1 files changed, 516 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 000000000..44fbc0a12
--- /dev/null
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -0,0 +1,516 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2015-2018 Etnaviv Project
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+
+#include "common.xml.h"
+#include "etnaviv_cmdbuf.h"
+#include "etnaviv_drv.h"
+#include "etnaviv_gem.h"
+#include "etnaviv_gpu.h"
+#include "etnaviv_mmu.h"
+
+static void etnaviv_context_unmap(struct etnaviv_iommu_context *context,
+				 unsigned long iova, size_t size)
+{
+	size_t unmapped_page, unmapped = 0;
+	size_t pgsize = SZ_4K;
+
+	if (!IS_ALIGNED(iova | size, pgsize)) {
+		pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
+		       iova, size, pgsize);
+		return;
+	}
+
+	while (unmapped < size) {
+		unmapped_page = context->global->ops->unmap(context, iova,
+							    pgsize);
+		if (!unmapped_page)
+			break;
+
+		iova += unmapped_page;
+		unmapped += unmapped_page;
+	}
+}
+
+static int etnaviv_context_map(struct etnaviv_iommu_context *context,
+			      unsigned long iova, phys_addr_t paddr,
+			      size_t size, int prot)
+{
+	unsigned long orig_iova = iova;
+	size_t pgsize = SZ_4K;
+	size_t orig_size = size;
+	int ret = 0;
+
+	if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
+		pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
+		       iova, &paddr, size, pgsize);
+		return -EINVAL;
+	}
+
+	while (size) {
+		ret = context->global->ops->map(context, iova, paddr, pgsize,
+						prot);
+		if (ret)
+			break;
+
+		iova += pgsize;
+		paddr += pgsize;
+		size -= pgsize;
+	}
+
+	/* unroll mapping in case something went wrong */
+	if (ret)
+		etnaviv_context_unmap(context, orig_iova, orig_size - size);
+
+	return ret;
+}
+
+static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova,
+			     struct sg_table *sgt, unsigned len, int prot)
+{	struct scatterlist *sg;
+	unsigned int da = iova;
+	unsigned int i;
+	int ret;
+
+	if (!context || !sgt)
+		return -EINVAL;
+
+	for_each_sgtable_dma_sg(sgt, sg, i) {
+		phys_addr_t pa = sg_dma_address(sg) - sg->offset;
+		size_t bytes = sg_dma_len(sg) + sg->offset;
+
+		VERB("map[%d]: %08x %pap(%zx)", i, iova, &pa, bytes);
+
+		ret = etnaviv_context_map(context, da, pa, bytes, prot);
+		if (ret)
+			goto fail;
+
+		da += bytes;
+	}
+
+	return 0;
+
+fail:
+	etnaviv_context_unmap(context, iova, da - iova);
+	return ret;
+}
+
+static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova,
+				struct sg_table *sgt, unsigned len)
+{
+	struct scatterlist *sg;
+	unsigned int da = iova;
+	int i;
+
+	for_each_sgtable_dma_sg(sgt, sg, i) {
+		size_t bytes = sg_dma_len(sg) + sg->offset;
+
+		etnaviv_context_unmap(context, da, bytes);
+
+		VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
+
+		BUG_ON(!PAGE_ALIGNED(bytes));
+
+		da += bytes;
+	}
+}
+
+static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu_context *context,
+	struct etnaviv_vram_mapping *mapping)
+{
+	struct etnaviv_gem_object *etnaviv_obj = mapping->object;
+
+	etnaviv_iommu_unmap(context, mapping->vram_node.start,
+			    etnaviv_obj->sgt, etnaviv_obj->base.size);
+	drm_mm_remove_node(&mapping->vram_node);
+}
+
+static int etnaviv_iommu_find_iova(struct etnaviv_iommu_context *context,
+				   struct drm_mm_node *node, size_t size)
+{
+	struct etnaviv_vram_mapping *free = NULL;
+	enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
+	int ret;
+
+	lockdep_assert_held(&context->lock);
+
+	while (1) {
+		struct etnaviv_vram_mapping *m, *n;
+		struct drm_mm_scan scan;
+		struct list_head list;
+		bool found;
+
+		ret = drm_mm_insert_node_in_range(&context->mm, node,
+						  size, 0, 0, 0, U64_MAX, mode);
+		if (ret != -ENOSPC)
+			break;
+
+		/* Try to retire some entries */
+		drm_mm_scan_init(&scan, &context->mm, size, 0, 0, mode);
+
+		found = 0;
+		INIT_LIST_HEAD(&list);
+		list_for_each_entry(free, &context->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(&scan, &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(&scan, &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(&scan, &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 mapping_get finding
+		 * this mapping.
