PCI: Restore PCI Express capability registers after PM event
Restore PCI Express capability registers after PM event. This includes maxumum MTU for PCI express and other vital data. Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -445,6 +445,51 @@ pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state)
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EXPORT_SYMBOL(pci_choose_state);
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static int pci_save_pcie_state(struct pci_dev *dev)
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{
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int pos, i = 0;
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struct pci_cap_saved_state *save_state;
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u16 *cap;
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pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
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if (pos <= 0)
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return 0;
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save_state = kzalloc(sizeof(*save_state) + sizeof(u16) * 4, GFP_KERNEL);
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if (!save_state) {
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dev_err(&dev->dev, "Out of memory in pci_save_pcie_state\n");
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return -ENOMEM;
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}
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cap = (u16 *)&save_state->data[0];
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pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &cap[i++]);
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pci_read_config_word(dev, pos + PCI_EXP_LNKCTL, &cap[i++]);
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pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
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pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
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pci_add_saved_cap(dev, save_state);
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return 0;
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}
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static void pci_restore_pcie_state(struct pci_dev *dev)
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{
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int i = 0, pos;
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struct pci_cap_saved_state *save_state;
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u16 *cap;
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save_state = pci_find_saved_cap(dev, PCI_CAP_ID_EXP);
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pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
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if (!save_state || pos <= 0)
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return;
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cap = (u16 *)&save_state->data[0];
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pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, cap[i++]);
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pci_write_config_word(dev, pos + PCI_EXP_LNKCTL, cap[i++]);
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pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
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pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
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pci_remove_saved_cap(save_state);
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kfree(save_state);
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}
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/**
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* pci_save_state - save the PCI configuration space of a device before suspending
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* @dev: - PCI device that we're dealing with
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@ -460,6 +505,8 @@ pci_save_state(struct pci_dev *dev)
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return i;
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if ((i = pci_save_msix_state(dev)) != 0)
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return i;
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if ((i = pci_save_pcie_state(dev)) != 0)
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return i;
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return 0;
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}
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@ -473,6 +520,9 @@ pci_restore_state(struct pci_dev *dev)
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int i;
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int val;
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/* PCI Express register must be restored first */
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pci_restore_pcie_state(dev);
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/*
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* The Base Address register should be programmed before the command
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* register(s)
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