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| author |   Alexandru Gagniuc <mr.nuke.me@gmail.com> | 2019-02-27 14:58:17 -0600 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2019-03-05 15:04:13 -0600 |
| commit | e8303bb7a75c113388badcc49b2a84b4121c1b3e (patch) | |
| tree | 191bc959359be088dc553e69b45d82c3d4a96ff9 /drivers/pci/pcie/portdrv.h | |
| parent | PCI/portdrv: Support PCIe services on subtractive decode bridges (diff) | |
| download | wireguard-linux-e8303bb7a75c113388badcc49b2a84b4121c1b3e.tar.xz wireguard-linux-e8303bb7a75c113388badcc49b2a84b4121c1b3e.zip | |
PCI/LINK: Report degraded links via link bandwidth notification
A warning is generated when a PCIe device is probed with a degraded link,
but there was no similar mechanism to warn when the link becomes degraded
after probing. The Link Bandwidth Notification provides this mechanism.
Use the Link Bandwidth Management Interrupt to detect bandwidth changes,
and rescan the bandwidth, looking for the weakest point. This is the same
logic used in probe().
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Diffstat (limited to 'drivers/pci/pcie/portdrv.h')
| -rw-r--r-- | drivers/pci/pcie/portdrv.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h index fbbf00b0992e..1d50dc58ac40 100644 --- a/drivers/pci/pcie/portdrv.h +++ b/drivers/pci/pcie/portdrv.h @@ -20,8 +20,10 @@ #define PCIE_PORT_SERVICE_HP (1 << PCIE_PORT_SERVICE_HP_SHIFT) #define PCIE_PORT_SERVICE_DPC_SHIFT 3 /* Downstream Port Containment */ #define PCIE_PORT_SERVICE_DPC (1 << PCIE_PORT_SERVICE_DPC_SHIFT) +#define PCIE_PORT_SERVICE_BWNOTIF_SHIFT 4 /* Bandwidth notification */ +#define PCIE_PORT_SERVICE_BWNOTIF (1 << PCIE_PORT_SERVICE_BWNOTIF_SHIFT) -#define PCIE_PORT_DEVICE_MAXSERVICES 4 +#define PCIE_PORT_DEVICE_MAXSERVICES 5 #ifdef CONFIG_PCIEAER int pcie_aer_init(void); @@ -47,6 +49,8 @@ int pcie_dpc_init(void); static inline int pcie_dpc_init(void) { return 0; } #endif +int pcie_bandwidth_notification_init(void); + /* Port Type */ #define PCIE_ANY_PORT (~0) |