linux-2.6.33/dma_alloc_from_coherent() の履歴(No.2)

履歴一覧
差分を表示
現在との差分を表示
ソースを表示
linux-2.6.33/dma_alloc_from_coherent() へ行く。
- 1 (2013-07-12 (金) 09:53:28)
- 2 (2014-09-13 (土) 08:26:41)

参照元†

↑

説明†

パス: linux-2.6.33/include/asm-generic/dma-coherent.h

FIXME: これは何？
- 説明

↑

引数†

struct device *dev
- linux-2.6.33/device
ssize_t size
dma_addr_t *dma_handle
- linux-2.6.33/dma_addr_t
void **ret

↑

返り値†

↑

参考†

汎用の関数を利用するようにコンフィグを定義しているアーキテクチャは、 arm, mips, sh, x86 の一部に存在する。

arch/arm/configs/acs5k_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/acs5k_tiny_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/afeb9260_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/am3517_evm_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/bcmring_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/cm_t35_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/cm_x2xx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/cm_x300_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/colibri_pxa270_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/colibri_pxa300_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/corgi_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/cpu9260_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/cpu9g20_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/cpuat91_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/da8xx_omapl_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/davinci_all_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/dove_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/em_x270_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/ep93xx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/eseries_pxa_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/ezx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/h3600_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/h5000_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/htcherald_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/igep0020_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/iop33x_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/jornada720_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/kb9202_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/kirkwood_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/ks8695_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/magician_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mini2440_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mv78xx0_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mx1_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mx21_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mx27_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mx31pdk_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/mx3_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/n8x0_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/neocore926_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/nhk8815_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/nuc910_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/nuc950_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/nuc960_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap3_beagle_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap3_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap3_evm_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap3_pandora_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap3_touchbook_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap_3430sdp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap_3630sdp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap_4430sdp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap_ldp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap_zoom2_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/omap_zoom3_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/orion5x_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/overo_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/palmz72_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/pxa168_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/pxa3xx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/pxa910_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/realview-smp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/realview_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/rx51_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/s3c2410_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/s3c6400_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/s5pc100_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/shark_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/spitz_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/stmp378x_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/stmp37xx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/u300_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/u8500_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/viper_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/xcep_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/arm/configs/zeus_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/mips/configs/fuloong2e_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/mips/configs/ip27_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/mips/configs/lemote2f_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/mips/configs/rbtx49xx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/ap325rxa_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/cayman_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/dreamcast_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/ecovec24-romimage_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/ecovec24_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/edosk7705_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/edosk7760_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/espt_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/hp6xx_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/kfr2r09-romimage_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/kfr2r09_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/landisk_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/lboxre2_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/magicpanelr2_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/microdev_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/migor_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/polaris_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/r7780mp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/r7785rp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/rsk7201_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/rsk7203_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/rts7751r2d1_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/rts7751r2dplus_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sdk7780_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7206_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7343_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7619_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7705_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7712_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7721_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7722_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7724_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7750_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7751_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/se7780_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh03_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh7710voipgw_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh7724_generic_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh7763rdp_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh7770_generic_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh7785lcr_32bit_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/sh7785lcr_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/shmin_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/shx3_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/snapgear_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/systemh_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/titan_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/ul2_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/sh/configs/urquell_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y
arch/x86/configs/i386_defconfig:CONFIG_HAVE_GENERIC_DMA_COHERENT=y

↑

実装†

↑

ヘッダ†

#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT

- linux-2.6.33/CONFIG_HAVE_GENERIC_DMA_COHERENT

/*
 * These two functions are only for dma allocator.
 * Don't use them in device drivers.
 */
int dma_alloc_from_coherent(struct device *dev, ssize_t size,
				       dma_addr_t *dma_handle, void **ret);
(...中略...)
#else
#define dma_alloc_from_coherent(dev, size, handle, ret) (0)

何もせず、失敗を返す。

(...中略...)
#endif

↑

drivers/base/dma-coherent.c: CONFIG_HAVE_GENERIC_DMA_COHERENT が定義される場合†

/**
 * dma_alloc_from_coherent() - try to allocate memory from the per-device coherent area
 *
 * @dev:	device from which we allocate memory
 * @size:	size of requested memory area
 * @dma_handle:	This will be filled with the correct dma handle
 * @ret:	This pointer will be filled with the virtual address
 *		to allocated area.
 *
 * This function should be only called from per-arch dma_alloc_coherent()
 * to support allocation from per-device coherent memory pools.
 *
 * Returns 0 if dma_alloc_coherent should continue with allocating from
 * generic memory areas, or !0 if dma_alloc_coherent should return @ret.
 */
int dma_alloc_from_coherent(struct device *dev, ssize_t size,
				       dma_addr_t *dma_handle, void **ret)
{
	struct dma_coherent_mem *mem;
	int order = get_order(size);
	int pageno;

- linux-2.6.33/dma_coherent_mem

linux-2.6.33/get_order()

	if (!dev)
		return 0;
	mem = dev->dma_mem;
	if (!mem)
		return 0;

	*ret = NULL;

	if (unlikely(size > (mem->size << PAGE_SHIFT)))
		goto err;

- linux-2.6.33/PAGE_SHIFT

	pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
	if (unlikely(pageno < 0))
		goto err;

- linux-2.6.33/bitmap_find_free_region()

linux-2.6.33/unlikely()

	/*
	 * Memory was found in the per-device area.
	 */
	*dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
	*ret = mem->virt_base + (pageno << PAGE_SHIFT);
	memset(*ret, 0, size);

	return 1;

err:
	/*
	 * In the case where the allocation can not be satisfied from the
	 * per-device area, try to fall back to generic memory if the
	 * constraints allow it.
	 */
	return mem->flags & DMA_MEMORY_EXCLUSIVE;

- linux-2.6.33/DMA_MEMORY_EXCLUSIVE

}
EXPORT_SYMBOL(dma_alloc_from_coherent);

ライセンスに関係なくシンボルを公開する。
- linux-2.6.33/EXPORT_SYMBOL()

↑

include/asm-generic/dma-coherent.h: CONFIG_HAVE_GENERIC_DMA_COHERENT が定義されない場合†

#define dma_alloc_from_coherent(dev, size, handle, ret) (0)

何もせず、失敗を返す。

↑

linux-2.6.33/dma_alloc_from_coherent() の履歴(No.2)

参照元†

説明†

引数†

返り値†

参考†

実装†

ヘッダ†

drivers/base/dma-coherent.c: CONFIG_HAVE_GENERIC_DMA_COHERENT が定義される場合†

include/asm-generic/dma-coherent.h: CONFIG_HAVE_GENERIC_DMA_COHERENT が定義されない場合†

コメント†