[linux-2.6-block.git] / drivers / gpu / drm / etnaviv / etnaviv_mmu.c

/*
 * Copyright (C) 2015 Etnaviv Project
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_mmu.h"

static int etnaviv_fault_handler(struct iommu_domain *iommu, struct device *dev,
		unsigned long iova, int flags, void *arg)
{
	DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
	return 0;
}

int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
		struct sg_table *sgt, unsigned len, int prot)
{
	struct iommu_domain *domain = iommu->domain;
	struct scatterlist *sg;
	unsigned int da = iova;
	unsigned int i, j;
	int ret;

	if (!domain || !sgt)
		return -EINVAL;

	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
		u32 pa = sg_dma_address(sg) - sg->offset;
		size_t bytes = sg_dma_len(sg) + sg->offset;

		VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);

		ret = iommu_map(domain, da, pa, bytes, prot);
		if (ret)
			goto fail;

		da += bytes;
	}

	return 0;

fail:
	da = iova;

	for_each_sg(sgt->sgl, sg, i, j) {
		size_t bytes = sg_dma_len(sg) + sg->offset;

		iommu_unmap(domain, da, bytes);
		da += bytes;
	}
	return ret;
}

int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
		struct sg_table *sgt, unsigned len)
{
	struct iommu_domain *domain = iommu->domain;
	struct scatterlist *sg;
	unsigned int da = iova;
	int i;

	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
		size_t bytes = sg_dma_len(sg) + sg->offset;
		size_t unmapped;

		unmapped = iommu_unmap(domain, da, bytes);
		if (unmapped < bytes)
			return unmapped;

		VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);

		BUG_ON(!PAGE_ALIGNED(bytes));

		da += bytes;
	}

	return 0;
}

static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
	struct etnaviv_vram_mapping *mapping)
{
	struct etnaviv_gem_object *etnaviv_obj = mapping->object;

	etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
			    etnaviv_obj->sgt, etnaviv_obj->base.size);
	drm_mm_remove_node(&mapping->vram_node);
}

int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
	struct etnaviv_vram_mapping *mapping)
{
	struct etnaviv_vram_mapping *free = NULL;
	struct sg_table *sgt = etnaviv_obj->sgt;
	struct drm_mm_node *node;
	int ret;

	lockdep_assert_held(&etnaviv_obj->lock);

	mutex_lock(&mmu->lock);

	/* v1 MMU can optimize single entry (contiguous) scatterlists */
	if (sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
		u32 iova;

		iova = sg_dma_address(sgt->sgl) - memory_base;
		if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
			mapping->iova = iova;
			list_add_tail(&mapping->mmu_node, &mmu->mappings);
			mutex_unlock(&mmu->lock);
			return 0;
		}
	}

	node = &mapping->vram_node;
	while (1) {
		struct etnaviv_vram_mapping *m, *n;
		struct list_head list;
		bool found;

		ret = drm_mm_insert_node_in_range(&mmu->mm, node,
			etnaviv_obj->base.size, 0, mmu->last_iova, ~0UL,
			DRM_MM_SEARCH_DEFAULT);

		if (ret != -ENOSPC)
			break;

		/*
		 * If we did not search from the start of the MMU region,
		 * try again in case there are free slots.
		 */
		if (mmu->last_iova) {
			mmu->last_iova = 0;
			mmu->need_flush = true;
			continue;
		}

		/* Try to retire some entries */
		drm_mm_init_scan(&mmu->mm, etnaviv_obj->base.size, 0, 0);

		found = 0;
		INIT_LIST_HEAD(&list);
		list_for_each_entry(free, &mmu->mappings, mmu_node) {
			/* If this vram node has not been used, skip this. */
			if (!free->vram_node.mm)
				continue;

			/*
			 * If the iova is pinned, then it's in-use,
			 * so we must keep its mapping.
			 */
			if (free->use)
				continue;

			list_add(&free->scan_node, &list);
			if (drm_mm_scan_add_block(&free->vram_node)) {
				found = true;
				break;
			}
		}

		if (!found) {
			/* Nothing found, clean up and fail */
			list_for_each_entry_safe(m, n, &list, scan_node)
				BUG_ON(drm_mm_scan_remove_block(&m->vram_node));
			break;
		}

