linux-kernel - [PATCH 3/3] habanalabs: make use of dma_mmap

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Date:   Sat, 29 Aug 2020 17:43:52 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, SW_Drivers@...ana.ai
Cc:     Hillf Danton <hdanton@...a.com>, Christoph Hellwig <hch@....de>,
        Zhang Li <li.zhang@...main.com>,
        Ding Z Nan <oshack@...mail.com>
Subject: [PATCH 3/3] habanalabs: make use of dma_mmap_coherent

From: Hillf Danton <hdanton@...a.com>

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@....de>
Cc: Zhang Li <li.zhang@...main.com>
Cc: Ding Z Nan <oshack@...mail.com>
Signed-off-by: Hillf Danton <hdanton@...a.com>
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/common/command_buffer.c | 9 ++-------
 drivers/misc/habanalabs/common/habanalabs.h     | 2 +-
 drivers/misc/habanalabs/gaudi/gaudi.c           | 7 +++----
 drivers/misc/habanalabs/goya/goya.c             | 7 +++----
 4 files changed, 9 insertions(+), 16 deletions(-)

diff --git a/drivers/misc/habanalabs/common/command_buffer.c b/drivers/misc/habanalabs/common/command_buffer.c
index 6563e4dfe7b6..ba63cee74050 100644
--- a/drivers/misc/habanalabs/common/command_buffer.c
+++ b/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;
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index cdb7a672ed30..6ea8ae616cf4 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/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);
diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 084019788e11..bc7e7e3ba3a8 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/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;
 }
diff --git a/drivers/misc/habanalabs/goya/goya.c b/drivers/misc/habanalabs/goya/goya.c
index 88847eb1b472..94b7958ba5fb 100644
--- a/drivers/misc/habanalabs/goya/goya.c
+++ b/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;
 }
-- 
2.17.1