diff options
Diffstat (limited to 'drivers/pci/ats.c')
| -rw-r--r-- | drivers/pci/ats.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index eeb9fb2b47aa..21264976fa13 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -153,6 +153,9 @@ int pci_enable_pri(struct pci_dev *pdev, u32 reqs) u32 max_requests; int pos; + if (WARN_ON(pdev->pri_enabled)) + return -EBUSY; + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); if (!pos) return -EINVAL; @@ -170,6 +173,8 @@ int pci_enable_pri(struct pci_dev *pdev, u32 reqs) control |= PCI_PRI_CTRL_ENABLE; pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); + pdev->pri_enabled = 1; + return 0; } EXPORT_SYMBOL_GPL(pci_enable_pri); @@ -185,6 +190,9 @@ void pci_disable_pri(struct pci_dev *pdev) u16 control; int pos; + if (WARN_ON(!pdev->pri_enabled)) + return; + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); if (!pos) return; @@ -192,6 +200,8 @@ void pci_disable_pri(struct pci_dev *pdev) pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control); control &= ~PCI_PRI_CTRL_ENABLE; pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control); + + pdev->pri_enabled = 0; } EXPORT_SYMBOL_GPL(pci_disable_pri); @@ -207,6 +217,9 @@ int pci_reset_pri(struct pci_dev *pdev) u16 control; int pos; + if (WARN_ON(pdev->pri_enabled)) + return -EBUSY; + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); if (!pos) return -EINVAL; @@ -239,6 +252,9 @@ int pci_enable_pasid(struct pci_dev *pdev, int features) u16 control, supported; int pos; + if (WARN_ON(pdev->pasid_enabled)) + return -EBUSY; + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); if (!pos) return -EINVAL; @@ -259,6 +275,8 @@ int pci_enable_pasid(struct pci_dev *pdev, int features) pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); + pdev->pasid_enabled = 1; + return 0; } EXPORT_SYMBOL_GPL(pci_enable_pasid); @@ -273,11 +291,16 @@ void pci_disable_pasid(struct pci_dev *pdev) u16 control = 0; int pos; + if (WARN_ON(!pdev->pasid_enabled)) + return; + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); if (!pos) return; pci_write_config_word(pdev, pos + PCI_PASID_CTRL, control); + + pdev->pasid_enabled = 0; } EXPORT_SYMBOL_GPL(pci_disable_pasid); |