![Alexandre Courbot](/assets/img/avatar_default.png)
The kerneldoc header of ttm_bo_create() was referring to another (nonexisting) function and had a few obsolete or incorrect arguments. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
708 lines
22 KiB
C
708 lines
22 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_hashtab.h>
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#include <drm/drm_vma_manager.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/mutex.h>
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#include <linux/mm.h>
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#include <linux/bitmap.h>
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#include <linux/reservation.h>
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struct ttm_bo_device;
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struct drm_mm_node;
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/**
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* struct ttm_placement
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*
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* @fpfn: first valid page frame number to put the object
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* @lpfn: last valid page frame number to put the object
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* @num_placement: number of preferred placements
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* @placement: preferred placements
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* @num_busy_placement: number of preferred placements when need to evict buffer
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* @busy_placement: preferred placements when need to evict buffer
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*
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* Structure indicating the placement you request for an object.
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*/
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struct ttm_placement {
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unsigned fpfn;
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unsigned lpfn;
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unsigned num_placement;
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const uint32_t *placement;
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unsigned num_busy_placement;
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const uint32_t *busy_placement;
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};
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/**
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* struct ttm_bus_placement
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*
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* @addr: mapped virtual address
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* @base: bus base address
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* @is_iomem: is this io memory ?
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* @size: size in byte
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* @offset: offset from the base address
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* @io_reserved_vm: The VM system has a refcount in @io_reserved_count
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* @io_reserved_count: Refcounting the numbers of callers to ttm_mem_io_reserve
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*
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* Structure indicating the bus placement of an object.
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*/
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struct ttm_bus_placement {
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void *addr;
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unsigned long base;
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unsigned long size;
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unsigned long offset;
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bool is_iomem;
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bool io_reserved_vm;
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uint64_t io_reserved_count;
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};
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/**
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* struct ttm_mem_reg
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*
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* @mm_node: Memory manager node.
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* @size: Requested size of memory region.
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* @num_pages: Actual size of memory region in pages.
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* @page_alignment: Page alignment.
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* @placement: Placement flags.
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* @bus: Placement on io bus accessible to the CPU
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*
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* Structure indicating the placement and space resources used by a
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* buffer object.
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*/
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struct ttm_mem_reg {
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void *mm_node;
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unsigned long start;
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unsigned long size;
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unsigned long num_pages;
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uint32_t page_alignment;
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uint32_t mem_type;
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uint32_t placement;
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struct ttm_bus_placement bus;
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};
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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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struct ttm_tt;
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/**
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* struct ttm_buffer_object
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*
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* @bdev: Pointer to the buffer object device structure.
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* @type: The bo type.
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* @destroy: Destruction function. If NULL, kfree is used.
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* @num_pages: Actual number of pages.
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* @acc_size: Accounted size for this object.
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* @kref: Reference count of this buffer object. When this refcount reaches
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* zero, the object is put on the delayed delete list.
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* @list_kref: List reference count of this buffer object. This member is
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* used to avoid destruction while the buffer object is still on a list.
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* Lru lists may keep one refcount, the delayed delete list, and kref != 0
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* keeps one refcount. When this refcount reaches zero,
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* the object is destroyed.
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* @mem: structure describing current placement.
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* @persistent_swap_storage: Usually the swap storage is deleted for buffers
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* pinned in physical memory. If this behaviour is not desired, this member
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* holds a pointer to a persistent shmem object.
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* @ttm: TTM structure holding system pages.
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* @evicted: Whether the object was evicted without user-space knowing.
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* @cpu_writes: For synchronization. Number of cpu writers.
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* @lru: List head for the lru list.
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* @ddestroy: List head for the delayed destroy list.
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* @swap: List head for swap LRU list.
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* @sync_obj: Pointer to a synchronization object.
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* @priv_flags: Flags describing buffer object internal state.
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* @vma_node: Address space manager node.
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* @offset: The current GPU offset, which can have different meanings
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* depending on the memory type. For SYSTEM type memory, it should be 0.
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* @cur_placement: Hint of current placement.
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* @wu_mutex: Wait unreserved mutex.
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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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/**
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* Members constant at init.
