           | 52 ++++++++++++
>>  drivers/pci/endpoint/pci-epf-core.c           |  3 +
>>  include/linux/pci-epc.h                       | 30 +++++--
>>  10 files changed, 185 insertions(+), 64 deletions(-)
>>
>> -- 
>> 2.17.1
>>