forked from Minki/linux
21c5b3c6d7
legacy: - fix drm_local_map.offset type ttm: - temporarily disable hugepages to debug amdgpu problems. prime: - fix sg extraction amdgpu: - Various Renoir fixes - Fix gfx clockgating sequence on gfx10 - RAS fixes - Avoid MST property creation after registration - Various cursor/viewport fixes - Fix a confusing log message about optional firmwares i915: - Flush all the reloc_gpu batch (Chris) - Ignore readonly failures when updating relocs (Chris) - Fill all the unused space in the GGTT (Chris) - Return the right vswing table (Jose) - Don't enable DDI IO power on a TypeC port in TBT mode for ICL+ (Imre) analogix_dp: - probe fix virtio: - oob fix in object create -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJej453AAoJEAx081l5xIa+r7YQAIX48cUROehoNDhzEHnAxJuU WZXNHKaMCaDPzAs6SyCtHiPFWH6trBR5McE2dXfg6qc33lnzROFNp5PLB7qb4O+q +3QkJ5cGd1bohT7vn3omP9FxxZeD4H4bE/zat+yUPwMWJYSUz4m6w6Ya0rIPa8HS d9nRL0Y6wGBhm8/E0WCB6fe5G96D1JOFGLhfbVajGlDW/I+eBiS5WEyrtlIW698K Q7lTNOXKEi9kFEZiW39RbKwW3YwqOEiQf1k0KbvUqctq4qLskHD3MgJpmkAiGVPH mSnTYPPyATILVGKcmEHR3oB9wuYsoPhNgGCVhhm1MppI8GVUzfk6uqOfdK8UNfDU IRAZ05AynmMMFNu/4Fw0SyR1sbj4OtAiG0hWaJ6Ou9MBzhERGXfT3+/BzeHsR4MJ +fVIbOArSCAeFTAkqcLVbMKjivAJjullpsj36DFn+lXmHnxB98zAkSNT5dQcDjzl bp6FhJXm7pWYx8SvkGRneESqLdr2WVgyZmP6u+kgzZ5pPubWSDqY1IFu1exb5Sne bf7HoPzQ6LyD5KgX5WdoJ5++bcvQ9G4/qDF96NY6emCMKcwnOaAzvtErxQLpFeWP dZwnxHXXtxY4Z4r5bFURPeWX3rWX5f/cCZ8B7mTUDSTa4hgzV8yUX3ZQBc+9Knja zuvnpm4j1BXFqOg0Xfsu =ZTAf -----END PGP SIGNATURE----- Merge tag 'drm-next-2020-04-10' of git://anongit.freedesktop.org/drm/drm Pull more drm fixes from Dave Airlie: "As expected, more fixes did turn up in the latter part of the week. The drm_local_map build regression fix is here, along with temporary disabling of the hugepage work due to some amdgpu related crashes. Otherwise it's just a bunch of i915, and amdgpu fixes. legacy: - fix drm_local_map.offset type ttm: - temporarily disable hugepages to debug amdgpu problems. prime: - fix sg extraction amdgpu: - Various Renoir fixes - Fix gfx clockgating sequence on gfx10 - RAS fixes - Avoid MST property creation after registration - Various cursor/viewport fixes - Fix a confusing log message about optional firmwares i915: - Flush all the reloc_gpu batch (Chris) - Ignore readonly failures when updating relocs (Chris) - Fill all the unused space in the GGTT (Chris) - Return the right vswing table (Jose) - Don't enable DDI IO power on a TypeC port in TBT mode for ICL+ (Imre) analogix_dp: - probe fix virtio: - oob fix in object create" * tag 'drm-next-2020-04-10' of git://anongit.freedesktop.org/drm/drm: (34 commits) drm/ttm: Temporarily disable the huge_fault() callback drm/bridge: analogix_dp: Split bind() into probe() and real bind() drm/legacy: Fix type for drm_local_map.offset drm/amdgpu/display: fix warning when compiling without debugfs drm/amdgpu: unify fw_write_wait for new gfx9 asics drm/amd/powerplay: error out on forcing clock setting not supported drm/amdgpu: fix gfx hang during suspend with video playback (v2) drm/amd/display: Check for null fclk voltage when parsing clock table drm/amd/display: Acknowledge wm_optimized_required drm/amd/display: Make cursor source translation adjustment optional drm/amd/display: Calculate scaling ratios on every medium/full update drm/amd/display: Program viewport when source pos changes for DCN20 hw seq drm/amd/display: Fix incorrect cursor pos on scaled primary plane drm/amd/display: change default pipe_split policy for DCN1 drm/amd/display: Translate cursor position by source rect drm/amd/display: Update stream adjust in dc_stream_adjust_vmin_vmax drm/amd/display: Avoid create MST prop after registration drm/amdgpu/psp: dont warn on missing optional TA's drm/amdgpu: update RAS related dmesg print drm/amdgpu: resolve mGPU RAS query instability ...
