提交 09db8644 编写于 作者: A Alex Deucher 提交者: Christian König

drm/radeon: document VM functions in radeon_gart.c (v3)

Document the VM functions in radeon_gart.c

v2: adjust per Christian's suggestions
v3: adjust to Christians's latest changes
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
上级 03eec93b
......@@ -396,12 +396,40 @@ void radeon_gart_fini(struct radeon_device *rdev)
radeon_dummy_page_fini(rdev);
}
/*
* GPUVM
* GPUVM is similar to the legacy gart on older asics, however
* rather than there being a single global gart table
* for the entire GPU, there are multiple VM page tables active
* at any given time. The VM page tables can contain a mix
* vram pages and system memory pages and system memory pages
* can be mapped as snooped (cached system pages) or unsnooped
* (uncached system pages).
* Each VM has an ID associated with it and there is a page table
* associated with each VMID. When execting a command buffer,
* the kernel tells the the ring what VMID to use for that command
* buffer. VMIDs are allocated dynamically as commands are submitted.
* The userspace drivers maintain their own address space and the kernel
* sets up their pages tables accordingly when they submit their
* command buffers and a VMID is assigned.
* Cayman/Trinity support up to 8 active VMs at any given time;
* SI supports 16.
*/
/*
* vm helpers
*
* TODO bind a default page at vm initialization for default address
*/
/**
* radeon_vm_manager_init - init the vm manager
*
* @rdev: radeon_device pointer
*
* Init the vm manager (cayman+).
* Returns 0 for success, error for failure.
*/
int radeon_vm_manager_init(struct radeon_device *rdev)
{
struct radeon_vm *vm;
......@@ -456,6 +484,16 @@ int radeon_vm_manager_init(struct radeon_device *rdev)
}
/* global mutex must be lock */
/**
* radeon_vm_unbind_locked - unbind a specific vm
*
* @rdev: radeon_device pointer
* @vm: vm to unbind
*
* Unbind the requested vm (cayman+).
* Wait for use of the VM to finish, then unbind the page table,
* and free the page table memory.
*/
static void radeon_vm_unbind_locked(struct radeon_device *rdev,
struct radeon_vm *vm)
{
......@@ -495,6 +533,13 @@ static void radeon_vm_unbind_locked(struct radeon_device *rdev,
}
}
/**
* radeon_vm_manager_fini - tear down the vm manager
*
* @rdev: radeon_device pointer
*
* Tear down the VM manager (cayman+).
*/
void radeon_vm_manager_fini(struct radeon_device *rdev)
{
struct radeon_vm *vm, *tmp;
......@@ -516,6 +561,14 @@ void radeon_vm_manager_fini(struct radeon_device *rdev)
}
/* global mutex must be locked */
/**
* radeon_vm_unbind - locked version of unbind
*
* @rdev: radeon_device pointer
* @vm: vm to unbind
*
* Locked version that wraps radeon_vm_unbind_locked (cayman+).
*/
void radeon_vm_unbind(struct radeon_device *rdev, struct radeon_vm *vm)
{
mutex_lock(&vm->mutex);
......@@ -524,6 +577,18 @@ void radeon_vm_unbind(struct radeon_device *rdev, struct radeon_vm *vm)
}
/* global and local mutex must be locked */
/**
* radeon_vm_bind - bind a page table to a VMID
*
* @rdev: radeon_device pointer
* @vm: vm to bind
*
* Bind the requested vm (cayman+).
* Suballocate memory for the page table, allocate a VMID
* and bind the page table to it, and finally start to populate
* the page table.
* Returns 0 for success, error for failure.
*/
int radeon_vm_bind(struct radeon_device *rdev, struct radeon_vm *vm)
{
struct radeon_vm *vm_evict;
