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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>
This commit is contained in:
Alex Williamson 2013-12-17 16:43:45 -07:00 committed by Bjorn Helgaas
parent 157e876ffe
commit fd0f7f73ca
2 changed files with 43 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/pci/pci.c
View File

@ -861,18 +861,28 @@ EXPORT_SYMBOL(pci_choose_state);
#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 @@ int pci_load_saved_state(struct pci_dev *dev, struct pci_saved_state *state)
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 @@ static void pci_add_saved_cap(struct pci_dev *pci_dev,
}
/**
* 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 @@ static int pci_add_cap_save_buffer(
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

9
include/linux/pci.h
View File

@ -224,7 +224,8 @@ enum pci_bus_speed {
};
struct pci_cap_saved_data {
char cap_nr;
u16 cap_nr;
bool cap_extended;
unsigned int size;
u32 data[0];
};
@ -977,6 +978,12 @@ 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);
struct pci_cap_saved_state *pci_find_saved_cap(struct pci_dev *dev, char cap);
struct pci_cap_saved_state *pci_find_saved_ext_cap(struct pci_dev *dev,
u16 cap);
int pci_add_cap_save_buffer(struct pci_dev *dev, char cap, unsigned int size);
int pci_add_ext_cap_save_buffer(struct pci_dev *dev,
u16 cap, unsigned int size);
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);