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6 .TH PCI_SAVE_CONFIG_REGS 9F "Jun 02, 2000"
8 pci_save_config_regs, pci_restore_config_regs \- save and restore the PCI
9 configuration registers
13 \fB#include <sys/ddi.h>\fR
14 \fB#include <sys/sunddi.h>\fR
18 \fBint\fR \fBpci_save_config_regs\fR(\fBdev_info_t *\fR\fIdip\fR);
23 \fBint\fR \fBpci_restore_config_regs\fR(\fBdev_info_t *\fR\fIdip\fR);
29 Solaris DDI-specific (Solaris DDI).
37 Pointer to the device's \fBdev_info\fR structure.
43 \fBpci_save_config_regs()\fR saves the current configuration registers on
44 persistent system memory. \fBpci_restore_config_regs()\fR restores
45 configuration registers previously saved by \fBpci_save_config_regs()\fR.
48 \fBpci_save_config_regs()\fR should be called by the driver's \fBpower()\fR
49 entry point before powering a device off (to PCI state D3). Likewise,
50 \fBpci_restore_config_regs()\fR should be called after powering a device on
51 (from PCI state D3), but before accessing the device. See \fBpower\fR(9E).
55 \fBpci_save_config_regs()\fR and \fBpci_restore_config_regs()\fR return:
59 \fB\fBDDI_SUCCESS\fR\fR
62 Operation completed successfully.
68 \fB\fBDDI_FAILURE\fR\fR
71 Operation failed to complete successfully.
77 Both these functions can be called from user or kernel context.
80 \fBExample 1 \fRInvoking the save and restore functions
85 xx_power(dev_info_t *dip, int component, int level) {
87 int rval = DDI_SUCCESS;
89 xx = ddi_get_soft_state(xx_softstate, ddi_get_instance(dip));
94 mutex_enter(&xx\(mi>x_mutex);
99 if (pci_restore_config_regs(dip) == DDI_FAILURE) {
101 * appropriate error path handling here
109 if (pci_save_config_regs(dip) == DDI_FAILURE) {
111 * appropriate error path handling here
126 mutex_exit(&xx\(mi>x_mutex);
135 See \fBattributes\fR(5) for descriptions of the following attributes:
143 ATTRIBUTE TYPE ATTRIBUTE VALUE
145 Interface Stability Committed
151 \fBattributes\fR(5), \fBpower\fR(9E)
154 \fIWriting Device Drivers\fR
157 \fIPCI Bus Power Management Interface Specification Version 1.1\fR
160 \fIPCI Bus Specification Revision 2.1\fR