![Christian König](/assets/img/avatar_default.png)
Move the BO on the LRU only when it is actually moved by a DMA operation. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Tested-And-Reviewed-by: Chunming Zhou <david1.zhou@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
487 lines
12 KiB
C
487 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/**************************************************************************
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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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#define pr_fmt(fmt) "[TTM] " fmt
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#include <drm/ttm/ttm_module.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_placement.h>
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#include <drm/drm_vma_manager.h>
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#include <linux/mm.h>
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#include <linux/pfn_t.h>
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#include <linux/rbtree.h>
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#include <linux/module.h>
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#include <linux/uaccess.h>
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#include <linux/mem_encrypt.h>
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#define TTM_BO_VM_NUM_PREFAULT 16
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static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
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struct vm_fault *vmf)
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{
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vm_fault_t ret = 0;
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int err = 0;
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if (likely(!bo->moving))
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goto out_unlock;
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/*
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* Quick non-stalling check for idle.
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*/
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if (dma_fence_is_signaled(bo->moving))
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goto out_clear;
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/*
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* If possible, avoid waiting for GPU with mmap_sem
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* held.
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*/
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if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
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ret = VM_FAULT_RETRY;
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if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
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goto out_unlock;
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ttm_bo_get(bo);
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up_read(&vmf->vma->vm_mm->mmap_sem);
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(void) dma_fence_wait(bo->moving, true);
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reservation_object_unlock(bo->resv);
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ttm_bo_put(bo);
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goto out_unlock;
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}
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/*
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* Ordinary wait.
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*/
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err = dma_fence_wait(bo->moving, true);
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if (unlikely(err != 0)) {
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ret = (err != -ERESTARTSYS) ? VM_FAULT_SIGBUS :
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VM_FAULT_NOPAGE;
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goto out_unlock;
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}
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out_clear:
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dma_fence_put(bo->moving);
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bo->moving = NULL;
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out_unlock:
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return ret;
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}
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static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
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unsigned long page_offset)
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{
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struct ttm_bo_device *bdev = bo->bdev;
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if (bdev->driver->io_mem_pfn)
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return bdev->driver->io_mem_pfn(bo, page_offset);
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return ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT)
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+ page_offset;
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}
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static vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
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vma->vm_private_data;
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struct ttm_bo_device *bdev = bo->bdev;
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unsigned long page_offset;
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unsigned long page_last;
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unsigned long pfn;
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struct ttm_tt *ttm = NULL;
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struct page *page;
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int err;
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int i;
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vm_fault_t ret = VM_FAULT_NOPAGE;
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unsigned long address = vmf->address;
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struct ttm_mem_type_manager *man =
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&bdev->man[bo->mem.mem_type];
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struct vm_area_struct cvma;
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/*
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* Work around locking order reversal in fault / nopfn
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* between mmap_sem and bo_reserve: Perform a trylock operation
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* for reserve, and if it fails, retry the fault after waiting
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* for the buffer to become unreserved.
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*/
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if (unlikely(!reservation_object_trylock(bo->resv))) {
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if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) {
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if (!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
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ttm_bo_get(bo);
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up_read(&vmf->vma->vm_mm->mmap_sem);
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(void) ttm_bo_wait_unreserved(bo);
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ttm_bo_put(bo);
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}
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return VM_FAULT_RETRY;
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}
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/*
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* If we'd want to change locking order to
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* mmap_sem -> bo::reserve, we'd use a blocking reserve here
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* instead of retrying the fault...
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*/
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return VM_FAULT_NOPAGE;
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}
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/*
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* Refuse to fault imported pages. This should be handled
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* (if at all) by redirecting mmap to the exporter.
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*/
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if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_SG)) {
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ret = VM_FAULT_SIGBUS;
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goto out_unlock;
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}
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if (bdev->driver->fault_reserve_notify) {
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struct dma_fence *moving = dma_fence_get(bo->moving);
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err = bdev->driver->fault_reserve_notify(bo);
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switch (err) {
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case 0:
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break;
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case -EBUSY:
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case -ERESTARTSYS:
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ret = VM_FAULT_NOPAGE;
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goto out_unlock;
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default:
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ret = VM_FAULT_SIGBUS;
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goto out_unlock;
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}
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if (bo->moving != moving) {
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spin_lock(&bdev->glob->lru_lock);
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ttm_bo_move_to_lru_tail(bo, NULL);
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spin_unlock(&bdev->glob->lru_lock);
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}
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dma_fence_put(moving);
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}
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/*
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* Wait for buffer data in transit, due to a pipelined
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* move.
