microblaze: Fix mmap for cache coherent memory

When running in non-cache coherent configuration the memory that was
allocated with dma_alloc_coherent() has a custom mapping and so there is no
1-to-1 relationship between the kernel virtual address and the PFN. This
means that virt_to_pfn() will not work correctly for those addresses and the
default mmap implementation in the form of dma_common_mmap() will map some
random, but not the requested, memory area.

Fix this by providing a custom mmap implementation that looks up the PFN
from the page table rather than using virt_to_pfn.

Signed-off-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Michal Simek <[e-mail]>

arch/microblaze/include/asm/pgtable.h

···
 void consistent_sync(void *vaddr, size_t size, int direction);
 void consistent_sync_page(struct page *page, unsigned long offset,
 	size_t size, int direction);
+unsigned long consistent_virt_to_pfn(void *vaddr);
 
 void setup_memory(void);
 #endif /* __ASSEMBLY__ */

arch/microblaze/kernel/dma.c

···
 			__dma_sync(sg->dma_address, sg->length, direction);
 }
 
+int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+			     void *cpu_addr, dma_addr_t handle, size_t size,
+			     struct dma_attrs *attrs)
+{
+#ifdef CONFIG_MMU
+	unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+	unsigned long off = vma->vm_pgoff;
+	unsigned long pfn;
+
+	if (off >= count || user_count > (count - off))
+		return -ENXIO;
+
+#ifdef NOT_COHERENT_CACHE
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+	pfn = consistent_virt_to_pfn(cpu_addr);
+#else
+	pfn = virt_to_pfn(cpu_addr);
+#endif
+	return remap_pfn_range(vma, vma->vm_start, pfn + off,
+			       vma->vm_end - vma->vm_start, vma->vm_page_prot);
+#else
+	return -ENXIO;
+#endif
+}
+
 struct dma_map_ops dma_direct_ops = {
 	.alloc		= dma_direct_alloc_coherent,
 	.free		= dma_direct_free_coherent,
+	.mmap		= dma_direct_mmap_coherent,
 	.map_sg		= dma_direct_map_sg,
 	.dma_supported	= dma_direct_dma_supported,
 	.map_page	= dma_direct_map_page,

arch/microblaze/mm/consistent.c

···
 }
 EXPORT_SYMBOL(consistent_alloc);
 
+#ifdef CONFIG_MMU
+static pte_t *consistent_virt_to_pte(void *vaddr)
+{
+	unsigned long addr = (unsigned long)vaddr;
+
+	return pte_offset_kernel(pmd_offset(pgd_offset_k(addr), addr), addr);
+}
+
+unsigned long consistent_virt_to_pfn(void *vaddr)
+{
+	pte_t *ptep = consistent_virt_to_pte(vaddr);
+
+	if (pte_none(*ptep) || !pte_present(*ptep))
+		return 0;
+
+	return pte_pfn(*ptep);
+}
+#endif
+
 /*
  * free page(s) as defined by the above mapping.
  */
···
 	} while (size -= PAGE_SIZE);
 #else
 	do {
-		pte_t *ptep;
+		pte_t *ptep = consistent_virt_to_pte(vaddr);
 		unsigned long pfn;
 
-		ptep = pte_offset_kernel(pmd_offset(pgd_offset_k(
-						(unsigned int)vaddr),
-					(unsigned int)vaddr),
-				(unsigned int)vaddr);
 		if (!pte_none(*ptep) && pte_present(*ptep)) {
 			pfn = pte_pfn(*ptep);
 			pte_clear(&init_mm, (unsigned int)vaddr, ptep);