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drm: manager to keep track of GPUs VA mappings

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Add infrastructure to keep track of GPU virtual address (VA) mappings
with a decicated VA space manager implementation.

New UAPIs, motivated by Vulkan sparse memory bindings graphics drivers
start implementing, allow userspace applications to request multiple and
arbitrary GPU VA mappings of buffer objects. The DRM GPU VA manager is
intended to serve the following purposes in this context.

1) Provide infrastructure to track GPU VA allocations and mappings,
   using an interval tree (RB-tree).

2) Generically connect GPU VA mappings to their backing buffers, in
   particular DRM GEM objects.

3) Provide a common implementation to perform more complex mapping
   operations on the GPU VA space. In particular splitting and merging
   of GPU VA mappings, e.g. for intersecting mapping requests or partial
   unmap requests.

Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Acked-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Tested-by: Matthew Brost <matthew.brost@intel.com>
Tested-by: Donald Robson <donald.robson@imgtec.com>
Suggested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Danilo Krummrich <dakr@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230720001443.2380-2-dakr@redhat.com
This commit is contained in:
Danilo Krummrich 2023-07-20 02:14:22 +02:00
parent 41639b3a8b
commit e6303f323b
7 changed files with 2556 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
Documentation/gpu/drm-mm.rst
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@ -466,6 +466,42 @@ DRM MM Range Allocator Function References
.. kernel-doc:: drivers/gpu/drm/drm_mm.c
:export:
DRM GPU VA Manager
==================
Overview
--------
.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
:doc: Overview
Split and Merge
---------------
.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
:doc: Split and Merge
Locking
-------
.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
:doc: Locking
Examples
--------
.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
:doc: Examples
DRM GPU VA Manager Function References
--------------------------------------
.. kernel-doc:: include/drm/drm_gpuva_mgr.h
:internal:
.. kernel-doc:: drivers/gpu/drm/drm_gpuva_mgr.c
:export:
DRM Buddy Allocator
===================

1
drivers/gpu/drm/Makefile
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@ -45,6 +45,7 @@ drm-y := \
drm_vblank.o \
drm_vblank_work.o \
drm_vma_manager.o \
drm_gpuva_mgr.o \
drm_writeback.o
drm-$(CONFIG_DRM_LEGACY) += \
drm_agpsupport.o \

3
drivers/gpu/drm/drm_gem.c
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@ -164,6 +164,9 @@ void drm_gem_private_object_init(struct drm_device *dev,
if (!obj->resv)
obj->resv = &obj->_resv;
if (drm_core_check_feature(dev, DRIVER_GEM_GPUVA))
drm_gem_gpuva_init(obj);
drm_vma_node_reset(&obj->vma_node);
INIT_LIST_HEAD(&obj->lru_node);
}

1725
drivers/gpu/drm/drm_gpuva_mgr.c Normal file
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File diff suppressed because it is too large Load Diff

6
include/drm/drm_drv.h
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@ -104,6 +104,12 @@ enum drm_driver_feature {
* acceleration should be handled by two drivers that are connected using auxiliary bus.
*/
DRIVER_COMPUTE_ACCEL = BIT(7),
/**
* @DRIVER_GEM_GPUVA:
*
* Driver supports user defined GPU VA bindings for GEM objects.
*/
DRIVER_GEM_GPUVA = BIT(8),
/* IMPORTANT: Below are all the legacy flags, add new ones above. */

