430 lines
14 KiB
C
430 lines
14 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_gem.h>
|
|
|
|
#include <linux/kref.h>
|
|
#include <linux/list.h>
|
|
|
|
#include "ttm_device.h"
|
|
|
|
/* Default number of pre-faulted pages in the TTM fault handler */
|
|
#define TTM_BO_VM_NUM_PREFAULT 16
|
|
|
|
struct iosys_map;
|
|
|
|
struct ttm_global;
|
|
struct ttm_device;
|
|
struct ttm_placement;
|
|
struct ttm_place;
|
|
struct ttm_resource;
|
|
struct ttm_resource_manager;
|
|
struct ttm_tt;
|
|
|
|
/**
|
|
* 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_buffer_object
|
|
*
|
|
* @base: drm_gem_object superclass data.
|
|
* @bdev: Pointer to the buffer object device structure.
|
|
* @type: The bo type.
|
|
* @page_alignment: Page alignment.
|
|
* @destroy: Destruction function. If NULL, kfree is used.
|
|
* @kref: Reference count of this buffer object. When this refcount reaches
|
|
* zero, the object is destroyed or put on the delayed delete list.
|
|
* @resource: structure describing current placement.
|
|
* @ttm: TTM structure holding system pages.
|
|
* @deleted: True if the object is only a zombie and already deleted.
|
|
*
|
|
* 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 {
|
|
struct drm_gem_object base;
|
|
|
|
/*
|
|
* Members constant at init.
|
|
*/
|
|
struct ttm_device *bdev;
|
|
enum ttm_bo_type type;
|
|
uint32_t page_alignment;
|
|
void (*destroy) (struct ttm_buffer_object *);
|
|
|
|
/*
|
|
* Members not needing protection.
|
|
*/
|
|
struct kref kref;
|
|
|
|
/*
|
|
* Members protected by the bo::resv::reserved lock.
|
|
*/
|
|
struct ttm_resource *resource;
|
|
struct ttm_tt *ttm;
|
|
bool deleted;
|
|
struct ttm_lru_bulk_move *bulk_move;
|
|
unsigned priority;
|
|
unsigned pin_count;
|
|
|
|
/**
|
|
* @delayed_delete: Work item used when we can't delete the BO
|
|
* immediately
|
|
*/
|
|
struct work_struct delayed_delete;
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
struct sg_table *sg;
|
|
};
|
|
|
|
/**
|
|
* 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;
|
|
};
|
|
|
|
/**
|
|
* struct ttm_operation_ctx
|
|
*
|
|
* @interruptible: Sleep interruptible if sleeping.
|
|
* @no_wait_gpu: Return immediately if the GPU is busy.
|
|
* @gfp_retry_mayfail: Set the __GFP_RETRY_MAYFAIL when allocation pages.
|
|
* @allow_res_evict: Allow eviction of reserved BOs. Can be used when multiple
|
|
* BOs share the same reservation object.
|
|
* @force_alloc: Don't check the memory account during suspend or CPU page
|
|
* faults. Should only be used by TTM internally.
|
|
* @resv: Reservation object to allow reserved evictions with.
|
|
*
|
|
* Context for TTM operations like changing buffer placement or general memory
|
|
* allocation.
|
|
*/
|
|
struct ttm_operation_ctx {
|
|
bool interruptible;
|
|
bool no_wait_gpu;
|
|
bool gfp_retry_mayfail;
|
|
bool allow_res_evict;
|
|
bool force_alloc;
|
|
struct dma_resv *resv;
|
|
uint64_t bytes_moved;
|
|
};
|
|
|
|
/**
|
|
* ttm_bo_get - reference a struct ttm_buffer_object
|
|
*
|
|
* @bo: The buffer object.
|
|
*/
|
|
static inline void ttm_bo_get(struct ttm_buffer_object *bo)
|
|
{
|
|
kref_get(&bo->kref);
|
|
}
|
|
|
|
/**
|
|
* ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless
|
|
* its refcount has already reached zero.
|
|
* @bo: The buffer object.
|
|
*
|
|
* Used to reference a TTM buffer object in lookups where the object is removed
|
|
* from the lookup structure during the destructor and for RCU lookups.
|
|
*
|
|
* Returns: @bo if the referencing was successful, NULL otherwise.
