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PCI: Enable ATS at the device state restore 

During S3 or S4 resume or PCI reset, ATS regs aren't restored correctly.
This patch enables ATS at the device state restore if PCI device has ATS
capability.

Signed-off-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Hao, Xudong 2011-12-17 21:24:40 +08:00 committed by Jesse Barnes
parent 424eb39159
commit 1900ca132f
3 changed files with 26 additions and 0 deletions
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17
drivers/pci/ats.c
View File

@ -128,6 +128,23 @@ void pci_disable_ats(struct pci_dev *dev)
}
EXPORT_SYMBOL_GPL(pci_disable_ats);
void pci_restore_ats_state(struct pci_dev *dev)
{
u16 ctrl;
if (!pci_ats_enabled(dev))
return;
if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS))
BUG();
ctrl = PCI_ATS_CTRL_ENABLE;
if (!dev->is_virtfn)
ctrl |= PCI_ATS_CTRL_STU(dev->ats->stu - PCI_ATS_MIN_STU);
pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
}
EXPORT_SYMBOL_GPL(pci_restore_ats_state);
/**
* pci_ats_queue_depth - query the ATS Invalidate Queue Depth
* @dev: the PCI device

1
drivers/pci/pci.c
View File

@ -965,6 +965,7 @@ void pci_restore_state(struct pci_dev *dev)
/* PCI Express register must be restored first */
pci_restore_pcie_state(dev);
pci_restore_ats_state(dev);
/*
* The Base Address register should be programmed before the command

8
drivers/pci/pci.h
View File

@ -251,6 +251,14 @@ struct pci_sriov {
u8 __iomem *mstate; /* VF Migration State Array */
};
#ifdef CONFIG_PCI_ATS
extern void pci_restore_ats_state(struct pci_dev *dev);
#else
static inline void pci_restore_ats_state(struct pci_dev *dev)
{
}
#endif /* CONFIG_PCI_ATS */
#ifdef CONFIG_PCI_IOV
extern int pci_iov_init(struct pci_dev *dev);
extern void pci_iov_release(struct pci_dev *dev);