linux-kernel - Re: [PATCH v3 1/2] hwtracing: hisi_ptt: Only add the supported devices to the filters list

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Message-ID: <252ff08d-55ed-b733-6b66-4ea40f07e501@huawei.com>
Date:   Thu, 19 Jan 2023 17:10:30 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     <suzuki.poulose@....com>
CC:     <mathieu.poirier@...aro.org>, <jonathan.cameron@...wei.com>,
        <yangyicong@...ilicon.com>, <alexander.shishkin@...ux.intel.com>,
        <helgaas@...nel.org>, <linux-pci@...r.kernel.org>,
        <prime.zeng@...wei.com>, <linuxarm@...wei.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/2] hwtracing: hisi_ptt: Only add the supported
 devices to the filters list

Hi Suzuki,

Any comments or is it ok to pick these two patches?
Hope to not miss this cycle since there's one fix :)

Thanks,
Yicong

On 2023/1/12 19:22, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@...ilicon.com>
> 
> The PTT device can only support the devices on the same PCIe core,
> within BDF range [lower_bdf, upper_bdf]. It's not correct to assume
> the devices on the root bus are from the same PCIe core, there are
> cases that root ports from different PCIe core are sharing the same
> bus. So check when initializing the filters list.
> 
> Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device")
> Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---
> Change since v2:
> - Refine the commit per Bjorn
> Link: https://lore.kernel.org/linux-pci/20230110130833.53474-1-yangyicong@huawei.com/
> 
> Change since v1:
> - Add tags from Jonathan
> Link: https://lore.kernel.org/linux-pci/20221122120209.25682-1-yangyicong@huawei.com/raw
> 
>  drivers/hwtracing/ptt/hisi_ptt.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
> index 5d5526aa60c4..30f1525639b5 100644
> --- a/drivers/hwtracing/ptt/hisi_ptt.c
> +++ b/drivers/hwtracing/ptt/hisi_ptt.c
> @@ -356,8 +356,18 @@ static int hisi_ptt_register_irq(struct hisi_ptt *hisi_ptt)
>  
>  static int hisi_ptt_init_filters(struct pci_dev *pdev, void *data)
>  {
> +	struct pci_dev *root_port = pcie_find_root_port(pdev);
>  	struct hisi_ptt_filter_desc *filter;
>  	struct hisi_ptt *hisi_ptt = data;
> +	u32 port_devid;
> +
> +	if (!root_port)
> +		return 0;
> +
> +	port_devid = PCI_DEVID(root_port->bus->number, root_port->devfn);
> +	if (port_devid < hisi_ptt->lower_bdf ||
> +	    port_devid > hisi_ptt->upper_bdf)
> +		return 0;
>  
>  	/*
>  	 * We won't fail the probe if filter allocation failed here. The filters
>