633 lines
17 KiB
C
633 lines
17 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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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. We only do this if the fault allows retry and this
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* is the first attempt.
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*/
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if (fault_flag_allow_retry_first(vmf->flags)) {
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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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dma_resv_unlock(bo->base.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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/**
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* ttm_bo_vm_reserve - Reserve a buffer object in a retryable vm callback
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* @bo: The buffer object
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* @vmf: The fault structure handed to the callback
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*
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* vm callbacks like fault() and *_mkwrite() allow for the mm_sem to be dropped
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* during long waits, and after the wait the callback will be restarted. This
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* is to allow other threads using the same virtual memory space concurrent
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* access to map(), unmap() completely unrelated buffer objects. TTM buffer
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* object reservations sometimes wait for GPU and should therefore be
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* considered long waits. This function reserves the buffer object interruptibly
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* taking this into account. Starvation is avoided by the vm system not
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* allowing too many repeated restarts.
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* This function is intended to be used in customized fault() and _mkwrite()
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* handlers.
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*
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* Return:
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* 0 on success and the bo was reserved.
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* VM_FAULT_RETRY if blocking wait.
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* VM_FAULT_NOPAGE if blocking wait and retrying was not allowed.
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*/
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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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{
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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(!dma_resv_trylock(bo->base.resv))) {
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/*
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* If the fault allows retry and this is the first
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* fault attempt, we try to release the mmap_sem
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* before waiting
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*/
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if (fault_flag_allow_retry_first(vmf->flags)) {
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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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if (!dma_resv_lock_interruptible(bo->base.resv,
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NULL))
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dma_resv_unlock(bo->base.resv);
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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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if (dma_resv_lock_interruptible(bo->base.resv, NULL))
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return VM_FAULT_NOPAGE;
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}
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return 0;
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}
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EXPORT_SYMBOL(ttm_bo_vm_reserve);
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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/**
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* ttm_bo_vm_insert_huge - Insert a pfn for PUD or PMD faults
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* @vmf: Fault data
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* @bo: The buffer object
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* @page_offset: Page offset from bo start
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* @fault_page_size: The size of the fault in pages.
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* @pgprot: The page protections.
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* Does additional checking whether it's possible to insert a PUD or PMD
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* pfn and performs the insertion.
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*
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* Return: VM_FAULT_NOPAGE on successful insertion, VM_FAULT_FALLBACK if
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* a huge fault was not possible, or on insertion error.
