forked from KolibriOS/kolibrios
712 lines
22 KiB
C
712 lines
22 KiB
C
/**************************************************************************
|
|
*
|
|
* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
|
|
* All Rights Reserved.
|
|
*
|
|
* 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, sub license, 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 (including the
|
|
* next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL
|
|
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
|
|
*/
|
|
|
|
#ifndef _TTM_BO_API_H_
|
|
#define _TTM_BO_API_H_
|
|
|
|
#include <drm/drm_hashtab.h>
|
|
#include <drm/drm_vma_manager.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/list.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/bitmap.h>
|
|
|
|
struct ttm_bo_device;
|
|
|
|
struct drm_mm_node;
|
|
|
|
struct reservation_object {
|
|
struct mutex lock;
|
|
};
|
|
|
|
|
|
/**
|
|
* struct ttm_placement
|
|
*
|
|
* @fpfn: first valid page frame number to put the object
|
|
* @lpfn: last valid page frame number to put the object
|
|
* @num_placement: number of preferred placements
|
|
* @placement: preferred placements
|
|
* @num_busy_placement: number of preferred placements when need to evict buffer
|
|
* @busy_placement: preferred placements when need to evict buffer
|
|
*
|
|
* Structure indicating the placement you request for an object.
|
|
*/
|
|
struct ttm_placement {
|
|
unsigned fpfn;
|
|
unsigned lpfn;
|
|
unsigned num_placement;
|
|
const uint32_t *placement;
|
|
unsigned num_busy_placement;
|
|
const uint32_t *busy_placement;
|
|
};
|
|
|
|
/**
|
|
* struct ttm_bus_placement
|
|
*
|
|
* @addr: mapped virtual address
|
|
* @base: bus base address
|
|
* @is_iomem: is this io memory ?
|
|
* @size: size in byte
|
|
* @offset: offset from the base address
|
|
* @io_reserved_vm: The VM system has a refcount in @io_reserved_count
|
|
* @io_reserved_count: Refcounting the numbers of callers to ttm_mem_io_reserve
|
|
*
|
|
* Structure indicating the bus placement of an object.
|
|
*/
|
|
struct ttm_bus_placement {
|
|
void *addr;
|
|
unsigned long base;
|
|
unsigned long size;
|
|
unsigned long offset;
|
|
bool is_iomem;
|
|
bool io_reserved_vm;
|
|
uint64_t io_reserved_count;
|
|
};
|
|
|
|
|
|
/**
|
|
* struct ttm_mem_reg
|
|
*
|
|
* @mm_node: Memory manager node.
|
|
* @size: Requested size of memory region.
|
|
* @num_pages: Actual size of memory region in pages.
|
|
* @page_alignment: Page alignment.
|
|
* @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_mem_reg {
|
|
void *mm_node;
|
|
unsigned long start;
|
|
unsigned long size;
|
|
unsigned long num_pages;
|
|
uint32_t page_alignment;
|
|
uint32_t mem_type;
|
|
uint32_t placement;
|
|
struct ttm_bus_placement bus;
|
|
};
|
|
|
|
/**
|
|
* enum ttm_bo_type
|
|
*
|
|
* @ttm_bo_type_device: These are 'normal' buffers that can
|
|
* be mmapped by user space. Each of these bos occupy a slot in the
|
|
* device address space, that can be used for normal vm operations.
|
|
*
|
|
* @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers,
|
|
* but they cannot be accessed from user-space. For kernel-only use.
|
|
*
|
|
* @ttm_bo_type_sg: Buffer made from dmabuf sg table shared with another
|
|
* driver.
|
|
*/
|
|
|
|
enum ttm_bo_type {
|
|
ttm_bo_type_device,
|
|
ttm_bo_type_kernel,
|
|
ttm_bo_type_sg
|
|
};
|
|
|
|
struct ttm_tt;
|
|
|
|
/**
|
|
* struct ttm_buffer_object
|
|
*
|
|
* @bdev: Pointer to the buffer object device structure.
|
|
* @type: The bo type.
|
|
* @destroy: Destruction function. If NULL, kfree is used.
|
|
* @num_pages: Actual number of pages.
|
|
* @acc_size: Accounted size for this object.
|
|
* @kref: Reference count of this buffer object. When this refcount reaches
|
|
* zero, the object is put on the delayed delete list.
|
|
* @list_kref: List reference count of this buffer object. This member is
|
|
* used to avoid destruction while the buffer object is still on a list.