		/*
		 * drm_mm does not allow any other operations while
		 * scanning, so we have to remove all blocks first.
		 * If drm_mm_scan_remove_block() returns false, we
		 * can leave the block pinned.
		 */
		list_for_each_entry_safe(m, n, &list, scan_node)
			if (!drm_mm_scan_remove_block(&m->vram_node))
				list_del_init(&m->scan_node);

		/*
		 * Unmap the blocks which need to be reaped from the MMU.
		 * Clear the mmu pointer to prevent the get_iova finding
		 * this mapping.
		 */
		list_for_each_entry_safe(m, n, &list, scan_node) {
			etnaviv_iommu_remove_mapping(mmu, m);
			m->mmu = NULL;
			list_del_init(&m->mmu_node);
			list_del_init(&m->scan_node);
		}

		/*
		 * We removed enough mappings so that the new allocation will
		 * succeed.  Ensure that the MMU will be flushed before the
		 * associated commit requesting this mapping, and retry the
		 * allocation one more time.
		 */
		mmu->need_flush = true;
	}

	if (ret < 0) {
		mutex_unlock(&mmu->lock);
		return ret;
	}

	mmu->last_iova = node->start + etnaviv_obj->base.size;
	mapping->iova = node->start;
	ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
				IOMMU_READ | IOMMU_WRITE);

	if (ret < 0) {
		drm_mm_remove_node(node);
		mutex_unlock(&mmu->lock);
		return ret;
	}

	list_add_tail(&mapping->mmu_node, &mmu->mappings);
	mutex_unlock(&mmu->lock);

	return ret;
}

void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
	struct etnaviv_vram_mapping *mapping)
{
	WARN_ON(mapping->use);

	mutex_lock(&mmu->lock);

	/* If the vram node is on the mm, unmap and remove the node */
	if (mapping->vram_node.mm == &mmu->mm)
		etnaviv_iommu_remove_mapping(mmu, mapping);

	list_del(&mapping->mmu_node);
	mutex_unlock(&mmu->lock);
}

void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
{
	drm_mm_takedown(&mmu->mm);
	iommu_domain_free(mmu->domain);
	kfree(mmu);
}

struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu,
	struct iommu_domain *domain, enum etnaviv_iommu_version version)
{
	struct etnaviv_iommu *mmu;

	mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
	if (!mmu)
		return ERR_PTR(-ENOMEM);

	mmu->domain = domain;
	mmu->gpu = gpu;
	mmu->version = version;
	mutex_init(&mmu->lock);
	INIT_LIST_HEAD(&mmu->mappings);

	drm_mm_init(&mmu->mm, domain->geometry.aperture_start,
		    domain->geometry.aperture_end -
		      domain->geometry.aperture_start + 1);

	iommu_set_fault_handler(domain, etnaviv_fault_handler, gpu->dev);

	return mmu;
}

size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
{
	struct etnaviv_iommu_ops *ops;

	ops = container_of(iommu->domain->ops, struct etnaviv_iommu_ops, ops);

	return ops->dump_size(iommu->domain);
}

void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
{
	struct etnaviv_iommu_ops *ops;

	ops = container_of(iommu->domain->ops, struct etnaviv_iommu_ops, ops);

