Re: [PATCH v2 03/17] misc/habana: Stop using frame_vector helpers

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On 10/9/20 12:59 AM, Daniel Vetter wrote:
All we need are a pages array, pin_user_pages_fast can give us that
directly. Plus this avoids the entire raw pfn side of get_vaddr_frames.

Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: linux-samsung-soc@xxxxxxxxxxxxxxx
Cc: linux-media@xxxxxxxxxxxxxxx
Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Cc: Omer Shpigelman <oshpigelman@xxxxxxxxx>
Cc: Ofir Bitton <obitton@xxxxxxxxx>
Cc: Tomer Tayar <ttayar@xxxxxxxxx>
Cc: Moti Haimovski <mhaimovski@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Pawel Piskorski <ppiskorski@xxxxxxxxx>
--
v2: Use unpin_user_pages_dirty_lock (John)
---
  drivers/misc/habanalabs/Kconfig             |  1 -
  drivers/misc/habanalabs/common/habanalabs.h |  3 +-
  drivers/misc/habanalabs/common/memory.c     | 49 ++++++++-------------
  3 files changed, 20 insertions(+), 33 deletions(-)

Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>

thanks,
--
John Hubbard
NVIDIA


diff --git a/drivers/misc/habanalabs/Kconfig b/drivers/misc/habanalabs/Kconfig
index 8eb5d38c618e..2f04187f7167 100644
--- a/drivers/misc/habanalabs/Kconfig
+++ b/drivers/misc/habanalabs/Kconfig
@@ -6,7 +6,6 @@
  config HABANA_AI
  	tristate "HabanaAI accelerators (habanalabs)"
  	depends on PCI && HAS_IOMEM
-	select FRAME_VECTOR
  	select DMA_SHARED_BUFFER
  	select GENERIC_ALLOCATOR
  	select HWMON
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index edbd627b29d2..c1b3ad613b15 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -881,7 +881,8 @@ struct hl_ctx_mgr {
  struct hl_userptr {
  	enum vm_type_t		vm_type; /* must be first */
  	struct list_head	job_node;
-	struct frame_vector	*vec;
+	struct page		**pages;
+	unsigned int		npages;
  	struct sg_table		*sgt;
  	enum dma_data_direction dir;
  	struct list_head	debugfs_list;
diff --git a/drivers/misc/habanalabs/common/memory.c b/drivers/misc/habanalabs/common/memory.c
index 5ff4688683fd..327b64479f97 100644
--- a/drivers/misc/habanalabs/common/memory.c
+++ b/drivers/misc/habanalabs/common/memory.c
@@ -1281,45 +1281,41 @@ static int get_user_memory(struct hl_device *hdev, u64 addr, u64 size,
  		return -EFAULT;
  	}
- userptr->vec = frame_vector_create(npages);
-	if (!userptr->vec) {
+	userptr->pages = kvmalloc_array(npages, sizeof(*userptr->pages),
+					GFP_KERNEL);
+	if (!userptr->pages) {
  		dev_err(hdev->dev, "Failed to create frame vector\n");
  		return -ENOMEM;
  	}
- rc = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE,
-				userptr->vec);
+	rc = pin_user_pages_fast(start, npages, FOLL_FORCE | FOLL_WRITE,
+				 userptr->pages);
if (rc != npages) {
  		dev_err(hdev->dev,
  			"Failed to map host memory, user ptr probably wrong\n");
  		if (rc < 0)
-			goto destroy_framevec;
+			goto destroy_pages;
+		npages = rc;
  		rc = -EFAULT;
-		goto put_framevec;
-	}
-
-	if (frame_vector_to_pages(userptr->vec) < 0) {
-		dev_err(hdev->dev,
-			"Failed to translate frame vector to pages\n");
-		rc = -EFAULT;
-		goto put_framevec;
+		goto put_pages;
  	}
+	userptr->npages = npages;
rc = sg_alloc_table_from_pages(userptr->sgt,
-					frame_vector_pages(userptr->vec),
-					npages, offset, size, GFP_ATOMIC);
+				       userptr->pages,
+				       npages, offset, size, GFP_ATOMIC);
  	if (rc < 0) {
  		dev_err(hdev->dev, "failed to create SG table from pages\n");
-		goto put_framevec;
+		goto put_pages;
  	}
return 0; -put_framevec:
-	put_vaddr_frames(userptr->vec);
-destroy_framevec:
-	frame_vector_destroy(userptr->vec);
+put_pages:
+	unpin_user_pages(userptr->pages, npages);
+destroy_pages:
+	kvfree(userptr->pages);
  	return rc;
  }
@@ -1405,8 +1401,6 @@ int hl_pin_host_memory(struct hl_device *hdev, u64 addr, u64 size,
   */
  void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr)
  {
-	struct page **pages;
-
  	hl_debugfs_remove_userptr(hdev, userptr);
if (userptr->dma_mapped)
@@ -1414,15 +1408,8 @@ void hl_unpin_host_memory(struct hl_device *hdev, struct hl_userptr *userptr)
  							userptr->sgt->nents,
  							userptr->dir);
- pages = frame_vector_pages(userptr->vec);
-	if (!IS_ERR(pages)) {
-		int i;
-
-		for (i = 0; i < frame_vector_count(userptr->vec); i++)
-			set_page_dirty_lock(pages[i]);
-	}
-	put_vaddr_frames(userptr->vec);
-	frame_vector_destroy(userptr->vec);
+	unpin_user_pages_dirty_lock(userptr->pages, userptr->npages, true);
+	kvfree(userptr->pages);
list_del(&userptr->job_node);

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