393 lines
9.5 KiB
C
393 lines
9.5 KiB
C
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/*
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* Copyright (C) 2015 Etnaviv Project
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "common.xml.h"
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#include "etnaviv_drv.h"
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#include "etnaviv_gem.h"
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#include "etnaviv_gpu.h"
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#include "etnaviv_iommu.h"
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#include "etnaviv_mmu.h"
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static int etnaviv_fault_handler(struct iommu_domain *iommu, struct device *dev,
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unsigned long iova, int flags, void *arg)
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{
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DBG("*** fault: iova=%08lx, flags=%d", iova, flags);
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return 0;
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}
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int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
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struct sg_table *sgt, unsigned len, int prot)
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{
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struct iommu_domain *domain = iommu->domain;
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struct scatterlist *sg;
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unsigned int da = iova;
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unsigned int i, j;
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int ret;
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if (!domain || !sgt)
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return -EINVAL;
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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u32 pa = sg_dma_address(sg) - sg->offset;
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size_t bytes = sg_dma_len(sg) + sg->offset;
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VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
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ret = iommu_map(domain, da, pa, bytes, prot);
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if (ret)
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goto fail;
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da += bytes;
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}
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return 0;
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fail:
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da = iova;
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for_each_sg(sgt->sgl, sg, i, j) {
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size_t bytes = sg_dma_len(sg) + sg->offset;
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iommu_unmap(domain, da, bytes);
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da += bytes;
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}
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return ret;
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}
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int etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
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struct sg_table *sgt, unsigned len)
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{
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struct iommu_domain *domain = iommu->domain;
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struct scatterlist *sg;
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unsigned int da = iova;
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int i;
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for_each_sg(sgt->sgl, sg, sgt->nents, i) {
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size_t bytes = sg_dma_len(sg) + sg->offset;
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size_t unmapped;
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unmapped = iommu_unmap(domain, da, bytes);
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if (unmapped < bytes)
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return unmapped;
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VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
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BUG_ON(!PAGE_ALIGNED(bytes));
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da += bytes;
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}
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return 0;
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}
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static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
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struct etnaviv_vram_mapping *mapping)
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{
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struct etnaviv_gem_object *etnaviv_obj = mapping->object;
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etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
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etnaviv_obj->sgt, etnaviv_obj->base.size);
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drm_mm_remove_node(&mapping->vram_node);
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}
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static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
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struct drm_mm_node *node, size_t size)
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{
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struct etnaviv_vram_mapping *free = NULL;
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int ret;
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lockdep_assert_held(&mmu->lock);
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while (1) {
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struct etnaviv_vram_mapping *m, *n;
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struct list_head list;
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bool found;
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/*
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* XXX: The DRM_MM_SEARCH_BELOW is really a hack to trick
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* drm_mm into giving out a low IOVA after address space
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* rollover. This needs a proper fix.
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*/
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ret = drm_mm_insert_node_in_range(&mmu->mm, node,
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size, 0, mmu->last_iova, ~0UL,
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mmu->last_iova ? DRM_MM_SEARCH_DEFAULT : DRM_MM_SEARCH_BELOW);
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if (ret != -ENOSPC)
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break;
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/*
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* If we did not search from the start of the MMU region,
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* try again in case there are free slots.
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*/
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if (mmu->last_iova) {
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mmu->last_iova = 0;
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mmu->flush_seq++;
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continue;
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}
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/* Try to retire some entries */
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drm_mm_init_scan(&mmu->mm, size, 0, 0);
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found = 0;
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INIT_LIST_HEAD(&list);
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list_for_each_entry(free, &mmu->mappings, mmu_node) {
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/* If this vram node has not been used, skip this. */
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if (!free->vram_node.mm)
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continue;
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/*
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* If the iova is pinned, then it's in-use,
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* so we must keep its mapping.
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*/
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if (free->use)
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continue;
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list_add(&free->scan_node, &list);
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if (drm_mm_scan_add_block(&free->vram_node)) {
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found = true;
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break;
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}
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}
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if (!found) {
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/* Nothing found, clean up and fail */
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list_for_each_entry_safe(m, n, &list, scan_node)
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BUG_ON(drm_mm_scan_remove_block(&m->vram_node));
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break;
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}
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/*
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* drm_mm does not allow any other operations while
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* scanning, so we have to remove all blocks first.
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* If drm_mm_scan_remove_block() returns false, we
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* can leave the block pinned.
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*/
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list_for_each_entry_safe(m, n, &list, scan_node)
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if (!drm_mm_scan_remove_block(&m->vram_node))
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list_del_init(&m->scan_node);
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/*
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* Unmap the blocks which need to be reaped from the MMU.
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* Clear the mmu pointer to prevent the mapping_get finding
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* this mapping.
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*/
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list_for_each_entry_safe(m, n, &list, scan_node) {
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etnaviv_iommu_remove_mapping(mmu, m);
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m->mmu = NULL;
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list_del_init(&m->mmu_node);
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list_del_init(&m->scan_node);
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}
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/*
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* We removed enough mappings so that the new allocation will
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* succeed. Ensure that the MMU will be flushed before the
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* associated commit requesting this mapping, and retry the
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* allocation one more time.
