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OpenCloudOS-Kernel/include/drm/ttm/ttm_bo_driver.h

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/**************************************************************************
*
* 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_DRIVER_H_
#define _TTM_BO_DRIVER_H_
#include <drm/drm_mm.h>
#include <drm/drm_vma_manager.h>
#include <linux/workqueue.h>
#include <linux/fs.h>
#include <linux/spinlock.h>
#include <linux/dma-resv.h>
#include "ttm_bo_api.h"
#include "ttm_memory.h"
#include "ttm_module.h"
#include "ttm_placement.h"
#include "ttm_tt.h"
/**
* struct ttm_bo_driver
*
* @create_ttm_backend_entry: Callback to create a struct ttm_backend.
* @evict_flags: Callback to obtain placement flags when a buffer is evicted.
* @move: Callback for a driver to hook in accelerated functions to
* move a buffer.
* If set to NULL, a potentially slow memcpy() move is used.
*/
struct ttm_bo_driver {
/**
* ttm_tt_create
*
* @bo: The buffer object to create the ttm for.
* @page_flags: Page flags as identified by TTM_PAGE_FLAG_XX flags.
*
* Create a struct ttm_tt to back data with system memory pages.
* No pages are actually allocated.
* Returns:
* NULL: Out of memory.
*/
struct ttm_tt *(*ttm_tt_create)(struct ttm_buffer_object *bo,
uint32_t page_flags);
/**
* ttm_tt_populate
*
* @ttm: The struct ttm_tt to contain the backing pages.
*
* Allocate all backing pages
* Returns:
* -ENOMEM: Out of memory.
*/
int (*ttm_tt_populate)(struct ttm_bo_device *bdev,
struct ttm_tt *ttm,
struct ttm_operation_ctx *ctx);
/**
* ttm_tt_unpopulate
*
* @ttm: The struct ttm_tt to contain the backing pages.
*
* Free all backing page
*/
void (*ttm_tt_unpopulate)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
/**
* ttm_tt_bind
*
* @bdev: Pointer to a ttm device
* @ttm: Pointer to a struct ttm_tt.
* @bo_mem: Pointer to a struct ttm_resource describing the
* memory type and location for binding.
*
* Bind the backend pages into the aperture in the location
* indicated by @bo_mem. This function should be able to handle
* differences between aperture and system page sizes.
*/
int (*ttm_tt_bind)(struct ttm_bo_device *bdev, struct ttm_tt *ttm, struct ttm_resource *bo_mem);
/**
* ttm_tt_unbind
*
* @bdev: Pointer to a ttm device
* @ttm: Pointer to a struct ttm_tt.
*
* Unbind previously bound backend pages. This function should be
* able to handle differences between aperture and system page sizes.
*/
void (*ttm_tt_unbind)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
/**
* ttm_tt_destroy
*
* @bdev: Pointer to a ttm device
* @ttm: Pointer to a struct ttm_tt.
*
* Destroy the backend. This will be call back from ttm_tt_destroy so
* don't call ttm_tt_destroy from the callback or infinite loop.
*/
void (*ttm_tt_destroy)(struct ttm_bo_device *bdev, struct ttm_tt *ttm);
/**
* struct ttm_bo_driver member eviction_valuable
*
* @bo: the buffer object to be evicted
* @place: placement we need room for
*
* Check with the driver if it is valuable to evict a BO to make room
* for a certain placement.
*/
bool (*eviction_valuable)(struct ttm_buffer_object *bo,
const struct ttm_place *place);
/**
* struct ttm_bo_driver member evict_flags:
*
* @bo: the buffer object to be evicted
*
* Return the bo flags for a buffer which is not mapped to the hardware.
* These will be placed in proposed_flags so that when the move is
* finished, they'll end up in bo->mem.flags
*/
void (*evict_flags)(struct ttm_buffer_object *bo,
struct ttm_placement *placement);
/**
* struct ttm_bo_driver member move:
*
* @bo: the buffer to move
* @evict: whether this motion is evicting the buffer from
* the graphics address space
* @ctx: context for this move with parameters
* @new_mem: the new memory region receiving the buffer
*
* Move a buffer between two memory regions.