79
include/drm/drm_gem.h
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@ -36,6 +36,8 @@
#include <linux/kref.h>
#include <linux/dma-resv.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <drm/drm_vma_manager.h>
@ -379,6 +381,22 @@ struct drm_gem_object {
*/
struct dma_resv _resv;
/**
* @gpuva:
*
* Provides the list of GPU VAs attached to this GEM object.
*
* Drivers should lock list accesses with the GEMs &dma_resv lock
* (&drm_gem_object.resv) or a custom lock if one is provided.
*/
struct {
struct list_head list;
#ifdef CONFIG_LOCKDEP
struct lockdep_map *lock_dep_map;
#endif
} gpuva;
/**
* @funcs:
*
@ -526,4 +544,65 @@ unsigned long drm_gem_lru_scan(struct drm_gem_lru *lru,
int drm_gem_evict(struct drm_gem_object *obj);
#ifdef CONFIG_LOCKDEP
/**
* drm_gem_gpuva_set_lock() - Set the lock protecting accesses to the gpuva list.
* @obj: the &drm_gem_object
* @lock: the lock used to protect the gpuva list. The locking primitive
* must contain a dep_map field.
*
* Call this if you're not proctecting access to the gpuva list
* with the dma-resv lock, otherwise, drm_gem_gpuva_init() takes care
* of initializing lock_dep_map for you.
*/
#define drm_gem_gpuva_set_lock(obj, lock) \
if (!(obj)->gpuva.lock_dep_map) \
(obj)->gpuva.lock_dep_map = &(lock)->dep_map
#define drm_gem_gpuva_assert_lock_held(obj) \
lockdep_assert(lock_is_held((obj)->gpuva.lock_dep_map))
#else
#define drm_gem_gpuva_set_lock(obj, lock) do {} while (0)
#define drm_gem_gpuva_assert_lock_held(obj) do {} while (0)
#endif
/**
* drm_gem_gpuva_init() - initialize the gpuva list of a GEM object
* @obj: the &drm_gem_object
*
* This initializes the &drm_gem_object's &drm_gpuva list.
*
* Calling this function is only necessary for drivers intending to support the
* &drm_driver_feature DRIVER_GEM_GPUVA.
*/
static inline void drm_gem_gpuva_init(struct drm_gem_object *obj)
{
INIT_LIST_HEAD(&obj->gpuva.list);
drm_gem_gpuva_set_lock(obj, &obj->resv->lock.base);
}
/**
* drm_gem_for_each_gpuva() - iternator to walk over a list of gpuvas
* @entry__: &drm_gpuva structure to assign to in each iteration step
* @obj__: the &drm_gem_object the &drm_gpuvas to walk are associated with
*
* This iterator walks over all &drm_gpuva structures associated with the
* &drm_gpuva_manager.
*/
#define drm_gem_for_each_gpuva(entry__, obj__) \
list_for_each_entry(entry__, &(obj__)->gpuva.list, gem.entry)
/**
* drm_gem_for_each_gpuva_safe() - iternator to safely walk over a list of
* gpuvas
* @entry__: &drm_gpuva structure to assign to in each iteration step
* @next__: &next &drm_gpuva to store the next step
* @obj__: the &drm_gem_object the &drm_gpuvas to walk are associated with
*
* This iterator walks over all &drm_gpuva structures associated with the
* &drm_gem_object. It is implemented with list_for_each_entry_safe(), hence
* it is save against removal of elements.
*/
#define drm_gem_for_each_gpuva_safe(entry__, next__, obj__) \
list_for_each_entry_safe(entry__, next__, &(obj__)->gpuva.list, gem.entry)
#endif /* __DRM_GEM_H__ */