|
|
*/
|
|
static inline __must_check struct ttm_buffer_object *
|
|
ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)
|
|
{
|
|
if (!kref_get_unless_zero(&bo->kref))
|
|
return NULL;
|
|
return 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;
|
|
}
|
|
|
|
void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
|
|
|
|
static inline void
|
|
ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
|
|
{
|
|
spin_lock(&bo->bdev->lru_lock);
|
|
ttm_bo_move_to_lru_tail(bo);
|
|
spin_unlock(&bo->bdev->lru_lock);
|
|
}
|
|
|
|
static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
|
|
struct ttm_resource *new_mem)
|
|
{
|
|
WARN_ON(bo->resource);
|
|
bo->resource = new_mem;
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
ttm_resource_free(bo, &bo->resource);
|
|
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_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;
|
|
}
|
|
|
|
int ttm_bo_wait_ctx(struct ttm_buffer_object *bo,
|
|
struct ttm_operation_ctx *ctx);
|
|
int ttm_bo_validate(struct ttm_buffer_object *bo,
|
|
struct ttm_placement *placement,
|
|
struct ttm_operation_ctx *ctx);
|
|
void ttm_bo_put(struct ttm_buffer_object *bo);
|
|
void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
|
|
struct ttm_lru_bulk_move *bulk);
|
|
int ttm_bo_lock_delayed_workqueue(struct ttm_device *bdev);
|
|
void ttm_bo_unlock_delayed_workqueue(struct ttm_device *bdev, int resched);
|
|
bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
|
|
const struct ttm_place *place);
|
|
int ttm_bo_init_reserved(struct ttm_device *bdev, struct ttm_buffer_object *bo,
|
|
enum ttm_bo_type type, struct ttm_placement *placement,
|
|
uint32_t alignment, struct ttm_operation_ctx *ctx,
|
|
struct sg_table *sg, struct dma_resv *resv,
|
|
void (*destroy)(struct ttm_buffer_object *));
|
|
int ttm_bo_init_validate(struct ttm_device *bdev, struct ttm_buffer_object *bo,
|
|
enum ttm_bo_type type, struct ttm_placement *placement,
|
|
uint32_t alignment, bool interruptible,
|
|
struct sg_table *sg, struct dma_resv *resv,
|
|
void (*destroy)(struct ttm_buffer_object *));
|
|
int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
|
|
unsigned long num_pages, struct ttm_bo_kmap_obj *map);
|
|
void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
|
|
int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map);
|
|
void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map);
|
|
int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
|
|
int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
|
|
gfp_t gfp_flags);
|
|
void ttm_bo_pin(struct ttm_buffer_object *bo);
|
|
void ttm_bo_unpin(struct ttm_buffer_object *bo);
|
|
int ttm_mem_evict_first(struct ttm_device *bdev,
|
|
struct ttm_resource_manager *man,
|
|
const struct ttm_place *place,
|
|
struct ttm_operation_ctx *ctx,
|
|
struct ww_acquire_ctx *ticket);
|
|
vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
|
|
struct vm_fault *vmf);
|
|
vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
|
|
pgprot_t prot,
|
|
pgoff_t num_prefault);
|
|
vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf);
|
|
void ttm_bo_vm_open(struct vm_area_struct *vma);
|
|
void ttm_bo_vm_close(struct vm_area_struct *vma);
|
|
int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
|
|
void *buf, int len, int write);
|
|
vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot);
|
|
|
|
int ttm_bo_mem_space(struct ttm_buffer_object *bo,
|
|
struct ttm_placement *placement,
|
|
struct ttm_resource **mem,
|
|
struct ttm_operation_ctx *ctx);
|
|
|
|
void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
|
|
/*
|
|
* ttm_bo_util.c
|
|
*/
|
|
int ttm_mem_io_reserve(struct ttm_device *bdev,
|
|
struct ttm_resource *mem);
|
|
void ttm_mem_io_free(struct ttm_device *bdev,
|
|
struct ttm_resource *mem);
|
|
void ttm_move_memcpy(bool clear, u32 num_pages,
|
|
struct ttm_kmap_iter *dst_iter,
|
|
struct ttm_kmap_iter *src_iter);
|
|
int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
|
|
struct ttm_operation_ctx *ctx,
|
|
struct ttm_resource *new_mem);
|
|
int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
|
|
struct dma_fence *fence, bool evict,
|
|
bool pipeline,
|
|
struct ttm_resource *new_mem);
|
|
void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
|
|
struct ttm_resource *new_mem);
|
|
int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
|
|
pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
|
|
pgprot_t tmp);
|
|
void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
|
|
|
|
#endif
|