|
|
* Lru lists may keep one refcount, the delayed delete list, and kref != 0
|
|
* keeps one refcount. When this refcount reaches zero,
|
|
* the object is destroyed.
|
|
* @mem: structure describing current placement.
|
|
* @persistent_swap_storage: Usually the swap storage is deleted for buffers
|
|
* pinned in physical memory. If this behaviour is not desired, this member
|
|
* holds a pointer to a persistent shmem object.
|
|
* @ttm: TTM structure holding system pages.
|
|
* @evicted: Whether the object was evicted without user-space knowing.
|
|
* @cpu_writes: For synchronization. Number of cpu writers.
|
|
* @lru: List head for the lru list.
|
|
* @ddestroy: List head for the delayed destroy list.
|
|
* @swap: List head for swap LRU list.
|
|
* @sync_obj: Pointer to a synchronization object.
|
|
* @priv_flags: Flags describing buffer object internal state.
|
|
* @vma_node: Address space manager node.
|
|
* @offset: The current GPU offset, which can have different meanings
|
|
* depending on the memory type. For SYSTEM type memory, it should be 0.
|
|
* @cur_placement: Hint of current placement.
|
|
* @wu_mutex: Wait unreserved mutex.
|
|
*
|
|
* Base class for TTM buffer object, that deals with data placement and CPU
|
|
* mappings. GPU mappings are really up to the driver, but for simpler GPUs
|
|
* the driver can usually use the placement offset @offset directly as the
|
|
* GPU virtual address. For drivers implementing multiple
|
|
* GPU memory manager contexts, the driver should manage the address space
|
|
* in these contexts separately and use these objects to get the correct
|
|
* placement and caching for these GPU maps. This makes it possible to use
|
|
* these objects for even quite elaborate memory management schemes.
|
|
* The destroy member, the API visibility of this object makes it possible
|
|
* to derive driver specific types.
|
|
*/
|
|
|
|
struct ttm_buffer_object {
|
|
/**
|
|
* Members constant at init.
|
|
*/
|
|
|
|
struct ttm_bo_global *glob;
|
|
struct ttm_bo_device *bdev;
|
|
enum ttm_bo_type type;
|
|
void (*destroy) (struct ttm_buffer_object *);
|
|
unsigned long num_pages;
|
|
size_t acc_size;
|
|
|
|
/**
|
|
* Members not needing protection.
|
|
*/
|
|
|
|
struct kref kref;
|
|
struct kref list_kref;
|
|
|
|
/**
|
|
* Members protected by the bo::resv::reserved lock.
|
|
*/
|
|
|
|
struct ttm_mem_reg mem;
|
|
struct file *persistent_swap_storage;
|
|
struct ttm_tt *ttm;
|
|
bool evicted;
|
|
|
|
/**
|
|
* Members protected by the bo::reserved lock only when written to.
|
|
*/
|
|
|
|
atomic_t cpu_writers;
|
|
|
|
/**
|
|
* Members protected by the bdev::lru_lock.
|
|
*/
|
|
|
|
struct list_head lru;
|
|
struct list_head ddestroy;
|
|
struct list_head swap;
|
|
struct list_head io_reserve_lru;
|
|
|
|
/**
|
|
* Members protected by struct buffer_object_device::fence_lock
|
|
* In addition, setting sync_obj to anything else
|
|
* than NULL requires bo::reserved to be held. This allows for
|
|
* checking NULL while reserved but not holding the mentioned lock.
|
|
*/
|
|
|
|
void *sync_obj;
|
|
unsigned long priv_flags;
|
|
|
|
struct drm_vma_offset_node vma_node;
|
|
|
|
/**
|
|
* Special members that are protected by the reserve lock
|
|
* and the bo::lock when written to. Can be read with
|
|
* either of these locks held.
|
|
*/
|
|
|
|
unsigned long offset;
|
|
uint32_t cur_placement;
|
|
|
|
struct sg_table *sg;
|
|
|
|
struct reservation_object *resv;
|
|
struct reservation_object ttm_resv;
|
|
struct mutex wu_mutex;
|
|
};
|
|
|
|
/**
|
|
* struct ttm_bo_kmap_obj
|
|
*
|
|
* @virtual: The current kernel virtual address.
|
|
* @page: The page when kmap'ing a single page.
|
|
* @bo_kmap_type: Type of bo_kmap.
|
|
*
|
|
* Object describing a kernel mapping. Since a TTM bo may be located
|
|
* in various memory types with various caching policies, the
|
|
* mapping can either be an ioremap, a vmap, a kmap or part of a
|
|
* premapped region.
