Patchwork [U-Boot,v6] usb: align buffers at cacheline

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Submitter Puneet Saxena
Date March 5, 2012, 7:27 a.m.
Message ID <1330932423-23993-1-git-send-email-puneets@nvidia.com>
Download mbox | patch
Permalink /patch/144613/
State Superseded
Delegated to: Marek Vasut
Headers show

Comments

Puneet Saxena - March 5, 2012, 7:27 a.m.
As DMA expects the buffers to be equal and larger then
cache lines, This aligns buffers at cacheline.

Signed-off-by: Puneet Saxena <puneets@nvidia.com>
---

Changes for V5:
    - Aligned "usb_device_descriptor" using ARCH_DMA_MINALIGN

Changes for V6: 
    - Cosmetic changes.

 common/cmd_usb.c            |    3 +-
 common/usb.c                |   54 ++++++++++++++++++++++-----------------
 common/usb_storage.c        |   59 ++++++++++++++++++++----------------------
 disk/part_dos.c             |    2 +-
 drivers/usb/host/ehci-hcd.c |    8 ++++++
 include/scsi.h              |    4 ++-
 include/usb.h               |    4 ++-
 7 files changed, 75 insertions(+), 59 deletions(-)
Marek Vasut - March 5, 2012, 12:03 p.m.
Dear Puneet Saxena,

> As DMA expects the buffers to be equal and larger then
> cache lines, This aligns buffers at cacheline.
> 
> Signed-off-by: Puneet Saxena <puneets@nvidia.com>
> ---
> 
> Changes for V5:
>     - Aligned "usb_device_descriptor" using ARCH_DMA_MINALIGN
> 
> Changes for V6:
>     - Cosmetic changes.
> 
>  common/cmd_usb.c            |    3 +-
>  common/usb.c                |   54 ++++++++++++++++++++++-----------------
>  common/usb_storage.c        |   59
> ++++++++++++++++++++---------------------- disk/part_dos.c             |  
>  2 +-
>  drivers/usb/host/ehci-hcd.c |    8 ++++++
>  include/scsi.h              |    4 ++-
>  include/usb.h               |    4 ++-
>  7 files changed, 75 insertions(+), 59 deletions(-)
> 
> diff --git a/common/cmd_usb.c b/common/cmd_usb.c
> index 320667f..bca9d94 100644
> --- a/common/cmd_usb.c
> +++ b/common/cmd_usb.c
> @@ -150,7 +150,8 @@ void usb_display_class_sub(unsigned char dclass,
> unsigned char subclass,
> 
>  void usb_display_string(struct usb_device *dev, int index)
>  {
> -	char buffer[256];
> +	ALLOC_CACHE_ALIGN_BUFFER(char, buffer, 256);
> +
>  	if (index != 0) {
>  		if (usb_string(dev, index, &buffer[0], 256) > 0)
>  			printf("String: \"%s\"", buffer);
> diff --git a/common/usb.c b/common/usb.c
> index 6e21ae2..3005012 100644
> --- a/common/usb.c
> +++ b/common/usb.c
> @@ -73,7 +73,6 @@ static struct usb_device usb_dev[USB_MAX_DEVICE];
>  static int dev_index;
>  static int running;
>  static int asynch_allowed;
> -static struct devrequest setup_packet;
> 
>  char usb_started; /* flag for the started/stopped USB status */
> 
> @@ -185,23 +184,25 @@ int usb_control_msg(struct usb_device *dev, unsigned
> int pipe, unsigned short value, unsigned short index,
>  			void *data, unsigned short size, int timeout)
>  {
> +	ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet,
> +		sizeof(struct devrequest));
>  	if ((timeout == 0) && (!asynch_allowed)) {
>  		/* request for a asynch control pipe is not allowed */
>  		return -1;
>  	}
> 
>  	/* set setup command */
> -	setup_packet.requesttype = requesttype;
> -	setup_packet.request = request;
> -	setup_packet.value = cpu_to_le16(value);
> -	setup_packet.index = cpu_to_le16(index);
> -	setup_packet.length = cpu_to_le16(size);
> +	setup_packet->requesttype = requesttype;
> +	setup_packet->request = request;
> +	setup_packet->value = cpu_to_le16(value);
> +	setup_packet->index = cpu_to_le16(index);
> +	setup_packet->length = cpu_to_le16(size);
>  	USB_PRINTF("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
>  		   "value 0x%X index 0x%X length 0x%X\n",
>  		   request, requesttype, value, index, size);
>  	dev->status = USB_ST_NOT_PROC; /*not yet processed */
> 
> -	submit_control_msg(dev, pipe, data, size, &setup_packet);
> +	submit_control_msg(dev, pipe, data, size, setup_packet);
>  	if (timeout == 0)
>  		return (int)size;
> 
> @@ -698,7 +699,7 @@ static int usb_string_sub(struct usb_device *dev,
> unsigned int langid, */
>  int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
>  {
> -	unsigned char mybuf[USB_BUFSIZ];
> +	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
>  	unsigned char *tbuf;
>  	int err;
>  	unsigned int u, idx;
> @@ -798,7 +799,7 @@ int usb_new_device(struct usb_device *dev)
>  {
>  	int addr, err;
>  	int tmp;
> -	unsigned char tmpbuf[USB_BUFSIZ];
> +	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
> 
>  	/* We still haven't set the Address yet */
>  	addr = dev->devnum;
> @@ -919,14 +920,18 @@ int usb_new_device(struct usb_device *dev)
>  				"(expected %i, got %i)\n", tmp, err);
>  		return 1;
>  	}
> +
> +	/* Now copy the local device descriptor to global device descriptor*/
> +	memcpy(&dev->descriptor, desc, sizeof(dev->descriptor));
> +

