diff mbox series

[v2,1/2] hwtracing: hisi_ptt: Only add the supported devices to the filters list

Message ID 20230110130833.53474-1-yangyicong@huawei.com
State New
Headers
Series [v2,1/2] hwtracing: hisi_ptt: Only add the supported devices to the filters list |

Commit Message

Yicong Yang Jan. 10, 2023, 1:08 p.m. UTC 
  From: Yicong Yang <yangyicong@hisilicon.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 add the checking when initialize 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@hisilicon.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@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(+)

Comments

Bjorn Helgaas Jan. 10, 2023, 3:05 p.m. UTC | #1 
On Tue, Jan 10, 2023 at 09:08:32PM +0800, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@hisilicon.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 add the checking when initialize the filters list.

"So check when initializing the filters list."
Yicong Yang Jan. 11, 2023, 6:52 a.m. UTC | #2 
Hi Bjorn,

On 2023/1/10 23:05, Bjorn Helgaas wrote:
> On Tue, Jan 10, 2023 at 09:08:32PM +0800, Yicong Yang wrote:
>> From: Yicong Yang <yangyicong@hisilicon.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 add the checking when initialize the filters list.
> 
> "So check when initializing the filters list."
> .

Thanks for the comment. Will reword this sentence as suggested.

Thanks.
diff mbox series

Patch

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