Merge branch 'ioat-md-accel-for-linus' of git://lost.foo-projects.org/~dwillia2/git/iop

* 'ioat-md-accel-for-linus' of git://lost.foo-projects.org/~dwillia2/git/iop: (28 commits)
  ioatdma: add the unisys "i/oat" pci vendor/device id
  ARM: Add drivers/dma to arch/arm/Kconfig
  iop3xx: surface the iop3xx DMA and AAU units to the iop-adma driver
  iop13xx: surface the iop13xx adma units to the iop-adma driver
  dmaengine: driver for the iop32x, iop33x, and iop13xx raid engines
  md: remove raid5 compute_block and compute_parity5
  md: handle_stripe5 - request io processing in raid5_run_ops
  md: handle_stripe5 - add request/completion logic for async expand ops
  md: handle_stripe5 - add request/completion logic for async read ops
  md: handle_stripe5 - add request/completion logic for async check ops
  md: handle_stripe5 - add request/completion logic for async compute ops
  md: handle_stripe5 - add request/completion logic for async write ops
  md: common infrastructure for running operations with raid5_run_ops
  md: raid5_run_ops - run stripe operations outside sh->lock
  raid5: replace custom debug PRINTKs with standard pr_debug
  raid5: refactor handle_stripe5 and handle_stripe6 (v3)
  async_tx: add the async_tx api
  xor: make 'xor_blocks' a library routine for use with async_tx
  dmaengine: make clients responsible for managing channels
  dmaengine: refactor dmaengine around dma_async_tx_descriptor
  ...

Documentation/networking/ip-sysctl.txt

@@ -433,6 +433,12 @@ tcp_workaround_signed_windows - BOOLEAN
 	not receive a window scaling option from them.
 	Default: 0
 
+tcp_dma_copybreak - INTEGER
+	Lower limit, in bytes, of the size of socket reads that will be
+	offloaded to a DMA copy engine, if one is present in the system
+	and CONFIG_NET_DMA is enabled.
+	Default: 4096
+
 CIPSOv4 Variables:
 
 cipso_cache_enable - BOOLEAN

arch/arm/Kconfig

@@ -1042,6 +1042,8 @@ source "drivers/mmc/Kconfig"
 
 source "drivers/rtc/Kconfig"
 
+source "drivers/dma/Kconfig"
+
 endmenu
 
 source "fs/Kconfig"

arch/arm/mach-iop13xx/setup.c

@@ -25,6 +25,7 @@
 #include <asm/hardware.h>
 #include <asm/irq.h>
 #include <asm/io.h>
+#include <asm/hardware/iop_adma.h>
 
 #define IOP13XX_UART_XTAL 33334000
 #define IOP13XX_SETUP_DEBUG 0
@@ -236,19 +237,143 @@ static unsigned long iq8134x_probe_flash_size(void)
 }
 #endif
 
+/* ADMA Channels */
+static struct resource iop13xx_adma_0_resources[] = {
+	[0] = {
+		.start = IOP13XX_ADMA_PHYS_BASE(0),
+		.end = IOP13XX_ADMA_UPPER_PA(0),
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = IRQ_IOP13XX_ADMA0_EOT,
+		.end = IRQ_IOP13XX_ADMA0_EOT,
+		.flags = IORESOURCE_IRQ
+	},
+	[2] = {
+		.start = IRQ_IOP13XX_ADMA0_EOC,
+		.end = IRQ_IOP13XX_ADMA0_EOC,
+		.flags = IORESOURCE_IRQ
+	},
+	[3] = {
+		.start = IRQ_IOP13XX_ADMA0_ERR,
+		.end = IRQ_IOP13XX_ADMA0_ERR,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+static struct resource iop13xx_adma_1_resources[] = {
+	[0] = {
+		.start = IOP13XX_ADMA_PHYS_BASE(1),
+		.end = IOP13XX_ADMA_UPPER_PA(1),
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = IRQ_IOP13XX_ADMA1_EOT,
+		.end = IRQ_IOP13XX_ADMA1_EOT,
+		.flags = IORESOURCE_IRQ
+	},
+	[2] = {
+		.start = IRQ_IOP13XX_ADMA1_EOC,
+		.end = IRQ_IOP13XX_ADMA1_EOC,
+		.flags = IORESOURCE_IRQ
+	},
+	[3] = {
+		.start = IRQ_IOP13XX_ADMA1_ERR,
+		.end = IRQ_IOP13XX_ADMA1_ERR,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+static struct resource iop13xx_adma_2_resources[] = {
+	[0] = {
+		.start = IOP13XX_ADMA_PHYS_BASE(2),
+		.end = IOP13XX_ADMA_UPPER_PA(2),
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = IRQ_IOP13XX_ADMA2_EOT,
+		.end = IRQ_IOP13XX_ADMA2_EOT,
+		.flags = IORESOURCE_IRQ
+	},
+	[2] = {
+		.start = IRQ_IOP13XX_ADMA2_EOC,
+		.end = IRQ_IOP13XX_ADMA2_EOC,
+		.flags = IORESOURCE_IRQ
+	},
+	[3] = {
+		.start = IRQ_IOP13XX_ADMA2_ERR,
+		.end = IRQ_IOP13XX_ADMA2_ERR,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+static u64 iop13xx_adma_dmamask = DMA_64BIT_MASK;
+static struct iop_adma_platform_data iop13xx_adma_0_data = {
+	.hw_id = 0,
+	.pool_size = PAGE_SIZE,
+};
+
+static struct iop_adma_platform_data iop13xx_adma_1_data = {
+	.hw_id = 1,
+	.pool_size = PAGE_SIZE,
+};
+
+static struct iop_adma_platform_data iop13xx_adma_2_data = {
+	.hw_id = 2,
+	.pool_size = PAGE_SIZE,
+};
+
+/* The ids are fixed up later in iop13xx_platform_init */
+static struct platform_device iop13xx_adma_0_channel = {
+	.name = "iop-adma",
+	.id = 0,
+	.num_resources = 4,
+	.resource = iop13xx_adma_0_resources,
+	.dev = {
+		.dma_mask = &iop13xx_adma_dmamask,
+		.coherent_dma_mask = DMA_64BIT_MASK,
+		.platform_data = (void *) &iop13xx_adma_0_data,
+	},
+};
+
+static struct platform_device iop13xx_adma_1_channel = {
+	.name = "iop-adma",
+	.id = 0,
+	.num_resources = 4,
+	.resource = iop13xx_adma_1_resources,
+	.dev = {
+		.dma_mask = &iop13xx_adma_dmamask,
+		.coherent_dma_mask = DMA_64BIT_MASK,
+		.platform_data = (void *) &iop13xx_adma_1_data,
+	},
+};
+
+static struct platform_device iop13xx_adma_2_channel = {
+	.name = "iop-adma",
+	.id = 0,
+	.num_resources = 4,
+	.resource = iop13xx_adma_2_resources,
+	.dev = {
+		.dma_mask = &iop13xx_adma_dmamask,
+		.coherent_dma_mask = DMA_64BIT_MASK,
+		.platform_data = (void *) &iop13xx_adma_2_data,
+	},
+};
+
 void __init iop13xx_map_io(void)
 {
 	/* Initialize the Static Page Table maps */
 	iotable_init(iop13xx_std_desc, ARRAY_SIZE(iop13xx_std_desc));
 }
 
-static int init_uart = 0;
-static int init_i2c = 0;
+static int init_uart;
+static int init_i2c;
+static int init_adma;
 
 void __init iop13xx_platform_init(void)
 {
 	int i;
-	u32 uart_idx, i2c_idx, plat_idx;
+	u32 uart_idx, i2c_idx, adma_idx, plat_idx;
 	struct platform_device *iop13xx_devices[IQ81340_MAX_PLAT_DEVICES];
 
 	/* set the bases so we can read the device id */
@@ -294,6 +419,12 @@ void __init iop13xx_platform_init(void)
 		}
 	}
 
+	if (init_adma == IOP13XX_INIT_ADMA_DEFAULT) {
+		init_adma |= IOP13XX_INIT_ADMA_0;
+		init_adma |= IOP13XX_INIT_ADMA_1;
+		init_adma |= IOP13XX_INIT_ADMA_2;
+	}
+
 	plat_idx = 0;
 	uart_idx = 0;
 	i2c_idx = 0;
@@ -332,6 +463,56 @@ void __init iop13xx_platform_init(void)
 		}
 	}
 
+	/* initialize adma channel ids and capabilities */
+	adma_idx = 0;
+	for (i = 0; i < IQ81340_NUM_ADMA; i++) {
+		struct iop_adma_platform_data *plat_data;
+		if ((init_adma & (1 << i)) && IOP13XX_SETUP_DEBUG)
+			printk(KERN_INFO
+				"Adding adma%d to platform device list\n", i);
+		switch (init_adma & (1 << i)) {
+		case IOP13XX_INIT_ADMA_0:
+			iop13xx_adma_0_channel.id = adma_idx++;
+			iop13xx_devices[plat_idx++] = &iop13xx_adma_0_channel;
+			plat_data = &iop13xx_adma_0_data;
+			dma_cap_set(DMA_MEMCPY, plat_data->cap_mask);
+			dma_cap_set(DMA_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_ZERO_SUM, plat_data->cap_mask);
+			dma_cap_set(DMA_MEMSET, plat_data->cap_mask);
+			dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask);
+			dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask);
+			break;
+		case IOP13XX_INIT_ADMA_1:
+			iop13xx_adma_1_channel.id = adma_idx++;
+			iop13xx_devices[plat_idx++] = &iop13xx_adma_1_channel;
+			plat_data = &iop13xx_adma_1_data;
+			dma_cap_set(DMA_MEMCPY, plat_data->cap_mask);
+			dma_cap_set(DMA_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_ZERO_SUM, plat_data->cap_mask);
+			dma_cap_set(DMA_MEMSET, plat_data->cap_mask);
+			dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask);
+			dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask);
+			break;
+		case IOP13XX_INIT_ADMA_2:
+			iop13xx_adma_2_channel.id = adma_idx++;
+			iop13xx_devices[plat_idx++] = &iop13xx_adma_2_channel;
+			plat_data = &iop13xx_adma_2_data;
+			dma_cap_set(DMA_MEMCPY, plat_data->cap_mask);
+			dma_cap_set(DMA_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_DUAL_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_ZERO_SUM, plat_data->cap_mask);
+			dma_cap_set(DMA_MEMSET, plat_data->cap_mask);
+			dma_cap_set(DMA_MEMCPY_CRC32C, plat_data->cap_mask);
+			dma_cap_set(DMA_INTERRUPT, plat_data->cap_mask);
+			dma_cap_set(DMA_PQ_XOR, plat_data->cap_mask);
+			dma_cap_set(DMA_PQ_UPDATE, plat_data->cap_mask);
+			dma_cap_set(DMA_PQ_ZERO_SUM, plat_data->cap_mask);
+			break;
+		}
+	}
+
 #ifdef CONFIG_MTD_PHYSMAP
 	iq8134x_flash_resource.end = iq8134x_flash_resource.start +
 				iq8134x_probe_flash_size() - 1;
@@ -399,5 +580,35 @@ static int __init iop13xx_init_i2c_setup(char *str)
 	return 1;
 }
 
+static int __init iop13xx_init_adma_setup(char *str)
+{
+	if (str)	{
+		while (*str != '\0') {
+			switch (*str) {
+			case '0':
+				init_adma |= IOP13XX_INIT_ADMA_0;
+				break;
+			case '1':
+				init_adma |= IOP13XX_INIT_ADMA_1;
+				break;
+			case '2':
+				init_adma |= IOP13XX_INIT_ADMA_2;
+				break;
+			case ',':
+			case '=':
+				break;
+			default:
+				PRINTK("\"iop13xx_init_adma\" malformed"
+					    " at character: \'%c\'", *str);
+				*(str + 1) = '\0';
+				init_adma = IOP13XX_INIT_ADMA_DEFAULT;
+			}
+			str++;
+		}
+	}
+	return 1;
+}
+
+__setup("iop13xx_init_adma", iop13xx_init_adma_setup);
 __setup("iop13xx_init_uart", iop13xx_init_uart_setup);
 __setup("iop13xx_init_i2c", iop13xx_init_i2c_setup);

arch/arm/mach-iop32x/glantank.c

@@ -180,6 +180,8 @@ static void __init glantank_init_machine(void)
 	platform_device_register(&iop3xx_i2c1_device);
 	platform_device_register(&glantank_flash_device);
 	platform_device_register(&glantank_serial_device);
+	platform_device_register(&iop3xx_dma_0_channel);
+	platform_device_register(&iop3xx_dma_1_channel);
 
 	pm_power_off = glantank_power_off;
 }

arch/arm/mach-iop32x/iq31244.c

@@ -298,9 +298,14 @@ static void __init iq31244_init_machine(void)
 	platform_device_register(&iop3xx_i2c1_device);
 	platform_device_register(&iq31244_flash_device);
 	platform_device_register(&iq31244_serial_device);
+	platform_device_register(&iop3xx_dma_0_channel);
+	platform_device_register(&iop3xx_dma_1_channel);
 
 	if (is_ep80219())
 		pm_power_off = ep80219_power_off;
+
+	if (!is_80219())
+		platform_device_register(&iop3xx_aau_channel);
 }
 
 static int __init force_ep80219_setup(char *str)

arch/arm/mach-iop32x/iq80321.c

@@ -181,6 +181,9 @@ static void __init iq80321_init_machine(void)
 	platform_device_register(&iop3xx_i2c1_device);
 	platform_device_register(&iq80321_flash_device);
 	platform_device_register(&iq80321_serial_device);
+	platform_device_register(&iop3xx_dma_0_channel);
+	platform_device_register(&iop3xx_dma_1_channel);
+	platform_device_register(&iop3xx_aau_channel);
 }
 