Why is this memcpy() here? Didn't we finally decide to align the global 
descriptor so this is unnecessary?

The rest of the patch is perfect, I'm looking forward to testing it. :-)

Best regards,
Marek Vasut

Patch

diff --git a/common/cmd_usb.c b/common/cmd_usb.c
index 320667f..bca9d94 100644
--- a/common/cmd_usb.c
+++ b/common/cmd_usb.c
@@ -150,7 +150,8 @@  void usb_display_class_sub(unsigned char dclass, unsigned char subclass,
 
 void usb_display_string(struct usb_device *dev, int index)
 {
-	char buffer[256];
+	ALLOC_CACHE_ALIGN_BUFFER(char, buffer, 256);
+
 	if (index != 0) {
 		if (usb_string(dev, index, &buffer[0], 256) > 0)
 			printf("String: \"%s\"", buffer);
diff --git a/common/usb.c b/common/usb.c
index 6e21ae2..3005012 100644
--- a/common/usb.c
+++ b/common/usb.c
@@ -73,7 +73,6 @@  static struct usb_device usb_dev[USB_MAX_DEVICE];
 static int dev_index;
 static int running;
 static int asynch_allowed;
-static struct devrequest setup_packet;
 
 char usb_started; /* flag for the started/stopped USB status */
 
@@ -185,23 +184,25 @@  int usb_control_msg(struct usb_device *dev, unsigned int pipe,
 			unsigned short value, unsigned short index,
 			void *data, unsigned short size, int timeout)
 {
+	ALLOC_CACHE_ALIGN_BUFFER(struct devrequest, setup_packet,
+		sizeof(struct devrequest));
 	if ((timeout == 0) && (!asynch_allowed)) {
 		/* request for a asynch control pipe is not allowed */
 		return -1;
 	}
 
 	/* set setup command */
-	setup_packet.requesttype = requesttype;
-	setup_packet.request = request;
-	setup_packet.value = cpu_to_le16(value);
-	setup_packet.index = cpu_to_le16(index);
-	setup_packet.length = cpu_to_le16(size);
+	setup_packet->requesttype = requesttype;
+	setup_packet->request = request;
+	setup_packet->value = cpu_to_le16(value);
+	setup_packet->index = cpu_to_le16(index);
+	setup_packet->length = cpu_to_le16(size);
 	USB_PRINTF("usb_control_msg: request: 0x%X, requesttype: 0x%X, " \
 		   "value 0x%X index 0x%X length 0x%X\n",
 		   request, requesttype, value, index, size);
 	dev->status = USB_ST_NOT_PROC; /*not yet processed */
 
