diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 459d61129dd09bc7c4386a2ebd1b16a7056c07c7..7c2c552ac7ed52fb2e7e5028b9ffebc6caac702a 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -113,8 +113,6 @@ config LOONGARCH select MODULES_USE_ELF_RELA if MODULES select NEED_PER_CPU_EMBED_FIRST_CHUNK select NEED_PER_CPU_PAGE_FIRST_CHUNK - select DMA_OPS - select ARCH_HAS_SETUP_DMA_OPS select OF select OF_EARLY_FLATTREE select PCI diff --git a/arch/loongarch/include/asm/dma-mapping.h b/arch/loongarch/include/asm/dma-mapping.h deleted file mode 100644 index 7014d581b549c74d041aaafbc4e35d84355d553d..0000000000000000000000000000000000000000 --- a/arch/loongarch/include/asm/dma-mapping.h +++ /dev/null @@ -1,20 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Copyright (C) 2020 Loongson Technology Corporation Limited - */ -#ifndef _ASM_DMA_MAPPING_H -#define _ASM_DMA_MAPPING_H - -extern const struct dma_map_ops loongson_dma_ops; -extern bool swiotlb_need_fix; -extern phys_addr_t io_tlb_start; - -static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) -{ - if (swiotlb_need_fix) - return &loongson_dma_ops; - else - return NULL; -} - -#endif /* _ASM_DMA_MAPPING_H */ diff --git a/arch/loongarch/kernel/dma.c b/arch/loongarch/kernel/dma.c index 2575e070bc87def04acfcaf6a6c72de81d475ce7..b7712b6001f36e859fc2d8164ffa1b38f0091511 100644 --- a/arch/loongarch/kernel/dma.c +++ b/arch/loongarch/kernel/dma.c @@ -7,8 +7,6 @@ #include #include #include -#include -#include #include #include @@ -19,38 +17,7 @@ * 48bit physical address space and embed it into 40bit. */ -#define IO_TLB_SHIFT_BACKUPS 12 -#define DMA_ATTR_FORCE_SWIOTLB (1UL << 10) -#define SWIOTLB_MAP_ERROR (~(phys_addr_t)0x0) -#define BOOTMEM_ALLOC_ANYWHERE (~(phys_addr_t)0) -#define IO_TLB_DEFAULT_SIZE_BACKUPS (4ULL << 30) -#define INVALID_PHYS_ADDR (~(phys_addr_t)0) -#define OFFSET(val, align) ((unsigned long) \ - ((val) & ((align) - 1))) -#define arch_dma_cache_sync NULL - -unsigned int max_segment_backups; -bool swiotlb_need_fix; -static DEFINE_SPINLOCK(io_tlb_lock_high); -static phys_addr_t io_tlb_backups_start, io_tlb_backups_end; -static phys_addr_t *io_tlb_orig_backups_addr; -static bool no_iotlb_backups_memory; static int node_id_offset; -static unsigned int *io_tlb_backups_list; -static unsigned long io_tlb_nslabs_backups; - -static phys_addr_t map_single_loongson(struct device *hwdev, phys_addr_t phys, size_t size, - enum dma_data_direction dir, unsigned long attrs); -static phys_addr_t map_single_copy(struct device *hwdev, phys_addr_t phys, size_t size, - enum dma_data_direction dir, unsigned long attrs); - -static inline bool sme_active(void) { return false; } - -void arch_setup_dma_ops(struct device *dev, u64 dma_base, - u64 size, const struct iommu_ops *iommu, bool coherent) -{ - -} dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { @@ -66,839 +33,8 @@ phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr) return ((nid << node_id_offset) ^ daddr) | (nid << 44); } -static inline void *dma_to_virt(struct device *dev, dma_addr_t dma_addr) -{ - return phys_to_virt(dma_to_phys(dev, dma_addr)); -} - -void swiotlb_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_addr, unsigned long attrs) -{ - dma_direct_free(dev, size, vaddr, dma_addr, attrs); -} - -static void *loongson_dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) -{ - void *ret = dma_direct_alloc(dev, size, dma_handle, gfp, attrs); - return ret; -} - -static void loongson_dma_free_coherent(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle, unsigned long attrs) -{ - swiotlb_free(dev, size, vaddr, dma_handle, attrs); -} - -static int loongson_dma_mmap(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) -{ - int ret = -ENXIO; - unsigned long user_count = vma_pages(vma); - unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; - unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); - unsigned long off = vma->vm_pgoff; - - unsigned long prot = pgprot_val(vma->vm_page_prot); - - prot = (prot & ~_CACHE_MASK) | _CACHE_CC; - vma->vm_page_prot = __pgprot(prot); - - if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) - return ret; - - if (off < count && user_count <= (count - off)) { - ret = remap_pfn_range(vma, vma->vm_start, pfn + off, - user_count << PAGE_SHIFT, vma->vm_page_prot); - } - - return ret; -} - -static void swiotlb_bounce_loongson(phys_addr_t orig_addr, phys_addr_t tlb_addr, - size_t size, enum dma_data_direction dir) -{ - unsigned long pfn = PFN_DOWN(orig_addr); - unsigned char *vaddr = phys_to_virt(tlb_addr); - - if (PageHighMem(pfn_to_page(pfn))) { - /* The buffer does not have a mapping. Map it in and copy */ - unsigned int offset = orig_addr & ~PAGE_MASK; - char *buffer; - unsigned int sz = 0; - unsigned long flags; - - while (size) { - sz = min_t(size_t, PAGE_SIZE - offset, size); - - local_irq_save(flags); - buffer = kmap_atomic(pfn_to_page(pfn)); - if (dir == DMA_TO_DEVICE) - memcpy(vaddr, buffer + offset, sz); - else - memcpy(buffer + offset, vaddr, sz); - kunmap_atomic(buffer); - local_irq_restore(flags); - - size -= sz; - pfn++; - vaddr += sz; - offset = 0; - } - } else if (dir == DMA_TO_DEVICE) { - memcpy(vaddr, phys_to_virt(orig_addr), size); - } else { - memcpy(phys_to_virt(orig_addr), vaddr, size); - } -} - -void swiotlb_tbl_unmap_single_loongson(struct device *hwdev, phys_addr_t tlb_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - unsigned long flags; - int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT_BACKUPS) >> IO_TLB_SHIFT_BACKUPS; - int index = (tlb_addr - io_tlb_backups_start) >> IO_TLB_SHIFT_BACKUPS; - phys_addr_t orig_addr = io_tlb_orig_backups_addr[index]; - - /* - * First, sync the memory before unmapping the entry - */ - if (orig_addr != INVALID_PHYS_ADDR && - !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && - ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) - swiotlb_bounce_loongson(orig_addr, tlb_addr, size, DMA_FROM_DEVICE); - - /* - * Return the buffer to the free list by setting the corresponding - * entries to indicate the number of contiguous entries available. - * While returning the entries to the free list, we merge the entries - * with slots below and above the pool being returned. - */ - spin_lock_irqsave(&io_tlb_lock_high, flags); - { - count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ? - io_tlb_backups_list[index + nslots] : 0); - /* - * Step 1: return the slots to the free list, merging the - * slots with superceeding slots - */ - for (i = index + nslots - 1; i >= index; i--) { - io_tlb_backups_list[i] = ++count; - io_tlb_orig_backups_addr[i] = INVALID_PHYS_ADDR; - } - /* - * Step 2: merge the returned slots with the preceding slots, - * if available (non zero) - */ - for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) - && io_tlb_backups_list[i]; i--) - io_tlb_backups_list[i] = ++count; - } - spin_unlock_irqrestore(&io_tlb_lock_high, flags); -} - -/* - * Map a single buffer of the indicated size for DMA in streaming mode. The - * physical address to use is returned. - * - * Once the device is given the dma address, the device owns this memory until - * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. - */ -dma_addr_t swiotlb_map_page_loongson(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - phys_addr_t map, phys = page_to_phys(page) + offset; - dma_addr_t dev_addr = phys_to_dma(dev, phys); - - WARN_ON(dir == DMA_NONE); - - /* Oh well, have to allocate and map a bounce buffer. */ - map = map_single_loongson(dev, phys, size, dir, attrs); - if (map == SWIOTLB_MAP_ERROR) - return DMA_MAPPING_ERROR; - - dev_addr = phys_to_dma(dev, map); - - /* Ensure that the address returned is DMA'ble */ - if (dma_capable(dev, dev_addr, size, true)) - return dev_addr; - - attrs |= DMA_ATTR_SKIP_CPU_SYNC; - swiotlb_tbl_unmap_single_loongson(dev, map, size, dir, attrs); - - return DMA_MAPPING_ERROR; -} - -/* - * Allocates bounce buffer and returns its physical address. - */ -static phys_addr_t -map_single(struct device *hwdev, phys_addr_t phys, size_t size, - enum dma_data_direction dir, unsigned long attrs) -{ - dma_addr_t start_dma_addr; - - if (swiotlb_force == SWIOTLB_NO_FORCE) { - dev_warn_ratelimited(hwdev, "Cannot do DMA to address %pa\n", - &phys); - return SWIOTLB_MAP_ERROR; - } - - start_dma_addr = phys_to_dma(hwdev, io_tlb_start); - return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, - dir, attrs); -} - -/* - * Map a single buffer of the indicated size for DMA in streaming mode. The - * physical address to use is returned. - * - * Once the device is given the dma address, the device owns this memory until - * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. - */ -dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - phys_addr_t map, phys = page_to_phys(page) + offset; - dma_addr_t dev_addr = phys_to_dma(dev, phys); - int dev_swiotlb_force = attrs & DMA_ATTR_FORCE_SWIOTLB; - - WARN_ON(dir == DMA_NONE); - /* - * If the address happens to be in the device's DMA window, - * we can safely return the device addr and not worry about bounce - * buffering it. - */ - if (dma_capable(dev, dev_addr, size, true) && - swiotlb_force != SWIOTLB_FORCE && !dev_swiotlb_force) - return dev_addr; - - /* Oh well, have to allocate and map a bounce buffer. */ - map = map_single(dev, phys, size, dir, attrs); - if (map == SWIOTLB_MAP_ERROR) - return DMA_MAPPING_ERROR; - - dev_addr = phys_to_dma(dev, map); - - /* Ensure that the address returned is DMA'ble */ - if (dma_capable(dev, dev_addr, size, true)) - return dev_addr; - - attrs |= DMA_ATTR_SKIP_CPU_SYNC; - swiotlb_tbl_unmap_single(dev, map, size, size, dir, attrs); - - return DMA_MAPPING_ERROR; -} - -static dma_addr_t loongson_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - dma_addr_t daddr; - - phys_addr_t phys = page_to_phys(page) + offset; - - /* check if phys addr is on Node 4,5,6,7 and need swiotlb fix */ - if ((phys & (0x4ULL << 44)) && swiotlb_need_fix) - daddr = swiotlb_map_page_loongson(dev, page, offset, size, dir, attrs); - else - daddr = swiotlb_map_page(dev, page, offset, size, dir, attrs); - return daddr; -} - -int is_swiotlb_backups_buffer(phys_addr_t paddr) -{ - return paddr >= io_tlb_backups_start && paddr < io_tlb_backups_end; -} - -static void unmap_single_loongson(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - - WARN_ON(dir == DMA_NONE); - - if (is_swiotlb_buffer(paddr)) { - swiotlb_tbl_unmap_single(hwdev, paddr, size, size, dir, attrs); - return; - } - - if (is_swiotlb_backups_buffer(paddr)) { - swiotlb_tbl_unmap_single_loongson(hwdev, paddr, size, dir, attrs); - return; - } - if (dir != DMA_FROM_DEVICE) - return; -} - -static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - - WARN_ON(dir == DMA_NONE); - - if (is_swiotlb_buffer(paddr)) { - swiotlb_tbl_unmap_single(hwdev, paddr, size, size, dir, attrs); - return; - } - - if (dir != DMA_FROM_DEVICE) - return; -} - -void swiotlb_unmap_page_loongson(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - unmap_single_loongson(hwdev, dev_addr, size, dir, attrs); -} - -static void loongson_dma_unmap_page(struct device *dev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - swiotlb_unmap_page_loongson(dev, dev_addr, size, dir, attrs); -} - -static unsigned int io_tlb_backups_index; -phys_addr_t swiotlb_tbl_map_single_loongson(struct device *hwdev, - dma_addr_t tbl_dma_addr, - phys_addr_t