 MACHINE_START(IQ80321, "Intel IQ80321")

arch/arm/mach-iop32x/n2100.c

@@ -245,6 +245,8 @@ static void __init n2100_init_machine(void)
 	platform_device_register(&iop3xx_i2c0_device);
 	platform_device_register(&n2100_flash_device);
 	platform_device_register(&n2100_serial_device);
+	platform_device_register(&iop3xx_dma_0_channel);
+	platform_device_register(&iop3xx_dma_1_channel);
 
 	pm_power_off = n2100_power_off;
 

arch/arm/mach-iop33x/iq80331.c

@@ -136,6 +136,9 @@ static void __init iq80331_init_machine(void)
 	platform_device_register(&iop33x_uart0_device);
 	platform_device_register(&iop33x_uart1_device);
 	platform_device_register(&iq80331_flash_device);
+	platform_device_register(&iop3xx_dma_0_channel);
+	platform_device_register(&iop3xx_dma_1_channel);
+	platform_device_register(&iop3xx_aau_channel);
 }
 
 MACHINE_START(IQ80331, "Intel IQ80331")

arch/arm/mach-iop33x/iq80332.c

@@ -136,6 +136,9 @@ static void __init iq80332_init_machine(void)
 	platform_device_register(&iop33x_uart0_device);
 	platform_device_register(&iop33x_uart1_device);
 	platform_device_register(&iq80332_flash_device);
+	platform_device_register(&iop3xx_dma_0_channel);
+	platform_device_register(&iop3xx_dma_1_channel);
+	platform_device_register(&iop3xx_aau_channel);
 }
 
 MACHINE_START(IQ80332, "Intel IQ80332")

arch/arm/plat-iop/Makefile

@@ -12,6 +12,7 @@ obj-$(CONFIG_ARCH_IOP32X) += setup.o
 obj-$(CONFIG_ARCH_IOP32X) += time.o
 obj-$(CONFIG_ARCH_IOP32X) += io.o
 obj-$(CONFIG_ARCH_IOP32X) += cp6.o
+obj-$(CONFIG_ARCH_IOP32X) += adma.o
 
 # IOP33X
 obj-$(CONFIG_ARCH_IOP33X) += gpio.o
@@ -21,6 +22,7 @@ obj-$(CONFIG_ARCH_IOP33X) += setup.o
 obj-$(CONFIG_ARCH_IOP33X) += time.o
 obj-$(CONFIG_ARCH_IOP33X) += io.o
 obj-$(CONFIG_ARCH_IOP33X) += cp6.o
+obj-$(CONFIG_ARCH_IOP33X) += adma.o
 
 # IOP13XX
 obj-$(CONFIG_ARCH_IOP13XX) += cp6.o

arch/arm/plat-iop/adma.c

+/*
+ * platform device definitions for the iop3xx dma/xor engines
+ * Copyright © 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/platform_device.h>
+#include <asm/hardware/iop3xx.h>
+#include <linux/dma-mapping.h>
+#include <asm/arch/adma.h>
+#include <asm/hardware/iop_adma.h>
+
+#ifdef CONFIG_ARCH_IOP32X
+#define IRQ_DMA0_EOT IRQ_IOP32X_DMA0_EOT
+#define IRQ_DMA0_EOC IRQ_IOP32X_DMA0_EOC
+#define IRQ_DMA0_ERR IRQ_IOP32X_DMA0_ERR
+
+#define IRQ_DMA1_EOT IRQ_IOP32X_DMA1_EOT
+#define IRQ_DMA1_EOC IRQ_IOP32X_DMA1_EOC
+#define IRQ_DMA1_ERR IRQ_IOP32X_DMA1_ERR
+
+#define IRQ_AA_EOT IRQ_IOP32X_AA_EOT
+#define IRQ_AA_EOC IRQ_IOP32X_AA_EOC
+#define IRQ_AA_ERR IRQ_IOP32X_AA_ERR
+#endif
+#ifdef CONFIG_ARCH_IOP33X
+#define IRQ_DMA0_EOT IRQ_IOP33X_DMA0_EOT
+#define IRQ_DMA0_EOC IRQ_IOP33X_DMA0_EOC
+#define IRQ_DMA0_ERR IRQ_IOP33X_DMA0_ERR
+
+#define IRQ_DMA1_EOT IRQ_IOP33X_DMA1_EOT
+#define IRQ_DMA1_EOC IRQ_IOP33X_DMA1_EOC
+#define IRQ_DMA1_ERR IRQ_IOP33X_DMA1_ERR
+
+#define IRQ_AA_EOT IRQ_IOP33X_AA_EOT
+#define IRQ_AA_EOC IRQ_IOP33X_AA_EOC
+#define IRQ_AA_ERR IRQ_IOP33X_AA_ERR
+#endif
+/* AAU and DMA Channels */
+static struct resource iop3xx_dma_0_resources[] = {
+	[0] = {
+		.start = IOP3XX_DMA_PHYS_BASE(0),
+		.end = IOP3XX_DMA_UPPER_PA(0),
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = IRQ_DMA0_EOT,
+		.end = IRQ_DMA0_EOT,
+		.flags = IORESOURCE_IRQ
+	},
+	[2] = {
+		.start = IRQ_DMA0_EOC,
+		.end = IRQ_DMA0_EOC,
+		.flags = IORESOURCE_IRQ
+	},
+	[3] = {
+		.start = IRQ_DMA0_ERR,
+		.end = IRQ_DMA0_ERR,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+static struct resource iop3xx_dma_1_resources[] = {
+	[0] = {
+		.start = IOP3XX_DMA_PHYS_BASE(1),
+		.end = IOP3XX_DMA_UPPER_PA(1),
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = IRQ_DMA1_EOT,
+		.end = IRQ_DMA1_EOT,
+		.flags = IORESOURCE_IRQ
+	},
+	[2] = {
+		.start = IRQ_DMA1_EOC,
+		.end = IRQ_DMA1_EOC,
+		.flags = IORESOURCE_IRQ
+	},
+	[3] = {
+		.start = IRQ_DMA1_ERR,
+		.end = IRQ_DMA1_ERR,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+
+static struct resource iop3xx_aau_resources[] = {
+	[0] = {
+		.start = IOP3XX_AAU_PHYS_BASE,
+		.end = IOP3XX_AAU_UPPER_PA,
+		.flags = IORESOURCE_MEM,
+	},
+	[1] = {
+		.start = IRQ_AA_EOT,
+		.end = IRQ_AA_EOT,
+		.flags = IORESOURCE_IRQ
+	},
+	[2] = {
+		.start = IRQ_AA_EOC,
+		.end = IRQ_AA_EOC,
+		.flags = IORESOURCE_IRQ
+	},
+	[3] = {
+		.start = IRQ_AA_ERR,
+		.end = IRQ_AA_ERR,
+		.flags = IORESOURCE_IRQ
+	}
+};
+
+static u64 iop3xx_adma_dmamask = DMA_32BIT_MASK;
+
+static struct iop_adma_platform_data iop3xx_dma_0_data = {
+	.hw_id = DMA0_ID,
+	.pool_size = PAGE_SIZE,
+};
+
+static struct iop_adma_platform_data iop3xx_dma_1_data = {
+	.hw_id = DMA1_ID,
+	.pool_size = PAGE_SIZE,
+};
+
+static struct iop_adma_platform_data iop3xx_aau_data = {
+	.hw_id = AAU_ID,
+	.pool_size = 3 * PAGE_SIZE,
+};
+
+struct platform_device iop3xx_dma_0_channel = {
+	.name = "iop-adma",
+	.id = 0,
+	.num_resources = 4,
+	.resource = iop3xx_dma_0_resources,
+	.dev = {
+		.dma_mask = &iop3xx_adma_dmamask,
+		.coherent_dma_mask = DMA_64BIT_MASK,
+		.platform_data = (void *) &iop3xx_dma_0_data,
+	},
+};
+
+struct platform_device iop3xx_dma_1_channel = {
+	.name = "iop-adma",
+	.id = 1,
+	.num_resources = 4,
+	.resource = iop3xx_dma_1_resources,
+	.dev = {
+		.dma_mask = &iop3xx_adma_dmamask,
+		.coherent_dma_mask = DMA_64BIT_MASK,
+		.platform_data = (void *) &iop3xx_dma_1_data,
+	},
+};
+
+struct platform_device iop3xx_aau_channel = {
+	.name = "iop-adma",
+	.id = 2,
+	.num_resources = 4,
+	.resource = iop3xx_aau_resources,
+	.dev = {
+		.dma_mask = &iop3xx_adma_dmamask,
+		.coherent_dma_mask = DMA_64BIT_MASK,
+		.platform_data = (void *) &iop3xx_aau_data,
+	},
+};
+
+static int __init iop3xx_adma_cap_init(void)
+{
+	#ifdef CONFIG_ARCH_IOP32X /* the 32x DMA does not perform CRC32C */
+	dma_cap_set(DMA_MEMCPY, iop3xx_dma_0_data.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, iop3xx_dma_0_data.cap_mask);
+	#else
+	dma_cap_set(DMA_MEMCPY, iop3xx_dma_0_data.cap_mask);
+	dma_cap_set(DMA_MEMCPY_CRC32C, iop3xx_dma_0_data.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, iop3xx_dma_0_data.cap_mask);
+	#endif
+
+	#ifdef CONFIG_ARCH_IOP32X /* the 32x DMA does not perform CRC32C */
+	dma_cap_set(DMA_MEMCPY, iop3xx_dma_1_data.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, iop3xx_dma_1_data.cap_mask);
+	#else
+	dma_cap_set(DMA_MEMCPY, iop3xx_dma_1_data.cap_mask);
+	dma_cap_set(DMA_MEMCPY_CRC32C, iop3xx_dma_1_data.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, iop3xx_dma_1_data.cap_mask);
+	#endif
+
+	#ifdef CONFIG_ARCH_IOP32X /* the 32x AAU does not perform zero sum */
+	dma_cap_set(DMA_XOR, iop3xx_aau_data.cap_mask);
+	dma_cap_set(DMA_MEMSET, iop3xx_aau_data.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, iop3xx_aau_data.cap_mask);
+	#else
+	dma_cap_set(DMA_XOR, iop3xx_aau_data.cap_mask);
+	dma_cap_set(DMA_ZERO_SUM, iop3xx_aau_data.cap_mask);
+	dma_cap_set(DMA_MEMSET, iop3xx_aau_data.cap_mask);
+	dma_cap_set(DMA_INTERRUPT, iop3xx_aau_data.cap_mask);
+	#endif
+
+	return 0;
+}
+
+arch_initcall(iop3xx_adma_cap_init);

crypto/Kconfig

 #
-# Cryptographic API Configuration
+# Generic algorithms support
+#
+config XOR_BLOCKS
+	tristate
+
 #
+# async_tx api: hardware offloaded memory transfer/transform support
+#
+source "crypto/async_tx/Kconfig"
 
+#
+# Cryptographic API Configuration
+#
 menu "Cryptographic options"
 
 config CRYPTO

crypto/Makefile

@@ -50,3 +50,9 @@ obj-$(CONFIG_CRYPTO_MICHAEL_MIC) += michael_mic.o
 obj-$(CONFIG_CRYPTO_CRC32C) += crc32c.o
 
 obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
+
+#
+# generic algorithms and the async_tx api
+#
+obj-$(CONFIG_XOR_BLOCKS) += xor.o
+obj-$(CONFIG_ASYNC_CORE) += async_tx/

crypto/async_tx/Kconfig

+config ASYNC_CORE
+	tristate
+
+config ASYNC_MEMCPY
+	tristate
+	select ASYNC_CORE
+
+config ASYNC_XOR
+	tristate
+	select ASYNC_CORE
+	select XOR_BLOCKS
+
+config ASYNC_MEMSET
+	tristate
+	select ASYNC_CORE
+

crypto/async_tx/Makefile

+obj-$(CONFIG_ASYNC_CORE) += async_tx.o
+obj-$(CONFIG_ASYNC_MEMCPY) += async_memcpy.o
+obj-$(CONFIG_ASYNC_MEMSET) += async_memset.o
+obj-$(CONFIG_ASYNC_XOR) += async_xor.o

