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|
/*
* PCI Hotplug Driver for PowerPC PowerNV platform.
*
* Copyright Gavin Shan, IBM Corporation 2016.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/libfdt.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/opal.h>
#include <asm/pnv-pci.h>
#include <asm/ppc-pci.h>
#define DRIVER_VERSION "0.1"
#define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
#define DRIVER_DESC "PowerPC PowerNV PCI Hotplug Driver"
static LIST_HEAD(pnv_php_slot_list);
static DEFINE_SPINLOCK(pnv_php_lock);
static void pnv_php_register(struct device_node *dn);
static void pnv_php_unregister_one(struct device_node *dn);
static void pnv_php_unregister(struct device_node *dn);
static void pnv_php_free_slot(struct kref *kref)
{
struct pnv_php_slot *php_slot = container_of(kref,
struct pnv_php_slot, kref);
WARN_ON(!list_empty(&php_slot->children));
kfree(php_slot->name);
kfree(php_slot);
}
static inline void pnv_php_put_slot(struct pnv_php_slot *php_slot)
{
if (WARN_ON(!php_slot))
return;
kref_put(&php_slot->kref, pnv_php_free_slot);
}
static struct pnv_php_slot *pnv_php_match(struct device_node *dn,
struct pnv_php_slot *php_slot)
{
struct pnv_php_slot *target, *tmp;
if (php_slot->dn == dn) {
kref_get(&php_slot->kref);
return php_slot;
}
list_for_each_entry(tmp, &php_slot->children, link) {
target = pnv_php_match(dn, tmp);
if (target)
return target;
}
return NULL;
}
struct pnv_php_slot *pnv_php_find_slot(struct device_node *dn)
{
struct pnv_php_slot *php_slot, *tmp;
unsigned long flags;
spin_lock_irqsave(&pnv_php_lock, flags);
list_for_each_entry(tmp, &pnv_php_slot_list, link) {
php_slot = pnv_php_match(dn, tmp);
if (php_slot) {
spin_unlock_irqrestore(&pnv_php_lock, flags);
return php_slot;
}
}
spin_unlock_irqrestore(&pnv_php_lock, flags);
return NULL;
}
EXPORT_SYMBOL_GPL(pnv_php_find_slot);
/*
* Remove pdn for all children of the indicated device node.
* The function should remove pdn in a depth-first manner.
*/
static void pnv_php_rmv_pdns(struct device_node *dn)
{
struct device_node *child;
for_each_child_of_node(dn, child) {
pnv_php_rmv_pdns(child);
pci_remove_device_node_info(child);
}
}
/*
* Detach all child nodes of the indicated device nodes. The
* function should handle device nodes in depth-first manner.
*
* We should not invoke of_node_release() as the memory for
* individual device node is part of large memory block. The
* large block is allocated from memblock (system bootup) or
* kmalloc() when unflattening the device tree by OF changeset.
* We can not free the large block allocated from memblock. For
* later case, it should be released at once.
*/
static void pnv_php_detach_device_nodes(struct device_node *parent)
{
struct device_node *dn;
int refcount;
for_each_child_of_node(parent, dn) {
pnv_php_detach_device_nodes(dn);
of_node_put(dn);
refcount = atomic_read(&dn->kobj.kref.refcount);
if (unlikely(refcount != 1))
pr_warn("Invalid refcount %d on <%s>\n",
refcount, of_node_full_name(dn));
of_detach_node(dn);
}
}
static void pnv_php_rmv_devtree(struct pnv_php_slot *php_slot)
{
pnv_php_rmv_pdns(php_slot->dn);
/*
* Decrease the refcount if the device nodes were created
* through OF changeset before detaching them.
*/
if (php_slot->fdt)
of_changeset_destroy(&php_slot->ocs);
pnv_php_detach_device_nodes(php_slot->dn);
if (php_slot->fdt) {
kfree(php_slot->dt);
kfree(php_slot->fdt);
php_slot->dt = NULL;
php_slot->dn->child = NULL;
php_slot->fdt = NULL;
}
}
/*
* As the nodes in OF changeset are applied in reverse order, we
* need revert the nodes in advance so that we have correct node
* order after the changeset is applied.
*/
static void pnv_php_reverse_nodes(struct device_node *parent)
{
struct device_node *child, *next;
/* In-depth first */
for_each_child_of_node(parent, child)
pnv_php_reverse_nodes(child);
/* Reverse the nodes in the child list */
child = parent->child;
parent->child = NULL;
while (child) {
next = child->sibling;
child->sibling = parent->child;
parent->child = child;
child = next;
}
}
static int pnv_php_populate_changeset(struct of_changeset *ocs,
struct device_node *dn)
{
struct device_node *child;
int ret = 0;
for_each_child_of_node(dn, child) {
ret = of_changeset_attach_node(ocs, child);
if (unlikely(ret))
break;
ret = pnv_php_populate_changeset(ocs, child);
if (unlikely(ret))
break;
}
return ret;
}
static void *pnv_php_add_one_pdn(struct device_node *dn, void *data)
{
struct pci_controller *hose = (struct pci_controller *)data;
struct pci_dn *pdn;
pdn = pci_add_device_node_info(hose, dn);
if (unlikely(!pdn))
return ERR_PTR(-ENOMEM);
return NULL;
}
static void pnv_php_add_pdns(struct pnv_php_slot *slot)
{
struct pci_controller *hose = pci_bus_to_host(slot->bus);
pci_traverse_device_nodes(slot->dn, pnv_php_add_one_pdn, hose);
}
static int pnv_php_add_devtree(struct pnv_php_slot *php_slot)
{
void *fdt, *fdt1, *dt;
int ret;
/* We don't know the FDT blob size. We try to get it through
* maximal memory chunk and then copy it to another chunk that
* fits the real size.
*/
fdt1 = kzalloc(0x10000, GFP_KERNEL);
if (unlikely(!fdt1)) {
ret = -ENOMEM;
dev_warn(&php_slot->pdev->dev, "Cannot alloc FDT blob\n");
goto out;
}
ret = pnv_pci_get_device_tree(php_slot->dn->phandle, fdt1, 0x10000);
if (unlikely(ret)) {
dev_warn(&php_slot->pdev->dev, "Error %d getting FDT blob\n",
|