*/
int (*move)(struct ttm_buffer_object *bo, bool evict,
struct ttm_operation_ctx *ctx,
struct ttm_resource *new_mem);
/**
* struct ttm_bo_driver_member verify_access
*
* @bo: Pointer to a buffer object.
* @filp: Pointer to a struct file trying to access the object.
*
* Called from the map / write / read methods to verify that the
* caller is permitted to access the buffer object.
* This member may be set to NULL, which will refuse this kind of
* access for all buffer objects.
* This function should return 0 if access is granted, -EPERM otherwise.
*/
int (*verify_access)(struct ttm_buffer_object *bo,
struct file *filp);
/**
* Hook to notify driver about a driver move so it
* can do tiling things and book-keeping.
*
* @evict: whether this move is evicting the buffer from the graphics
* address space
*/
void (*move_notify)(struct ttm_buffer_object *bo,
bool evict,
struct ttm_resource *new_mem);
/* notify the driver we are taking a fault on this BO
* and have reserved it */
int (*fault_reserve_notify)(struct ttm_buffer_object *bo);
/**
* notify the driver that we're about to swap out this bo
*/
void (*swap_notify)(struct ttm_buffer_object *bo);
/**
* Driver callback on when mapping io memory (for bo_move_memcpy
* for instance). TTM will take care to call io_mem_free whenever
* the mapping is not use anymore. io_mem_reserve & io_mem_free
* are balanced.
*/
int (*io_mem_reserve)(struct ttm_bo_device *bdev,
struct ttm_resource *mem);
void (*io_mem_free)(struct ttm_bo_device *bdev,
struct ttm_resource *mem);
/**
* Return the pfn for a given page_offset inside the BO.
*
* @bo: the BO to look up the pfn for
* @page_offset: the offset to look up
*/
unsigned long (*io_mem_pfn)(struct ttm_buffer_object *bo,
unsigned long page_offset);
/**
* Read/write memory buffers for ptrace access
*
* @bo: the BO to access
* @offset: the offset from the start of the BO
* @buf: pointer to source/destination buffer
* @len: number of bytes to copy
* @write: whether to read (0) from or write (non-0) to BO
*
* If successful, this function should return the number of
* bytes copied, -EIO otherwise. If the number of bytes
* returned is < len, the function may be called again with
* the remainder of the buffer to copy.
*/
int (*access_memory)(struct ttm_buffer_object *bo, unsigned long offset,
void *buf, int len, int write);
/**
* struct ttm_bo_driver member del_from_lru_notify
*
* @bo: the buffer object deleted from lru
*
* notify driver that a BO was deleted from LRU.
*/
void (*del_from_lru_notify)(struct ttm_buffer_object *bo);
/**
* Notify the driver that we're about to release a BO
*
* @bo: BO that is about to be released
*
* Gives the driver a chance to do any cleanup, including
* adding fences that may force a delayed delete
*/
void (*release_notify)(struct ttm_buffer_object *bo);
};
/**
* struct ttm_bo_global - Buffer object driver global data.
*
* @dummy_read_page: Pointer to a dummy page used for mapping requests
* of unpopulated pages.
* @shrink: A shrink callback object used for buffer object swap.
* @device_list_mutex: Mutex protecting the device list.
* This mutex is held while traversing the device list for pm options.
* @lru_lock: Spinlock protecting the bo subsystem lru lists.
* @device_list: List of buffer object devices.
* @swap_lru: Lru list of buffer objects used for swapping.
*/
extern struct ttm_bo_global {
/**
* Constant after init.
*/
struct kobject kobj;
struct page *dummy_read_page;
spinlock_t lru_lock;
/**
* Protected by ttm_global_mutex.
*/
struct list_head device_list;
/**
* Protected by the lru_lock.
*/
struct list_head swap_lru[TTM_MAX_BO_PRIORITY];
/**
* Internal protection.
