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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/mips/mm/dma-noncoherent.c
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..
@@ -5,34 +5,13 @@
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  * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
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  */
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 #include <linux/dma-direct.h>
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-#include <linux/dma-noncoherent.h>
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-#include <linux/dma-contiguous.h>
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+#include <linux/dma-map-ops.h>
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 #include <linux/highmem.h>
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10
 
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 #include <asm/cache.h>
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 #include <asm/cpu-type.h>
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 #include <asm/dma-coherence.h>
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 #include <asm/io.h>
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-
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-#ifdef CONFIG_DMA_PERDEV_COHERENT
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-static inline int dev_is_coherent(struct device *dev)
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-{
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-	return dev->archdata.dma_coherent;
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-}
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-#else
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-static inline int dev_is_coherent(struct device *dev)
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-{
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-	switch (coherentio) {
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-	default:
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-	case IO_COHERENCE_DEFAULT:
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-		return hw_coherentio;
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-	case IO_COHERENCE_ENABLED:
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-		return 1;
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-	case IO_COHERENCE_DISABLED:
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-		return 0;
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-	}
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-}
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-#endif /* CONFIG_DMA_PERDEV_COHERENT */
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 /*
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  * The affected CPUs below in 'cpu_needs_post_dma_flush()' can speculatively
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@@ -47,15 +26,13 @@
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  * R10000 and R12000 are used in such systems, the SGI IP28 Indigo² rsp.
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  * SGI IP32 aka O2.
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  */
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-static inline bool cpu_needs_post_dma_flush(struct device *dev)
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+static inline bool cpu_needs_post_dma_flush(void)
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 {
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-	if (dev_is_coherent(dev))
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-		return false;
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-
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 	switch (boot_cpu_type()) {
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 	case CPU_R10000:
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 	case CPU_R12000:
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 	case CPU_BMIPS5000:
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+	case CPU_LOONGSON2EF:
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 		return true;
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 	default:
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 		/*
..
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@@ -67,81 +44,44 @@
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 	}
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 }
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46
 
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-void *arch_dma_alloc(struct device *dev, size_t size,
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-		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
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+void arch_dma_prep_coherent(struct page *page, size_t size)
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 {
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-	void *ret;
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-
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-	ret = dma_direct_alloc(dev, size, dma_handle, gfp, attrs);
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-	if (!ret)
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-		return NULL;
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-
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-	if (!dev_is_coherent(dev) && !(attrs & DMA_ATTR_NON_CONSISTENT)) {
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-		dma_cache_wback_inv((unsigned long) ret, size);
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-		ret = (void *)UNCAC_ADDR(ret);
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-	}
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-
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-	return ret;
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+	dma_cache_wback_inv((unsigned long)page_address(page), size);
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 }
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-void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
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-		dma_addr_t dma_addr, unsigned long attrs)
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+void *arch_dma_set_uncached(void *addr, size_t size)
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 {
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-	if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !dev_is_coherent(dev))
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-		cpu_addr = (void *)CAC_ADDR((unsigned long)cpu_addr);
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-	dma_direct_free(dev, size, cpu_addr, dma_addr, attrs);
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+	return (void *)(__pa(addr) + UNCAC_BASE);
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 }
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-int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
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-		void *cpu_addr, dma_addr_t dma_addr, size_t size,
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-		unsigned long attrs)
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-{
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-	unsigned long user_count = vma_pages(vma);
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-	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
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-	unsigned long addr = (unsigned long)cpu_addr;
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-	unsigned long off = vma->vm_pgoff;
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-	unsigned long pfn;
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-	int ret = -ENXIO;
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-
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-	if (!dev_is_coherent(dev))
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-		addr = CAC_ADDR(addr);
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-
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-	pfn = page_to_pfn(virt_to_page((void *)addr));
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-
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-	if (attrs & DMA_ATTR_WRITE_COMBINE)
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-		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
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-	else
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-		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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-
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-	if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
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-		return ret;
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-
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-	if (off < count && user_count <= (count - off)) {
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-		ret = remap_pfn_range(vma, vma->vm_start,
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-				      pfn + off,
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-				      user_count << PAGE_SHIFT,
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-				      vma->vm_page_prot);
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-	}
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-
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-	return ret;
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-}
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-
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-static inline void dma_sync_virt(void *addr, size_t size,
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+static inline void dma_sync_virt_for_device(void *addr, size_t size,
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 		enum dma_data_direction dir)
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 {
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 	switch (dir) {
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 	case DMA_TO_DEVICE:
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 		dma_cache_wback((unsigned long)addr, size);
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 		break;
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-
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 	case DMA_FROM_DEVICE:
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 		dma_cache_inv((unsigned long)addr, size);
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 		break;
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-
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 	case DMA_BIDIRECTIONAL:
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 		dma_cache_wback_inv((unsigned long)addr, size);
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 		break;
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+	default:
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+		BUG();
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+	}
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+}
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+static inline void dma_sync_virt_for_cpu(void *addr, size_t size,
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+		enum dma_data_direction dir)
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+{
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+	switch (dir) {
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+	case DMA_TO_DEVICE:
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+		break;
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+	case DMA_FROM_DEVICE:
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+	case DMA_BIDIRECTIONAL:
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+		dma_cache_inv((unsigned long)addr, size);
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+		break;
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 	default:
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 		BUG();
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 	}
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@@ -153,7 +93,7 @@
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  * configured then the bulk of this loop gets optimized out.
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  */
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 static inline void dma_sync_phys(phys_addr_t paddr, size_t size,
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-		enum dma_data_direction dir)
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+		enum dma_data_direction dir, bool for_device)
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 {
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 	struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
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 	unsigned long offset = paddr & ~PAGE_MASK;
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@@ -161,48 +101,45 @@
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101
 
