From: Alex Deucher <alexander.deucher@xxxxxxx>
Document the VM functions in radeon_gart.c
v2: adjust per Christian's suggestions
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_gart.c | 159 ++++++++++++++++++++++++++++++++++
1 files changed, 159 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_gart.c b/drivers/gpu/drm/radeon/radeon_gart.c
index f6a9dab..2b842ba 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -397,10 +397,38 @@ void radeon_gart_fini(struct radeon_device *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)
{
int r;
@@ -426,6 +454,16 @@ 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)
{
@@ -454,6 +492,13 @@ 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)
{
if (rdev->vm_manager.sa_manager.bo == NULL)
@@ -464,6 +509,14 @@ void radeon_vm_manager_fini(struct radeon_device *rdev)
rdev->vm_manager.enabled = false;
}
+/**
+ * radeon_vm_manager_start - start the vm manager
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Start the suballocator instance used for VM (cayman+).
+ * Returns 0 for success, error for failure.
+ */
int radeon_vm_manager_start(struct radeon_device *rdev)
{
if (rdev->vm_manager.sa_manager.bo == NULL) {
@@ -472,6 +525,15 @@ int radeon_vm_manager_start(struct radeon_device *rdev)
return radeon_sa_bo_manager_start(rdev, &rdev->vm_manager.sa_manager);
}
+/**
+ * radeon_vm_manager_suspend - suspend the vm manager
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Unbind all the VM page tables and suspend the suballocator
+ * instance used for VM (cayman+).
+ * Returns 0 for success, error for failure.
+ */
int radeon_vm_manager_suspend(struct radeon_device *rdev)
{
struct radeon_vm *vm, *tmp;
@@ -487,6 +549,14 @@ int radeon_vm_manager_suspend(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);
@@ -495,6 +565,18 @@ 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;
@@ -557,6 +639,20 @@ retry_id:
}
/* 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,
@@ -634,6 +730,17 @@ 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)
@@ -663,6 +770,17 @@ 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,
@@ -711,6 +829,18 @@ 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)
@@ -733,6 +863,15 @@ 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)
{
@@ -744,6 +883,17 @@ 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;
@@ -770,6 +920,15 @@ 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;
--
1.7.7.5
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