*/
atomic_t bo_count;
} ttm_bo_glob;
#define TTM_NUM_MEM_TYPES 8
/**
* struct ttm_bo_device - Buffer object driver device-specific data.
*
* @driver: Pointer to a struct ttm_bo_driver struct setup by the driver.
* @man: An array of resource_managers.
* @vma_manager: Address space manager (pointer)
* lru_lock: Spinlock that protects the buffer+device lru lists and
* ddestroy lists.
* @dev_mapping: A pointer to the struct address_space representing the
* device address space.
* @wq: Work queue structure for the delayed delete workqueue.
* @no_retry: Don't retry allocation if it fails
*
*/
struct ttm_bo_device {
/*
* Constant after bo device init / atomic.
*/
struct list_head device_list;
struct ttm_bo_driver *driver;
/*
* access via ttm_manager_type.
*/
struct ttm_resource_manager sysman;
struct ttm_resource_manager *man_drv[TTM_NUM_MEM_TYPES];
/*
* Protected by internal locks.
*/
struct drm_vma_offset_manager *vma_manager;
/*
* Protected by the global:lru lock.
*/
struct list_head ddestroy;
/*
* Protected by load / firstopen / lastclose /unload sync.
*/
struct address_space *dev_mapping;
/*
* Internal protection.
*/
struct delayed_work wq;
bool need_dma32;
bool no_retry;
};
static inline struct ttm_resource_manager *ttm_manager_type(struct ttm_bo_device *bdev,
int mem_type)
{
return bdev->man_drv[mem_type];
}
static inline void ttm_set_driver_manager(struct ttm_bo_device *bdev,
int type,
struct ttm_resource_manager *manager)
{
bdev->man_drv[type] = manager;
}
/**
* struct ttm_lru_bulk_move_pos
*
* @first: first BO in the bulk move range
* @last: last BO in the bulk move range
*
* Positions for a lru bulk move.
*/
struct ttm_lru_bulk_move_pos {
struct ttm_buffer_object *first;
struct ttm_buffer_object *last;
};
/**
* struct ttm_lru_bulk_move
*
* @tt: first/last lru entry for BOs in the TT domain
* @vram: first/last lru entry for BOs in the VRAM domain
* @swap: first/last lru entry for BOs on the swap list
*
* Helper structure for bulk moves on the LRU list.
*/
struct ttm_lru_bulk_move {
struct ttm_lru_bulk_move_pos tt[TTM_MAX_BO_PRIORITY];
struct ttm_lru_bulk_move_pos vram[TTM_MAX_BO_PRIORITY];
struct ttm_lru_bulk_move_pos swap[TTM_MAX_BO_PRIORITY];
};
/*
* ttm_bo.c
*/
/**
* ttm_bo_mem_space
*
* @bo: Pointer to a struct ttm_buffer_object. the data of which
* we want to allocate space for.
* @proposed_placement: Proposed new placement for the buffer object.
* @mem: A struct ttm_resource.
* @interruptible: Sleep interruptible when sliping.
* @no_wait_gpu: Return immediately if the GPU is busy.
*
* Allocate memory space for the buffer object pointed to by @bo, using
* the placement flags in @mem, potentially evicting other idle buffer objects.
* This function may sleep while waiting for space to become available.
* Returns:
* -EBUSY: No space available (only if no_wait == 1).
* -ENOMEM: Could not allocate memory for the buffer object, either due to
* fragmentation or concurrent allocators.
* -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
*/
int ttm_bo_mem_space(struct ttm_buffer_object *bo,
struct ttm_placement *placement,
struct ttm_resource *mem,
struct ttm_operation_ctx *ctx);
int ttm_bo_device_release(struct ttm_bo_device *bdev);
/**
* ttm_bo_device_init
*
* @bdev: A pointer to a struct ttm_bo_device to initialize.
* @glob: A pointer to an initialized struct ttm_bo_global.
* @driver: A pointer to a struct ttm_bo_driver set up by the caller.
* @mapping: The address space to use for this bo.
* @vma_manager: A pointer to a vma manager.
* @file_page_offset: Offset into the device address space that is available
* for buffer data. This ensures compatibility with other users of the
* address space.
