drivers/s390/cio/fcx.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  *  Functions for assembling fcx enabled I/O control blocks.
  *
  *    Copyright IBM Corp. 2008
  *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
  */

 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <asm/fcx.h>
 #include "cio.h"

 /**
  * tcw_get_intrg - return pointer to associated interrogate tcw
  * @tcw: pointer to the original tcw
  *
  * Return a pointer to the interrogate tcw associated with the specified tcw
  * or %NULL if there is no associated interrogate tcw.
  */
 struct tcw *tcw_get_intrg(struct tcw *tcw)
 {
 	return (struct tcw *) ((addr_t) tcw->intrg);
 }
 EXPORT_SYMBOL(tcw_get_intrg);

 /**
  * tcw_get_data - return pointer to input/output data associated with tcw
  * @tcw: pointer to the tcw
  *
  * Return the input or output data address specified in the tcw depending
  * on whether the r-bit or the w-bit is set. If neither bit is set, return
  * %NULL.
  */
 void *tcw_get_data(struct tcw *tcw)
 {
 	if (tcw->r)
 		return (void *) ((addr_t) tcw->input);
 	if (tcw->w)
 		return (void *) ((addr_t) tcw->output);
 	return NULL;
 }
 EXPORT_SYMBOL(tcw_get_data);

 /**
  * tcw_get_tccb - return pointer to tccb associated with tcw
  * @tcw: pointer to the tcw
  *
  * Return pointer to the tccb associated with this tcw.
  */
 struct tccb *tcw_get_tccb(struct tcw *tcw)
 {
 	return (struct tccb *) ((addr_t) tcw->tccb);
 }
 EXPORT_SYMBOL(tcw_get_tccb);

 /**
  * tcw_get_tsb - return pointer to tsb associated with tcw
  * @tcw: pointer to the tcw
  *
  * Return pointer to the tsb associated with this tcw.
  */
 struct tsb *tcw_get_tsb(struct tcw *tcw)
 {
 	return (struct tsb *) ((addr_t) tcw->tsb);
 }
 EXPORT_SYMBOL(tcw_get_tsb);

 /**
  * tcw_init - initialize tcw data structure
  * @tcw: pointer to the tcw to be initialized
  * @r: initial value of the r-bit
  * @w: initial value of the w-bit
  *
  * Initialize all fields of the specified tcw data structure with zero and
  * fill in the format, flags, r and w fields.
  */
 void tcw_init(struct tcw *tcw, int r, int w)
 {
 	memset(tcw, 0, sizeof(struct tcw));
 	tcw->format = TCW_FORMAT_DEFAULT;
 	tcw->flags = TCW_FLAGS_TIDAW_FORMAT(TCW_TIDAW_FORMAT_DEFAULT);
 	if (r)
 		tcw->r = 1;
 	if (w)
 		tcw->w = 1;
 }
 EXPORT_SYMBOL(tcw_init);

 static inline size_t tca_size(struct tccb *tccb)
 {
 	return tccb->tcah.tcal - 12;
 }

 static u32 calc_dcw_count(struct tccb *tccb)
 {
 	int offset;
 	struct dcw *dcw;
 	u32 count = 0;
 	size_t size;

 	size = tca_size(tccb);
 	for (offset = 0; offset < size;) {
 		dcw = (struct dcw *) &tccb->tca[offset];
 		count += dcw->count;
 		if (!(dcw->flags & DCW_FLAGS_CC))
 			break;
 		offset += sizeof(struct dcw) + ALIGN((int) dcw->cd_count, 4);
 	}
 	return count;
 }

 static u32 calc_cbc_size(struct tidaw *tidaw, int num)
 {
 	int i;
 	u32 cbc_data;
 	u32 cbc_count = 0;
 	u64 data_count = 0;

 	for (i = 0; i < num; i++) {
 		if (tidaw[i].flags & TIDAW_FLAGS_LAST)
 			break;
 		/* TODO: find out if padding applies to total of data
 		 * transferred or data transferred by this tidaw. Assumption:
 		 * applies to total. */
 		data_count += tidaw[i].count;
 		if (tidaw[i].flags & TIDAW_FLAGS_INSERT_CBC) {
 			cbc_data = 4 + ALIGN(data_count, 4) - data_count;
 			cbc_count += cbc_data;
 			data_count += cbc_data;
 		}
 	}
 	return cbc_count;
 }

