Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Rob Herring | 2927 | 91.10% | 12 | 50.00% |
Boris Brezillon | 106 | 3.30% | 3 | 12.50% |
Steven Price | 85 | 2.65% | 1 | 4.17% |
Linus Torvalds | 43 | 1.34% | 1 | 4.17% |
Wei Yongjun | 22 | 0.68% | 1 | 4.17% |
Tomeu Vizoso | 13 | 0.40% | 1 | 4.17% |
Will Deacon | 8 | 0.25% | 2 | 8.33% |
Robin Murphy | 5 | 0.16% | 1 | 4.17% |
Ezequiel García | 2 | 0.06% | 1 | 4.17% |
Yi Wang | 2 | 0.06% | 1 | 4.17% |
Total | 3213 | 24 |
// SPDX-License-Identifier: GPL-2.0 /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */ #include <linux/atomic.h> #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/io-pgtable.h> #include <linux/iommu.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/shmem_fs.h> #include <linux/sizes.h> #include "panfrost_device.h" #include "panfrost_mmu.h" #include "panfrost_gem.h" #include "panfrost_features.h" #include "panfrost_regs.h" #define mmu_write(dev, reg, data) writel(data, dev->iomem + reg) #define mmu_read(dev, reg) readl(dev->iomem + reg) static int wait_ready(struct panfrost_device *pfdev, u32 as_nr) { int ret; u32 val; /* Wait for the MMU status to indicate there is no active command, in * case one is pending. */ ret = readl_relaxed_poll_timeout_atomic(pfdev->iomem + AS_STATUS(as_nr), val, !(val & AS_STATUS_AS_ACTIVE), 10, 1000); if (ret) dev_err(pfdev->dev, "AS_ACTIVE bit stuck\n"); return ret; } static int write_cmd(struct panfrost_device *pfdev, u32 as_nr, u32 cmd) { int status; /* write AS_COMMAND when MMU is ready to accept another command */ status = wait_ready(pfdev, as_nr); if (!status) mmu_write(pfdev, AS_COMMAND(as_nr), cmd); return status; } static void lock_region(struct panfrost_device *pfdev, u32 as_nr, u64 iova, size_t size) { u8 region_width; u64 region = iova & PAGE_MASK; /* * fls returns: * 1 .. 32 * * 10 + fls(num_pages) * results in the range (11 .. 42) */ size = round_up(size, PAGE_SIZE); region_width = 10 + fls(size >> PAGE_SHIFT); if ((size >> PAGE_SHIFT) != (1ul << (region_width - 11))) { /* not pow2, so must go up to the next pow2 */ region_width += 1; } region |= region_width; /* Lock the region that needs to be updated */ mmu_write(pfdev, AS_LOCKADDR_LO(as_nr), region & 0xFFFFFFFFUL); mmu_write(pfdev, AS_LOCKADDR_HI(as_nr), (region >> 32) & 0xFFFFFFFFUL); write_cmd(pfdev, as_nr, AS_COMMAND_LOCK); } static int mmu_hw_do_operation_locked(struct panfrost_device *pfdev, int as_nr, u64 iova, size_t size, u32 op) { if (as_nr < 0) return 0; if (op != AS_COMMAND_UNLOCK) lock_region(pfdev, as_nr, iova, size); /* Run the MMU operation */ write_cmd(pfdev, as_nr, op); /* Wait for the flush to complete */ return wait_ready(pfdev, as_nr); } static int mmu_hw_do_operation(struct panfrost_device *pfdev, struct panfrost_mmu *mmu, u64 iova, size_t size, u32 op) { int ret; spin_lock(&pfdev->as_lock); ret = mmu_hw_do_operation_locked(pfdev, mmu->as, iova, size, op); spin_unlock(&pfdev->as_lock); return ret; } static void panfrost_mmu_enable(struct panfrost_device *pfdev, struct panfrost_mmu *mmu) { int as_nr = mmu->as; struct io_pgtable_cfg *cfg = &mmu->pgtbl_cfg; u64 transtab = cfg->arm_mali_lpae_cfg.transtab; u64 