[PATCH 2.6.21-rc4 03/15] dmaengine: add the async_tx api
async_tx is an api to describe a series of bulk memory transfers/transforms. When possible these transactions are carried out by asynchrounous dma engines. The api handles inter-transaction dependencies and hides dma channel management from the client. When a dma engine is not present the transaction is carried out via synchronous software routines. Xor operations are handled by async_tx, to this end xor.c is moved into drivers/dma and is changed to take an explicit destination address and a series of sources to match the hardware engine implementation. When CONFIG_DMA_ENGINE is not set the asynchrounous path is compiled away. Changelog: * fixed a leftover debug print * don't allow callbacks in async_interrupt_cond * fixed xor_block changes * fixed usage of ASYNC_TX_XOR_DROP_DEST * drop dma mapping methods, suggested by Chris Leech * printk warning fixups from Andrew Morton * don't use inline in C files, Adrian Bunk * select the API when MD is enabled Signed-off-by: Dan Williams <[EMAIL PROTECTED]> --- drivers/Makefile |1 drivers/dma/Kconfig | 15 + drivers/dma/Makefile |1 drivers/dma/async_tx.c | 905 ++ drivers/dma/xor.c| 153 drivers/md/Kconfig |3 drivers/md/Makefile |6 drivers/md/raid5.c | 52 +-- drivers/md/xor.c | 154 include/linux/async_tx.h | 180 + include/linux/raid/xor.h |5 11 files changed, 1286 insertions(+), 189 deletions(-) diff --git a/drivers/Makefile b/drivers/Makefile index 3a718f5..2e8de9e 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_I2C) += i2c/ obj-$(CONFIG_W1) += w1/ obj-$(CONFIG_HWMON)+= hwmon/ obj-$(CONFIG_PHONE)+= telephony/ +obj-$(CONFIG_ASYNC_TX_DMA) += dma/ obj-$(CONFIG_MD) += md/ obj-$(CONFIG_BT) += bluetooth/ obj-$(CONFIG_ISDN) += isdn/ diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 30d021d..292ddad 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -7,8 +7,8 @@ menu "DMA Engine support" config DMA_ENGINE bool "Support for DMA engines" ---help--- - DMA engines offload copy operations from the CPU to dedicated - hardware, allowing the copies to happen asynchronously. + DMA engines offload bulk memory operations from the CPU to dedicated + hardware, allowing the operations to happen asynchronously. comment "DMA Clients" @@ -22,6 +22,16 @@ config NET_DMA Since this is the main user of the DMA engine, it should be enabled; say Y here. +config ASYNC_TX_DMA + tristate "Asynchronous Bulk Memory Transfers/Transforms API" + ---help--- + This enables the async_tx management layer for dma engines. + Subsystems coded to this API will use offload engines for bulk + memory operations where present. Software implementations are + called when a dma engine is not present or fails to allocate + memory to carry out the transaction. + Current subsystems ported to async_tx: MD_RAID4,5 + comment "DMA Devices" config INTEL_IOATDMA @@ -30,5 +40,4 @@ config INTEL_IOATDMA default m ---help--- Enable support for the Intel(R) I/OAT DMA engine. - endmenu diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index bdcfdbd..6a99341 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_DMA_ENGINE) += dmaengine.o obj-$(CONFIG_NET_DMA) += iovlock.o obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o +obj-$(CONFIG_ASYNC_TX_DMA) += async_tx.o xor.o diff --git a/drivers/dma/async_tx.c b/drivers/dma/async_tx.c new file mode 100644 index 000..8f7e701 --- /dev/null +++ b/drivers/dma/async_tx.c @@ -0,0 +1,905 @@ +/* + * Copyright(c) 2006 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#include +#include +#include +#include +#include + +#define ASYNC_TX_DEBUG 0 +#define PRINTK(x...) ((void)(ASYNC_TX_DEBUG && printk(x))) + +#ifdef CONFIG_DMA_ENGINE +static
