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/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
#ifndef __DRM_GPUVM_H__
#define __DRM_GPUVM_H__
/*
* Copyright (c) 2022 Red Hat.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/dma-resv.h>
#include <linux/list.h>
#include <linux/rbtree.h>
#include <linux/types.h>
#include <drm/drm_device.h>
#include <drm/drm_gem.h>
#include <drm/drm_exec.h>
struct drm_gpuvm;
struct drm_gpuvm_bo;
struct drm_gpuvm_ops;
/**
* enum drm_gpuva_flags - flags for struct drm_gpuva
*/
enum drm_gpuva_flags {
/**
* @DRM_GPUVA_INVALIDATED:
*
* Flag indicating that the &drm_gpuva's backing GEM is invalidated.
*/
DRM_GPUVA_INVALIDATED = (1 << 0),
/**
* @DRM_GPUVA_SPARSE:
*
* Flag indicating that the &drm_gpuva is a sparse mapping.
*/
DRM_GPUVA_SPARSE = (1 << 1),
/**
* @DRM_GPUVA_USERBITS: user defined bits
*/
DRM_GPUVA_USERBITS = (1 << 2),
};
/**
* struct drm_gpuva - structure to track a GPU VA mapping
*
* This structure represents a GPU VA mapping and is associated with a
* &drm_gpuvm.
*
* Typically, this structure is embedded in bigger driver structures.
*/
struct drm_gpuva {
/**
* @vm: the &drm_gpuvm this object is associated with
*/
struct drm_gpuvm *vm;
/**
* @vm_bo: the &drm_gpuvm_bo abstraction for the mapped
* &drm_gem_object
*/
struct drm_gpuvm_bo *vm_bo;
/**
* @flags: the &drm_gpuva_flags for this mapping
*/
enum drm_gpuva_flags flags;
/**
* @va: structure containing the address and range of the &drm_gpuva
*/
struct {
/**
* @va.addr: the start address
*/
u64 addr;
/*
* @range: the range
*/
u64 range;
} va;
/**
* @gem: structure containing the &drm_gem_object and it's offset
*/
struct {
/**
* @gem.offset: the offset within the &drm_gem_object
*/
u64 offset;
/**
* @gem.obj: the mapped &drm_gem_object
*/
struct drm_gem_object *obj;
/**
* @gem.entry: the &list_head to attach this object to a &drm_gpuvm_bo
*/
struct list_head entry;
} gem;
/**
* @rb: structure containing data to store &drm_gpuvas in a rb-tree
*/
struct {
/**
* @rb.node: the rb-tree node
*/
struct rb_node node;
/**
* @rb.entry: The &list_head to additionally connect &drm_gpuvas
* in the same order they appear in the interval tree. This is
* useful to keep iterating &drm_gpuvas from a start node found
* through the rb-tree while doing modifications on the rb-tree
* itself.
*/
struct list_head entry;
/**
* @rb.__subtree_last: needed by the interval tree, holding last-in-subtree
*/
u64 __subtree_last;
} rb;
};
int drm_gpuva_insert(struct drm_gpuvm *gpuvm, struct drm_gpuva *va);
void drm_gpuva_remove(struct drm_gpuva *va);
void drm_gpuva_link(struct drm_gpuva *va, struct drm_gpuvm_bo *vm_bo);
void drm_gpuva_unlink(struct drm_gpuva *va);
struct drm_gpuva *drm_gpuva_find(struct drm_gpuvm *gpuvm,
u64 addr, u64 range);
struct drm_gpuva *drm_gpuva_find_first(struct drm_gpuvm *gpuvm,
u64 addr, u64 range);
struct drm_gpuva *drm_gpuva_find_prev(struct drm_gpuvm *gpuvm, u64 start);
struct drm_gpuva *drm_gpuva_find_next(struct drm_gpuvm *gpuvm, u64 end);
static inline void drm_gpuva_init(struct drm_gpuva *va, u64 addr, u64 range,
struct drm_gem_object *obj, u64 offset)
{
va->va.addr = addr;
va->va.range = range;
va->gem.obj = obj;
va->gem.offset = offset;
}
/**
* drm_gpuva_invalidate() - sets whether the backing GEM of this &drm_gpuva is
* invalidated
* @va: the &drm_gpuva to set the invalidate flag for
* @invalidate: indicates whether the &drm_gpuva is invalidated
*/
static inline void drm_gpuva_invalidate(struct drm_gpuva *va, bool invalidate)
{
if (invalidate)
va->flags |= DRM_GPUVA_INVALIDATED;
else
va->flags &= ~DRM_GPUVA_INVALIDATED;
}
/**
* drm_gpuva_invalidated() - indicates whether the backing BO of this &drm_gpuva
* is invalidated
* @va: the &drm_gpuva to check
*
* Returns: %true if the GPU VA is invalidated, %false otherwise
*/
static inline bool drm_gpuva_invalidated(struct drm_gpuva *va)
{
return va->flags & DRM_GPUVA_INVALIDATED;
}
/**
* enum drm_gpuvm_flags - flags for struct drm_gpuvm
*/
enum drm_gpuvm_flags {
/**
* @DRM_GPUVM_RESV_PROTECTED: GPUVM is protected externally by the
* GPUVM's &dma_resv lock
*/
DRM_GPUVM_RESV_PROTECTED = BIT(0),
/**
* @DRM_GPUVM_USERBITS: user defined bits
*/
DRM_GPUVM_USERBITS = BIT(1),
};
/**
* struct drm_gpuvm - DRM GPU VA Manager
*
* The DRM GPU VA Manager keeps track of a GPU's virtual address space by using
* &maple_tree structures. Typically, this structure is embedded in bigger
* driver structures.
