PCI: Add support for save/restore of extended capabilities
Current save/restore is specific to standard capabilities.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index bb257b9..8f2be7e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -861,18 +861,28 @@
#define PCI_EXP_SAVE_REGS 7
-static struct pci_cap_saved_state *pci_find_saved_cap(
- struct pci_dev *pci_dev, char cap)
+static struct pci_cap_saved_state *_pci_find_saved_cap(struct pci_dev *pci_dev,
+ u16 cap, bool extended)
{
struct pci_cap_saved_state *tmp;
hlist_for_each_entry(tmp, &pci_dev->saved_cap_space, next) {
- if (tmp->cap.cap_nr == cap)
+ if (tmp->cap.cap_extended == extended && tmp->cap.cap_nr == cap)
return tmp;
}
return NULL;
}
+struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap)
+{
+ return _pci_find_saved_cap(dev, cap, false);
+}
+
+struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev, u16 cap)
+{
+ return _pci_find_saved_cap(dev, cap, true);
+}
+
static int pci_save_pcie_state(struct pci_dev *dev)
{
int i = 0;
@@ -1113,7 +1123,7 @@
while (cap->size) {
struct pci_cap_saved_state *tmp;
- tmp = pci_find_saved_cap(dev, cap->cap_nr);
+ tmp = _pci_find_saved_cap(dev, cap->cap_nr, cap->cap_extended);
if (!tmp || tmp->cap.size != cap->size)
return -EINVAL;
@@ -2047,18 +2057,24 @@
}
/**
- * pci_add_cap_save_buffer - allocate buffer for saving given capability registers
+ * _pci_add_cap_save_buffer - allocate buffer for saving given
+ * capability registers
* @dev: the PCI device
* @cap: the capability to allocate the buffer for
+ * @extended: Standard or Extended capability ID
* @size: requested size of the buffer
*/
-static int pci_add_cap_save_buffer(
- struct pci_dev *dev, char cap, unsigned int size)
+static int _pci_add_cap_save_buffer(struct pci_dev *dev, u16 cap,
+ bool extended, unsigned int size)
{
int pos;
struct pci_cap_saved_state *save_state;
- pos = pci_find_capability(dev, cap);
+ if (extended)
+ pos = pci_find_ext_capability(dev, cap);
+ else
+ pos = pci_find_capability(dev, cap);
+
if (pos <= 0)
return 0;
@@ -2067,12 +2083,23 @@
return -ENOMEM;
save_state->cap.cap_nr = cap;
+ save_state->cap.cap_extended = extended;
save_state->cap.size = size;
pci_add_saved_cap(dev, save_state);
return 0;
}
+int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size)
+{
+ return _pci_add_cap_save_buffer(dev, cap, false, size);
+}
+
+int pci_add_ext_cap_save_buffer(struct pci_dev *dev, u16 cap, unsigned int size)
+{
+ return _pci_add_cap_save_buffer(dev, cap, true, size);
+}
+
/**
* pci_allocate_cap_save_buffers - allocate buffers for saving capabilities
* @dev: the PCI device