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@@ -1,241 +1,92 @@
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/*
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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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+ * zfcp device driver
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*
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- * (C) Copyright IBM Corp. 2002, 2006
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+ * Setup and helper functions to access QDIO.
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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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+ * Copyright IBM Corporation 2002, 2008
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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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-
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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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-
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-#define ZFCP_LOG_AREA ZFCP_LOG_AREA_QDIO
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+/* FIXME(tune): free space should be one max. SBAL chain plus what? */
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+#define ZFCP_QDIO_PCI_INTERVAL (QDIO_MAX_BUFFERS_PER_Q \
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+ - (ZFCP_MAX_SBALS_PER_REQ + 4))
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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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-
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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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-/*
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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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+static int zfcp_qdio_buffers_enqueue(struct qdio_buffer **sbal)
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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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+ sbal[pos] = (struct qdio_buffer *) get_zeroed_page(GFP_KERNEL);
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+ if (!sbal[pos])
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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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+ sbal[pos] = sbal[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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+static volatile struct qdio_buffer_element *
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+zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
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{
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- int ret;
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-
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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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+ return &q->sbal[sbal_idx]->element[sbale_idx];
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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_qdio_free - free memory used by request- and resposne queue
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+ * @adapter: pointer to the zfcp_adapter structure
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+ */
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+void zfcp_qdio_free(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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-
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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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+ struct qdio_buffer **sbal_req, **sbal_resp;
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+ int p;
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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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+ if (adapter->ccw_device)
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+ qdio_free(adapter->ccw_device);
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- init_data = &adapter->qdio_init_data;
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+ sbal_req = adapter->req_q.sbal;
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+ sbal_resp = adapter->resp_q.sbal;
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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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-
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- return qdio_allocate(init_data);
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+ for (p = 0; p < QDIO_MAX_BUFFERS_PER_Q; p += QBUFF_PER_PAGE) {
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+ free_page((unsigned long) sbal_req[p]);
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+ free_page((unsigned long) sbal_resp[p]);
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+ }
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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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+static void zfcp_qdio_handler_error(struct zfcp_adapter *adapter, u8 id)
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{
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- int retval = 0;
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+ dev_warn(&adapter->ccw_device->dev, "QDIO problem occurred.\n");
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- if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
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- retval = -EIO;
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-
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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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-
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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(adapter,
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- ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