crypto/async_tx/async_memcpy.c

+/*
+ * copy offload engine support
+ *
+ * Copyright © 2006, Intel Corporation.
+ *
+ *      Dan Williams <dan.j.williams@intel.com>
+ *
+ *      with architecture considerations by:
+ *      Neil Brown <neilb@suse.de>
+ *      Jeff Garzik <jeff@garzik.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/highmem.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/async_tx.h>
+
+/**
+ * async_memcpy - attempt to copy memory with a dma engine.
+ * @dest: destination page
+ * @src: src page
+ * @offset: offset in pages to start transaction
+ * @len: length in bytes
+ * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK,
+ *	ASYNC_TX_KMAP_SRC, ASYNC_TX_KMAP_DST
+ * @depend_tx: memcpy depends on the result of this transaction
+ * @cb_fn: function to call when the memcpy completes
+ * @cb_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
+	unsigned int src_offset, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMCPY);
+	struct dma_device *device = chan ? chan->device : NULL;
+	int int_en = cb_fn ? 1 : 0;
+	struct dma_async_tx_descriptor *tx = device ?
+		device->device_prep_dma_memcpy(chan, len,
+		int_en) : NULL;
+
+	if (tx) { /* run the memcpy asynchronously */
+		dma_addr_t addr;
+		enum dma_data_direction dir;
+
+		pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
+
+		dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
+			DMA_NONE : DMA_FROM_DEVICE;
+
+		addr = dma_map_page(device->dev, dest, dest_offset, len, dir);
+		tx->tx_set_dest(addr, tx, 0);
+
+		dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
+			DMA_NONE : DMA_TO_DEVICE;
+
+		addr = dma_map_page(device->dev, src, src_offset, len, dir);
+		tx->tx_set_src(addr, tx, 0);
+
+		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+	} else { /* run the memcpy synchronously */
+		void *dest_buf, *src_buf;
+		pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len);
+
+		/* wait for any prerequisite operations */
+		if (depend_tx) {
+			/* if ack is already set then we cannot be sure
+			 * we are referring to the correct operation
+			 */
+			BUG_ON(depend_tx->ack);
+			if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
+				panic("%s: DMA_ERROR waiting for depend_tx\n",
+					__FUNCTION__);
+		}
+
+		if (flags & ASYNC_TX_KMAP_DST)
+			dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset;
+		else
+			dest_buf = page_address(dest) + dest_offset;
+
+		if (flags & ASYNC_TX_KMAP_SRC)
+			src_buf = kmap_atomic(src, KM_USER0) + src_offset;
+		else
+			src_buf = page_address(src) + src_offset;
+
+		memcpy(dest_buf, src_buf, len);
+
+		if (flags & ASYNC_TX_KMAP_DST)
+			kunmap_atomic(dest_buf, KM_USER0);
+
+		if (flags & ASYNC_TX_KMAP_SRC)
+			kunmap_atomic(src_buf, KM_USER0);
+
+		async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_memcpy);
+
+static int __init async_memcpy_init(void)
+{
+	return 0;
+}
+
+static void __exit async_memcpy_exit(void)
+{
+	do { } while (0);
+}
+
+module_init(async_memcpy_init);
+module_exit(async_memcpy_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("asynchronous memcpy api");
+MODULE_LICENSE("GPL");

crypto/async_tx/async_memset.c

+/*
+ * memory fill offload engine support
+ *
+ * Copyright © 2006, Intel Corporation.
+ *
+ *      Dan Williams <dan.j.williams@intel.com>
+ *
+ *      with architecture considerations by:
+ *      Neil Brown <neilb@suse.de>
+ *      Jeff Garzik <jeff@garzik.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/async_tx.h>
+
+/**
+ * async_memset - attempt to fill memory with a dma engine.
+ * @dest: destination page
+ * @val: fill value
+ * @offset: offset in pages to start transaction
+ * @len: length in bytes
+ * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @depend_tx: memset depends on the result of this transaction
+ * @cb_fn: function to call when the memcpy completes
+ * @cb_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_memset(struct page *dest, int val, unsigned int offset,
+	size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_MEMSET);
+	struct dma_device *device = chan ? chan->device : NULL;
+	int int_en = cb_fn ? 1 : 0;
+	struct dma_async_tx_descriptor *tx = device ?
+		device->device_prep_dma_memset(chan, val, len,
+			int_en) : NULL;
+
+	if (tx) { /* run the memset asynchronously */
+		dma_addr_t dma_addr;
+		enum dma_data_direction dir;
+
+		pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
+		dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
+			DMA_NONE : DMA_FROM_DEVICE;
+
+		dma_addr = dma_map_page(device->dev, dest, offset, len, dir);
+		tx->tx_set_dest(dma_addr, tx, 0);
+
+		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+	} else { /* run the memset synchronously */
+		void *dest_buf;
+		pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len);
+
+		dest_buf = (void *) (((char *) page_address(dest)) + offset);
+
+		/* wait for any prerequisite operations */
+		if (depend_tx) {
+			/* if ack is already set then we cannot be sure
+			 * we are referring to the correct operation
+			 */
+			BUG_ON(depend_tx->ack);
+			if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
+				panic("%s: DMA_ERROR waiting for depend_tx\n",
+					__FUNCTION__);
+		}
+
+		memset(dest_buf, val, len);
+
+		async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_memset);
+
+static int __init async_memset_init(void)
+{
+	return 0;
+}
+
+static void __exit async_memset_exit(void)
+{
+	do { } while (0);
+}
+
+module_init(async_memset_init);
+module_exit(async_memset_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("asynchronous memset api");
+MODULE_LICENSE("GPL");

crypto/async_tx/async_tx.c

+/*
+ * core routines for the asynchronous memory transfer/transform api
+ *
+ * Copyright © 2006, Intel Corporation.
+ *
+ *	Dan Williams <dan.j.williams@intel.com>
+ *
+ *	with architecture considerations by:
+ *	Neil Brown <neilb@suse.de>
+ *	Jeff Garzik <jeff@garzik.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/async_tx.h>
+
+#ifdef CONFIG_DMA_ENGINE
+static enum dma_state_client
+dma_channel_add_remove(struct dma_client *client,
+	struct dma_chan *chan, enum dma_state state);
+
+static struct dma_client async_tx_dma = {
+	.event_callback = dma_channel_add_remove,
+	/* .cap_mask == 0 defaults to all channels */
+};
+
+/**
+ * dma_cap_mask_all - enable iteration over all operation types
+ */
+static dma_cap_mask_t dma_cap_mask_all;
+
+/**
+ * chan_ref_percpu - tracks channel allocations per core/opertion
+ */
+struct chan_ref_percpu {
+	struct dma_chan_ref *ref;
+};
+
+static int channel_table_initialized;
+static struct chan_ref_percpu *channel_table[DMA_TX_TYPE_END];
+
+/**
+ * async_tx_lock - protect modification of async_tx_master_list and serialize
+ *	rebalance operations
+ */
+static spinlock_t async_tx_lock;
+
+static struct list_head
+async_tx_master_list = LIST_HEAD_INIT(async_tx_master_list);
+
+/* async_tx_issue_pending_all - start all transactions on all channels */
+void async_tx_issue_pending_all(void)
+{
+	struct dma_chan_ref *ref;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ref, &async_tx_master_list, node)
+		ref->chan->device->device_issue_pending(ref->chan);
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(async_tx_issue_pending_all);
+
+/* dma_wait_for_async_tx - spin wait for a transcation to complete
+ * @tx: transaction to wait on
+ */
+enum dma_status
+dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
+{
+	enum dma_status status;
+	struct dma_async_tx_descriptor *iter;
+
+	if (!tx)
+		return DMA_SUCCESS;
+
+	/* poll through the dependency chain, return when tx is complete */
+	do {
+		iter = tx;
+		while (iter->cookie == -EBUSY)
+			iter = iter->parent;
+
+		status = dma_sync_wait(iter->chan, iter->cookie);
+	} while (status == DMA_IN_PROGRESS || (iter != tx));
+
+	return status;
+}
+EXPORT_SYMBOL_GPL(dma_wait_for_async_tx);
+
+/* async_tx_run_dependencies - helper routine for dma drivers to process
+ *	(start) dependent operations on their target channel
+ * @tx: transaction with dependencies
+ */
+void
+async_tx_run_dependencies(struct dma_async_tx_descriptor *tx)
+{
+	struct dma_async_tx_descriptor *dep_tx, *_dep_tx;
+	struct dma_device *dev;
+	struct dma_chan *chan;
+
+	list_for_each_entry_safe(dep_tx, _dep_tx, &tx->depend_list,
+		depend_node) {
+		chan = dep_tx->chan;
+		dev = chan->device;
+		/* we can't depend on ourselves */
+		BUG_ON(chan == tx->chan);
+		list_del(&dep_tx->depend_node);
+		tx->tx_submit(dep_tx);
+
+		/* we need to poke the engine as client code does not
+		 * know about dependency submission events
+		 */
+		dev->device_issue_pending(chan);
+	}
+}
+EXPORT_SYMBOL_GPL(async_tx_run_dependencies);
+
+static void
+free_dma_chan_ref(struct rcu_head *rcu)
+{
+	struct dma_chan_ref *ref;
+	ref = container_of(rcu, struct dma_chan_ref, rcu);
+	kfree(ref);
+}
+
+static void
+init_dma_chan_ref(struct dma_chan_ref *ref, struct dma_chan *chan)
+{
+	INIT_LIST_HEAD(&ref->node);
+	INIT_RCU_HEAD(&ref->rcu);
+	ref->chan = chan;
+	atomic_set(&ref->count, 0);
+}
+
+/**
+ * get_chan_ref_by_cap - returns the nth channel of the given capability
+ * 	defaults to returning the channel with the desired capability and the
+ * 	lowest reference count if the index can not be satisfied
+ * @cap: capability to match
+ * @index: nth channel desired, passing -1 has the effect of forcing the
+ *  default return value
+ */
+static struct dma_chan_ref *
+get_chan_ref_by_cap(enum dma_transaction_type cap, int index)
+{
+	struct dma_chan_ref *ret_ref = NULL, *min_ref = NULL, *ref;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ref, &async_tx_master_list, node)
+		if (dma_has_cap(cap, ref->chan->device->cap_mask)) {
+			if (!min_ref)
+				min_ref = ref;
+			else if (atomic_read(&ref->count) <
+				atomic_read(&min_ref->count))
+				min_ref = ref;
+
+			if (index-- == 0) {
+				ret_ref = ref;
+				break;
+			}
+		}
+	rcu_read_unlock();
+
+	if (!ret_ref)
+		ret_ref = min_ref;
+
+	if (ret_ref)
+		atomic_inc(&ret_ref->count);
+
+	return ret_ref;
+}
+
+/**
+ * async_tx_rebalance - redistribute the available channels, optimize
+ * for cpu isolation in the SMP case, and opertaion isolation in the
+ * uniprocessor case
+ */
+static void async_tx_rebalance(void)
+{
+	int cpu, cap, cpu_idx = 0;
+	unsigned long flags;
+
+	if (!channel_table_initialized)
+		return;
+
+	spin_lock_irqsave(&async_tx_lock, flags);
+
+	/* undo the last distribution */
+	for_each_dma_cap_mask(cap, dma_cap_mask_all)
+		for_each_possible_cpu(cpu) {
+			struct dma_chan_ref *ref =
+				per_cpu_ptr(channel_table[cap], cpu)->ref;
+			if (ref) {
+				atomic_set(&ref->count, 0);
+				per_cpu_ptr(channel_table[cap], cpu)->ref =
+									NULL;
+			}
+		}
+
+	for_each_dma_cap_mask(cap, dma_cap_mask_all)
+		for_each_online_cpu(cpu) {
+			struct dma_chan_ref *new;
+			if (NR_CPUS > 1)
+				new = get_chan_ref_by_cap(cap, cpu_idx++);
+			else
+				new = get_chan_ref_by_cap(cap, -1);
+
+			per_cpu_ptr(channel_table[cap], cpu)->ref = new;
+		}
+
+	spin_unlock_irqrestore(&async_tx_lock, flags);
+}
+
+static enum dma_state_client
+dma_channel_add_remove(struct dma_client *client,
+	struct dma_chan *chan, enum dma_state state)
+{
+	unsigned long found, flags;
+	struct dma_chan_ref *master_ref, *ref;
+	enum dma_state_client ack = DMA_DUP; /* default: take no action */
+
+	switch (state) {
+	case DMA_RESOURCE_AVAILABLE:
+		found = 0;
+		rcu_read_lock();
+		list_for_each_entry_rcu(ref, &async_tx_master_list, node)
+			if (ref->chan == chan) {
+				found = 1;
+				break;
+			}
+		rcu_read_unlock();
+
+		pr_debug("async_tx: dma resource available [%s]\n",
+			found ? "old" : "new");
+
+		if (!found)
+			ack = DMA_ACK;
+		else
+			break;
+
+		/* add the channel to the generic management list */
+		master_ref = kmalloc(sizeof(*master_ref), GFP_KERNEL);
+		if (master_ref) {
+			/* keep a reference until async_tx is unloaded */
+			dma_chan_get(chan);
+			init_dma_chan_ref(master_ref, chan);
+			spin_lock_irqsave(&async_tx_lock, flags);
+			list_add_tail_rcu(&master_ref->node,
+				&async_tx_master_list);
+			spin_unlock_irqrestore(&async_tx_lock,
+				flags);
+		} else {
+			printk(KERN_WARNING "async_tx: unable to create"
+				" new master entry in response to"
+				" a DMA_RESOURCE_ADDED event"
+				" (-ENOMEM)\n");
+			return 0;
+		}
+
+		async_tx_rebalance();
+		break;
+	case DMA_RESOURCE_REMOVED:
+		found = 0;
+		spin_lock_irqsave(&async_tx_lock, flags);
+		list_for_each_entry_rcu(ref, &async_tx_master_list, node)
+			if (ref->chan == chan) {
+				/* permit backing devices to go away */
+				dma_chan_put(ref->chan);
+				list_del_rcu(&ref->node);
+				call_rcu(&ref->rcu, free_dma_chan_ref);
+				found = 1;
+				break;
+			}
+		spin_unlock_irqrestore(&async_tx_lock, flags);
+
+		pr_debug("async_tx: dma resource removed [%s]\n",
+			found ? "ours" : "not ours");
+
+		if (found)
+			ack = DMA_ACK;
+		else
+			break;
+
+		async_tx_rebalance();
+		break;
+	case DMA_RESOURCE_SUSPEND:
+	case DMA_RESOURCE_RESUME:
+		printk(KERN_WARNING "async_tx: does not support dma channel"
+			" suspend/resume\n");
+		break;
+	default:
+		BUG();
+	}
+
+	return ack;
+}
+
+static int __init
+async_tx_init(void)
+{
+	enum dma_transaction_type cap;
+
+	spin_lock_init(&async_tx_lock);
+	bitmap_fill(dma_cap_mask_all.bits, DMA_TX_TYPE_END);
+
+	/* an interrupt will never be an explicit operation type.
+	 * clearing this bit prevents allocation to a slot in 'channel_table'
+	 */
+	clear_bit(DMA_INTERRUPT, dma_cap_mask_all.bits);
+
+	for_each_dma_cap_mask(cap, dma_cap_mask_all) {
+		channel_table[cap] = alloc_percpu(struct chan_ref_percpu);
+		if (!channel_table[cap])
+			goto err;
+	}
+
+	channel_table_initialized = 1;
+	dma_async_client_register(&async_tx_dma);
+	dma_async_client_chan_request(&async_tx_dma);
+
+	printk(KERN_INFO "async_tx: api initialized (async)\n");
+
+	return 0;
+err:
+	printk(KERN_ERR "async_tx: initialization failure\n");
+
+	while (--cap >= 0)
+		free_percpu(channel_table[cap]);
+
+	return 1;
+}
+
+static void __exit async_tx_exit(void)
+{
+	enum dma_transaction_type cap;
+
+	channel_table_initialized = 0;
+
+	for_each_dma_cap_mask(cap, dma_cap_mask_all)
+		if (channel_table[cap])
+			free_percpu(channel_table[cap]);
+
+	dma_async_client_unregister(&async_tx_dma);
+}
+
+/**
+ * async_tx_find_channel - find a channel to carry out the operation or let
+ *	the transaction execute synchronously
+ * @depend_tx: transaction dependency
+ * @tx_type: transaction type
+ */
+struct dma_chan *
+async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
+	enum dma_transaction_type tx_type)
+{
+	/* see if we can keep the chain on one channel */
+	if (depend_tx &&
+		dma_has_cap(tx_type, depend_tx->chan->device->cap_mask))
+		return depend_tx->chan;
+	else if (likely(channel_table_initialized)) {
+		struct dma_chan_ref *ref;
+		int cpu = get_cpu();
+		ref = per_cpu_ptr(channel_table[tx_type], cpu)->ref;
+		put_cpu();
+		return ref ? ref->chan : NULL;
+	} else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(async_tx_find_channel);
+#else
+static int __init async_tx_init(void)
+{
+	printk(KERN_INFO "async_tx: api initialized (sync-only)\n");
+	return 0;
+}
+
+static void __exit async_tx_exit(void)
+{
+	do { } while (0);
+}
+#endif
+
+void
+async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
+	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	tx->callback = cb_fn;
+	tx->callback_param = cb_param;
+
+	/* set this new tx to run after depend_tx if:
+	 * 1/ a dependency exists (depend_tx is !NULL)
+	 * 2/ the tx can not be submitted to the current channel
+	 */
+	if (depend_tx && depend_tx->chan != chan) {
+		/* if ack is already set then we cannot be sure
+		 * we are referring to the correct operation
+		 */
+		BUG_ON(depend_tx->ack);
+
+		tx->parent = depend_tx;
+		spin_lock_bh(&depend_tx->lock);
+		list_add_tail(&tx->depend_node, &depend_tx->depend_list);
+		if (depend_tx->cookie == 0) {
+			struct dma_chan *dep_chan = depend_tx->chan;
+			struct dma_device *dep_dev = dep_chan->device;
+			dep_dev->device_dependency_added(dep_chan);
+		}
+		spin_unlock_bh(&depend_tx->lock);
+
+		/* schedule an interrupt to trigger the channel switch */
+		async_trigger_callback(ASYNC_TX_ACK, depend_tx, NULL, NULL);
+	} else {
+		tx->parent = NULL;
+		tx->tx_submit(tx);
+	}
+
+	if (flags & ASYNC_TX_ACK)
+		async_tx_ack(tx);
+
+	if (depend_tx && (flags & ASYNC_TX_DEP_ACK))
+		async_tx_ack(depend_tx);
+}
+EXPORT_SYMBOL_GPL(async_tx_submit);
+
+/**
+ * async_trigger_callback - schedules the callback function to be run after
+ * any dependent operations have been completed.
+ * @flags: ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @depend_tx: 'callback' requires the completion of this transaction
+ * @cb_fn: function to call after depend_tx completes
+ * @cb_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_trigger_callback(enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan;
+	struct dma_device *device;
+	struct dma_async_tx_descriptor *tx;
+
+	if (depend_tx) {
+		chan = depend_tx->chan;
+		device = chan->device;
+
+		/* see if we can schedule an interrupt
+		 * otherwise poll for completion
+		 */
+		if (device && !dma_has_cap(DMA_INTERRUPT, device->cap_mask))
+			device = NULL;
+
+		tx = device ? device->device_prep_dma_interrupt(chan) : NULL;
+	} else
+		tx = NULL;
+
+	if (tx) {
+		pr_debug("%s: (async)\n", __FUNCTION__);
+
+		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+	} else {
+		pr_debug("%s: (sync)\n", __FUNCTION__);
+
+		/* wait for any prerequisite operations */
+		if (depend_tx) {
+			/* if ack is already set then we cannot be sure
+			 * we are referring to the correct operation
+			 */
+			BUG_ON(depend_tx->ack);
+			if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
+				panic("%s: DMA_ERROR waiting for depend_tx\n",
+					__FUNCTION__);
+		}
+
+		async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_trigger_callback);
+
+module_init(async_tx_init);
+module_exit(async_tx_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("Asynchronous Bulk Memory Transactions API");
+MODULE_LICENSE("GPL");