-	submit_control_msg(dev, pipe, data, size, &setup_packet);
+	submit_control_msg(dev, pipe, data, size, setup_packet);
 	if (timeout == 0)
 		return (int)size;
 
@@ -698,7 +699,7 @@  static int usb_string_sub(struct usb_device *dev, unsigned int langid,
  */
 int usb_string(struct usb_device *dev, int index, char *buf, size_t size)
 {
-	unsigned char mybuf[USB_BUFSIZ];
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, mybuf, USB_BUFSIZ);
 	unsigned char *tbuf;
 	int err;
 	unsigned int u, idx;
@@ -798,7 +799,7 @@  int usb_new_device(struct usb_device *dev)
 {
 	int addr, err;
 	int tmp;
-	unsigned char tmpbuf[USB_BUFSIZ];
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, tmpbuf, USB_BUFSIZ);
 
 	/* We still haven't set the Address yet */
 	addr = dev->devnum;
@@ -919,14 +920,18 @@  int usb_new_device(struct usb_device *dev)
 				"(expected %i, got %i)\n", tmp, err);
 		return 1;
 	}
+
+	/* Now copy the local device descriptor to global device descriptor*/
+	memcpy(&dev->descriptor, desc, sizeof(dev->descriptor));
+
 	/* correct le values */
 	le16_to_cpus(&dev->descriptor.bcdUSB);
 	le16_to_cpus(&dev->descriptor.idVendor);
 	le16_to_cpus(&dev->descriptor.idProduct);
 	le16_to_cpus(&dev->descriptor.bcdDevice);
 	/* only support for one config for now */
-	usb_get_configuration_no(dev, &tmpbuf[0], 0);
-	usb_parse_config(dev, &tmpbuf[0], 0);
+	usb_get_configuration_no(dev, tmpbuf, 0);
+	usb_parse_config(dev, tmpbuf, 0);
 	usb_set_maxpacket(dev);
 	/* we set the default configuration here */
 	if (usb_set_configuration(dev, dev->config.desc.bConfigurationValue)) {
@@ -1080,7 +1085,7 @@  static int hub_port_reset(struct usb_device *dev, int port,
 			unsigned short *portstat)
 {
 	int tries;
-	struct usb_port_status portsts;
+	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 	unsigned short portstatus, portchange;
 
 	USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
@@ -1089,13 +1094,13 @@  static int hub_port_reset(struct usb_device *dev, int port,
 		usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
 		wait_ms(200);
 
-		if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
+		if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 			USB_HUB_PRINTF("get_port_status failed status %lX\n",
 					dev->status);
 			return -1;
 		}
-		portstatus = le16_to_cpu(portsts.wPortStatus);
-		portchange = le16_to_cpu(portsts.wPortChange);
+		portstatus = le16_to_cpu(portsts->wPortStatus);
+		portchange = le16_to_cpu(portsts->wPortChange);
 
 		USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
 				portstatus, portchange,
@@ -1133,19 +1138,19 @@  static int hub_port_reset(struct usb_device *dev, int port,
 void usb_hub_port_connect_change(struct usb_device *dev, int port)
 {
 	struct usb_device *usb;
-	struct usb_port_status portsts;
+	ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 	unsigned short portstatus;
 
 	/* Check status */
-	if (usb_get_port_status(dev, port + 1, &portsts) < 0) {
+	if (usb_get_port_status(dev, port + 1, portsts) < 0) {
 		USB_HUB_PRINTF("get_port_status failed\n");
 		return;
 	}
 
-	portstatus = le16_to_cpu(portsts.wPortStatus);
+	portstatus = le16_to_cpu(portsts->wPortStatus);
 	USB_HUB_PRINTF("portstatus %x, change %x, %s\n",
 			portstatus,
-			le16_to_cpu(portsts.wPortChange),
+			le16_to_cpu(portsts->wPortChange),
 			portspeed(portstatus));
 
