cregit-Linux how code gets into the kernel

Release 4.11 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 *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; }

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark72100.00%3100.00%
Total72100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark43100.00%3100.00%
Total43100.00%3100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Stephane Viau3890.48%133.33%
Rob Clark49.52%266.67%
Total42100.00%3100.00%


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); struct iommu_domain *domain = iommu->domain; struct scatterlist *sg; unsigned long 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]: %08lx %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; }

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark19697.03%250.00%
Archit Taneja62.97%250.00%
Total202100.00%4100.00%


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); struct iommu_domain *domain = iommu->domain; struct scatterlist *sg; unsigned long 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]: %08lx(%zx)", i, da, bytes); BUG_ON(!PAGE_ALIGNED(bytes)); da += bytes; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark12698.44%250.00%
Archit Taneja10.78%125.00%
Fabian Frederick10.78%125.00%
Total128100.00%4100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark33100.00%1100.00%
Total33100.00%1100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Rob Clark81100.00%3100.00%
Total81100.00%3100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Rob Clark61192.30%660.00%
Stephane Viau436.50%110.00%
Archit Taneja71.06%220.00%
Fabian Frederick10.15%110.00%
Total662100.00%10100.00%
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