	ops->dump(iommu->domain, buf);
}
Commit	Line	Data
a8c21a54 T	1	/*
	2	* Copyright (C) 2015 Etnaviv Project
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License version 2 as published by
	6	* the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program. If not, see <http://www.gnu.org/licenses/>.
	15	*/
	16
	17	#include "etnaviv_drv.h"
	18	#include "etnaviv_gem.h"
	19	#include "etnaviv_gpu.h"
	20	#include "etnaviv_mmu.h"
	21
	22	static int etnaviv_fault_handler(struct iommu_domain iommu, struct device dev,
	23	unsigned long iova, int flags, void *arg)
	24	{
	25	DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
	26	return 0;
	27	}
	28
	29	int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
	30	struct sg_table *sgt, unsigned len, int prot)
	31	{
	32	struct iommu_domain *domain = iommu->domain;
	33	struct scatterlist *sg;
	34	unsigned int da = iova;
	35	unsigned int i, j;
	36	int ret;
	37
	38	if (!domain \|\| !sgt)
	39	return -EINVAL;
	40
	41	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	42	u32 pa = sg_dma_address(sg) - sg->offset;
	43	size_t bytes = sg_dma_len(sg) + sg->offset;
	44
	45	VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
	46
	47	ret = iommu_map(domain, da, pa, bytes, prot);
	48	if (ret)
	49	goto fail;
	50
	51	da += bytes;
	52	}
	53
	54	return 0;
	55
	56	fail:
	57	da = iova;
	58
	59	for_each_sg(sgt->sgl, sg, i, j) {
	60	size_t bytes = sg_dma_len(sg) + sg->offset;
	61
	62	iommu_unmap(domain, da, bytes);
	63	da += bytes;
	64	}
65	return ret;
66	}
67
68	int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
69	struct sg_table *sgt, unsigned len)
70	{
71	struct iommu_domain *domain = iommu->domain;
72	struct scatterlist *sg;
73	unsigned int da = iova;
74	int i;
75
76	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
77	size_t bytes = sg_dma_len(sg) + sg->offset;
78	size_t unmapped;
79
80	unmapped = iommu_unmap(domain, da, bytes);
81	if (unmapped < bytes)
82	return unmapped;
83
84	VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
85
86	BUG_ON(!PAGE_ALIGNED(bytes));
87
88	da += bytes;
89	}
90
91	return 0;
92	}
93
94	static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
95	struct etnaviv_vram_mapping *mapping)
96	{
97	struct etnaviv_gem_object *etnaviv_obj = mapping->object;
98
99	etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
100	etnaviv_obj->sgt, etnaviv_obj->base.size);
101	drm_mm_remove_node(&mapping->vram_node);
102	}
103
104	int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
105	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
106	struct etnaviv_vram_mapping *mapping)
107	{
108	struct etnaviv_vram_mapping *free = NULL;
109	struct sg_table *sgt = etnaviv_obj->sgt;
110	struct drm_mm_node *node;
111	int ret;
112
113	lockdep_assert_held(&etnaviv_obj->lock);
114
115	mutex_lock(&mmu->lock);
116
117	/* v1 MMU can optimize single entry (contiguous) scatterlists */
118	if (sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
119	u32 iova;
120
121	iova = sg_dma_address(sgt->sgl) - memory_base;
122	if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
123	mapping->iova = iova;
124	list_add_tail(&mapping->mmu_node, &mmu->mappings);
125	mutex_unlock(&mmu->lock);
126	return 0;
127	}
128	}
129
130	node = &mapping->vram_node;
131	while (1) {
132	struct etnaviv_vram_mapping m, n;
133	struct list_head list;
134	bool found;
135
136	ret = drm_mm_insert_node_in_range(&mmu->mm, node,
137	etnaviv_obj->base.size, 0, mmu->last_iova, ~0UL,
138	DRM_MM_SEARCH_DEFAULT);
139
140	if (ret != -ENOSPC)
141	break;
142
143	/*
144	* If we did not search from the start of the MMU region,
145	* try again in case there are free slots.
146	*/
147	if (mmu->last_iova) {
148	mmu->last_iova = 0;
149	mmu->need_flush = true;
150	continue;
151	}
152
153	/* Try to retire some entries */
154	drm_mm_init_scan(&mmu->mm, etnaviv_obj->base.size, 0, 0);