|
|
*/
|
|
|
|
#define TTM_BO_MAP_IOMEM_MASK 0x80
|
|
struct ttm_bo_kmap_obj {
|
|
void *virtual;
|
|
struct page *page;
|
|
enum {
|
|
ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK,
|
|
ttm_bo_map_vmap = 2,
|
|
ttm_bo_map_kmap = 3,
|
|
ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK,
|
|
} bo_kmap_type;
|
|
struct ttm_buffer_object *bo;
|
|
};
|
|
|
|
/**
|
|
* ttm_bo_reference - reference a struct ttm_buffer_object
|
|
*
|
|
* @bo: The buffer object.
|
|
*
|
|
* Returns a refcounted pointer to a buffer object.
|
|
*/
|
|
|
|
static inline struct ttm_buffer_object *
|
|
ttm_bo_reference(struct ttm_buffer_object *bo)
|
|
{
|
|
kref_get(&bo->kref);
|
|
return bo;
|
|
}
|
|
|
|
/**
|
|
* ttm_bo_wait - wait for buffer idle.
|
|
*
|
|
* @bo: The buffer object.
|
|
* @interruptible: Use interruptible wait.
|
|
* @no_wait: Return immediately if buffer is busy.
|
|
*
|
|
* This function must be called with the bo::mutex held, and makes
|
|
* sure any previous rendering to the buffer is completed.
|
|
* Note: It might be necessary to block validations before the
|
|
* wait by reserving the buffer.
|
|
* Returns -EBUSY if no_wait is true and the buffer is busy.
|
|
* Returns -ERESTARTSYS if interrupted by a signal.
|
|
*/
|
|
extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy,
|
|
bool interruptible, bool no_wait);
|
|
/**
|
|
* ttm_bo_validate
|
|
*
|
|
* @bo: The buffer object.
|
|
* @placement: Proposed placement for the buffer object.
|
|
* @interruptible: Sleep interruptible if sleeping.
|
|
* @no_wait_gpu: Return immediately if the GPU is busy.
|
|
*
|
|
* Changes placement and caching policy of the buffer object
|
|
* according proposed placement.
|
|
* Returns
|
|
* -EINVAL on invalid proposed placement.
|
|
* -ENOMEM on out-of-memory condition.
|
|
* -EBUSY if no_wait is true and buffer busy.
|
|
* -ERESTARTSYS if interrupted by a signal.
|
|
*/
|
|
extern int ttm_bo_validate(struct ttm_buffer_object *bo,
|
|
struct ttm_placement *placement,
|
|
bool interruptible,
|
|
bool no_wait_gpu);
|
|
|
|
/**
|
|
* ttm_bo_unref
|
|
*
|
|
* @bo: The buffer object.
|
|
*
|
|
* Unreference and clear a pointer to a buffer object.
|
|
*/
|
|
extern void ttm_bo_unref(struct ttm_buffer_object **bo);
|
|
|
|
|
|
/**
|
|
* ttm_bo_list_ref_sub
|
|
*
|
|
* @bo: The buffer object.
|
|
* @count: The number of references with which to decrease @bo::list_kref;
|
|
* @never_free: The refcount should not reach zero with this operation.
|
|
*
|
|
* Release @count lru list references to this buffer object.
|
|
*/
|
|
extern void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
|
|
bool never_free);
|
|
|
|
/**
|
|
* ttm_bo_add_to_lru
|
|
*
|
|
* @bo: The buffer object.
|
|
*
|
|
* Add this bo to the relevant mem type lru and, if it's backed by
|
|
* system pages (ttms) to the swap list.
|
|
* This function must be called with struct ttm_bo_global::lru_lock held, and
|
|
* is typically called immediately prior to unreserving a bo.
|
|
*/
|
|
extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo);
|
|
|
|
/**
|
|
* ttm_bo_del_from_lru
|
|
*
|
|
* @bo: The buffer object.
|
|
*
|
|
* Remove this bo from all lru lists used to lookup and reserve an object.
|
|
* This function must be called with struct ttm_bo_global::lru_lock held,
|
|
* and is usually called just immediately after the bo has been reserved to
|
|
* avoid recursive reservation from lru lists.
|
|
*/
|
|
extern int ttm_bo_del_from_lru(struct ttm_buffer_object *bo);
|
|
|
|
|
|
/**
|
|
* ttm_bo_lock_delayed_workqueue
|
|
*
|
|
* Prevent the delayed workqueue from running.
