352 lines
9.3 KiB
C
352 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Functions for assembling fcx enabled I/O control blocks.
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*
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* Copyright IBM Corp. 2008
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* Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <asm/fcx.h>
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#include "cio.h"
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/**
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* tcw_get_intrg - return pointer to associated interrogate tcw
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* @tcw: pointer to the original tcw
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*
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* Return a pointer to the interrogate tcw associated with the specified tcw
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* or %NULL if there is no associated interrogate tcw.
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*/
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struct tcw *tcw_get_intrg(struct tcw *tcw)
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{
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return (struct tcw *) ((addr_t) tcw->intrg);
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}
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EXPORT_SYMBOL(tcw_get_intrg);
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/**
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* tcw_get_data - return pointer to input/output data associated with tcw
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* @tcw: pointer to the tcw
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*
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* Return the input or output data address specified in the tcw depending
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* on whether the r-bit or the w-bit is set. If neither bit is set, return
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* %NULL.
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*/
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void *tcw_get_data(struct tcw *tcw)
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{
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if (tcw->r)
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return (void *) ((addr_t) tcw->input);
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if (tcw->w)
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return (void *) ((addr_t) tcw->output);
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return NULL;
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}
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EXPORT_SYMBOL(tcw_get_data);
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/**
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* tcw_get_tccb - return pointer to tccb associated with tcw
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* @tcw: pointer to the tcw
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*
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* Return pointer to the tccb associated with this tcw.
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*/
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struct tccb *tcw_get_tccb(struct tcw *tcw)
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{
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return (struct tccb *) ((addr_t) tcw->tccb);
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}
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EXPORT_SYMBOL(tcw_get_tccb);
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/**
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* tcw_get_tsb - return pointer to tsb associated with tcw
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* @tcw: pointer to the tcw
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*
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* Return pointer to the tsb associated with this tcw.
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*/
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struct tsb *tcw_get_tsb(struct tcw *tcw)
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{
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return (struct tsb *) ((addr_t) tcw->tsb);
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}
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EXPORT_SYMBOL(tcw_get_tsb);
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/**
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* tcw_init - initialize tcw data structure
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* @tcw: pointer to the tcw to be initialized
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* @r: initial value of the r-bit
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* @w: initial value of the w-bit
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*
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* Initialize all fields of the specified tcw data structure with zero and
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* fill in the format, flags, r and w fields.
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*/
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void tcw_init(struct tcw *tcw, int r, int w)
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{
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memset(tcw, 0, sizeof(struct tcw));
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tcw->format = TCW_FORMAT_DEFAULT;
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tcw->flags = TCW_FLAGS_TIDAW_FORMAT(TCW_TIDAW_FORMAT_DEFAULT);
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if (r)
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tcw->r = 1;
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if (w)
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tcw->w = 1;
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}
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EXPORT_SYMBOL(tcw_init);
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static inline size_t tca_size(struct tccb *tccb)
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{
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return tccb->tcah.tcal - 12;
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}
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static u32 calc_dcw_count(struct tccb *tccb)
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{
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int offset;
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struct dcw *dcw;
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u32 count = 0;
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size_t size;
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size = tca_size(tccb);
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for (offset = 0; offset < size;) {
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dcw = (struct dcw *) &tccb->tca[offset];
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count += dcw->count;
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if (!(dcw->flags & DCW_FLAGS_CC))
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break;
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offset += sizeof(struct dcw) + ALIGN((int) dcw->cd_count, 4);
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}
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return count;
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}
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static u32 calc_cbc_size(struct tidaw *tidaw, int num)
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{
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int i;
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u32 cbc_data;
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u32 cbc_count = 0;
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u64 data_count = 0;
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for (i = 0; i < num; i++) {
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if (tidaw[i].flags & TIDAW_FLAGS_LAST)
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break;
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/* TODO: find out if padding applies to total of data
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* transferred or data transferred by this tidaw. Assumption:
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* applies to total. */
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data_count += tidaw[i].count;
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if (tidaw[i].flags & TIDAW_FLAGS_INSERT_CBC) {
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cbc_data = 4 + ALIGN(data_count, 4) - data_count;
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cbc_count += cbc_data;
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data_count += cbc_data;
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}
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}
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return cbc_count;
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}
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/**
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* tcw_finalize - finalize tcw length fields and tidaw list
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* @tcw: pointer to the tcw
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* @num_tidaws: the number of tidaws used to address input/output data or zero
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* if no tida is used
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*
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* Calculate the input-/output-count and tccbl field in the tcw, add a
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* tcat the tccb and terminate the data tidaw list if used.