orig_addr, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - unsigned long flags; - phys_addr_t tlb_addr; - unsigned int nslots, stride, index, wrap; - int i; - unsigned long mask; - unsigned long offset_slots; - unsigned long max_slots; - - if (no_iotlb_backups_memory) - panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer"); - - if (mem_encrypt_active()) - pr_warn_once("%s is active and system is using DMA bounce buffers\n", - sme_active() ? "SME" : "SEV"); - - mask = dma_get_seg_boundary(hwdev); - - tbl_dma_addr &= mask; - - offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT_BACKUPS) >> IO_TLB_SHIFT_BACKUPS; - - /* - * Carefully handle integer overflow which can occur when mask == ~0UL. - */ - max_slots = mask + 1 - ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT_BACKUPS) >> IO_TLB_SHIFT_BACKUPS - : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT_BACKUPS); - - /* - * For mappings greater than or equal to a page, we limit the stride - * (and hence alignment) to a page size. - */ - nslots = ALIGN(size, 1 << IO_TLB_SHIFT_BACKUPS) >> IO_TLB_SHIFT_BACKUPS; - if (size >= PAGE_SIZE) - stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT_BACKUPS)); - else - stride = 1; - - WARN_ON(!nslots); - - /* - * Find suitable number of IO TLB entries size that will fit this - * request and allocate a buffer from that IO TLB pool. - */ - spin_lock_irqsave(&io_tlb_lock_high, flags); - index = ALIGN(io_tlb_backups_index, stride); - if (index >= io_tlb_nslabs_backups) - index = 0; - wrap = index; - - do { - while (iommu_is_span_boundary(index, nslots, offset_slots, - max_slots)) { - index += stride; - if (index >= io_tlb_nslabs_backups) - index = 0; - if (index == wrap) - goto not_found; - } - - /* - * If we find a slot that indicates we have 'nslots' number of - * contiguous buffers, we allocate the buffers from that slot - * and mark the entries as '0' indicating unavailable. - */ - if (io_tlb_backups_list[index] >= nslots) { - int count = 0; - - for (i = index; i < (int) (index + nslots); i++) - io_tlb_backups_list[i] = 0; - for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) - && io_tlb_backups_list[i]; i--) - io_tlb_backups_list[i] = ++count; - tlb_addr = io_tlb_backups_start + (index << IO_TLB_SHIFT_BACKUPS); - - /* - * Update the indices to avoid searching in the next - * round. - */ - io_tlb_backups_index = ((index + nslots) < io_tlb_nslabs_backups - ? (index + nslots) : 0); - - goto found; - } - index += stride; - if (index >= io_tlb_nslabs_backups) - index = 0; - } while (index != wrap); - -not_found: - spin_unlock_irqrestore(&io_tlb_lock_high, flags); - if (!(attrs & DMA_ATTR_NO_WARN)) - dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size); - return SWIOTLB_MAP_ERROR; -found: - spin_unlock_irqrestore(&io_tlb_lock_high, flags); - - /* - * Save away the mapping from the original address to the DMA address. - * This is needed when we sync the memory. Then we sync the buffer if - * needed. - */ - for (i = 0; i < nslots; i++) - io_tlb_orig_backups_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT_BACKUPS); - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) && - (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) - swiotlb_bounce_loongson(orig_addr, tlb_addr, size, DMA_TO_DEVICE); - - return tlb_addr; -} - -static phys_addr_t map_single_copy(struct device *hwdev, phys_addr_t phys, size_t size, - enum dma_data_direction dir, unsigned long attrs) -{ - dma_addr_t start_dma_addr; - - if (swiotlb_force == SWIOTLB_NO_FORCE) { - dev_warn_ratelimited(hwdev, "Cannot do DMA to address %pa\n", - &phys); - return SWIOTLB_MAP_ERROR; - } - - start_dma_addr = phys_to_dma(hwdev, io_tlb_start); - return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, - dir, attrs); -} - -/* - * Allocates bounce buffer and