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| author | Shaohua Li <shaohua.li@intel.com> | 2007-10-24 10:45:08 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-01 15:04:19 -0800 |
| commit | 4348a2dc49f9baecd34a9b0904245488c6189398 (patch) | |
| tree | cbe391c0f28ac367767c7427991cd9689c042458 | |
| parent | 39ec4561b3a9ccccbdab1dd88a045342be22f27b (diff) | |
| download | linux-4348a2dc49f9baecd34a9b0904245488c6189398.tar.gz linux-4348a2dc49f9baecd34a9b0904245488c6189398.tar.bz2 linux-4348a2dc49f9baecd34a9b0904245488c6189398.zip | |
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>
| -rw-r--r-- | drivers/pci/pci.c | 21 | ||||
| -rw-r--r-- | include/linux/pci.h | 2 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 089184bc327d..d30e802d9a1a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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, ®16); + 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; diff --git a/include/linux/pci.h b/include/linux/pci.h index d2cae79f3bea..bdff18b7fbc6 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -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; } |