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 	do {
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 		size_t len = left;
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+		void *addr;
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 		if (PageHighMem(page)) {
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-			void *addr;
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-
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-			if (offset + len > PAGE_SIZE) {
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-				if (offset >= PAGE_SIZE) {
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-					page += offset >> PAGE_SHIFT;
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-					offset &= ~PAGE_MASK;
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-				}
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+			if (offset + len > PAGE_SIZE)
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 				len = PAGE_SIZE - offset;
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-			}
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+		}
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-			addr = kmap_atomic(page);
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-			dma_sync_virt(addr + offset, len, dir);
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-			kunmap_atomic(addr);
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-		} else
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-			dma_sync_virt(page_address(page) + offset, size, dir);
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+		addr = kmap_atomic(page);
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+		if (for_device)
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+			dma_sync_virt_for_device(addr + offset, len, dir);
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+		else
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+			dma_sync_virt_for_cpu(addr + offset, len, dir);
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+		kunmap_atomic(addr);
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+
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 		offset = 0;
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 		page++;
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 		left -= len;
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 	} while (left);
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 }
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-void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
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-		size_t size, enum dma_data_direction dir)
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+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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+		enum dma_data_direction dir)
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 {
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-	if (!dev_is_coherent(dev))
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-		dma_sync_phys(paddr, size, dir);
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+	dma_sync_phys(paddr, size, dir, true);
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 }
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129
 
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-void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
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-		size_t size, enum dma_data_direction dir)
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+#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU
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+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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+		enum dma_data_direction dir)
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 {
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-	if (cpu_needs_post_dma_flush(dev))
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-		dma_sync_phys(paddr, size, dir);
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+	if (cpu_needs_post_dma_flush())
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+		dma_sync_phys(paddr, size, dir, false);
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136
 }
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+#endif
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-void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
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-		enum dma_data_direction direction)
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+#ifdef CONFIG_DMA_PERDEV_COHERENT
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+void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
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+		const struct iommu_ops *iommu, bool coherent)
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142
 {
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-	BUG_ON(direction == DMA_NONE);
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-
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-	if (!dev_is_coherent(dev))
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-		dma_sync_virt(vaddr, size, direction);
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+	dev->dma_coherent = coherent;
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144
 }
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+#endif