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Add device location wiring to the pci bus.

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This allows one to specify, for example, that if there's an igb card
in bus 12, slot 0, function 0, it should be assigned igb5. If there
isn't, or there's one in a different slot, normal numbering rules
apply (hinted units are skipped). Adding 'hint.igb.5.at="pci12:0:0"'
or 'hint.igb.5.at="pci0:12:0:0"' to /boot/device.hints will accomplish
this. The double quotes are important.

The kernel only accepts the strings (in shell notation):
	pci$d:$b:$s:$f
and	pci$b:$s:$f
where $d is the pci domain, $b is the pci bus number, $s is the slot
number and $f is the function number. A string compare is done with
the current device to avoid another string parser in the kernel. All
numbers are unsigned decimal without leading zeros.

Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D13546
This commit is contained in:
Warner Losh 2017-12-20 19:14:05 +00:00
parent 4484c8f5d2
commit bb0107830d
1 changed files with 28 additions and 0 deletions
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28
sys/dev/pci/pci.c
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@ -123,6 +123,8 @@ static void pci_resume_msi(device_t dev);
static void pci_resume_msix(device_t dev);
static int pci_remap_intr_method(device_t bus, device_t dev,
u_int irq);
static void pci_hint_device_unit(device_t acdev, device_t child,
const char *name, int *unitp);
static int pci_get_id_method(device_t dev, device_t child,
enum pci_id_type type, uintptr_t *rid);
@ -162,6 +164,7 @@ static device_method_t pci_methods[] = {
DEVMETHOD(bus_child_detached, pci_child_detached),
DEVMETHOD(bus_child_pnpinfo_str, pci_child_pnpinfo_str_method),
DEVMETHOD(bus_child_location_str, pci_child_location_str_method),
DEVMETHOD(bus_hint_device_unit, pci_hint_device_unit),
DEVMETHOD(bus_remap_intr, pci_remap_intr_method),
DEVMETHOD(bus_suspend_child, pci_suspend_child),
DEVMETHOD(bus_resume_child, pci_resume_child),
@ -4220,6 +4223,31 @@ pci_detach(device_t dev)
return (device_delete_children(dev));
}
static void
pci_hint_device_unit(device_t dev, device_t child, const char *name, int *unitp)
{
int line, unit;
const char *at;
char me1[24], me2[32];
uint8_t b, s, f;
uint32_t d;
d = pci_get_domain(child);
b = pci_get_bus(child);
s = pci_get_slot(child);
f = pci_get_function(child);
snprintf(me1, sizeof(me1), "pci%u:%u:%u", b, s, f);
snprintf(me2, sizeof(me2), "pci%u:%u:%u:%u", d, b, s, f);
line = 0;
while (resource_find_dev(&line, name, &unit, "at", NULL) == 0) {
resource_string_value(name, unit, "at", &at);
if (strcmp(at, me1) != 0 && strcmp(at, me2) != 0)
continue; /* No match, try next candidate */
*unitp = unit;
return;
}
}
static void
pci_set_power_child(device_t dev, device_t child, int state)
{