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Commit 903192a5 authored by Swathi Sridhar's avatar Swathi Sridhar
Browse files

arm64: mm: Support setting removed_dma_ops in arch_setup_dma_ops 



Currently the removed_dma_ops are set only once for dev nodes
which are associated with a reserved-memory region (PIL devices)
in device_init and when the probe of these devices fail,
we end up calling dma_deconfigure which sets the dma_ops to NULL.
Eventually when the probe succeeds, since dma_ops was set to
NULL during probe failure, we end up setting dma_ops to
arm64_swiotlb_dma_ops. Hence in arch_setup_dma_ops, if the
dma_ops is NULL, check to see if there is a reserved memory
associated with the dev and if so set dma_ops to removed_dma_ops
such that the right callback functions are invoked.

Change-Id: Ibc1028391ba90cbdd5c5826022b5015d9e261c09
Signed-off-by: default avatarSwathi Sridhar <swatsrid@codeaurora.org>
parent b9c9dfe5

arch/arm64/mm/dma-mapping.c

+7 −2
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ 
#include <linux/iommu.h>

#include <linux/vmalloc.h>

#include <linux/swiotlb.h>

#include <linux/dma-removed.h>

#include <linux/pci.h>

#include <linux/io.h>
@@ -988,8 +989,12 @@ static void arm_iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size); 
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,

			const struct iommu_ops *iommu, bool coherent)

{

	if (!dev->dma_ops)

	if (!dev->dma_ops) {

		if (dev->removed_mem)

			set_dma_ops(dev, &removed_dma_ops);

		else

			dev->dma_ops = &arm64_swiotlb_dma_ops;

	}



	dev->archdata.dma_coherent = coherent;

	arm_iommu_setup_dma_ops(dev, dma_base, size);

include/linux/dma-removed.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __LINUX_DMA_REMOVED_H

#define __LINUX_DMA_REMOVED_H



extern const struct dma_map_ops removed_dma_ops;



#endif /*  __LINUX_DMA_REMOVED_H */