forked from luck/tmp_suning_uos_patched
7936a892e7
- remove the unnecessary map_single path. - convert to use the new accessors for the sg lists and the parameters. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
701 lines
20 KiB
C
701 lines
20 KiB
C
/*
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* This file is part of the zfcp device driver for
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* FCP adapters for IBM System z9 and zSeries.
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*
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* (C) Copyright IBM Corp. 2002, 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "zfcp_ext.h"
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static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *, int);
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static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_get
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(struct zfcp_qdio_queue *, int, int);
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static inline volatile struct qdio_buffer_element *zfcp_qdio_sbale_resp
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(struct zfcp_fsf_req *, int, int);
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static volatile struct qdio_buffer_element *zfcp_qdio_sbal_chain
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(struct zfcp_fsf_req *, unsigned long);
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static volatile struct qdio_buffer_element *zfcp_qdio_sbale_next
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(struct zfcp_fsf_req *, unsigned long);
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static int zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *, int, int);
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static inline int zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *);
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static void zfcp_qdio_sbale_fill
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(struct zfcp_fsf_req *, unsigned long, void *, int);
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static int zfcp_qdio_sbals_from_segment
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(struct zfcp_fsf_req *, unsigned long, void *, unsigned long);
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static qdio_handler_t zfcp_qdio_request_handler;
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static qdio_handler_t zfcp_qdio_response_handler;
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static int zfcp_qdio_handler_error_check(struct zfcp_adapter *,
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unsigned int, unsigned int, unsigned int, int, int);
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#define ZFCP_LOG_AREA ZFCP_LOG_AREA_QDIO
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/*
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* Frees BUFFER memory for each of the pointers of the struct qdio_buffer array
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* in the adapter struct sbuf is the pointer array.
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*
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* locks: must only be called with zfcp_data.config_sema taken
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*/
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static void
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zfcp_qdio_buffers_dequeue(struct qdio_buffer **sbuf)
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{
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int pos;
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for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE)
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free_page((unsigned long) sbuf[pos]);
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}
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/*
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* Allocates BUFFER memory to each of the pointers of the qdio_buffer_t
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* array in the adapter struct.
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* Cur_buf is the pointer array
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*
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* returns: zero on success else -ENOMEM
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* locks: must only be called with zfcp_data.config_sema taken
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*/
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static int
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zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbuf)
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{
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int pos;
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for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos += QBUFF_PER_PAGE) {
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sbuf[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
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if (!sbuf[pos]) {
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zfcp_qdio_buffers_dequeue(sbuf);
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return -ENOMEM;
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}
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}
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for (pos = 0; pos < QDIO_MAX_BUFFERS_PER_Q; pos++)
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if (pos % QBUFF_PER_PAGE)
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sbuf[pos] = sbuf[pos - 1] + 1;
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return 0;
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}
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/* locks: must only be called with zfcp_data.config_sema taken */
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int
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zfcp_qdio_allocate_queues(struct zfcp_adapter *adapter)
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{
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int ret;
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ret = zfcp_qdio_buffers_enqueue(adapter->request_queue.buffer);
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if (ret)
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return ret;
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return zfcp_qdio_buffers_enqueue(adapter->response_queue.buffer);
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}
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/* locks: must only be called with zfcp_data.config_sema taken */
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void
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zfcp_qdio_free_queues(struct zfcp_adapter *adapter)
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{
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ZFCP_LOG_TRACE("freeing request_queue buffers\n");
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zfcp_qdio_buffers_dequeue(adapter->request_queue.buffer);
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ZFCP_LOG_TRACE("freeing response_queue buffers\n");
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zfcp_qdio_buffers_dequeue(adapter->response_queue.buffer);
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}
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int
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zfcp_qdio_allocate(struct zfcp_adapter *adapter)
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{
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struct qdio_initialize *init_data;
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init_data = &adapter->qdio_init_data;
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init_data->cdev = adapter->ccw_device;
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init_data->q_format = QDIO_SCSI_QFMT;
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memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8);
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ASCEBC(init_data->adapter_name, 8);
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init_data->qib_param_field_format = 0;
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init_data->qib_param_field = NULL;
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init_data->input_slib_elements = NULL;
