PCI: Add interfaces to store and load the device saved state

For KVM device assignment, we'd like to save off the state of a device
prior to passing it to the guest and restore it later.  We also want
to allow pci_reset_funciton() to be called while the device is owned
by the guest.  This however overwrites and invalidates the struct pci_dev
buffers, so we can't just manually call save and restore.  Add generic
interfaces for the saved state to be stored and reloaded back into
struct pci_dev at a later time.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d6e5b8e..22c9b27 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -976,6 +976,104 @@ void pci_restore_state(struct pci_dev *dev)
        dev->state_saved = false;
 }
 
+struct pci_saved_state {
+       u32 config_space[16];
+       struct pci_cap_saved_data cap[0];
+};
+
+/**
+ * pci_store_saved_state - Allocate and return an opaque struct containing
+ *                        the device saved state.
+ * @dev: PCI device that we're dealing with
+ *
+ * Rerturn NULL if no state or error.
+ */
+struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev)
+{
+       struct pci_saved_state *state;
+       struct pci_cap_saved_state *tmp;
+       struct pci_cap_saved_data *cap;
+       struct hlist_node *pos;
+       size_t size;
+
+       if (!dev->state_saved)
+               return NULL;
+
+       size = sizeof(*state) + sizeof(struct pci_cap_saved_data);
+
+       hlist_for_each_entry(tmp, pos, &dev->saved_cap_space, next)
+               size += sizeof(struct pci_cap_saved_data) + tmp->cap.size;
+
+       state = kzalloc(size, GFP_KERNEL);
+       if (!state)
+               return NULL;
+
+       memcpy(state->config_space, dev->saved_config_space,
+              sizeof(state->config_space));
+
+       cap = state->cap;
+       hlist_for_each_entry(tmp, pos, &dev->saved_cap_space, next) {
+               size_t len = sizeof(struct pci_cap_saved_data) + tmp->cap.size;
+               memcpy(cap, &tmp->cap, len);
+               cap = (struct pci_cap_saved_data *)((u8 *)cap + len);
+       }
+       /* Empty cap_save terminates list */
+
+       return state;
+}
+EXPORT_SYMBOL_GPL(pci_store_saved_state);
+
+/**
+ * pci_load_saved_state - Reload the provided save state into struct pci_dev.
+ * @dev: PCI device that we're dealing with
+ * @state: Saved state returned from pci_store_saved_state()
+ */
+int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state)
+{
+       struct pci_cap_saved_data *cap;
+
+       dev->state_saved = false;
+
+       if (!state)
+               return 0;
+
+       memcpy(dev->saved_config_space, state->config_space,
+              sizeof(state->config_space));
+
+       cap = state->cap;
+       while (cap->size) {
+               struct pci_cap_saved_state *tmp;
+
+               tmp = pci_find_saved_cap(dev, cap->cap_nr);
+               if (!tmp || tmp->cap.size != cap->size)
+                       return -EINVAL;
+
+               memcpy(tmp->cap.data, cap->data, tmp->cap.size);
+               cap = (struct pci_cap_saved_data *)((u8 *)cap +
+                      sizeof(struct pci_cap_saved_data) + cap->size);
+       }
+
+       dev->state_saved = true;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(pci_load_saved_state);
+
+/**
+ * pci_load_and_free_saved_state - Reload the save state pointed to by state,
+ *                                and free the memory allocated for it.
+ * @dev: PCI device that we're dealing with
+ * @state: Pointer to saved state returned from pci_store_saved_state()
+ */
+int pci_load_and_free_saved_state(struct pci_dev *dev,
+                                 struct pci_saved_state **state)
+{
+       int ret = pci_load_saved_state(dev, *state);
+       kfree(*state);
+       *state = NULL;
+       return ret;
+}
+EXPORT_SYMBOL_GPL(pci_load_and_free_saved_state);
+
 static int do_pci_enable_device(struct pci_dev *dev, int bars)
 {
        int err;

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 61ef8f2..4604d1d 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -812,6 +812,10 @@ size_t pci_get_rom_size(struct pci_dev *pdev, void __iomem *rom, size_t size);
 /* Power management related routines */
 int pci_save_state(struct pci_dev *dev);
 void pci_restore_state(struct pci_dev *dev);
+struct pci_saved_state *pci_store_saved_state(struct pci_dev *dev);
+int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state);
+int pci_load_and_free_saved_state(struct pci_dev *dev,
+                                 struct pci_saved_state **state);
 int __pci_complete_power_transition(struct pci_dev *dev, pci_power_t state);
 int pci_set_power_state(struct pci_dev *dev, pci_power_t state);
 pci_power_t pci_choose_state(struct pci_dev *dev, pm_message_t state);