 /**
  * tcw_finalize - finalize tcw length fields and tidaw list
  * @tcw: pointer to the tcw
  * @num_tidaws: the number of tidaws used to address input/output data or zero
  * if no tida is used
  *
  * Calculate the input-/output-count and tccbl field in the tcw, add a
  * tcat the tccb and terminate the data tidaw list if used.
  *
  * Note: in case input- or output-tida is used, the tidaw-list must be stored
  * in contiguous storage (no ttic). The tcal field in the tccb must be
  * up-to-date.
  */
 void tcw_finalize(struct tcw *tcw, int num_tidaws)
 {
 	struct tidaw *tidaw;
 	struct tccb *tccb;
 	struct tccb_tcat *tcat;
 	u32 count;

 	/* Terminate tidaw list. */
 	tidaw = tcw_get_data(tcw);
 	if (num_tidaws > 0)
 		tidaw[num_tidaws - 1].flags |= TIDAW_FLAGS_LAST;
 	/* Add tcat to tccb. */
 	tccb = tcw_get_tccb(tcw);
 	tcat = (struct tccb_tcat *) &tccb->tca[tca_size(tccb)];
 	memset(tcat, 0, sizeof(*tcat));
 	/* Calculate tcw input/output count and tcat transport count. */
 	count = calc_dcw_count(tccb);
 	if (tcw->w && (tcw->flags & TCW_FLAGS_OUTPUT_TIDA))
 		count += calc_cbc_size(tidaw, num_tidaws);
 	if (tcw->r)
 		tcw->input_count = count;
 	else if (tcw->w)
 		tcw->output_count = count;
 	tcat->count = ALIGN(count, 4) + 4;
 	/* Calculate tccbl. */
 	tcw->tccbl = (sizeof(struct tccb) + tca_size(tccb) +
 		      sizeof(struct tccb_tcat) - 20) >> 2;
 }
 EXPORT_SYMBOL(tcw_finalize);

 /**
  * tcw_set_intrg - set the interrogate tcw address of a tcw
  * @tcw: the tcw address
  * @intrg_tcw: the address of the interrogate tcw
  *
  * Set the address of the interrogate tcw in the specified tcw.
  */
 void tcw_set_intrg(struct tcw *tcw, struct tcw *intrg_tcw)
 {
 	tcw->intrg = (u32) ((addr_t) intrg_tcw);
 }
 EXPORT_SYMBOL(tcw_set_intrg);

 /**
  * tcw_set_data - set data address and tida flag of a tcw
  * @tcw: the tcw address
  * @data: the data address
  * @use_tidal: zero of the data address specifies a contiguous block of data,
  * non-zero if it specifies a list if tidaws.
  *
  * Set the input/output data address of a tcw (depending on the value of the
  * r-flag and w-flag). If @use_tidal is non-zero, the corresponding tida flag
  * is set as well.
  */
 void tcw_set_data(struct tcw *tcw, void *data, int use_tidal)
 {
 	if (tcw->r) {
 		tcw->input = (u64) ((addr_t) data);
 		if (use_tidal)
 			tcw->flags |= TCW_FLAGS_INPUT_TIDA;
 	} else if (tcw->w) {
 		tcw->output = (u64) ((addr_t) data);
 		if (use_tidal)
 			tcw->flags |= TCW_FLAGS_OUTPUT_TIDA;
 	}
 }
 EXPORT_SYMBOL(tcw_set_data);

 /**
  * tcw_set_tccb - set tccb address of a tcw
  * @tcw: the tcw address
  * @tccb: the tccb address
  *
  * Set the address of the tccb in the specified tcw.
  */
 void tcw_set_tccb(struct tcw *tcw, struct tccb *tccb)
 {
 	tcw->tccb = (u64) ((addr_t) tccb);
 }
 EXPORT_SYMBOL(tcw_set_tccb);

 /**
  * tcw_set_tsb - set tsb address of a tcw
  * @tcw: the tcw address
  * @tsb: the tsb address
  *
  * Set the address of the tsb in the specified tcw.
  */
 void tcw_set_tsb(struct tcw *tcw, struct tsb *tsb)
 {
 	tcw->tsb = (u64) ((addr_t) tsb);
 }
 EXPORT_SYMBOL(tcw_set_tsb);