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init_data->output_slib_elements = NULL;
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init_data->min_input_threshold = ZFCP_MIN_INPUT_THRESHOLD;
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init_data->max_input_threshold = ZFCP_MAX_INPUT_THRESHOLD;
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init_data->min_output_threshold = ZFCP_MIN_OUTPUT_THRESHOLD;
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init_data->max_output_threshold = ZFCP_MAX_OUTPUT_THRESHOLD;
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init_data->no_input_qs = 1;
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init_data->no_output_qs = 1;
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init_data->input_handler = zfcp_qdio_response_handler;
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init_data->output_handler = zfcp_qdio_request_handler;
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init_data->int_parm = (unsigned long) adapter;
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init_data->flags = QDIO_INBOUND_0COPY_SBALS |
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QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS;
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init_data->input_sbal_addr_array =
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(void **) (adapter->response_queue.buffer);
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init_data->output_sbal_addr_array =
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(void **) (adapter->request_queue.buffer);
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return qdio_allocate(init_data);
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}
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/*
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* function: zfcp_qdio_handler_error_check
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*
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* purpose: called by the response handler to determine error condition
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*
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* returns: error flag
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*
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*/
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static int
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zfcp_qdio_handler_error_check(struct zfcp_adapter *adapter, unsigned int status,
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unsigned int qdio_error, unsigned int siga_error,
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int first_element, int elements_processed)
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{
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int retval = 0;
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if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
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retval = -EIO;
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ZFCP_LOG_INFO("QDIO problem occurred (status=0x%x, "
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"qdio_error=0x%x, siga_error=0x%x)\n",
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status, qdio_error, siga_error);
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zfcp_hba_dbf_event_qdio(adapter, status, qdio_error, siga_error,
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first_element, elements_processed);
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/*
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* Restarting IO on the failed adapter from scratch.
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* Since we have been using this adapter, it is save to assume
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* that it is not failed but recoverable. The card seems to
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* report link-up events by self-initiated queue shutdown.
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* That is why we need to clear the link-down flag
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* which is set again in case we have missed by a mile.
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*/
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zfcp_erp_adapter_reopen(
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adapter,
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ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
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ZFCP_STATUS_COMMON_ERP_FAILED);
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}
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return retval;
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}
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/*
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* function: zfcp_qdio_request_handler
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*
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* purpose: is called by QDIO layer for completed SBALs in request queue
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*
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* returns: (void)
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*/
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static void
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zfcp_qdio_request_handler(struct ccw_device *ccw_device,
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unsigned int status,
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unsigned int qdio_error,
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unsigned int siga_error,
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unsigned int queue_number,
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int first_element,
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int elements_processed,
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unsigned long int_parm)
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{
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struct zfcp_adapter *adapter;
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struct zfcp_qdio_queue *queue;
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adapter = (struct zfcp_adapter *) int_parm;
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queue = &adapter->request_queue;
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ZFCP_LOG_DEBUG("adapter %s, first=%d, elements_processed=%d\n",
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zfcp_get_busid_by_adapter(adapter),
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first_element, elements_processed);
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if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
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siga_error, first_element,
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elements_processed)))
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goto out;
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/*
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* we stored address of struct zfcp_adapter data structure
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* associated with irq in int_parm
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*/
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/* cleanup all SBALs being program-owned now */
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zfcp_qdio_zero_sbals(queue->buffer, first_element, elements_processed);
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/* increase free space in outbound queue */
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atomic_add(elements_processed, &queue->free_count);
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ZFCP_LOG_DEBUG("free_count=%d\n", atomic_read(&queue->free_count));
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wake_up(&adapter->request_wq);
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ZFCP_LOG_DEBUG("elements_processed=%d, free count=%d\n",
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elements_processed, atomic_read(&queue->free_count));
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out:
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return;
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}
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/**
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* zfcp_qdio_reqid_check - checks for valid reqids.
