pci_save_config_regs(9F) Kernel Functions for Drivers pci_save_config_regs(9F)NAME
pci_save_config_regs, pci_restore_config_regs - save and restore the
PCI configuration registers
SYNOPSIS
#include <sys/ddi.h>
#include <sys/sunddi.h>
int pci_save_config_regs(dev_info_t *dip);
int pci_restore_config_regs(dev_info_t *dip);
INTERFACE LEVEL
Solaris DDI-specific (Solaris DDI).
ARGUMENTS
dip
Pointer to the device's dev_info structure.
DESCRIPTIONpci_save_config_regs() saves the current configuration registers on
persistent system memory. pci_restore_config_regs() restores configura‐
tion registers previously saved by pci_save_config_regs().
pci_save_config_regs() should be called by the driver's power() entry
point before powering a device off (to PCI state D3). Likewise,
pci_restore_config_regs() should be called after powering a device on
(from PCI state D3), but before accessing the device. See power(9E).
RETURN VALUESpci_save_config_regs() and pci_restore_config_regs() return:
DDI_SUCCESS
Operation completed successfully.
DDI_FAILURE
Operation failed to complete successfully.
CONTEXT
Both these functions can be called from user or kernel context.
EXAMPLES
Example 1: Invoking the save and restore functions
static int
xx_power(dev_info_t *dip, int component, int level) {
struct xx *xx;
int rval = DDI_SUCCESS;
xx = ddi_get_soft_state(xx_softstate, ddi_get_instance(dip));
if (xx == NULL) {
return (DDI_FAILURE);
}
mutex_enter(&xx−>x_mutex);
switch (level) {
case PM_LEVEL_D0:
XX_POWER_ON(xx);
if (pci_restore_config_regs(dip) == DDI_FAILURE) {
/*
* appropriate error path handling here
*/
...
rval = DDI_FAILURE;
}
break;
case PM_LEVEL_D3:
if (pci_save_config_regs(dip) == DDI_FAILURE) {
/*
* appropriate error path handling here
*/
...
rval = DDI_FAILURE;
}
else {
XX_POWER_OFF(xx);
}
break;
default:
rval = DDI_FAILURE;
break;
}
mutex_exit(&xx−>x_mutex);
return (rval);
}
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Evolving │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOattributes(5), power(9E)
Writing Device Drivers
PCI Bus Power Management Interface Specification Version 1.1
PCI Bus Specification Revision 2.1
SunOS 5.10 02 June 2000 pci_save_config_regs(9F)