|
|
* Returns
|
|
* True if the workqueue was queued at the time
|
|
*/
|
|
extern int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev);
|
|
|
|
/**
|
|
* ttm_bo_unlock_delayed_workqueue
|
|
*
|
|
* Allows the delayed workqueue to run.
|
|
*/
|
|
extern void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev,
|
|
int resched);
|
|
|
|
/**
|
|
* ttm_bo_synccpu_write_grab
|
|
*
|
|
* @bo: The buffer object:
|
|
* @no_wait: Return immediately if buffer is busy.
|
|
*
|
|
* Synchronizes a buffer object for CPU RW access. This means
|
|
* command submission that affects the buffer will return -EBUSY
|
|
* until ttm_bo_synccpu_write_release is called.
|
|
*
|
|
* Returns
|
|
* -EBUSY if the buffer is busy and no_wait is true.
|
|
* -ERESTARTSYS if interrupted by a signal.
|
|
*/
|
|
extern int
|
|
ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait);
|
|
|
|
/**
|
|
* ttm_bo_synccpu_write_release:
|
|
*
|
|
* @bo : The buffer object.
|
|
*
|
|
* Releases a synccpu lock.
|
|
*/
|
|
extern void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo);
|
|
|
|
/**
|
|
* ttm_bo_acc_size
|
|
*
|
|
* @bdev: Pointer to a ttm_bo_device struct.
|
|
* @bo_size: size of the buffer object in byte.
|
|
* @struct_size: size of the structure holding buffer object datas
|
|
*
|
|
* Returns size to account for a buffer object
|
|
*/
|
|
size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
|
|
unsigned long bo_size,
|
|
unsigned struct_size);
|
|
size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
|
|
unsigned long bo_size,
|
|
unsigned struct_size);
|
|
|
|
/**
|
|
* ttm_bo_init
|
|
*
|
|
* @bdev: Pointer to a ttm_bo_device struct.
|
|
* @bo: Pointer to a ttm_buffer_object to be initialized.
|
|
* @size: Requested size of buffer object.
|
|
* @type: Requested type of buffer object.
|
|
* @flags: Initial placement flags.
|
|
* @page_alignment: Data alignment in pages.
|
|
* @interruptible: If needing to sleep to wait for GPU resources,
|
|
* sleep interruptible.
|
|
* @persistent_swap_storage: Usually the swap storage is deleted for buffers
|
|
* pinned in physical memory. If this behaviour is not desired, this member
|
|
* holds a pointer to a persistent shmem object. Typically, this would
|
|
* point to the shmem object backing a GEM object if TTM is used to back a
|
|
* GEM user interface.
|
|
* @acc_size: Accounted size for this object.
|
|
* @destroy: Destroy function. Use NULL for kfree().
|
|
*
|
|
* This function initializes a pre-allocated struct ttm_buffer_object.
|
|
* As this object may be part of a larger structure, this function,
|
|
* together with the @destroy function,
|
|
* enables driver-specific objects derived from a ttm_buffer_object.
|
|
* On successful return, the object kref and list_kref are set to 1.
|
|
* If a failure occurs, the function will call the @destroy function, or
|
|
* kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is
|
|
* illegal and will likely cause memory corruption.
|
|
*
|
|
* Returns
|
|
* -ENOMEM: Out of memory.
|
|
* -EINVAL: Invalid placement flags.
|
|
* -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
|
|
*/
|
|
|
|
extern int ttm_bo_init(struct ttm_bo_device *bdev,
|
|
struct ttm_buffer_object *bo,
|
|
unsigned long size,
|
|
enum ttm_bo_type type,
|
|
struct ttm_placement *placement,
|
|
uint32_t page_alignment,
|
|
bool interrubtible,
|
|
struct file *persistent_swap_storage,
|
|
size_t acc_size,
|
|
struct sg_table *sg,
|
|
void (*destroy) (struct ttm_buffer_object *));
|
|
|
|
/**
|
|
* ttm_bo_synccpu_object_init
|
|
*
|
|
* @bdev: Pointer to a ttm_bo_device struct.
|
|
* @bo: Pointer to a ttm_buffer_object to be initialized.
|
|
* @size: Requested size of buffer object.
|
|
* @type: Requested type of buffer object.
|
|
* @flags: Initial placement flags.
|
|
* @page_alignment: Data alignment in pages.