706
include/drm/drm_gpuva_mgr.h Normal file
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@ -0,0 +1,706 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __DRM_GPUVA_MGR_H__
#define __DRM_GPUVA_MGR_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/list.h>
#include <linux/rbtree.h>
#include <linux/types.h>
#include <drm/drm_gem.h>
struct drm_gpuva_manager;
struct drm_gpuva_fn_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_gpuva_manager.
*
* Typically, this structure is embedded in bigger driver structures.
*/
struct drm_gpuva {
/**
* @mgr: the &drm_gpuva_manager this object is associated with
*/
struct drm_gpuva_manager *mgr;
/**
* @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 {
/**
* @addr: the start address
*/
u64 addr;
/*
* @range: the range
*/
u64 range;
} va;
/**
* @gem: structure containing the &drm_gem_object and it's offset
*/
struct {
/**
* @offset: the offset within the &drm_gem_object
*/
u64 offset;
/**
* @obj: the mapped &drm_gem_object
*/
struct drm_gem_object *obj;
/**
* @entry: the &list_head to attach this object to a &drm_gem_object
*/
struct list_head entry;
} gem;
/**
* @rb: structure containing data to store &drm_gpuvas in a rb-tree
*/
struct {
/**
* @rb: the rb-tree node
*/
struct rb_node node;
/**
* @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;
/**
* @__subtree_last: needed by the interval tree, holding last-in-subtree
*/
u64 __subtree_last;
} rb;
};
int drm_gpuva_insert(struct drm_gpuva_manager *mgr, struct drm_gpuva *va);
void drm_gpuva_remove(struct drm_gpuva *va);
void drm_gpuva_link(struct drm_gpuva *va);
void drm_gpuva_unlink(struct drm_gpuva *va);
struct drm_gpuva *drm_gpuva_find(struct drm_gpuva_manager *mgr,
u64 addr, u64 range);
struct drm_gpuva *drm_gpuva_find_first(struct drm_gpuva_manager *mgr,
u64 addr, u64 range);
struct drm_gpuva *drm_gpuva_find_prev(struct drm_gpuva_manager *mgr, u64 start);
struct drm_gpuva *drm_gpuva_find_next(struct drm_gpuva_manager *mgr, u64 end);
bool drm_gpuva_interval_empty(struct drm_gpuva_manager *mgr, u64 addr, u64 range);
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
*/
static inline bool drm_gpuva_invalidated(struct drm_gpuva *va)
{
return va->flags & DRM_GPUVA_INVALIDATED;
}
/**
* struct drm_gpuva_manager - 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_gpuva_manager {
/**
* @name: the name of the DRM GPU VA space
*/
const char *name;
/**
* @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 {
/**
* @tree: the rb-tree to track GPU VA mappings
*/
struct rb_root_cached tree;
/**
* @list: the &list_head to track GPU VA mappings
*/
struct list_head list;
} rb;
/**
* @kernel_alloc_node:
*
* &drm_gpuva representing the address space cutout reserved for
* the kernel
*/
struct drm_gpuva kernel_alloc_node;
/**
* @ops: &drm_gpuva_fn_ops providing the split/merge steps to drivers
*/
const struct drm_gpuva_fn_ops *ops;
};
void drm_gpuva_manager_init(struct drm_gpuva_manager *mgr,
const char *name,
u64 start_offset, u64 range,
u64 reserve_offset, u64 reserve_range,
const struct drm_gpuva_fn_ops *ops);
void drm_gpuva_manager_destroy(struct drm_gpuva_manager *mgr);
static inline struct drm_gpuva *
__drm_gpuva_next(struct drm_gpuva *va)
{
if (va && !list_is_last(&va->rb.entry, &va->mgr->rb.list))
return list_next_entry(va, rb.entry);
return NULL;
}
/**
* drm_gpuva_for_each_va_range() - iterate over a range of &drm_gpuvas
* @va__: &drm_gpuva structure to assign to in each iteration step
* @mgr__: &drm_gpuva_manager 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_gpuva_manager that lie
* between @start__ and @end__. It is implemented similarly to list_for_each(),
* but is using the &drm_gpuva_manager'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_gpuva_manager. This iterator does not skip over the &drm_gpuva_manager's
* @kernel_alloc_node.
*/
#define drm_gpuva_for_each_va_range(va__, mgr__, start__, end__) \
for (va__ = drm_gpuva_find_first((mgr__), (start__), (end__) - (start__)); \
va__ && (va__->va.addr < (end__)); \
va__ = __drm_gpuva_next(va__))
/**
* drm_gpuva_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
* @mgr__: &drm_gpuva_manager 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_gpuva_manager that lie
* between @start__ and @end__. It is implemented similarly to
