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/*
* Copyright 2020 Advanced Micro Devices, Inc.
*
* 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.
*
* Authors: Christian König
*/
#ifndef _TTM_RESOURCE_H_
#define _TTM_RESOURCE_H_
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/dma-buf-map.h>
#include <linux/dma-fence.h>
#include <drm/drm_print.h>
#include <drm/ttm/ttm_caching.h>
#include <drm/ttm/ttm_kmap_iter.h>
#define TTM_MAX_BO_PRIORITY 4U
struct ttm_device;
struct ttm_resource_manager;
struct ttm_resource;
struct ttm_place;
struct ttm_buffer_object;
struct dma_buf_map;
struct io_mapping;
struct sg_table;
struct scatterlist;
struct ttm_resource_manager_func {
/**
* struct ttm_resource_manager_func member alloc
*
* @man: Pointer to a memory type manager.
* @bo: Pointer to the buffer object we're allocating space for.
* @place: Placement details.
* @res: Resulting pointer to the ttm_resource.
*
* This function should allocate space in the memory type managed
* by @man. Placement details if applicable are given by @place. If
* successful, a filled in ttm_resource object should be returned in
* @res. @res::start should be set to a value identifying the beginning
* of the range allocated, and the function should return zero.
* If the manager can't fulfill the request -ENOSPC should be returned.
* If a system error occurred, preventing the request to be fulfilled,
* the function should return a negative error code.
*
* This function may not be called from within atomic context and needs
* to take care of its own locking to protect any data structures
* managing the space.
*/
int (*alloc)(struct ttm_resource_manager *man,
struct ttm_buffer_object *bo,
const struct ttm_place *place,
struct ttm_resource **res);
/**
* struct ttm_resource_manager_func member free
*
* @man: Pointer to a memory type manager.
* @res: Pointer to a struct ttm_resource to be freed.
*
* This function frees memory type resources previously allocated.
* May not be called from within atomic context.
*/
void (*free)(struct ttm_resource_manager *man,
struct ttm_resource *res);
/**
* struct ttm_resource_manager_func member debug
*
* @man: Pointer to a memory type manager.
* @printer: Prefix to be used in printout to identify the caller.
*
* This function is called to print out the state of the memory
* type manager to aid debugging of out-of-memory conditions.
* It may not be called from within atomic context.
*/
void (*debug)(struct ttm_resource_manager *man,
struct drm_printer *printer);
};
/**
* struct ttm_resource_manager
*
* @use_type: The memory type is enabled.
* @flags: TTM_MEMTYPE_XX flags identifying the traits of the memory
* managed by this memory type.
* @gpu_offset: If used, the GPU offset of the first managed page of
* fixed memory or the first managed location in an aperture.
* @size: Size of the managed region.
* @func: structure pointer implementing the range manager. See above
* @move_lock: lock for move fence
* static information. bdev::driver::io_mem_free is never used.
* @lru: The lru list for this memory type.
* @move: The fence of the last pipelined move operation.
*
* This structure is used to identify and manage memory types for a device.
*/
struct ttm_resource_manager {
/*
* No protection. Constant from start.
*/
bool use_type;
bool use_tt;
uint64_t size;
const struct ttm_resource_manager_func *func;
spinlock_t move_lock;
/*
* Protected by the global->lru_lock.
*/
struct list_head lru[TTM_MAX_BO_PRIORITY];
/*
* Protected by @move_lock.
*/
struct dma_fence *move;
};
/**
* struct ttm_bus_placement
*
* @addr: mapped virtual address
* @offset: physical addr
* @is_iomem: is this io memory ?
*
* Structure indicating the bus placement of an object.
*/
struct ttm_bus_placement {
void *addr;
phys_addr_t offset;
bool is_iomem;
enum ttm_caching caching;
};
/**
* struct ttm_resource
*
* @start: Start of the allocation.
* @num_pages: Actual size of resource in pages.
* @mem_type: Resource type of the allocation.
* @placement: Placement flags.
* @bus: Placement on io bus accessible to the CPU
*
* Structure indicating the placement and space resources used by a
* buffer object.
