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pcie: utilize pcie transaction pending bit 

PCIE has a mechanism to wait for Non-Posted request to complete. I think
pci_disable_device is a good place to do this.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Shaohua Li 2007-10-24 10:45:08 +08:00 committed by Greg Kroah-Hartman
parent 39ec4561b3
commit 4348a2dc49
2 changed files with 23 additions and 0 deletions
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21
drivers/pci/pci.c
View File

@ -314,6 +314,24 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
}
EXPORT_SYMBOL_GPL(pci_find_ht_capability);
void pcie_wait_pending_transaction(struct pci_dev *dev)
{
int pos;
u16 reg16;
pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!pos)
return;
while (1) {
pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);
if (!(reg16 & PCI_EXP_DEVSTA_TRPND))
break;
cpu_relax();
}
}
EXPORT_SYMBOL_GPL(pcie_wait_pending_transaction);
/**
* pci_find_parent_resource - return resource region of parent bus of given region
* @dev: PCI device structure contains resources to be searched
@ -884,6 +902,9 @@ pci_disable_device(struct pci_dev *dev)
if (atomic_sub_return(1, &dev->enable_cnt) != 0)
return;
/* Wait for all transactions are finished before disabling the device */
pcie_wait_pending_transaction(dev);
pci_read_config_word(dev, PCI_COMMAND, &pci_command);
if (pci_command & PCI_COMMAND_MASTER) {
pci_command &= ~PCI_COMMAND_MASTER;

2
include/linux/pci.h
View File

@ -498,6 +498,7 @@ int pci_find_next_capability (struct pci_dev *dev, u8 pos, int cap);
int pci_find_ext_capability (struct pci_dev *dev, int cap);
int pci_find_ht_capability (struct pci_dev *dev, int ht_cap);
int pci_find_next_ht_capability (struct pci_dev *dev, int pos, int ht_cap);
void pcie_wait_pending_transaction(struct pci_dev *dev);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,
@ -759,6 +760,7 @@ static inline void pci_unregister_driver(struct pci_driver *drv) { }
static inline int pci_find_capability (struct pci_dev *dev, int cap) {return 0; }
static inline int pci_find_next_capability (struct pci_dev *dev, u8 post, int cap) { return 0; }
static inline int pci_find_ext_capability (struct pci_dev *dev, int cap) {return 0; }
static inline void pcie_wait_pending_transaction(struct pci_dev *dev) {}
/* Power management related routines */
static inline int pci_save_state(struct pci_dev *dev) { return 0; }