From ea08eeccae9297f7aabd2ef7f0c2517ac4549acc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:18:26 +0000
Subject: [PATCH] write in 30M
---
kernel/arch/sh/kernel/dma-coherent.c | 62 +++----------------------------
1 files changed, 6 insertions(+), 56 deletions(-)
diff --git a/kernel/arch/sh/kernel/dma-coherent.c b/kernel/arch/sh/kernel/dma-coherent.c
index a0021ee..6a44c0e 100644
--- a/kernel/arch/sh/kernel/dma-coherent.c
+++ b/kernel/arch/sh/kernel/dma-coherent.c
@@ -1,69 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2004 - 2007 Paul Mundt
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
*/
#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/dma-noncoherent.h>
-#include <linux/module.h>
+#include <linux/dma-map-ops.h>
#include <asm/cacheflush.h>
#include <asm/addrspace.h>
-void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
- gfp_t gfp, unsigned long attrs)
+void arch_dma_prep_coherent(struct page *page, size_t size)
{
- void *ret, *ret_nocache;
- int order = get_order(size);
-
- gfp |= __GFP_ZERO;
-
- ret = (void *)__get_free_pages(gfp, order);
- if (!ret)
- return NULL;
-
- /*
- * Pages from the page allocator may have data present in
- * cache. So flush the cache before using uncached memory.
- */
- arch_sync_dma_for_device(dev, virt_to_phys(ret), size,
- DMA_BIDIRECTIONAL);
-
- ret_nocache = (void __force *)ioremap_nocache(virt_to_phys(ret), size);
- if (!ret_nocache) {
- free_pages((unsigned long)ret, order);
- return NULL;
- }
-
- split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
-
- *dma_handle = virt_to_phys(ret);
- if (!WARN_ON(!dev))
- *dma_handle -= PFN_PHYS(dev->dma_pfn_offset);
-
- return ret_nocache;
+ __flush_purge_region(page_address(page), size);
}
-void arch_dma_free(struct device *dev, size_t size, void *vaddr,
- dma_addr_t dma_handle, unsigned long attrs)
-{
- int order = get_order(size);
- unsigned long pfn = (dma_handle >> PAGE_SHIFT);
- int k;
-
- if (!WARN_ON(!dev))
- pfn += dev->dma_pfn_offset;
-
- for (k = 0; k < (1 << order); k++)
- __free_pages(pfn_to_page(pfn + k), 0);
-
- iounmap(vaddr);
-}
-
-void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
- size_t size, enum dma_data_direction dir)
+void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir)
{
void *addr = sh_cacheop_vaddr(phys_to_virt(paddr));
--
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