 	/* Clear the connection change status */
@@ -1194,7 +1199,8 @@  void usb_hub_port_connect_change(struct usb_device *dev, int port)
 int usb_hub_configure(struct usb_device *dev)
 {
 	int i;
-	unsigned char buffer[USB_BUFSIZ], *bitmap;
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, USB_BUFSIZ);
+	unsigned char *bitmap;
 	struct usb_hub_descriptor *descriptor;
 	struct usb_hub_device *hub;
 #ifdef USB_HUB_DEBUG
@@ -1316,16 +1322,16 @@  int usb_hub_configure(struct usb_device *dev)
 	usb_hub_power_on(hub);
 
 	for (i = 0; i < dev->maxchild; i++) {
-		struct usb_port_status portsts;
+		ALLOC_CACHE_ALIGN_BUFFER(struct usb_port_status, portsts, 1);
 		unsigned short portstatus, portchange;
 
-		if (usb_get_port_status(dev, i + 1, &portsts) < 0) {
+		if (usb_get_port_status(dev, i + 1, portsts) < 0) {
 			USB_HUB_PRINTF("get_port_status failed\n");
 			continue;
 		}
 
-		portstatus = le16_to_cpu(portsts.wPortStatus);
-		portchange = le16_to_cpu(portsts.wPortChange);
+		portstatus = le16_to_cpu(portsts->wPortStatus);
+		portchange = le16_to_cpu(portsts->wPortChange);
 		USB_HUB_PRINTF("Port %d Status %X Change %X\n",
 				i + 1, portstatus, portchange);
 
diff --git a/common/usb_storage.c b/common/usb_storage.c
index de84c8d..88ca390 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -79,8 +79,7 @@  static const unsigned char us_direction[256/8] = {
 };
 #define US_DIRECTION(x) ((us_direction[x>>3] >> (x & 7)) & 1)
 
-static unsigned char usb_stor_buf[512];
-static ccb usb_ccb;
+static ccb usb_ccb __attribute__((aligned(ARCH_DMA_MINALIGN)));
 
 /*
  * CBI style
@@ -210,17 +209,17 @@  int usb_stor_info(void)
 static unsigned int usb_get_max_lun(struct us_data *us)
 {
 	int len;
-	unsigned char result;
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, result, 1);
 	len = usb_control_msg(us->pusb_dev,
 			      usb_rcvctrlpipe(us->pusb_dev, 0),
 			      US_BBB_GET_MAX_LUN,
 			      USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
 			      0, us->ifnum,
-			      &result, sizeof(result),
+			      result, sizeof(char),
 			      USB_CNTL_TIMEOUT * 5);
 	USB_STOR_PRINTF("Get Max LUN -> len = %i, result = %i\n",
-			len, (int) result);
-	return (len > 0) ? result : 0;
+			len, (int) *result);
+	return (len > 0) ? *result : 0;
 }
 
 /*******************************************************************************
@@ -233,9 +232,6 @@  int usb_stor_scan(int mode)
 	unsigned char i;
 	struct usb_device *dev;
 
-	/* GJ */
-	memset(usb_stor_buf, 0, sizeof(usb_stor_buf));
-
 	if (mode == 1)
 		printf("       scanning bus for storage devices... ");
 
@@ -499,7 +495,7 @@  int usb_stor_BBB_comdat(ccb *srb, struct us_data *us)
 	int actlen;
 	int dir_in;
 	unsigned int pipe;
-	umass_bbb_cbw_t cbw;
+	ALLOC_CACHE_ALIGN_BUFFER(umass_bbb_cbw_t, cbw, 1);
 
 	dir_in = US_DIRECTION(srb->cmd[0]);
 
@@ -522,16 +518,16 @@  int usb_stor_BBB_comdat(ccb *srb, struct us_data *us)
 	/* always OUT to the ep */
 	pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
 