* list_for_each_safe(), but is using the &drm_gpuva_manager'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_gpuva_manager. This iterator does not skip over the
* &drm_gpuva_manager's @kernel_alloc_node.
*/
#define drm_gpuva_for_each_va_range_safe(va__, next__, mgr__, start__, end__) \
for (va__ = drm_gpuva_find_first((mgr__), (start__), (end__) - (start__)), \
next__ = __drm_gpuva_next(va__); \
va__ && (va__->va.addr < (end__)); \
va__ = next__, next__ = __drm_gpuva_next(va__))
/**
* drm_gpuva_for_each_va() - iterate over all &drm_gpuvas
* @va__: &drm_gpuva to assign to in each iteration step
* @mgr__: &drm_gpuva_manager to walk over
*
* This iterator walks over all &drm_gpuva structures associated with the given
* &drm_gpuva_manager.
*/
#define drm_gpuva_for_each_va(va__, mgr__) \
list_for_each_entry(va__, &(mgr__)->rb.list, rb.entry)
/**
* drm_gpuva_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
* @mgr__: &drm_gpuva_manager to walk over
*
* This iterator walks over all &drm_gpuva structures associated with the given
* &drm_gpuva_manager. It is implemented with list_for_each_entry_safe(), and
* hence safe against the removal of elements.
*/
#define drm_gpuva_for_each_va_safe(va__, next__, mgr__) \
list_for_each_entry_safe(va__, next__, &(mgr__)->rb.list, rb.entry)
/**
* enum drm_gpuva_op_type - GPU VA operation type
*
* Operations to alter the GPU VA mappings tracked by the &drm_gpuva_manager.
*/
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 {
/**
* @addr: the base address of the new mapping
*/
u64 addr;
/**
* @range: the range of the new mapping
*/
u64 range;
} va;
/**
* @gem: structure containing the &drm_gem_object and it's offset
*/
struct {
/**
* @offset: the offset within the &drm_gem_object
*/
u64 offset;
/**
* @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_gpuva_manager 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_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_gpuva_sm_map_ops_create(struct drm_gpuva_manager *mgr,
u64 addr, u64 range,
struct drm_gem_object *obj, u64 offset);
struct drm_gpuva_ops *
drm_gpuva_sm_unmap_ops_create(struct drm_gpuva_manager *mgr,
u64 addr, u64 range);
struct drm_gpuva_ops *
drm_gpuva_prefetch_ops_create(struct drm_gpuva_manager *mgr,
u64 addr, u64 range);
struct drm_gpuva_ops *
drm_gpuva_gem_unmap_ops_create(struct drm_gpuva_manager *mgr,
struct drm_gem_object *obj);
void drm_gpuva_ops_free(struct drm_gpuva_manager *mgr,
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_gpuva_fn_ops - callbacks for split/merge steps
*
* This structure defines the callbacks used by &drm_gpuva_sm_map and
* &drm_gpuva_sm_unmap to provide the split/merge steps for map and unmap
* operations to drivers.
*/
struct drm_gpuva_fn_ops {
/**
* @op_alloc: called when the &drm_gpuva_manager 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_gpuva_manager 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);
/**
* @sm_step_map: called from &drm_gpuva_sm_map to finally insert the
* mapping once all previous steps were completed
*
* The &priv pointer matches the one the driver passed to
* &drm_gpuva_sm_map or &drm_gpuva_sm_unmap, respectively.
*
* Can be NULL if &drm_gpuva_sm_map is used.
*/
int (*sm_step_map)(struct drm_gpuva_op *op, void *priv);
/**
* @sm_step_remap: called from &drm_gpuva_sm_map and
* &drm_gpuva_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_gpuva_sm_map or &drm_gpuva_sm_unmap, respectively.
*
* Can be NULL if neither &drm_gpuva_sm_map nor &drm_gpuva_sm_unmap is
* used.
*/
int (*sm_step_remap)(struct drm_gpuva_op *op, void *priv);
/**
* @sm_step_unmap: called from &drm_gpuva_sm_map and
* &drm_gpuva_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_gpuva_sm_map or &drm_gpuva_sm_unmap, respectively.
*
* Can be NULL if neither &drm_gpuva_sm_map nor &drm_gpuva_sm_unmap is
* used.
*/
int (*sm_step_unmap)(struct drm_gpuva_op *op, void *priv);
};
int drm_gpuva_sm_map(struct drm_gpuva_manager *mgr, void *priv,
u64 addr, u64 range,
struct drm_gem_object *obj, u64 offset);
int drm_gpuva_sm_unmap(struct drm_gpuva_manager *mgr, void *priv,
u64 addr, u64 range);
void drm_gpuva_map(struct drm_gpuva_manager *mgr,
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);
#endif /* __DRM_GPUVA_MGR_H__ */