155
156	found = 0;
157	INIT_LIST_HEAD(&list);
158	list_for_each_entry(free, &mmu->mappings, mmu_node) {
159	/* If this vram node has not been used, skip this. */
160	if (!free->vram_node.mm)
161	continue;
162
163	/*
164	* If the iova is pinned, then it's in-use,
165	* so we must keep its mapping.
166	*/
167	if (free->use)
168	continue;
169
170	list_add(&free->scan_node, &list);
171	if (drm_mm_scan_add_block(&free->vram_node)) {
172	found = true;
173	break;
174	}
175	}
176
177	if (!found) {
178	/* Nothing found, clean up and fail */
179	list_for_each_entry_safe(m, n, &list, scan_node)
180	BUG_ON(drm_mm_scan_remove_block(&m->vram_node));
181	break;
182	}
183
184	/*
185	* drm_mm does not allow any other operations while
186	* scanning, so we have to remove all blocks first.
187	* If drm_mm_scan_remove_block() returns false, we
188	* can leave the block pinned.
189	*/
190	list_for_each_entry_safe(m, n, &list, scan_node)
191	if (!drm_mm_scan_remove_block(&m->vram_node))
192	list_del_init(&m->scan_node);
193
194	/*
195	* Unmap the blocks which need to be reaped from the MMU.
196	* Clear the mmu pointer to prevent the get_iova finding
197	* this mapping.
198	*/
199	list_for_each_entry_safe(m, n, &list, scan_node) {
200	etnaviv_iommu_remove_mapping(mmu, m);
201	m->mmu = NULL;
202	list_del_init(&m->mmu_node);
203	list_del_init(&m->scan_node);
204	}
205
206	/*
207	* We removed enough mappings so that the new allocation will
208	* succeed. Ensure that the MMU will be flushed before the
209	* associated commit requesting this mapping, and retry the
210	* allocation one more time.
211	*/
212	mmu->need_flush = true;
213	}
214
215	if (ret < 0) {
216	mutex_unlock(&mmu->lock);
217	return ret;
218	}
219
220	mmu->last_iova = node->start + etnaviv_obj->base.size;
221	mapping->iova = node->start;
222	ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
223	IOMMU_READ \| IOMMU_WRITE);
224
225	if (ret < 0) {
226	drm_mm_remove_node(node);
227	mutex_unlock(&mmu->lock);
228	return ret;
229	}
230
231	list_add_tail(&mapping->mmu_node, &mmu->mappings);
232	mutex_unlock(&mmu->lock);
233
234	return ret;
235	}
236
237	void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
238	struct etnaviv_vram_mapping *mapping)
239	{
240	WARN_ON(mapping->use);
241
242	mutex_lock(&mmu->lock);
243
244	/* If the vram node is on the mm, unmap and remove the node */
245	if (mapping->vram_node.mm == &mmu->mm)
246	etnaviv_iommu_remove_mapping(mmu, mapping);
247
248	list_del(&mapping->mmu_node);
249	mutex_unlock(&mmu->lock);
250	}
251
252	void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
253	{
254	drm_mm_takedown(&mmu->mm);
255	iommu_domain_free(mmu->domain);
256	kfree(mmu);
257	}
258
259	struct etnaviv_iommu etnaviv_iommu_new(struct etnaviv_gpu gpu,
260	struct iommu_domain *domain, enum etnaviv_iommu_version version)
261	{
262	struct etnaviv_iommu *mmu;
263
264	mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
265	if (!mmu)
266	return ERR_PTR(-ENOMEM);
267
268	mmu->domain = domain;
269	mmu->gpu = gpu;
270	mmu->version = version;
271	mutex_init(&mmu->lock);
272	INIT_LIST_HEAD(&mmu->mappings);
273
274	drm_mm_init(&mmu->mm, domain->geometry.aperture_start,
275	domain->geometry.aperture_end -
276	domain->geometry.aperture_start + 1);
277
278	iommu_set_fault_handler(domain, etnaviv_fault_handler, gpu->dev);
279
280	return mmu;
281	}
282
283	size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
284	{
285	struct etnaviv_iommu_ops *ops;
286
287	ops = container_of(iommu->domain->ops, struct etnaviv_iommu_ops, ops);
288
289	return ops->dump_size(iommu->domain);
290	}
291
292	void etnaviv_iommu_dump(struct etnaviv_iommu iommu, void buf)
293	{
294	struct etnaviv_iommu_ops *ops;
295
296	ops = container_of(iommu->domain->ops, struct etnaviv_iommu_ops, ops);
297
298	ops->dump(iommu->domain, buf);
299	}