修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/sound/core/memalloc.c
..
..
@@ -1,78 +1,20 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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  *                   Takashi Iwai <tiwai@suse.de>
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  * 
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  *  Generic memory allocators
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- *
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- *
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- *   This program is free software; you can redistribute it and/or modify
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- *   it under the terms of the GNU General Public License as published by
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- *   the Free Software Foundation; either version 2 of the License, or
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- *   (at your option) any later version.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *   GNU General Public License for more details.
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- *
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- *   You should have received a copy of the GNU General Public License
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- *   along with this program; if not, write to the Free Software
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- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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- *
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  */
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8
 
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 #include <linux/slab.h>
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 #include <linux/mm.h>
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 #include <linux/dma-mapping.h>
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 #include <linux/genalloc.h>
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+#include <linux/vmalloc.h>
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+#ifdef CONFIG_X86
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+#include <asm/set_memory.h>
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+#endif
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 #include <sound/memalloc.h>
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-
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-/*
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- *
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- *  Generic memory allocators
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- *
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- */
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-
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-/**
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- * snd_malloc_pages - allocate pages with the given size
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- * @size: the size to allocate in bytes
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- * @gfp_flags: the allocation conditions, GFP_XXX
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- *
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- * Allocates the physically contiguous pages with the given size.
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- *
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- * Return: The pointer of the buffer, or %NULL if no enough memory.
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- */
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-void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
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-{
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-	int pg;
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-
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-	if (WARN_ON(!size))
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-		return NULL;
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-	if (WARN_ON(!gfp_flags))
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-		return NULL;
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-	gfp_flags |= __GFP_COMP;	/* compound page lets parts be mapped */
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-	pg = get_order(size);
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-	return (void *) __get_free_pages(gfp_flags, pg);
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-}
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-EXPORT_SYMBOL(snd_malloc_pages);
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-
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-/**
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- * snd_free_pages - release the pages
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- * @ptr: the buffer pointer to release
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- * @size: the allocated buffer size
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- *
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- * Releases the buffer allocated via snd_malloc_pages().
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- */
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-void snd_free_pages(void *ptr, size_t size)
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-{
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-	int pg;
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-
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-	if (ptr == NULL)
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-		return;
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-	pg = get_order(size);
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-	free_pages((unsigned long) ptr, pg);
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-}
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-EXPORT_SYMBOL(snd_free_pages);
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18
 
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 /*
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  *
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@@ -82,31 +24,32 @@
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24
 
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 #ifdef CONFIG_HAS_DMA
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 /* allocate the coherent DMA pages */
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-static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
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+static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size)
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 {
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-	int pg;
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 	gfp_t gfp_flags;
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-	if (WARN_ON(!dma))
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-		return NULL;
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-	pg = get_order(size);
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 	gfp_flags = GFP_KERNEL
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 		| __GFP_COMP	/* compound page lets parts be mapped */
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 		| __GFP_NORETRY /* don't trigger OOM-killer */
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 		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
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-	return dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
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+	dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
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+					gfp_flags);
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+#ifdef CONFIG_X86
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+	if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
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+		set_memory_wc((unsigned long)dmab->area,
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+			      PAGE_ALIGN(size) >> PAGE_SHIFT);
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+#endif
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 }
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43
 