*
* Drivers can pass addresses and ranges in an arbitrary unit, e.g. bytes or
* pages.
*
* There should be one manager instance per GPU virtual address space.
*/
struct drm_gpuvm {
/**
* @name: the name of the DRM GPU VA space
*/
const char *name;
/**
* @flags: the &drm_gpuvm_flags of this GPUVM
*/
enum drm_gpuvm_flags flags;
/**
* @drm: the &drm_device this VM lives in
*/
struct drm_device *drm;
/**
* @mm_start: start of the VA space
*/
u64 mm_start;
/**
* @mm_range: length of the VA space
*/
u64 mm_range;
/**
* @rb: structures to track &drm_gpuva entries
*/
struct {
/**
* @rb.tree: the rb-tree to track GPU VA mappings
*/
struct rb_root_cached tree;
/**
* @rb.list: the &list_head to track GPU VA mappings
*/
struct list_head list;
} rb;
/**
* @kref: reference count of this object
*/
struct kref kref;
/**
* @kernel_alloc_node:
*
* &drm_gpuva representing the address space cutout reserved for
* the kernel
*/
struct drm_gpuva kernel_alloc_node;
/**
* @ops: &drm_gpuvm_ops providing the split/merge steps to drivers
*/
const struct drm_gpuvm_ops *ops;
/**
* @r_obj: Resv GEM object; representing the GPUVM's common &dma_resv.
*/
struct drm_gem_object *r_obj;
/**
* @extobj: structure holding the extobj list
*/
struct {
/**
* @extobj.list: &list_head storing &drm_gpuvm_bos serving as
* external object
*/
struct list_head list;
/**
* @extobj.local_list: pointer to the local list temporarily
* storing entries from the external object list
*/
struct list_head *local_list;
/**
* @extobj.lock: spinlock to protect the extobj list
*/
spinlock_t lock;
} extobj;
/**
* @evict: structure holding the evict list and evict list lock
*/
struct {
/**
* @evict.list: &list_head storing &drm_gpuvm_bos currently
* being evicted
*/
struct list_head list;
/**
* @evict.local_list: pointer to the local list temporarily
* storing entries from the evicted object list
*/
struct list_head *local_list;
/**
* @evict.lock: spinlock to protect the evict list
*/
spinlock_t lock;
} evict;
};
void drm_gpuvm_init(struct drm_gpuvm *gpuvm, const char *name,
enum drm_gpuvm_flags flags,
struct drm_device *drm,
struct drm_gem_object *r_obj,
u64 start_offset, u64 range,
u64 reserve_offset, u64 reserve_range,
const struct drm_gpuvm_ops *ops);
/**
* drm_gpuvm_get() - acquire a struct drm_gpuvm reference
* @gpuvm: the &drm_gpuvm to acquire the reference of
*
* This function acquires an additional reference to @gpuvm. It is illegal to
* call this without already holding a reference. No locks required.
*
* Returns: the &struct drm_gpuvm pointer
*/
static inline struct drm_gpuvm *
drm_gpuvm_get(struct drm_gpuvm *gpuvm)
{
kref_get(&gpuvm->kref);
return gpuvm;
}
void drm_gpuvm_put(struct drm_gpuvm *gpuvm);
bool drm_gpuvm_range_valid(struct drm_gpuvm *gpuvm, u64 addr, u64 range);
bool drm_gpuvm_interval_empty(struct drm_gpuvm *gpuvm, u64 addr, u64 range);
struct drm_gem_object *
drm_gpuvm_resv_object_alloc(struct drm_device *drm);
/**
* drm_gpuvm_resv_protected() - indicates whether &DRM_GPUVM_RESV_PROTECTED is
* set
* @gpuvm: the &drm_gpuvm
*
* Returns: true if &DRM_GPUVM_RESV_PROTECTED is set, false otherwise.
