[RFC PATCH 13/19] fpga: dfl: afu: convert to use vm_account

[Alistair Popple <apopple@xxxxxxxxxx>]

To charge pinned pages against the pins cgroup drivers must use the
vm_account_pinned() functions which requires initialisation of a
struct vm_account. Convert the dfl-afu-region code to do this and
charge any pins to the pins cgroup.

Signed-off-by: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Wu Hao <hao.wu@xxxxxxxxx>
Cc: Tom Rix <trix@xxxxxxxxxx>
Cc: Moritz Fischer <mdf@xxxxxxxxxx>
Cc: Xu Yilun <yilun.xu@xxxxxxxxx>
Cc: linux-fpga@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 drivers/fpga/dfl-afu-dma-region.c | 11 ++++++++---
 drivers/fpga/dfl-afu.h            |  1 +
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/fpga/dfl-afu-dma-region.c b/drivers/fpga/dfl-afu-dma-region.c
index 02b60fd..3b99784 100644
--- a/drivers/fpga/dfl-afu-dma-region.c
+++ b/drivers/fpga/dfl-afu-dma-region.c
@@ -38,7 +38,7 @@ static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
 	struct device *dev = &pdata->dev->dev;
 	int ret, pinned;
 
-	ret = account_locked_vm(current->mm, npages, true);
+	ret = vm_account_pinned(&region->vm_account, npages);
 	if (ret)
 		return ret;
 
@@ -67,7 +67,7 @@ static int afu_dma_pin_pages(struct dfl_feature_platform_data *pdata,
 free_pages:
 	kfree(region->pages);
 unlock_vm:
-	account_locked_vm(current->mm, npages, false);
+	vm_unaccount_pinned(&region->vm_account, npages);
 	return ret;
 }
 
@@ -87,7 +87,7 @@ static void afu_dma_unpin_pages(struct dfl_feature_platform_data *pdata,
 
 	unpin_user_pages(region->pages, npages);
 	kfree(region->pages);
-	account_locked_vm(current->mm, npages, false);
+	vm_unaccount_pinned(&region->vm_account, npages);
 
 	dev_dbg(dev, "%ld pages unpinned\n", npages);
 }
@@ -223,6 +223,7 @@ void afu_dma_region_destroy(struct dfl_feature_platform_data *pdata)
 			afu_dma_unpin_pages(pdata, region);
 
 		node = rb_next(node);
+		vm_account_release(&region->vm_account);
 		kfree(region);
 	}
 }
@@ -322,6 +323,8 @@ int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
 	region->user_addr = user_addr;
 	region->length = length;
 
+	vm_account_init_current(&region->vm_account);
+
 	/* Pin the user memory region */
 	ret = afu_dma_pin_pages(pdata, region);
 	if (ret) {
@@ -365,6 +368,7 @@ int afu_dma_map_region(struct dfl_feature_platform_data *pdata,
 unpin_pages:
 	afu_dma_unpin_pages(pdata, region);
 free_region:
+	vm_account_release(&region->vm_account);
 	kfree(region);
 	return ret;
 }
@@ -399,6 +403,7 @@ int afu_dma_unmap_region(struct dfl_feature_platform_data *pdata, u64 iova)
 	dma_unmap_page(dfl_fpga_pdata_to_parent(pdata),
 		       region->iova, region->length, DMA_BIDIRECTIONAL);
 	afu_dma_unpin_pages(pdata, region);
+	vm_account_release(&region->vm_account);
 	kfree(region);
 
 	return 0;
diff --git a/drivers/fpga/dfl-afu.h b/drivers/fpga/dfl-afu.h
index e5020e2..b1554e0 100644
--- a/drivers/fpga/dfl-afu.h
+++ b/drivers/fpga/dfl-afu.h
@@ -51,6 +51,7 @@ struct dfl_afu_mmio_region {
  * @in_use: flag to indicate if this region is in_use.
  */
 struct dfl_afu_dma_region {
+	struct vm_account vm_account;
 	u64 user_addr;
 	u64 length;
 	u64 iova;
-- 
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