tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
21struct 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
27static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
28 unsigned long iova, int flags, void *arg)
29{
30 struct msm_iommu *iommu = arg;
31 if (iommu->base.handler)
32 return iommu->base.handler(iommu->base.arg, iova, flags);
33 pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", iova, flags);
34 return 0;
35}
36
37static int msm_iommu_attach(struct msm_mmu *mmu, const char * const *names,
38 int cnt)
39{
40 struct msm_iommu *iommu = to_msm_iommu(mmu);
41 int ret;
42
43 pm_runtime_get_sync(mmu->dev);
44 ret = iommu_attach_device(iommu->domain, mmu->dev);
45 pm_runtime_put_sync(mmu->dev);
46
47 return ret;
48}
49
50static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names,
51 int cnt)
52{
53 struct msm_iommu *iommu = to_msm_iommu(mmu);
54
55 pm_runtime_get_sync(mmu->dev);
56 iommu_detach_device(iommu->domain, mmu->dev);
57 pm_runtime_put_sync(mmu->dev);
58}
59
60static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
61 struct sg_table *sgt, unsigned len, int prot)
62{
63 struct msm_iommu *iommu = to_msm_iommu(mmu);
64 size_t ret;
65
66// pm_runtime_get_sync(mmu->dev);
67 ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
68// pm_runtime_put_sync(mmu->dev);
69 WARN_ON(ret < 0);
70
71 return (ret == len) ? 0 : -EINVAL;
72}
73
74static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova,
75 struct sg_table *sgt, unsigned len)
76{
77 struct msm_iommu *iommu = to_msm_iommu(mmu);
78
79 pm_runtime_get_sync(mmu->dev);
80 iommu_unmap(iommu->domain, iova, len);
81 pm_runtime_put_sync(mmu->dev);
82
83 return 0;
84}
85
86static void msm_iommu_destroy(struct msm_mmu *mmu)
87{
88 struct msm_iommu *iommu = to_msm_iommu(mmu);
89 iommu_domain_free(iommu->domain);
90 kfree(iommu);
91}
92
93static const struct msm_mmu_funcs funcs = {
94 .attach = msm_iommu_attach,
95 .detach = msm_iommu_detach,
96 .map = msm_iommu_map,
97 .unmap = msm_iommu_unmap,
98 .destroy = msm_iommu_destroy,
99};
100
101struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
102{
103 struct msm_iommu *iommu;
104
105 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
106 if (!iommu)
107 return ERR_PTR(-ENOMEM);
108
109 iommu->domain = domain;
110 msm_mmu_init(&iommu->base, dev, &funcs);
111 iommu_set_fault_handler(domain, msm_fault_handler, iommu);
112
113 return &iommu->base;
114}