crypto/async_tx/async_xor.c

+/*
+ * xor offload engine api
+ *
+ * Copyright © 2006, Intel Corporation.
+ *
+ *      Dan Williams <dan.j.williams@intel.com>
+ *
+ *      with architecture considerations by:
+ *      Neil Brown <neilb@suse.de>
+ *      Jeff Garzik <jeff@garzik.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/raid/xor.h>
+#include <linux/async_tx.h>
+
+static void
+do_async_xor(struct dma_async_tx_descriptor *tx, struct dma_device *device,
+	struct dma_chan *chan, struct page *dest, struct page **src_list,
+	unsigned int offset, unsigned int src_cnt, size_t len,
+	enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	dma_addr_t dma_addr;
+	enum dma_data_direction dir;
+	int i;
+
+	pr_debug("%s: len: %zu\n", __FUNCTION__, len);
+
+	dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
+		DMA_NONE : DMA_FROM_DEVICE;
+
+	dma_addr = dma_map_page(device->dev, dest, offset, len, dir);
+	tx->tx_set_dest(dma_addr, tx, 0);
+
+	dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
+		DMA_NONE : DMA_TO_DEVICE;
+
+	for (i = 0; i < src_cnt; i++) {
+		dma_addr = dma_map_page(device->dev, src_list[i],
+			offset, len, dir);
+		tx->tx_set_src(dma_addr, tx, i);
+	}
+
+	async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+}
+
+static void
+do_sync_xor(struct page *dest, struct page **src_list, unsigned int offset,
+	unsigned int src_cnt, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	void *_dest;
+	int i;
+
+	pr_debug("%s: len: %zu\n", __FUNCTION__, len);
+
+	/* reuse the 'src_list' array to convert to buffer pointers */
+	for (i = 0; i < src_cnt; i++)
+		src_list[i] = (struct page *)
+			(page_address(src_list[i]) + offset);
+
+	/* set destination address */
+	_dest = page_address(dest) + offset;
+
+	if (flags & ASYNC_TX_XOR_ZERO_DST)
+		memset(_dest, 0, len);
+
+	xor_blocks(src_cnt, len, _dest,
+		(void **) src_list);
+
+	async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
+}
+
+/**
+ * async_xor - attempt to xor a set of blocks with a dma engine.
+ *	xor_blocks always uses the dest as a source so the ASYNC_TX_XOR_ZERO_DST
+ *	flag must be set to not include dest data in the calculation.  The
+ *	assumption with dma eninges is that they only use the destination
+ *	buffer as a source when it is explicity specified in the source list.
+ * @dest: destination page
+ * @src_list: array of source pages (if the dest is also a source it must be
+ *	at index zero).  The contents of this array may be overwritten.
+ * @offset: offset in pages to start transaction
+ * @src_cnt: number of source pages
+ * @len: length in bytes
+ * @flags: ASYNC_TX_XOR_ZERO_DST, ASYNC_TX_XOR_DROP_DEST,
+ *	ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @depend_tx: xor depends on the result of this transaction.
+ * @cb_fn: function to call when the xor completes
+ * @cb_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_xor(struct page *dest, struct page **src_list, unsigned int offset,
+	int src_cnt, size_t len, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_XOR);
+	struct dma_device *device = chan ? chan->device : NULL;
+	struct dma_async_tx_descriptor *tx = NULL;
+	dma_async_tx_callback _cb_fn;
+	void *_cb_param;
+	unsigned long local_flags;
+	int xor_src_cnt;
+	int i = 0, src_off = 0, int_en;
+
+	BUG_ON(src_cnt <= 1);
+
+	while (src_cnt) {
+		local_flags = flags;
+		if (device) { /* run the xor asynchronously */
+			xor_src_cnt = min(src_cnt, device->max_xor);
+			/* if we are submitting additional xors
+			 * only set the callback on the last transaction
+			 */
+			if (src_cnt > xor_src_cnt) {
+				local_flags &= ~ASYNC_TX_ACK;
+				_cb_fn = NULL;
+				_cb_param = NULL;
+			} else {
+				_cb_fn = cb_fn;
+				_cb_param = cb_param;
+			}
+
+			int_en = _cb_fn ? 1 : 0;
+
+			tx = device->device_prep_dma_xor(
+				chan, xor_src_cnt, len, int_en);
+
+			if (tx) {
+				do_async_xor(tx, device, chan, dest,
+				&src_list[src_off], offset, xor_src_cnt, len,
+				local_flags, depend_tx, _cb_fn,
+				_cb_param);
+			} else /* fall through */
+				goto xor_sync;
+		} else { /* run the xor synchronously */
+xor_sync:
+			/* in the sync case the dest is an implied source
+			 * (assumes the dest is at the src_off index)
+			 */
+			if (flags & ASYNC_TX_XOR_DROP_DST) {
+				src_cnt--;
+				src_off++;
+			}
+
+			/* process up to 'MAX_XOR_BLOCKS' sources */
+			xor_src_cnt = min(src_cnt, MAX_XOR_BLOCKS);
+
+			/* if we are submitting additional xors
+			 * only set the callback on the last transaction
+			 */
+			if (src_cnt > xor_src_cnt) {
+				local_flags &= ~ASYNC_TX_ACK;
+				_cb_fn = NULL;
+				_cb_param = NULL;
+			} else {
+				_cb_fn = cb_fn;
+				_cb_param = cb_param;
+			}
+
+			/* wait for any prerequisite operations */
+			if (depend_tx) {
+				/* if ack is already set then we cannot be sure
+				 * we are referring to the correct operation
+				 */
+				BUG_ON(depend_tx->ack);
+				if (dma_wait_for_async_tx(depend_tx) ==
+					DMA_ERROR)
+					panic("%s: DMA_ERROR waiting for "
+						"depend_tx\n",
+						__FUNCTION__);
+			}
+
+			do_sync_xor(dest, &src_list[src_off], offset,
+				xor_src_cnt, len, local_flags, depend_tx,
+				_cb_fn, _cb_param);
+		}
+
+		/* the previous tx is hidden from the client,
+		 * so ack it
+		 */
+		if (i && depend_tx)
+			async_tx_ack(depend_tx);
+
+		depend_tx = tx;
+
+		if (src_cnt > xor_src_cnt) {
+			/* drop completed sources */
+			src_cnt -= xor_src_cnt;
+			src_off += xor_src_cnt;
+
+			/* unconditionally preserve the destination */
+			flags &= ~ASYNC_TX_XOR_ZERO_DST;
+
+			/* use the intermediate result a source, but remember
+			 * it's dropped, because it's implied, in the sync case
+			 */
+			src_list[--src_off] = dest;
+			src_cnt++;
+			flags |= ASYNC_TX_XOR_DROP_DST;
+		} else
+			src_cnt = 0;
+		i++;
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_xor);
+
+static int page_is_zero(struct page *p, unsigned int offset, size_t len)
+{
+	char *a = page_address(p) + offset;
+	return ((*(u32 *) a) == 0 &&
+		memcmp(a, a + 4, len - 4) == 0);
+}
+
+/**
+ * async_xor_zero_sum - attempt a xor parity check with a dma engine.
+ * @dest: destination page used if the xor is performed synchronously
+ * @src_list: array of source pages.  The dest page must be listed as a source
+ * 	at index zero.  The contents of this array may be overwritten.
+ * @offset: offset in pages to start transaction
+ * @src_cnt: number of source pages
+ * @len: length in bytes
+ * @result: 0 if sum == 0 else non-zero
+ * @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK
+ * @depend_tx: xor depends on the result of this transaction.
+ * @cb_fn: function to call when the xor completes
+ * @cb_param: parameter to pass to the callback routine
+ */
+struct dma_async_tx_descriptor *
+async_xor_zero_sum(struct page *dest, struct page **src_list,
+	unsigned int offset, int src_cnt, size_t len,
+	u32 *result, enum async_tx_flags flags,
+	struct dma_async_tx_descriptor *depend_tx,
+	dma_async_tx_callback cb_fn, void *cb_param)
+{
+	struct dma_chan *chan = async_tx_find_channel(depend_tx, DMA_ZERO_SUM);
+	struct dma_device *device = chan ? chan->device : NULL;
+	int int_en = cb_fn ? 1 : 0;
+	struct dma_async_tx_descriptor *tx = device ?
+		device->device_prep_dma_zero_sum(chan, src_cnt, len, result,
+			int_en) : NULL;
+	int i;
+
+	BUG_ON(src_cnt <= 1);
+
+	if (tx) {
+		dma_addr_t dma_addr;
+		enum dma_data_direction dir;
+
+		pr_debug("%s: (async) len: %zu\n", __FUNCTION__, len);
+
+		dir = (flags & ASYNC_TX_ASSUME_COHERENT) ?
+			DMA_NONE : DMA_TO_DEVICE;
+
+		for (i = 0; i < src_cnt; i++) {
+			dma_addr = dma_map_page(device->dev, src_list[i],
+				offset, len, dir);
+			tx->tx_set_src(dma_addr, tx, i);
+		}
+
+		async_tx_submit(chan, tx, flags, depend_tx, cb_fn, cb_param);
+	} else {
+		unsigned long xor_flags = flags;
+
+		pr_debug("%s: (sync) len: %zu\n", __FUNCTION__, len);
+
+		xor_flags |= ASYNC_TX_XOR_DROP_DST;
+		xor_flags &= ~ASYNC_TX_ACK;
+
+		tx = async_xor(dest, src_list, offset, src_cnt, len, xor_flags,
+			depend_tx, NULL, NULL);
+
+		if (tx) {
+			if (dma_wait_for_async_tx(tx) == DMA_ERROR)
+				panic("%s: DMA_ERROR waiting for tx\n",
+					__FUNCTION__);
+			async_tx_ack(tx);
+		}
+
+		*result = page_is_zero(dest, offset, len) ? 0 : 1;
+
+		tx = NULL;
+
+		async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
+	}
+
+	return tx;
+}
+EXPORT_SYMBOL_GPL(async_xor_zero_sum);
+
+static int __init async_xor_init(void)
+{
+	return 0;
+}
+
+static void __exit async_xor_exit(void)
+{
+	do { } while (0);
+}
+
+module_init(async_xor_init);
+module_exit(async_xor_exit);
+
+MODULE_AUTHOR("Intel Corporation");
+MODULE_DESCRIPTION("asynchronous xor/xor-zero-sum api");
+MODULE_LICENSE("GPL");