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- ZFCP_STATUS_COMMON_ERP_FAILED, 140,
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- NULL);
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- }
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- return retval;
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+ zfcp_erp_adapter_reopen(adapter,
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+ ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED |
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+ ZFCP_STATUS_COMMON_ERP_FAILED, id, NULL);
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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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+static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int status,
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+ unsigned int qdio_err, unsigned int siga_err,
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+ unsigned int queue_no, int first, int count,
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+ unsigned long 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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-
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- adapter = (struct zfcp_adapter *) int_parm;
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- queue = &adapter->request_queue;
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+ struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
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+ struct zfcp_qdio_queue *queue = &adapter->req_q;
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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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-
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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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+ if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
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+ zfcp_hba_dbf_event_qdio(adapter, status, qdio_err, siga_err,
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+ first, count);
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+ zfcp_qdio_handler_error(adapter, 140);
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+ return;
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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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+ zfcp_qdio_zero_sbals(queue->sbal, first, count);
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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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+ atomic_add(count, &queue->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, int sbal)
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+ unsigned long req_id, int sbal_idx)
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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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@@ -248,204 +99,117 @@ static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
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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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+ panic("error: unknown request id (%lx) 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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- fsf_req->sbal_response = sbal;
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- /* finish the FSF request */
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+ fsf_req->sbal_response = sbal_idx;
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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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+static void zfcp_qdio_resp_put_back(struct zfcp_adapter *adapter, int processed)
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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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-
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- adapter = (struct zfcp_adapter *) int_parm;
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- queue = &adapter->response_queue;
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-
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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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+ struct zfcp_qdio_queue *queue = &adapter->resp_q;
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+ struct ccw_device *cdev = adapter->ccw_device;
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+ u8 count, start = queue->first;
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+ unsigned int retval;
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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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+ count = atomic_read(&queue->count) + processed;
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+
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+ retval = do_QDIO(cdev, QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
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+ 0, start, count, NULL);
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+
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+ if (unlikely(retval)) {
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+ atomic_set(&queue->count, count);
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+ /* FIXME: Recover this with an adapter reopen? */
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+ } else {
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+ queue->first += count;
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+ queue->first %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
+ atomic_set(&queue->count, 0);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int status,
|
|
|
+ unsigned int qdio_err, unsigned int siga_err,
|
|
|
+ unsigned int queue_no, int first, int count,
|
|
|
+ unsigned long parm)
|
|
|
+{
|
|
|
+ struct zfcp_adapter *adapter = (struct zfcp_adapter *) parm;
|
|
|
+ struct zfcp_qdio_queue *queue = &adapter->resp_q;
|
|
|
+ volatile struct qdio_buffer_element *sbale;
|
|