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*/
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struct ttm_bo_global *glob;
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struct ttm_bo_device *bdev;
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enum ttm_bo_type type;
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void (*destroy) (struct ttm_buffer_object *);
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unsigned long num_pages;
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size_t acc_size;
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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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struct kref list_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_mem_reg mem;
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struct file *persistent_swap_storage;
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struct ttm_tt *ttm;
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bool evicted;
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/**
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* Members protected by the bo::reserved lock only when written to.
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*/
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atomic_t cpu_writers;
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/**
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* Members protected by the bdev::lru_lock.
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*/
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struct list_head lru;
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struct list_head ddestroy;
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struct list_head swap;
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struct list_head io_reserve_lru;
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/**
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* Members protected by struct buffer_object_device::fence_lock
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* In addition, setting sync_obj to anything else
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* than NULL requires bo::reserved to be held. This allows for
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* checking NULL while reserved but not holding the mentioned lock.
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*/
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void *sync_obj;
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unsigned long priv_flags;
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struct drm_vma_offset_node vma_node;
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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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unsigned long offset;
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uint32_t cur_placement;
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struct sg_table *sg;
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struct reservation_object *resv;
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struct reservation_object ttm_resv;
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struct mutex wu_mutex;
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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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* ttm_bo_reference - 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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* Returns a refcounted pointer to a buffer object.
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*/
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static inline struct ttm_buffer_object *
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ttm_bo_reference(struct ttm_buffer_object *bo)
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{
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kref_get(&bo->kref);
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return bo;
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}
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/**
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* ttm_bo_wait - wait for buffer idle.
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*
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* @bo: The buffer object.
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* @interruptible: Use interruptible wait.
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* @no_wait: Return immediately if buffer is busy.
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*
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* This function must be called with the bo::mutex held, and makes
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* sure any previous rendering to the buffer is completed.
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* Note: It might be necessary to block validations before the
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* wait by reserving the buffer.
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* Returns -EBUSY if no_wait is true and the buffer is busy.
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* Returns -ERESTARTSYS if interrupted by a signal.
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*/
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extern int ttm_bo_wait(struct ttm_buffer_object *bo, bool lazy,
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bool interruptible, bool no_wait);
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/**
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* ttm_bo_validate
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*
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* @bo: The buffer object.
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* @placement: Proposed placement for the buffer object.
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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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*
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* Changes placement and caching policy of the buffer object
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* according proposed placement.
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* Returns
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* -EINVAL on invalid proposed placement.
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* -ENOMEM on out-of-memory condition.
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* -EBUSY if no_wait is true and buffer busy.
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* -ERESTARTSYS if interrupted by a signal.
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*/
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extern int ttm_bo_validate(struct ttm_buffer_object *bo,
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struct ttm_placement *placement,
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bool interruptible,
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bool no_wait_gpu);
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/**
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* ttm_bo_unref
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*
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* @bo: The buffer object.
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*
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* Unreference and clear a pointer to a buffer object.
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*/
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extern void ttm_bo_unref(struct ttm_buffer_object **bo);
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/**
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* ttm_bo_list_ref_sub
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*
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* @bo: The buffer object.
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* @count: The number of references with which to decrease @bo::list_kref;
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* @never_free: The refcount should not reach zero with this operation.
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*
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* Release @count lru list references to this buffer object.
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*/
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extern void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
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bool never_free);
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/**
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* ttm_bo_add_to_lru
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*
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* @bo: The buffer object.
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*
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* Add this bo to the relevant mem type lru and, if it's backed by
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* system pages (ttms) to the swap list.
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* This function must be called with struct ttm_bo_global::lru_lock held, and
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* is typically called immediately prior to unreserving a bo.
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*/
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extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo);
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/**
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* ttm_bo_del_from_lru
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*
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* @bo: The buffer object.
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*
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* Remove this bo from all lru lists used to lookup and reserve an object.
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* This function must be called with struct ttm_bo_global::lru_lock held,
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* and is usually called just immediately after the bo has been reserved to
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* avoid recursive reservation from lru lists.
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*/
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extern int ttm_bo_del_from_lru(struct ttm_buffer_object *bo);
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/**
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* ttm_bo_lock_delayed_workqueue
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*
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* Prevent the delayed workqueue from running.
