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path: root/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
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Diffstat (limited to 'drivers/gpu/drm/etnaviv/etnaviv_mmu.c')
-rw-r--r--drivers/gpu/drm/etnaviv/etnaviv_mmu.c299
1 files changed, 299 insertions, 0 deletions
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
new file mode 100644
index 000000000000..6743bc648dc8
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -0,0 +1,299 @@
+/*
+ * Copyright (C) 2015 Etnaviv Project
+ *
+ * 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 "etnaviv_drv.h"
+#include "etnaviv_gem.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_mmu.h"
+
+static int etnaviv_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;
+}
+
+int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
+ struct sg_table *sgt, unsigned len, int prot)
+{
+ 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_dma_address(sg) - sg->offset;
+ size_t bytes = sg_dma_len(sg) + sg->offset;
+
+ VERB("map[%d]: %08x %08x(%zx)", 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_dma_len(sg) + sg->offset;
+
+ iommu_unmap(domain, da, bytes);
+ da += bytes;
+ }
+ return ret;
+}
+
+int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
+ struct sg_table *sgt, unsigned len)
+{
+ 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_dma_len(sg) + sg->offset;
+ size_t unmapped;
+
+ unmapped = iommu_unmap(domain, da, bytes);
+ if (unmapped < bytes)
+ return unmapped;
+
+ VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
+
+ BUG_ON(!PAGE_ALIGNED(bytes));
+
+ da += bytes;
+ }
+
+ return 0;
+}
+
+static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
+ struct etnaviv_vram_mapping *mapping)
+{
+ struct etnaviv_gem_object *etnaviv_obj = mapping->object;
+
+ etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
+ etnaviv_obj->sgt, etnaviv_obj->base.size);
+ drm_mm_remove_node(&mapping->vram_node);
+}
+
+int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
+ struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
+ struct etnaviv_vram_mapping *mapping)
+{
+ struct etnaviv_vram_mapping *free = NULL;
+ struct sg_table *sgt = etnaviv_obj->sgt;
+ struct drm_mm_node *node;
+ int ret;
+
+ lockdep_assert_held(&etnaviv_obj->lock);
+
+ mutex_lock(&mmu->lock);
+
+ /* v1 MMU can optimize single entry (contiguous) scatterlists */
+ if (sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
+ u32 iova;
+
+ iova = sg_dma_address(sgt->sgl) - memory_base;
+ if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
+ mapping->iova = iova;
+ list_add_tail(&mapping->mmu_node, &mmu->mappings);
+ mutex_unlock(&mmu->lock);
+ return 0;
+ }
+ }
+
+ node = &mapping->vram_node;
+ while (1) {
+ struct etnaviv_vram_mapping *m, *n;
+ struct list_head list;
+ bool found;
+
+ ret = drm_mm_insert_node_in_range(&mmu->mm, node,
+ etnaviv_obj->base.size, 0, mmu->last_iova, ~0UL,
+ DRM_MM_SEARCH_DEFAULT);
+
+ if (ret != -ENOSPC)
+ break;
+
+ /*
+ * If we did not search from the start of the MMU region,
+ * try again in case there are free slots.
+ */
+ if (mmu->last_iova) {
+ mmu->last_iova = 0;
+ mmu->need_flush = true;
+ continue;
+ }
+
+ /* Try to retire some entries */
+ drm_mm_init_scan(&mmu->mm, etnaviv_obj->base.size, 0, 0);
+
+ found = 0;
+ INIT_LIST_HEAD(&list);
+ list_for_each_entry(free, &mmu->mappings, mmu_node) {
+ /* If this vram node has not been used, skip this. */
+ if (!free->vram_node.mm)
+ continue;
+
+ /*
+ * If the iova is pinned, then it's in-use,
+ * so we must keep its mapping.
+ */
+ if (free->use)
+ continue;
+
+ list_add(&free->scan_node, &list);
+ if (drm_mm_scan_add_block(&free->vram_node)) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ /* Nothing found, clean up and fail */
+ list_for_each_entry_safe(m, n, &list, scan_node)
+ BUG_ON(drm_mm_scan_remove_block(&m->vram_node));
+ break;
+ }
+
+ /*
+ * drm_mm does not allow any other operations while
+ * scanning, so we have to remove all blocks first.
+ * If drm_mm_scan_remove_block() returns false, we
+ * can leave the block pinned.
+ */
+ list_for_each_entry_safe(m, n, &list, scan_node)
+ if (!drm_mm_scan_remove_block(&m->vram_node))
+ list_del_init(&m->scan_node);
+
+ /*
+ * Unmap the blocks which need to be reaped from the MMU.
+ * Clear the mmu pointer to prevent the get_iova finding
+ * this mapping.
+ */
+ list_for_each_entry_safe(m, n, &list, scan_node) {
+ etnaviv_iommu_remove_mapping(mmu, m);
+ m->mmu = NULL;
+ list_del_init(&m->mmu_node);
+ list_del_init(&m->scan_node);
+ }
+
+ /*
+ * We removed enough mappings so that the new allocation will
+ * succeed. Ensure that the MMU will be flushed before the
+ * associated commit requesting this mapping, and retry the
+ * allocation one more time.
+ */
+ mmu->need_flush = true;
+ }
+
+ if (ret < 0) {
+ mutex_unlock(&mmu->lock);
+ return ret;
+ }
+
+ mmu->last_iova = node->start + etnaviv_obj->base.size;
+ mapping->iova = node->start;
+ ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
+ IOMMU_READ | IOMMU_WRITE);
+
+ if (ret < 0) {
+ drm_mm_remove_node(node);
+ mutex_unlock(&mmu->lock);
+ return ret;
+ }
+
+ list_add_tail(&mapping->mmu_node, &mmu->mappings);
+ mutex_unlock(&mmu->lock);
+
+ return ret;
+}
+
+void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
+ struct etnaviv_vram_mapping *mapping)
+{
+ WARN_ON(mapping->use);
+
+ mutex_lock(&mmu->lock);
+
+ /* If the vram node is on the mm, unmap and remove the node */
+ if (mapping->vram_node.mm == &mmu->mm)
+ etnaviv_iommu_remove_mapping(mmu, mapping);
+
+ list_del(&mapping->mmu_node);
+ mutex_unlock(&mmu->lock);
+}
+
+void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
+{
+ drm_mm_takedown(&mmu->mm);
+ iommu_domain_free(mmu->domain);
+ kfree(mmu);
+}
+
+struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu,
+ struct iommu_domain *domain, enum etnaviv_iommu_version version)
+{
+ struct etnaviv_iommu *mmu;
+
+ mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
+ if (!mmu)
+ return ERR_PTR(-ENOMEM);
+
+ mmu->domain = domain;
+ mmu->gpu = gpu;
+ mmu->version = version;
+ mutex_init(&mmu->lock);
+ INIT_LIST_HEAD(&mmu->mappings);
+
+ drm_mm_init(&mmu->mm, domain->geometry.aperture_start,
+ domain->geometry.aperture_end -
+ domain->geometry.aperture_start + 1);
+
+ iommu_set_fault_handler(domain, etnaviv_fault_handler, gpu->dev);
+
+ return mmu;
+}
+
+size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
+{
+ struct etnaviv_iommu_ops *ops;
+
+ ops = container_of(iommu->domain->ops, struct etnaviv_iommu_ops, ops);
+
+ return ops->dump_size(iommu->domain);
+}
+
+void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
+{
+ struct etnaviv_iommu_ops *ops;
+
+ ops = container_of(iommu->domain->ops, struct etnaviv_iommu_ops, ops);
+
+ ops->dump(iommu->domain, buf);
+}