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* Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com>
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* Copyright (C) 2011 Advanced Micro Devices,
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* PCI Express I/O Virtualization (IOV) support.
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* Address Translation Service 1.0
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* Page Request Interface added by Joerg Roedel <joerg.roedel@amd.com>
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* PASID support added by Joerg Roedel <joerg.roedel@amd.com>
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#include <linux/export.h>
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#include <linux/pci-ats.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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static int ats_alloc_one(struct pci_dev *dev, int ps)
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
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ats = kzalloc(sizeof(*ats), GFP_KERNEL);
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pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
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ats->qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
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static void ats_free_one(struct pci_dev *dev)
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* pci_enable_ats - enable the ATS capability
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* @dev: the PCI device
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* @ps: the IOMMU page shift
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* Returns 0 on success, or negative on failure.
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int pci_enable_ats(struct pci_dev *dev, int ps)
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BUG_ON(dev->ats && dev->ats->is_enabled);
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if (ps < PCI_ATS_MIN_STU)
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if (dev->is_physfn || dev->is_virtfn) {
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struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
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mutex_lock(&pdev->sriov->lock);
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rc = pdev->ats->stu == ps ? 0 : -EINVAL;
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rc = ats_alloc_one(pdev, ps);
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mutex_unlock(&pdev->sriov->lock);
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if (!dev->is_physfn) {
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rc = ats_alloc_one(dev, ps);
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ctrl = PCI_ATS_CTRL_ENABLE;
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ctrl |= PCI_ATS_CTRL_STU(ps - PCI_ATS_MIN_STU);
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pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
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dev->ats->is_enabled = 1;
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EXPORT_SYMBOL_GPL(pci_enable_ats);
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* pci_disable_ats - disable the ATS capability
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* @dev: the PCI device
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void pci_disable_ats(struct pci_dev *dev)
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BUG_ON(!dev->ats || !dev->ats->is_enabled);
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pci_read_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, &ctrl);
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ctrl &= ~PCI_ATS_CTRL_ENABLE;
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pci_write_config_word(dev, dev->ats->pos + PCI_ATS_CTRL, ctrl);
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dev->ats->is_enabled = 0;
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if (dev->is_physfn || dev->is_virtfn) {
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struct pci_dev *pdev = dev->is_physfn ? dev : dev->physfn;
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mutex_lock(&pdev->sriov->lock);
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pdev->ats->ref_cnt--;
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if (!pdev->ats->ref_cnt)
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mutex_unlock(&pdev->sriov->lock);
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EXPORT_SYMBOL_GPL(pci_disable_ats);
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* pci_ats_queue_depth - query the ATS Invalidate Queue Depth
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* @dev: the PCI device
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* Returns the queue depth on success, or negative on failure.
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* The ATS spec uses 0 in the Invalidate Queue Depth field to
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* indicate that the function can accept 32 Invalidate Request.
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* But here we use the `real' values (i.e. 1~32) for the Queue
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* Depth; and 0 indicates the function shares the Queue with
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* other functions (doesn't exclusively own a Queue).
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int pci_ats_queue_depth(struct pci_dev *dev)
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return dev->ats->qdep;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
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pci_read_config_word(dev, pos + PCI_ATS_CAP, &cap);
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return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
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EXPORT_SYMBOL_GPL(pci_ats_queue_depth);
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#ifdef CONFIG_PCI_PRI
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* pci_enable_pri - Enable PRI capability
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* @ pdev: PCI device structure
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* Returns 0 on success, negative value on error
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int pci_enable_pri(struct pci_dev *pdev, u32 reqs)
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pos = pci_find_ext_capability(pdev, PCI_PRI_CAP);
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pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
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pci_read_config_word(pdev, pos + PCI_PRI_STATUS_OFF, &status);
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if ((control & PCI_PRI_ENABLE) || !(status & PCI_PRI_STATUS_STOPPED))
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pci_read_config_dword(pdev, pos + PCI_PRI_MAX_REQ_OFF, &max_requests);
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reqs = min(max_requests, reqs);
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pci_write_config_dword(pdev, pos + PCI_PRI_ALLOC_REQ_OFF, reqs);
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control |= PCI_PRI_ENABLE;
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pci_write_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, control);
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EXPORT_SYMBOL_GPL(pci_enable_pri);
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* pci_disable_pri - Disable PRI capability
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* @pdev: PCI device structure
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* Only clears the enabled-bit, regardless of its former value
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void pci_disable_pri(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PRI_CAP);
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pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
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control &= ~PCI_PRI_ENABLE;
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pci_write_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, control);
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EXPORT_SYMBOL_GPL(pci_disable_pri);
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* pci_pri_enabled - Checks if PRI capability is enabled
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* @pdev: PCI device structure
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* Returns true if PRI is enabled on the device, false otherwise
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bool pci_pri_enabled(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PRI_CAP);
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pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
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return (control & PCI_PRI_ENABLE) ? true : false;
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EXPORT_SYMBOL_GPL(pci_pri_enabled);
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* pci_reset_pri - Resets device's PRI state
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* @pdev: PCI device structure
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* The PRI capability must be disabled before this function is called.