 /**
  * tccb_init - initialize tccb
  * @tccb: the tccb address
  * @size: the maximum size of the tccb
  * @sac: the service-action-code to be user
  *
  * Initialize the header of the specified tccb by resetting all values to zero
  * and filling in defaults for format, sac and initial tcal fields.
  */
 void tccb_init(struct tccb *tccb, size_t size, u32 sac)
 {
 	memset(tccb, 0, size);
 	tccb->tcah.format = TCCB_FORMAT_DEFAULT;
 	tccb->tcah.sac = sac;
 	tccb->tcah.tcal = 12;
 }
 EXPORT_SYMBOL(tccb_init);

 /**
  * tsb_init - initialize tsb
  * @tsb: the tsb address
  *
  * Initialize the specified tsb by resetting all values to zero.
  */
 void tsb_init(struct tsb *tsb)
 {
 	memset(tsb, 0, sizeof(*tsb));
 }
 EXPORT_SYMBOL(tsb_init);

 /**
  * tccb_add_dcw - add a dcw to the tccb
  * @tccb: the tccb address
  * @tccb_size: the maximum tccb size
  * @cmd: the dcw command
  * @flags: flags for the dcw
  * @cd: pointer to control data for this dcw or NULL if none is required
  * @cd_count: number of control data bytes for this dcw
  * @count: number of data bytes for this dcw
  *
  * Add a new dcw to the specified tccb by writing the dcw information specified
  * by @cmd, @flags, @cd, @cd_count and @count to the tca of the tccb. Return
  * a pointer to the newly added dcw on success or -%ENOSPC if the new dcw
  * would exceed the available space as defined by @tccb_size.
  *
  * Note: the tcal field of the tccb header will be updates to reflect added
  * content.
  */
 struct dcw *tccb_add_dcw(struct tccb *tccb, size_t tccb_size, u8 cmd, u8 flags,
 			 void *cd, u8 cd_count, u32 count)
 {
 	struct dcw *dcw;
 	int size;
 	int tca_offset;

 	/* Check for space. */
 	tca_offset = tca_size(tccb);
 	size = ALIGN(sizeof(struct dcw) + cd_count, 4);
 	if (sizeof(struct tccb_tcah) + tca_offset + size +
 	    sizeof(struct tccb_tcat) > tccb_size)
 		return ERR_PTR(-ENOSPC);
 	/* Add dcw to tca. */
 	dcw = (struct dcw *) &tccb->tca[tca_offset];
 	memset(dcw, 0, size);
 	dcw->cmd = cmd;
 	dcw->flags = flags;
 	dcw->count = count;
 	dcw->cd_count = cd_count;
 	if (cd)
 		memcpy(&dcw->cd[0], cd, cd_count);
 	tccb->tcah.tcal += size;
 	return dcw;
 }
 EXPORT_SYMBOL(tccb_add_dcw);

 /**
  * tcw_add_tidaw - add a tidaw to a tcw
  * @tcw: the tcw address
  * @num_tidaws: the current number of tidaws
  * @flags: flags for the new tidaw
  * @addr: address value for the new tidaw
  * @count: count value for the new tidaw
  *
  * Add a new tidaw to the input/output data tidaw-list of the specified tcw
  * (depending on the value of the r-flag and w-flag) and return a pointer to
  * the new tidaw.
  *
  * Note: the tidaw-list is assumed to be contiguous with no ttics. The caller
  * must ensure that there is enough space for the new tidaw. The last-tidaw
  * flag for the last tidaw in the list will be set by tcw_finalize.
  */
 struct tidaw *tcw_add_tidaw(struct tcw *tcw, int num_tidaws, u8 flags,
 			    void *addr, u32 count)
 {
 	struct tidaw *tidaw;

