linux-kernel - Re: [PATCH v9 00/12] Add MSI-X support on pcitest tool

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Date:   Mon, 16 Jul 2018 09:37:34 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Gustavo Pimentel <Gustavo.Pimentel@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "adouglas@...ence.com" <adouglas@...ence.com>,
        "jesper.nilsson@...s.com" <jesper.nilsson@...s.com>,
        "shawn.lin@...k-chips.com" <shawn.lin@...k-chips.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 00/12] Add MSI-X support on pcitest tool

Hi,

On Friday 13 July 2018 09:29 PM, Gustavo Pimentel wrote:
> Hi Lorenzo,
> 
> On 13/07/2018 14:25, Lorenzo Pieralisi wrote:
>> On Mon, Jul 09, 2018 at 06:42:38PM +0100, Gustavo Pimentel wrote:
>>> Patch series made against Lorenzo's master branch.
>>>
>>> Fix EP link notification implementation.
>>>
>>> Add MSI-X support on pcitest tool.
>>>
>>> Add new callbacks methods and handlers to trigger the MSI-X interrupts
>>> on the EP DesignWare IP driver.
>>>
>>> Allow to set/get MSI-X EP maximum capability number.
>>>
>>> Rework on set/get and triggering MSI methods on EP DesignWare IP driver.
>>>
>>> Add a new input parameter (msix) to pcitest tool to test MSI-X feature.
>>>
>>> Update the pcitest.sh script to support MSI-X feature tests.
>>>
>>> Gustavo Pimentel (12):
>>>   PCI: dwc: Fix EP link notification implementation
>>>   PCI: endpoint: Add MSI-X interfaces
>>>   PCI: Update xxx_pcie_ep_raise_irq() and pci_epc_raise_irq() signatures
>>>   PCI: dwc: Add MSI-X callbacks handler
>>>   PCI: dwc: Rework MSI callbacks handler
>>>   PCI: dwc: Add legacy interrupt callback handler
>>>   pci-epf-test/pci_endpoint_test: Cleanup PCI_ENDPOINT_TEST memspace
>>>   pci-epf-test/pci_endpoint_test: Use irq_type module parameter
>>>   pci-epf-test/pci_endpoint_test: Add MSI-X support
>>>   pci_endpoint_test: Add 2 ioctl commands
>>>   tools: PCI: Add MSI-X support
>>>   PCI: endpoint: Add MSI set maximum restriction
>>>
>>>  Documentation/PCI/endpoint/pci-test-function.txt  |   8 +-
>>>  Documentation/ioctl/ioctl-number.txt              |   1 +
>>>  Documentation/misc-devices/pci-endpoint-test.txt  |   6 +
>>>  drivers/misc/pci_endpoint_test.c                  | 260 ++++++++++++++++------
>>>  drivers/pci/controller/dwc/pci-dra7xx.c           |   2 +-
>>>  drivers/pci/controller/dwc/pcie-artpec6.c         |   2 +-
>>>  drivers/pci/controller/dwc/pcie-designware-ep.c   | 217 ++++++++++++++++--
>>>  drivers/pci/controller/dwc/pcie-designware-plat.c |  11 +-
>>>  drivers/pci/controller/dwc/pcie-designware.h      |  31 ++-
>>>  drivers/pci/controller/pcie-cadence-ep.c          |   3 +-
>>>  drivers/pci/controller/pcie-rockchip-ep.c         |   2 +-
>>>  drivers/pci/endpoint/functions/pci-epf-test.c     |  86 +++++--
>>>  drivers/pci/endpoint/pci-ep-cfs.c                 |  24 ++
>>>  drivers/pci/endpoint/pci-epc-core.c               |  68 +++++-
>>>  include/linux/pci-epc.h                           |  16 +-
>>>  include/linux/pci-epf.h                           |   1 +
>>>  include/uapi/linux/pcitest.h                      |   3 +
>>>  tools/pci/pcitest.c                               |  51 ++++-
>>>  tools/pci/pcitest.sh                              |  15 ++
>>>  19 files changed, 664 insertions(+), 143 deletions(-)
>>
>> Gustavo, Kishon,
>>
>> it seems like this series has been thoroughly reviewed and it is
>> ready to go, please let me know if there is any pending change.
> 
> I just sent the patch # 10 based on Kishon's latest review.
> For me it's nearly perfect. :)

I got to test this series today and I found one issue.

use this sequence:
1) pcitest -i 2 /* change to MSIX irq type */
   For platforms that doesn't support MSIX, get the following message
   pci-endpoint-test 0000:01:00.0: Failed to get MSI-X interrupts
   SET IRQ TYPE TO MSI-X:          NOT OKAY

   However after this, pci_endpoint_test_set_irq() will invoke
   pci_endpoint_test_free_irq_vectors() and pci_endpoint_test_release_irq().
   This will free previously allocated MSI irq vectors.

2) pcitest -i 1 /* change to MSI irq type */

   This will not invoke pci_endpoint_test_alloc_irq_vectors() and
   pci_endpoint_test_request_irq() since now "if (irq_type == req_irq_type)"
   will return true.

   After this MSI tests will fail.

Other than this failing sequence, the series looks good to me.

Thanks
Kishon