linux-kernel - Re: [PATCH] PCI: pci-hyperv: Retry PCI bus D0 entry when the first attempt failed with invalid device state 0xC0000184.

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Message-ID: <20200427102102.lar6d4w3rqz3d3j4@liuwe-devbox-debian-v2.j3c5onc20sse1dnehy4noqpfcg.zx.internal.cloudapp.net>
Date:   Mon, 27 Apr 2020 10:21:02 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Wei Hu <weh@...rosoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, lorenzo.pieralisi@....com, robh@...nel.org,
        bhelgaas@...gle.com, linux-hyperv@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        decui@...rosoft.com, mikelley@...rosoft.com
Subject: Re: [PATCH] PCI: pci-hyperv: Retry PCI bus D0 entry when the first
 attempt failed with invalid device state 0xC0000184.

On Sun, Apr 26, 2020 at 09:24:30PM +0800, Wei Hu wrote:
> In the case of kdump, the PCI device was not cleanly shut down
> before the kdump kernel starts. This causes the initial
> attempt of entering D0 state in the kdump kernel to fail with
> invalid device state 0xC0000184 returned from Hyper-V host.
> When this happens, explicitly call PCI bus exit and retry to
> enter the D0 state.
> 
> Also fix the PCI probe failure path to release the PCI device
> resource properly.
> 
> Signed-off-by: Wei Hu <weh@...rosoft.com>
> ---
>  drivers/pci/controller/pci-hyperv.c | 34 ++++++++++++++++++++++++++++-
>  1 file changed, 33 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index e15022ff63e3..eb4781fa058d 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -2736,6 +2736,10 @@ static void hv_free_config_window(struct hv_pcibus_device *hbus)
>  	vmbus_free_mmio(hbus->mem_config->start, PCI_CONFIG_MMIO_LENGTH);
>  }
>  
> +#define STATUS_INVALID_DEVICE_STATE		0xC0000184
> +

Can you please move this along side STATUS_REVISION_MISMATCH?

Wei.