*/
static inline bool
drm_gpuvm_resv_protected(struct drm_gpuvm *gpuvm)
{
return gpuvm->flags & DRM_GPUVM_RESV_PROTECTED;
}
/**
* drm_gpuvm_resv() - returns the &drm_gpuvm's &dma_resv
* @gpuvm__: the &drm_gpuvm
*
* Returns: a pointer to the &drm_gpuvm's shared &dma_resv
*/
#define drm_gpuvm_resv(gpuvm__) ((gpuvm__)->r_obj->resv)
/**
* drm_gpuvm_resv_obj() - returns the &drm_gem_object holding the &drm_gpuvm's
* &dma_resv
* @gpuvm__: the &drm_gpuvm
*
* Returns: a pointer to the &drm_gem_object holding the &drm_gpuvm's shared
* &dma_resv
*/
#define drm_gpuvm_resv_obj(gpuvm__) ((gpuvm__)->r_obj)
#define drm_gpuvm_resv_held(gpuvm__) \
dma_resv_held(drm_gpuvm_resv(gpuvm__))
#define drm_gpuvm_resv_assert_held(gpuvm__) \
dma_resv_assert_held(drm_gpuvm_resv(gpuvm__))
#define drm_gpuvm_resv_held(gpuvm__) \
dma_resv_held(drm_gpuvm_resv(gpuvm__))
#define drm_gpuvm_resv_assert_held(gpuvm__) \
dma_resv_assert_held(drm_gpuvm_resv(gpuvm__))
/**
* drm_gpuvm_is_extobj() - indicates whether the given &drm_gem_object is an
* external object
* @gpuvm: the &drm_gpuvm to check
* @obj: the &drm_gem_object to check
*
* Returns: true if the &drm_gem_object &dma_resv differs from the
* &drm_gpuvms &dma_resv, false otherwise
*/
static inline bool
drm_gpuvm_is_extobj(struct drm_gpuvm *gpuvm,
struct drm_gem_object *obj)
{
return obj && obj->resv != drm_gpuvm_resv(gpuvm);
}
static inline struct drm_gpuva *
__drm_gpuva_next(struct drm_gpuva *va)
{
if (va && !list_is_last(&va->rb.entry, &va->vm->rb.list))
return list_next_entry(va, rb.entry);
return NULL;
}
/**
* drm_gpuvm_for_each_va_range() - iterate over a range of &drm_gpuvas
* @va__: &drm_gpuva structure to assign to in each iteration step
* @gpuvm__: &drm_gpuvm to walk over
* @start__: starting offset, the first gpuva will overlap this
* @end__: ending offset, the last gpuva will start before this (but may
* overlap)
*
* This iterator walks over all &drm_gpuvas in the &drm_gpuvm that lie
* between @start__ and @end__. It is implemented similarly to list_for_each(),
* but is using the &drm_gpuvm's internal interval tree to accelerate
* the search for the starting &drm_gpuva, and hence isn't safe against removal
* of elements. It assumes that @end__ is within (or is the upper limit of) the
* &drm_gpuvm. This iterator does not skip over the &drm_gpuvm's
* @kernel_alloc_node.
*/
#define drm_gpuvm_for_each_va_range(va__, gpuvm__, start__, end__) \
for (va__ = drm_gpuva_find_first((gpuvm__), (start__), (end__) - (start__)); \
va__ && (va__->va.addr < (end__)); \
va__ = __drm_gpuva_next(va__))
/**
* drm_gpuvm_for_each_va_range_safe() - safely iterate over a range of
* &drm_gpuvas
* @va__: &drm_gpuva to assign to in each iteration step
* @next__: another &drm_gpuva to use as temporary storage
* @gpuvm__: &drm_gpuvm to walk over
* @start__: starting offset, the first gpuva will overlap this
* @end__: ending offset, the last gpuva will start before this (but may
* overlap)
*
* This iterator walks over all &drm_gpuvas in the &drm_gpuvm that lie
* between @start__ and @end__. It is implemented similarly to
* list_for_each_safe(), but is using the &drm_gpuvm's internal interval
* tree to accelerate the search for the starting &drm_gpuva, and hence is safe
* against removal of elements. It assumes that @end__ is within (or is the
* upper limit of) the &drm_gpuvm. This iterator does not skip over the
* &drm_gpuvm's @kernel_alloc_node.
*/
#define drm_gpuvm_for_each_va_range_safe(va__, next__, gpuvm__, start__, end__) \
for (va__ = drm_gpuva_find_first((gpuvm__), (start__), (end__) - (start__)), \
next__ = __drm_gpuva_next(va__); \
va__ && (va__->va.addr < (end__)); \
va__ = next__, next__ = __drm_gpuva_next(va__))
/**
* drm_gpuvm_for_each_va() - iterate over all &drm_gpuvas
* @va__: &drm_gpuva to assign to in each iteration step
* @gpuvm__: &drm_gpuvm to walk over
*
* This iterator walks over all &drm_gpuva structures associated with the given
* &drm_gpuvm.