|
|
* @interruptible: If needing to sleep while waiting for GPU resources,
|
|
* sleep interruptible.
|
|
* @persistent_swap_storage: Usually the swap storage is deleted for buffers
|
|
* pinned in physical memory. If this behaviour is not desired, this member
|
|
* holds a pointer to a persistent shmem object. Typically, this would
|
|
* point to the shmem object backing a GEM object if TTM is used to back a
|
|
* GEM user interface.
|
|
* @p_bo: On successful completion *p_bo points to the created object.
|
|
*
|
|
* This function allocates a ttm_buffer_object, and then calls ttm_bo_init
|
|
* on that object. The destroy function is set to kfree().
|
|
* Returns
|
|
* -ENOMEM: Out of memory.
|
|
* -EINVAL: Invalid placement flags.
|
|
* -ERESTARTSYS: Interrupted by signal while waiting for resources.
|
|
*/
|
|
|
|
extern int ttm_bo_create(struct ttm_bo_device *bdev,
|
|
unsigned long size,
|
|
enum ttm_bo_type type,
|
|
struct ttm_placement *placement,
|
|
uint32_t page_alignment,
|
|
bool interruptible,
|
|
struct file *persistent_swap_storage,
|
|
struct ttm_buffer_object **p_bo);
|
|
|
|
/**
|
|
* ttm_bo_check_placement
|
|
*
|
|
* @bo: the buffer object.
|
|
* @placement: placements
|
|
*
|
|
* Performs minimal validity checking on an intended change of
|
|
* placement flags.
|
|
* Returns
|
|
* -EINVAL: Intended change is invalid or not allowed.
|
|
*/
|
|
extern int ttm_bo_check_placement(struct ttm_buffer_object *bo,
|
|
struct ttm_placement *placement);
|
|
|
|
/**
|
|
* ttm_bo_init_mm
|
|
*
|
|
* @bdev: Pointer to a ttm_bo_device struct.
|
|
* @mem_type: The memory type.
|
|
* @p_size: size managed area in pages.
|
|
*
|
|
* Initialize a manager for a given memory type.
|
|
* Note: if part of driver firstopen, it must be protected from a
|
|
* potentially racing lastclose.
|
|
* Returns:
|
|
* -EINVAL: invalid size or memory type.
|
|
* -ENOMEM: Not enough memory.
|
|
* May also return driver-specified errors.
|
|
*/
|
|
|
|
extern int ttm_bo_init_mm(struct ttm_bo_device *bdev, unsigned type,
|
|
unsigned long p_size);
|
|
/**
|
|
* ttm_bo_clean_mm
|
|
*
|
|
* @bdev: Pointer to a ttm_bo_device struct.
|
|
* @mem_type: The memory type.
|
|
*
|
|
* Take down a manager for a given memory type after first walking
|
|
* the LRU list to evict any buffers left alive.
|
|
*
|
|
* Normally, this function is part of lastclose() or unload(), and at that
|
|
* point there shouldn't be any buffers left created by user-space, since
|
|
* there should've been removed by the file descriptor release() method.
|
|
* However, before this function is run, make sure to signal all sync objects,
|
|
* and verify that the delayed delete queue is empty. The driver must also
|
|
* make sure that there are no NO_EVICT buffers present in this memory type
|
|
* when the call is made.
|
|
*
|
|
* If this function is part of a VT switch, the caller must make sure that
|
|
* there are no appications currently validating buffers before this
|
|
* function is called. The caller can do that by first taking the
|
|
* struct ttm_bo_device::ttm_lock in write mode.
|
|
*
|
|
* Returns:
|
|
* -EINVAL: invalid or uninitialized memory type.
|
|
* -EBUSY: There are still buffers left in this memory type.
|
|
*/
|
|
|
|
extern int ttm_bo_clean_mm(struct ttm_bo_device *bdev, unsigned mem_type);
|
|
|
|
/**
|
|
* ttm_bo_evict_mm
|
|
*
|
|
* @bdev: Pointer to a ttm_bo_device struct.
|
|
* @mem_type: The memory type.
|
|
*
|
|
* Evicts all buffers on the lru list of the memory type.
|
|
* This is normally part of a VT switch or an
|
|
* out-of-memory-space-due-to-fragmentation handler.
|
|
* The caller must make sure that there are no other processes
|
|
* currently validating buffers, and can do that by taking the
|
|
* struct ttm_bo_device::ttm_lock in write mode.