drivers/md/xor.c → crypto/xor.c

@@ -26,32 +26,32 @@
 static struct xor_block_template *active_template;
 
 void
-xor_block(unsigned int count, unsigned int bytes, void **ptr)
+xor_blocks(unsigned int src_count, unsigned int bytes, void *dest, void **srcs)
 {
-	unsigned long *p0, *p1, *p2, *p3, *p4;
+	unsigned long *p1, *p2, *p3, *p4;
 
-	p0 = (unsigned long *) ptr[0];
-	p1 = (unsigned long *) ptr[1];
-	if (count == 2) {
-		active_template->do_2(bytes, p0, p1);
+	p1 = (unsigned long *) srcs[0];
+	if (src_count == 1) {
+		active_template->do_2(bytes, dest, p1);
 		return;
 	}
 
-	p2 = (unsigned long *) ptr[2];
-	if (count == 3) {
-		active_template->do_3(bytes, p0, p1, p2);
+	p2 = (unsigned long *) srcs[1];
+	if (src_count == 2) {
+		active_template->do_3(bytes, dest, p1, p2);
 		return;
 	}
 
-	p3 = (unsigned long *) ptr[3];
-	if (count == 4) {
-		active_template->do_4(bytes, p0, p1, p2, p3);
+	p3 = (unsigned long *) srcs[2];
+	if (src_count == 3) {
+		active_template->do_4(bytes, dest, p1, p2, p3);
 		return;
 	}
 
-	p4 = (unsigned long *) ptr[4];
-	active_template->do_5(bytes, p0, p1, p2, p3, p4);
+	p4 = (unsigned long *) srcs[3];
+	active_template->do_5(bytes, dest, p1, p2, p3, p4);
 }
+EXPORT_SYMBOL(xor_blocks);
 
 /* Set of all registered templates.  */
 static struct xor_block_template *template_list;
@@ -78,7 +78,7 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
 		now = jiffies;
 		count = 0;
 		while (jiffies == now) {
-			mb();
+			mb(); /* prevent loop optimzation */
 			tmpl->do_2(BENCH_SIZE, b1, b2);
 			mb();
 			count++;
@@ -91,26 +91,26 @@ do_xor_speed(struct xor_block_template *tmpl, void *b1, void *b2)
 	speed = max * (HZ * BENCH_SIZE / 1024);
 	tmpl->speed = speed;
 
-	printk("   %-10s: %5d.%03d MB/sec\n", tmpl->name,
+	printk(KERN_INFO "   %-10s: %5d.%03d MB/sec\n", tmpl->name,
 	       speed / 1000, speed % 1000);
 }
 
-static int
-calibrate_xor_block(void)
+static int __init
+calibrate_xor_blocks(void)
 {
 	void *b1, *b2;
 	struct xor_block_template *f, *fastest;
 
 	b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
-	if (! b1) {
-		printk("raid5: Yikes!  No memory available.\n");
+	if (!b1) {
+		printk(KERN_WARNING "xor: Yikes!  No memory available.\n");
 		return -ENOMEM;
 	}
 	b2 = b1 + 2*PAGE_SIZE + BENCH_SIZE;
 
 	/*
-	 * If this arch/cpu has a short-circuited selection, don't loop through all
-	 * the possible functions, just test the best one
+	 * If this arch/cpu has a short-circuited selection, don't loop through
+	 * all the possible functions, just test the best one
 	 */
 
 	fastest = NULL;
@@ -122,11 +122,12 @@ calibrate_xor_block(void)
 #define xor_speed(templ)	do_xor_speed((templ), b1, b2)
 
 	if (fastest) {
-		printk(KERN_INFO "raid5: automatically using best checksumming function: %s\n",
+		printk(KERN_INFO "xor: automatically using best "
+			"checksumming function: %s\n",
 			fastest->name);
 		xor_speed(fastest);
 	} else {
-		printk(KERN_INFO "raid5: measuring checksumming speed\n");
+		printk(KERN_INFO "xor: measuring software checksum speed\n");
 		XOR_TRY_TEMPLATES;
 		fastest = template_list;
 		for (f = fastest; f; f = f->next)
@@ -134,7 +135,7 @@ calibrate_xor_block(void)
 				fastest = f;
 	}
 
-	printk("raid5: using function: %s (%d.%03d MB/sec)\n",
+	printk(KERN_INFO "xor: using function: %s (%d.%03d MB/sec)\n",
 	       fastest->name, fastest->speed / 1000, fastest->speed % 1000);
 
 #undef xor_speed
@@ -147,8 +148,8 @@ calibrate_xor_block(void)
 
 static __exit void xor_exit(void) { }
 
-EXPORT_SYMBOL(xor_block);
 MODULE_LICENSE("GPL");
 
-module_init(calibrate_xor_block);
+/* when built-in xor.o must initialize before drivers/md/md.o */
+core_initcall(calibrate_xor_blocks);
 module_exit(xor_exit);

drivers/dma/Kconfig

@@ -8,8 +8,8 @@ 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"
 
@@ -32,4 +32,12 @@ config INTEL_IOATDMA
 	---help---
 	  Enable support for the Intel(R) I/OAT DMA engine.
 
+config INTEL_IOP_ADMA
+        tristate "Intel IOP ADMA support"
+        depends on DMA_ENGINE && (ARCH_IOP32X || ARCH_IOP33X || ARCH_IOP13XX)
+	select ASYNC_CORE
+        default m
+        ---help---
+          Enable support for the Intel(R) IOP Series RAID engines.
+
 endmenu

drivers/dma/Makefile

 obj-$(CONFIG_DMA_ENGINE) += dmaengine.o
 obj-$(CONFIG_NET_DMA) += iovlock.o
 obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o
+obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o

drivers/dma/dmaengine.c

@@ -37,11 +37,11 @@
  * Each device has a channels list, which runs unlocked but is never modified
  * once the device is registered, it's just setup by the driver.
  *
- * Each client has a channels list, it's only modified under the client->lock
- * and in an RCU callback, so it's safe to read under rcu_read_lock().
+ * Each client is responsible for keeping track of the channels it uses.  See
+ * the definition of dma_event_callback in dmaengine.h.
  *
  * Each device has a kref, which is initialized to 1 when the device is
- * registered. A kref_put is done for each class_device registered.  When the
+ * registered. A kref_get is done for each class_device registered.  When the
  * class_device is released, the coresponding kref_put is done in the release
  * method. Every time one of the device's channels is allocated to a client,
  * a kref_get occurs.  When the channel is freed, the coresponding kref_put
@@ -51,14 +51,17 @@
  * references to finish.
  *
  * Each channel has an open-coded implementation of Rusty Russell's "bigref,"
- * with a kref and a per_cpu local_t.  A single reference is set when on an
- * ADDED event, and removed with a REMOVE event.  Net DMA client takes an
- * extra reference per outstanding transaction.  The relase function does a
- * kref_put on the device. -ChrisL
+ * with a kref and a per_cpu local_t.  A dma_chan_get is called when a client
+ * signals that it wants to use a channel, and dma_chan_put is called when
+ * a channel is removed or a client using it is unregesitered.  A client can
+ * take extra references per outstanding transaction, as is the case with
+ * the NET DMA client.  The release function does a kref_put on the device.
+ *	-ChrisL, DanW
  */
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/mm.h>
 #include <linux/device.h>
 #include <linux/dmaengine.h>
 #include <linux/hardirq.h>
@@ -66,6 +69,7 @@
 #include <linux/percpu.h>
 #include <linux/rcupdate.h>
 #include <linux/mutex.h>
+#include <linux/jiffies.h>
 
 static DEFINE_MUTEX(dma_list_mutex);
 static LIST_HEAD(dma_device_list);
@@ -100,8 +104,19 @@ static ssize_t show_bytes_transferred(struct class_device *cd, char *buf)
 static ssize_t show_in_use(struct class_device *cd, char *buf)
 {
 	struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+	int in_use = 0;
+
+	if (unlikely(chan->slow_ref) &&
+		atomic_read(&chan->refcount.refcount) > 1)
+		in_use = 1;
+	else {
+		if (local_read(&(per_cpu_ptr(chan->local,
+			get_cpu())->refcount)) > 0)
+			in_use = 1;
+		put_cpu();
+	}
 
-	return sprintf(buf, "%d\n", (chan->client ? 1 : 0));
+	return sprintf(buf, "%d\n", in_use);
 }
 
 static struct class_device_attribute dma_class_attrs[] = {
@@ -127,43 +142,72 @@ static struct class dma_devclass = {
 
 /* --- client and device registration --- */
 
+#define dma_chan_satisfies_mask(chan, mask) \
+	__dma_chan_satisfies_mask((chan), &(mask))
+static int
+__dma_chan_satisfies_mask(struct dma_chan *chan, dma_cap_mask_t *want)
+{
+	dma_cap_mask_t has;
+
+	bitmap_and(has.bits, want->bits, chan->device->cap_mask.bits,
+		DMA_TX_TYPE_END);
+	return bitmap_equal(want->bits, has.bits, DMA_TX_TYPE_END);
+}
+
 /**
- * dma_client_chan_alloc - try to allocate a channel to a client
+ * dma_client_chan_alloc - try to allocate channels to a client
  * @client: &dma_client
  *
  * Called with dma_list_mutex held.
  */
-static struct dma_chan *dma_client_chan_alloc(struct dma_client *client)
+static void dma_client_chan_alloc(struct dma_client *client)
 {
 	struct dma_device *device;
 	struct dma_chan *chan;
-	unsigned long flags;
 	int desc;	/* allocated descriptor count */
+	enum dma_state_client ack;
 
-	/* Find a channel, any DMA engine will do */
-	list_for_each_entry(device, &dma_device_list, global_node) {
+	/* Find a channel */
+	list_for_each_entry(device, &dma_device_list, global_node)
 		list_for_each_entry(chan, &device->channels, device_node) {
-			if (chan->client)
+			if (!dma_chan_satisfies_mask(chan, client->cap_mask))
 				continue;
 
 			desc = chan->device->device_alloc_chan_resources(chan);
 			if (desc >= 0) {
-				kref_get(&device->refcount);
-				kref_init(&chan->refcount);
-				chan->slow_ref = 0;
-				INIT_RCU_HEAD(&chan->rcu);
-				chan->client = client;
-				spin_lock_irqsave(&client->lock, flags);
-				list_add_tail_rcu(&chan->client_node,
-				                  &client->channels);
-				spin_unlock_irqrestore(&client->lock, flags);
-				return chan;
+				ack = client->event_callback(client,
+						chan,
+						DMA_RESOURCE_AVAILABLE);
+
+				/* we are done once this client rejects
+				 * an available resource
+				 */
+				if (ack == DMA_ACK) {
+					dma_chan_get(chan);
+					kref_get(&device->refcount);
+				} else if (ack == DMA_NAK)
+					return;
 			}
 		}
-	}
+}
+
+enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
+{
+	enum dma_status status;
+	unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
+
+	dma_async_issue_pending(chan);
+	do {
+		status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
+		if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
+			printk(KERN_ERR "dma_sync_wait_timeout!\n");
+			return DMA_ERROR;
+		}
+	} while (status == DMA_IN_PROGRESS);
 
-	return NULL;
+	return status;
 }
+EXPORT_SYMBOL(dma_sync_wait);
 