|
+ int sbal_idx, sbale_idx, sbal_no;
|
|
|
+
|
|
|
+ if (unlikely(status & QDIO_STATUS_LOOK_FOR_ERROR)) {
|
|
|
+ zfcp_hba_dbf_event_qdio(adapter, status, qdio_err, siga_err,
|
|
|
+ first, count);
|
|
|
+ zfcp_qdio_handler_error(adapter, 147);
|
|
|
+ return;
|
|
|
+ }
|
|
|
|
|
|
- buffere = &(queue->buffer[first_element]->element[0]);
|
|
|
- ZFCP_LOG_DEBUG("first BUFFERE flags=0x%x\n", buffere->flags);
|
|
|
/*
|
|
|
* go through all SBALs from input queue currently
|
|
|
* returned by QDIO layer
|
|
|
*/
|
|
|
-
|
|
|
- for (i = 0; i < elements_processed; i++) {
|
|
|
-
|
|
|
- buffer_index = first_element + i;
|
|
|
- buffer_index %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
- buffer = queue->buffer[buffer_index];
|
|
|
+ for (sbal_no = 0; sbal_no < count; sbal_no++) {
|
|
|
+ sbal_idx = (first + sbal_no) % QDIO_MAX_BUFFERS_PER_Q;
|
|
|
|
|
|
/* go through all SBALEs of SBAL */
|
|
|
- for (buffere_index = 0;
|
|
|
- buffere_index < QDIO_MAX_ELEMENTS_PER_BUFFER;
|
|
|
- buffere_index++) {
|
|
|
-
|
|
|
- /* look for QDIO request identifiers in SB */
|
|
|
- buffere = &buffer->element[buffere_index];
|
|
|
+ for (sbale_idx = 0; sbale_idx < QDIO_MAX_ELEMENTS_PER_BUFFER;
|
|
|
+ sbale_idx++) {
|
|
|
+ sbale = zfcp_qdio_sbale(queue, sbal_idx, sbale_idx);
|
|
|
zfcp_qdio_reqid_check(adapter,
|
|
|
- (unsigned long) buffere->addr, i);
|
|
|
-
|
|
|
- /*
|
|
|
- * A single used SBALE per inbound SBALE has been
|
|
|
- * implemented by QDIO so far. Hope they will
|
|
|
- * do some optimisation. Will need to change to
|
|
|
- * unlikely() then.
|
|
|
- */
|
|
|
- if (likely(buffere->flags & SBAL_FLAGS_LAST_ENTRY))
|
|
|
+ (unsigned long) sbale->addr,
|
|
|
+ sbal_idx);
|
|
|
+ if (likely(sbale->flags & SBAL_FLAGS_LAST_ENTRY))
|
|
|
break;
|
|
|
};
|
|
|
|
|
|
- if (unlikely(!(buffere->flags & SBAL_FLAGS_LAST_ENTRY))) {
|
|
|
- ZFCP_LOG_NORMAL("bug: End of inbound data "
|
|
|
- "not marked!\n");
|
|
|
- }
|
|
|
+ if (unlikely(!(sbale->flags & SBAL_FLAGS_LAST_ENTRY)))
|
|
|
+ dev_warn(&adapter->ccw_device->dev,
|
|
|
+ "Protocol violation by adapter. "
|
|
|
+ "Continuing operations.\n");
|
|
|
}
|
|
|
|
|
|
/*
|
|
|
* put range of SBALs back to response queue
|
|
|
* (including SBALs which have already been free before)
|
|
|
*/
|
|
|
- count = atomic_read(&queue->free_count) + elements_processed;
|
|
|
- start = queue->free_index;
|
|
|
-
|
|
|
- ZFCP_LOG_TRACE("calling do_QDIO on adapter %s (flags=0x%x, "
|
|
|
- "queue_no=%i, index_in_queue=%i, count=%i, "
|
|
|
- "buffers=0x%lx\n",
|
|
|
- zfcp_get_busid_by_adapter(adapter),
|
|
|
- QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
|
|
|
- 0, start, count, (unsigned long) &queue->buffer[start]);
|
|
|
-
|
|
|
- retval = do_QDIO(ccw_device,
|
|
|
- QDIO_FLAG_SYNC_INPUT | QDIO_FLAG_UNDER_INTERRUPT,
|
|
|
- 0, start, count, NULL);
|
|
|
-
|
|
|
- if (unlikely(retval)) {
|
|
|
- atomic_set(&queue->free_count, count);
|
|
|
- ZFCP_LOG_DEBUG("clearing of inbound data regions failed, "
|
|
|
- "queues may be down "
|
|
|
- "(count=%d, start=%d, retval=%d)\n",
|
|
|
- count, start, retval);
|
|
|
- } else {
|
|
|
- queue->free_index += count;
|
|
|
- queue->free_index %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
- atomic_set(&queue->free_count, 0);
|
|
|
- ZFCP_LOG_TRACE("%i buffers enqueued to response "
|
|
|
- "queue at position %i\n", count, start);
|
|
|
- }
|
|
|
- out:
|
|
|
- return;
|
|
|
+ zfcp_qdio_resp_put_back(adapter, count);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
- * zfcp_qdio_sbale_get - return pointer to SBALE of qdio_queue
|
|
|
- * @queue: queue from which SBALE should be returned
|
|
|
- * @sbal: specifies number of SBAL in queue
|
|
|
- * @sbale: specifes number of SBALE in SBAL
|
|
|
- */
|
|
|
-static inline volatile struct qdio_buffer_element *
|
|
|
-zfcp_qdio_sbale_get(struct zfcp_qdio_queue *queue, int sbal, int sbale)
|
|
|
-{
|
|
|
- return &queue->buffer[sbal]->element[sbale];
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * zfcp_qdio_sbale_req - return pointer to SBALE of request_queue for
|
|
|
- * a struct zfcp_fsf_req
|
|
|
+ * zfcp_qdio_sbale_req - return ptr to SBALE of req_q for a struct zfcp_fsf_req
|
|
|
+ * @fsf_req: pointer to struct fsf_req
|
|
|
+ * Returns: pointer to qdio_buffer_element (SBALE) structure
|
|
|
*/
|
|
|
volatile struct qdio_buffer_element *
|
|
|
-zfcp_qdio_sbale_req(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
|
|
|
-{
|
|
|
- return zfcp_qdio_sbale_get(&fsf_req->adapter->request_queue,
|
|
|
- sbal, sbale);
|
|
|
-}
|
|
|
-
|
|
|
-/**
|
|
|
- * zfcp_qdio_sbale_resp - return pointer to SBALE of response_queue for
|
|
|
- * a struct zfcp_fsf_req
|
|
|
- */
|
|
|
-static inline volatile struct qdio_buffer_element *
|
|
|
-zfcp_qdio_sbale_resp(struct zfcp_fsf_req *fsf_req, int sbal, int sbale)
|
|
|
+zfcp_qdio_sbale_req(struct zfcp_fsf_req *req)
|
|
|
{
|
|
|
- return zfcp_qdio_sbale_get(&fsf_req->adapter->response_queue,
|
|
|
- sbal, sbale);
|
|
|
+ return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last, 0);
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
- * zfcp_qdio_sbale_curr - return current SBALE on request_queue for
|
|
|
- * a struct zfcp_fsf_req
|
|
|
+ * zfcp_qdio_sbale_curr - return curr SBALE on req_q for a struct zfcp_fsf_req
|
|
|
+ * @fsf_req: pointer to struct fsf_req
|
|
|
+ * Returns: pointer to qdio_buffer_element (SBALE) structure
|
|
|
*/
|
|
|
volatile struct qdio_buffer_element *
|
|
|
-zfcp_qdio_sbale_curr(struct zfcp_fsf_req *fsf_req)
|
|
|
+zfcp_qdio_sbale_curr(struct zfcp_fsf_req *req)
|
|
|
{
|
|
|
- return zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last,
|
|
|
- fsf_req->sbale_curr);
|
|
|
+ return zfcp_qdio_sbale(&req->adapter->req_q, req->sbal_last,
|
|
|
+ req->sbale_curr);
|
|
|
}
|
|
|
|
|
|
-/**
|
|
|
- * zfcp_qdio_sbal_limit - determine maximum number of SBALs that can be used
|
|
|
- * on the request_queue for a struct zfcp_fsf_req
|
|
|
- * @fsf_req: the number of the last SBAL that can be used is stored herein
|
|
|
- * @max_sbals: used to pass an upper limit for the number of SBALs
|
|
|
- *
|
|
|
- * Note: We can assume at least one free SBAL in the request_queue when called.