*/
#define drm_gpuvm_for_each_va(va__, gpuvm__) \
list_for_each_entry(va__, &(gpuvm__)->rb.list, rb.entry)
/**
* drm_gpuvm_for_each_va_safe() - safely iterate over all &drm_gpuvas
* @va__: &drm_gpuva to assign to in each iteration step
* @next__: another &drm_gpuva to use as temporary storage
* @gpuvm__: &drm_gpuvm to walk over
*
* This iterator walks over all &drm_gpuva structures associated with the given
* &drm_gpuvm. It is implemented with list_for_each_entry_safe(), and
* hence safe against the removal of elements.
*/
#define drm_gpuvm_for_each_va_safe(va__, next__, gpuvm__) \
list_for_each_entry_safe(va__, next__, &(gpuvm__)->rb.list, rb.entry)
/**
* struct drm_gpuvm_exec - &drm_gpuvm abstraction of &drm_exec
*
* This structure should be created on the stack as &drm_exec should be.
*
* Optionally, @extra can be set in order to lock additional &drm_gem_objects.
*/
struct drm_gpuvm_exec {
/**
* @exec: the &drm_exec structure
*/
struct drm_exec exec;
/**
* @flags: the flags for the struct drm_exec
*/
uint32_t flags;
/**
* @vm: the &drm_gpuvm to lock its DMA reservations
*/
struct drm_gpuvm *vm;
/**
* @num_fences: the number of fences to reserve for the &dma_resv of the
* locked &drm_gem_objects
*/
unsigned int num_fences;
/**
* @extra: Callback and corresponding private data for the driver to
* lock arbitrary additional &drm_gem_objects.
*/
struct {
/**
* @extra.fn: The driver callback to lock additional
* &drm_gem_objects.
*/
int (*fn)(struct drm_gpuvm_exec *vm_exec);
/**
* @extra.priv: driver private data for the @fn callback
*/
void *priv;
} extra;
};
int drm_gpuvm_prepare_vm(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
unsigned int num_fences);
int drm_gpuvm_prepare_objects(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
unsigned int num_fences);
int drm_gpuvm_prepare_range(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
u64 addr, u64 range,
unsigned int num_fences);
int drm_gpuvm_exec_lock(struct drm_gpuvm_exec *vm_exec);
int drm_gpuvm_exec_lock_array(struct drm_gpuvm_exec *vm_exec,
struct drm_gem_object **objs,
unsigned int num_objs);
int drm_gpuvm_exec_lock_range(struct drm_gpuvm_exec *vm_exec,
u64 addr, u64 range);
/**
* drm_gpuvm_exec_unlock() - lock all dma-resv of all assoiciated BOs
* @vm_exec: the &drm_gpuvm_exec wrapper
*
* Releases all dma-resv locks of all &drm_gem_objects previously acquired
* through drm_gpuvm_exec_lock() or its variants.
*
* Returns: 0 on success, negative error code on failure.
*/
static inline void
drm_gpuvm_exec_unlock(struct drm_gpuvm_exec *vm_exec)
{
drm_exec_fini(&vm_exec->exec);
}
int drm_gpuvm_validate(struct drm_gpuvm *gpuvm, struct drm_exec *exec);
void drm_gpuvm_resv_add_fence(struct drm_gpuvm *gpuvm,
struct drm_exec *exec,
struct dma_fence *fence,
enum dma_resv_usage private_usage,
enum dma_resv_usage extobj_usage);
/**
* drm_gpuvm_exec_resv_add_fence() - add fence to private and all extobj
* @vm_exec: the &drm_gpuvm_exec wrapper
* @fence: fence to add
* @private_usage: private dma-resv usage
* @extobj_usage: extobj dma-resv usage
*
* See drm_gpuvm_resv_add_fence().
*/
static inline void
drm_gpuvm_exec_resv_add_fence(struct drm_gpuvm_exec *vm_exec,
struct dma_fence *fence,
enum dma_resv_usage private_usage,
enum dma_resv_usage extobj_usage)
{
drm_gpuvm_resv_add_fence(vm_exec->vm, &vm_exec->exec, fence,
private_usage, extobj_usage);
}
/**
* drm_gpuvm_exec_validate() - validate all BOs marked as evicted
* @vm_exec: the &drm_gpuvm_exec wrapper
*
* See drm_gpuvm_validate().
*
* Returns: 0 on success, negative error code on failure.
*/
static inline int
drm_gpuvm_exec_validate(struct drm_gpuvm_exec *vm_exec)
{
return drm_gpuvm_validate(vm_exec->vm, &vm_exec->exec);
}
/**
* struct drm_gpuvm_bo - structure representing a &drm_gpuvm and
* &drm_gem_object combination
*
* This structure is an abstraction representing a &drm_gpuvm and
* &drm_gem_object combination. It serves as an indirection to accelerate
* iterating all &drm_gpuvas within a &drm_gpuvm backed by the same
* &drm_gem_object.
*
* Furthermore it is used cache evicted GEM objects for a certain GPU-VM to
* accelerate validation.