-	cbw.dCBWSignature = cpu_to_le32(CBWSIGNATURE);
-	cbw.dCBWTag = cpu_to_le32(CBWTag++);
-	cbw.dCBWDataTransferLength = cpu_to_le32(srb->datalen);
-	cbw.bCBWFlags = (dir_in ? CBWFLAGS_IN : CBWFLAGS_OUT);
-	cbw.bCBWLUN = srb->lun;
-	cbw.bCDBLength = srb->cmdlen;
+	cbw->dCBWSignature = cpu_to_le32(CBWSIGNATURE);
+	cbw->dCBWTag = cpu_to_le32(CBWTag++);
+	cbw->dCBWDataTransferLength = cpu_to_le32(srb->datalen);
+	cbw->bCBWFlags = (dir_in ? CBWFLAGS_IN : CBWFLAGS_OUT);
+	cbw->bCBWLUN = srb->lun;
+	cbw->bCDBLength = srb->cmdlen;
 	/* copy the command data into the CBW command data buffer */
 	/* DST SRC LEN!!! */
-	memcpy(cbw.CBWCDB, srb->cmd, srb->cmdlen);
-	result = usb_bulk_msg(us->pusb_dev, pipe, &cbw, UMASS_BBB_CBW_SIZE,
+	memcpy(cbw->CBWCDB, srb->cmd, srb->cmdlen);
+	result = usb_bulk_msg(us->pusb_dev, pipe, cbw, UMASS_BBB_CBW_SIZE,
 			      &actlen, USB_CNTL_TIMEOUT * 5);
 	if (result < 0)
 		USB_STOR_PRINTF("usb_stor_BBB_comdat:usb_bulk_msg error\n");
@@ -675,7 +671,7 @@  int usb_stor_BBB_transport(ccb *srb, struct us_data *us)
 	int dir_in;
 	int actlen, data_actlen;
 	unsigned int pipe, pipein, pipeout;
-	umass_bbb_csw_t csw;
+	ALLOC_CACHE_ALIGN_BUFFER(umass_bbb_csw_t, csw, 1);
 #ifdef BBB_XPORT_TRACE
 	unsigned char *ptr;
 	int index;
@@ -733,7 +729,7 @@  st:
 	retry = 0;
 again:
 	USB_STOR_PRINTF("STATUS phase\n");
-	result = usb_bulk_msg(us->pusb_dev, pipein, &csw, UMASS_BBB_CSW_SIZE,
+	result = usb_bulk_msg(us->pusb_dev, pipein, csw, UMASS_BBB_CSW_SIZE,
 				&actlen, USB_CNTL_TIMEOUT*5);
 
 	/* special handling of STALL in STATUS phase */
@@ -753,28 +749,28 @@  again:
 		return USB_STOR_TRANSPORT_FAILED;
 	}
 #ifdef BBB_XPORT_TRACE
-	ptr = (unsigned char *)&csw;
+	ptr = (unsigned char *)csw;
 	for (index = 0; index < UMASS_BBB_CSW_SIZE; index++)
 		printf("ptr[%d] %#x ", index, ptr[index]);
 	printf("\n");
 #endif
 	/* misuse pipe to get the residue */
-	pipe = le32_to_cpu(csw.dCSWDataResidue);
+	pipe = le32_to_cpu(csw->dCSWDataResidue);
 	if (pipe == 0 && srb->datalen != 0 && srb->datalen - data_actlen != 0)
 		pipe = srb->datalen - data_actlen;
-	if (CSWSIGNATURE != le32_to_cpu(csw.dCSWSignature)) {
+	if (CSWSIGNATURE != le32_to_cpu(csw->dCSWSignature)) {
 		USB_STOR_PRINTF("!CSWSIGNATURE\n");
 		usb_stor_BBB_reset(us);
 		return USB_STOR_TRANSPORT_FAILED;
-	} else if ((CBWTag - 1) != le32_to_cpu(csw.dCSWTag)) {
+	} else if ((CBWTag - 1) != le32_to_cpu(csw->dCSWTag)) {
 		USB_STOR_PRINTF("!Tag\n");
 		usb_stor_BBB_reset(us);
 		return USB_STOR_TRANSPORT_FAILED;
-	} else if (csw.bCSWStatus > CSWSTATUS_PHASE) {
+	} else if (csw->bCSWStatus > CSWSTATUS_PHASE) {
 		USB_STOR_PRINTF(">PHASE\n");
 		usb_stor_BBB_reset(us);
 		return USB_STOR_TRANSPORT_FAILED;
-	} else if (csw.bCSWStatus == CSWSTATUS_PHASE) {
+	} else if (csw->bCSWStatus == CSWSTATUS_PHASE) {
 		USB_STOR_PRINTF("=PHASE\n");
 		usb_stor_BBB_reset(us);
 		return USB_STOR_TRANSPORT_FAILED;
@@ -782,7 +778,7 @@  again:
 		USB_STOR_PRINTF("transferred %dB instead of %ldB\n",
 			data_actlen, srb->datalen);
 		return USB_STOR_TRANSPORT_FAILED;
-	} else if (csw.bCSWStatus == CSWSTATUS_FAILED) {
+	} else if (csw->bCSWStatus == CSWSTATUS_FAILED) {
 		USB_STOR_PRINTF("FAILED\n");
 		return USB_STOR_TRANSPORT_FAILED;
 	}
@@ -1343,7 +1339,8 @@  int usb_stor_get_info(struct usb_device *dev, struct us_data *ss,
 		      block_dev_desc_t *dev_desc)
 {
 	unsigned char perq, modi;
-	unsigned long cap[2];
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned long, cap, 2);
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, usb_stor_buf, 36);
 	unsigned long *capacity, *blksz;
 	ccb *pccb = &usb_ccb;
 
