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PCI: Refactor pci_reset_function()

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Separate out function level reset so that pci_reset_function can be more
easily extended.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Sheng Yang 2008-11-11 17:17:47 +08:00 committed by Jesse Barnes
parent 1a9271331a
commit d91cdc7455
1 changed files with 40 additions and 26 deletions
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66
drivers/pci/pci.c
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@ -1751,24 +1751,7 @@ int pci_set_dma_seg_boundary(struct pci_dev *dev, unsigned long mask)
EXPORT_SYMBOL(pci_set_dma_seg_boundary);
#endif
/**
* pci_execute_reset_function() - Reset a PCI device function
* @dev: Device function to reset
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
* to PCI config space in order to use this function.
*
* The device function is presumed to be unused when this function is called.
* Resetting the device will make the contents of PCI configuration space
* random, so any caller of this must be prepared to reinitialise the
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
* etc.
*
* Returns 0 if the device function was successfully reset or -ENOTTY if the
* device doesn't support resetting a single function.
*/
int pci_execute_reset_function(struct pci_dev *dev)
static int __pcie_flr(struct pci_dev *dev, int probe)
{
u16 status;
u32 cap;
@ -1780,6 +1763,9 @@ int pci_execute_reset_function(struct pci_dev *dev)
if (!(cap & PCI_EXP_DEVCAP_FLR))
return -ENOTTY;
if (probe)
return 0;
pci_block_user_cfg_access(dev);
/* Wait for Transaction Pending bit clean */
@ -1802,6 +1788,39 @@ int pci_execute_reset_function(struct pci_dev *dev)
pci_unblock_user_cfg_access(dev);
return 0;
}
static int __pci_reset_function(struct pci_dev *pdev, int probe)
{
int res;
res = __pcie_flr(pdev, probe);
if (res != -ENOTTY)
return res;
return res;
}
/**
* pci_execute_reset_function() - Reset a PCI device function
* @dev: Device function to reset
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
* to PCI config space in order to use this function.
*
* The device function is presumed to be unused when this function is called.
* Resetting the device will make the contents of PCI configuration space
* random, so any caller of this must be prepared to reinitialise the
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
* etc.
*
* Returns 0 if the device function was successfully reset or -ENOTTY if the
* device doesn't support resetting a single function.
*/
int pci_execute_reset_function(struct pci_dev *dev)
{
return __pci_reset_function(dev, 0);
}
EXPORT_SYMBOL_GPL(pci_execute_reset_function);
/**
@ -1822,15 +1841,10 @@ EXPORT_SYMBOL_GPL(pci_execute_reset_function);
*/
int pci_reset_function(struct pci_dev *dev)
{
u32 cap;
int exppos = pci_find_capability(dev, PCI_CAP_ID_EXP);
int r;
int r = __pci_reset_function(dev, 1);
if (!exppos)
return -ENOTTY;
pci_read_config_dword(dev, exppos + PCI_EXP_DEVCAP, &cap);
if (!(cap & PCI_EXP_DEVCAP_FLR))
return -ENOTTY;
if (r < 0)
return r;
if (!dev->msi_enabled && !dev->msix_enabled && dev->irq != 0)
disable_irq(dev->irq);