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powerpc/powernv: Skip check on PE if necessary 

While the device driver or PCI core tries to enable PCI device, the
platform dependent callback "ppc_md.pcibios_enable_device_hook" will
be called to check if there has one associated PE for the PCI device.
If we don't have the associated PE for the PCI device, it's not allowed
to enable the PCI device. Unfortunately, there might have some cases
we have to enable the PCI device (e.g. P2P bridge), but the PEs have
not been created yet.

The patch handles the unfortunate cases. Each PHB (struct pnv_phb)
has one field "initialized" to trace if the PEs have been created
and configured or not. When the PEs are not available, we won't check
the associated PE for the PCI device to be enabled.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Reviewed-by: Ram Pai <linuxram@us.ibm.com>
Reviewed-by: Richard Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2012-08-20 03:49:18 +00:00 committed by Benjamin Herrenschmidt
parent 13395c48c3
commit db1266c852
2 changed files with 19 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arch/powerpc/platforms/powernv/pci-ioda.c
View File

@ -1244,9 +1244,14 @@ static void __devinit pnv_pci_ioda_setup_seg(void)
static void __devinit pnv_pci_ioda_setup_DMA(void)
{
struct pci_controller *hose, *tmp;
struct pnv_phb *phb;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
pnv_ioda_setup_dma(hose->private_data);
/* Mark the PHB initialization done */
phb = hose->private_data;
phb->initialized = 1;
}
}
@ -1300,10 +1305,22 @@ static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
*/
static int __devinit pnv_pci_enable_device_hook(struct pci_dev *dev)
{
struct pci_dn *pdn = pnv_ioda_get_pdn(dev);
struct pci_controller *hose = pci_bus_to_host(dev->bus);
struct pnv_phb *phb = hose->private_data;
struct pci_dn *pdn;
/* The function is probably called while the PEs have
* not be created yet. For example, resource reassignment
* during PCI probe period. We just skip the check if
* PEs isn't ready.
*/
if (!phb->initialized)
return 0;
pdn = pnv_ioda_get_pdn(dev);
if (!pdn || pdn->pe_number == IODA_INVALID_PE)
return -EINVAL;
return 0;
}

1
arch/powerpc/platforms/powernv/pci.h
View File

@ -69,6 +69,7 @@ struct pnv_phb {
enum pnv_phb_model model;
u64 opal_id;
void __iomem *regs;
int initialized;
spinlock_t lock;
#ifdef CONFIG_PCI_MSI