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*/
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ret = ttm_bo_vm_fault_idle(bo, vmf);
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if (unlikely(ret != 0)) {
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if (ret == VM_FAULT_RETRY &&
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!(vmf->flags & FAULT_FLAG_RETRY_NOWAIT)) {
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/* The BO has already been unreserved. */
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return ret;
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}
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goto out_unlock;
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}
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err = ttm_mem_io_lock(man, true);
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if (unlikely(err != 0)) {
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ret = VM_FAULT_NOPAGE;
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goto out_unlock;
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}
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err = ttm_mem_io_reserve_vm(bo);
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if (unlikely(err != 0)) {
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ret = VM_FAULT_SIGBUS;
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goto out_io_unlock;
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}
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page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
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vma->vm_pgoff - drm_vma_node_start(&bo->vma_node);
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page_last = vma_pages(vma) + vma->vm_pgoff -
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drm_vma_node_start(&bo->vma_node);
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if (unlikely(page_offset >= bo->num_pages)) {
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ret = VM_FAULT_SIGBUS;
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goto out_io_unlock;
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}
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/*
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* Make a local vma copy to modify the page_prot member
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* and vm_flags if necessary. The vma parameter is protected
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* by mmap_sem in write mode.
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*/
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cvma = *vma;
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cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags);
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if (bo->mem.bus.is_iomem) {
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cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
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cvma.vm_page_prot);
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} else {
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struct ttm_operation_ctx ctx = {
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.interruptible = false,
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.no_wait_gpu = false,
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.flags = TTM_OPT_FLAG_FORCE_ALLOC
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};
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ttm = bo->ttm;
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cvma.vm_page_prot = ttm_io_prot(bo->mem.placement,
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cvma.vm_page_prot);
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/* Allocate all page at once, most common usage */
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if (ttm_tt_populate(ttm, &ctx)) {
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ret = VM_FAULT_OOM;
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goto out_io_unlock;
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}
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}
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/*
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* Speculatively prefault a number of pages. Only error on
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* first page.
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*/
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for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) {
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if (bo->mem.bus.is_iomem) {
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/* Iomem should not be marked encrypted */
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cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
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pfn = ttm_bo_io_mem_pfn(bo, page_offset);
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} else {
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page = ttm->pages[page_offset];
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if (unlikely(!page && i == 0)) {
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ret = VM_FAULT_OOM;
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goto out_io_unlock;
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} else if (unlikely(!page)) {
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break;
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}
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page->index = drm_vma_node_start(&bo->vma_node) +
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page_offset;
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pfn = page_to_pfn(page);
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}
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if (vma->vm_flags & VM_MIXEDMAP)
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ret = vmf_insert_mixed(&cvma, address,
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__pfn_to_pfn_t(pfn, PFN_DEV));
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else
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ret = vmf_insert_pfn(&cvma, address, pfn);
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/*
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* Somebody beat us to this PTE or prefaulting to
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* an already populated PTE, or prefaulting error.