+		 */
+		list_for_each_entry_safe(m, n, &list, scan_node) {
+			etnaviv_iommu_remove_mapping(context, m);
+			etnaviv_iommu_context_put(m->context);
+			m->context = NULL;
+			list_del_init(&m->mmu_node);
+			list_del_init(&m->scan_node);
+		}
+
+		mode = DRM_MM_INSERT_EVICT;
+
+		/*
+		 * We removed enough mappings so that the new allocation will
+		 * succeed, retry the allocation one more time.
+		 */
+	}
+
+	return ret;
+}
+
+static int etnaviv_iommu_insert_exact(struct etnaviv_iommu_context *context,
+		   struct drm_mm_node *node, size_t size, u64 va)
+{
+	return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va,
+					   va + size, DRM_MM_INSERT_LOWEST);
+}
+
+int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context,
+	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
+	struct etnaviv_vram_mapping *mapping, u64 va)
+{
+	struct sg_table *sgt = etnaviv_obj->sgt;
+	struct drm_mm_node *node;
+	int ret;
+
+	lockdep_assert_held(&etnaviv_obj->lock);
+
+	mutex_lock(&context->lock);
+
+	/* v1 MMU can optimize single entry (contiguous) scatterlists */
+	if (context->global->version == ETNAVIV_IOMMU_V1 &&
+	    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, &context->mappings);
+			ret = 0;
+			goto unlock;
+		}
+	}
+
+	node = &mapping->vram_node;
+
+	if (va)
+		ret = etnaviv_iommu_insert_exact(context, node,
+						 etnaviv_obj->base.size, va);
+	else
+		ret = etnaviv_iommu_find_iova(context, node,
+					      etnaviv_obj->base.size);
+	if (ret < 0)
+		goto unlock;
+
+	mapping->iova = node->start;
+	ret = etnaviv_iommu_map(context, node->start, sgt, etnaviv_obj->base.size,
+				ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
+
+	if (ret < 0) {
+		drm_mm_remove_node(node);
+		goto unlock;
+	}
+
+	list_add_tail(&mapping->mmu_node, &context->mappings);
+	context->flush_seq++;
+unlock:
+	mutex_unlock(&context->lock);
+
+	return ret;
+}
+
+void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
+	struct etnaviv_vram_mapping *mapping)
+{
+	WARN_ON(mapping->use);
+
+	mutex_lock(&context->lock);
+
+	/* Bail if the mapping has been reaped by another thread */
+	if (!mapping->context) {
+		mutex_unlock(&context->lock);
+		return;
+	}
+
+	/* If the vram node is on the mm, unmap and remove the node */
+	if (mapping->vram_node.mm == &context->mm)
+		etnaviv_iommu_remove_mapping(context, mapping);
+
+	list_del(&mapping->mmu_node);
+	context->flush_seq++;
+	mutex_unlock(&context->lock);
+}
+
+static void etnaviv_iommu_context_free(struct kref *kref)
+{
+	struct etnaviv_iommu_context *context =
+		container_of(kref, struct etnaviv_iommu_context, refcount);
+
+	etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping);
+
+	context->global->ops->free(context);
+}
+void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context)
+{
+	kref_put(&context->refcount, etnaviv_iommu_context_free);
+}
+
+struct etnaviv_iommu_context *
+etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
+			   struct etnaviv_cmdbuf_suballoc *suballoc)
+{
+	struct etnaviv_iommu_context *ctx;
+	int ret;
+
+	if (global->version == ETNAVIV_IOMMU_V1)
+		ctx = etnaviv_iommuv1_context_alloc(global);
+	else
+		ctx = etnaviv_iommuv2_context_alloc(global);
+
+	if (!ctx)
+		return NULL;
+
+	ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping,
+					  global->memory_base);
+	if (ret)
+		goto out_free;
+
+	if (global->version == ETNAVIV_IOMMU_V1 &&
+	    ctx->cmdbuf_mapping.iova > 0x80000000) {
+		dev_err(global->dev,
+		        "command buffer outside valid memory window\n");
+		goto out_unmap;
+	}
+
+	return ctx;
+
+out_unmap:
+	etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping);
+out_free:
+	global->ops->free(ctx);
+	return NULL;
+}
+
+void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
+			   struct etnaviv_iommu_context *context)
+{
+	context->global->ops->restore(gpu, context);
+}
+
+int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context,
+				  struct etnaviv_vram_mapping *mapping,
+				  u32 memory_base, dma_addr_t paddr,
+				  size_t size)
+{
+	mutex_lock(&context->lock);
+
+	if (mapping->use > 0) {
+		mapping->use++;
+		mutex_unlock(&context->lock);
+		return 0;
+	}
+
+	/*
+	 * For MMUv1 we don't add the suballoc region to the pagetables, as
+	 * those GPUs can only work with cmdbufs accessed through the linear
+	 * window. Instead we manufacture a mapping to make it look uniform
+	 * to the upper layers.