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*/
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mmu->flush_seq++;
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}
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return ret;
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}
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int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
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struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
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struct etnaviv_vram_mapping *mapping)
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{
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struct sg_table *sgt = etnaviv_obj->sgt;
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struct drm_mm_node *node;
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int ret;
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lockdep_assert_held(&etnaviv_obj->lock);
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mutex_lock(&mmu->lock);
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/* v1 MMU can optimize single entry (contiguous) scatterlists */
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if (mmu->version == ETNAVIV_IOMMU_V1 &&
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sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
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u32 iova;
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iova = sg_dma_address(sgt->sgl) - memory_base;
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if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
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mapping->iova = iova;
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list_add_tail(&mapping->mmu_node, &mmu->mappings);
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mutex_unlock(&mmu->lock);
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return 0;
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}
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}
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node = &mapping->vram_node;
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ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
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if (ret < 0) {
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mutex_unlock(&mmu->lock);
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return ret;
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}
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mmu->last_iova = node->start + etnaviv_obj->base.size;
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mapping->iova = node->start;
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ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
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IOMMU_READ | IOMMU_WRITE);
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if (ret < 0) {
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drm_mm_remove_node(node);
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mutex_unlock(&mmu->lock);
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return ret;
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}
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list_add_tail(&mapping->mmu_node, &mmu->mappings);
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mutex_unlock(&mmu->lock);
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return ret;
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}
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void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
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struct etnaviv_vram_mapping *mapping)
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{
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WARN_ON(mapping->use);
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mutex_lock(&mmu->lock);
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/* If the vram node is on the mm, unmap and remove the node */
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if (mapping->vram_node.mm == &mmu->mm)
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etnaviv_iommu_remove_mapping(mmu, mapping);
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list_del(&mapping->mmu_node);
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mutex_unlock(&mmu->lock);
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}
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void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
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{
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drm_mm_takedown(&mmu->mm);
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iommu_domain_free(mmu->domain);
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kfree(mmu);
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}
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struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu)
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{
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enum etnaviv_iommu_version version;
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struct etnaviv_iommu *mmu;
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mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
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if (!mmu)
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return ERR_PTR(-ENOMEM);
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if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
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mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
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version = ETNAVIV_IOMMU_V1;
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} else {
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mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
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version = ETNAVIV_IOMMU_V2;
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}
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if (!mmu->domain) {
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dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
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kfree(mmu);
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return ERR_PTR(-ENOMEM);
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}
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mmu->gpu = gpu;
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mmu->version = version;
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mutex_init(&mmu->lock);
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INIT_LIST_HEAD(&mmu->mappings);
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drm_mm_init(&mmu->mm, mmu->domain->geometry.aperture_start,
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mmu->domain->geometry.aperture_end -
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mmu->domain->geometry.aperture_start + 1);
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iommu_set_fault_handler(mmu->domain, etnaviv_fault_handler, gpu->dev);
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return mmu;
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}
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void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
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{
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if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
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etnaviv_iommuv1_restore(gpu);
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else
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etnaviv_iommuv2_restore(gpu);
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}
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u32 etnaviv_iommu_get_cmdbuf_va(struct etnaviv_gpu *gpu,
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struct etnaviv_cmdbuf *buf)
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{
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struct etnaviv_iommu *mmu = gpu->mmu;
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if (mmu->version == ETNAVIV_IOMMU_V1) {
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return buf->paddr - gpu->memory_base;
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} else {
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int ret;
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if (buf->vram_node.allocated)
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return (u32)buf->vram_node.start;
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mutex_lock(&mmu->lock);
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ret = etnaviv_iommu_find_iova(mmu, &buf->vram_node,
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buf->size + SZ_64K);
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if (ret < 0) {
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mutex_unlock(&mmu->lock);
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return 0;
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}
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ret = iommu_map(mmu->domain, buf->vram_node.start, buf->paddr,
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buf->size, IOMMU_READ);
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if (ret < 0) {
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drm_mm_remove_node(&buf->vram_node);
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mutex_unlock(&mmu->lock);
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return 0;
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}
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/*
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* At least on GC3000 the FE MMU doesn't properly flush old TLB
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* entries. Make sure to space the command buffers out in a way
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* that the FE MMU prefetch won't load invalid entries.
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*/
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mmu->last_iova = buf->vram_node.start + buf->size + SZ_64K;
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mmu->flush_seq++;
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mutex_unlock(&mmu->lock);
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return (u32)buf->vram_node.start;
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}
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}
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void etnaviv_iommu_put_cmdbuf_va(struct etnaviv_gpu *gpu,
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struct etnaviv_cmdbuf *buf)
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{
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struct etnaviv_iommu *mmu = gpu->mmu;
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if (mmu->version == ETNAVIV_IOMMU_V2 && buf->vram_node.allocated) {
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mutex_lock(&mmu->lock);
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|
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iommu_unmap(mmu->domain, buf->vram_node.start, buf->size);
|
||
|
|
drm_mm_remove_node(&buf->vram_node);
|
||
|
|
mutex_unlock(&mmu->lock);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
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);
|
||
|
|
}
|