*/
struct ttm_resource {
unsigned long start;
unsigned long num_pages;
uint32_t mem_type;
uint32_t placement;
struct ttm_bus_placement bus;
};
/**
* struct ttm_kmap_iter_iomap - Specialization for a struct io_mapping +
* struct sg_table backed struct ttm_resource.
* @base: Embedded struct ttm_kmap_iter providing the usage interface.
* @iomap: struct io_mapping representing the underlying linear io_memory.
* @st: sg_table into @iomap, representing the memory of the struct ttm_resource.
* @start: Offset that needs to be subtracted from @st to make
* sg_dma_address(st->sgl) - @start == 0 for @iomap start.
* @cache: Scatterlist traversal cache for fast lookups.
* @cache.sg: Pointer to the currently cached scatterlist segment.
* @cache.i: First index of @sg. PAGE_SIZE granularity.
* @cache.end: Last index + 1 of @sg. PAGE_SIZE granularity.
* @cache.offs: First offset into @iomap of @sg. PAGE_SIZE granularity.
*/
struct ttm_kmap_iter_iomap {
struct ttm_kmap_iter base;
struct io_mapping *iomap;
struct sg_table *st;
resource_size_t start;
struct {
struct scatterlist *sg;
pgoff_t i;
pgoff_t end;
pgoff_t offs;
} cache;
};
/**
* struct ttm_kmap_iter_linear_io - Iterator specialization for linear io
* @base: The base iterator
* @dmap: Points to the starting address of the region
* @needs_unmap: Whether we need to unmap on fini
*/
struct ttm_kmap_iter_linear_io {
struct ttm_kmap_iter base;
struct dma_buf_map dmap;
bool needs_unmap;
};
/**
* ttm_resource_manager_set_used
*
* @man: A memory manager object.
* @used: usage state to set.
*
* Set the manager in use flag. If disabled the manager is no longer
* used for object placement.
*/
static inline void
ttm_resource_manager_set_used(struct ttm_resource_manager *man, bool used)
{
int i;
for (i = 0; i < TTM_MAX_BO_PRIORITY; i++)
WARN_ON(!list_empty(&man->lru[i]));
man->use_type = used;
}
/**
* ttm_resource_manager_used
*
* @man: Manager to get used state for
*
* Get the in use flag for a manager.
* Returns:
* true is used, false if not.
*/
static inline bool ttm_resource_manager_used(struct ttm_resource_manager *man)
{
return man->use_type;
}
/**
* ttm_resource_manager_cleanup
*
* @man: A memory manager object.
*
* Cleanup the move fences from the memory manager object.
*/
static inline void
ttm_resource_manager_cleanup(struct ttm_resource_manager *man)
{
dma_fence_put(man->move);
man->move = NULL;
}
void ttm_resource_init(struct ttm_buffer_object *bo,
const struct ttm_place *place,
struct ttm_resource *res);
int ttm_resource_alloc(struct ttm_buffer_object *bo,
const struct ttm_place *place,
struct ttm_resource **res);
void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res);
void ttm_resource_manager_init(struct ttm_resource_manager *man,
unsigned long p_size);
int ttm_resource_manager_evict_all(struct ttm_device *bdev,
struct ttm_resource_manager *man);
void ttm_resource_manager_debug(struct ttm_resource_manager *man,
struct drm_printer *p);
struct ttm_kmap_iter *
ttm_kmap_iter_iomap_init(struct ttm_kmap_iter_iomap *iter_io,
struct io_mapping *iomap,
struct sg_table *st,
resource_size_t start);
struct ttm_kmap_iter_linear_io;
struct ttm_kmap_iter *
ttm_kmap_iter_linear_io_init(struct ttm_kmap_iter_linear_io *iter_io,
struct ttm_device *bdev,
struct ttm_resource *mem);
void ttm_kmap_iter_linear_io_fini(struct ttm_kmap_iter_linear_io *iter_io,
struct ttm_device *bdev,
struct ttm_resource *mem);
#endif
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