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* Returns
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* True if the workqueue was queued at the time
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*/
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extern int ttm_bo_lock_delayed_workqueue(struct ttm_bo_device *bdev);
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/**
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* ttm_bo_unlock_delayed_workqueue
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*
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* Allows the delayed workqueue to run.
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*/
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extern void ttm_bo_unlock_delayed_workqueue(struct ttm_bo_device *bdev,
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int resched);
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/**
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* ttm_bo_synccpu_write_grab
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*
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* @bo: The buffer object:
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* @no_wait: Return immediately if buffer is busy.
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*
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* Synchronizes a buffer object for CPU RW access. This means
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* command submission that affects the buffer will return -EBUSY
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* until ttm_bo_synccpu_write_release is called.
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*
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* Returns
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* -EBUSY if the buffer is busy and no_wait is true.
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* -ERESTARTSYS if interrupted by a signal.
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*/
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extern int
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ttm_bo_synccpu_write_grab(struct ttm_buffer_object *bo, bool no_wait);
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/**
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* ttm_bo_synccpu_write_release:
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*
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* @bo : The buffer object.
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*
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* Releases a synccpu lock.
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*/
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extern void ttm_bo_synccpu_write_release(struct ttm_buffer_object *bo);
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/**
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* ttm_bo_acc_size
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*
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* @bdev: Pointer to a ttm_bo_device struct.
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* @bo_size: size of the buffer object in byte.
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* @struct_size: size of the structure holding buffer object datas
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*
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* Returns size to account for a buffer object
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*/
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size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
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unsigned long bo_size,
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unsigned struct_size);
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size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
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unsigned long bo_size,
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unsigned struct_size);
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/**
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* ttm_bo_init
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*
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* @bdev: Pointer to a ttm_bo_device struct.
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* @bo: Pointer to a ttm_buffer_object to be initialized.
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* @size: Requested size of buffer object.
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* @type: Requested type of buffer object.
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* @flags: Initial placement flags.
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* @page_alignment: Data alignment in pages.
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* @interruptible: If needing to sleep to wait for GPU resources,
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* sleep interruptible.
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* @persistent_swap_storage: Usually the swap storage is deleted for buffers
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* pinned in physical memory. If this behaviour is not desired, this member
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* holds a pointer to a persistent shmem object. Typically, this would
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* point to the shmem object backing a GEM object if TTM is used to back a
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* GEM user interface.
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* @acc_size: Accounted size for this object.
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* @destroy: Destroy function. Use NULL for kfree().
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*
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* This function initializes a pre-allocated struct ttm_buffer_object.
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* As this object may be part of a larger structure, this function,
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* together with the @destroy function,
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* enables driver-specific objects derived from a ttm_buffer_object.
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* On successful return, the object kref and list_kref are set to 1.
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* If a failure occurs, the function will call the @destroy function, or
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* kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is
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* illegal and will likely cause memory corruption.
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*
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* Returns
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* -ENOMEM: Out of memory.
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* -EINVAL: Invalid placement flags.
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* -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources.
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*/
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extern int ttm_bo_init(struct ttm_bo_device *bdev,
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struct ttm_buffer_object *bo,
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unsigned long size,
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enum ttm_bo_type type,
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struct ttm_placement *placement,
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uint32_t page_alignment,
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bool interrubtible,
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struct file *persistent_swap_storage,
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size_t acc_size,
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struct sg_table *sg,
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void (*destroy) (struct ttm_buffer_object *));
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/**
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* ttm_bo_create
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*
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* @bdev: Pointer to a ttm_bo_device struct.
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* @size: Requested size of buffer object.
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* @type: Requested type of buffer object.
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* @placement: Initial placement.
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* @page_alignment: Data alignment in pages.
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* @interruptible: If needing to sleep while waiting for GPU resources,
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* sleep interruptible.
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* @persistent_swap_storage: Usually the swap storage is deleted for buffers
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* pinned in physical memory. If this behaviour is not desired, this member
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* holds a pointer to a persistent shmem object. Typically, this would
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* point to the shmem object backing a GEM object if TTM is used to back a
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* GEM user interface.
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* @p_bo: On successful completion *p_bo points to the created object.
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*
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* This function allocates a ttm_buffer_object, and then calls ttm_bo_init
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* on that object. The destroy function is set to kfree().
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|
* 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
|