@@ -1367,9 +1364,9 @@  int usb_stor_get_info(struct usb_device *dev, struct us_data *ss,
 		/* drive is removable */
 		dev_desc->removable = 1;
 	}
-	memcpy(&dev_desc->vendor[0], &usb_stor_buf[8], 8);
-	memcpy(&dev_desc->product[0], &usb_stor_buf[16], 16);
-	memcpy(&dev_desc->revision[0], &usb_stor_buf[32], 4);
+	memcpy(&dev_desc->vendor[0], (const void *) &usb_stor_buf[8], 8);
+	memcpy(&dev_desc->product[0], (const void *) &usb_stor_buf[16], 16);
+	memcpy(&dev_desc->revision[0], (const void *) &usb_stor_buf[32], 4);
 	dev_desc->vendor[8] = 0;
 	dev_desc->product[16] = 0;
 	dev_desc->revision[4] = 0;
diff --git a/disk/part_dos.c b/disk/part_dos.c
index b5bcb37..70211ee 100644
--- a/disk/part_dos.c
+++ b/disk/part_dos.c
@@ -87,7 +87,7 @@  static int test_block_type(unsigned char *buffer)
 
 int test_part_dos (block_dev_desc_t *dev_desc)
 {
-	unsigned char buffer[dev_desc->blksz];
+	ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
 
 	if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||
 	    (buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index d893b2a..eb5220b 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -120,6 +120,14 @@  static struct descriptor {
  */
 static void flush_invalidate(u32 addr, int size, int flush)
 {
+	/*
+	 * Size is the bytes actually moved during transaction,
+	 * which may not equal to the cache line. This results
+	 * stop address passed for invalidating cache may not be aligned.
+	 * Therfore making size as multiple of cache line size.
+	 */
+	size = ALIGN(size, ARCH_DMA_MINALIGN);
+
 	if (flush)
 		flush_dcache_range(addr, addr + size);
 	else
diff --git a/include/scsi.h b/include/scsi.h
index c52759c..89ae45f 100644
--- a/include/scsi.h
+++ b/include/scsi.h
@@ -26,7 +26,9 @@ 
 
 typedef struct SCSI_cmd_block{
 	unsigned char		cmd[16];					/* command				   */
-	unsigned char		sense_buf[64];		/* for request sense */
+	/* for request sense */
+	unsigned char		sense_buf[64]
+		__attribute__((aligned(ARCH_DMA_MINALIGN)));
 	unsigned char		status;						/* SCSI Status			 */
 	unsigned char		target;						/* Target ID				 */
 	unsigned char		lun;							/* Target LUN        */
diff --git a/include/usb.h b/include/usb.h
index 06170cd..5f4f110 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -109,7 +109,9 @@  struct usb_device {
 	int epmaxpacketout[16];		/* OUTput endpoint specific maximums */
 
 	int configno;			/* selected config number */
-	struct usb_device_descriptor descriptor; /* Device Descriptor */
+	/* Device Descriptor */
+	struct usb_device_descriptor descriptor
+		__attribute__((aligned(ARCH_DMA_MINALIGN)));
 	struct usb_config config; /* config descriptor */
 
 	int have_langid;		/* whether string_langid is valid yet */