 	/* Add tidaw to tidaw-list. */
 	tidaw = ((struct tidaw *) tcw_get_data(tcw)) + num_tidaws;
 	memset(tidaw, 0, sizeof(struct tidaw));
 	tidaw->flags = flags;
 	tidaw->count = count;
 	tidaw->addr = (u64) ((addr_t) addr);
 	return tidaw;
 }
 EXPORT_SYMBOL(tcw_add_tidaw);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Functions for assembling fcx enabled I/O control blocks.
	*
	* Copyright IBM Corp. 2008
	* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
	*/

	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/string.h>
	#include <linux/errno.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include <asm/fcx.h>
	#include "cio.h"

	/**
	* tcw_get_intrg - return pointer to associated interrogate tcw
	* @tcw: pointer to the original tcw
	*
	* Return a pointer to the interrogate tcw associated with the specified tcw
	* or %NULL if there is no associated interrogate tcw.
	*/
	struct tcw tcw_get_intrg(struct tcw tcw)
	{
	return (struct tcw *) ((addr_t) tcw->intrg);
	}
	EXPORT_SYMBOL(tcw_get_intrg);

	/**
	* tcw_get_data - return pointer to input/output data associated with tcw
	* @tcw: pointer to the tcw
	*
	* Return the input or output data address specified in the tcw depending
	* on whether the r-bit or the w-bit is set. If neither bit is set, return
	* %NULL.
	*/
	void tcw_get_data(struct tcw tcw)
	{
	if (tcw->r)
	return (void *) ((addr_t) tcw->input);
	if (tcw->w)
	return (void *) ((addr_t) tcw->output);
	return NULL;
	}
	EXPORT_SYMBOL(tcw_get_data);

	/**
	* tcw_get_tccb - return pointer to tccb associated with tcw
	* @tcw: pointer to the tcw
	*
	* Return pointer to the tccb associated with this tcw.
	*/
	struct tccb tcw_get_tccb(struct tcw tcw)
	{
	return (struct tccb *) ((addr_t) tcw->tccb);
	}
	EXPORT_SYMBOL(tcw_get_tccb);

	/**
	* tcw_get_tsb - return pointer to tsb associated with tcw
	* @tcw: pointer to the tcw
	*
	* Return pointer to the tsb associated with this tcw.
	*/
	struct tsb tcw_get_tsb(struct tcw tcw)
	{
	return (struct tsb *) ((addr_t) tcw->tsb);
	}
	EXPORT_SYMBOL(tcw_get_tsb);

	/**
	* tcw_init - initialize tcw data structure
	* @tcw: pointer to the tcw to be initialized
	* @r: initial value of the r-bit
	* @w: initial value of the w-bit
	*
	* Initialize all fields of the specified tcw data structure with zero and
	* fill in the format, flags, r and w fields.
	*/
	void tcw_init(struct tcw *tcw, int r, int w)
	{
	memset(tcw, 0, sizeof(struct tcw));
	tcw->format = TCW_FORMAT_DEFAULT;
	tcw->flags = TCW_FLAGS_TIDAW_FORMAT(TCW_TIDAW_FORMAT_DEFAULT);
	if (r)
	tcw->r = 1;
	if (w)
	tcw->w = 1;
	}
	EXPORT_SYMBOL(tcw_init);

	static inline size_t tca_size(struct tccb *tccb)
	{
	return tccb->tcah.tcal - 12;
	}

	static u32 calc_dcw_count(struct tccb *tccb)
	{
	int offset;
	struct dcw *dcw;
	u32 count = 0;
	size_t size;

	size = tca_size(tccb);
	for (offset = 0; offset < size;) {
	dcw = (struct dcw *) &tccb->tca[offset];
	count += dcw->count;
	if (!(dcw->flags & DCW_FLAGS_CC))
	break;
	offset += sizeof(struct dcw) + ALIGN((int) dcw->cd_count, 4);
	}
	return count;
	}

	static u32 calc_cbc_size(struct tidaw *tidaw, int num)
	{
	int i;
	u32 cbc_data;
	u32 cbc_count = 0;
	u64 data_count = 0;

	for (i = 0; i < num; i++) {
	if (tidaw[i].flags & TIDAW_FLAGS_LAST)
	break;
	/* TODO: find out if padding applies to total of data
	* transferred or data transferred by this tidaw. Assumption:
	* applies to total. */
	data_count += tidaw[i].count;
	if (tidaw[i].flags & TIDAW_FLAGS_INSERT_CBC) {
	cbc_data = 4 + ALIGN(data_count, 4) - data_count;
	cbc_count += cbc_data;
	data_count += cbc_data;
	}
	}
	return cbc_count;
	}

