diff mbox series

[next-queue,v4,2/4] PCI: Add pcie_ptm_enabled()

Message ID 20210604220933.3974558-3-vinicius.gomes@intel.com (mailing list archive)
State Superseded
Headers show
Series igc: Add support for PCIe PTM | expand

Commit Message

Vinicius Costa Gomes June 4, 2021, 10:09 p.m. UTC
Adds a predicate that returns if PCIe PTM (Precision Time Measurement)
is enabled.

It will only return true if it's enabled in all the ports in the path
from the device to the root.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
---
 drivers/pci/pcie/ptm.c | 9 +++++++++
 include/linux/pci.h    | 3 +++
 2 files changed, 12 insertions(+)

Comments

Bjorn Helgaas June 4, 2021, 10:27 p.m. UTC | #1
On Fri, Jun 04, 2021 at 03:09:31PM -0700, Vinicius Costa Gomes wrote:
> Adds a predicate that returns if PCIe PTM (Precision Time Measurement)
> is enabled.

Ideally, "Add a predicate ..."

> It will only return true if it's enabled in all the ports in the path
> from the device to the root.
> 
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>

But either way,

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
>  drivers/pci/pcie/ptm.c | 9 +++++++++
>  include/linux/pci.h    | 3 +++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
> index 95d4eef2c9e8..8a4ad974c5ac 100644
> --- a/drivers/pci/pcie/ptm.c
> +++ b/drivers/pci/pcie/ptm.c
> @@ -204,3 +204,12 @@ int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
>  	return 0;
>  }
>  EXPORT_SYMBOL(pci_enable_ptm);
> +
> +bool pcie_ptm_enabled(struct pci_dev *dev)
> +{
> +	if (!dev)
> +		return false;
> +
> +	return dev->ptm_enabled;
> +}
> +EXPORT_SYMBOL(pcie_ptm_enabled);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index a687dda262dd..fe7f264b2b15 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1619,9 +1619,12 @@ bool pci_ats_disabled(void);
>  
>  #ifdef CONFIG_PCIE_PTM
>  int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
> +bool pcie_ptm_enabled(struct pci_dev *dev);
>  #else
>  static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
>  { return -EINVAL; }
> +static inline bool pcie_ptm_enabled(struct pci_dev *dev)
> +{ return false; }
>  #endif
>  
>  void pci_cfg_access_lock(struct pci_dev *dev);
> -- 
> 2.31.1
>
diff mbox series

Patch

diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
index 95d4eef2c9e8..8a4ad974c5ac 100644
--- a/drivers/pci/pcie/ptm.c
+++ b/drivers/pci/pcie/ptm.c
@@ -204,3 +204,12 @@  int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
 	return 0;
 }
 EXPORT_SYMBOL(pci_enable_ptm);
+
+bool pcie_ptm_enabled(struct pci_dev *dev)
+{
+	if (!dev)
+		return false;
+
+	return dev->ptm_enabled;
+}
+EXPORT_SYMBOL(pcie_ptm_enabled);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index a687dda262dd..fe7f264b2b15 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1619,9 +1619,12 @@  bool pci_ats_disabled(void);
 
 #ifdef CONFIG_PCIE_PTM
 int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
+bool pcie_ptm_enabled(struct pci_dev *dev);
 #else
 static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
 { return -EINVAL; }
+static inline bool pcie_ptm_enabled(struct pci_dev *dev)
+{ return false; }
 #endif
 
 void pci_cfg_access_lock(struct pci_dev *dev);