428 lines
14 KiB
C
428 lines
14 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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*/
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#ifndef _TTM_BO_API_H_
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#define _TTM_BO_API_H_
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#include <drm/drm_gem.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include "ttm_device.h"
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/* Default number of pre-faulted pages in the TTM fault handler */
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#define TTM_BO_VM_NUM_PREFAULT 16
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struct iosys_map;
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struct ttm_global;
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struct ttm_device;
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struct ttm_placement;
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struct ttm_place;
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struct ttm_resource;
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struct ttm_resource_manager;
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struct ttm_tt;
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/**
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* enum ttm_bo_type
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*
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* @ttm_bo_type_device: These are 'normal' buffers that can
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* be mmapped by user space. Each of these bos occupy a slot in the
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* device address space, that can be used for normal vm operations.
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*
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* @ttm_bo_type_kernel: These buffers are like ttm_bo_type_device buffers,
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* but they cannot be accessed from user-space. For kernel-only use.
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*
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* @ttm_bo_type_sg: Buffer made from dmabuf sg table shared with another
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* driver.
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*/
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enum ttm_bo_type {
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ttm_bo_type_device,
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ttm_bo_type_kernel,
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ttm_bo_type_sg
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};
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/**
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* struct ttm_buffer_object
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*
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* @base: drm_gem_object superclass data.
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* @bdev: Pointer to the buffer object device structure.
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* @type: The bo type.
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* @page_alignment: Page alignment.
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* @destroy: Destruction function. If NULL, kfree is used.
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* @kref: Reference count of this buffer object. When this refcount reaches
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* zero, the object is destroyed or put on the delayed delete list.
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* @resource: structure describing current placement.
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* @ttm: TTM structure holding system pages.
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* @deleted: True if the object is only a zombie and already deleted.
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*
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* Base class for TTM buffer object, that deals with data placement and CPU
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* mappings. GPU mappings are really up to the driver, but for simpler GPUs
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* the driver can usually use the placement offset @offset directly as the
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* GPU virtual address. For drivers implementing multiple
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* GPU memory manager contexts, the driver should manage the address space
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* in these contexts separately and use these objects to get the correct
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* placement and caching for these GPU maps. This makes it possible to use
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* these objects for even quite elaborate memory management schemes.
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* The destroy member, the API visibility of this object makes it possible
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* to derive driver specific types.
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*/
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struct ttm_buffer_object {
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struct drm_gem_object base;
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/*
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* Members constant at init.
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*/
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struct ttm_device *bdev;
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enum ttm_bo_type type;
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uint32_t page_alignment;
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void (*destroy) (struct ttm_buffer_object *);
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/*
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* Members not needing protection.
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*/
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struct kref kref;
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/*
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* Members protected by the bo::resv::reserved lock.
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*/
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struct ttm_resource *resource;
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struct ttm_tt *ttm;
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bool deleted;
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struct ttm_lru_bulk_move *bulk_move;
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unsigned priority;
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unsigned pin_count;
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/**
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* @delayed_delete: Work item used when we can't delete the BO
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* immediately
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*/
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struct work_struct delayed_delete;
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/**
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* Special members that are protected by the reserve lock
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* and the bo::lock when written to. Can be read with
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* either of these locks held.
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*/
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struct sg_table *sg;
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};
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/**
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* struct ttm_bo_kmap_obj
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*
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* @virtual: The current kernel virtual address.
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* @page: The page when kmap'ing a single page.
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* @bo_kmap_type: Type of bo_kmap.
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*
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* Object describing a kernel mapping. Since a TTM bo may be located
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* in various memory types with various caching policies, the
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* mapping can either be an ioremap, a vmap, a kmap or part of a
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* premapped region.
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*/
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#define TTM_BO_MAP_IOMEM_MASK 0x80
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struct ttm_bo_kmap_obj {
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void *virtual;
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struct page *page;
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enum {
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ttm_bo_map_iomap = 1 | TTM_BO_MAP_IOMEM_MASK,
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ttm_bo_map_vmap = 2,
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ttm_bo_map_kmap = 3,
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ttm_bo_map_premapped = 4 | TTM_BO_MAP_IOMEM_MASK,
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} bo_kmap_type;
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struct ttm_buffer_object *bo;
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};
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/**
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* struct ttm_operation_ctx
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*
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* @interruptible: Sleep interruptible if sleeping.
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* @no_wait_gpu: Return immediately if the GPU is busy.
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* @gfp_retry_mayfail: Set the __GFP_RETRY_MAYFAIL when allocation pages.
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* @allow_res_evict: Allow eviction of reserved BOs. Can be used when multiple
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* BOs share the same reservation object.
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* @force_alloc: Don't check the memory account during suspend or CPU page
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* faults. Should only be used by TTM internally.
