PCI: save and restore PCIe 2.0 registers
PCIe 2.0 defines several new registers (Device Control 2, Link Control 2,
and Slot Control 2). Save and retore them in pci_save_pcie_state() and
pci_restore_pcie_state().
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 676bbcb..59569b8 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -647,6 +647,8 @@
EXPORT_SYMBOL(pci_choose_state);
+#define PCI_EXP_SAVE_REGS 7
+
static int pci_save_pcie_state(struct pci_dev *dev)
{
int pos, i = 0;
@@ -668,6 +670,9 @@
pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
+ pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]);
+ pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]);
+ pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]);
return 0;
}
@@ -688,6 +693,9 @@
pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
+ pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]);
+ pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]);
+ pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]);
}
@@ -1372,7 +1380,8 @@
{
int error;
- error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP, 4 * sizeof(u16));
+ error = pci_add_cap_save_buffer(dev, PCI_CAP_ID_EXP,
+ PCI_EXP_SAVE_REGS * sizeof(u16));
if (error)
dev_err(&dev->dev,
"unable to preallocate PCI Express save buffer\n");
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index d4e6638..e4d08c1 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -488,6 +488,8 @@
#define PCI_EXP_DEVCAP2_ARI 0x20 /* Alternative Routing-ID */
#define PCI_EXP_DEVCTL2 40 /* Device Control 2 */
#define PCI_EXP_DEVCTL2_ARI 0x20 /* Alternative Routing-ID */
+#define PCI_EXP_LNKCTL2 48 /* Link Control 2 */
+#define PCI_EXP_SLTCTL2 56 /* Slot Control 2 */
/* Extended Capabilities (PCI-X 2.0 and Express) */
#define PCI_EXT_CAP_ID(header) (header & 0x0000ffff)