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path: root/drivers/gpu/drm/msm/msm_iommu.c
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Diffstat (limited to 'drivers/gpu/drm/msm/msm_iommu.c')
-rw-r--r--drivers/gpu/drm/msm/msm_iommu.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
new file mode 100644
index 000000000000..92b745986231
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -0,0 +1,148 @@
+/*
+ * 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)
+{
+ DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
+ return 0;
+}
+
+static int msm_iommu_attach(struct msm_mmu *mmu, const char **names, int cnt)
+{
+ struct drm_device *dev = mmu->dev;
+ struct msm_iommu *iommu = to_msm_iommu(mmu);
+ int i, ret;
+
+ for (i = 0; i < cnt; i++) {
+ struct device *msm_iommu_get_ctx(const char *ctx_name);
+ struct device *ctx = msm_iommu_get_ctx(names[i]);
+ if (IS_ERR_OR_NULL(ctx))
+ continue;
+ ret = iommu_attach_device(iommu->domain, ctx);
+ if (ret) {
+ dev_warn(dev->dev, "could not attach iommu to %s", names[i]);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+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) {
+ u32 pa = sg_phys(sg) - sg->offset;
+ size_t bytes = sg->length + sg->offset;
+
+ VERB("map[%d]: %08x %08x(%x)", i, iova, 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(%x)", i, iova, bytes);
+
+ BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE));
+
+ 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,
+ .map = msm_iommu_map,
+ .unmap = msm_iommu_unmap,
+ .destroy = msm_iommu_destroy,
+};
+
+struct msm_mmu *msm_iommu_new(struct drm_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;
+}