Contributors: 7
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Sinan Kaya |
113 |
51.60% |
2 |
22.22% |
| Aaron Durbin |
75 |
34.25% |
1 |
11.11% |
| Matthew Garrett |
13 |
5.94% |
2 |
22.22% |
| Linus Torvalds |
12 |
5.48% |
1 |
11.11% |
| Laszlo Toth |
3 |
1.37% |
1 |
11.11% |
| Lin Ming |
2 |
0.91% |
1 |
11.11% |
| Greg Kroah-Hartman |
1 |
0.46% |
1 |
11.11% |
| Total |
219 |
|
9 |
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/reboot.h>
#ifdef CONFIG_PCI
static void acpi_pci_reboot(struct acpi_generic_address *rr, u8 reset_value)
{
unsigned int devfn;
struct pci_bus *bus0;
/* The reset register can only live on bus 0. */
bus0 = pci_find_bus(0, 0);
if (!bus0)
return;
/* Form PCI device/function pair. */
devfn = PCI_DEVFN((rr->address >> 32) & 0xffff,
(rr->address >> 16) & 0xffff);
pr_debug("Resetting with ACPI PCI RESET_REG.\n");
/* Write the value that resets us. */
pci_bus_write_config_byte(bus0, devfn,
(rr->address & 0xffff), reset_value);
}
#else
static inline void acpi_pci_reboot(struct acpi_generic_address *rr,
u8 reset_value)
{
pr_warn_once("PCI configuration space access is not supported\n");
}
#endif
void acpi_reboot(void)
{
struct acpi_generic_address *rr;
u8 reset_value;
if (acpi_disabled)
return;
rr = &acpi_gbl_FADT.reset_register;
/* ACPI reset register was only introduced with v2 of the FADT */
if (acpi_gbl_FADT.header.revision < 2)
return;
/* Is the reset register supported? The spec says we should be
* checking the bit width and bit offset, but Windows ignores
* these fields */
if (!(acpi_gbl_FADT.flags & ACPI_FADT_RESET_REGISTER))
return;
reset_value = acpi_gbl_FADT.reset_value;
/* The reset register can only exist in I/O, Memory or PCI config space
* on a device on bus 0. */
switch (rr->space_id) {
case ACPI_ADR_SPACE_PCI_CONFIG:
acpi_pci_reboot(rr, reset_value);
break;
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
case ACPI_ADR_SPACE_SYSTEM_IO:
printk(KERN_DEBUG "ACPI MEMORY or I/O RESET_REG.\n");
acpi_reset();
break;
}
}