habanalabs: make use of dma_mmap_coherent

Add dma_mmap_coherent() for goya and gaudi to match their use of
dma_alloc_coherent(), see the Link tag for why.

Link: https://lore.kernel.org/lkml/20200609091727.GA23814@lst.de/
Cc: Christoph Hellwig <hch@lst.de>
Cc: Zhang Li <li.zhang@bitmain.com>
Cc: Ding Z Nan <oshack@hotmail.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/misc/habanalabs/common/command_buffer.c

@@ -300,7 +300,6 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
 {
 	struct hl_device *hdev = hpriv->hdev;
 	struct hl_cb *cb;
-	phys_addr_t address;
 	u32 handle, user_cb_size;
 	int rc;
 
@@ -360,12 +359,8 @@ int hl_cb_mmap(struct hl_fpriv *hpriv, struct vm_area_struct *vma)
 
 	vma->vm_private_data = cb;
 
-	/* Calculate address for CB */
-	address = virt_to_phys((void *) (uintptr_t) cb->kernel_address);
-
-	rc = hdev->asic_funcs->cb_mmap(hdev, vma, cb->kernel_address,
-					address, cb->size);
-
+	rc = hdev->asic_funcs->cb_mmap(hdev, vma, (void *) cb->kernel_address,
+					cb->bus_address, cb->size);
 	if (rc) {
 		spin_lock(&cb->lock);
 		cb->mmap = false;

drivers/misc/habanalabs/common/habanalabs.h

@@ -710,7 +710,7 @@ struct hl_asic_funcs {
 	int (*suspend)(struct hl_device *hdev);
 	int (*resume)(struct hl_device *hdev);
 	int (*cb_mmap)(struct hl_device *hdev, struct vm_area_struct *vma,
-			u64 kaddress, phys_addr_t paddress, u32 size);
+			void *cpu_addr, dma_addr_t dma_addr, size_t size);
 	void (*ring_doorbell)(struct hl_device *hdev, u32 hw_queue_id, u32 pi);
 	void (*pqe_write)(struct hl_device *hdev, __le64 *pqe,
 			struct hl_bd *bd);

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -3091,17 +3091,16 @@ static int gaudi_resume(struct hl_device *hdev)
 }
 
 static int gaudi_cb_mmap(struct hl_device *hdev, struct vm_area_struct *vma,
-		u64 kaddress, phys_addr_t paddress, u32 size)
+			void *cpu_addr, dma_addr_t dma_addr, size_t size)
 {
 	int rc;
 
 	vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP |
 			VM_DONTCOPY | VM_NORESERVE;
 
-	rc = remap_pfn_range(vma, vma->vm_start, paddress >> PAGE_SHIFT,
-				size, vma->vm_page_prot);
+	rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr, dma_addr, size);
 	if (rc)
-		dev_err(hdev->dev, "remap_pfn_range error %d", rc);
+		dev_err(hdev->dev, "dma_mmap_coherent error %d", rc);
 
 	return rc;
 }

drivers/misc/habanalabs/goya/goya.c

@@ -2661,17 +2661,16 @@ int goya_resume(struct hl_device *hdev)
 }
 
 static int goya_cb_mmap(struct hl_device *hdev, struct vm_area_struct *vma,
-		u64 kaddress, phys_addr_t paddress, u32 size)
+			void *cpu_addr, dma_addr_t dma_addr, size_t size)
 {
 	int rc;
 
 	vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP |
 			VM_DONTCOPY | VM_NORESERVE;
 
-	rc = remap_pfn_range(vma, vma->vm_start, paddress >> PAGE_SHIFT,
-				size, vma->vm_page_prot);
+	rc = dma_mmap_coherent(hdev->dev, vma, cpu_addr, dma_addr, size);
 	if (rc)
-		dev_err(hdev->dev, "remap_pfn_range error %d", rc);
+		dev_err(hdev->dev, "dma_mmap_coherent error %d", rc);
 
 	return rc;
 }