|
|
*
|
|
* Returns:
|
|
* -EINVAL: Invalid or uninitialized memory type.
|
|
* -ERESTARTSYS: The call was interrupted by a signal while waiting to
|
|
* evict a buffer.
|
|
*/
|
|
|
|
extern int ttm_bo_evict_mm(struct ttm_bo_device *bdev, unsigned mem_type);
|
|
|
|
/**
|
|
* ttm_kmap_obj_virtual
|
|
*
|
|
* @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap.
|
|
* @is_iomem: Pointer to an integer that on return indicates 1 if the
|
|
* virtual map is io memory, 0 if normal memory.
|
|
*
|
|
* Returns the virtual address of a buffer object area mapped by ttm_bo_kmap.
|
|
* If *is_iomem is 1 on return, the virtual address points to an io memory area,
|
|
* that should strictly be accessed by the iowriteXX() and similar functions.
|
|
*/
|
|
|
|
static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
|
|
bool *is_iomem)
|
|
{
|
|
*is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK);
|
|
return map->virtual;
|
|
}
|
|
|
|
/**
|
|
* ttm_bo_kmap
|
|
*
|
|
* @bo: The buffer object.
|
|
* @start_page: The first page to map.
|
|
* @num_pages: Number of pages to map.
|
|
* @map: pointer to a struct ttm_bo_kmap_obj representing the map.
|
|
*
|
|
* Sets up a kernel virtual mapping, using ioremap, vmap or kmap to the
|
|
* data in the buffer object. The ttm_kmap_obj_virtual function can then be
|
|
* used to obtain a virtual address to the data.
|
|
*
|
|
* Returns
|
|
* -ENOMEM: Out of memory.
|
|
* -EINVAL: Invalid range.
|
|
*/
|
|
|
|
extern int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
|
|
unsigned long num_pages, struct ttm_bo_kmap_obj *map);
|
|
|
|
/**
|
|
* ttm_bo_kunmap
|
|
*
|
|
* @map: Object describing the map to unmap.
|
|
*
|
|
* Unmaps a kernel map set up by ttm_bo_kmap.
|
|
*/
|
|
|
|
extern void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
|
|
|
|
/**
|
|
* ttm_fbdev_mmap - mmap fbdev memory backed by a ttm buffer object.
|
|
*
|
|
* @vma: vma as input from the fbdev mmap method.
|
|
* @bo: The bo backing the address space. The address space will
|
|
* have the same size as the bo, and start at offset 0.
|
|
*
|
|
* This function is intended to be called by the fbdev mmap method
|
|
* if the fbdev address space is to be backed by a bo.
|
|
*/
|
|
|
|
extern int ttm_fbdev_mmap(struct vm_area_struct *vma,
|
|
struct ttm_buffer_object *bo);
|
|
|
|
/**
|
|
* ttm_bo_mmap - mmap out of the ttm device address space.
|
|
*
|
|
* @filp: filp as input from the mmap method.
|
|
* @vma: vma as input from the mmap method.
|
|
* @bdev: Pointer to the ttm_bo_device with the address space manager.
|
|
*
|
|
* This function is intended to be called by the device mmap method.
|
|
* if the device address space is to be backed by the bo manager.
|
|
*/
|
|
|
|
extern int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
|
|
struct ttm_bo_device *bdev);
|
|
|
|
/**
|
|
* ttm_bo_io
|
|
*
|
|
* @bdev: Pointer to the struct ttm_bo_device.
|
|
* @filp: Pointer to the struct file attempting to read / write.
|
|
* @wbuf: User-space pointer to address of buffer to write. NULL on read.
|
|
* @rbuf: User-space pointer to address of buffer to read into.
|
|
* Null on write.
|
|
* @count: Number of bytes to read / write.
|
|
* @f_pos: Pointer to current file position.
|
|
* @write: 1 for read, 0 for write.
|
|
*
|
|
* This function implements read / write into ttm buffer objects, and is
|
|
* intended to
|
|
* be called from the fops::read and fops::write method.
|
|
* Returns:
|
|
* See man (2) write, man(2) read. In particular,
|
|
* the function may return -ERESTARTSYS if
|
|
* interrupted by a signal.
|
|
*/
|
|
|
|
extern ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp,
|
|
const char __user *wbuf, char __user *rbuf,
|
|
size_t count, loff_t *f_pos, bool write);
|
|
|
|
extern void ttm_bo_swapout_all(struct ttm_bo_device *bdev);
|
|
extern int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo);
|
|
#endif
|