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*/
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static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
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unsigned long req_id)
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{
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struct zfcp_fsf_req *fsf_req;
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unsigned long flags;
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debug_long_event(adapter->erp_dbf, 4, req_id);
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spin_lock_irqsave(&adapter->req_list_lock, flags);
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fsf_req = zfcp_reqlist_find(adapter, req_id);
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if (!fsf_req)
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/*
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* Unknown request means that we have potentially memory
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* corruption and must stop the machine immediatly.
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*/
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panic("error: unknown request id (%ld) on adapter %s.\n",
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req_id, zfcp_get_busid_by_adapter(adapter));
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zfcp_reqlist_remove(adapter, fsf_req);
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atomic_dec(&adapter->reqs_active);
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spin_unlock_irqrestore(&adapter->req_list_lock, flags);
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/* finish the FSF request */
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zfcp_fsf_req_complete(fsf_req);
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}
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/*
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* function: zfcp_qdio_response_handler
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*
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* purpose: is called by QDIO layer for completed SBALs in response queue
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*
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* returns: (void)
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*/
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static void
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zfcp_qdio_response_handler(struct ccw_device *ccw_device,
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unsigned int status,
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unsigned int qdio_error,
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unsigned int siga_error,
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unsigned int queue_number,
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int first_element,
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int elements_processed,
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unsigned long int_parm)
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{
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struct zfcp_adapter *adapter;
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struct zfcp_qdio_queue *queue;
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int buffer_index;
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int i;
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struct qdio_buffer *buffer;
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int retval = 0;
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u8 count;
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u8 start;
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volatile struct qdio_buffer_element *buffere = NULL;
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int buffere_index;
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adapter = (struct zfcp_adapter *) int_parm;
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queue = &adapter->response_queue;
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if (unlikely(zfcp_qdio_handler_error_check(adapter, status, qdio_error,
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siga_error, first_element,
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elements_processed)))
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goto out;
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/*
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* we stored address of struct zfcp_adapter data structure
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* associated with irq in int_parm
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*/
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buffere = &(queue->buffer[first_element]->element[0]);
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ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags);
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/*
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* go through all SBALs from input queue currently
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* returned by QDIO layer
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*/
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for (i = 0; i < elements_processed; i++) {
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buffer_index = first_element + i;
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buffer_index %= QDIO_MAX_BUFFERS_PER_Q;
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buffer = queue->buffer[buffer_index];
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/* go through all SBALEs of SBAL */
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for (buffere_index = 0;
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buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER;
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buffere_index++) {
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/* look for QDIO request identifiers in SB */
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buffere = &buffer->element[buffere_index];
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zfcp_qdio_reqid_check(adapter,
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(unsigned long) buffere->addr);
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/*
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* A single used SBALE per inbound SBALE has been
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* implemented by QDIO so far. Hope they will
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* do some optimisation. Will need to change to
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* unlikely() then.