|
|
|
- */
|
|
|
-static void
|
|
|
-zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
|
|
|
+static void zfcp_qdio_sbal_limit(struct zfcp_fsf_req *fsf_req, int max_sbals)
|
|
|
{
|
|
|
- int count = atomic_read(&fsf_req->adapter->request_queue.free_count);
|
|
|
+ int count = atomic_read(&fsf_req->adapter->req_q.count);
|
|
|
count = min(count, max_sbals);
|
|
|
- fsf_req->sbal_limit = fsf_req->sbal_first;
|
|
|
- fsf_req->sbal_limit += (count - 1);
|
|
|
- fsf_req->sbal_limit %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
+ fsf_req->sbal_limit = (fsf_req->sbal_first + count - 1)
|
|
|
+ % QDIO_MAX_BUFFERS_PER_Q;
|
|
|
}
|
|
|
|
|
|
-/**
|
|
|
- * zfcp_qdio_sbal_chain - chain SBALs if more than one SBAL is needed for a
|
|
|
- * request
|
|
|
- * @fsf_req: zfcp_fsf_req to be processed
|
|
|
- * @sbtype: SBAL flags which have to be set in first SBALE of new SBAL
|
|
|
- *
|
|
|
- * This function changes sbal_last, sbale_curr, sbal_number of fsf_req.
|
|
|
- */
|
|
|
static volatile struct qdio_buffer_element *
|
|
|
zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
|
|
|
{
|
|
|
@@ -460,7 +224,7 @@ zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long sbtype)
|
|
|
return NULL;
|
|
|
|
|
|
/* set chaining flag in first SBALE of current SBAL */
|
|
|
- sbale = zfcp_qdio_sbale_req(fsf_req, fsf_req->sbal_last, 0);
|
|
|
+ sbale = zfcp_qdio_sbale_req(fsf_req);
|
|
|
sbale->flags |= SBAL_FLAGS0_MORE_SBALS;
|
|
|
|
|
|
/* calculate index of next SBAL */
|
|
|
@@ -480,214 +244,271 @@ zfcp_qdio_sbal_chain(struct zfcp_fsf_req *fsf_req, unsigned long 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)
|
|
|
+static void zfcp_qdio_undo_sbals(struct zfcp_fsf_req *fsf_req)
|
|
|
{
|
|
|
- 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;
|
|
|
+ struct qdio_buffer **sbal = fsf_req->adapter->req_q.sbal;
|
|
|
+ int first = fsf_req->sbal_first;
|
|
|
+ int last = fsf_req->sbal_last;
|
|
|
+ int count = (last - first + QDIO_MAX_BUFFERS_PER_Q) %
|
|
|
+ QDIO_MAX_BUFFERS_PER_Q + 1;
|
|
|
+ zfcp_qdio_zero_sbals(sbal, first, 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_last);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-/**
|
|
|
- * zfcp_qdio_sbale_fill - set address and length 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)
|
|
|
+static int zfcp_qdio_fill_sbals(struct zfcp_fsf_req *fsf_req,
|
|
|
+ unsigned int sbtype, void *start_addr,
|
|
|
+ unsigned int total_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 */
|
|
|
+ /* split segment up */
|
|
|
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);
|
|
|
+ sbale = zfcp_qdio_sbale_next(fsf_req, sbtype);
|
|
|
+ if (!sbale) {
|
|
|
+ zfcp_qdio_undo_sbals(fsf_req);
|
|
|
return -EINVAL;
|
|
|
}
|
|
|
- /* calculate length of new piece */
|
|
|
+
|
|
|
+ /* new piece must not exceed next page boundary */
|
|
|
length = min(remaining,
|
|
|
- (PAGE_SIZE - ((unsigned long) addr &
|
|
|
+ (PAGE_SIZE - ((unsigned long)addr &
|
|
|
(PAGE_SIZE - 1))));
|
|
|
- /* fill current SBALE with calculated piece */
|
|
|
- zfcp_qdio_sbale_fill(fsf_req, sbtype, addr, length);