memattr = cfg->arm_mali_lpae_cfg.memattr; mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM); mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), transtab & 0xffffffffUL); mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), transtab >> 32); /* Need to revisit mem attrs. * NC is the default, Mali driver is inner WT. */ mmu_write(pfdev, AS_MEMATTR_LO(as_nr), memattr & 0xffffffffUL); mmu_write(pfdev, AS_MEMATTR_HI(as_nr), memattr >> 32); write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE); } static void panfrost_mmu_disable(struct panfrost_device *pfdev, u32 as_nr) { mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM); mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), 0); mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), 0); mmu_write(pfdev, AS_MEMATTR_LO(as_nr), 0); mmu_write(pfdev, AS_MEMATTR_HI(as_nr), 0); write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE); } u32 panfrost_mmu_as_get(struct panfrost_device *pfdev, struct panfrost_mmu *mmu) { int as; spin_lock(&pfdev->as_lock); as = mmu->as; if (as >= 0) { int en = atomic_inc_return(&mmu->as_count); /* * AS can be retained by active jobs or a perfcnt context, * hence the '+ 1' here. */ WARN_ON(en >= (NUM_JOB_SLOTS + 1)); list_move(&mmu->list, &pfdev->as_lru_list); goto out; } /* Check for a free AS */ as = ffz(pfdev->as_alloc_mask); if (!(BIT(as) & pfdev->features.as_present)) { struct panfrost_mmu *lru_mmu; list_for_each_entry_reverse(lru_mmu, &pfdev->as_lru_list, list) { if (!atomic_read(&lru_mmu->as_count)) break; } WARN_ON(&lru_mmu->list == &pfdev->as_lru_list); list_del_init(&lru_mmu->list); as = lru_mmu->as; WARN_ON(as < 0); lru_mmu->as = -1; } /* Assign the free or reclaimed AS to the FD */ mmu->as = as; set_bit(as, &pfdev->as_alloc_mask); atomic_set(&mmu->as_count, 1); list_add(&mmu->list, &pfdev->as_lru_list); dev_dbg(pfdev->dev, "Assigned AS%d to mmu %p, alloc_mask=%lx", as, mmu, pfdev->as_alloc_mask); panfrost_mmu_enable(pfdev, mmu); out: spin_unlock(&pfdev->as_lock); return as; } void panfrost_mmu_as_put(struct panfrost_device *pfdev, struct panfrost_mmu *mmu) { atomic_dec(&mmu->as_count); WARN_ON(atomic_read(&mmu->as_count) < 0); } void panfrost_mmu_reset(struct panfrost_device *pfdev) { struct panfrost_mmu *mmu, *mmu_tmp; spin_lock(&pfdev->as_lock); pfdev->as_alloc_mask = 0; list_for_each_entry_safe(mmu, mmu_tmp, &pfdev->as_lru_list, list) { mmu->as = -1; atomic_set(&mmu->as_count, 0); list_del_init(&mmu->list); } spin_unlock(&pfdev->as_lock); mmu_write(pfdev, MMU_INT_CLEAR, ~0); mmu_write(pfdev, MMU_INT_MASK, ~0); } static size_t get_pgsize(u64 addr, size_t size) { if (addr & (SZ_2M - 1) || size < SZ_2M) return SZ_4K; return SZ_2M; } static void panfrost_mmu_flush_range(struct panfrost_device *pfdev, struct panfrost_mmu *mmu, u64 iova, size_t size) { if (mmu->as < 0) return; pm_runtime_get_noresume(pfdev->dev); /* Flush the PTs only if we're already awake */ if (pm_runtime_active(pfdev->dev)) mmu_hw_do_operation(pfdev, mmu, iova, size, AS_COMMAND_FLUSH_PT); pm_runtime_put_sync_autosuspend(pfdev->dev); } static int mmu_map_sg(struct panfrost_device *pfdev, struct panfrost_mmu *mmu, u64 iova, int prot, struct sg_table *sgt) { unsigned int count; struct scatterlist *sgl; struct io_pgtable_ops *ops = mmu->pgtbl_ops; u64 start_iova = iova; for_each_sg(sgt->sgl, sgl, sgt->nents, count) { unsigned long paddr = sg_dma_address(sgl); size_t len = sg_dma_len(sgl); dev_dbg(pfdev->dev, "map: as=%d, iova=%llx, paddr=%lx, len=%zx", mmu->as, iova, paddr, len); while (len) { size_t pgsize = get_pgsize(iova | paddr, len); ops->map(ops, iova, paddr, pgsize, prot); iova += pgsize; paddr += pgsize; len -= pgsize; } } panfrost_mmu_flush_range(pfdev, mmu, start_iova, iova - start_iova); return 0; } int panfrost_mmu_map(struct panfrost_gem_mapping *mapping) { struct panfrost_gem_object *bo = mapping->obj; struct drm_gem_object *obj = &bo->base.base; struct panfrost_device *pfdev = to_panfrost_device(obj->dev); struct sg_table *sgt; int prot = IOMMU_READ | IOMMU_WRITE; if (WARN_ON(mapping->active)) return 0; if (bo->noexec) prot |= IOMMU_NOEXEC; sgt = drm_gem_shmem_get_pages_sgt(obj); if (WARN_ON(IS_ERR(sgt))) return PTR_ERR(sgt); mmu_map_sg(pfdev, mapping->mmu, mapping->mmnode.start << PAGE_SHIFT, prot, sgt); mapping->active = true; return 0; } void panfrost_mmu_unmap(struct panfrost_gem_mapping *mapping) { struct panfrost_gem_object *bo = mapping->obj; struct drm_gem_object *obj = &bo->base.base; struct panfrost_device *pfdev = to_panfrost_device(obj->dev); struct io_pgtable_ops *ops = mapping->mmu->pgtbl_ops; u64 iova = mapping->mmnode.start << PAGE_SHIFT; size_t len = mapping->mmnode.size << PAGE_SHIFT; size_t unmapped_len = 0; if (WARN_ON(!mapping->active)) return; dev_dbg(pfdev->dev, "unmap: as=%d, iova=%llx, len=%zx", mapping->mmu->as, iova, len); while (unmapped_len < len) { size_t unmapped_page; size_t pgsize = get_pgsize(iova, len - unmapped_len); if (ops->iova_to_phys(ops, iova)) { unmapped_page = ops->unmap(ops, iova, pgsize, NULL); WARN_ON(unmapped_page != pgsize); } iova += pgsize; unmapped_len += pgsize; } panfrost_mmu_flush_range(pfdev, mapping->mmu, mapping->mmnode.start << PAGE_SHIFT, len); mapping->active = false; } static void mmu_tlb_inv_context_s1(void *cookie) {} static void mmu_tlb_sync_context(void *cookie) { //struct panfrost_device *pfdev = cookie; // TODO: Wait 1000 GPU cycles for HW_ISSUE_6367/T60X } static void mmu_tlb_flush_walk(unsigned long iova, size_t size, size_t granule, void *cookie) { mmu_tlb_sync_context(cookie); } static void mmu_tlb_flush_leaf(unsigned long iova, size_t size, size_t granule, void *cookie) { mmu_tlb_sync_context(cookie); } static const struct iommu_flush_ops mmu_tlb_ops = { .tlb_flush_all = mmu_tlb_inv_context_s1, .tlb_flush_walk = mmu_tlb_flush_walk, .tlb_flush_leaf = mmu_tlb_flush_leaf, }; int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv) { struct panfrost_mmu *mmu = &priv->mmu; struct panfrost_device *pfdev = priv->pfdev; INIT_LIST_HEAD(&mmu->list); mmu->as = -1; mmu->pgtbl_cfg = (struct io_pgtable_cfg) { .pgsize_bitmap = SZ_4K | SZ_2M, .ias = FIELD_GET(0xff, pfdev->features.mmu_features), .oas = FIELD_GET(0xff00, pfdev->features.mmu_features), .tlb = &mmu_tlb_ops, .iommu_dev = pfdev->dev, }; mmu->pgtbl_ops = alloc_io_pgtable_ops(ARM_MALI_LPAE, &mmu->pgtbl_cfg, priv); if (!mmu->pgtbl_ops) return -EINVAL; return 0; } void panfrost_mmu_pgtable_free(struct panfrost_file_priv *priv) { struct panfrost_device *pfdev = priv->pfdev; struct panfrost_mmu *mmu = &priv->mmu; spin_lock(&pfdev->as_lock); if (mmu->as >= 0) { pm_runtime_get_noresume(pfdev->dev); if (pm_runtime_active(pfdev->dev)) panfrost_mmu_disable(pfdev, mmu->as); pm_runtime_put_autosuspend(pfdev->dev); clear_bit(mmu->as, &pfdev->as_alloc_mask); clear_bit(mmu->as, &pfdev->as_in_use_mask); list_del(&mmu->list); } spin_unlock(&pfdev->as_lock); free_io_pgtable_ops(mmu->pgtbl_ops); } static struct panfrost_gem_mapping * addr_to_mapping(struct panfrost_device *pfdev, int as, u64 addr) { struct panfrost_gem_mapping *mapping = NULL; struct panfrost_file_priv *priv; struct drm_mm_node *node; u64 offset = addr >> PAGE_SHIFT; struct panfrost_mmu *mmu; spin_lock(&pfdev->as_lock); list_for_each_entry(mmu, &pfdev->as_lru_list, list) { if (as == mmu->as) goto found_mmu; } goto out; found_mmu: priv = container_of(mmu, struct panfrost_file_priv, mmu); spin_lock(&priv->mm_lock); drm_mm_for_each_node(node, &priv->mm) { if (offset >= node->start && offset < (node->start + node->size)) { mapping = drm_mm_node_to_panfrost_mapping(node); kref_get(&mapping->refcount); break; } } spin_unlock(&priv->mm_lock); out: spin_unlock(&pfdev->as_lock); return mapping; } #define NUM_FAULT_PAGES (SZ_2M / PAGE_SIZE) static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, u64 addr) { int ret, i; struct panfrost_gem_mapping *bomapping; struct panfrost_gem_object *bo; struct address_space *mapping; pgoff_t page_offset; struct sg_table *sgt; struct page **pages; bomapping = addr_to_mapping(pfdev, as, addr); if (!bomapping) return -ENOENT; bo = bomapping->obj; if (!bo->is_heap) { dev_WARN(pfdev->dev, "matching BO is not heap type (GPU VA = %llx)", bomapping->mmnode.start << PAGE_SHIFT); ret = -EINVAL; goto err_bo; } WARN_ON(bomapping->mmu->as != as); /* Assume 2MB alignment and size multiple */ addr &= ~((u64)SZ_2M - 1); page_offset = addr >> PAGE_SHIFT; page_offset -= bomapping->mmnode.start; mutex_lock(&bo->base.pages_lock); if (!bo->base.pages) { bo->sgts = kvmalloc_array(bo->base.base.size / SZ_2M, sizeof(struct sg_table), GFP_KERNEL | __GFP_ZERO); if (!bo->sgts) { mutex_unlock(&bo->base.pages_lock); ret = -ENOMEM; goto err_bo; } pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT, sizeof(struct page *), GFP_KERNEL | __GFP_ZERO); if (!pages) { kfree(bo->sgts); bo->sgts = NULL; mutex_unlock(&bo->base.pages_lock); ret = -ENOMEM; goto err_bo; } bo->base.pages = pages; bo->base.pages_use_count = 1; } else pages = bo->base.pages; mapping = bo->base.base.filp->f_mapping; mapping_set_unevictable(mapping); for (i = page_offset; i < page_offset + NUM_FAULT_PAGES; i++) { pages[i] = shmem_read_mapping_page(mapping, i); if (IS_ERR(pages[i])) { mutex_unlock(&bo->base.pages_lock); ret = PTR_ERR(pages[i]); goto err_pages; } } mutex_unlock(&bo->base.pages_lock); sgt = &bo->sgts[page_offset / (SZ_2M / PAGE_SIZE)]; ret = sg_alloc_table_from_pages(sgt, pages + page_offset, NUM_FAULT_PAGES, 