diff options
| -rw-r--r-- | share/man/man9/Makefile | 2 | ||||
| -rw-r--r-- | share/man/man9/pci.9 | 26 | ||||
| -rw-r--r-- | sys/dev/pci/pci.c | 19 | ||||
| -rw-r--r-- | sys/dev/pci/pcivar.h | 2 |
4 files changed, 49 insertions, 0 deletions
diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile index af2a216..81063b9 100644 --- a/share/man/man9/Makefile +++ b/share/man/man9/Makefile @@ -980,6 +980,8 @@ MLINKS+=pci.9 pci_disable_busmaster.9 \ pci.9 pci_find_device.9 \ pci.9 pci_get_powerstate.9 \ pci.9 pci_read_config.9 \ + pci.9 pci_restore_state.9 \ + pci.9 pci_save_state.9 \ pci.9 pci_set_powerstate.9 \ pci.9 pci_write_config.9 MLINKS+=pfil.9 pfil_add_hook.9 \ diff --git a/share/man/man9/pci.9 b/share/man/man9/pci.9 index d8ed624..93ea75e 100644 --- a/share/man/man9/pci.9 +++ b/share/man/man9/pci.9 @@ -38,6 +38,8 @@ .Nm pci_disable_io , .Nm pci_set_powerstate , .Nm pci_get_powerstate , +.Nm pci_save_state , +.Nm pci_restore_state , .Nm pci_find_bsf , .Nm pci_find_dbsf , .Nm pci_find_device @@ -63,6 +65,10 @@ .Fn pci_get_powerstate "device_t dev" .Ft uint32_t .Fn pci_read_config "device_t dev" "int reg" "int width" +.Ft void +.Fn pci_save_state "device_t dev" +.Ft void +.Fn pci_restore_state "device_t dev" .Ft device_t .Fn pci_find_bsf "uint8_t bus" "uint8_t slot" "uint8_t func" .Ft device_t @@ -188,6 +194,26 @@ of is set. .Pp The +.Fn pci_save_state +and +.Fn pci_restore_state +functions can be used by a device driver to save and restore standard PCI +config registers. +The +.Fn pci_save_state +function must be invoked while the device has valid state before +.Fn pci_restore_state +can be used. +If the device is not in the fully-powered state +.Pq Dv PCI_POWERSTATE_D0 +when +.Fn pci_restore_state +is invoked, +then the device will be transitioned to +.Dv PCI_POWERSTATE_D0 +before any config registers are restored. +.Pp +The .Fn pci_find_bsf function looks up the .Vt device_t diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c index 584c9c3..e62babb 100644 --- a/sys/dev/pci/pci.c +++ b/sys/dev/pci/pci.c @@ -4426,3 +4426,22 @@ pci_cfg_save(device_t dev, struct pci_devinfo *dinfo, int setstate) if (pci_get_powerstate(dev) != PCI_POWERSTATE_D3) pci_set_powerstate(dev, PCI_POWERSTATE_D3); } + +/* Wrapper APIs suitable for device driver use. */ +void +pci_save_state(device_t dev) +{ + struct pci_devinfo *dinfo; + + dinfo = device_get_ivars(dev); + pci_cfg_save(dev, dinfo, 0); +} + +void +pci_restore_state(device_t dev) +{ + struct pci_devinfo *dinfo; + + dinfo = device_get_ivars(dev); + pci_cfg_restore(dev, dinfo); +} diff --git a/sys/dev/pci/pcivar.h b/sys/dev/pci/pcivar.h index 8fd84a7..87abeba 100644 --- a/sys/dev/pci/pcivar.h +++ b/sys/dev/pci/pcivar.h @@ -467,6 +467,8 @@ int pci_msi_device_blacklisted(device_t dev); void pci_ht_map_msi(device_t dev, uint64_t addr); int pci_get_max_read_req(device_t dev); +void pci_restore_state(device_t dev); +void pci_save_state(device_t dev); int pci_set_max_read_req(device_t dev, int size); #endif /* _SYS_BUS_H_ */ |
