[deliverable/linux.git] / drivers / gpu / drm / msm / msm_iommu.c

/*
 * Copyright (C) 2013 Red Hat
 * Author: Rob Clark <robdclark@gmail.com>
 *
 * 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 "msm_drv.h"
#include "msm_mmu.h"

struct msm_iommu {
	struct msm_mmu base;
	struct iommu_domain *domain;
};
#define to_msm_iommu(x) container_of(x, struct msm_iommu, base)

static int msm_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;
}

static int msm_iommu_attach(struct msm_mmu *mmu, const char **names, int cnt)
{
	struct drm_device *dev = mmu->dev;
	struct msm_iommu *iommu = to_msm_iommu(mmu);
	int i, ret;

	for (i = 0; i < cnt; i++) {
		struct device *msm_iommu_get_ctx(const char *ctx_name);
		struct device *ctx = msm_iommu_get_ctx(names[i]);
		if (IS_ERR_OR_NULL(ctx))
			continue;
		ret = iommu_attach_device(iommu->domain, ctx);
		if (ret) {
			dev_warn(dev->dev, "could not attach iommu to %s", names[i]);
			return ret;
		}
	}

	return 0;
}

static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova,
		struct sg_table *sgt, unsigned len, int prot)
{
	struct msm_iommu *iommu = to_msm_iommu(mmu);
	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_phys(sg) - sg->offset;
		size_t bytes = sg->length + sg->offset;

		VERB("map[%d]: %08x %08x(%x)", 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->length + sg->offset;
		iommu_unmap(domain, da, bytes);
		da += bytes;
	}
	return ret;
}

static int msm_iommu_unmap(struct msm_mmu *mmu, uint32_t iova,
		struct sg_table *sgt, unsigned len)
{
	struct msm_iommu *iommu = to_msm_iommu(mmu);
	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->length + sg->offset;
		size_t unmapped;

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

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

		BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));

		da += bytes;
	}

	return 0;
}

static void msm_iommu_destroy(struct msm_mmu *mmu)
{
	struct msm_iommu *iommu = to_msm_iommu(mmu);
	iommu_domain_free(iommu->domain);
	kfree(iommu);
}

static const struct msm_mmu_funcs funcs = {
		.attach = msm_iommu_attach,
		.map = msm_iommu_map,
		.unmap = msm_iommu_unmap,
		.destroy = msm_iommu_destroy,
};

struct msm_mmu *msm_iommu_new(struct drm_device *dev, struct iommu_domain *domain)
{
	struct msm_iommu *iommu;

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

	iommu->domain = domain;
	msm_mmu_init(&iommu->base, dev, &funcs);
	iommu_set_fault_handler(domain, msm_fault_handler, dev);

	return &iommu->base;
}
Commit	Line	Data
871d812a RC	1	/*
	2	* Copyright (C) 2013 Red Hat
	3	* Author: Rob Clark <robdclark@gmail.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 as published by
	7	* the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but WITHOUT
	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	12	* more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along with
	15	* this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#include "msm_drv.h"
	19	#include "msm_mmu.h"
	20
	21	struct msm_iommu {
	22	struct msm_mmu base;
	23	struct iommu_domain *domain;
	24	};
	25	#define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
	26
	27	static int msm_fault_handler(struct iommu_domain iommu, struct device dev,
	28	unsigned long iova, int flags, void *arg)
	29	{
	30	DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
	31	return 0;
	32	}
	33
	34	static int msm_iommu_attach(struct msm_mmu mmu, const char *names, int cnt)
	35	{
	36	struct drm_device *dev = mmu->dev;
	37	struct msm_iommu *iommu = to_msm_iommu(mmu);
	38	int i, ret;
	39
	40	for (i = 0; i < cnt; i++) {
	41	struct device msm_iommu_get_ctx(const char ctx_name);
	42	struct device *ctx = msm_iommu_get_ctx(names[i]);
55459968	43	if (IS_ERR_OR_NULL(ctx))
871d812a RC	44	continue;
	45	ret = iommu_attach_device(iommu->domain, ctx);
	46	if (ret) {
	47	dev_warn(dev->dev, "could not attach iommu to %s", names[i]);
	48	return ret;
	49	}
	50	}
	51
	52	return 0;
	53	}
	54
	55	static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova,
	56	struct sg_table *sgt, unsigned len, int prot)
	57	{
	58	struct msm_iommu *iommu = to_msm_iommu(mmu);
	59	struct iommu_domain *domain = iommu->domain;
	60	struct scatterlist *sg;
	61	unsigned int da = iova;
	62	unsigned int i, j;
	63	int ret;
	64
	65	if (!domain \|\| !sgt)
	66	return -EINVAL;
	67
	68	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	69	u32 pa = sg_phys(sg) - sg->offset;
	70	size_t bytes = sg->length + sg->offset;
	71
	72	VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes);
	73
	74	ret = iommu_map(domain, da, pa, bytes, prot);
	75	if (ret)
	76	goto fail;
	77
	78	da += bytes;
	79	}
	80
	81	return 0;
	82
	83	fail:
	84	da = iova;
	85
	86	for_each_sg(sgt->sgl, sg, i, j) {
	87	size_t bytes = sg->length + sg->offset;
	88	iommu_unmap(domain, da, bytes);
	89	da += bytes;
	90	}
	91	return ret;
	92	}
	93
	94	static int msm_iommu_unmap(struct msm_mmu *mmu, uint32_t iova,
	95	struct sg_table *sgt, unsigned len)
	96	{
	97	struct msm_iommu *iommu = to_msm_iommu(mmu);
	98	struct iommu_domain *domain = iommu->domain;
	99	struct scatterlist *sg;
	100	unsigned int da = iova;
	101	int i;
	102
	103	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	104	size_t bytes = sg->length + sg->offset;
	105	size_t unmapped;
	106
	107	unmapped = iommu_unmap(domain, da, bytes);
108	if (unmapped < bytes)
109	return unmapped;
110
111	VERB("unmap[%d]: %08x(%x)", i, iova, bytes);
112
113	BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
114
115	da += bytes;
116	}
117
118	return 0;
119	}
120
121	static void msm_iommu_destroy(struct msm_mmu *mmu)
122	{
123	struct msm_iommu *iommu = to_msm_iommu(mmu);
124	iommu_domain_free(iommu->domain);
125	kfree(iommu);
126	}
127
128	static const struct msm_mmu_funcs funcs = {
129	.attach = msm_iommu_attach,
130	.map = msm_iommu_map,
131	.unmap = msm_iommu_unmap,
132	.destroy = msm_iommu_destroy,
133	};
134
135	struct msm_mmu msm_iommu_new(struct drm_device dev, struct iommu_domain *domain)
136	{
137	struct msm_iommu *iommu;
138
139	iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
140	if (!iommu)
141	return ERR_PTR(-ENOMEM);
142
143	iommu->domain = domain;
144	msm_mmu_init(&iommu->base, dev, &funcs);
145	iommu_set_fault_handler(domain, msm_fault_handler, dev);
146
147	return &iommu->base;
148	}