/* * Copyright 2008 Jerome Glisse. * 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, sublicense, * 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 above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * 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 NONINFRINGEMENT.  IN NO EVENT SHALL * PRECISION INSIGHT 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. * * Authors: *    Jerome Glisse <glisse@freedesktop.org> */#include <linux/pagemap.h>#include <drm/drmP.h>#include <drm/amdgpu_drm.h>#include <drm/drm_syncobj.h>#include "amdgpu.h"#include "amdgpu_trace.h" static int amdgpu_cs_user_fence_chunk(struct amdgpu_cs_parser *p,				      struct drm_amdgpu_cs_chunk_fence *data,				      uint32_t *offset){	struct drm_gem_object *gobj;	unsigned long size; 	gobj = drm_gem_object_lookup(p->filp, data->handle);	if (gobj == NULL)		return -EINVAL; 	p->uf_entry.robj = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));	p->uf_entry.priority = 0;	p->uf_entry.tv.bo = &p->uf_entry.robj->tbo;	p->uf_entry.tv.shared = true;	p->uf_entry.user_pages = NULL; 	size = amdgpu_bo_size(p->uf_entry.robj);	if (size != PAGE_SIZE || (data->offset + 8) > size)		return -EINVAL; 	*offset = data->offset; 	drm_gem_object_unreference_unlocked(gobj); 	if (amdgpu_ttm_tt_get_usermm(p->uf_entry.robj->tbo.ttm)) {		amdgpu_bo_unref(&p->uf_entry.robj);		return -EINVAL;	} 	return 0;} static int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data){	struct amdgpu_fpriv *fpriv = p->filp->driver_priv;	struct amdgpu_vm *vm = &fpriv->vm;	union drm_amdgpu_cs *cs = data;	uint64_t *chunk_array_user;	uint64_t *chunk_array;	unsigned size, num_ibs = 0;	uint32_t uf_offset = 0;	int i;	int ret; 	if (cs->in.num_chunks == 0)		return 0; 	chunk_array = kmalloc_array(cs->in.num_chunks, sizeof(uint64_t), GFP_KERNEL);	if (!chunk_array)		return -ENOMEM; 	p->ctx = amdgpu_ctx_get(fpriv, cs->in.ctx_id);	if (!p->ctx) {		ret = -EINVAL;		goto free_chunk;	} 	/* get chunks */	chunk_array_user = (uint64_t __user *)(uintptr_t)(cs->in.chunks);	if (copy_from_user(chunk_array, chunk_array_user,			   sizeof(uint64_t)*cs->in.num_chunks)) {		ret = -EFAULT;		goto put_ctx;	} 	p->nchunks = cs->in.num_chunks;	p->chunks = kmalloc_array(p->nchunks, sizeof(struct amdgpu_cs_chunk),			    GFP_KERNEL);	if (!p->chunks) {		ret = -ENOMEM;		goto put_ctx;	} 	for (i = 0; i < p->nchunks; i++) {		struct drm_amdgpu_cs_chunk __user **chunk_ptr = NULL;		struct drm_amdgpu_cs_chunk user_chunk;		uint32_t __user *cdata; 		chunk_ptr = (void __user *)(uintptr_t)chunk_array[i];		if (copy_from_user(&user_chunk, chunk_ptr,				       sizeof(struct drm_amdgpu_cs_chunk))) {			ret = -EFAULT;			i--;			goto free_partial_kdata;		}		p->chunks[i].chunk_id = user_chunk.chunk_id;		p->chunks[i].length_dw = user_chunk.length_dw; 		size = p->chunks[i].length_dw;		cdata = (void __user *)(uintptr_t)user_chunk.chunk_data; 		p->chunks[i].kdata = kvmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);		if (p->chunks[i].kdata == NULL) {			ret = -ENOMEM;			i--;			goto free_partial_kdata;		}		size *= sizeof(uint32_t);		if (copy_from_user(p->chunks[i].kdata, cdata, size)) {			ret = -EFAULT;			goto free_partial_kdata;		} 		switch (p->chunks[i].chunk_id) {		case AMDGPU_CHUNK_ID_IB:			++num_ibs;			break; 		case AMDGPU_CHUNK_ID_FENCE:			size = sizeof(struct drm_amdgpu_cs_chunk_fence);			if (p->chunks[i].length_dw * sizeof(uint32_t) < size) {				ret = -EINVAL;				goto free_partial_kdata;			} 			ret = amdgpu_cs_user_fence_chunk(p, p->chunks[i].kdata,							 &uf_offset);			if (ret)				goto free_partial_kdata; 			break; 		case AMDGPU_CHUNK_ID_DEPENDENCIES:		case AMDGPU_CHUNK_ID_SYNCOBJ_IN:		case AMDGPU_CHUNK_ID_SYNCOBJ_OUT:			break; 		default:			ret = -EINVAL;			goto free_partial_kdata;		}	} 	ret = amdgpu_job_alloc(p->adev, num_ibs, &p->job, vm);	if (ret)		goto free_all_kdata; 	if (p->uf_entry.robj)		p->job->uf_addr = uf_offset;	kfree(chunk_array);	return 0; free_all_kdata:	i = p->nchunks - 1;free_partial_kdata:	for (; i >= 0; i--)		kvfree(p->chunks[i].kdata);	kfree(p->chunks);	p->chunks = NULL;	p->nchunks = 0;put_ctx:	amdgpu_ctx_put(p->ctx);free_chunk:	kfree(chunk_array); 	return ret;} /* Convert microseconds to bytes. */static u64 us_to_bytes(struct amdgpu_device *adev, s64 us){	if (us <= 0 || !adev->mm_stats.log2_max_MBps)		return 0; 	/* Since accum_us is incremented by a million per second, just	 * multiply it by the number of MB/s to get the number of bytes.	 */	return us << adev->mm_stats.log2_max_MBps;} static s64 bytes_to_us(struct amdgpu_device *adev, u64 bytes){	if (!adev->mm_stats.log2_max_MBps)		return 0; 	return bytes >> adev->mm_stats.log2_max_MBps;} /* Returns how many bytes TTM can move right now. If no bytes can be moved, * it returns 0. If it returns non-zero, it's OK to move at least one buffer, * which means it can go over the threshold once. If that happens, the driver * will be in debt and no other buffer migrations can be done until that debt * is repaid. * * This approach allows moving a buffer of any size (it's important to allow * that). * * The currency is simply time in microseconds and it increases as the clock * ticks. The accumulated microseconds (us) are converted to bytes and * returned. */static u64 amdgpu_cs_get_threshold_for_moves(struct amdgpu_device *adev){	s64 time_us, increment_us;	u64 max_bytes;	u64 free_vram, total_vram, used_vram; 	/* Allow a maximum of 200 accumulated ms. This is basically per-IB	 * throttling.	 *	 * It means that in order to get full max MBps, at least 5 IBs per	 * second must be submitted and not more than 200ms apart from each	 * other.	 */	const s64 us_upper_bound = 200000; 	if (!adev->mm_stats.log2_max_MBps)		return 0; 	total_vram = adev->mc.real_vram_size - adev->vram_pin_size;	used_vram = atomic64_read(&adev->vram_usage);	free_vram = used_vram >= total_vram ? 0 : total_vram - used_vram; 	spin_lock(&adev->mm_stats.lock); 	/* Increase the amount of accumulated us. */	time_us = ktime_to_us(ktime_get());	increment_us = time_us - adev->mm_stats.last_update_us;	adev->mm_stats.last_update_us = time_us;	adev->mm_stats.accum_us = min(adev->mm_stats.accum_us + increment_us,                                      us_upper_bound); 	/* This prevents the short period of low performance when the VRAM	 * usage is low and the driver is in debt or doesn't have enough	 * accumulated us to fill VRAM quickly.	 *	 * The situation can occur in these cases:	 * - a lot of VRAM is freed by userspace	 * - the presence of a big buffer causes a lot of evictions	 *   (solution: split buffers into smaller ones)	 *	 * If 128 MB or 1/8th of VRAM is free, start filling it now by setting	 * accum_us to a positive number.	 */	if (free_vram >= 128 * 1024 * 1024 || free_vram >= total_vram / 8) {		s64 min_us; 		/* Be more aggresive on dGPUs. Try to fill a portion of free		 * VRAM now.		 */		if (!(adev->flags & AMD_IS_APU))			min_us = bytes_to_us(adev, free_vram / 4);		else			min_us = 0; /* Reset accum_us on APUs. */ 		adev->mm_stats.accum_us = max(min_us, adev->mm_stats.accum_us);	} 	/* This returns 0 if the driver is in debt to disallow (optional)	 * buffer moves.	 */	max_bytes = us_to_bytes(adev, adev->mm_stats.accum_us); 	spin_unlock(&adev->mm_stats.lock);	return max_bytes;} /* Report how many bytes have really been moved for the last command * submission. This can result in a debt that can stop buffer migrations * temporarily. */void amdgpu_cs_report_moved_bytes(struct amdgpu_device *adev, u64 num_bytes){	spin_lock(&adev->mm_stats.lock);	adev->mm_stats.accum_us -= bytes_to_us(adev, num_bytes);	spin_unlock(&adev->mm_stats.lock);} static int amdgpu_cs_bo_validate(struct amdgpu_cs_parser *p,				 struct amdgpu_bo *bo){	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);	u64 initial_bytes_moved;	uint32_t domain;	int r; 	if (bo->pin_count)		return 0; 	/* Don't move this buffer if we have depleted our allowance	 * to move it. Don't move anything if the threshold is zero.	 */	if (p->bytes_moved < p->bytes_moved_threshold)		domain = bo->prefered_domains;	else		domain = bo->allowed_domains; retry:	amdgpu_ttm_placement_from_domain(bo, domain);	initial_bytes_moved = atomic64_read(&adev->num_bytes_moved);	r = ttm_bo_validate(&bo->tbo, &bo->placement, true, false);	p->bytes_moved += atomic64_read(&adev->num_bytes_moved) -		initial_bytes_moved; 	if (unlikely(r == -ENOMEM) && domain != bo->allowed_domains) {		domain = bo->allowed_domains;		goto retry;	} 	return r;} /* Last resort, try to evict something from the current working set */static bool amdgpu_cs_try_evict(struct amdgpu_cs_parser *p,				struct amdgpu_bo *validated){	uint32_t domain = validated->allowed_domains;	int r; 	if (!p->evictable)		return false; 	for (;&p->evictable->tv.head != &p->validated;	     p->evictable = list_prev_entry(p->evictable, tv.head)) { 		struct amdgpu_bo_list_entry *candidate = p->evictable;		struct amdgpu_bo *bo = candidate->robj;		struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);		u64 initial_bytes_moved;		uint32_t other; 		/* If we reached our current BO we can forget it */		if (candidate->robj == validated)			break; 		other = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type); 		/* Check if this BO is in one of the domains we need space for */		if (!(other & domain))			continue; 		/* Check if we can move this BO somewhere else */		other = bo->allowed_domains & ~domain;		if (!other)			continue; 		/* Good we can try to move this BO somewhere else */		amdgpu_ttm_placement_from_domain(bo, other);		initial_bytes_moved = atomic64_read(&adev->num_bytes_moved);		r = ttm_bo_validate(&bo->tbo, &bo->placement, true, false);		p->bytes_moved += atomic64_read(&adev->num_bytes_moved) -			initial_bytes_moved; 		if (unlikely(r))			break; 		p->evictable = list_prev_entry(p->evictable, tv.head);		list_move(&candidate->tv.head, &p->validated); 		return true;	} 	return false;} static int amdgpu_cs_validate(void *param, struct amdgpu_bo *bo){	struct amdgpu_cs_parser *p = param;	int r; 	do {		r = amdgpu_cs_bo_validate(p, bo);	} while (r == -ENOMEM && amdgpu_cs_try_evict(p, bo));	if (r)		return r; 	if (bo->shadow)		r = amdgpu_cs_bo_validate(p, bo->shadow); 	return r;} static int amdgpu_cs_list_validate(struct amdgpu_cs_parser *p,			    struct list_head *validated){	struct amdgpu_bo_list_entry *lobj;	int r; 	list_for_each_entry(lobj, validated, tv.head) {		struct amdgpu_bo *bo = lobj->robj;		bool binding_userptr = false;		struct mm_struct *usermm; 		usermm = amdgpu_ttm_tt_get_usermm(bo->tbo.ttm);		if (usermm && usermm != current->mm)			return -EPERM; 		/* Check if we have user pages and nobody bound the BO already */		if (lobj->user_pages && bo->tbo.ttm->state != tt_bound) {			size_t size = sizeof(struct page *); 			size *= bo->tbo.ttm->num_pages;			memcpy(bo->tbo.ttm->pages, lobj->user_pages, size);			binding_userptr = true;		} 		if (p->evictable == lobj)			p->evictable = NULL; 		r = amdgpu_cs_validate(p, bo);		if (r)			return r; 		if (binding_userptr) {			kvfree(lobj->user_pages);			lobj->user_pages = NULL;		}	}	return 0;} static int amdgpu_cs_parser_bos(struct amdgpu_cs_parser *p,				union drm_amdgpu_cs *cs){	struct amdgpu_fpriv *fpriv = p->filp->driver_priv;	struct amdgpu_bo_list_entry *e;	struct list_head duplicates;	bool need_mmap_lock = false;	unsigned i, tries = 10;	int r; 	INIT_LIST_HEAD(&p->validated); 	p->bo_list = amdgpu_bo_list_get(fpriv, cs->in.bo_list_handle);	if (p->bo_list) {		need_mmap_lock = p->bo_list->first_userptr !=			p->bo_list->num_entries;		amdgpu_bo_list_get_list(p->bo_list, &p->validated);	} 	INIT_LIST_HEAD(&duplicates);	amdgpu_vm_get_pd_bo(&fpriv->vm, &p->validated, &p->vm_pd); 	if (p->uf_entry.robj)		list_add(&p->uf_entry.tv.head, &p->validated); 	if (need_mmap_lock)		down_read(&current->mm->mmap_sem); 	while (1) {		struct list_head need_pages;		unsigned i; 		r = ttm_eu_reserve_buffers(&p->ticket, &p->validated, true,					   &duplicates);		if (unlikely(r != 0)) {			if (r != -ERESTARTSYS)				DRM_ERROR("ttm_eu_reserve_buffers failed.\n");			goto error_free_pages;		} 		/* Without a BO list we don't have userptr BOs */		if (!p->bo_list)			break; 		INIT_LIST_HEAD(&need_pages);		for (i = p->bo_list->first_userptr;		     i < p->bo_list->num_entries; ++i) { 			e = &p->bo_list->array[i]; 			if (amdgpu_ttm_tt_userptr_invalidated(e->robj->tbo.ttm,				 &e->user_invalidated) && e->user_pages) { 				/* We acquired a page array, but somebody				 * invalidated it. Free it and try again

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