LXR linux/drivers/gpu/drm/msm/msm

   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);
  70
  71        return (ret == len) ? 0 : -EINVAL;
  72}
  73
  74static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova, unsigned len)
  75{
  76        struct msm_iommu *iommu = to_msm_iommu(mmu);
  77
  78        pm_runtime_get_sync(mmu->dev);
  79        iommu_unmap(iommu->domain, iova, len);
  80        pm_runtime_put_sync(mmu->dev);
  81
  82        return 0;
  83}
  84
  85static void msm_iommu_destroy(struct msm_mmu *mmu)
  86{
  87        struct msm_iommu *iommu = to_msm_iommu(mmu);
  88        iommu_domain_free(iommu->domain);
  89        kfree(iommu);
  90}
  91
  92static const struct msm_mmu_funcs funcs = {
  93                .attach = msm_iommu_attach,
  94                .detach = msm_iommu_detach,
  95                .map = msm_iommu_map,
  96                .unmap = msm_iommu_unmap,
  97                .destroy = msm_iommu_destroy,
  98};
  99
 100struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
 101{
 102        struct msm_iommu *iommu;
 103
 104        iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
 105        if (!iommu)
 106                return ERR_PTR(-ENOMEM);
 107
 108        iommu->domain = domain;
 109        msm_mmu_init(&iommu->base, dev, &funcs);
 110        iommu_set_fault_handler(domain, msm_fault_handler, iommu);
 111
 112        return &iommu->base;
 113}
 114