	/**
	* tcw_finalize - finalize tcw length fields and tidaw list
	* @tcw: pointer to the tcw
	* @num_tidaws: the number of tidaws used to address input/output data or zero
	* if no tida is used
	*
	* Calculate the input-/output-count and tccbl field in the tcw, add a
	* tcat the tccb and terminate the data tidaw list if used.
	*
	* Note: in case input- or output-tida is used, the tidaw-list must be stored
	* in contiguous storage (no ttic). The tcal field in the tccb must be
	* up-to-date.
	*/
	void tcw_finalize(struct tcw *tcw, int num_tidaws)
	{
	struct tidaw *tidaw;
	struct tccb *tccb;
	struct tccb_tcat *tcat;
	u32 count;

	/* Terminate tidaw list. */
	tidaw = tcw_get_data(tcw);
	if (num_tidaws > 0)
	tidaw[num_tidaws - 1].flags \|= TIDAW_FLAGS_LAST;
	/* Add tcat to tccb. */
	tccb = tcw_get_tccb(tcw);
	tcat = (struct tccb_tcat *) &tccb->tca[tca_size(tccb)];
	memset(tcat, 0, sizeof(*tcat));
	/* Calculate tcw input/output count and tcat transport count. */
	count = calc_dcw_count(tccb);
	if (tcw->w && (tcw->flags & TCW_FLAGS_OUTPUT_TIDA))
	count += calc_cbc_size(tidaw, num_tidaws);
	if (tcw->r)
	tcw->input_count = count;
	else if (tcw->w)
	tcw->output_count = count;
	tcat->count = ALIGN(count, 4) + 4;
	/* Calculate tccbl. */
	tcw->tccbl = (sizeof(struct tccb) + tca_size(tccb) +
	sizeof(struct tccb_tcat) - 20) >> 2;
	}
	EXPORT_SYMBOL(tcw_finalize);

	/**
	* tcw_set_intrg - set the interrogate tcw address of a tcw
	* @tcw: the tcw address
	* @intrg_tcw: the address of the interrogate tcw
	*
	* Set the address of the interrogate tcw in the specified tcw.
	*/
	void tcw_set_intrg(struct tcw tcw, struct tcw intrg_tcw)
	{
	tcw->intrg = (u32) ((addr_t) intrg_tcw);
	}
	EXPORT_SYMBOL(tcw_set_intrg);

	/**
	* tcw_set_data - set data address and tida flag of a tcw
	* @tcw: the tcw address
	* @data: the data address
	* @use_tidal: zero of the data address specifies a contiguous block of data,
	* non-zero if it specifies a list if tidaws.
	*
	* Set the input/output data address of a tcw (depending on the value of the
	* r-flag and w-flag). If @use_tidal is non-zero, the corresponding tida flag
	* is set as well.
	*/
	void tcw_set_data(struct tcw tcw, void data, int use_tidal)
	{
	if (tcw->r) {
	tcw->input = (u64) ((addr_t) data);
	if (use_tidal)
	tcw->flags \|= TCW_FLAGS_INPUT_TIDA;
	} else if (tcw->w) {
	tcw->output = (u64) ((addr_t) data);
	if (use_tidal)
	tcw->flags \|= TCW_FLAGS_OUTPUT_TIDA;
	}
	}
	EXPORT_SYMBOL(tcw_set_data);

	/**
	* tcw_set_tccb - set tccb address of a tcw
	* @tcw: the tcw address
	* @tccb: the tccb address
	*
	* Set the address of the tccb in the specified tcw.
	*/
	void tcw_set_tccb(struct tcw tcw, struct tccb tccb)
	{
	tcw->tccb = (u64) ((addr_t) tccb);
	}
	EXPORT_SYMBOL(tcw_set_tccb);

	/**
	* tcw_set_tsb - set tsb address of a tcw
	* @tcw: the tcw address
	* @tsb: the tsb address
	*
	* Set the address of the tsb in the specified tcw.
	*/
	void tcw_set_tsb(struct tcw tcw, struct tsb tsb)
	{
	tcw->tsb = (u64) ((addr_t) tsb);
	}
	EXPORT_SYMBOL(tcw_set_tsb);