 /**
  * dma_chan_cleanup - release a DMA channel's resources
@@ -173,7 +217,6 @@ void dma_chan_cleanup(struct kref *kref)
 {
 	struct dma_chan *chan = container_of(kref, struct dma_chan, refcount);
 	chan->device->device_free_chan_resources(chan);
-	chan->client = NULL;
 	kref_put(&chan->device->refcount, dma_async_device_cleanup);
 }
 EXPORT_SYMBOL(dma_chan_cleanup);
@@ -189,7 +232,7 @@ static void dma_chan_free_rcu(struct rcu_head *rcu)
 	kref_put(&chan->refcount, dma_chan_cleanup);
 }
 
-static void dma_client_chan_free(struct dma_chan *chan)
+static void dma_chan_release(struct dma_chan *chan)
 {
 	atomic_add(0x7FFFFFFF, &chan->refcount.refcount);
 	chan->slow_ref = 1;
@@ -197,70 +240,57 @@ static void dma_client_chan_free(struct dma_chan *chan)
 }
 
 /**
- * dma_chans_rebalance - reallocate channels to clients
- *
- * When the number of DMA channel in the system changes,
- * channels need to be rebalanced among clients.
+ * dma_chans_notify_available - broadcast available channels to the clients
  */
-static void dma_chans_rebalance(void)
+static void dma_clients_notify_available(void)
 {
 	struct dma_client *client;
-	struct dma_chan *chan;
-	unsigned long flags;
 
 	mutex_lock(&dma_list_mutex);
 
-	list_for_each_entry(client, &dma_client_list, global_node) {
-		while (client->chans_desired > client->chan_count) {
-			chan = dma_client_chan_alloc(client);
-			if (!chan)
-				break;
-			client->chan_count++;
-			client->event_callback(client,
-	                                       chan,
-	                                       DMA_RESOURCE_ADDED);
-		}
-		while (client->chans_desired < client->chan_count) {
-			spin_lock_irqsave(&client->lock, flags);
-			chan = list_entry(client->channels.next,
-			                  struct dma_chan,
-			                  client_node);
-			list_del_rcu(&chan->client_node);
-			spin_unlock_irqrestore(&client->lock, flags);
-			client->chan_count--;
-			client->event_callback(client,
-			                       chan,
-			                       DMA_RESOURCE_REMOVED);
-			dma_client_chan_free(chan);
-		}
-	}
+	list_for_each_entry(client, &dma_client_list, global_node)
+		dma_client_chan_alloc(client);
 
 	mutex_unlock(&dma_list_mutex);
 }
 
 /**
- * dma_async_client_register - allocate and register a &dma_client
- * @event_callback: callback for notification of channel addition/removal
+ * dma_chans_notify_available - tell the clients that a channel is going away
+ * @chan: channel on its way out
  */
-struct dma_client *dma_async_client_register(dma_event_callback event_callback)
+static void dma_clients_notify_removed(struct dma_chan *chan)
 {
 	struct dma_client *client;
+	enum dma_state_client ack;
 
-	client = kzalloc(sizeof(*client), GFP_KERNEL);
-	if (!client)
-		return NULL;
+	mutex_lock(&dma_list_mutex);
 
-	INIT_LIST_HEAD(&client->channels);
-	spin_lock_init(&client->lock);
-	client->chans_desired = 0;
-	client->chan_count = 0;
-	client->event_callback = event_callback;
+	list_for_each_entry(client, &dma_client_list, global_node) {
+		ack = client->event_callback(client, chan,
+				DMA_RESOURCE_REMOVED);
+
+		/* client was holding resources for this channel so
+		 * free it
+		 */
+		if (ack == DMA_ACK) {
+			dma_chan_put(chan);
+			kref_put(&chan->device->refcount,
+				dma_async_device_cleanup);
+		}
+	}
 
+	mutex_unlock(&dma_list_mutex);
+}
+
+/**
+ * dma_async_client_register - register a &dma_client
+ * @client: ptr to a client structure with valid 'event_callback' and 'cap_mask'
+ */
+void dma_async_client_register(struct dma_client *client)
+{
 	mutex_lock(&dma_list_mutex);
 	list_add_tail(&client->global_node, &dma_client_list);
 	mutex_unlock(&dma_list_mutex);
-
-	return client;
 }
 EXPORT_SYMBOL(dma_async_client_register);
 
@@ -272,40 +302,42 @@ EXPORT_SYMBOL(dma_async_client_register);
  */
 void dma_async_client_unregister(struct dma_client *client)
 {
+	struct dma_device *device;
 	struct dma_chan *chan;
+	enum dma_state_client ack;
 
 	if (!client)
 		return;
 
-	rcu_read_lock();
-	list_for_each_entry_rcu(chan, &client->channels, client_node)
-		dma_client_chan_free(chan);
-	rcu_read_unlock();
-
 	mutex_lock(&dma_list_mutex);
+	/* free all channels the client is holding */
+	list_for_each_entry(device, &dma_device_list, global_node)
+		list_for_each_entry(chan, &device->channels, device_node) {
+			ack = client->event_callback(client, chan,
+				DMA_RESOURCE_REMOVED);
+
+			if (ack == DMA_ACK) {
+				dma_chan_put(chan);
+				kref_put(&chan->device->refcount,
+					dma_async_device_cleanup);
+			}
+		}
+
 	list_del(&client->global_node);
 	mutex_unlock(&dma_list_mutex);
-
-	kfree(client);
-	dma_chans_rebalance();
 }
 EXPORT_SYMBOL(dma_async_client_unregister);
 
 /**
- * dma_async_client_chan_request - request DMA channels
- * @client: &dma_client
- * @number: count of DMA channels requested
- *
- * Clients call dma_async_client_chan_request() to specify how many
- * DMA channels they need, 0 to free all currently allocated.
- * The resulting allocations/frees are indicated to the client via the
- * event callback.
+ * dma_async_client_chan_request - send all available channels to the
+ * client that satisfy the capability mask
+ * @client - requester
  */
-void dma_async_client_chan_request(struct dma_client *client,
-			unsigned int number)
+void dma_async_client_chan_request(struct dma_client *client)
 {
-	client->chans_desired = number;
-	dma_chans_rebalance();
+	mutex_lock(&dma_list_mutex);
+	dma_client_chan_alloc(client);
+	mutex_unlock(&dma_list_mutex);
 }
 EXPORT_SYMBOL(dma_async_client_chan_request);
 
@@ -316,12 +348,31 @@ EXPORT_SYMBOL(dma_async_client_chan_request);
 int dma_async_device_register(struct dma_device *device)
 {
 	static int id;
-	int chancnt = 0;
+	int chancnt = 0, rc;
 	struct dma_chan* chan;
 
 	if (!device)
 		return -ENODEV;
 
+	/* validate device routines */
+	BUG_ON(dma_has_cap(DMA_MEMCPY, device->cap_mask) &&
+		!device->device_prep_dma_memcpy);
+	BUG_ON(dma_has_cap(DMA_XOR, device->cap_mask) &&
+		!device->device_prep_dma_xor);
+	BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) &&
+		!device->device_prep_dma_zero_sum);
+	BUG_ON(dma_has_cap(DMA_MEMSET, device->cap_mask) &&
+		!device->device_prep_dma_memset);
+	BUG_ON(dma_has_cap(DMA_ZERO_SUM, device->cap_mask) &&
+		!device->device_prep_dma_interrupt);
+
+	BUG_ON(!device->device_alloc_chan_resources);
+	BUG_ON(!device->device_free_chan_resources);
+	BUG_ON(!device->device_dependency_added);
+	BUG_ON(!device->device_is_tx_complete);
+	BUG_ON(!device->device_issue_pending);
+	BUG_ON(!device->dev);
+
 	init_completion(&device->done);
 	kref_init(&device->refcount);
 	device->dev_id = id++;
@@ -338,17 +389,38 @@ int dma_async_device_register(struct dma_device *device)
 		snprintf(chan->class_dev.class_id, BUS_ID_SIZE, "dma%dchan%d",
 		         device->dev_id, chan->chan_id);
 
+		rc = class_device_register(&chan->class_dev);
+		if (rc) {
+			chancnt--;
+			free_percpu(chan->local);
+			chan->local = NULL;
+			goto err_out;
+		}
+
 		kref_get(&device->refcount);
-		class_device_register(&chan->class_dev);
+		kref_init(&chan->refcount);
+		chan->slow_ref = 0;
+		INIT_RCU_HEAD(&chan->rcu);
 	}
 
 	mutex_lock(&dma_list_mutex);
 	list_add_tail(&device->global_node, &dma_device_list);
 	mutex_unlock(&dma_list_mutex);
 
-	dma_chans_rebalance();
+	dma_clients_notify_available();
 
 	return 0;
+
+err_out:
+	list_for_each_entry(chan, &device->channels, device_node) {
+		if (chan->local == NULL)
+			continue;
+		kref_put(&device->refcount, dma_async_device_cleanup);
+		class_device_unregister(&chan->class_dev);
+		chancnt--;
+		free_percpu(chan->local);
+	}
+	return rc;
 }
 EXPORT_SYMBOL(dma_async_device_register);
 
@@ -371,32 +443,165 @@ static void dma_async_device_cleanup(struct kref *kref)
 void dma_async_device_unregister(struct dma_device *device)
 {
 	struct dma_chan *chan;
-	unsigned long flags;
 
 	mutex_lock(&dma_list_mutex);
 	list_del(&device->global_node);
 	mutex_unlock(&dma_list_mutex);
 
 	list_for_each_entry(chan, &device->channels, device_node) {
-		if (chan->client) {
-			spin_lock_irqsave(&chan->client->lock, flags);
-			list_del(&chan->client_node);
-			chan->client->chan_count--;
-			spin_unlock_irqrestore(&chan->client->lock, flags);
-			chan->client->event_callback(chan->client,
-			                             chan,
-			                             DMA_RESOURCE_REMOVED);
-			dma_client_chan_free(chan);
-		}
+		dma_clients_notify_removed(chan);
 		class_device_unregister(&chan->class_dev);
+		dma_chan_release(chan);
 	}
-	dma_chans_rebalance();
 
 	kref_put(&device->refcount, dma_async_device_cleanup);
 	wait_for_completion(&device->done);
 }
 EXPORT_SYMBOL(dma_async_device_unregister);
 
+/**
+ * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses
+ * @chan: DMA channel to offload copy to
+ * @dest: destination address (virtual)
+ * @src: source address (virtual)
+ * @len: length
+ *
+ * Both @dest and @src must be mappable to a bus address according to the
+ * DMA mapping API rules for streaming mappings.
+ * Both @dest and @src must stay memory resident (kernel memory or locked
+ * user space pages).
+ */
+dma_cookie_t
+dma_async_memcpy_buf_to_buf(struct dma_chan *chan, void *dest,
+			void *src, size_t len)
+{
+	struct dma_device *dev = chan->device;
+	struct dma_async_tx_descriptor *tx;
+	dma_addr_t addr;
+	dma_cookie_t cookie;
+	int cpu;
+
+	tx = dev->device_prep_dma_memcpy(chan, len, 0);
+	if (!tx)
+		return -ENOMEM;
+
+	tx->ack = 1;
+	tx->callback = NULL;
+	addr = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE);
+	tx->tx_set_src(addr, tx, 0);
+	addr = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE);
+	tx->tx_set_dest(addr, tx, 0);
+	cookie = tx->tx_submit(tx);
+
+	cpu = get_cpu();
+	per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+	per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+	put_cpu();
+
+	return cookie;
+}
+EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
+
+/**
+ * dma_async_memcpy_buf_to_pg - offloaded copy from address to page
+ * @chan: DMA channel to offload copy to
+ * @page: destination page
+ * @offset: offset in page to copy to
+ * @kdata: source address (virtual)
+ * @len: length
+ *
+ * Both @page/@offset and @kdata must be mappable to a bus address according
+ * to the DMA mapping API rules for streaming mappings.
+ * Both @page/@offset and @kdata must stay memory resident (kernel memory or
+ * locked user space pages)
+ */
+dma_cookie_t
+dma_async_memcpy_buf_to_pg(struct dma_chan *chan, struct page *page,
+			unsigned int offset, void *kdata, size_t len)
+{
+	struct dma_device *dev = chan->device;
+	struct dma_async_tx_descriptor *tx;
+	dma_addr_t addr;
+	dma_cookie_t cookie;
+	int cpu;
+
+	tx = dev->device_prep_dma_memcpy(chan, len, 0);
+	if (!tx)
+		return -ENOMEM;
+
+	tx->ack = 1;
+	tx->callback = NULL;
+	addr = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE);
+	tx->tx_set_src(addr, tx, 0);
+	addr = dma_map_page(dev->dev, page, offset, len, DMA_FROM_DEVICE);
+	tx->tx_set_dest(addr, tx, 0);
+	cookie = tx->tx_submit(tx);
+
+	cpu = get_cpu();
+	per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+	per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+	put_cpu();
+
+	return cookie;
+}
+EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
+
+/**
+ * dma_async_memcpy_pg_to_pg - offloaded copy from page to page
+ * @chan: DMA channel to offload copy to
+ * @dest_pg: destination page
+ * @dest_off: offset in page to copy to
+ * @src_pg: source page
+ * @src_off: offset in page to copy from
+ * @len: length
+ *
+ * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus
+ * address according to the DMA mapping API rules for streaming mappings.
+ * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident
+ * (kernel memory or locked user space pages).
+ */
+dma_cookie_t
+dma_async_memcpy_pg_to_pg(struct dma_chan *chan, struct page *dest_pg,
+	unsigned int dest_off, struct page *src_pg, unsigned int src_off,
+	size_t len)
+{
+	struct dma_device *dev = chan->device;
+	struct dma_async_tx_descriptor *tx;
+	dma_addr_t addr;
+	dma_cookie_t cookie;
+	int cpu;
+
+	tx = dev->device_prep_dma_memcpy(chan, len, 0);
+	if (!tx)
+		return -ENOMEM;
+
+	tx->ack = 1;
+	tx->callback = NULL;
+	addr = dma_map_page(dev->dev, src_pg, src_off, len, DMA_TO_DEVICE);
+	tx->tx_set_src(addr, tx, 0);
+	addr = dma_map_page(dev->dev, dest_pg, dest_off, len, DMA_FROM_DEVICE);
+	tx->tx_set_dest(addr, tx, 0);
+	cookie = tx->tx_submit(tx);
+
+	cpu = get_cpu();
+	per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
+	per_cpu_ptr(chan->local, cpu)->memcpy_count++;
+	put_cpu();
+
+	return cookie;
+}
+EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
+
+void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
+	struct dma_chan *chan)
+{
+	tx->chan = chan;
+	spin_lock_init(&tx->lock);
+	INIT_LIST_HEAD(&tx->depend_node);
+	INIT_LIST_HEAD(&tx->depend_list);
+}
+EXPORT_SYMBOL(dma_async_tx_descriptor_init);
+
 static int __init dma_bus_init(void)
 {
 	mutex_init(&dma_list_mutex);