*
* Typically, drivers want to create an instance of a struct drm_gpuvm_bo once
* a GEM object is mapped first in a GPU-VM and release the instance once the
* last mapping of the GEM object in this GPU-VM is unmapped.
*/
struct drm_gpuvm_bo {
/**
* @vm: The &drm_gpuvm the @obj is mapped in. This is a reference
* counted pointer.
*/
struct drm_gpuvm *vm;
/**
* @obj: The &drm_gem_object being mapped in @vm. This is a reference
* counted pointer.
*/
struct drm_gem_object *obj;
/**
* @evicted: Indicates whether the &drm_gem_object is evicted; field
* protected by the &drm_gem_object's dma-resv lock.
*/
bool evicted;
/**
* @kref: The reference count for this &drm_gpuvm_bo.
*/
struct kref kref;
/**
* @list: Structure containing all &list_heads.
*/
struct {
/**
* @list.gpuva: The list of linked &drm_gpuvas.
*
* It is safe to access entries from this list as long as the
* GEM's gpuva lock is held. See also struct drm_gem_object.
*/
struct list_head gpuva;
/**
* @list.entry: Structure containing all &list_heads serving as
* entry.
*/
struct {
/**
* @list.entry.gem: List entry to attach to the
* &drm_gem_objects gpuva list.
*/
struct list_head gem;
/**
* @list.entry.evict: List entry to attach to the
* &drm_gpuvms extobj list.
*/
struct list_head extobj;
/**
* @list.entry.evict: List entry to attach to the
* &drm_gpuvms evict list.
*/
struct list_head evict;
} entry;
} list;
};
struct drm_gpuvm_bo *
drm_gpuvm_bo_create(struct drm_gpuvm *gpuvm,
struct drm_gem_object *obj);
struct drm_gpuvm_bo *
drm_gpuvm_bo_obtain(struct drm_gpuvm *gpuvm,
struct drm_gem_object *obj);
struct drm_gpuvm_bo *
drm_gpuvm_bo_obtain_prealloc(struct drm_gpuvm_bo *vm_bo);
/**
* drm_gpuvm_bo_get() - acquire a struct drm_gpuvm_bo reference
* @vm_bo: the &drm_gpuvm_bo to acquire the reference of
*
* This function acquires an additional reference to @vm_bo. It is illegal to
* call this without already holding a reference. No locks required.
*
* Returns: the &struct vm_bo pointer
*/
static inline struct drm_gpuvm_bo *
drm_gpuvm_bo_get(struct drm_gpuvm_bo *vm_bo)
{
kref_get(&vm_bo->kref);
return vm_bo;
}
bool drm_gpuvm_bo_put(struct drm_gpuvm_bo *vm_bo);
struct drm_gpuvm_bo *
drm_gpuvm_bo_find(struct drm_gpuvm *gpuvm,
struct drm_gem_object *obj);
void drm_gpuvm_bo_evict(struct drm_gpuvm_bo *vm_bo, bool evict);
/**
* drm_gpuvm_bo_gem_evict() - add/remove all &drm_gpuvm_bo's in the list
* to/from the &drm_gpuvms evicted list
* @obj: the &drm_gem_object
* @evict: indicates whether @obj is evicted
*
* See drm_gpuvm_bo_evict().
*/
static inline void
drm_gpuvm_bo_gem_evict(struct drm_gem_object *obj, bool evict)
{
struct drm_gpuvm_bo *vm_bo;
drm_gem_gpuva_assert_lock_held(obj);
drm_gem_for_each_gpuvm_bo(vm_bo, obj)
drm_gpuvm_bo_evict(vm_bo, evict);
}
void drm_gpuvm_bo_extobj_add(struct drm_gpuvm_bo *vm_bo);
/**
* drm_gpuvm_bo_for_each_va() - iterator to walk over a list of &drm_gpuva
* @va__: &drm_gpuva structure to assign to in each iteration step
* @vm_bo__: the &drm_gpuvm_bo the &drm_gpuva to walk are associated with
*
* This iterator walks over all &drm_gpuva structures associated with the
* &drm_gpuvm_bo.
*
* The caller must hold the GEM's gpuva lock.
*/
#define drm_gpuvm_bo_for_each_va(va__, vm_bo__) \
list_for_each_entry(va__, &(vm_bo)->list.gpuva, gem.entry)
/**
* drm_gpuvm_bo_for_each_va_safe() - iterator to safely walk over a list of
* &drm_gpuva
* @va__: &drm_gpuva structure to assign to in each iteration step
* @next__: &next &drm_gpuva to store the next step
* @vm_bo__: the &drm_gpuvm_bo the &drm_gpuva to walk are associated with
*
* This iterator walks over all &drm_gpuva structures associated with the
* &drm_gpuvm_bo. It is implemented with list_for_each_entry_safe(), hence
* it is save against removal of elements.