|
|
|
+ sbale->addr = addr;
|
|
|
+ sbale->length = length;
|
|
|
}
|
|
|
- return total_length;
|
|
|
+ return 0;
|
|
|
}
|
|
|
|
|
|
-
|
|
|
/**
|
|
|
* 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
|
|
|
+ * Returns: number of bytes, or error (negativ)
|
|
|
*/
|
|
|
-int
|
|
|
-zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
|
|
|
- struct scatterlist *sgl, int sg_count, int max_sbals)
|
|
|
+int zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
|
|
|
+ struct scatterlist *sg, int max_sbals)
|
|
|
{
|
|
|
- int sg_index;
|
|
|
- struct scatterlist *sg_segment;
|
|
|
- int retval;
|
|
|
volatile struct qdio_buffer_element *sbale;
|
|
|
- int bytes = 0;
|
|
|
+ int retval, 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_last, 0);
|
|
|
+ /* set storage-block type for this request */
|
|
|
+ sbale = zfcp_qdio_sbale_req(fsf_req);
|
|
|
sbale->flags |= sbtype;
|
|
|
|
|
|
- /* process all segements of scatter-gather list */
|
|
|
- for_each_sg(sgl, sg_segment, sg_count, sg_index) {
|
|
|
- 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;
|
|
|
+ for (; sg; sg = sg_next(sg)) {
|
|
|
+ retval = zfcp_qdio_fill_sbals(fsf_req, sbtype, sg_virt(sg),
|
|
|
+ sg->length);
|
|
|
+ if (retval < 0)
|
|
|
+ return retval;
|
|
|
+ bytes += sg->length;
|
|
|
}
|
|
|
+
|
|
|
/* 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
|
|
|
+ * zfcp_qdio_send - set PCI flag in first SBALE and send req to QDIO
|
|
|
+ * @fsf_req: pointer to struct zfcp_fsf_req
|
|
|
+ * Returns: 0 on success, error otherwise
|
|
|
*/
|
|
|
-int
|
|
|
-zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req,
|
|
|
- unsigned long sbtype, struct scsi_cmnd *scsi_cmnd)
|
|
|
+int zfcp_qdio_send(struct zfcp_fsf_req *fsf_req)
|
|
|
{
|
|
|
- return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, scsi_sglist(scsi_cmnd),
|
|
|
- scsi_sg_count(scsi_cmnd),
|
|
|
- ZFCP_MAX_SBALS_PER_REQ);
|
|
|
+ struct zfcp_adapter *adapter = fsf_req->adapter;
|
|
|
+ struct zfcp_qdio_queue *req_q = &adapter->req_q;
|
|
|
+ int first = fsf_req->sbal_first;
|
|
|
+ int count = fsf_req->sbal_number;
|
|
|
+ int retval, pci, pci_batch;
|
|
|
+ volatile struct qdio_buffer_element *sbale;
|
|
|
+
|
|
|
+ /* acknowledgements for transferred buffers */
|
|
|
+ pci_batch = req_q->pci_batch + count;
|
|
|
+ if (unlikely(pci_batch >= ZFCP_QDIO_PCI_INTERVAL)) {
|
|
|
+ pci_batch %= ZFCP_QDIO_PCI_INTERVAL;
|
|
|
+ pci = first + count - (pci_batch + 1);
|
|
|
+ pci %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
+ sbale = zfcp_qdio_sbale(req_q, pci, 0);
|
|
|
+ sbale->flags |= SBAL_FLAGS0_PCI;
|
|
|
+ }
|
|
|
+
|
|
|
+ retval = do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_OUTPUT, 0, first,
|
|
|
+ count, NULL);
|
|
|
+ if (unlikely(retval)) {
|
|
|
+ zfcp_qdio_zero_sbals(req_q->sbal, first, count);
|
|
|
+ return retval;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* account for transferred buffers */
|
|
|
+ atomic_sub(count, &req_q->count);
|
|
|
+ req_q->first += count;
|
|
|
+ req_q->first %= QDIO_MAX_BUFFERS_PER_Q;
|
|
|