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*/
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if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY))
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break;
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};
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if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) {
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ZFCP_LOG_NORMAL("bug: End of inbound data "
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"not marked!\n");
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}
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}
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/*
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* put range of SBALs back to response queue
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* (including SBALs which have already been free before)
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*/
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count = atomic_read(&queue->free_count) + elements_processed;
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start = queue->free_index;
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ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
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"queue_no=%i, index_in_queue=%i, count=%i, "
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"buffers=0x%lx\n",
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zfcp_get_busid_by_adapter(adapter),
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QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
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0, start, count, (unsigned long) &queue->buffer[start]);
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retval = do_QDIO(ccw_device,
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QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
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0, start, count, NULL);
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if (unlikely(retval)) {
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atomic_set(&queue->free_count, count);
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ZFCP_LOG_DEBUG("clearing of inbound data regions failed, "
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"queues may be down "
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"(count=%d, start=%d, retval=%d)\n",
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count, start, retval);
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} else {
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queue->free_index += count;
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queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;
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atomic_set(&queue->free_count, 0);
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ZFCP_LOG_TRACE("%i buffers enqueued to response "
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"queue at position %i\n", count, start);
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}
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out:
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return;
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}
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/**
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* zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue
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* @queue: queue from which SBALE should be returned
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* @sbal: specifies number of SBAL in queue
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* @sbale: specifes number of SBALE in SBAL
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*/
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static inline volatile struct qdio_buffer_element *
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zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale)
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{
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return &queue->buffer[sbal]->element[sbale];
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}
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/**
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* zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for
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* a struct zfcp_fsf_req
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*/
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volatile struct qdio_buffer_element *
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zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
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{
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return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue,
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sbal, sbale);
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}
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/**
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* zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for
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* a struct zfcp_fsf_req
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*/
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static inline volatile struct qdio_buffer_element *