*
* The caller must hold the GEM's gpuva lock.
*/
#define drm_gpuvm_bo_for_each_va_safe(va__, next__, vm_bo__) \
list_for_each_entry_safe(va__, next__, &(vm_bo)->list.gpuva, gem.entry)
/**
* enum drm_gpuva_op_type - GPU VA operation type
*
* Operations to alter the GPU VA mappings tracked by the &drm_gpuvm.
*/
enum drm_gpuva_op_type {
/**
* @DRM_GPUVA_OP_MAP: the map op type
*/
DRM_GPUVA_OP_MAP,
/**
* @DRM_GPUVA_OP_REMAP: the remap op type
*/
DRM_GPUVA_OP_REMAP,
/**
* @DRM_GPUVA_OP_UNMAP: the unmap op type
*/
DRM_GPUVA_OP_UNMAP,
/**
* @DRM_GPUVA_OP_PREFETCH: the prefetch op type
*/
DRM_GPUVA_OP_PREFETCH,
};
/**
* struct drm_gpuva_op_map - GPU VA map operation
*
* This structure represents a single map operation generated by the
* DRM GPU VA manager.
*/
struct drm_gpuva_op_map {
/**
* @va: structure containing address and range of a map
* operation
*/
struct {
/**
* @va.addr: the base address of the new mapping
*/
u64 addr;
/**
* @va.range: the range of the new mapping
*/
u64 range;
} va;
/**
* @gem: structure containing the &drm_gem_object and it's offset
*/
struct {
/**
* @gem.offset: the offset within the &drm_gem_object
*/
u64 offset;
/**
* @gem.obj: the &drm_gem_object to map
*/
struct drm_gem_object *obj;
} gem;
};
/**
* struct drm_gpuva_op_unmap - GPU VA unmap operation
*
* This structure represents a single unmap operation generated by the
* DRM GPU VA manager.
*/
struct drm_gpuva_op_unmap {
/**
* @va: the &drm_gpuva to unmap
*/
struct drm_gpuva *va;
/**
* @keep:
*
* Indicates whether this &drm_gpuva is physically contiguous with the
* original mapping request.
*
* Optionally, if &keep is set, drivers may keep the actual page table
* mappings for this &drm_gpuva, adding the missing page table entries
* only and update the &drm_gpuvm accordingly.
*/
bool keep;
};
/**
* struct drm_gpuva_op_remap - GPU VA remap operation
*
* This represents a single remap operation generated by the DRM GPU VA manager.
*
* A remap operation is generated when an existing GPU VA mmapping is split up
* by inserting a new GPU VA mapping or by partially unmapping existent
* mapping(s), hence it consists of a maximum of two map and one unmap
* operation.
*
* The @unmap operation takes care of removing the original existing mapping.
* @prev is used to remap the preceding part, @next the subsequent part.
*
* If either a new mapping's start address is aligned with the start address
* of the old mapping or the new mapping's end address is aligned with the
* end address of the old mapping, either @prev or @next is NULL.
*
* Note, the reason for a dedicated remap operation, rather than arbitrary
* unmap and map operations, is to give drivers the chance of extracting driver
* specific data for creating the new mappings from the unmap operations's
* &drm_gpuva structure which typically is embedded in larger driver specific
* structures.
*/
struct drm_gpuva_op_remap {
/**
* @prev: the preceding part of a split mapping
*/
struct drm_gpuva_op_map *prev;
/**
* @next: the subsequent part of a split mapping
*/
struct drm_gpuva_op_map *next;
/**
* @unmap: the unmap operation for the original existing mapping
*/
struct drm_gpuva_op_unmap *unmap;
};
/**
* struct drm_gpuva_op_prefetch - GPU VA prefetch operation
*
* This structure represents a single prefetch operation generated by the
* DRM GPU VA manager.
*/
struct drm_gpuva_op_prefetch {
/**
* @va: the &drm_gpuva to prefetch
*/
struct drm_gpuva *va;
};
/**
* struct drm_gpuva_op - GPU VA operation
*
* This structure represents a single generic operation.
*
* The particular type of the operation is defined by @op.
*/
struct drm_gpuva_op {
/**
* @entry:
*
* The &list_head used to distribute instances of this struct within
* &drm_gpuva_ops.
*/
struct list_head entry;
/**
* @op: the type of the operation
*/
enum drm_gpuva_op_type op;
union {
/**
* @map: the map operation
*/
struct drm_gpuva_op_map map;
/**
* @remap: the remap operation
*/
struct drm_gpuva_op_remap remap;
/**
* @unmap: the unmap operation
*/
struct drm_gpuva_op_unmap unmap;
/**
* @prefetch: the prefetch operation
*/
struct drm_gpuva_op_prefetch prefetch;
};
};
/**
* struct drm_gpuva_ops - wraps a list of &drm_gpuva_op
*/
struct drm_gpuva_ops {
/**
* @list: the &list_head
*/
struct list_head list;
};
/**
* drm_gpuva_for_each_op() - iterator to walk over &drm_gpuva_ops
* @op: &drm_gpuva_op to assign in each iteration step
* @ops: &drm_gpuva_ops to walk
*
* This iterator walks over all ops within a given list of operations.