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* @resv: Reservation object to allow reserved evictions with.
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*
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* Context for TTM operations like changing buffer placement or general memory
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* allocation.
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*/
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struct ttm_operation_ctx {
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bool interruptible;
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bool no_wait_gpu;
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bool gfp_retry_mayfail;
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bool allow_res_evict;
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bool force_alloc;
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struct dma_resv *resv;
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uint64_t bytes_moved;
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};
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/**
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* ttm_bo_get - reference a struct ttm_buffer_object
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*
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* @bo: The buffer object.
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*/
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static inline void ttm_bo_get(struct ttm_buffer_object *bo)
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{
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kref_get(&bo->kref);
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}
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/**
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* ttm_bo_get_unless_zero - reference a struct ttm_buffer_object unless
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* its refcount has already reached zero.
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* @bo: The buffer object.
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*
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* Used to reference a TTM buffer object in lookups where the object is removed
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* from the lookup structure during the destructor and for RCU lookups.
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*
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* Returns: @bo if the referencing was successful, NULL otherwise.
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*/
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static inline __must_check struct ttm_buffer_object *
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ttm_bo_get_unless_zero(struct ttm_buffer_object *bo)
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{
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if (!kref_get_unless_zero(&bo->kref))
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return NULL;
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return bo;
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}
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/**
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* ttm_bo_reserve:
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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* @interruptible: Sleep interruptible if waiting.
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* @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
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* @ticket: ticket used to acquire the ww_mutex.
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*
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* Locks a buffer object for validation. (Or prevents other processes from
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* locking it for validation), while taking a number of measures to prevent
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* deadlocks.
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*
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* Returns:
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* -EDEADLK: The reservation may cause a deadlock.
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* Release all buffer reservations, wait for @bo to become unreserved and
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* try again.
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* -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
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* a signal. Release all buffer reservations and return to user-space.
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* -EBUSY: The function needed to sleep, but @no_wait was true
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* -EALREADY: Bo already reserved using @ticket. This error code will only
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* be returned if @use_ticket is set to true.
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*/
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static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
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bool interruptible, bool no_wait,
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struct ww_acquire_ctx *ticket)
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{
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int ret = 0;
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if (no_wait) {
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bool success;
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if (WARN_ON(ticket))
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return -EBUSY;
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success = dma_resv_trylock(bo->base.resv);
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return success ? 0 : -EBUSY;
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}
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if (interruptible)
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ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
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else
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ret = dma_resv_lock(bo->base.resv, ticket);
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if (ret == -EINTR)
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return -ERESTARTSYS;
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return ret;
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}
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/**
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* ttm_bo_reserve_slowpath:
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* @bo: A pointer to a struct ttm_buffer_object.
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* @interruptible: Sleep interruptible if waiting.
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* @sequence: Set (@bo)->sequence to this value after lock
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*
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* This is called after ttm_bo_reserve returns -EAGAIN and we backed off
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* from all our other reservations. Because there are no other reservations
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* held by us, this function cannot deadlock any more.
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*/
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static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
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bool interruptible,
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struct ww_acquire_ctx *ticket)
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{
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if (interruptible) {
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int ret = dma_resv_lock_slow_interruptible(bo->base.resv,
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ticket);
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if (ret == -EINTR)
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ret = -ERESTARTSYS;
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return ret;
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}
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dma_resv_lock_slow(bo->base.resv, ticket);
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return 0;
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}
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void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo);
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static inline void
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ttm_bo_move_to_lru_tail_unlocked(struct ttm_buffer_object *bo)
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{
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spin_lock(&bo->bdev->lru_lock);
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ttm_bo_move_to_lru_tail(bo);
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spin_unlock(&bo->bdev->lru_lock);
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}
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static inline void ttm_bo_assign_mem(struct ttm_buffer_object *bo,
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struct ttm_resource *new_mem)
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{
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WARN_ON(bo->resource);
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bo->resource = new_mem;
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}
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/**
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* ttm_bo_move_null = assign memory for a buffer object.
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* @bo: The bo to assign the memory to
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* @new_mem: The memory to be assigned.
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*
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* Assign the memory from new_mem to the memory of the buffer object bo.
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*/
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static inline void ttm_bo_move_null(struct ttm_buffer_object *bo,
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struct ttm_resource *new_mem)
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{
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ttm_resource_free(bo, &bo->resource);
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ttm_bo_assign_mem(bo, new_mem);
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}
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/**
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* ttm_bo_unreserve
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*
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* @bo: A pointer to a struct ttm_buffer_object.
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*
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* Unreserve a previous reservation of @bo.
