PCI: save/restore PCI-X state (cc692a5f) · Commits · 戴 / test

drivers/pci/pci.c

+44 −0

Original line number	Diff line number	Diff line
		@@ -490,6 +490,47 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
		kfree(save_state);
		}


		static int pci_save_pcix_state(struct pci_dev *dev)
		{
		int pos, i = 0;
		struct pci_cap_saved_state *save_state;
		u16 *cap;

		pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
		if (pos <= 0)
		return 0;

		save_state = kzalloc(sizeof(*save_state) + sizeof(u16), GFP_KERNEL);
		if (!save_state) {
		dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
		return -ENOMEM;
		}
		cap = (u16 *)&save_state->data[0];

		pci_read_config_word(dev, pos + PCI_X_CMD, &cap[i++]);
		pci_add_saved_cap(dev, save_state);
		return 0;
		}

		static void pci_restore_pcix_state(struct pci_dev *dev)
		{
		int i = 0, pos;
		struct pci_cap_saved_state *save_state;
		u16 *cap;

		save_state = pci_find_saved_cap(dev, PCI_CAP_ID_PCIX);
		pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
		if (!save_state \|\| pos <= 0)
		return;
		cap = (u16 *)&save_state->data[0];

		pci_write_config_word(dev, pos + PCI_X_CMD, cap[i++]);
		pci_remove_saved_cap(save_state);
		kfree(save_state);
		}


		/**
		* pci_save_state - save the PCI configuration space of a device before suspending
		* @dev: - PCI device that we're dealing with
		@@ -507,6 +548,8 @@ pci_save_state(struct pci_dev *dev)
		return i;
		if ((i = pci_save_pcie_state(dev)) != 0)
		return i;
		if ((i = pci_save_pcix_state(dev)) != 0)
		return i;
		return 0;
		}

		@@ -538,6 +581,7 @@ pci_restore_state(struct pci_dev *dev)
		dev->saved_config_space[i]);
		}
		}
		pci_restore_pcix_state(dev);
		pci_restore_msi_state(dev);
		pci_restore_msix_state(dev);
		return 0;