mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
cc69272673
In particular, attach() and unmap() need pm-runtime get/put to ensure iommu clks are enabled. Signed-off-by: Rob Clark <robdclark@gmail.com>
114 lines
3 KiB
C
114 lines
3 KiB
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 *domain, struct device *dev,
|
|
unsigned long iova, int flags, void *arg)
|
|
{
|
|
struct msm_iommu *iommu = arg;
|
|
if (iommu->base.handler)
|
|
return iommu->base.handler(iommu->base.arg, iova, flags);
|
|
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);
|
|
int ret;
|
|
|
|
pm_runtime_get_sync(mmu->dev);
|
|
ret = iommu_attach_device(iommu->domain, mmu->dev);
|
|
pm_runtime_put_sync(mmu->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names,
|
|
int cnt)
|
|
{
|
|
struct msm_iommu *iommu = to_msm_iommu(mmu);
|
|
|
|
pm_runtime_get_sync(mmu->dev);
|
|
iommu_detach_device(iommu->domain, mmu->dev);
|
|
pm_runtime_put_sync(mmu->dev);
|
|
}
|
|
|
|
static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
|
|
struct sg_table *sgt, unsigned len, int prot)
|
|
{
|
|
struct msm_iommu *iommu = to_msm_iommu(mmu);
|
|
size_t ret;
|
|
|
|
// pm_runtime_get_sync(mmu->dev);
|
|
ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
|
|
// pm_runtime_put_sync(mmu->dev);
|
|
WARN_ON(ret < 0);
|
|
|
|
return (ret == len) ? 0 : -EINVAL;
|
|
}
|
|
|
|
static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova,
|
|
struct sg_table *sgt, unsigned len)
|
|
{
|
|
struct msm_iommu *iommu = to_msm_iommu(mmu);
|
|
|
|
pm_runtime_get_sync(mmu->dev);
|
|
iommu_unmap(iommu->domain, iova, len);
|
|
pm_runtime_put_sync(mmu->dev);
|
|
|
|
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, iommu);
|
|
|
|
return &iommu->base;
|
|
}
|