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*/
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if (unlikely((ret == VM_FAULT_NOPAGE && i > 0)))
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break;
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else if (unlikely(ret & VM_FAULT_ERROR))
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goto out_io_unlock;
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address += PAGE_SIZE;
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if (unlikely(++page_offset >= page_last))
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break;
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}
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ret = VM_FAULT_NOPAGE;
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out_io_unlock:
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ttm_mem_io_unlock(man);
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out_unlock:
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reservation_object_unlock(bo->resv);
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return ret;
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}
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static void ttm_bo_vm_open(struct vm_area_struct *vma)
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{
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struct ttm_buffer_object *bo =
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(struct ttm_buffer_object *)vma->vm_private_data;
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WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
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ttm_bo_get(bo);
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}
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static void ttm_bo_vm_close(struct vm_area_struct *vma)
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{
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struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data;
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ttm_bo_put(bo);
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vma->vm_private_data = NULL;
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}
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static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
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unsigned long offset,
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uint8_t *buf, int len, int write)
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{
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unsigned long page = offset >> PAGE_SHIFT;
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unsigned long bytes_left = len;
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int ret;
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/* Copy a page at a time, that way no extra virtual address
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* mapping is needed
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*/
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offset -= page << PAGE_SHIFT;
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do {
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unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);
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struct ttm_bo_kmap_obj map;
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void *ptr;
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bool is_iomem;
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ret = ttm_bo_kmap(bo, page, 1, &map);
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if (ret)
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return ret;
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ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset;
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WARN_ON_ONCE(is_iomem);
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if (write)
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memcpy(ptr, buf, bytes);
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else
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memcpy(buf, ptr, bytes);
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ttm_bo_kunmap(&map);
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page++;
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buf += bytes;
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bytes_left -= bytes;
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offset = 0;
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} while (bytes_left);
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return len;
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}
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static 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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{
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unsigned long offset = (addr) - vma->vm_start;
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struct ttm_buffer_object *bo = vma->vm_private_data;
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int ret;
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if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
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return -EIO;
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ret = ttm_bo_reserve(bo, true, false, NULL);
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if (ret)
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return ret;
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switch (bo->mem.mem_type) {
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case TTM_PL_SYSTEM:
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if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
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ret = ttm_tt_swapin(bo->ttm);
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if (unlikely(ret != 0))
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return ret;
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}
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/* fall through */
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case TTM_PL_TT:
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ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
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break;
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default:
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if (bo->bdev->driver->access_memory)
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ret = bo->bdev->driver->access_memory(
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bo, offset, buf, len, write);
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else
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ret = -EIO;
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}
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ttm_bo_unreserve(bo);
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return ret;
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}
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static const struct vm_operations_struct ttm_bo_vm_ops = {
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.fault = ttm_bo_vm_fault,
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.open = ttm_bo_vm_open,
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.close = ttm_bo_vm_close,
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.access = ttm_bo_vm_access
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};
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static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
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unsigned long offset,
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unsigned long pages)
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{
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struct drm_vma_offset_node *node;
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struct ttm_buffer_object *bo = NULL;
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drm_vma_offset_lock_lookup(&bdev->vma_manager);
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node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages);
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if (likely(node)) {
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bo = container_of(node, struct ttm_buffer_object, vma_node);
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bo = ttm_bo_get_unless_zero(bo);
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}
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drm_vma_offset_unlock_lookup(&bdev->vma_manager);
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if (!bo)
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pr_err("Could not find buffer object to map\n");
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return bo;
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}
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int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
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struct ttm_bo_device *bdev)
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{
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struct ttm_bo_driver *driver;
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struct ttm_buffer_object *bo;
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int ret;
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bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
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if (unlikely(!bo))
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return -EINVAL;
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driver = bo->bdev->driver;
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if (unlikely(!driver->verify_access)) {
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ret = -EPERM;
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goto out_unref;
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}
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ret = driver->verify_access(bo, filp);
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if (unlikely(ret != 0))
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goto out_unref;
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vma->vm_ops = &ttm_bo_vm_ops;
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/*
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* Note: We're transferring the bo reference to
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* vma->vm_private_data here.
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*/
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vma->vm_private_data = bo;
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/*
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* We'd like to use VM_PFNMAP on shared mappings, where
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* (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
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* but for some reason VM_PFNMAP + x86 PAT + write-combine is very
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* bad for performance. Until that has been sorted out, use
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* VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
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*/
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vma->vm_flags |= VM_MIXEDMAP;
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vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
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return 0;
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out_unref:
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ttm_bo_put(bo);
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return ret;
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}
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EXPORT_SYMBOL(ttm_bo_mmap);
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int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
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{
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if (vma->vm_pgoff != 0)
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return -EACCES;
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ttm_bo_get(bo);
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vma->vm_ops = &ttm_bo_vm_ops;
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vma->vm_private_data = bo;
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vma->vm_flags |= VM_MIXEDMAP;
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vma->vm_flags |= VM_IO | VM_DONTEXPAND;
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return 0;
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}
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EXPORT_SYMBOL(ttm_fbdev_mmap);
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