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x86/PCI: introduce pci_mmcfg_arch_map()/pci_mmcfg_arch_unmap()

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Introduce pci_mmcfg_arch_map()/pci_mmcfg_arch_unmap(), which will be used
when supporting PCI root bridge hotplug.

Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jiang Liu 2012-06-22 14:55:13 +08:00 committed by Bjorn Helgaas
parent 376f70acfe
commit 9cf0105da5
3 changed files with 43 additions and 12 deletions
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2
arch/x86/include/asm/pci_x86.h
View File

@ -135,6 +135,8 @@ struct pci_mmcfg_region {
extern int __init pci_mmcfg_arch_init(void);
extern void __init pci_mmcfg_arch_free(void);
extern int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
extern struct list_head pci_mmcfg_list;

15
arch/x86/pci/mmconfig_32.c
View File

@ -141,3 +141,18 @@ int __init pci_mmcfg_arch_init(void)
void __init pci_mmcfg_arch_free(void)
{
}
int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg)
{
return 0;
}
void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg)
{
unsigned long flags;
/* Invalidate the cached mmcfg map entry. */
raw_spin_lock_irqsave(&pci_config_lock, flags);
mmcfg_last_accessed_device = 0;
raw_spin_unlock_irqrestore(&pci_config_lock, flags);
}

38
arch/x86/pci/mmconfig_64.c
View File

@ -95,7 +95,7 @@ static const struct pci_raw_ops pci_mmcfg = {
.write = pci_mmcfg_write,
};
static void __iomem * __init mcfg_ioremap(struct pci_mmcfg_region *cfg)
static void __iomem * __devinit mcfg_ioremap(struct pci_mmcfg_region *cfg)
{
void __iomem *addr;
u64 start, size;
@ -114,16 +114,14 @@ int __init pci_mmcfg_arch_init(void)
{
struct pci_mmcfg_region *cfg;
list_for_each_entry(cfg, &pci_mmcfg_list, list) {
cfg->virt = mcfg_ioremap(cfg);
if (!cfg->virt) {
printk(KERN_ERR PREFIX "can't map MMCONFIG at %pR\n",
&cfg->res);
list_for_each_entry(cfg, &pci_mmcfg_list, list)
if (pci_mmcfg_arch_map(cfg)) {
pci_mmcfg_arch_free();
return 0;
}
}
raw_pci_ext_ops = &pci_mmcfg;
return 1;
}
@ -131,10 +129,26 @@ void __init pci_mmcfg_arch_free(void)
{
struct pci_mmcfg_region *cfg;
list_for_each_entry(cfg, &pci_mmcfg_list, list) {
if (cfg->virt) {
iounmap(cfg->virt + PCI_MMCFG_BUS_OFFSET(cfg->start_bus));
cfg->virt = NULL;
}
list_for_each_entry(cfg, &pci_mmcfg_list, list)
pci_mmcfg_arch_unmap(cfg);
}
int __devinit pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg)
{
cfg->virt = mcfg_ioremap(cfg);
if (!cfg->virt) {
printk(KERN_ERR PREFIX "can't map MMCONFIG at %pR\n",
&cfg->res);
return -ENOMEM;
}
return 0;
}
void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg)
{
if (cfg && cfg->virt) {
iounmap(cfg->virt + PCI_MMCFG_BUS_OFFSET(cfg->start_bus));
cfg->virt = NULL;
}
}