*/
#define drm_gpuva_for_each_op(op, ops) list_for_each_entry(op, &(ops)->list, entry)
/**
* drm_gpuva_for_each_op_safe() - iterator to safely walk over &drm_gpuva_ops
* @op: &drm_gpuva_op to assign in each iteration step
* @next: &next &drm_gpuva_op to store the next step
* @ops: &drm_gpuva_ops to walk
*
* This iterator walks over all ops within a given list of operations. It is
* implemented with list_for_each_safe(), so save against removal of elements.
*/
#define drm_gpuva_for_each_op_safe(op, next, ops) \
list_for_each_entry_safe(op, next, &(ops)->list, entry)
/**
* drm_gpuva_for_each_op_from_reverse() - iterate backwards from the given point
* @op: &drm_gpuva_op to assign in each iteration step
* @ops: &drm_gpuva_ops to walk
*
* This iterator walks over all ops within a given list of operations beginning
* from the given operation in reverse order.
*/
#define drm_gpuva_for_each_op_from_reverse(op, ops) \
list_for_each_entry_from_reverse(op, &(ops)->list, entry)
/**
* drm_gpuva_for_each_op_reverse - iterator to walk over &drm_gpuva_ops in reverse
* @op: &drm_gpuva_op to assign in each iteration step
* @ops: &drm_gpuva_ops to walk
*
* This iterator walks over all ops within a given list of operations in reverse
*/
#define drm_gpuva_for_each_op_reverse(op, ops) \
list_for_each_entry_reverse(op, &(ops)->list, entry)
/**
* drm_gpuva_first_op() - returns the first &drm_gpuva_op from &drm_gpuva_ops
* @ops: the &drm_gpuva_ops to get the fist &drm_gpuva_op from
*/
#define drm_gpuva_first_op(ops) \
list_first_entry(&(ops)->list, struct drm_gpuva_op, entry)
/**
* drm_gpuva_last_op() - returns the last &drm_gpuva_op from &drm_gpuva_ops
* @ops: the &drm_gpuva_ops to get the last &drm_gpuva_op from
*/
#define drm_gpuva_last_op(ops) \
list_last_entry(&(ops)->list, struct drm_gpuva_op, entry)
/**
* drm_gpuva_prev_op() - previous &drm_gpuva_op in the list
* @op: the current &drm_gpuva_op
*/
#define drm_gpuva_prev_op(op) list_prev_entry(op, entry)
/**
* drm_gpuva_next_op() - next &drm_gpuva_op in the list
* @op: the current &drm_gpuva_op
*/
#define drm_gpuva_next_op(op) list_next_entry(op, entry)
struct drm_gpuva_ops *
drm_gpuvm_sm_map_ops_create(struct drm_gpuvm *gpuvm,
u64 addr, u64 range,
struct drm_gem_object *obj, u64 offset);
struct drm_gpuva_ops *
drm_gpuvm_sm_unmap_ops_create(struct drm_gpuvm *gpuvm,
u64 addr, u64 range);
struct drm_gpuva_ops *
drm_gpuvm_prefetch_ops_create(struct drm_gpuvm *gpuvm,
u64 addr, u64 range);
struct drm_gpuva_ops *
drm_gpuvm_bo_unmap_ops_create(struct drm_gpuvm_bo *vm_bo);
void drm_gpuva_ops_free(struct drm_gpuvm *gpuvm,
struct drm_gpuva_ops *ops);
static inline void drm_gpuva_init_from_op(struct drm_gpuva *va,
struct drm_gpuva_op_map *op)
{
drm_gpuva_init(va, op->va.addr, op->va.range,
op->gem.obj, op->gem.offset);
}
/**
* struct drm_gpuvm_ops - callbacks for split/merge steps
*
* This structure defines the callbacks used by &drm_gpuvm_sm_map and
* &drm_gpuvm_sm_unmap to provide the split/merge steps for map and unmap
* operations to drivers.
*/
struct drm_gpuvm_ops {
/**
* @vm_free: called when the last reference of a struct drm_gpuvm is
* dropped
*
* This callback is mandatory.
*/
void (*vm_free)(struct drm_gpuvm *gpuvm);
/**
* @op_alloc: called when the &drm_gpuvm allocates
* a struct drm_gpuva_op
*
* Some drivers may want to embed struct drm_gpuva_op into driver
* specific structures. By implementing this callback drivers can
* allocate memory accordingly.
*
* This callback is optional.