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* Returns 0 on success, negative value on error.
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int pci_reset_pri(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PRI_CAP);
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pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
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if (control & PCI_PRI_ENABLE)
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control |= PCI_PRI_RESET;
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pci_write_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, control);
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EXPORT_SYMBOL_GPL(pci_reset_pri);
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* pci_pri_stopped - Checks whether the PRI capability is stopped
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* @pdev: PCI device structure
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* Returns true if the PRI capability on the device is disabled and the
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* device has no outstanding PRI requests, false otherwise. The device
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* indicates this via the STOPPED bit in the status register of the
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* The device internal state can be cleared by resetting the PRI state
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* with pci_reset_pri(). This can force the capability into the STOPPED
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bool pci_pri_stopped(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PRI_CAP);
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pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
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pci_read_config_word(pdev, pos + PCI_PRI_STATUS_OFF, &status);
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if (control & PCI_PRI_ENABLE)
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return (status & PCI_PRI_STATUS_STOPPED) ? true : false;
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EXPORT_SYMBOL_GPL(pci_pri_stopped);
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* pci_pri_status - Request PRI status of a device
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* @pdev: PCI device structure
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* Returns negative value on failure, status on success. The status can
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* be checked against status-bits. Supported bits are currently:
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* PCI_PRI_STATUS_RF: Response failure
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* PCI_PRI_STATUS_UPRGI: Unexpected Page Request Group Index
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* PCI_PRI_STATUS_STOPPED: PRI has stopped
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int pci_pri_status(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PRI_CAP);
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pci_read_config_word(pdev, pos + PCI_PRI_CONTROL_OFF, &control);
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pci_read_config_word(pdev, pos + PCI_PRI_STATUS_OFF, &status);
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/* Stopped bit is undefined when enable == 1, so clear it */
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if (control & PCI_PRI_ENABLE)
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status &= ~PCI_PRI_STATUS_STOPPED;
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EXPORT_SYMBOL_GPL(pci_pri_status);
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#endif /* CONFIG_PCI_PRI */
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#ifdef CONFIG_PCI_PASID
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* pci_enable_pasid - Enable the PASID capability
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* @pdev: PCI device structure
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* @features: Features to enable
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* Returns 0 on success, negative value on error. This function checks
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* whether the features are actually supported by the device and returns
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int pci_enable_pasid(struct pci_dev *pdev, int features)
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u16 control, supported;
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pos = pci_find_ext_capability(pdev, PCI_PASID_CAP);
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pci_read_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, &control);
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pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
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if (!(supported & PCI_PASID_ENABLE))
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supported &= PCI_PASID_EXEC | PCI_PASID_PRIV;
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/* User wants to enable anything unsupported? */
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if ((supported & features) != features)
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control = PCI_PASID_ENABLE | features;
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pci_write_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, control);
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EXPORT_SYMBOL_GPL(pci_enable_pasid);
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* pci_disable_pasid - Disable the PASID capability
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* @pdev: PCI device structure
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void pci_disable_pasid(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PASID_CAP);
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pci_write_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, control);
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EXPORT_SYMBOL_GPL(pci_disable_pasid);
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* pci_pasid_features - Check which PASID features are supported
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* @pdev: PCI device structure
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* Returns a negative value when no PASI capability is present.
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* Otherwise is returns a bitmask with supported features. Current
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* features reported are:
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* PCI_PASID_ENABLE - PASID capability can be enabled
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* PCI_PASID_EXEC - Execute permission supported
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* PCI_PASID_PRIV - Priviledged mode supported
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int pci_pasid_features(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PASID_CAP);
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pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
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supported &= PCI_PASID_ENABLE | PCI_PASID_EXEC | PCI_PASID_PRIV;
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EXPORT_SYMBOL_GPL(pci_pasid_features);
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#define PASID_NUMBER_SHIFT 8
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#define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT)
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* pci_max_pasid - Get maximum number of PASIDs supported by device
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* @pdev: PCI device structure
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* Returns negative value when PASID capability is not present.
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* Otherwise it returns the numer of supported PASIDs.
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int pci_max_pasids(struct pci_dev *pdev)
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pos = pci_find_ext_capability(pdev, PCI_PASID_CAP);
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pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported);
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supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT;
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return (1 << supported);
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EXPORT_SYMBOL_GPL(pci_max_pasids);
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#endif /* CONFIG_PCI_PASID */