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*/
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static vm_fault_t ttm_bo_vm_insert_huge(struct vm_fault *vmf,
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struct ttm_buffer_object *bo,
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pgoff_t page_offset,
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pgoff_t fault_page_size,
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pgprot_t pgprot)
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{
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pgoff_t i;
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vm_fault_t ret;
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unsigned long pfn;
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pfn_t pfnt;
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struct ttm_tt *ttm = bo->ttm;
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bool write = vmf->flags & FAULT_FLAG_WRITE;
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/* Fault should not cross bo boundary. */
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page_offset &= ~(fault_page_size - 1);
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if (page_offset + fault_page_size > bo->num_pages)
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goto out_fallback;
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if (bo->mem.bus.is_iomem)
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pfn = ttm_bo_io_mem_pfn(bo, page_offset);
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else
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pfn = page_to_pfn(ttm->pages[page_offset]);
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/* pfn must be fault_page_size aligned. */
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if ((pfn & (fault_page_size - 1)) != 0)
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goto out_fallback;
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/* Check that memory is contiguous. */
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if (!bo->mem.bus.is_iomem) {
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for (i = 1; i < fault_page_size; ++i) {
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if (page_to_pfn(ttm->pages[page_offset + i]) != pfn + i)
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goto out_fallback;
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}
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} else if (bo->bdev->driver->io_mem_pfn) {
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for (i = 1; i < fault_page_size; ++i) {
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if (ttm_bo_io_mem_pfn(bo, page_offset + i) != pfn + i)
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goto out_fallback;
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}
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}
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pfnt = __pfn_to_pfn_t(pfn, PFN_DEV);
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if (fault_page_size == (HPAGE_PMD_SIZE >> PAGE_SHIFT))
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ret = vmf_insert_pfn_pmd_prot(vmf, pfnt, pgprot, write);
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#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
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else if (fault_page_size == (HPAGE_PUD_SIZE >> PAGE_SHIFT))
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ret = vmf_insert_pfn_pud_prot(vmf, pfnt, pgprot, write);
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#endif
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else
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WARN_ON_ONCE(ret = VM_FAULT_FALLBACK);
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if (ret != VM_FAULT_NOPAGE)
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goto out_fallback;
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return VM_FAULT_NOPAGE;
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out_fallback:
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count_vm_event(THP_FAULT_FALLBACK);
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return VM_FAULT_FALLBACK;
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}
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#else
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static vm_fault_t ttm_bo_vm_insert_huge(struct vm_fault *vmf,
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struct ttm_buffer_object *bo,
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pgoff_t page_offset,
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pgoff_t fault_page_size,
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pgprot_t pgprot)
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{
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return VM_FAULT_FALLBACK;
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}
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#endif
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/**
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* ttm_bo_vm_fault_reserved - TTM fault helper
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* @vmf: The struct vm_fault given as argument to the fault callback
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* @prot: The page protection to be used for this memory area.
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* @num_prefault: Maximum number of prefault pages. The caller may want to
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* specify this based on madvice settings and the size of the GPU object
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* backed by the memory.
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* @fault_page_size: The size of the fault in pages.
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*
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* This function inserts one or more page table entries pointing to the
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* memory backing the buffer object, and then returns a return code
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* instructing the caller to retry the page access.
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*
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* Return:
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* VM_FAULT_NOPAGE on success or pending signal
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* VM_FAULT_SIGBUS on unspecified error
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* VM_FAULT_OOM on out-of-memory
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* VM_FAULT_RETRY if retryable wait
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*/
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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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pgoff_t fault_page_size)
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{
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struct vm_area_struct *vma = vmf->vma;
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struct ttm_buffer_object *bo = 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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pgoff_t 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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/*
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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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return VM_FAULT_SIGBUS;
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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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return VM_FAULT_NOPAGE;
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default:
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return VM_FAULT_SIGBUS;
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}
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if (bo->moving != moving) {
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spin_lock(&ttm_bo_glob.lru_lock);
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ttm_bo_move_to_lru_tail(bo, NULL);
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spin_unlock(&ttm_bo_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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return ret;
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err = ttm_mem_io_lock(man, true);
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if (unlikely(err != 0))
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return VM_FAULT_NOPAGE;
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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->base.vma_node);
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page_last = vma_pages(vma) + vma->vm_pgoff -
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drm_vma_node_start(&bo->base.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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prot = ttm_io_prot(bo->mem.placement, prot);
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if (!bo->mem.bus.is_iomem) {
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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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if (ttm_tt_populate(bo->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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} else {
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/* Iomem should not be marked encrypted */
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prot = pgprot_decrypted(prot);
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}
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/* We don't prefault on huge faults. Yet. */
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if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && fault_page_size != 1) {
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ret = ttm_bo_vm_insert_huge(vmf, bo, page_offset,
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fault_page_size, prot);
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goto out_io_unlock;
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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 < num_prefault; ++i) {
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if (bo->mem.bus.is_iomem) {
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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->base.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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/*
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* Note that the value of @prot at this point may differ from
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* the value of @vma->vm_page_prot in the caching- and
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* encryption bits. This is because the exact location of the
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* data may not be known at mmap() time and may also change
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* at arbitrary times while the data is mmap'ed.
