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x86/PCI: Convert maintaining FW-assigned BIOS BAR values to use a list 

This patch converts the underlying maintenance aspects of FW-assigned
BIOS BAR values from a statically allocated array within struct pci_dev
to a list of temporary, stand alone, 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 11:54:19 -07:00 committed by Jesse Barnes
parent 925845bd49
commit 6535943fbf
3 changed files with 24 additions and 5 deletions
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4
arch/x86/pci/i386.c
View File

@ -261,7 +261,8 @@ static void __init pcibios_allocate_resources(int pass)
idx, r, disabled, pass);
if (pci_claim_resource(dev, idx) < 0) {
/* We'll assign a new address later */
dev->fw_addr[idx] = r->start;
pcibios_save_fw_addr(dev,
idx, r->start);
r->end -= r->start;
r->start = 0;
}
@ -307,6 +308,7 @@ static int __init pcibios_assign_resources(void)
}
pci_assign_unassigned_resources();
pcibios_fw_addr_list_del();
return 0;
}

24
drivers/pci/setup-res.c
View File

@ -158,16 +158,34 @@ static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
return ret;
}
/*
* Generic function that returns a value indicating that the device's
* original BIOS BAR address was not saved and so is not available for
* reinstatement.
*
* Can be over-ridden by architecture specific code that implements
* reinstatement functionality rather than leaving it disabled when
* normal allocation attempts fail.
*/
resource_size_t __weak pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
{
return 0;
}
static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
int resno, resource_size_t size)
{
struct resource *root, *conflict;
resource_size_t start, end;
resource_size_t fw_addr, start, end;
int ret = 0;
fw_addr = pcibios_retrieve_fw_addr(dev, resno);
if (!fw_addr)
return 1;
start = res->start;
end = res->end;
res->start = dev->fw_addr[resno];
res->start = fw_addr;
res->end = res->start + size - 1;
root = pci_find_parent_resource(dev, res);
@ -271,7 +289,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
* where firmware left it. That at least has a chance of
* working, which is better than just leaving it disabled.
*/
if (ret < 0 && dev->fw_addr[resno])
if (ret < 0)
ret = pci_revert_fw_address(res, dev, resno, size);
if (!ret) {

1
include/linux/pci.h
View File

@ -299,7 +299,6 @@ struct pci_dev {
*/
unsigned int irq;
struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */
resource_size_t fw_addr[DEVICE_COUNT_RESOURCE]; /* FW-assigned addr */
/* These fields are used by common fixups */
unsigned int transparent:1; /* Transparent PCI bridge */