*
* Initializes a struct ttm_bo_device:
* Returns:
* !0: Failure.
*/
int ttm_bo_device_init(struct ttm_bo_device *bdev,
struct ttm_bo_driver *driver,
struct address_space *mapping,
struct drm_vma_offset_manager *vma_manager,
bool need_dma32);
/**
* ttm_bo_unmap_virtual
*
* @bo: tear down the virtual mappings for this BO
*/
void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
/**
* ttm_bo_unmap_virtual
*
* @bo: tear down the virtual mappings for this BO
*
* The caller must take ttm_mem_io_lock before calling this function.
*/
void ttm_bo_unmap_virtual_locked(struct ttm_buffer_object *bo);
/**
* ttm_bo_reserve:
*
* @bo: A pointer to a struct ttm_buffer_object.
* @interruptible: Sleep interruptible if waiting.
* @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
* @ticket: ticket used to acquire the ww_mutex.
*
* Locks a buffer object for validation. (Or prevents other processes from
* locking it for validation), while taking a number of measures to prevent
* deadlocks.
*
* Returns:
* -EDEADLK: The reservation may cause a deadlock.
* Release all buffer reservations, wait for @bo to become unreserved and
* try again.
* -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
* a signal. Release all buffer reservations and return to user-space.
* -EBUSY: The function needed to sleep, but @no_wait was true
* -EALREADY: Bo already reserved using @ticket. This error code will only
* be returned if @use_ticket is set to true.
*/
static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
bool interruptible, bool no_wait,
struct ww_acquire_ctx *ticket)
{
int ret = 0;
if (no_wait) {
bool success;
if (WARN_ON(ticket))
return -EBUSY;
success = dma_resv_trylock(bo->base.resv);
return success ? 0 : -EBUSY;
}
if (interruptible)
ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
else
ret = dma_resv_lock(bo->base.resv, ticket);
if (ret == -EINTR)
return -ERESTARTSYS;
return ret;
}
/**
* ttm_bo_reserve_slowpath:
* @bo: A pointer to a struct ttm_buffer_object.
* @interruptible: Sleep interruptible if waiting.
* @sequence: Set (@bo)->sequence to this value after lock
*
* This is called after ttm_bo_reserve returns -EAGAIN and we backed off
* from all our other reservations. Because there are no other reservations
* held by us, this function cannot deadlock any more.
*/
static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
bool interruptible,
struct ww_acquire_ctx *ticket)
{
if (interruptible) {
int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
ticket);
if (ret == -EINTR)
ret = -ERESTARTSYS;
return ret;
}
dma_resv_lock_slow(bo->base.resv, ticket);
return 0;
}
static inline void ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
{
spin_lock(&ttm_bo_glob.lru_lock);
ttm_bo_move_to_lru_tail(bo, NULL);
spin_unlock(&ttm_bo_glob.lru_lock);
}
static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
struct ttm_resource *new_mem)
{
bo->mem = *new_mem;
new_mem->mm_node = NULL;
}
/**
* ttm_bo_move_null = assign memory for a buffer object.
* @bo: The bo to assign the memory to
* @new_mem: The memory to be assigned.
*
* Assign the memory from new_mem to the memory of the buffer object bo.
*/
static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
struct ttm_resource *new_mem)
{
struct ttm_resource *old_mem = &bo->mem;
WARN_ON(old_mem->mm_node != NULL);
ttm_bo_assign_mem(bo, new_mem);
}
/**
* ttm_bo_unreserve
*
* @bo: A pointer to a struct ttm_buffer_object.
*
* Unreserve a previous reservation of @bo.
*/
static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
{
ttm_bo_move_to_lru_tail_unlocked(bo);
dma_resv_unlock(bo->base.resv);
}
/*
* ttm_bo_util.c
*/
int ttm_mem_io_reserve(struct ttm_bo_device *bdev,
struct ttm_resource *mem);
void ttm_mem_io_free(struct ttm_bo_device *bdev,
struct ttm_resource *mem);
/**
* ttm_bo_move_ttm
*
* @bo: A pointer to a struct ttm_buffer_object.