drivers/dma/ioatdma.h

@@ -30,9 +30,6 @@
 
 #define IOAT_LOW_COMPLETION_MASK	0xffffffc0
 
-extern struct list_head dma_device_list;
-extern struct list_head dma_client_list;
-
 /**
  * struct ioat_device - internal representation of a IOAT device
  * @pdev: PCI-Express device
@@ -105,21 +102,20 @@ struct ioat_dma_chan {
 /**
  * struct ioat_desc_sw - wrapper around hardware descriptor
  * @hw: hardware DMA descriptor
- * @node:
- * @cookie:
- * @phys:
+ * @node: this descriptor will either be on the free list,
+ *     or attached to a transaction list (async_tx.tx_list)
+ * @tx_cnt: number of descriptors required to complete the transaction
+ * @async_tx: the generic software descriptor for all engines
  */
-
 struct ioat_desc_sw {
 	struct ioat_dma_descriptor *hw;
 	struct list_head node;
-	dma_cookie_t cookie;
-	dma_addr_t phys;
+	int tx_cnt;
 	DECLARE_PCI_UNMAP_ADDR(src)
 	DECLARE_PCI_UNMAP_LEN(src_len)
 	DECLARE_PCI_UNMAP_ADDR(dst)
 	DECLARE_PCI_UNMAP_LEN(dst_len)
+	struct dma_async_tx_descriptor async_tx;
 };
 
 #endif /* IOATDMA_H */
-

drivers/dma/ioatdma_io.h

-/*
- * Copyright(c) 2004 - 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.
- */
-#ifndef IOATDMA_IO_H
-#define IOATDMA_IO_H
-
-#include <asm/io.h>
-
-/*
- * device and per-channel MMIO register read and write functions
- * this is a lot of anoying inline functions, but it's typesafe
- */
-
-static inline u8 ioatdma_read8(struct ioat_device *device,
-                               unsigned int offset)
-{
-	return readb(device->reg_base + offset);
-}
-
-static inline u16 ioatdma_read16(struct ioat_device *device,
-                                 unsigned int offset)
-{
-	return readw(device->reg_base + offset);
-}
-
-static inline u32 ioatdma_read32(struct ioat_device *device,
-                                 unsigned int offset)
-{
-	return readl(device->reg_base + offset);
-}
-
-static inline void ioatdma_write8(struct ioat_device *device,
-                                  unsigned int offset, u8 value)
-{
-	writeb(value, device->reg_base + offset);
-}
-
-static inline void ioatdma_write16(struct ioat_device *device,
-                                   unsigned int offset, u16 value)
-{
-	writew(value, device->reg_base + offset);
-}
-
-static inline void ioatdma_write32(struct ioat_device *device,
-                                   unsigned int offset, u32 value)
-{
-	writel(value, device->reg_base + offset);
-}
-
-static inline u8 ioatdma_chan_read8(struct ioat_dma_chan *chan,
-                                    unsigned int offset)
-{
-	return readb(chan->reg_base + offset);
-}
-
-static inline u16 ioatdma_chan_read16(struct ioat_dma_chan *chan,
-                                      unsigned int offset)
-{
-	return readw(chan->reg_base + offset);
-}
-
-static inline u32 ioatdma_chan_read32(struct ioat_dma_chan *chan,
-                                      unsigned int offset)
-{
-	return readl(chan->reg_base + offset);
-}
-
-static inline void ioatdma_chan_write8(struct ioat_dma_chan *chan,
-                                       unsigned int offset, u8 value)
-{
-	writeb(value, chan->reg_base + offset);
-}
-
-static inline void ioatdma_chan_write16(struct ioat_dma_chan *chan,
-                                        unsigned int offset, u16 value)
-{
-	writew(value, chan->reg_base + offset);
-}
-
-static inline void ioatdma_chan_write32(struct ioat_dma_chan *chan,
-                                        unsigned int offset, u32 value)
-{
-	writel(value, chan->reg_base + offset);
-}
-
-#if (BITS_PER_LONG == 64)
-static inline u64 ioatdma_chan_read64(struct ioat_dma_chan *chan,
-                                      unsigned int offset)
-{
-	return readq(chan->reg_base + offset);
-}
-
-static inline void ioatdma_chan_write64(struct ioat_dma_chan *chan,
-                                        unsigned int offset, u64 value)
-{
-	writeq(value, chan->reg_base + offset);
-}
-#endif
-
-#endif /* IOATDMA_IO_H */
-

drivers/md/Kconfig

@@ -109,6 +109,8 @@ config MD_RAID10
 config MD_RAID456
 	tristate "RAID-4/RAID-5/RAID-6 mode"
 	depends on BLK_DEV_MD
+	select ASYNC_MEMCPY
+	select ASYNC_XOR
 	---help---
 	  A RAID-5 set of N drives with a capacity of C MB per drive provides
 	  the capacity of C * (N - 1) MB, and protects against a failure

drivers/md/Makefile

@@ -18,7 +18,7 @@ raid456-objs	:= raid5.o raid6algos.o raid6recov.o raid6tables.o \
 hostprogs-y	:= mktables
 
 # Note: link order is important.  All raid personalities
-# and xor.o must come before md.o, as they each initialise 
+# and must come before md.o, as they each initialise 
 # themselves, and md.o may use the personalities when it 
 # auto-initialised.
 
@@ -26,7 +26,7 @@ obj-$(CONFIG_MD_LINEAR)		+= linear.o
 obj-$(CONFIG_MD_RAID0)		+= raid0.o
 obj-$(CONFIG_MD_RAID1)		+= raid1.o
 obj-$(CONFIG_MD_RAID10)		+= raid10.o
-obj-$(CONFIG_MD_RAID456)	+= raid456.o xor.o
+obj-$(CONFIG_MD_RAID456)	+= raid456.o
 obj-$(CONFIG_MD_MULTIPATH)	+= multipath.o
 obj-$(CONFIG_MD_FAULTY)		+= faulty.o
 obj-$(CONFIG_BLK_DEV_MD)	+= md-mod.o

drivers/md/md.c

@@ -5814,7 +5814,7 @@ static __exit void md_exit(void)
 	}
 }
 
-module_init(md_init)
+subsys_initcall(md_init);
 module_exit(md_exit)
 
 static int get_ro(char *buffer, struct kernel_param *kp)

include/asm-arm/arch-iop13xx/iop13xx.h

@@ -166,12 +166,22 @@ static inline int iop13xx_cpu_id(void)
 #define IOP13XX_INIT_I2C_1	      (1 << 1)
 #define IOP13XX_INIT_I2C_2	      (1 << 2)
 
-#define IQ81340_NUM_UART     2
-#define IQ81340_NUM_I2C      3
-#define IQ81340_NUM_PHYS_MAP_FLASH 1
-#define IQ81340_MAX_PLAT_DEVICES (IQ81340_NUM_UART +\
-				IQ81340_NUM_I2C +\
-				IQ81340_NUM_PHYS_MAP_FLASH)
+/* ADMA selection flags */
+/* INIT_ADMA_DEFAULT = Rely on CONFIG_IOP13XX_ADMA* */
+#define IOP13XX_INIT_ADMA_DEFAULT     (0)
+#define IOP13XX_INIT_ADMA_0           (1 << 0)
+#define IOP13XX_INIT_ADMA_1           (1 << 1)
+#define IOP13XX_INIT_ADMA_2           (1 << 2)
+
+/* Platform devices */
+#define IQ81340_NUM_UART     		2
+#define IQ81340_NUM_I2C      		3
+#define IQ81340_NUM_PHYS_MAP_FLASH	1
+#define IQ81340_NUM_ADMA     		3
+#define IQ81340_MAX_PLAT_DEVICES (IQ81340_NUM_UART + \
+				IQ81340_NUM_I2C + \
+				IQ81340_NUM_PHYS_MAP_FLASH + \
+				IQ81340_NUM_ADMA)
 
 /*========================== PMMR offsets for key registers ============*/
 #define IOP13XX_ATU0_PMMR_OFFSET   	0x00048000
@@ -444,22 +454,6 @@ static inline int iop13xx_cpu_id(void)
 /*==============================ADMA UNITS===============================*/
 #define IOP13XX_ADMA_PHYS_BASE(chan)	IOP13XX_REG_ADDR32_PHYS((chan << 9))
 #define IOP13XX_ADMA_UPPER_PA(chan)	(IOP13XX_ADMA_PHYS_BASE(chan) + 0xc0)
-#define IOP13XX_ADMA_OFFSET(chan, ofs)	IOP13XX_REG_ADDR32((chan << 9) + (ofs))
-
-#define IOP13XX_ADMA_ACCR(chan)      IOP13XX_ADMA_OFFSET(chan, 0x0)
-#define IOP13XX_ADMA_ACSR(chan)      IOP13XX_ADMA_OFFSET(chan, 0x4)
-#define IOP13XX_ADMA_ADAR(chan)      IOP13XX_ADMA_OFFSET(chan, 0x8)
-#define IOP13XX_ADMA_IIPCR(chan)     IOP13XX_ADMA_OFFSET(chan, 0x18)
-#define IOP13XX_ADMA_IIPAR(chan)     IOP13XX_ADMA_OFFSET(chan, 0x1c)
-#define IOP13XX_ADMA_IIPUAR(chan)    IOP13XX_ADMA_OFFSET(chan, 0x20)
-#define IOP13XX_ADMA_ANDAR(chan)     IOP13XX_ADMA_OFFSET(chan, 0x24)
-#define IOP13XX_ADMA_ADCR(chan)      IOP13XX_ADMA_OFFSET(chan, 0x28)
-#define IOP13XX_ADMA_CARMD(chan)     IOP13XX_ADMA_OFFSET(chan, 0x2c)
-#define IOP13XX_ADMA_ABCR(chan)      IOP13XX_ADMA_OFFSET(chan, 0x30)
-#define IOP13XX_ADMA_DLADR(chan)     IOP13XX_ADMA_OFFSET(chan, 0x34)
-#define IOP13XX_ADMA_DUADR(chan)     IOP13XX_ADMA_OFFSET(chan, 0x38)
-#define IOP13XX_ADMA_SLAR(src, chan) IOP13XX_ADMA_OFFSET(chan, 0x3c + (src <<3))
-#define IOP13XX_ADMA_SUAR(src, chan) IOP13XX_ADMA_OFFSET(chan, 0x40 + (src <<3))
 
 /*==============================XSI BRIDGE===============================*/
 #define IOP13XX_XBG_BECSR		IOP13XX_REG_ADDR32(0x178c)

include/asm-arm/arch-iop32x/adma.h

+#ifndef IOP32X_ADMA_H
+#define IOP32X_ADMA_H
+#include <asm/hardware/iop3xx-adma.h>
+#endif
+

include/asm-arm/arch-iop33x/adma.h

+#ifndef IOP33X_ADMA_H
+#define IOP33X_ADMA_H
+#include <asm/hardware/iop3xx-adma.h>
+#endif
+

include/asm-arm/hardware/iop3xx.h

@@ -144,24 +144,9 @@ extern int init_atu;
 #define IOP3XX_IAR		(volatile u32 *)IOP3XX_REG_ADDR(0x0380)
 
 /* DMA Controller  */
-#define IOP3XX_DMA0_CCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0400)
-#define IOP3XX_DMA0_CSR		(volatile u32 *)IOP3XX_REG_ADDR(0x0404)
-#define IOP3XX_DMA0_DAR		(volatile u32 *)IOP3XX_REG_ADDR(0x040c)
-#define IOP3XX_DMA0_NDAR	(volatile u32 *)IOP3XX_REG_ADDR(0x0410)
-#define IOP3XX_DMA0_PADR	(volatile u32 *)IOP3XX_REG_ADDR(0x0414)
-#define IOP3XX_DMA0_PUADR	(volatile u32 *)IOP3XX_REG_ADDR(0x0418)
-#define IOP3XX_DMA0_LADR	(volatile u32 *)IOP3XX_REG_ADDR(0x041c)
-#define IOP3XX_DMA0_BCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0420)
-#define IOP3XX_DMA0_DCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0424)
-#define IOP3XX_DMA1_CCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0440)
-#define IOP3XX_DMA1_CSR		(volatile u32 *)IOP3XX_REG_ADDR(0x0444)
-#define IOP3XX_DMA1_DAR		(volatile u32 *)IOP3XX_REG_ADDR(0x044c)
-#define IOP3XX_DMA1_NDAR	(volatile u32 *)IOP3XX_REG_ADDR(0x0450)
-#define IOP3XX_DMA1_PADR	(volatile u32 *)IOP3XX_REG_ADDR(0x0454)
-#define IOP3XX_DMA1_PUADR	(volatile u32 *)IOP3XX_REG_ADDR(0x0458)
-#define IOP3XX_DMA1_LADR	(volatile u32 *)IOP3XX_REG_ADDR(0x045c)
-#define IOP3XX_DMA1_BCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0460)
-#define IOP3XX_DMA1_DCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0464)
+#define IOP3XX_DMA_PHYS_BASE(chan) (IOP3XX_PERIPHERAL_PHYS_BASE + \
+					(0x400 + (chan << 6)))
+#define IOP3XX_DMA_UPPER_PA(chan)  (IOP3XX_DMA_PHYS_BASE(chan) + 0x27)
 