*/
struct drm_gpuva_op *(*op_alloc)(void);
/**
* @op_free: called when the &drm_gpuvm frees a
* struct drm_gpuva_op
*
* Some drivers may want to embed struct drm_gpuva_op into driver
* specific structures. By implementing this callback drivers can
* free the previously allocated memory accordingly.
*
* This callback is optional.
*/
void (*op_free)(struct drm_gpuva_op *op);
/**
* @vm_bo_alloc: called when the &drm_gpuvm allocates
* a struct drm_gpuvm_bo
*
* Some drivers may want to embed struct drm_gpuvm_bo into driver
* specific structures. By implementing this callback drivers can
* allocate memory accordingly.
*
* This callback is optional.
*/
struct drm_gpuvm_bo *(*vm_bo_alloc)(void);
/**
* @vm_bo_free: called when the &drm_gpuvm frees a
* struct drm_gpuvm_bo
*
* Some drivers may want to embed struct drm_gpuvm_bo into driver
* specific structures. By implementing this callback drivers can
* free the previously allocated memory accordingly.
*
* This callback is optional.
*/
void (*vm_bo_free)(struct drm_gpuvm_bo *vm_bo);
/**
* @vm_bo_validate: called from drm_gpuvm_validate()
*
* Drivers receive this callback for every evicted &drm_gem_object being
* mapped in the corresponding &drm_gpuvm.
*
* Typically, drivers would call their driver specific variant of
* ttm_bo_validate() from within this callback.
*/
int (*vm_bo_validate)(struct drm_gpuvm_bo *vm_bo,
struct drm_exec *exec);
/**
* @sm_step_map: called from &drm_gpuvm_sm_map to finally insert the
* mapping once all previous steps were completed
*
* The &priv pointer matches the one the driver passed to
* &drm_gpuvm_sm_map or &drm_gpuvm_sm_unmap, respectively.
*
* Can be NULL if &drm_gpuvm_sm_map is used.
*/
int (*sm_step_map)(struct drm_gpuva_op *op, void *priv);
/**
* @sm_step_remap: called from &drm_gpuvm_sm_map and
* &drm_gpuvm_sm_unmap to split up an existent mapping
*
* This callback is called when existent mapping needs to be split up.
* This is the case when either a newly requested mapping overlaps or
* is enclosed by an existent mapping or a partial unmap of an existent
* mapping is requested.
*
* The &priv pointer matches the one the driver passed to
* &drm_gpuvm_sm_map or &drm_gpuvm_sm_unmap, respectively.
*
* Can be NULL if neither &drm_gpuvm_sm_map nor &drm_gpuvm_sm_unmap is
* used.
*/
int (*sm_step_remap)(struct drm_gpuva_op *op, void *priv);
/**
* @sm_step_unmap: called from &drm_gpuvm_sm_map and
* &drm_gpuvm_sm_unmap to unmap an existent mapping
*
* This callback is called when existent mapping needs to be unmapped.
* This is the case when either a newly requested mapping encloses an
* existent mapping or an unmap of an existent mapping is requested.
*
* The &priv pointer matches the one the driver passed to
* &drm_gpuvm_sm_map or &drm_gpuvm_sm_unmap, respectively.
*
* Can be NULL if neither &drm_gpuvm_sm_map nor &drm_gpuvm_sm_unmap is
* used.
*/
int (*sm_step_unmap)(struct drm_gpuva_op *op, void *priv);
};
int drm_gpuvm_sm_map(struct drm_gpuvm *gpuvm, void *priv,
u64 addr, u64 range,
struct drm_gem_object *obj, u64 offset);
int drm_gpuvm_sm_unmap(struct drm_gpuvm *gpuvm, void *priv,
u64 addr, u64 range);
void drm_gpuva_map(struct drm_gpuvm *gpuvm,
struct drm_gpuva *va,
struct drm_gpuva_op_map *op);
void drm_gpuva_remap(struct drm_gpuva *prev,
struct drm_gpuva *next,
struct drm_gpuva_op_remap *op);
void drm_gpuva_unmap(struct drm_gpuva_op_unmap *op);
/**
* drm_gpuva_op_remap_to_unmap_range() - Helper to get the start and range of
* the unmap stage of a remap op.
* @op: Remap op.
* @start_addr: Output pointer for the start of the required unmap.
* @range: Output pointer for the length of the required unmap.
*
* The given start address and range will be set such that they represent the
* range of the address space that was previously covered by the mapping being
* re-mapped, but is now empty.
*/
static inline void
drm_gpuva_op_remap_to_unmap_range(const struct drm_gpuva_op_remap *op,
u64 *start_addr, u64 *range)
{
const u64 va_start = op->prev ?
op->prev->va.addr + op->prev->va.range :
op->unmap->va->va.addr;
const u64 va_end = op->next ?
op->next->va.addr :
op->unmap->va->va.addr + op->unmap->va->va.range;
if (start_addr)
*start_addr = va_start;
if (range)
*range = va_end - va_start;
}
#endif /* __DRM_GPUVM_H__ */
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