[Intel-wired-lan] [PATCH 5.10 1/2] commit 1d71eb53e451 ("Revert "PCI: Make pci_enable_ptm() private"")

[Intel-wired-lan] [PATCH 5.10 1/2] commit 1d71eb53e451 ("Revert "PCI: Make pci_enable_ptm() private"")

[Meng Tang]

From: Vinicius Costa Gomes <vinicius.gomes@intel.com>

Make pci_enable_ptm() accessible from the drivers.

Exposing this to the driver enables the driver to use the
'ptm_enabled' field of 'pci_dev' to check if PTM is enabled or not.

This reverts commit ac6c26da29c1 ("PCI: Make pci_enable_ptm() private").

In the 5.10 kernel version, even to the latest confirmed version,
the following error will still be reported when I225-V network card
is used.

kernel: [    1.031581] igc: probe of 0000:01:00.0 failed with error -2
kernel: [    1.066574] igc: probe of 0000:02:00.0 failed with error -2
kernel: [    1.096152] igc: probe of 0000:03:00.0 failed with error -2
kernel: [    1.127251] igc: probe of 0000:04:00.0 failed with error -2

Even though I confirmed that 7c496de538eebd8212dc2a3c9a468386b2640d4
and 47bca7de6a4fb8dcb564c7ca4d885c91ed19e03 have been merged into the
kernel 5.10, the bug is still occurred, and the
"commit 1b5d73fb8624 ("igc: Enable PCIe PTM")" can fixes it.

And this patch is the pre-patch of
1b5d73fb862414106cf270a1a7300ce8ae77de83.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Meng Tang <tangmeng@uniontech.com>
---
 drivers/pci/pci.h   | 3 ---
 include/linux/pci.h | 7 +++++++
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index a96dc6f53076..4084764bf0b1 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -585,11 +585,8 @@ static inline void pcie_ecrc_get_policy(char *str) { }
 
 #ifdef CONFIG_PCIE_PTM
 void pci_ptm_init(struct pci_dev *dev);
-int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
 #else
 static inline void pci_ptm_init(struct pci_dev *dev) { }
-static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
-{ return -EINVAL; }
 #endif
 
 struct pci_dev_reset_methods {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index bc5a1150f072..692ce678c5f1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1599,6 +1599,13 @@ static inline bool pci_aer_available(void) { return false; }
 
 bool pci_ats_disabled(void);
 
+#ifdef CONFIG_PCIE_PTM
+int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
+#else
+static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
+{ return -EINVAL; }
+#endif
+
 void pci_cfg_access_lock(struct pci_dev *dev);
 bool pci_cfg_access_trylock(struct pci_dev *dev);
 void pci_cfg_access_unlock(struct pci_dev *dev);
-- 
2.20.1



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[Intel-wired-lan] [PATCH 5.10 2/2] commit 1b5d73fb8624 ("igc: Enable PCIe PTM")

[Meng Tang]

In the 5.10 kernel version, even to the latest confirmed version,
the following error will still be reported when I225-V network card
is used.

kernel: [    1.031581] igc: probe of 0000:01:00.0 failed with error -2
kernel: [    1.066574] igc: probe of 0000:02:00.0 failed with error -2
kernel: [    1.096152] igc: probe of 0000:03:00.0 failed with error -2
kernel: [    1.127251] igc: probe of 0000:04:00.0 failed with error -2

Even though I confirmed that 7c496de538eebd8212dc2a3c9a468386b2640d4
and 47bca7de6a4fb8dcb564c7ca4d885c91ed19e03 have been merged into the
kernel 5.10, but bug still occurred, and this patch can fixes it.

Enables PCIe PTM (Precision Time Measurement) support in the igc
driver. Notifies the PCI devices that PCIe PTM should be enabled.

PCIe PTM is similar protocol to PTP (Precision Time Protocol) running
in the PCIe fabric, it allows devices to report time measurements from
their internal clocks and the correlation with the PCIe root clock.