 /* Peripheral bus interface  */
 #define IOP3XX_PBCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0680)
@@ -210,48 +195,8 @@ extern int init_atu;
 #define IOP_TMR_RATIO_1_1  0x00
 
 /* Application accelerator unit  */
-#define IOP3XX_AAU_ACR		(volatile u32 *)IOP3XX_REG_ADDR(0x0800)
-#define IOP3XX_AAU_ASR		(volatile u32 *)IOP3XX_REG_ADDR(0x0804)
-#define IOP3XX_AAU_ADAR		(volatile u32 *)IOP3XX_REG_ADDR(0x0808)
-#define IOP3XX_AAU_ANDAR	(volatile u32 *)IOP3XX_REG_ADDR(0x080c)
-#define IOP3XX_AAU_SAR1		(volatile u32 *)IOP3XX_REG_ADDR(0x0810)
-#define IOP3XX_AAU_SAR2		(volatile u32 *)IOP3XX_REG_ADDR(0x0814)
-#define IOP3XX_AAU_SAR3		(volatile u32 *)IOP3XX_REG_ADDR(0x0818)
-#define IOP3XX_AAU_SAR4		(volatile u32 *)IOP3XX_REG_ADDR(0x081c)
-#define IOP3XX_AAU_DAR		(volatile u32 *)IOP3XX_REG_ADDR(0x0820)
-#define IOP3XX_AAU_ABCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0824)
-#define IOP3XX_AAU_ADCR		(volatile u32 *)IOP3XX_REG_ADDR(0x0828)
-#define IOP3XX_AAU_SAR5		(volatile u32 *)IOP3XX_REG_ADDR(0x082c)
-#define IOP3XX_AAU_SAR6		(volatile u32 *)IOP3XX_REG_ADDR(0x0830)
-#define IOP3XX_AAU_SAR7		(volatile u32 *)IOP3XX_REG_ADDR(0x0834)
-#define IOP3XX_AAU_SAR8		(volatile u32 *)IOP3XX_REG_ADDR(0x0838)
-#define IOP3XX_AAU_EDCR0	(volatile u32 *)IOP3XX_REG_ADDR(0x083c)
-#define IOP3XX_AAU_SAR9		(volatile u32 *)IOP3XX_REG_ADDR(0x0840)
-#define IOP3XX_AAU_SAR10	(volatile u32 *)IOP3XX_REG_ADDR(0x0844)
-#define IOP3XX_AAU_SAR11	(volatile u32 *)IOP3XX_REG_ADDR(0x0848)
-#define IOP3XX_AAU_SAR12	(volatile u32 *)IOP3XX_REG_ADDR(0x084c)
-#define IOP3XX_AAU_SAR13	(volatile u32 *)IOP3XX_REG_ADDR(0x0850)
-#define IOP3XX_AAU_SAR14	(volatile u32 *)IOP3XX_REG_ADDR(0x0854)
-#define IOP3XX_AAU_SAR15	(volatile u32 *)IOP3XX_REG_ADDR(0x0858)
-#define IOP3XX_AAU_SAR16	(volatile u32 *)IOP3XX_REG_ADDR(0x085c)
-#define IOP3XX_AAU_EDCR1	(volatile u32 *)IOP3XX_REG_ADDR(0x0860)
-#define IOP3XX_AAU_SAR17	(volatile u32 *)IOP3XX_REG_ADDR(0x0864)
-#define IOP3XX_AAU_SAR18	(volatile u32 *)IOP3XX_REG_ADDR(0x0868)
-#define IOP3XX_AAU_SAR19	(volatile u32 *)IOP3XX_REG_ADDR(0x086c)
-#define IOP3XX_AAU_SAR20	(volatile u32 *)IOP3XX_REG_ADDR(0x0870)
-#define IOP3XX_AAU_SAR21	(volatile u32 *)IOP3XX_REG_ADDR(0x0874)
-#define IOP3XX_AAU_SAR22	(volatile u32 *)IOP3XX_REG_ADDR(0x0878)
-#define IOP3XX_AAU_SAR23	(volatile u32 *)IOP3XX_REG_ADDR(0x087c)
-#define IOP3XX_AAU_SAR24	(volatile u32 *)IOP3XX_REG_ADDR(0x0880)
-#define IOP3XX_AAU_EDCR2	(volatile u32 *)IOP3XX_REG_ADDR(0x0884)
-#define IOP3XX_AAU_SAR25	(volatile u32 *)IOP3XX_REG_ADDR(0x0888)
-#define IOP3XX_AAU_SAR26	(volatile u32 *)IOP3XX_REG_ADDR(0x088c)
-#define IOP3XX_AAU_SAR27	(volatile u32 *)IOP3XX_REG_ADDR(0x0890)
-#define IOP3XX_AAU_SAR28	(volatile u32 *)IOP3XX_REG_ADDR(0x0894)
-#define IOP3XX_AAU_SAR29	(volatile u32 *)IOP3XX_REG_ADDR(0x0898)
-#define IOP3XX_AAU_SAR30	(volatile u32 *)IOP3XX_REG_ADDR(0x089c)
-#define IOP3XX_AAU_SAR31	(volatile u32 *)IOP3XX_REG_ADDR(0x08a0)
-#define IOP3XX_AAU_SAR32	(volatile u32 *)IOP3XX_REG_ADDR(0x08a4)
+#define IOP3XX_AAU_PHYS_BASE (IOP3XX_PERIPHERAL_PHYS_BASE + 0x800)
+#define IOP3XX_AAU_UPPER_PA (IOP3XX_AAU_PHYS_BASE + 0xa7)
 
 /* I2C bus interface unit  */
 #define IOP3XX_ICR0		(volatile u32 *)IOP3XX_REG_ADDR(0x1680)
@@ -329,6 +274,9 @@ static inline void write_tisr(u32 val)
 	asm volatile("mcr p6, 0, %0, c6, c1, 0" : : "r" (val));
 }
 
+extern struct platform_device iop3xx_dma_0_channel;
+extern struct platform_device iop3xx_dma_1_channel;
+extern struct platform_device iop3xx_aau_channel;
 extern struct platform_device iop3xx_i2c0_device;
 extern struct platform_device iop3xx_i2c1_device;
 

include/asm-arm/hardware/iop_adma.h

+/*
+ * Copyright © 2006, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef IOP_ADMA_H
+#define IOP_ADMA_H
+#include <linux/types.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+
+#define IOP_ADMA_SLOT_SIZE 32
+#define IOP_ADMA_THRESHOLD 4
+
+/**
+ * struct iop_adma_device - internal representation of an ADMA device
+ * @pdev: Platform device
+ * @id: HW ADMA Device selector
+ * @dma_desc_pool: base of DMA descriptor region (DMA address)
+ * @dma_desc_pool_virt: base of DMA descriptor region (CPU address)
+ * @common: embedded struct dma_device
+ */
+struct iop_adma_device {
+	struct platform_device *pdev;
+	int id;
+	dma_addr_t dma_desc_pool;
+	void *dma_desc_pool_virt;
+	struct dma_device common;
+};
+
+/**
+ * struct iop_adma_chan - internal representation of an ADMA device
+ * @pending: allows batching of hardware operations
+ * @completed_cookie: identifier for the most recently completed operation
+ * @lock: serializes enqueue/dequeue operations to the slot pool
+ * @mmr_base: memory mapped register base
+ * @chain: device chain view of the descriptors
+ * @device: parent device
+ * @common: common dmaengine channel object members
+ * @last_used: place holder for allocation to continue from where it left off
+ * @all_slots: complete domain of slots usable by the channel
+ * @cleanup_watchdog: workaround missed interrupts on iop3xx
+ * @slots_allocated: records the actual size of the descriptor slot pool
+ * @irq_tasklet: bottom half where iop_adma_slot_cleanup runs
+ */
+struct iop_adma_chan {
+	int pending;
+	dma_cookie_t completed_cookie;
+	spinlock_t lock; /* protects the descriptor slot pool */
+	void __iomem *mmr_base;
+	struct list_head chain;
+	struct iop_adma_device *device;
+	struct dma_chan common;
+	struct iop_adma_desc_slot *last_used;
+	struct list_head all_slots;
+	struct timer_list cleanup_watchdog;
+	int slots_allocated;
+	struct tasklet_struct irq_tasklet;
+};
+
+/**
+ * struct iop_adma_desc_slot - IOP-ADMA software descriptor
+ * @slot_node: node on the iop_adma_chan.all_slots list
+ * @chain_node: node on the op_adma_chan.chain list
+ * @hw_desc: virtual address of the hardware descriptor chain
+ * @phys: hardware address of the hardware descriptor chain
+ * @group_head: first operation in a transaction
+ * @slot_cnt: total slots used in an transaction (group of operations)
+ * @slots_per_op: number of slots per operation
+ * @idx: pool index
+ * @unmap_src_cnt: number of xor sources
+ * @unmap_len: transaction bytecount
+ * @async_tx: support for the async_tx api
+ * @group_list: list of slots that make up a multi-descriptor transaction
+ *	for example transfer lengths larger than the supported hw max
+ * @xor_check_result: result of zero sum
+ * @crc32_result: result crc calculation
+ */
+struct iop_adma_desc_slot {
+	struct list_head slot_node;
+	struct list_head chain_node;
+	void *hw_desc;
+	struct iop_adma_desc_slot *group_head;
+	u16 slot_cnt;
+	u16 slots_per_op;
+	u16 idx;
+	u16 unmap_src_cnt;
+	size_t unmap_len;
+	struct dma_async_tx_descriptor async_tx;
+	union {
+		u32 *xor_check_result;
+		u32 *crc32_result;
+	};
+};
+
+struct iop_adma_platform_data {
+	int hw_id;
+	dma_cap_mask_t cap_mask;
+	size_t pool_size;
+};
+
+#define to_iop_sw_desc(addr_hw_desc) \
+	container_of(addr_hw_desc, struct iop_adma_desc_slot, hw_desc)
+#define iop_hw_desc_slot_idx(hw_desc, idx) \
+	( (void *) (((unsigned long) hw_desc) + ((idx) << 5)) )
+#endif

include/linux/pci_ids.h

@@ -479,6 +479,9 @@
 #define PCI_DEVICE_ID_IBM_ICOM_V2_ONE_PORT_RVX_ONE_PORT_MDM_PCIE 0x0361
 #define PCI_DEVICE_ID_IBM_ICOM_FOUR_PORT_MODEL	0x252
 
+#define PCI_VENDOR_ID_UNISYS		0x1018
+#define PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR 0x001C
+
 #define PCI_VENDOR_ID_COMPEX2		0x101a /* pci.ids says "AT&T GIS (NCR)" */
 #define PCI_DEVICE_ID_COMPEX2_100VG	0x0005
 

include/linux/raid/xor.h

@@ -3,9 +3,10 @@
 
 #include <linux/raid/md.h>
 
-#define MAX_XOR_BLOCKS 5
+#define MAX_XOR_BLOCKS 4
 
-extern void xor_block(unsigned int count, unsigned int bytes, void **ptr);
+extern void xor_blocks(unsigned int count, unsigned int bytes,
+	void *dest, void **srcs);
 
 struct xor_block_template {
         struct xor_block_template *next;

net/ipv4/tcp.c

@@ -1116,6 +1116,7 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 	long timeo;
 	struct task_struct *user_recv = NULL;
 	int copied_early = 0;
+	struct sk_buff *skb;
 
 	lock_sock(sk);
 
@@ -1142,16 +1143,26 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 #ifdef CONFIG_NET_DMA
 	tp->ucopy.dma_chan = NULL;
 	preempt_disable();
-	if ((len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) &&
-	    !sysctl_tcp_low_latency && __get_cpu_var(softnet_data).net_dma) {
-		preempt_enable_no_resched();
-		tp->ucopy.pinned_list = dma_pin_iovec_pages(msg->msg_iov, len);
-	} else
-		preempt_enable_no_resched();
+	skb = skb_peek_tail(&sk->sk_receive_queue);
+	{
+		int available = 0;
+
+		if (skb)
+			available = TCP_SKB_CB(skb)->seq + skb->len - (*seq);
+		if ((available < target) &&
+		    (len > sysctl_tcp_dma_copybreak) && !(flags & MSG_PEEK) &&
+		    !sysctl_tcp_low_latency &&
+		    __get_cpu_var(softnet_data).net_dma) {
+			preempt_enable_no_resched();
+			tp->ucopy.pinned_list =
+					dma_pin_iovec_pages(msg->msg_iov, len);
+		} else {
+			preempt_enable_no_resched();
+		}
+	}
 #endif
 
 	do {
-		struct sk_buff *skb;
 		u32 offset;
 
 		/* Are we at urgent data? Stop if we have read anything or have SIGURG pending. */
@@ -1439,7 +1450,6 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 
 #ifdef CONFIG_NET_DMA
 	if (tp->ucopy.dma_chan) {
-		struct sk_buff *skb;
 		dma_cookie_t done, used;
 
 		dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);