[PATCH 2.6.21-rc4 03/15] dmaengine: add the async_tx api
async_tx is an api to describe a series of bulk memory transfers/transforms. When possible these transactions are carried out by asynchrounous dma engines. The api handles inter-transaction dependencies and hides dma channel management from the client. When a dma engine is not present the transaction is carried out via synchronous software routines. Xor operations are handled by async_tx, to this end xor.c is moved into drivers/dma and is changed to take an explicit destination address and a series of sources to match the hardware engine implementation. When CONFIG_DMA_ENGINE is not set the asynchrounous path is compiled away. Changelog: * fixed a leftover debug print * don't allow callbacks in async_interrupt_cond * fixed xor_block changes * fixed usage of ASYNC_TX_XOR_DROP_DEST * drop dma mapping methods, suggested by Chris Leech * printk warning fixups from Andrew Morton * don't use inline in C files, Adrian Bunk * select the API when MD is enabled Signed-off-by: Dan Williams [EMAIL PROTECTED] --- drivers/Makefile |1 drivers/dma/Kconfig | 15 + drivers/dma/Makefile |1 drivers/dma/async_tx.c | 905 ++ drivers/dma/xor.c| 153 drivers/md/Kconfig |3 drivers/md/Makefile |6 drivers/md/raid5.c | 52 +-- drivers/md/xor.c | 154 include/linux/async_tx.h | 180 + include/linux/raid/xor.h |5 11 files changed, 1286 insertions(+), 189 deletions(-) diff --git a/drivers/Makefile b/drivers/Makefile index 3a718f5..2e8de9e 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_I2C) += i2c/ obj-$(CONFIG_W1) += w1/ obj-$(CONFIG_HWMON)+= hwmon/ obj-$(CONFIG_PHONE)+= telephony/ +obj-$(CONFIG_ASYNC_TX_DMA) += dma/ obj-$(CONFIG_MD) += md/ obj-$(CONFIG_BT) += bluetooth/ obj-$(CONFIG_ISDN) += isdn/ diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 30d021d..292ddad 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -7,8 +7,8 @@ menu DMA Engine support config DMA_ENGINE bool Support for DMA engines ---help--- - DMA engines offload copy operations from the CPU to dedicated - hardware, allowing the copies to happen asynchronously. + DMA engines offload bulk memory operations from the CPU to dedicated + hardware, allowing the operations to happen asynchronously. comment DMA Clients @@ -22,6 +22,16 @@ config NET_DMA Since this is the main user of the DMA engine, it should be enabled; say Y here. +config ASYNC_TX_DMA + tristate Asynchronous Bulk Memory Transfers/Transforms API + ---help--- + This enables the async_tx management layer for dma engines. + Subsystems coded to this API will use offload engines for bulk + memory operations where present. Software implementations are + called when a dma engine is not present or fails to allocate + memory to carry out the transaction. + Current subsystems ported to async_tx: MD_RAID4,5 + comment DMA Devices config INTEL_IOATDMA @@ -30,5 +40,4 @@ config INTEL_IOATDMA default m ---help--- Enable support for the Intel(R) I/OAT DMA engine. - endmenu diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index bdcfdbd..6a99341 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -1,3 +1,4 @@ obj-$(CONFIG_DMA_ENGINE) += dmaengine.o obj-$(CONFIG_NET_DMA) += iovlock.o obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o +obj-$(CONFIG_ASYNC_TX_DMA) += async_tx.o xor.o diff --git a/drivers/dma/async_tx.c b/drivers/dma/async_tx.c new file mode 100644 index 000..8f7e701 --- /dev/null +++ b/drivers/dma/async_tx.c @@ -0,0 +1,905 @@ +/* + * Copyright(c) 2006 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#include linux/kernel.h +#include linux/interrupt.h +#include linux/dma-mapping.h +#include linux/raid/xor.h +#include linux/async_tx.h + +#define ASYNC_TX_DEBUG 0 +#define PRINTK(x...)