The i225 NIC exposes some registers that expose those time
measurements, those registers will be used, in later patches, to
implement the PTP_SYS_OFFSET_PRECISE ioctl().

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Meng Tang <tangmeng@uniontech.com>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index fd9257c7059a..298e968629db 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -10,6 +10,7 @@
 #include <linux/ip.h>
 #include <linux/pm_runtime.h>
 #include <net/pkt_sched.h>
+#include <linux/pci.h>
 
 #include <net/ipv6.h>
 
@@ -5041,6 +5042,10 @@ static int igc_probe(struct pci_dev *pdev,
 
 	pci_enable_pcie_error_reporting(pdev);
 
+	err = pci_enable_ptm(pdev, NULL);
+	if (err < 0)
+		dev_info(&pdev->dev, "PCIe PTM not supported by PCIe bus/controller\n");
+
 	pci_set_master(pdev);
 
 	err = -ENOMEM;
-- 
2.20.1



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Re: [Intel-wired-lan] [PATCH 5.10 1/2] commit 1d71eb53e451 ("Revert "PCI: Make pci_enable_ptm() private"")

[Bjorn Helgaas]

On Mon, Jun 13, 2022 at 07:19:06PM +0800, Meng Tang wrote:
> From: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> 
> Make pci_enable_ptm() accessible from the drivers.
> 
> Exposing this to the driver enables the driver to use the
> 'ptm_enabled' field of 'pci_dev' to check if PTM is enabled or not.
> 
> This reverts commit ac6c26da29c1 ("PCI: Make pci_enable_ptm() private").
> 
> In the 5.10 kernel version, even to the latest confirmed version,
> the following error will still be reported when I225-V network card
> is used.
> 
> kernel: [    1.031581] igc: probe of 0000:01:00.0 failed with error -2
> kernel: [    1.066574] igc: probe of 0000:02:00.0 failed with error -2
> kernel: [    1.096152] igc: probe of 0000:03:00.0 failed with error -2
> kernel: [    1.127251] igc: probe of 0000:04:00.0 failed with error -2
> 
> Even though I confirmed that 7c496de538eebd8212dc2a3c9a468386b2640d4
> and 47bca7de6a4fb8dcb564c7ca4d885c91ed19e03 have been merged into the
> kernel 5.10, the bug is still occurred, and the
> "commit 1b5d73fb8624 ("igc: Enable PCIe PTM")" can fixes it.
> 
> And this patch is the pre-patch of
> 1b5d73fb862414106cf270a1a7300ce8ae77de83.

I guess the point of this is to backport 1d71eb53e451 ("Revert "PCI:
Make pci_enable_ptm() private"") to a v5.10 stable kernel?

If so, I would think you'd want to send this to
stable@vger.kernel.org.

> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> Signed-off-by: Meng Tang <tangmeng@uniontech.com>
> ---
>  drivers/pci/pci.h   | 3 ---
>  include/linux/pci.h | 7 +++++++
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index a96dc6f53076..4084764bf0b1 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -585,11 +585,8 @@ static inline void pcie_ecrc_get_policy(char *str) { }
>  
>  #ifdef CONFIG_PCIE_PTM
>  void pci_ptm_init(struct pci_dev *dev);
> -int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
>  #else
>  static inline void pci_ptm_init(struct pci_dev *dev) { }
> -static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
> -{ return -EINVAL; }
>  #endif
>  
>  struct pci_dev_reset_methods {
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index bc5a1150f072..692ce678c5f1 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1599,6 +1599,13 @@ static inline bool pci_aer_available(void) { return false; }
>  
>  bool pci_ats_disabled(void);
>  
> +#ifdef CONFIG_PCIE_PTM
> +int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
> +#else
> +static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
> +{ return -EINVAL; }
> +#endif
> +
>  void pci_cfg_access_lock(struct pci_dev *dev);
>  bool pci_cfg_access_trylock(struct pci_dev *dev);
>  void pci_cfg_access_unlock(struct pci_dev *dev);
> -- 
> 2.20.1
> 
> 
> 
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