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* See vmf_insert_mixed_prot() for a discussion.
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*/
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if (vma->vm_flags & VM_MIXEDMAP)
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ret = vmf_insert_mixed_prot(vma, address,
|
|
__pfn_to_pfn_t(pfn, PFN_DEV),
|
|
prot);
|
|
else
|
|
ret = vmf_insert_pfn_prot(vma, address, pfn, prot);
|
|
|
|
/* Never error on prefaulted PTEs */
|
|
if (unlikely((ret & VM_FAULT_ERROR))) {
|
|
if (i == 0)
|
|
goto out_io_unlock;
|
|
else
|
|
break;
|
|
}
|
|
|
|
address += PAGE_SIZE;
|
|
if (unlikely(++page_offset >= page_last))
|
|
break;
|
|
}
|
|
ret = VM_FAULT_NOPAGE;
|
|
out_io_unlock:
|
|
ttm_mem_io_unlock(man);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_vm_fault_reserved);
|
|
|
|
vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
pgprot_t prot;
|
|
struct ttm_buffer_object *bo = vma->vm_private_data;
|
|
vm_fault_t ret;
|
|
|
|
ret = ttm_bo_vm_reserve(bo, vmf);
|
|
if (ret)
|
|
return ret;
|
|
|
|
prot = vma->vm_page_prot;
|
|
ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
|
|
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
|
|
return ret;
|
|
|
|
dma_resv_unlock(bo->base.resv);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_vm_fault);
|
|
|
|
void ttm_bo_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct ttm_buffer_object *bo = vma->vm_private_data;
|
|
|
|
WARN_ON(bo->bdev->dev_mapping != vma->vm_file->f_mapping);
|
|
|
|
ttm_bo_get(bo);
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_vm_open);
|
|
|
|
void ttm_bo_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct ttm_buffer_object *bo = vma->vm_private_data;
|
|
|
|
ttm_bo_put(bo);
|
|
vma->vm_private_data = NULL;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_vm_close);
|
|
|
|
static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
|
|
unsigned long offset,
|
|
uint8_t *buf, int len, int write)
|
|
{
|
|
unsigned long page = offset >> PAGE_SHIFT;
|
|
unsigned long bytes_left = len;
|
|
int ret;
|
|
|
|
/* Copy a page at a time, that way no extra virtual address
|
|
* mapping is needed
|
|
*/
|
|
offset -= page << PAGE_SHIFT;
|
|
do {
|
|
unsigned long bytes = min(bytes_left, PAGE_SIZE - offset);
|
|
struct ttm_bo_kmap_obj map;
|
|
void *ptr;
|
|
bool is_iomem;
|
|
|
|
ret = ttm_bo_kmap(bo, page, 1, &map);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset;
|
|
WARN_ON_ONCE(is_iomem);
|
|
if (write)
|
|
memcpy(ptr, buf, bytes);
|
|
else
|
|
memcpy(buf, ptr, bytes);
|
|
ttm_bo_kunmap(&map);
|
|
|
|
page++;
|
|
buf += bytes;
|
|
bytes_left -= bytes;
|
|
offset = 0;
|
|
} while (bytes_left);
|
|
|
|
return len;
|
|
}
|
|
|
|
int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
|
|
void *buf, int len, int write)
|
|
{
|
|
unsigned long offset = (addr) - vma->vm_start;
|
|
struct ttm_buffer_object *bo = vma->vm_private_data;
|
|
int ret;
|
|
|
|
if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->num_pages)
|
|
return -EIO;
|
|
|
|
ret = ttm_bo_reserve(bo, true, false, NULL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
