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hv: vtd: add structure and API docs

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This patch adds more comments to describe the structures and functions of vtd
that are public to the other components in the hypervisor. The comments are in
doxygen-style for document generation.

Tracked-On: #1595
Signed-off-by: Binbin Wu <binbin.wu@intel.com>
This commit is contained in:
Binbin Wu 2018-10-31 13:23:04 +08:00 committed by David Kinder
parent 7dc3e609be
commit 1776d7e7fc
1 changed files with 127 additions and 9 deletions
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136
hypervisor/include/arch/x86/vtd.h
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@ -465,37 +465,155 @@ struct dmar_info {
extern struct dmar_info *get_dmar_info(void);
/**
* @file vtd.h
*
* @brief public APIs for VT-d
*/
/**
* @brief VT-d
*
* @defgroup acrn_vtd ACRN VT-d
* @{
*/
/**
* @brief iommu domain.
*
* This struct declaration for iommu domain.
*
*/
struct iommu_domain;
/* Assign a device specified by bus & devfun to a iommu domain */
/**
* @brief Assign a device specified by bus & devfun to a iommu domain.
*
* Remove the device from the VM0 domain (if present), and add it to the specific domain.
*
* @param[in] domain iommu domain the device is assigned to
* @param[in] bus the 8-bit bus number of the device
* @param[in] devfun the 8-bit device(5-bit):function(3-bit) of the device
*
* @return 0 - on success.
* @return 1 - fail to unassign the device
*
* @pre domain != NULL
*
*/
int assign_iommu_device(const struct iommu_domain *domain,
uint8_t bus, uint8_t devfun);
/* Unassign a device specified by bus & devfun to a iommu domain */
/**
* @brief Unassign a device specified by bus & devfun from a iommu domain .
*
* Remove the device from the specific domain, and then add it to the VM0 domain (if present).
*
* @param[in] domain iommu domain the device is assigned to
* @param[in] bus the 8-bit bus number of the device
* @param[in] devfun the 8-bit device(5-bit):function(3-bit) of the device
*
* @return 0 - on success.
* @return 1 - fail to unassign the device
*
* @pre domain != NULL
*
*/
int unassign_iommu_device(const struct iommu_domain *domain,
uint8_t bus, uint8_t devfun);
/* Create a iommu domain for a VM specified by vm_id */
/**
* @brief Create a iommu domain for a VM specified by vm_id.
*
* Create a iommu domain for a VM specified by vm_id, along with address translation table and address width.
*
* @param[in] vm_id vm_id of the VM the domain created for
* @param[in] translation_table the physcial address of EPT table of the VM specified by the vm_id
* @param[in] addr_width address width of the VM
*
* @return Pointer pointer to iommu_domain
* @return NULL if translation_table is 0
*
* @pre vm_id is valid
* @pre translation_table != 0
*
*/
struct iommu_domain *create_iommu_domain(uint16_t vm_id,
uint64_t translation_table, uint32_t addr_width);
/* Destroy the iommu domain */
/**
* @brief Destroy the specific iommu domain.
*
* Destroy the specific iommu domain when a VM no longer needs it.
*
* @param[in] domain iommu domain to destroy
*
* @pre domain != NULL
*
*/
void destroy_iommu_domain(struct iommu_domain *domain);
/* Enable translation of iommu*/
/**
* @brief Enable translation of IOMMUs.
*
* Enable address translation of all IOMMUs, which are not ignored on the platform.
*
*/
void enable_iommu(void);
/* Disable translation of iommu*/
/**
* @brief Disable translation of IOMMUs.
*
* Disable address translation of all IOMMUs, which are not ignored on the platform.
*
*/
void disable_iommu(void);
/* suspend iomu */
/**
* @brief Suspend IOMMUs.
*
* Suspend all IOMMUs, which are not ignored on the platform.
*
*/
void suspend_iommu(void);
/* resume iomu */
/**
* @brief Resume IOMMUs.
*
* Resume all IOMMUs, which are not ignored on the platform.
*
*/
void resume_iommu(void);
/* iommu initialization */
/**
* @brief Init IOMMUs.
*
* Register DMAR units on the platform according to the pre-parsed information or DMAR table.
*
* @return 0 - on success
* @return non-zero - iommu is a must have feature, if init_iommu failed, the system should not continue booting
*
*/
int init_iommu(void);
/**
* @brief Init VM0 domain of iommu.
*
* Create VM0 domain using the Normal World's EPT table of VM0 as address translation table.
* All PCI devices are added to the VM0 domain when creating it.
*
* @param[in] vm0 pointer to VM0
*
* @pre vm0 shall point to VM0
*
* @remark to reduce boot time & memory cost, a config IOMMU_INIT_BUS_LIMIT, which limit the bus number.
*
*/
void init_iommu_vm0_domain(struct vm *vm0);
/**
* @}
*/
#endif