hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[PATCH] pciehp: allow bridged card hotplug 

This patch fixes bugs in the pciehp driver that prevent hot-add
of a card with PCI bridges on it.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Rajesh Shah 2005-12-08 12:12:25 -08:00 committed by Greg Kroah-Hartman
parent c7ab337f91
commit 0eb3bcfd08
1 changed files with 28 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
drivers/pci/hotplug/pciehp_pci.c
View File

@ -34,6 +34,31 @@
#include "../pci.h"
#include "pciehp.h"
static int pciehp_add_bridge(struct pci_dev *dev)
{
struct pci_bus *parent = dev->bus;
int pass, busnr, start = parent->secondary;
int end = parent->subordinate;
for (busnr = start; busnr <= end; busnr++) {
if (!pci_find_bus(pci_domain_nr(parent), busnr))
break;
}
if (busnr-- > end) {
err("No bus number available for hot-added bridge %s\n",
pci_name(dev));
return -1;
}
for (pass = 0; pass < 2; pass++)
busnr = pci_scan_bridge(parent, dev, busnr, pass);
if (!dev->subordinate)
return -1;
pci_bus_size_bridges(dev->subordinate);
pci_bus_assign_resources(parent);
pci_enable_bridges(parent);
pci_bus_add_devices(parent);
return 0;
}
int pciehp_configure_device(struct slot *p_slot)
{
@ -55,8 +80,8 @@ int pciehp_configure_device(struct slot *p_slot)
}
for (fn = 0; fn < 8; fn++) {
if (!(dev = pci_find_slot(p_slot->bus,
PCI_DEVFN(p_slot->device, fn))))
dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
if (!dev)
continue;
if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
err("Cannot hot-add display device %s\n",
@ -65,27 +90,7 @@ int pciehp_configure_device(struct slot *p_slot)
}
if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
(dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
/* Find an unused bus number for the new bridge */
struct pci_bus *child;
unsigned char busnr, start = parent->secondary;
unsigned char end = parent->subordinate;
for (busnr = start; busnr <= end; busnr++) {
if (!pci_find_bus(pci_domain_nr(parent),
busnr))
break;
}
if (busnr >= end) {
err("No free bus for hot-added bridge\n");
continue;
}
child = pci_add_new_bus(parent, dev, busnr);
if (!child) {
err("Cannot add new bus for %s\n",
pci_name(dev));
continue;
}
child->subordinate = pci_do_scan_bus(child);
pci_bus_size_bridges(child);
pciehp_add_bridge(dev);
}
/* TBD: program firmware provided _HPP values */
/* program_fw_provided_values(dev); */
@ -93,7 +98,6 @@ int pciehp_configure_device(struct slot *p_slot)
pci_bus_assign_resources(parent);
pci_bus_add_devices(parent);
pci_enable_bridges(parent);
return 0;
}