* @interruptible: Sleep interruptible if waiting.
* @no_wait_gpu: Return immediately if the GPU is busy.
* @new_mem: struct ttm_resource indicating where to move.
*
* Optimized move function for a buffer object with both old and
* new placement backed by a TTM. The function will, if successful,
* free any old aperture space, and set (@new_mem)->mm_node to NULL,
* and update the (@bo)->mem placement flags. If unsuccessful, the old
* data remains untouched, and it's up to the caller to free the
* memory space indicated by @new_mem.
* Returns:
* !0: Failure.
*/
int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
struct ttm_operation_ctx *ctx,
struct ttm_resource *new_mem);
/**
* ttm_bo_move_memcpy
*
* @bo: A pointer to a struct ttm_buffer_object.
* @interruptible: Sleep interruptible if waiting.
* @no_wait_gpu: Return immediately if the GPU is busy.
* @new_mem: struct ttm_resource indicating where to move.
*
* Fallback move function for a mappable buffer object in mappable memory.
* The function will, if successful,
* free any old aperture space, and set (@new_mem)->mm_node to NULL,
* and update the (@bo)->mem placement flags. If unsuccessful, the old
* data remains untouched, and it's up to the caller to free the
* memory space indicated by @new_mem.
* Returns:
* !0: Failure.
*/
int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
struct ttm_operation_ctx *ctx,
struct ttm_resource *new_mem);
/**
* ttm_bo_free_old_node
*
* @bo: A pointer to a struct ttm_buffer_object.
*
* Utility function to free an old placement after a successful move.
*/
void ttm_bo_free_old_node(struct ttm_buffer_object *bo);
/**
* ttm_bo_move_accel_cleanup.
*
* @bo: A pointer to a struct ttm_buffer_object.
* @fence: A fence object that signals when moving is complete.
* @evict: This is an evict move. Don't return until the buffer is idle.
* @pipeline: evictions are to be pipelined.
* @new_mem: struct ttm_resource indicating where to move.
*
* Accelerated move function to be called when an accelerated move
* has been scheduled. The function will create a new temporary buffer object
* representing the old placement, and put the sync object on both buffer
* objects. After that the newly created buffer object is unref'd to be
* destroyed when the move is complete. This will help pipeline
* buffer moves.
*/
int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
struct dma_fence *fence, bool evict,
bool pipeline,
struct ttm_resource *new_mem);
/**
* ttm_bo_pipeline_gutting.
*
* @bo: A pointer to a struct ttm_buffer_object.
*
* Pipelined gutting a BO of its backing store.
*/
int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
/**
* ttm_io_prot
*
* @c_state: Caching state.
* @tmp: Page protection flag for a normal, cached mapping.
*
* Utility function that returns the pgprot_t that should be used for
* setting up a PTE with the caching model indicated by @c_state.
*/
pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp);
/**
* ttm_bo_tt_bind
*
* Bind the object tt to a memory resource.
*/
int ttm_bo_tt_bind(struct ttm_buffer_object *bo, struct ttm_resource *mem);
/**
* ttm_bo_tt_bind
*
* Unbind the object tt from a memory resource.
*/
void ttm_bo_tt_unbind(struct ttm_buffer_object *bo);
/**
* ttm_bo_tt_destroy.
*/
void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
/**
* ttm_range_man_init
*
* @bdev: ttm device
* @type: memory manager type
* @use_tt: if the memory manager uses tt
* @p_size: size of area to be managed in pages.
*
* Initialise a generic range manager for the selected memory type.
* The range manager is installed for this device in the type slot.
*/
int ttm_range_man_init(struct ttm_bo_device *bdev,
unsigned type, bool use_tt,
unsigned long p_size);
/**
* ttm_range_man_fini
*
* @bdev: ttm device
* @type: memory manager type
*
* Remove the generic range manager from a slot and tear it down.
*/
int ttm_range_man_fini(struct ttm_bo_device *bdev,
unsigned type);
#endif
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