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/* Copyright 2017 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <skiboot.h>
#include <device.h>
#include <pci.h>
#include <pci-cfg.h>
#include <pci-slot.h>
#include <ccan/list/list.h>
#undef pr_fmt
#define pr_fmt(fmt) "DT-SLOT: " fmt
#define PCIDBG(_p, _bdfn, fmt, a...) \
prlog(PR_DEBUG, "PHB#%04x:%02x:%02x.%x " fmt, \
(_p)->opal_id, \
((_bdfn) >> 8) & 0xff, \
((_bdfn) >> 3) & 0x1f, (_bdfn) & 0x7, ## a)
struct dt_node *dt_slots;
static struct dt_node *map_phb_to_slot(struct phb *phb)
{
uint32_t chip_id = dt_get_chip_id(phb->dt_node);
uint32_t phb_idx = dt_prop_get_u32_def(phb->dt_node,
"ibm,phb-index", 0);
struct dt_node *slot_node;
if (!dt_slots)
dt_slots = dt_find_by_path(dt_root, "/ibm,pcie-slots");
if (!dt_slots)
return NULL;
dt_for_each_child(dt_slots, slot_node) {
u32 reg[2];
if (!dt_node_is_compatible(slot_node, "ibm,pcie-root-port"))
continue;
reg[0] = dt_prop_get_cell(slot_node, "reg", 0);
reg[1] = dt_prop_get_cell(slot_node, "reg", 1);
if (reg[0] == chip_id && reg[1] == phb_idx)
return slot_node;
}
return NULL;
}
static struct dt_node *find_devfn(struct dt_node *bus, uint32_t bdfn)
{
uint32_t port_dev_id = (bdfn >> 3) & 0x1f;
struct dt_node *child;
dt_for_each_child(bus, child)
if (dt_prop_get_u32_def(child, "reg", ~0u) == port_dev_id)
return child;
return NULL;
}
/* Looks for a device device under this slot. */
static struct dt_node *find_dev_under_slot(struct dt_node *slot,
struct pci_device *pd)
{
struct dt_node *child, *wildcard = NULL;
/* find the device in the parent bus node */
dt_for_each_child(slot, child) {
u32 vdid;
/* "pluggable" and "builtin" without unit addrs are wildcards */
if (!dt_has_node_property(child, "reg", NULL)) {
if (wildcard)
prerror("Duplicate wildcard entry! Already have %s, found %s",
wildcard->name, child->name);
wildcard = child;
continue;
}
/* NB: the pci_device vdid is did,vid rather than vid,did */
vdid = dt_prop_get_cell(child, "reg", 1) << 16 |
dt_prop_get_cell(child, "reg", 0);
if (vdid == pd->vdid)
return child;
}
if (!wildcard)
PCIDBG(pd->phb, pd->bdfn,
"Unable to find a slot for device %.4x:%.4x\n",
(pd->vdid & 0xffff0000) >> 16, pd->vdid & 0xffff);
return wildcard;
}
/*
* If the `pd` is a bridge this returns a node with a compatible of
* ibm,pcie-port to indicate it's a "slot node".
*/
static struct dt_node *find_node_for_dev(struct phb *phb,
struct pci_device *pd)
{
struct dt_node *sw_slot, *sw_up;
assert(pd);
if (pd->slot && pd->slot->data)
return pd->slot->data;
/*
* Example DT:
* /root-complex@8,5/switch-up@10b5,8725/down-port@4
*/
switch (pd->dev_type) {
case PCIE_TYPE_ROOT_PORT: // find the root-complex@<chip>,<phb> node
return map_phb_to_slot(phb);
case PCIE_TYPE_SWITCH_DNPORT: // grab the down-port@<devfn>
/*
* Walk up the topology to find the slot that contains
* the switch upstream port is connected to. In the example
* this would be the root-complex@8,5 node.
*/
sw_slot = find_node_for_dev(phb, pd->parent->parent);
if (!sw_slot)
return NULL;
/* find the per-device node for this switch */
sw_up = find_dev_under_slot(sw_slot, pd->parent);
if (!sw_up)
return NULL;
/* find this down port */
return find_devfn(sw_up, pd->bdfn);
default:
PCIDBG(phb, pd->bdfn,
"Trying to find a slot for non-pcie bridge type %d\n",
pd->dev_type);
assert(0);
}
return NULL;
}
struct dt_node *map_pci_dev_to_slot(struct phb *phb, struct pci_device *pd)
{
struct dt_node *n;
char *path;
assert(pd);
/*
* Having a slot only makes sense for root and switch downstream ports.
* We don't care about PCI-X.
*/
if (pd->dev_type != PCIE_TYPE_SWITCH_DNPORT &&
pd->dev_type != PCIE_TYPE_ROOT_PORT)
return NULL;
PCIDBG(phb, pd->bdfn, "Finding slot\n");
n = find_node_for_dev(phb, pd);
if (!n) {
PCIDBG(phb, pd->bdfn, "No slot found!\n");
} else {
path = dt_get_path(n);
PCIDBG(phb, pd->bdfn, "Slot found %s\n", path);
free(path);
}
return n;
}
int __print_slot(struct phb *phb, struct pci_device *pd, void *userdata);
int __print_slot(struct phb *phb, struct pci_device *pd,
void __unused *userdata)
{
struct dt_node *node;
struct dt_node *pnode;
char *c = NULL;
u32 phandle = 0;
if (!pd)
return 0;
node = map_pci_dev_to_slot(phb, pd);
/* at this point all node associations should be done */
if (pd->dn && dt_has_node_property(pd->dn, "ibm,pcie-slot", NULL)) {
phandle = dt_prop_get_u32(pd->dn, "ibm,pcie-slot");
pnode = dt_find_by_phandle(dt_root, phandle);
assert(node == pnode);
}
if (node)
c = dt_get_path(node);
PCIDBG(phb, pd->bdfn, "Mapped to slot %s (%x)\n",
c ? c : "<null>", phandle);
free(c);
return 0;
}
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