/* * Copyright 2014 Advanced Micro Devices, Inc. * All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sub license, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE * USE OR OTHER DEALINGS IN THE SOFTWARE. * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * *//* * Authors: *    Christian König <christian.koenig@amd.com> */ /** * DOC: MMU Notifier * * For coherent userptr handling registers an MMU notifier to inform the driver * about updates on the page tables of a process. * * When somebody tries to invalidate the page tables we block the update until * all operations on the pages in question are completed, then those pages are * marked as accessed and also dirty if it wasn't a read only access. * * New command submissions using the userptrs in question are delayed until all * page table invalidation are completed and we once more see a coherent process * address space. */ #include <linux/firmware.h>#include <linux/module.h>#include <drm/drm.h> #include "amdgpu.h"#include "amdgpu_amdkfd.h" /** * amdgpu_mn_invalidate_gfx - callback to notify about mm change * * @mni: the range (mm) is about to update * @range: details on the invalidation * @cur_seq: Value to pass to mmu_interval_set_seq() * * Block for operations on BOs to finish and mark pages as accessed and * potentially dirty. */static bool amdgpu_mn_invalidate_gfx(struct mmu_interval_notifier *mni,				     const struct mmu_notifier_range *range,				     unsigned long cur_seq){	struct amdgpu_bo *bo = container_of(mni, struct amdgpu_bo, notifier);	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);	long r; 	if (!mmu_notifier_range_blockable(range))		return false; 	mutex_lock(&adev->notifier_lock); 	mmu_interval_set_seq(mni, cur_seq); 	r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_BOOKKEEP,				  false, MAX_SCHEDULE_TIMEOUT);	mutex_unlock(&adev->notifier_lock);	if (r <= 0)		DRM_ERROR("(%ld) failed to wait for user bo\n", r);	return true;} static const struct mmu_interval_notifier_ops amdgpu_mn_gfx_ops = {	.invalidate = amdgpu_mn_invalidate_gfx,}; /** * amdgpu_mn_invalidate_hsa - callback to notify about mm change * * @mni: the range (mm) is about to update * @range: details on the invalidation * @cur_seq: Value to pass to mmu_interval_set_seq() * * We temporarily evict the BO attached to this range. This necessitates * evicting all user-mode queues of the process. */static bool amdgpu_mn_invalidate_hsa(struct mmu_interval_notifier *mni,				     const struct mmu_notifier_range *range,				     unsigned long cur_seq){	struct amdgpu_bo *bo = container_of(mni, struct amdgpu_bo, notifier);	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev); 	if (!mmu_notifier_range_blockable(range))		return false; 	mutex_lock(&adev->notifier_lock); 	mmu_interval_set_seq(mni, cur_seq); 	amdgpu_amdkfd_evict_userptr(bo->kfd_bo, bo->notifier.mm);	mutex_unlock(&adev->notifier_lock); 	return true;} static const struct mmu_interval_notifier_ops amdgpu_mn_hsa_ops = {	.invalidate = amdgpu_mn_invalidate_hsa,}; /** * amdgpu_mn_register - register a BO for notifier updates * * @bo: amdgpu buffer object * @addr: userptr addr we should monitor * * Registers a mmu_notifier for the given BO at the specified address. * Returns 0 on success, -ERRNO if anything goes wrong. */int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr){	if (bo->kfd_bo)		return mmu_interval_notifier_insert(&bo->notifier, current->mm,						    addr, amdgpu_bo_size(bo),						    &amdgpu_mn_hsa_ops);	return mmu_interval_notifier_insert(&bo->notifier, current->mm, addr,					    amdgpu_bo_size(bo),					    &amdgpu_mn_gfx_ops);} /** * amdgpu_mn_unregister - unregister a BO for notifier updates * * @bo: amdgpu buffer object * * Remove any registration of mmu notifier updates from the buffer object. */void amdgpu_mn_unregister(struct amdgpu_bo *bo){	if (!bo->notifier.mm)		return;	mmu_interval_notifier_remove(&bo->notifier);	bo->notifier.mm = NULL;} int amdgpu_hmm_range_get_pages(struct mmu_interval_notifier *notifier,			       struct mm_struct *mm, struct page **pages,			       uint64_t start, uint64_t npages,			       struct hmm_range **phmm_range, bool readonly,			       bool mmap_locked, void *owner){	struct hmm_range *hmm_range;	unsigned long timeout;	unsigned long i;	unsigned long *pfns;	int r = 0; 	hmm_range = kzalloc(sizeof(*hmm_range), GFP_KERNEL);	if (unlikely(!hmm_range))		return -ENOMEM; 	pfns = kvmalloc_array(npages, sizeof(*pfns), GFP_KERNEL);	if (unlikely(!pfns)) {		r = -ENOMEM;		goto out_free_range;	} 	hmm_range->notifier = notifier;	hmm_range->default_flags = HMM_PFN_REQ_FAULT;	if (!readonly)		hmm_range->default_flags |= HMM_PFN_REQ_WRITE;	hmm_range->hmm_pfns = pfns;	hmm_range->start = start;	hmm_range->end = start + npages * PAGE_SIZE;	hmm_range->dev_private_owner = owner; 	/* Assuming 512MB takes maxmium 1 second to fault page address */	timeout = max(npages >> 17, 1ULL) * HMM_RANGE_DEFAULT_TIMEOUT;	timeout = jiffies + msecs_to_jiffies(timeout); retry:	hmm_range->notifier_seq = mmu_interval_read_begin(notifier); 	if (likely(!mmap_locked))		mmap_read_lock(mm); 	r = hmm_range_fault(hmm_range); 	if (likely(!mmap_locked))		mmap_read_unlock(mm);	if (unlikely(r)) {		/*		 * FIXME: This timeout should encompass the retry from		 * mmu_interval_read_retry() as well.		 */		if (r == -EBUSY && !time_after(jiffies, timeout))			goto retry;		goto out_free_pfns;	} 	/*	 * Due to default_flags, all pages are HMM_PFN_VALID or	 * hmm_range_fault() fails. FIXME: The pages cannot be touched outside	 * the notifier_lock, and mmu_interval_read_retry() must be done first.	 */	for (i = 0; pages && i < npages; i++)		pages[i] = hmm_pfn_to_page(pfns[i]); 	*phmm_range = hmm_range; 	return 0; out_free_pfns:	kvfree(pfns);out_free_range:	kfree(hmm_range); 	return r;} int amdgpu_hmm_range_get_pages_done(struct hmm_range *hmm_range){	int r; 	r = mmu_interval_read_retry(hmm_range->notifier,				    hmm_range->notifier_seq);	kvfree(hmm_range->hmm_pfns);	kfree(hmm_range); 	return r;}