	/**
	* tccb_init - initialize tccb
	* @tccb: the tccb address
	* @size: the maximum size of the tccb
	* @sac: the service-action-code to be user
	*
	* Initialize the header of the specified tccb by resetting all values to zero
	* and filling in defaults for format, sac and initial tcal fields.
	*/
	void tccb_init(struct tccb *tccb, size_t size, u32 sac)
	{
	memset(tccb, 0, size);
	tccb->tcah.format = TCCB_FORMAT_DEFAULT;
	tccb->tcah.sac = sac;
	tccb->tcah.tcal = 12;
	}
	EXPORT_SYMBOL(tccb_init);

	/**
	* tsb_init - initialize tsb
	* @tsb: the tsb address
	*
	* Initialize the specified tsb by resetting all values to zero.
	*/
	void tsb_init(struct tsb *tsb)
	{
	memset(tsb, 0, sizeof(*tsb));
	}
	EXPORT_SYMBOL(tsb_init);

	/**
	* tccb_add_dcw - add a dcw to the tccb
	* @tccb: the tccb address
	* @tccb_size: the maximum tccb size
	* @cmd: the dcw command
	* @flags: flags for the dcw
	* @cd: pointer to control data for this dcw or NULL if none is required
	* @cd_count: number of control data bytes for this dcw
	* @count: number of data bytes for this dcw
	*
	* Add a new dcw to the specified tccb by writing the dcw information specified
	* by @cmd, @flags, @cd, @cd_count and @count to the tca of the tccb. Return
	* a pointer to the newly added dcw on success or -%ENOSPC if the new dcw
	* would exceed the available space as defined by @tccb_size.
	*
	* Note: the tcal field of the tccb header will be updates to reflect added
	* content.
	*/
	struct dcw tccb_add_dcw(struct tccb tccb, size_t tccb_size, u8 cmd, u8 flags,
	void *cd, u8 cd_count, u32 count)
	{
	struct dcw *dcw;
	int size;
	int tca_offset;

	/* Check for space. */
	tca_offset = tca_size(tccb);
	size = ALIGN(sizeof(struct dcw) + cd_count, 4);
	if (sizeof(struct tccb_tcah) + tca_offset + size +
	sizeof(struct tccb_tcat) > tccb_size)
	return ERR_PTR(-ENOSPC);
	/* Add dcw to tca. */
	dcw = (struct dcw *) &tccb->tca[tca_offset];
	memset(dcw, 0, size);
	dcw->cmd = cmd;
	dcw->flags = flags;
	dcw->count = count;
	dcw->cd_count = cd_count;
	if (cd)
	memcpy(&dcw->cd[0], cd, cd_count);
	tccb->tcah.tcal += size;
	return dcw;
	}
	EXPORT_SYMBOL(tccb_add_dcw);

	/**
	* tcw_add_tidaw - add a tidaw to a tcw
	* @tcw: the tcw address
	* @num_tidaws: the current number of tidaws
	* @flags: flags for the new tidaw
	* @addr: address value for the new tidaw
	* @count: count value for the new tidaw
	*
	* Add a new tidaw to the input/output data tidaw-list of the specified tcw
	* (depending on the value of the r-flag and w-flag) and return a pointer to
	* the new tidaw.
	*
	* Note: the tidaw-list is assumed to be contiguous with no ttics. The caller
	* must ensure that there is enough space for the new tidaw. The last-tidaw
	* flag for the last tidaw in the list will be set by tcw_finalize.
	*/
	struct tidaw tcw_add_tidaw(struct tcw tcw, int num_tidaws, u8 flags,
	void *addr, u32 count)
	{
	struct tidaw *tidaw;

	/* Add tidaw to tidaw-list. */
	tidaw = ((struct tidaw *) tcw_get_data(tcw)) + num_tidaws;
	memset(tidaw, 0, sizeof(struct tidaw));
	tidaw->flags = flags;
	tidaw->count = count;
	tidaw->addr = (u64) ((addr_t) addr);
	return tidaw;
	}
	EXPORT_SYMBOL(tcw_add_tidaw);