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x86/PCI: Infrastructure to maintain a list of FW-assigned BIOS BAR values

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Commit 58c84eda07 introduced functionality to try and reinstate the
original BIOS BAR addresses of a PCI device when normal resource
assignment attempts fail.  To keep track of the BIOS BAR addresses,
struct pci_dev was augmented with an array to hold the BAR addresses
of the PCI device: 'resource_size_t fw_addr[DEVICE_COUNT_RESOURCE]'.

The reinstatement of BAR addresses is an uncommon event leaving the
'fw_addr' array unused under normal circumstances.  This functionality
is also currently architecture specific with an implementation limited
to x86.  As the use of struct pci_dev is so prevalent, having the
'fw_addr' array residing within such seems somewhat wasteful.

This patch introduces a stand alone data structure and interfacing
routines for maintaining a list of FW-assigned BIOS BAR value entries.

Signed-off-by: Myron Stowe <myron.stowe@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Myron Stowe 2011-11-21 11:54:13 -07:00 committed by Jesse Barnes
parent 351fc6d1a5
commit 925845bd49
2 changed files with 80 additions and 0 deletions
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79
arch/x86/pci/i386.c
View File

@ -39,6 +39,85 @@
#include <asm/io_apic.h>
/*
* This list of dynamic mappings is for temporarily maintaining
* original BIOS BAR addresses for possible reinstatement.
*/
struct pcibios_fwaddrmap {
struct list_head list;
struct pci_dev *dev;
resource_size_t fw_addr[DEVICE_COUNT_RESOURCE];
};
static LIST_HEAD(pcibios_fwaddrmappings);
static DEFINE_SPINLOCK(pcibios_fwaddrmap_lock);
/* Must be called with 'pcibios_fwaddrmap_lock' lock held. */
static struct pcibios_fwaddrmap *pcibios_fwaddrmap_lookup(struct pci_dev *dev)
{
struct pcibios_fwaddrmap *map;
list_for_each_entry(map, &pcibios_fwaddrmappings, list)
if (map->dev == dev)
return map;
return NULL;
}
static void
pcibios_save_fw_addr(struct pci_dev *dev, int idx, resource_size_t fw_addr)
{
unsigned long flags;
struct pcibios_fwaddrmap *map;
spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
map = pcibios_fwaddrmap_lookup(dev);
if (!map) {
spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
map = kzalloc(sizeof(*map), GFP_KERNEL);
if (!map)
return;
map->dev = pci_dev_get(dev);
map->fw_addr[idx] = fw_addr;
INIT_LIST_HEAD(&map->list);
spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
list_add_tail(&map->list, &pcibios_fwaddrmappings);
} else
map->fw_addr[idx] = fw_addr;
spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
}
resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
{
unsigned long flags;
struct pcibios_fwaddrmap *map;
resource_size_t fw_addr = 0;
spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
map = pcibios_fwaddrmap_lookup(dev);
if (map)
fw_addr = map->fw_addr[idx];
spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
return fw_addr;
}
static void pcibios_fw_addr_list_del(void)
{
unsigned long flags;
struct pcibios_fwaddrmap *entry, *next;
spin_lock_irqsave(&pcibios_fwaddrmap_lock, flags);
list_for_each_entry_safe(entry, next, &pcibios_fwaddrmappings, list) {
list_del(&entry->list);
pci_dev_put(entry->dev);
kfree(entry);
}
spin_unlock_irqrestore(&pcibios_fwaddrmap_lock, flags);
}
static int
skip_isa_ioresource_align(struct pci_dev *dev) {

1
include/linux/pci.h
View File

@ -891,6 +891,7 @@ ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void
int pci_vpd_truncate(struct pci_dev *dev, size_t size);
/* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
resource_size_t pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx);
void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);