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*/
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static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
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{
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ttm_bo_move_to_lru_tail_unlocked(bo);
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dma_resv_unlock(bo->base.resv);
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}
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/**
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* ttm_kmap_obj_virtual
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*
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* @map: A struct ttm_bo_kmap_obj returned from ttm_bo_kmap.
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* @is_iomem: Pointer to an integer that on return indicates 1 if the
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* virtual map is io memory, 0 if normal memory.
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*
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* Returns the virtual address of a buffer object area mapped by ttm_bo_kmap.
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* If *is_iomem is 1 on return, the virtual address points to an io memory area,
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* that should strictly be accessed by the iowriteXX() and similar functions.
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*/
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static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
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bool *is_iomem)
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{
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*is_iomem = !!(map->bo_kmap_type & TTM_BO_MAP_IOMEM_MASK);
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return map->virtual;
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}
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int ttm_bo_wait_ctx(struct ttm_buffer_object *bo,
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struct ttm_operation_ctx *ctx);
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int ttm_bo_validate(struct ttm_buffer_object *bo,
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struct ttm_placement *placement,
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struct ttm_operation_ctx *ctx);
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void ttm_bo_put(struct ttm_buffer_object *bo);
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void ttm_bo_set_bulk_move(struct ttm_buffer_object *bo,
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struct ttm_lru_bulk_move *bulk);
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bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
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const struct ttm_place *place);
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int ttm_bo_init_reserved(struct ttm_device *bdev, struct ttm_buffer_object *bo,
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enum ttm_bo_type type, struct ttm_placement *placement,
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uint32_t alignment, struct ttm_operation_ctx *ctx,
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struct sg_table *sg, struct dma_resv *resv,
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void (*destroy)(struct ttm_buffer_object *));
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int ttm_bo_init_validate(struct ttm_device *bdev, struct ttm_buffer_object *bo,
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enum ttm_bo_type type, struct ttm_placement *placement,
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uint32_t alignment, bool interruptible,
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struct sg_table *sg, struct dma_resv *resv,
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void (*destroy)(struct ttm_buffer_object *));
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int ttm_bo_kmap(struct ttm_buffer_object *bo, unsigned long start_page,
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unsigned long num_pages, struct ttm_bo_kmap_obj *map);
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void ttm_bo_kunmap(struct ttm_bo_kmap_obj *map);
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int ttm_bo_vmap(struct ttm_buffer_object *bo, struct iosys_map *map);
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void ttm_bo_vunmap(struct ttm_buffer_object *bo, struct iosys_map *map);
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int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo);
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int ttm_bo_swapout(struct ttm_buffer_object *bo, struct ttm_operation_ctx *ctx,
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gfp_t gfp_flags);
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void ttm_bo_pin(struct ttm_buffer_object *bo);
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void ttm_bo_unpin(struct ttm_buffer_object *bo);
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int ttm_mem_evict_first(struct ttm_device *bdev,
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struct ttm_resource_manager *man,
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const struct ttm_place *place,
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struct ttm_operation_ctx *ctx,
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struct ww_acquire_ctx *ticket);
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vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
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struct vm_fault *vmf);
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vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
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pgprot_t prot,
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pgoff_t num_prefault);
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vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf);
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void ttm_bo_vm_open(struct vm_area_struct *vma);
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void ttm_bo_vm_close(struct vm_area_struct *vma);
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int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
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void *buf, int len, int write);
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vm_fault_t ttm_bo_vm_dummy_page(struct vm_fault *vmf, pgprot_t prot);
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int ttm_bo_mem_space(struct ttm_buffer_object *bo,
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struct ttm_placement *placement,
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struct ttm_resource **mem,
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struct ttm_operation_ctx *ctx);
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void ttm_bo_unmap_virtual(struct ttm_buffer_object *bo);
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/*
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* ttm_bo_util.c
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*/
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int ttm_mem_io_reserve(struct ttm_device *bdev,
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struct ttm_resource *mem);
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void ttm_mem_io_free(struct ttm_device *bdev,
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struct ttm_resource *mem);
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void ttm_move_memcpy(bool clear, u32 num_pages,
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struct ttm_kmap_iter *dst_iter,
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struct ttm_kmap_iter *src_iter);
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int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
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struct ttm_operation_ctx *ctx,
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struct ttm_resource *new_mem);
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int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
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struct dma_fence *fence, bool evict,
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bool pipeline,
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struct ttm_resource *new_mem);
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void ttm_bo_move_sync_cleanup(struct ttm_buffer_object *bo,
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struct ttm_resource *new_mem);
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int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo);
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pgprot_t ttm_io_prot(struct ttm_buffer_object *bo, struct ttm_resource *res,
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pgprot_t tmp);
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void ttm_bo_tt_destroy(struct ttm_buffer_object *bo);
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#endif
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