+ req_q->pci_batch = pci_batch;
|
|
|
+ return 0;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
- * zfcp_qdio_determine_pci - set PCI flag in first SBALE on qdio queue if needed
|
|
|
+ * zfcp_qdio_zero_sbals - zero all sbals of the specified area and queue
|
|
|
+ * @buf: pointer to array of SBALS
|
|
|
+ * @first: integer specifying the SBAL number to start
|
|
|
+ * @count: integer specifying the number of SBALS to process
|
|
|
*/
|
|
|
-int
|
|
|
-zfcp_qdio_determine_pci(struct zfcp_qdio_queue *req_queue,
|
|
|
- struct zfcp_fsf_req *fsf_req)
|
|
|
+void zfcp_qdio_zero_sbals(struct qdio_buffer *sbal[], int first, int count)
|
|
|
{
|
|
|
- int new_distance_from_int;
|
|
|
- int pci_pos;
|
|
|
- volatile struct qdio_buffer_element *sbale;
|
|
|
+ int i, sbal_idx;
|
|
|
|
|
|
- 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;
|
|
|
+ for (i = first; i < first + count; i++) {
|
|
|
+ sbal_idx = i % QDIO_MAX_BUFFERS_PER_Q;
|
|
|
+ memset(sbal[sbal_idx], 0, sizeof(struct qdio_buffer));
|
|
|
}
|
|
|
- return new_distance_from_int;
|
|
|
}
|
|
|
|
|
|
-/*
|
|
|
- * function: zfcp_zero_sbals
|
|
|
- *
|
|
|
- * purpose: zeros specified range of SBALs
|
|
|
- *
|
|
|
- * returns:
|
|
|
+/**
|
|
|
+ * zfcp_qdio_allocate - allocate queue memory and initialize QDIO data
|
|
|
+ * @adapter: pointer to struct zfcp_adapter
|
|
|
+ * Returns: -ENOMEM on memory allocation error or return value from
|
|
|
+ * qdio_allocate
|
|
|
+ */
|
|
|
+int zfcp_qdio_allocate(struct zfcp_adapter *adapter)
|
|
|
+{
|
|
|
+ struct qdio_initialize *init_data;
|
|
|
+
|
|
|
+ if (zfcp_qdio_buffers_enqueue(adapter->req_q.sbal) ||
|
|
|
+ zfcp_qdio_buffers_enqueue(adapter->resp_q.sbal))
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ init_data = &adapter->qdio_init_data;
|
|
|
+
|
|
|
+ init_data->cdev = adapter->ccw_device;
|
|
|
+ init_data->q_format = QDIO_ZFCP_QFMT;
|
|
|
+ memcpy(init_data->adapter_name, zfcp_get_busid_by_adapter(adapter), 8);
|
|
|
+ ASCEBC(init_data->adapter_name, 8);
|
|
|
+ init_data->qib_param_field_format = 0;
|
|
|
+ init_data->qib_param_field = NULL;
|
|
|
+ init_data->input_slib_elements = NULL;
|
|
|
+ init_data->output_slib_elements = NULL;
|
|
|
+ init_data->min_input_threshold = 1;
|
|
|
+ init_data->max_input_threshold = 5000;
|
|
|
+ init_data->min_output_threshold = 1;
|
|
|
+ init_data->max_output_threshold = 1000;
|
|
|
+ init_data->no_input_qs = 1;
|
|
|
+ init_data->no_output_qs = 1;
|
|
|
+ init_data->input_handler = zfcp_qdio_int_resp;
|
|
|
+ init_data->output_handler = zfcp_qdio_int_req;
|
|
|
+ init_data->int_parm = (unsigned long) adapter;
|
|
|
+ init_data->flags = QDIO_INBOUND_0COPY_SBALS |
|
|
|
+ QDIO_OUTBOUND_0COPY_SBALS | QDIO_USE_OUTBOUND_PCIS;
|
|
|
+ init_data->input_sbal_addr_array =
|
|
|
+ (void **) (adapter->resp_q.sbal);
|
|
|
+ init_data->output_sbal_addr_array =
|
|
|
+ (void **) (adapter->req_q.sbal);
|
|
|
+
|
|
|
+ return qdio_allocate(init_data);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * zfcp_close_qdio - close qdio queues for an adapter
|
|
|
*/
|
|
|
-void
|
|
|