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zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
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{
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return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue,
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sbal, sbale);
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}
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/**
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* zfcp_qdio_sbale_curr - return current SBALE on request_queue for
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* a struct zfcp_fsf_req
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*/
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volatile struct qdio_buffer_element *
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zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req)
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{
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return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr,
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fsf_req->sbale_curr);
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}
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/**
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* zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used
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* on the request_queue for a struct zfcp_fsf_req
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* @fsf_req: the number of the last SBAL that can be used is stored herein
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* @max_sbals: used to pass an upper limit for the number of SBALs
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*
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* Note: We can assume at least one free SBAL in the request_queue when called.
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*/
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static void
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zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
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{
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int count = atomic_read(&fsf_req->adapter->request_queue.free_count);
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count = min(count, max_sbals);
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fsf_req->sbal_last = fsf_req->sbal_first;
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fsf_req->sbal_last += (count - 1);
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fsf_req->sbal_last %= QDIO_MAX_BUFFERS_PER_Q;
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}
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/**
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* zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a
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* request
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* @fsf_req: zfcp_fsf_req to be processed
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* @sbtype: SBAL flags which have to be set in first SBALE of new SBAL
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*
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* This function changes sbal_curr, sbale_curr, sbal_number of fsf_req.
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*/
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static volatile struct qdio_buffer_element *
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zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
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{
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volatile struct qdio_buffer_element *sbale;
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/* set last entry flag in current SBALE of current SBAL */
|
|
sbale = zfcp_qdio_sbale_curr(fsf_req);
|
|
sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
|
|
|
|
/* don't exceed last allowed SBAL */
|
|
if (fsf_req->sbal_curr == fsf_req->sbal_last)
|
|
return NULL;
|
|
|
|
/* set chaining flag in first SBALE of current SBAL */
|
|
sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
|
|
sbale->flags |= SBAL_FLAGS0_MORE_SBALS;
|
|
|
|
/* calculate index of next SBAL */
|
|
fsf_req->sbal_curr++;
|
|
fsf_req->sbal_curr %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
|
/* keep this requests number of SBALs up-to-date */
|
|
fsf_req->sbal_number++;
|
|
|
|
/* start at first SBALE of new SBAL */
|
|
fsf_req->sbale_curr = 0;
|
|
|
|
/* set storage-block type for new SBAL */
|
|
sbale = zfcp_qdio_sbale_curr(fsf_req);
|
|
sbale->flags |= sbtype;
|
|
|
|
return sbale;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbale_next - switch to next SBALE, chain SBALs if needed
|
|
*/
|
|
static volatile struct qdio_buffer_element *
|
|
zfcp_qdio_sbale_next(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
|
|
{
|
|
if (fsf_req->sbale_curr == ZFCP_LAST_SBALE_PER_SBAL)
|
|
return zfcp_qdio_sbal_chain(fsf_req, sbtype);
|
|
|
|
fsf_req->sbale_curr++;
|
|
|
|
return zfcp_qdio_sbale_curr(fsf_req);
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbals_zero - initialize SBALs between first and last in queue
|
|
* with zero from
|
|
*/
|
|
static int
|
|
zfcp_qdio_sbals_zero(struct zfcp_qdio_queue *queue, int first, int last)
|
|
{
|
|
struct qdio_buffer **buf = queue->buffer;
|
|
int curr = first;
