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iommu/amd: Implement device aquisition code for IOMMUv2

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This patch adds the amd_iommu_init_device() and
amd_iommu_free_device() functions which make a device and
the IOMMU ready for IOMMUv2 usage.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2011-11-23 17:30:39 +01:00
parent e3c495c74b
commit ed96f228ba
2 changed files with 232 additions and 1 deletions
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23
include/linux/amd-iommu.h
View file

@ -20,10 +20,12 @@
#ifndef _ASM_X86_AMD_IOMMU_H
#define _ASM_X86_AMD_IOMMU_H
#include <linux/irqreturn.h>
#include <linux/types.h>
#ifdef CONFIG_AMD_IOMMU
struct pci_dev;
extern int amd_iommu_detect(void);
@ -33,6 +35,7 @@ extern int amd_iommu_detect(void);
* @pdev: The PCI device the workaround is necessary for
* @erratum: The erratum workaround to enable
*
* The function needs to be called before amd_iommu_init_device().
* Possible values for the erratum number are for now:
* - AMD_PRI_DEV_ERRATUM_ENABLE_RESET - Reset PRI capability when PRI
* is enabled
@ -44,6 +47,24 @@ extern int amd_iommu_detect(void);
extern void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum);
/**
* amd_iommu_init_device() - Init device for use with IOMMUv2 driver
* @pdev: The PCI device to initialize
* @pasids: Number of PASIDs to support for this device
*
* This function does all setup for the device pdev so that it can be
* used with IOMMUv2.
* Returns 0 on success or negative value on error.
*/
extern int amd_iommu_init_device(struct pci_dev *pdev, int pasids);
/**
* amd_iommu_free_device() - Free all IOMMUv2 related device resources
* and disable IOMMUv2 usage for this device
* @pdev: The PCI device to disable IOMMUv2 usage for'
*/
extern void amd_iommu_free_device(struct pci_dev *pdev);
#else
static inline int amd_iommu_detect(void) { return -ENODEV; }