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 /* free the coherent DMA pages */
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-static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
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-			       dma_addr_t dma)
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+static void snd_free_dev_pages(struct snd_dma_buffer *dmab)
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 {
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-	int pg;
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-
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-	if (ptr == NULL)
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-		return;
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-	pg = get_order(size);
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-	dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
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+#ifdef CONFIG_X86
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+	if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
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+		set_memory_wb((unsigned long)dmab->area,
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+			      PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
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+#endif
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+	dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
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 }
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 #ifdef CONFIG_GENERIC_ALLOCATOR
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@@ -134,7 +77,8 @@
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 	/* Assign the pool into private_data field */
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 	dmab->private_data = pool;
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-	dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
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+	dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,
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+					PAGE_SIZE);
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 }
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 /**
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@@ -157,6 +101,14 @@
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  *
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  */
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+static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
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+					  gfp_t default_gfp)
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+{
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+	if (!dev)
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+		return default_gfp;
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+	else
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+		return (__force gfp_t)(unsigned long)dev;
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+}
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 /**
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  * snd_dma_alloc_pages - allocate the buffer area according to the given type
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@@ -174,19 +126,28 @@
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 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
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 			struct snd_dma_buffer *dmab)
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 {
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+	gfp_t gfp;
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+
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 	if (WARN_ON(!size))
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 		return -ENXIO;
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 	if (WARN_ON(!dmab))
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 		return -ENXIO;
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+	size = PAGE_ALIGN(size);
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 	dmab->dev.type = type;
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 	dmab->dev.dev = device;
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 	dmab->bytes = 0;
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+	dmab->area = NULL;
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+	dmab->addr = 0;
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+	dmab->private_data = NULL;
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 	switch (type) {
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 	case SNDRV_DMA_TYPE_CONTINUOUS:
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-		dmab->area = snd_malloc_pages(size,
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-					(__force gfp_t)(unsigned long)device);
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-		dmab->addr = 0;
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+		gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
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+		dmab->area = alloc_pages_exact(size, gfp);
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+		break;
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+	case SNDRV_DMA_TYPE_VMALLOC:
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+		gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
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+		dmab->area = __vmalloc(size, gfp);
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 		break;
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 #ifdef CONFIG_HAS_DMA
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 #ifdef CONFIG_GENERIC_ALLOCATOR
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@@ -198,20 +159,21 @@
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 		 * so if we fail to malloc, try to fetch memory traditionally.
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 		 */
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 		dmab->dev.type = SNDRV_DMA_TYPE_DEV;
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+		fallthrough;
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 #endif /* CONFIG_GENERIC_ALLOCATOR */
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 	case SNDRV_DMA_TYPE_DEV:
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-		dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
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+	case SNDRV_DMA_TYPE_DEV_UC:
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+		snd_malloc_dev_pages(dmab, size);
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 		break;
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 #endif
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 #ifdef CONFIG_SND_DMA_SGBUF
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 	case SNDRV_DMA_TYPE_DEV_SG:
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+	case SNDRV_DMA_TYPE_DEV_UC_SG:
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 		snd_malloc_sgbuf_pages(device, size, dmab, NULL);
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 		break;
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 #endif
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 	default:
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 		pr_err("snd-malloc: invalid device type %d\n", type);
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-		dmab->area = NULL;
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-		dmab->addr = 0;
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 		return -ENXIO;
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 	}
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 	if (! dmab->area)
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@@ -266,7 +228,10 @@
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 {
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 	switch (dmab->dev.type) {
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 	case SNDRV_DMA_TYPE_CONTINUOUS:
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-		snd_free_pages(dmab->area, dmab->bytes);
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+		free_pages_exact(dmab->area, dmab->bytes);
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+		break;
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+	case SNDRV_DMA_TYPE_VMALLOC:
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+		vfree(dmab->area);
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 		break;
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 #ifdef CONFIG_HAS_DMA
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 #ifdef CONFIG_GENERIC_ALLOCATOR
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@@ -275,11 +240,13 @@
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 		break;
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 #endif /* CONFIG_GENERIC_ALLOCATOR */
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 	case SNDRV_DMA_TYPE_DEV:
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-		snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
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+	case SNDRV_DMA_TYPE_DEV_UC:
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+		snd_free_dev_pages(dmab);
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 		break;
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 #endif
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 #ifdef CONFIG_SND_DMA_SGBUF
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 	case SNDRV_DMA_TYPE_DEV_SG:
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+	case SNDRV_DMA_TYPE_DEV_UC_SG:
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 		snd_free_sgbuf_pages(dmab);
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 		break;
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 #endif