returns its physical address. - */ -static phys_addr_t map_single_loongson(struct device *hwdev, phys_addr_t phys, size_t size, - enum dma_data_direction dir, unsigned long attrs) -{ - dma_addr_t start_dma_addr; - - if (swiotlb_force == SWIOTLB_NO_FORCE) { - dev_warn_ratelimited(hwdev, "Cannot do DMA to address %pa\n", - &phys); - return SWIOTLB_MAP_ERROR; - } - - start_dma_addr = phys_to_dma(hwdev, io_tlb_backups_start); - return swiotlb_tbl_map_single_loongson(hwdev, start_dma_addr, phys, size, - dir, attrs); -} - -void swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, - int nelems, enum dma_data_direction dir, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - WARN_ON(dir == DMA_NONE); - - for_each_sg(sgl, sg, nelems, i) - unmap_single(hwdev, sg->dma_address, sg_dma_len(sg), dir, - attrs); -} - -int swiotlb_map_sg_attrs_loongson(struct device *hwdev, struct scatterlist *sgl, int nelems, - enum dma_data_direction dir, unsigned long attrs) -{ - struct scatterlist *sg; - int i, dev_swiotlb_force = attrs & DMA_ATTR_FORCE_SWIOTLB; - - WARN_ON(dir == DMA_NONE); - - for_each_sg(sgl, sg, nelems, i) { - phys_addr_t paddr = sg_phys(sg); - dma_addr_t dev_addr = phys_to_dma(hwdev, paddr); - - if (swiotlb_force == SWIOTLB_FORCE || dev_swiotlb_force || - !dma_capable(hwdev, dev_addr, sg->length, true)) { - phys_addr_t map = map_single_copy(hwdev, sg_phys(sg), - sg->length, dir, attrs); - if (map == SWIOTLB_MAP_ERROR) { - /* - * Don't panic here, we expect map_sg users - * to do proper error handling. - */ - attrs |= DMA_ATTR_SKIP_CPU_SYNC; - swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, - attrs); - sg_dma_len(sgl) = 0; - return 0; - } - sg->dma_address = phys_to_dma(hwdev, map); - } else if (paddr & (0x4ULL << 44) && swiotlb_need_fix) { - phys_addr_t map = map_single_loongson(hwdev, sg_phys(sg), - sg->length, dir, attrs); - if (map == SWIOTLB_MAP_ERROR) { - /* - * Don't panic here, we expect map_sg users - * to do proper error handling. - */ - attrs |= DMA_ATTR_SKIP_CPU_SYNC; - swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, - attrs); - sg_dma_len(sgl) = 0; - return 0; - } - sg->dma_address = phys_to_dma(hwdev, map); - } else { - sg->dma_address = dev_addr; - } - sg_dma_len(sg) = sg->length; - } - return nelems; -} - -static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sgl, - int nents, enum dma_data_direction dir, - unsigned long attrs) -{ - int r; - - r = swiotlb_map_sg_attrs_loongson(dev, sgl, nents, dir, attrs); - return r; -} - -void swiotlb_unmap_sg_attrs_loongson(struct device *hwdev, struct scatterlist *sgl, - int nelems, enum dma_data_direction dir, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - WARN_ON(dir == DMA_NONE); - - for_each_sg(sgl, sg, nelems, i) - unmap_single_loongson(hwdev, sg->dma_address, sg_dma_len(sg), dir, - attrs); -} - -static void loongson_dma_unmap_sg(struct device *dev, struct scatterlist *sgl, - int nelems, enum dma_data_direction dir, - unsigned long attrs) -{ - swiotlb_unmap_sg_attrs_loongson(dev, sgl, nelems, dir, attrs); -} - -void swiotlb_tbl_sync_single_loongson(struct device *hwdev, phys_addr_t tlb_addr, - size_t size, enum dma_data_direction dir, - enum dma_sync_target target) -{ - int index = (tlb_addr - io_tlb_backups_start) >> IO_TLB_SHIFT_BACKUPS; - phys_addr_t orig_addr = io_tlb_orig_backups_addr[index]; - - if (orig_addr == INVALID_PHYS_ADDR) - return; - orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT_BACKUPS) - 1); - - switch (target) { - case SYNC_FOR_CPU: - if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) - swiotlb_bounce_loongson(orig_addr, tlb_addr, - size, DMA_FROM_DEVICE); - else - WARN_ON(dir != DMA_TO_DEVICE); - break; - case SYNC_FOR_DEVICE: - if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) - swiotlb_bounce_loongson(orig_addr, tlb_addr, - size, DMA_TO_DEVICE); - else - WARN_ON(dir != DMA_FROM_DEVICE); - break; - default: - WARN(1, "bug"); - } -} - -static void swiotlb_sync_single_loongson(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - enum dma_sync_target target) -{ - phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - - WARN_ON(dir == DMA_NONE); - - if (is_swiotlb_buffer(paddr)) { - swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target); - return; - } - - if (is_swiotlb_backups_buffer(paddr)) { - swiotlb_tbl_sync_single_loongson(hwdev, paddr, size, dir, target); - return; - } - if (dir != DMA_FROM_DEVICE) - return; -} - -static void swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - enum dma_sync_target target) -{ - phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - - WARN_ON(dir == DMA_NONE); - - if (is_swiotlb_buffer(paddr)) { - swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target); - return; - } - - if (dir != DMA_FROM_DEVICE) - return; -} - -void swiotlb_sync_single_for_cpu_loongson(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir) -{ - swiotlb_sync_single_loongson(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); -} - -void swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir) -{ - swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); -} - -static void loongson_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir) -{ - /* use dma address directly since dma addr == phy addr for swiotlb */ - if (is_swiotlb_buffer(dev_addr)) - swiotlb_sync_single_for_cpu(dev, dev_addr, size, dir); - if (is_swiotlb_backups_buffer(dev_addr)) - swiotlb_sync_single_for_cpu_loongson(dev, dev_addr, size, dir); -} - -void swiotlb_sync_single_for_device_loongson(struct device *hwdev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir) -{ - swiotlb_sync_single_loongson(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); -} - -static void loongson_dma_sync_single_for_device(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction dir) -{ - swiotlb_sync_single_for_device_loongson(dev, dma_handle, size, dir); - /* - * There maybe exist write-buffer, device can not get cpu's write buffer - * need flush data from write-buffer to cache - */ - mb(); -} -static void swiotlb_sync_sg_loongson(struct device *hwdev, struct scatterlist *sgl, - int nelems, enum dma_data_direction dir, - enum dma_sync_target target) -{ - struct scatterlist *sg; - int i; - - for_each_sg(sgl, sg, nelems, i) - swiotlb_sync_single_loongson(hwdev, sg->dma_address, - sg_dma_len(sg), dir, target); -} - -void swiotlb_sync_sg_for_cpu_loongson(struct device *hwdev, struct scatterlist *sg, - int nelems, enum dma_data_direction dir) -{ - swiotlb_sync_sg_loongson(hwdev, sg, nelems, dir, SYNC_FOR_CPU); -} - -static void loongson_dma_sync_sg_for_cpu(struct device *dev, - struct scatterlist *sgl, int nents, - enum dma_data_direction dir) -{ - swiotlb_sync_sg_for_cpu_loongson(dev, sgl, nents, dir); -} - -void swiotlb_sync_sg_for_device_loongson(struct device *hwdev, struct scatterlist *sg, - int nelems, enum dma_data_direction dir) -{ - swiotlb_sync_sg_loongson(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); -} - -static void loongson_dma_sync_sg_for_device(struct device *dev, - struct scatterlist *sgl, int nents, - enum dma_data_direction dir) -{ - swiotlb_sync_sg_for_device_loongson(dev, sgl, nents, dir); - /* - * There maybe exist write-buffer, device can not get cpu's write buffer - * need flush data from write-buffer to cache - */ - mb(); -} - -static int loongson_dma_supported(struct device *dev, u64 mask) -{ - return dma_direct_supported(dev, mask); -} - -const struct dma_map_ops loongson_dma_ops = { - .alloc = loongson_dma_alloc_coherent, - .free = loongson_dma_free_coherent, - .mmap = loongson_dma_mmap, - .map_page = loongson_dma_map_page, - .unmap_page = loongson_dma_unmap_page, - .map_sg = loongson_dma_map_sg, - .unmap_sg = loongson_dma_unmap_sg, - .sync_single_for_cpu = loongson_dma_sync_single_for_cpu, - .sync_single_for_device = loongson_dma_sync_single_for_device, - .sync_sg_for_cpu = loongson_dma_sync_sg_for_cpu, - .sync_sg_for_device = loongson_dma_sync_sg_for_device, - .dma_supported = loongson_dma_supported, - .cache_sync = arch_dma_cache_sync, -}; -EXPORT_SYMBOL(loongson_dma_ops); - -static inline void * __init memblock_alloc_high( - phys_addr_t size, phys_addr_t align) -{ - return memblock_alloc_try_nid(size, align, ARCH_LOW_ADDRESS_LIMIT, - BOOTMEM_ALLOC_ANYWHERE, - NUMA_NO_NODE); -} - -void swiotlb_print_info_loongson(void) -{ - unsigned long bytes = io_tlb_nslabs_backups << IO_TLB_SHIFT_BACKUPS; - - if (no_iotlb_backups_memory) { - pr_warn("No low mem\n"); - return; - } - - pr_info("mapped [mem %#010llx-%#010llx] (%luMB)\n", - (unsigned long long)io_tlb_backups_start, - (unsigned long long)io_tlb_backups_end, - bytes >> 20); -} - -void swiotlb_set_max_segment_loongson(unsigned int val) -{ - if (swiotlb_force == SWIOTLB_FORCE) - max_segment_backups = 1; - else - max_segment_backups = rounddown(val, PAGE_SIZE); -} - -int __init swiotlb_init_with_tbl_backups(char *tlb, unsigned long nslabs, int verbose) -{ - size_t alloc_size; - unsigned long i, bytes; - - bytes = nslabs << IO_TLB_SHIFT_BACKUPS; - - io_tlb_nslabs_backups = nslabs; - io_tlb_backups_start = __pa(tlb); - io_tlb_backups_end = io_tlb_backups_start + bytes; - - /* - * Allocate and initialize the free list array. This array is used - * to find contiguous free memory regions of size up to IO_TLB_SEGSIZE - * between io_tlb_backups_start and io_tlb_backups_end. - */ - alloc_size = PAGE_ALIGN(io_tlb_nslabs_backups * sizeof(int)); - io_tlb_backups_list = memblock_alloc(alloc_size, PAGE_SIZE); - if (!io_tlb_backups_list) - panic("%s: Failed to allocate %zu bytes align=0x%lx\n", - __func__, alloc_size, PAGE_SIZE); - - alloc_size = PAGE_ALIGN(io_tlb_nslabs_backups * sizeof(phys_addr_t)); - io_tlb_orig_backups_addr = memblock_alloc(alloc_size, PAGE_SIZE); - if (!io_tlb_orig_backups_addr) - panic("%s: Failed to allocate %zu bytes align=0x%lx\n", - __func__, alloc_size, PAGE_SIZE); - - for (i = 0; i < io_tlb_nslabs_backups; i++) { - io_tlb_backups_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); - io_tlb_orig_backups_addr[i] = INVALID_PHYS_ADDR; - } - io_tlb_backups_index = 0; - - no_iotlb_backups_memory = false; - - if (verbose) - swiotlb_print_info_loongson(); - - swiotlb_set_max_segment_loongson(io_tlb_nslabs_backups << IO_TLB_SHIFT_BACKUPS); - return 0; -} - -void __init swiotlb_init_backups(int verbose) -{ - size_t default_size = IO_TLB_DEFAULT_SIZE_BACKUPS; - unsigned char *vstart; - unsigned long bytes; - - if ((!strcmp(__cpu_full_name[0], "Loongson-3D5000")) && loongson_sysconf.nr_nodes > 4) - swiotlb_need_fix = 1; - - if (!io_tlb_nslabs_backups) { - io_tlb_nslabs_backups = (default_size >> IO_TLB_SHIFT_BACKUPS); - io_tlb_nslabs_backups = ALIGN(io_tlb_nslabs_backups, IO_TLB_SEGSIZE); - } - - bytes = io_tlb_nslabs_backups << IO_TLB_SHIFT_BACKUPS; - - /* Get IO TLB memory from the high pages */ - vstart = memblock_alloc_high(PAGE_ALIGN(bytes), PAGE_SIZE); - if (vstart && !swiotlb_init_with_tbl_backups(vstart, io_tlb_nslabs_backups, verbose)) - return; - - if (io_tlb_backups_start) { - memblock_free_early(io_tlb_backups_start, - PAGE_ALIGN(io_tlb_nslabs_backups << IO_TLB_SHIFT_BACKUPS)); - io_tlb_backups_start = 0; - } - pr_warn("Cannot allocate buffer"); - no_iotlb_backups_memory = true; -} - void __init plat_swiotlb_setup(void) { swiotlb_init(true); - swiotlb_init_backups(1); - node_id_offset = ((readl(LS7A_DMA_CFG) & LS7A_DMA_NODE_MASK) >> LS7A_DMA_NODE_SHF) + 36; }