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*
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* Note: in case input- or output-tida is used, the tidaw-list must be stored
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* in contiguous storage (no ttic). The tcal field in the tccb must be
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* up-to-date.
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*/
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void tcw_finalize(struct tcw *tcw, int num_tidaws)
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{
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struct tidaw *tidaw;
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struct tccb *tccb;
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struct tccb_tcat *tcat;
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u32 count;
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/* Terminate tidaw list. */
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tidaw = tcw_get_data(tcw);
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if (num_tidaws > 0)
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tidaw[num_tidaws - 1].flags |= TIDAW_FLAGS_LAST;
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/* Add tcat to tccb. */
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tccb = tcw_get_tccb(tcw);
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tcat = (struct tccb_tcat *) &tccb->tca[tca_size(tccb)];
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memset(tcat, 0, sizeof(*tcat));
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/* Calculate tcw input/output count and tcat transport count. */
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count = calc_dcw_count(tccb);
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if (tcw->w && (tcw->flags & TCW_FLAGS_OUTPUT_TIDA))
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count += calc_cbc_size(tidaw, num_tidaws);
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if (tcw->r)
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tcw->input_count = count;
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else if (tcw->w)
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tcw->output_count = count;
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tcat->count = ALIGN(count, 4) + 4;
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/* Calculate tccbl. */
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tcw->tccbl = (sizeof(struct tccb) + tca_size(tccb) +
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sizeof(struct tccb_tcat) - 20) >> 2;
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}
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EXPORT_SYMBOL(tcw_finalize);
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/**
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* tcw_set_intrg - set the interrogate tcw address of a tcw
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* @tcw: the tcw address
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* @intrg_tcw: the address of the interrogate tcw
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*
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* Set the address of the interrogate tcw in the specified tcw.
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*/
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void tcw_set_intrg(struct tcw *tcw, struct tcw *intrg_tcw)
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{
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tcw->intrg = (u32) ((addr_t) intrg_tcw);
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}
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EXPORT_SYMBOL(tcw_set_intrg);
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/**
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* tcw_set_data - set data address and tida flag of a tcw
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* @tcw: the tcw address
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* @data: the data address
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* @use_tidal: zero of the data address specifies a contiguous block of data,
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* non-zero if it specifies a list if tidaws.
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*
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* Set the input/output data address of a tcw (depending on the value of the
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* r-flag and w-flag). If @use_tidal is non-zero, the corresponding tida flag
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* is set as well.
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*/
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void tcw_set_data(struct tcw *tcw, void *data, int use_tidal)
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{
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if (tcw->r) {
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tcw->input = (u64) ((addr_t) data);
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if (use_tidal)
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tcw->flags |= TCW_FLAGS_INPUT_TIDA;
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} else if (tcw->w) {
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tcw->output = (u64) ((addr_t) data);
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if (use_tidal)
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tcw->flags |= TCW_FLAGS_OUTPUT_TIDA;
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}
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}
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EXPORT_SYMBOL(tcw_set_data);
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/**
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* tcw_set_tccb - set tccb address of a tcw
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* @tcw: the tcw address
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* @tccb: the tccb address
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*
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* Set the address of the tccb in the specified tcw.
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*/
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void tcw_set_tccb(struct tcw *tcw, struct tccb *tccb)
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{
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tcw->tccb = (u64) ((addr_t) tccb);
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}
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EXPORT_SYMBOL(tcw_set_tccb);
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/**
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* tcw_set_tsb - set tsb address of a tcw
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* @tcw: the tcw address
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* @tsb: the tsb address
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*
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* Set the address of the tsb in the specified tcw.