+	 */
+	if (context->global->version == ETNAVIV_IOMMU_V1) {
+		mapping->iova = paddr - memory_base;
+	} else {
+		struct drm_mm_node *node = &mapping->vram_node;
+		int ret;
+
+		ret = etnaviv_iommu_find_iova(context, node, size);
+		if (ret < 0) {
+			mutex_unlock(&context->lock);
+			return ret;
+		}
+
+		mapping->iova = node->start;
+		ret = etnaviv_context_map(context, node->start, paddr, size,
+					  ETNAVIV_PROT_READ);
+		if (ret < 0) {
+			drm_mm_remove_node(node);
+			mutex_unlock(&context->lock);
+			return ret;
+		}
+
+		context->flush_seq++;
+	}
+
+	list_add_tail(&mapping->mmu_node, &context->mappings);
+	mapping->use = 1;
+
+	mutex_unlock(&context->lock);
+
+	return 0;
+}
+
+void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context,
+		  struct etnaviv_vram_mapping *mapping)
+{
+	struct drm_mm_node *node = &mapping->vram_node;
+
+	mutex_lock(&context->lock);
+	mapping->use--;
+
+	if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) {
+		mutex_unlock(&context->lock);
+		return;
+	}
+
+	etnaviv_context_unmap(context, node->start, node->size);
+	drm_mm_remove_node(node);
+	mutex_unlock(&context->lock);
+}
+
+size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context)
+{
+	return context->global->ops->dump_size(context);
+}
+
+void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf)
+{
+	context->global->ops->dump(context, buf);
+}
+
+int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu)
+{
+	enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1;
+	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
+	struct etnaviv_iommu_global *global;
+	struct device *dev = gpu->drm->dev;
+
+	if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)
+		version = ETNAVIV_IOMMU_V2;
+
+	if (priv->mmu_global) {
+		if (priv->mmu_global->version != version) {
+			dev_err(gpu->dev,
+				"MMU version doesn't match global version\n");
+			return -ENXIO;
+		}
+
+		priv->mmu_global->use++;
+		return 0;
+	}
+
+	global = kzalloc(sizeof(*global), GFP_KERNEL);
+	if (!global)
+		return -ENOMEM;
+
+	global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma,
+					    GFP_KERNEL);
+	if (!global->bad_page_cpu)
+		goto free_global;
+
+	memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32));
+
+	if (version == ETNAVIV_IOMMU_V2) {
+		global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE,
+					       &global->v2.pta_dma, GFP_KERNEL);
+		if (!global->v2.pta_cpu)
+			goto free_bad_page;
+	}
+
+	global->dev = dev;
+	global->version = version;
+	global->use = 1;
+	mutex_init(&global->lock);
+
+	if (version == ETNAVIV_IOMMU_V1)
+		global->ops = &etnaviv_iommuv1_ops;
+	else
+		global->ops = &etnaviv_iommuv2_ops;
+
+	priv->mmu_global = global;
+
+	return 0;
+
+free_bad_page:
+	dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma);
+free_global:
+	kfree(global);
+
+	return -ENOMEM;
+}
+
+void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu)
+{
+	struct etnaviv_drm_private *priv = gpu->drm->dev_private;
+	struct etnaviv_iommu_global *global = priv->mmu_global;
+
+	if (--global->use > 0)
+		return;
+
+	if (global->v2.pta_cpu)
+		dma_free_wc(global->dev, ETNAVIV_PTA_SIZE,
+			    global->v2.pta_cpu, global->v2.pta_dma);
+
+	if (global->bad_page_cpu)
+		dma_free_wc(global->dev, SZ_4K,
+			    global->bad_page_cpu, global->bad_page_dma);
+
+	mutex_destroy(&global->lock);
+	kfree(global);
+
+	priv->mmu_global = NULL;
+}