[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)
{
	pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", iova, flags);
	return 0;
}

static int msm_iommu_attach(struct msm_mmu *mmu, const char * const *names,
			    int cnt)
{
	struct msm_iommu *iommu = to_msm_iommu(mmu);
	return iommu_attach_device(iommu->domain, mmu->dev);
}

static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names,
			     int cnt)
{
	struct msm_iommu *iommu = to_msm_iommu(mmu);
	iommu_detach_device(iommu->domain, mmu->dev);
}

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) {
		dma_addr_t pa = sg_phys(sg) - sg->offset;
		size_t bytes = sg->length + sg->offset;

		VERB("map[%d]: %08x %08lx(%zx)", i, da, (unsigned long)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(%zx)", i, da, bytes);

		BUG_ON(!PAGE_ALIGNED(bytes));

		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,
		.detach = msm_iommu_detach,
		.map = msm_iommu_map,
		.unmap = msm_iommu_unmap,
		.destroy = msm_iommu_destroy,
};

struct msm_mmu *msm_iommu_new(struct 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	{
6814dbf9 RC	30	pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", iova, flags);
6814dbf9 RC	31	return 0;
871d812a RC	32	}
871d812a RC	33
d72ab599 RC	34	static int msm_iommu_attach(struct msm_mmu mmu, const char const *names,
d72ab599 RC	35	int cnt)
871d812a	36	{
871d812a	37	struct msm_iommu *iommu = to_msm_iommu(mmu);
944fc36c	38	return iommu_attach_device(iommu->domain, mmu->dev);
871d812a RC	39	}
871d812a RC	40
d72ab599 RC	41	static void msm_iommu_detach(struct msm_mmu mmu, const char const *names,
d72ab599 RC	42	int cnt)
87e956e9 SV	43	{
87e956e9 SV	44	struct msm_iommu *iommu = to_msm_iommu(mmu);
944fc36c	45	iommu_detach_device(iommu->domain, mmu->dev);
87e956e9 SV	46	}
87e956e9 SV	47
871d812a RC	48	static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova,
	49	struct sg_table *sgt, unsigned len, int prot)
	50	{
	51	struct msm_iommu *iommu = to_msm_iommu(mmu);
	52	struct iommu_domain *domain = iommu->domain;
	53	struct scatterlist *sg;
	54	unsigned int da = iova;
	55	unsigned int i, j;
	56	int ret;
	57
	58	if (!domain \|\| !sgt)
	59	return -EINVAL;
	60
	61	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
69be1f4e	62	dma_addr_t pa = sg_phys(sg) - sg->offset;
871d812a RC	63	size_t bytes = sg->length + sg->offset;
871d812a RC	64
cbe4295a	65	VERB("map[%d]: %08x %08lx(%zx)", i, da, (unsigned long)pa, bytes);
871d812a RC	66
	67	ret = iommu_map(domain, da, pa, bytes, prot);
	68	if (ret)
	69	goto fail;
	70
	71	da += bytes;
	72	}
	73
	74	return 0;
	75
	76	fail:
	77	da = iova;
	78
	79	for_each_sg(sgt->sgl, sg, i, j) {
	80	size_t bytes = sg->length + sg->offset;
	81	iommu_unmap(domain, da, bytes);
	82	da += bytes;
	83	}
	84	return ret;
	85	}
	86
	87	static int msm_iommu_unmap(struct msm_mmu *mmu, uint32_t iova,
	88	struct sg_table *sgt, unsigned len)
	89	{
	90	struct msm_iommu *iommu = to_msm_iommu(mmu);
	91	struct iommu_domain *domain = iommu->domain;
	92	struct scatterlist *sg;
	93	unsigned int da = iova;
	94	int i;
	95
	96	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	97	size_t bytes = sg->length + sg->offset;
	98	size_t unmapped;
	99
	100	unmapped = iommu_unmap(domain, da, bytes);
	101	if (unmapped < bytes)
	102	return unmapped;
	103
cbe4295a	104	VERB("unmap[%d]: %08x(%zx)", i, da, bytes);
871d812a	105
cf3198c2	106	BUG_ON(!PAGE_ALIGNED(bytes));
871d812a RC	107
	108	da += bytes;
	109	}
	110
	111	return 0;
	112	}
	113
	114	static void msm_iommu_destroy(struct msm_mmu *mmu)
	115	{
	116	struct msm_iommu *iommu = to_msm_iommu(mmu);
	117	iommu_domain_free(iommu->domain);
	118	kfree(iommu);
	119	}
	120
	121	static const struct msm_mmu_funcs funcs = {
	122	.attach = msm_iommu_attach,
87e956e9	123	.detach = msm_iommu_detach,
871d812a RC	124	.map = msm_iommu_map,
	125	.unmap = msm_iommu_unmap,
	126	.destroy = msm_iommu_destroy,
	127	};
	128
944fc36c	129	struct msm_mmu msm_iommu_new(struct device dev, struct iommu_domain *domain)
871d812a RC	130	{
	131	struct msm_iommu *iommu;
	132
	133	iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
	134	if (!iommu)
	135	return ERR_PTR(-ENOMEM);
	136
	137	iommu->domain = domain;
	138	msm_mmu_init(&iommu->base, dev, &funcs);
	139	iommu_set_fault_handler(domain, msm_fault_handler, dev);
	140
	141	return &iommu->base;
	142	}