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*/
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void tcw_set_tsb(struct tcw *tcw, struct tsb *tsb)
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{
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tcw->tsb = (u64) ((addr_t) tsb);
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}
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EXPORT_SYMBOL(tcw_set_tsb);
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/**
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* tccb_init - initialize tccb
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* @tccb: the tccb address
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* @size: the maximum size of the tccb
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* @sac: the service-action-code to be user
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*
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* Initialize the header of the specified tccb by resetting all values to zero
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* and filling in defaults for format, sac and initial tcal fields.
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*/
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void tccb_init(struct tccb *tccb, size_t size, u32 sac)
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{
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memset(tccb, 0, size);
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tccb->tcah.format = TCCB_FORMAT_DEFAULT;
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tccb->tcah.sac = sac;
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tccb->tcah.tcal = 12;
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}
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EXPORT_SYMBOL(tccb_init);
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/**
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* tsb_init - initialize tsb
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* @tsb: the tsb address
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*
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* Initialize the specified tsb by resetting all values to zero.
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*/
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void tsb_init(struct tsb *tsb)
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{
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memset(tsb, 0, sizeof(*tsb));
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}
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EXPORT_SYMBOL(tsb_init);
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/**
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* tccb_add_dcw - add a dcw to the tccb
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* @tccb: the tccb address
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* @tccb_size: the maximum tccb size
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* @cmd: the dcw command
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* @flags: flags for the dcw
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* @cd: pointer to control data for this dcw or NULL if none is required
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* @cd_count: number of control data bytes for this dcw
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* @count: number of data bytes for this dcw
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*
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* Add a new dcw to the specified tccb by writing the dcw information specified
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* by @cmd, @flags, @cd, @cd_count and @count to the tca of the tccb. Return
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* a pointer to the newly added dcw on success or -%ENOSPC if the new dcw
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* would exceed the available space as defined by @tccb_size.
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*
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* Note: the tcal field of the tccb header will be updates to reflect added
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* content.
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*/
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struct dcw *tccb_add_dcw(struct tccb *tccb, size_t tccb_size, u8 cmd, u8 flags,
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void *cd, u8 cd_count, u32 count)
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{
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struct dcw *dcw;
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int size;
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int tca_offset;
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/* Check for space. */
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tca_offset = tca_size(tccb);
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size = ALIGN(sizeof(struct dcw) + cd_count, 4);
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if (sizeof(struct tccb_tcah) + tca_offset + size +
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sizeof(struct tccb_tcat) > tccb_size)
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return ERR_PTR(-ENOSPC);
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/* Add dcw to tca. */
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dcw = (struct dcw *) &tccb->tca[tca_offset];
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memset(dcw, 0, size);
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dcw->cmd = cmd;
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dcw->flags = flags;
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dcw->count = count;
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dcw->cd_count = cd_count;
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if (cd)
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memcpy(&dcw->cd[0], cd, cd_count);
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tccb->tcah.tcal += size;
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return dcw;
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}
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EXPORT_SYMBOL(tccb_add_dcw);
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/**
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* tcw_add_tidaw - add a tidaw to a tcw
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* @tcw: the tcw address
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* @num_tidaws: the current number of tidaws
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* @flags: flags for the new tidaw
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* @addr: address value for the new tidaw
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* @count: count value for the new tidaw
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*
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* Add a new tidaw to the input/output data tidaw-list of the specified tcw
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* (depending on the value of the r-flag and w-flag) and return a pointer to
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* the new tidaw.
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*
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* Note: the tidaw-list is assumed to be contiguous with no ttics. The caller
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* must ensure that there is enough space for the new tidaw. The last-tidaw
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* flag for the last tidaw in the list will be set by tcw_finalize.
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*/
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struct tidaw *tcw_add_tidaw(struct tcw *tcw, int num_tidaws, u8 flags,
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void *addr, u32 count)
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{
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struct tidaw *tidaw;
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/* Add tidaw to tidaw-list. */
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tidaw = ((struct tidaw *) tcw_get_data(tcw)) + num_tidaws;
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memset(tidaw, 0, sizeof(struct tidaw));
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tidaw->flags = flags;
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tidaw->count = count;
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tidaw->addr = (u64) ((addr_t) addr);
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return tidaw;
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}
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EXPORT_SYMBOL(tcw_add_tidaw);
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