diff mbox

[v4,3/3] PCI: Use pdev->has_secondary_link to identify pcie link

Message ID 1432191904-16451-3-git-send-email-wangyijing@huawei.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Yijing Wang May 21, 2015, 7:05 a.m. UTC
We assumed pcie root port and downstream port always have
pcie link, but in some unusual pcie topology platform like
ATCA, it may has the following pcie tree:

root port ---- downstream port -----upstream port
                                   |
                                   |downstream port
Now we introduce a flag pdev->has_secondary_link to tag
a device whether has pcie link, use it instead.

Signed-off-by: Yijing Wang <wangyijing@huawei.com>
---
 drivers/pci/pcie/aer/aerdrv_core.c |    3 +--
 drivers/pci/probe.c                |    2 +-
 drivers/pci/vc.c                   |    3 +--
 3 files changed, 3 insertions(+), 5 deletions(-)

Comments

Bjorn Helgaas May 26, 2015, 11:58 p.m. UTC | #1
On Thu, May 21, 2015 at 03:05:04PM +0800, Yijing Wang wrote:
> We assumed pcie root port and downstream port always have
> pcie link, but in some unusual pcie topology platform like
> ATCA, it may has the following pcie tree:
> 
> root port ---- downstream port -----upstream port
>                                    |
>                                    |downstream port
> Now we introduce a flag pdev->has_secondary_link to tag
> a device whether has pcie link, use it instead.
> 
> Signed-off-by: Yijing Wang <wangyijing@huawei.com>

Applied to pci/aspm for v4.2, thanks!

> ---
>  drivers/pci/pcie/aer/aerdrv_core.c |    3 +--
>  drivers/pci/probe.c                |    2 +-
>  drivers/pci/vc.c                   |    3 +--
>  3 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
> index 5653ea9..9803e3d 100644
> --- a/drivers/pci/pcie/aer/aerdrv_core.c
> +++ b/drivers/pci/pcie/aer/aerdrv_core.c
> @@ -425,8 +425,7 @@ static pci_ers_result_t reset_link(struct pci_dev *dev)
>  
>  	if (driver && driver->reset_link) {
>  		status = driver->reset_link(udev);
> -	} else if (pci_pcie_type(udev) == PCI_EXP_TYPE_DOWNSTREAM ||
> -		pci_pcie_type(udev) == PCI_EXP_TYPE_ROOT_PORT) {
> +	} else if (udev->has_secondary_link) {
>  		status = default_reset_link(udev);
>  	} else {
>  		dev_printk(KERN_DEBUG, &dev->dev,
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 192c6b9..eba4928 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1645,7 +1645,7 @@ static int only_one_child(struct pci_bus *bus)
>  		return 0;
>  	if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
>  		return 1;
> -	if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
> +	if (parent->has_secondary_link &&
>  	    !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
>  		return 1;
>  	return 0;
> diff --git a/drivers/pci/vc.c b/drivers/pci/vc.c
> index 7e1304d..dfbab61 100644
> --- a/drivers/pci/vc.c
> +++ b/drivers/pci/vc.c
> @@ -108,8 +108,7 @@ static void pci_vc_enable(struct pci_dev *dev, int pos, int res)
>  	struct pci_dev *link = NULL;
>  
>  	/* Enable VCs from the downstream device */
> -	if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
> -	    pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM)
> +	if (!dev->has_secondary_link)
>  		return;
>  
>  	ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);
> -- 
> 1.7.1
> 
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diff mbox

Patch

diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 5653ea9..9803e3d 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -425,8 +425,7 @@  static pci_ers_result_t reset_link(struct pci_dev *dev)
 
 	if (driver && driver->reset_link) {
 		status = driver->reset_link(udev);
-	} else if (pci_pcie_type(udev) == PCI_EXP_TYPE_DOWNSTREAM ||
-		pci_pcie_type(udev) == PCI_EXP_TYPE_ROOT_PORT) {
+	} else if (udev->has_secondary_link) {
 		status = default_reset_link(udev);
 	} else {
 		dev_printk(KERN_DEBUG, &dev->dev,
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 192c6b9..eba4928 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1645,7 +1645,7 @@  static int only_one_child(struct pci_bus *bus)
 		return 0;
 	if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
 		return 1;
-	if (pci_pcie_type(parent) == PCI_EXP_TYPE_DOWNSTREAM &&
+	if (parent->has_secondary_link &&
 	    !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
 		return 1;
 	return 0;
diff --git a/drivers/pci/vc.c b/drivers/pci/vc.c
index 7e1304d..dfbab61 100644
--- a/drivers/pci/vc.c
+++ b/drivers/pci/vc.c
@@ -108,8 +108,7 @@  static void pci_vc_enable(struct pci_dev *dev, int pos, int res)
 	struct pci_dev *link = NULL;
 
 	/* Enable VCs from the downstream device */
-	if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
-	    pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM)
+	if (!dev->has_secondary_link)
 		return;
 
 	ctrl_pos = pos + PCI_VC_RES_CTRL + (res * PCI_CAP_VC_PER_VC_SIZEOF);