switch (bo->mem.mem_type) {
|
|
case TTM_PL_SYSTEM:
|
|
if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
|
|
ret = ttm_tt_swapin(bo->ttm);
|
|
if (unlikely(ret != 0))
|
|
return ret;
|
|
}
|
|
/* fall through */
|
|
case TTM_PL_TT:
|
|
ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
|
|
break;
|
|
default:
|
|
if (bo->bdev->driver->access_memory)
|
|
ret = bo->bdev->driver->access_memory(
|
|
bo, offset, buf, len, write);
|
|
else
|
|
ret = -EIO;
|
|
}
|
|
|
|
ttm_bo_unreserve(bo);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_vm_access);
|
|
|
|
static const struct vm_operations_struct ttm_bo_vm_ops = {
|
|
.fault = ttm_bo_vm_fault,
|
|
.open = ttm_bo_vm_open,
|
|
.close = ttm_bo_vm_close,
|
|
.access = ttm_bo_vm_access,
|
|
};
|
|
|
|
static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,
|
|
unsigned long offset,
|
|
unsigned long pages)
|
|
{
|
|
struct drm_vma_offset_node *node;
|
|
struct ttm_buffer_object *bo = NULL;
|
|
|
|
drm_vma_offset_lock_lookup(bdev->vma_manager);
|
|
|
|
node = drm_vma_offset_lookup_locked(bdev->vma_manager, offset, pages);
|
|
if (likely(node)) {
|
|
bo = container_of(node, struct ttm_buffer_object,
|
|
base.vma_node);
|
|
bo = ttm_bo_get_unless_zero(bo);
|
|
}
|
|
|
|
drm_vma_offset_unlock_lookup(bdev->vma_manager);
|
|
|
|
if (!bo)
|
|
pr_err("Could not find buffer object to map\n");
|
|
|
|
return bo;
|
|
}
|
|
|
|
static void ttm_bo_mmap_vma_setup(struct ttm_buffer_object *bo, struct vm_area_struct *vma)
|
|
{
|
|
vma->vm_ops = &ttm_bo_vm_ops;
|
|
|
|
/*
|
|
* Note: We're transferring the bo reference to
|
|
* vma->vm_private_data here.
|
|
*/
|
|
|
|
vma->vm_private_data = bo;
|
|
|
|
/*
|
|
* We'd like to use VM_PFNMAP on shared mappings, where
|
|
* (vma->vm_flags & VM_SHARED) != 0, for performance reasons,
|
|
* but for some reason VM_PFNMAP + x86 PAT + write-combine is very
|
|
* bad for performance. Until that has been sorted out, use
|
|
* VM_MIXEDMAP on all mappings. See freedesktop.org bug #75719
|
|
*/
|
|
vma->vm_flags |= VM_MIXEDMAP;
|
|
vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
|
|
}
|
|
|
|
int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma,
|
|
struct ttm_bo_device *bdev)
|
|
{
|
|
struct ttm_bo_driver *driver;
|
|
struct ttm_buffer_object *bo;
|
|
int ret;
|
|
|
|
if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET_START))
|
|
return -EINVAL;
|
|
|
|
bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma));
|
|
if (unlikely(!bo))
|
|
return -EINVAL;
|
|
|
|
driver = bo->bdev->driver;
|
|
if (unlikely(!driver->verify_access)) {
|
|
ret = -EPERM;
|
|
goto out_unref;
|
|
}
|
|
ret = driver->verify_access(bo, filp);
|
|
if (unlikely(ret != 0))
|
|
goto out_unref;
|
|
|
|
ttm_bo_mmap_vma_setup(bo, vma);
|
|
return 0;
|
|
out_unref:
|
|
ttm_bo_put(bo);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_mmap);
|
|
|
|
int ttm_bo_mmap_obj(struct vm_area_struct *vma, struct ttm_buffer_object *bo)
|
|
{
|
|
ttm_bo_get(bo);
|
|
ttm_bo_mmap_vma_setup(bo, vma);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ttm_bo_mmap_obj);
|