-zfcp_qdio_zero_sbals(struct qdio_buffer *buf[], int first, int clean_count)
|
|
|
+void zfcp_qdio_close(struct zfcp_adapter *adapter)
|
|
|
{
|
|
|
- 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]);
|
|
|
+ struct zfcp_qdio_queue *req_q;
|
|
|
+ int first, count;
|
|
|
+
|
|
|
+ if (!atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
|
|
|
+ return;
|
|
|
+
|
|
|
+ /* clear QDIOUP flag, thus do_QDIO is not called during qdio_shutdown */
|
|
|
+ req_q = &adapter->req_q;
|
|
|
+ write_lock_irq(&req_q->lock);
|
|
|
+ atomic_clear_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status);
|
|
|
+ write_unlock_irq(&req_q->lock);
|
|
|
+
|
|
|
+ while (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)
|
|
|
+ == -EINPROGRESS)
|
|
|
+ ssleep(1);
|
|
|
+
|
|
|
+ /* cleanup used outbound sbals */
|
|
|
+ count = atomic_read(&req_q->count);
|
|
|
+ if (count < QDIO_MAX_BUFFERS_PER_Q) {
|
|
|
+ first = (req_q->first + count) % QDIO_MAX_BUFFERS_PER_Q;
|
|
|
+ count = QDIO_MAX_BUFFERS_PER_Q - count;
|
|
|
+ zfcp_qdio_zero_sbals(req_q->sbal, first, count);
|
|
|
}
|
|
|
+ req_q->first = 0;
|
|
|
+ atomic_set(&req_q->count, 0);
|
|
|
+ req_q->pci_batch = 0;
|
|
|
+ adapter->resp_q.first = 0;
|
|
|
+ atomic_set(&adapter->resp_q.count, 0);
|
|
|
}
|
|
|
|
|
|
-#undef ZFCP_LOG_AREA
|
|
|
+/**
|
|
|
+ * zfcp_qdio_open - prepare and initialize response queue
|
|
|
+ * @adapter: pointer to struct zfcp_adapter
|
|
|
+ * Returns: 0 on success, otherwise -EIO
|
|
|
+ */
|
|
|
+int zfcp_qdio_open(struct zfcp_adapter *adapter)
|
|
|
+{
|
|
|
+ volatile struct qdio_buffer_element *sbale;
|
|
|
+ int cc;
|
|
|
+
|
|
|
+ if (atomic_test_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &adapter->status))
|
|
|
+ return -EIO;
|
|
|
+
|
|
|
+ if (qdio_establish(&adapter->qdio_init_data)) {
|
|
|
+ dev_err(&adapter->ccw_device->dev,
|
|
|
+ "Establish of QDIO queues failed.\n");
|
|
|
+ return -EIO;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (qdio_activate(adapter->ccw_device, 0)) {
|
|
|
+ dev_err(&adapter->ccw_device->dev,
|
|
|
+ "Activate of QDIO queues failed.\n");
|
|
|
+ goto failed_qdio;
|
|
|
+ }
|
|
|
+
|
|
|
+ for (cc = 0; cc < QDIO_MAX_BUFFERS_PER_Q; cc++) {
|
|
|
+ sbale = &(adapter->resp_q.sbal[cc]->element[0]);
|
|
|
+ sbale->length = 0;
|
|
|
+ sbale->flags = SBAL_FLAGS_LAST_ENTRY;
|
|
|
+ sbale->addr = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (do_QDIO(adapter->ccw_device, QDIO_FLAG_SYNC_INPUT, 0, 0,
|
|
|
+ QDIO_MAX_BUFFERS_PER_Q, NULL)) {
|
|
|
+ dev_err(&adapter->ccw_device->dev,
|
|
|
+ "Init of QDIO response queue failed.\n");
|
|
|
+ goto failed_qdio;
|
|
|
+ }
|
|
|
+
|
|
|
+ /* set index of first avalable SBALS / number of available SBALS */
|
|
|
+ adapter->req_q.first = 0;
|
|
|
+ atomic_set(&adapter->req_q.count, QDIO_MAX_BUFFERS_PER_Q);
|
|
|
+ adapter->req_q.pci_batch = 0;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+failed_qdio:
|
|
|
+ while (qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR)
|
|
|
+ == -EINPROGRESS)
|
|
|
+ ssleep(1);
|
|
|
+
|
|
|
+ return -EIO;
|
|
|
+}
|
Swen Schillig