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Douglas AndersonandDanilo Krummrich
3e2c1e213a
In C, bitfields are not necessarily safe to modify from multiple threads without locking. Switch "dma_coherent" over to the "flags" field so modifications are safe. Cc: Christoph Hellwig <hch@lst.de> Reviewed-by: Rafael J. Wysocki (Intel) <rafael@kernel.org> Reviewed-by: Danilo Krummrich <dakr@kernel.org> Acked-by: Vinod Koul <vkoul@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://patch.msgid.link/20260406162231.v5.7.If839f6dde98979fce177f70c6c74689a1904ee76@changeid [ Since all DEV_FLAG_DMA_COHERENT accessors are exposed unconditionally, also drop the CONFIG guards around dev_assign_dma_coherent() in device_initialize() to ensure a correct default value. - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Catalin Marinas <catalin.marinas@arm.com>
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*/
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#include <linux/gfp.h>
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#include <linux/cache.h>
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#include <linux/dma-map-ops.h>
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#include <xen/xen.h>
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#include <asm/cacheflush.h>
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#include <asm/xen/xen-ops.h>
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void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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unsigned long start = (unsigned long)phys_to_virt(paddr);
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dcache_clean_poc_nosync(start, start + size);
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}
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void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
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enum dma_data_direction dir)
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{
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unsigned long start = (unsigned long)phys_to_virt(paddr);
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if (dir == DMA_TO_DEVICE)
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return;
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dcache_inval_poc_nosync(start, start + size);
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}
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void arch_dma_prep_coherent(struct page *page, size_t size)
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{
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unsigned long start = (unsigned long)page_address(page);
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dcache_clean_poc(start, start + size);
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}
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void arch_setup_dma_ops(struct device *dev, bool coherent)
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{
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int cls = cache_line_size_of_cpu();
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WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
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TAINT_CPU_OUT_OF_SPEC,
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"%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
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dev_driver_string(dev), dev_name(dev),
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ARCH_DMA_MINALIGN, cls);
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dev_assign_dma_coherent(dev, coherent);
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xen_setup_dma_ops(dev);
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}
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