......@@ -586,6 +651,20 @@ int radeon_vm_bind(struct radeon_device *rdev, struct radeon_vm *vm)
}
/* object have to be reserved */
/**
* radeon_vm_bo_add - add a bo to a specific vm
*
* @rdev: radeon_device pointer
* @vm: requested vm
* @bo: radeon buffer object
* @offset: requested offset of the buffer in the VM address space
* @flags: attributes of pages (read/write/valid/etc.)
*
* Add @bo into the requested vm (cayman+).
* Add @bo to the list of bos associated with the vm and validate
* the offset requested within the vm address space.
* Returns 0 for success, error for failure.
*/
int radeon_vm_bo_add(struct radeon_device *rdev,
struct radeon_vm *vm,
struct radeon_bo *bo,
......@@ -663,6 +742,17 @@ int radeon_vm_bo_add(struct radeon_device *rdev,
return 0;
}
/**
* radeon_vm_get_addr - get the physical address of the page
*
* @rdev: radeon_device pointer
* @mem: ttm mem
* @pfn: pfn
*
* Look up the physical address of the page that the pte resolves
* to (cayman+).
* Returns the physical address of the page.
*/
static u64 radeon_vm_get_addr(struct radeon_device *rdev,
struct ttm_mem_reg *mem,
unsigned pfn)
......@@ -692,6 +782,17 @@ static u64 radeon_vm_get_addr(struct radeon_device *rdev,
}
/* object have to be reserved & global and local mutex must be locked */
/**
* radeon_vm_bo_update_pte - map a bo into the vm page table
*
* @rdev: radeon_device pointer
* @vm: requested vm
* @bo: radeon buffer object
* @mem: ttm mem
*
* Fill in the page table entries for @bo (cayman+).
* Returns 0 for success, -EINVAL for failure.
*/
int radeon_vm_bo_update_pte(struct radeon_device *rdev,
struct radeon_vm *vm,
struct radeon_bo *bo,
......@@ -740,6 +841,18 @@ int radeon_vm_bo_update_pte(struct radeon_device *rdev,
}
/* object have to be reserved */
/**
* radeon_vm_bo_rmv - remove a bo to a specific vm
*
* @rdev: radeon_device pointer
* @vm: requested vm
* @bo: radeon buffer object
*
* Remove @bo from the requested vm (cayman+).
* Remove @bo from the list of bos associated with the vm and
* remove the ptes for @bo in the page table.
* Returns 0 for success.
*/
int radeon_vm_bo_rmv(struct radeon_device *rdev,
struct radeon_vm *vm,
struct radeon_bo *bo)
......@@ -762,6 +875,15 @@ int radeon_vm_bo_rmv(struct radeon_device *rdev,
return 0;
}
/**
* radeon_vm_bo_invalidate - mark the bo as invalid
*
* @rdev: radeon_device pointer
* @vm: requested vm
* @bo: radeon buffer object
*
* Mark @bo as invalid (cayman+).
*/
void radeon_vm_bo_invalidate(struct radeon_device *rdev,
struct radeon_bo *bo)
{
......@@ -773,6 +895,17 @@ void radeon_vm_bo_invalidate(struct radeon_device *rdev,
}
}
/**
* radeon_vm_init - initialize a vm instance
*
* @rdev: radeon_device pointer
* @vm: requested vm
*
* Init @vm (cayman+).
* Map the IB pool and any other shared objects into the VM
* by default as it's used by all VMs.
* Returns 0 for success, error for failure.
*/
int radeon_vm_init(struct radeon_device *rdev, struct radeon_vm *vm)
{
int r;
......@@ -791,6 +924,15 @@ int radeon_vm_init(struct radeon_device *rdev, struct radeon_vm *vm)
return r;
}
/**
* radeon_vm_init - tear down a vm instance
*
* @rdev: radeon_device pointer
* @vm: requested vm
*
* Tear down @vm (cayman+).
* Unbind the VM and remove all bos from the vm bo list
*/
void radeon_vm_fini(struct radeon_device *rdev, struct radeon_vm *vm)
{
struct radeon_bo_va *bo_va, *tmp;
......
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