0, SZ_2M, GFP_KERNEL); if (ret) goto err_pages; if (!dma_map_sg(pfdev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL)) { ret = -EINVAL; goto err_map; } mmu_map_sg(pfdev, bomapping->mmu, addr, IOMMU_WRITE | IOMMU_READ | IOMMU_NOEXEC, sgt); bomapping->active = true; dev_dbg(pfdev->dev, "mapped page fault @ AS%d %llx", as, addr); panfrost_gem_mapping_put(bomapping); return 0; err_map: sg_free_table(sgt); err_pages: drm_gem_shmem_put_pages(&bo->base); err_bo: drm_gem_object_put_unlocked(&bo->base.base); return ret; } static const char *access_type_name(struct panfrost_device *pfdev, u32 fault_status) { switch (fault_status & AS_FAULTSTATUS_ACCESS_TYPE_MASK) { case AS_FAULTSTATUS_ACCESS_TYPE_ATOMIC: if (panfrost_has_hw_feature(pfdev, HW_FEATURE_AARCH64_MMU)) return "ATOMIC"; else return "UNKNOWN"; case AS_FAULTSTATUS_ACCESS_TYPE_READ: return "READ"; case AS_FAULTSTATUS_ACCESS_TYPE_WRITE: return "WRITE"; case AS_FAULTSTATUS_ACCESS_TYPE_EX: return "EXECUTE"; default: WARN_ON(1); return NULL; } } static irqreturn_t panfrost_mmu_irq_handler(int irq, void *data) { struct panfrost_device *pfdev = data; if (!mmu_read(pfdev, MMU_INT_STAT)) return IRQ_NONE; mmu_write(pfdev, MMU_INT_MASK, 0); return IRQ_WAKE_THREAD; } static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data) { struct panfrost_device *pfdev = data; u32 status = mmu_read(pfdev, MMU_INT_RAWSTAT); int i, ret; for (i = 0; status; i++) { u32 mask = BIT(i) | BIT(i + 16); u64 addr; u32 fault_status; u32 exception_type; u32 access_type; u32 source_id; if (!(status & mask)) continue; fault_status = mmu_read(pfdev, AS_FAULTSTATUS(i)); addr = mmu_read(pfdev, AS_FAULTADDRESS_LO(i)); addr |= (u64)mmu_read(pfdev, AS_FAULTADDRESS_HI(i)) << 32; /* decode the fault status */ exception_type = fault_status & 0xFF; access_type = (fault_status >> 8) & 0x3; source_id = (fault_status >> 16); /* Page fault only */ ret = -1; if ((status & mask) == BIT(i) && (exception_type & 0xF8) == 0xC0) ret = panfrost_mmu_map_fault_addr(pfdev, i, addr); if (ret) /* terminal fault, print info about the fault */ dev_err(pfdev->dev, "Unhandled Page fault in AS%d at VA 0x%016llX\n" "Reason: %s\n" "raw fault status: 0x%X\n" "decoded fault status: %s\n" "exception type 0x%X: %s\n" "access type 0x%X: %s\n" "source id 0x%X\n", i, addr, "TODO", fault_status, (fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"), exception_type, panfrost_exception_name(pfdev, exception_type), access_type, access_type_name(pfdev, fault_status), source_id); mmu_write(pfdev, MMU_INT_CLEAR, mask); status &= ~mask; } mmu_write(pfdev, MMU_INT_MASK, ~0); return IRQ_HANDLED; }; int panfrost_mmu_init(struct panfrost_device *pfdev) { int err, irq; irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu"); if (irq <= 0) return -ENODEV; err = devm_request_threaded_irq(pfdev->dev, irq, panfrost_mmu_irq_handler, panfrost_mmu_irq_handler_thread, IRQF_SHARED, KBUILD_MODNAME "-mmu", pfdev); if (err) { dev_err(pfdev->dev, "failed to request mmu irq"); return err; } return 0; } void panfrost_mmu_fini(struct panfrost_device *pfdev) { mmu_write(pfdev, MMU_INT_MASK, 0); }
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