|
|
int count = 0;
|
|
|
|
for(;;) {
|
|
curr %= QDIO_MAX_BUFFERS_PER_Q;
|
|
count++;
|
|
memset(buf[curr], 0, sizeof(struct qdio_buffer));
|
|
if (curr == last)
|
|
break;
|
|
curr++;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
|
|
/**
|
|
* zfcp_qdio_sbals_wipe - reset all changes in SBALs for an fsf_req
|
|
*/
|
|
static inline int
|
|
zfcp_qdio_sbals_wipe(struct zfcp_fsf_req *fsf_req)
|
|
{
|
|
return zfcp_qdio_sbals_zero(&fsf_req->adapter->request_queue,
|
|
fsf_req->sbal_first, fsf_req->sbal_curr);
|
|
}
|
|
|
|
|
|
/**
|
|
* zfcp_qdio_sbale_fill - set address and lenght in current SBALE
|
|
* on request_queue
|
|
*/
|
|
static void
|
|
zfcp_qdio_sbale_fill(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
|
|
void *addr, int length)
|
|
{
|
|
volatile struct qdio_buffer_element *sbale;
|
|
|
|
sbale = zfcp_qdio_sbale_curr(fsf_req);
|
|
sbale->addr = addr;
|
|
sbale->length = length;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbals_from_segment - map memory segment to SBALE(s)
|
|
* @fsf_req: request to be processed
|
|
* @sbtype: SBALE flags
|
|
* @start_addr: address of memory segment
|
|
* @total_length: length of memory segment
|
|
*
|
|
* Alignment and length of the segment determine how many SBALEs are needed
|
|
* for the memory segment.
|
|
*/
|
|
static int
|
|
zfcp_qdio_sbals_from_segment(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
|
|
void *start_addr, unsigned long total_length)
|
|
{
|
|
unsigned long remaining, length;
|
|
void *addr;
|
|
|
|
/* split segment up heeding page boundaries */
|
|
for (addr = start_addr, remaining = total_length; remaining > 0;
|
|
addr += length, remaining -= length) {
|
|
/* get next free SBALE for new piece */
|
|
if (NULL == zfcp_qdio_sbale_next(fsf_req, sbtype)) {
|
|
/* no SBALE left, clean up and leave */
|
|
zfcp_qdio_sbals_wipe(fsf_req);
|
|
return -EINVAL;
|
|
}
|
|
/* calculate length of new piece */
|
|
length = min(remaining,
|
|
(PAGE_SIZE - ((unsigned long) addr &
|
|
(PAGE_SIZE - 1))));
|
|
/* fill current SBALE with calculated piece */
|
|
zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length);
|
|
}
|
|
return total_length;
|
|
}
|
|
|
|
|
|
/**
|
|
* zfcp_qdio_sbals_from_sg - fill SBALs from scatter-gather list
|
|
* @fsf_req: request to be processed
|
|
* @sbtype: SBALE flags
|
|
* @sg: scatter-gather list
|
|
* @sg_count: number of elements in scatter-gather list
|
|
* @max_sbals: upper bound for number of SBALs to be used
|
|
*/
|
|
int
|
|
zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
|
|
struct scatterlist *sg, int sg_count, int max_sbals)
|
|
{
|
|
int sg_index;
|
|
struct scatterlist *sg_segment;
|
|
int retval;
|
|
volatile struct qdio_buffer_element *sbale;
|
|
int bytes = 0;
|
|
|
|
/* figure out last allowed SBAL */
|
|
zfcp_qdio_sbal_limit(fsf_req, max_sbals);
|
|
|
|
/* set storage-block type for current SBAL */
|
|
sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_curr, 0);
|
|
sbale->flags |= sbtype;
|
|
|
|
/* process all segements of scatter-gather list */
|
|
for (sg_index = 0, sg_segment = sg, bytes = 0;
|
|
sg_index < sg_count;
|
|
sg_index++, sg_segment++) {
|
|
retval = zfcp_qdio_sbals_from_segment(
|
|
fsf_req,
|
|
sbtype,
|
|
zfcp_sg_to_address(sg_segment),
|
|
sg_segment->length);
|
|
if (retval < 0) {
|
|
bytes = retval;
|
|
goto out;
|
|
} else
|
|
bytes += retval;
|
|
}
|
|
/* assume that no other SBALEs are to follow in the same SBAL */
|
|
sbale = zfcp_qdio_sbale_curr(fsf_req);
|
|
sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
|
|
out:
|
|
return bytes;
|
|
}
|
|
|
|
|
|
/**
|
|
* zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command
|
|
* @fsf_req: request to be processed
|
|
* @sbtype: SBALE flags
|
|
* @scsi_cmnd: either scatter-gather list or buffer contained herein is used
|
|
* to fill SBALs
|
|
*/
|
|
int
|
|
zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req,
|
|
unsigned long sbtype, struct scsi_cmnd *scsi_cmnd)
|
|
{
|
|
if (scsi_sg_count(scsi_cmnd))
|
|
return zfcp_qdio_sbals_from_sg(fsf_req, sbtype,
|
|
scsi_sglist(scsi_cmnd),
|
|
scsi_sg_count(scsi_cmnd),
|
|
ZFCP_MAX_SBALS_PER_REQ);
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed
|
|
*/
|
|
int
|
|
zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue,
|
|
struct zfcp_fsf_req *fsf_req)
|
|
{
|
|
int new_distance_from_int;
|
|
int pci_pos;
|
|
volatile struct qdio_buffer_element *sbale;
|
|
|
|
new_distance_from_int = req_queue->distance_from_int +
|
|
fsf_req->sbal_number;
|
|
|
|
if (unlikely(new_distance_from_int >= ZFCP_QDIO_PCI_INTERVAL)) {
|
|
new_distance_from_int %= ZFCP_QDIO_PCI_INTERVAL;
|
|
pci_pos = fsf_req->sbal_first;
|
|
pci_pos += fsf_req->sbal_number;
|
|
pci_pos -= new_distance_from_int;
|
|
pci_pos -= 1;
|
|
pci_pos %= QDIO_MAX_BUFFERS_PER_Q;
|
|
sbale = zfcp_qdio_sbale_req(fsf_req, pci_pos, 0);
|
|
sbale->flags |= SBAL_FLAGS0_PCI;
|
|
}
|
|
return new_distance_from_int;
|
|
}
|
|
|
|
/*
|
|
* function: zfcp_zero_sbals
|
|
*
|
|
* purpose: zeros specified range of SBALs
|
|
*
|
|
* returns:
|
|
*/
|
|
void
|
|
zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count)
|
|
{
|
|
int cur_pos;
|
|
int index;
|
|
|
|
for (cur_pos = first; cur_pos < (first + clean_count); cur_pos++) {
|
|
index = cur_pos % QDIO_MAX_BUFFERS_PER_Q;
|
|
memset(buf[index], 0, sizeof (struct qdio_buffer));
|
|
ZFCP_LOG_TRACE("zeroing BUFFER %d at address %p\n",
|
|
index, buf[index]);
|
|
}
|
|
}
|
|
|
|
#undef ZFCP_LOG_AREA
|