FreeBSD/Linux Kernel Cross Reference
sys/dev/ocs_fc/ocs_io.c

     /*-
      * Copyright (c) 2017 Broadcom. All rights reserved.
      * The term "Broadcom" refers to Broadcom Limited and/or its subsidiaries.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are met:
      *
      * 1. Redistributions of source code must retain the above copyright notice,
      *    this list of conditions and the following disclaimer.
     *
     * 2. Redistributions in binary form must reproduce the above copyright notice,
     *    this list of conditions and the following disclaimer in the documentation
     *    and/or other materials provided with the distribution.
     *
     * 3. Neither the name of the copyright holder nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
     * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
     * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    /**
     * @file
     * Provide IO object allocation.
     */
    
    /*!
     * @defgroup io_alloc IO allocation
     */
    
    #include "ocs.h"
    #include "ocs_scsi.h"
    #include "ocs_els.h"
    #include "ocs_utils.h"
    
    void ocs_mgmt_io_list(ocs_textbuf_t *textbuf, void *io);
    void ocs_mgmt_io_get_all(ocs_textbuf_t *textbuf, void *io);
    int ocs_mgmt_io_get(ocs_textbuf_t *textbuf, char *parent, char *name, void *io);
    
    static ocs_mgmt_functions_t io_mgmt_functions = {
            .get_list_handler       =       ocs_mgmt_io_list,
            .get_handler            =       ocs_mgmt_io_get,
            .get_all_handler        =       ocs_mgmt_io_get_all,
    };
    
    /**
     * @brief IO pool.
     *
     * Structure encapsulating a pool of IO objects.
     *
     */
    
    struct ocs_io_pool_s {
            ocs_t *ocs;                     /* Pointer to device object */
            ocs_lock_t lock;                /* IO pool lock */
            uint32_t io_num_ios;            /* Total IOs allocated */
            ocs_pool_t *pool;
    };
    
    /**
     * @brief Create a pool of IO objects.
     *
     * @par Description
     * This function allocates memory in larger chucks called
     * "slabs" which are a fixed size. It calculates the number of IO objects that
     * fit within each "slab" and determines the number of "slabs" required to
     * allocate the number of IOs requested. Each of the slabs is allocated and
     * then it grabs each IO object within the slab and adds it to the free list.
     * Individual command, response and SGL DMA buffers are allocated for each IO.
     *
     *           "Slabs"
     *      +----------------+
     *      |                |
     *   +----------------+  |
     *   |    IO          |  |
     *   +----------------+  |
     *   |    ...         |  |
     *   +----------------+__+
     *   |    IO          |
     *   +----------------+
     *
     * @param ocs Driver instance's software context.
     * @param num_io Number of IO contexts to allocate.
     * @param num_sgl Number of SGL entries to allocate for each IO.
     *
     * @return Returns a pointer to a new ocs_io_pool_t on success,
     *         or NULL on failure.
    */
   
   ocs_io_pool_t *
   ocs_io_pool_create(ocs_t *ocs, uint32_t num_io, uint32_t num_sgl)
   {
           uint32_t i = 0;
           int32_t rc = -1;
           ocs_io_pool_t *io_pool;
   
           /* Allocate the IO pool */
           io_pool = ocs_malloc(ocs, sizeof(*io_pool), OCS_M_ZERO | OCS_M_NOWAIT);
           if (io_pool == NULL) {
                   ocs_log_err(ocs, "allocate of IO pool failed\n");
                   return NULL;
           }
   
           io_pool->ocs = ocs;
           io_pool->io_num_ios = num_io;
   
           /* initialize IO pool lock */
           ocs_lock_init(ocs, &io_pool->lock, "io_pool lock[%d]", ocs->instance_index);
   
           io_pool->pool = ocs_pool_alloc(ocs, sizeof(ocs_io_t), io_pool->io_num_ios, FALSE);
   
           for (i = 0; i < io_pool->io_num_ios; i++) {
                   ocs_io_t *io = ocs_pool_get_instance(io_pool->pool, i);
   
                   io->tag = i;
                   io->instance_index = i;
                   io->ocs = ocs;
   
                   /* allocate a command/response dma buffer */
                   if (ocs->enable_ini) {
                           rc = ocs_dma_alloc(ocs, &io->cmdbuf, SCSI_CMD_BUF_LENGTH, OCS_MIN_DMA_ALIGNMENT);
                           if (rc) {
                                   ocs_log_err(ocs, "ocs_dma_alloc cmdbuf failed\n");
                                   ocs_io_pool_free(io_pool);
                                   return NULL;
                           }
                   }
   
                   /* Allocate a response buffer */
                   rc = ocs_dma_alloc(ocs, &io->rspbuf, SCSI_RSP_BUF_LENGTH, OCS_MIN_DMA_ALIGNMENT);
                   if (rc) {
                           ocs_log_err(ocs, "ocs_dma_alloc cmdbuf failed\n");
                           ocs_io_pool_free(io_pool);
                           return NULL;
                   }
   
                   /* Allocate SGL */
                   io->sgl = ocs_malloc(ocs, sizeof(*io->sgl) * num_sgl, OCS_M_NOWAIT | OCS_M_ZERO);
                   if (io->sgl == NULL) {
                           ocs_log_err(ocs, "malloc sgl's failed\n");
                           ocs_io_pool_free(io_pool);
                           return NULL;
                   }
                   io->sgl_allocated = num_sgl;
                   io->sgl_count = 0;
   
                   /* Make IO backend call to initialize IO */
                   ocs_scsi_tgt_io_init(io);
                   ocs_scsi_ini_io_init(io);
                   
                   rc = ocs_dma_alloc(ocs, &io->els_req, OCS_ELS_REQ_LEN, OCS_MIN_DMA_ALIGNMENT);
                   if (rc) {
                           ocs_log_err(ocs, "ocs_dma_alloc els_req failed\n");
                           ocs_io_pool_free(io_pool);
                           return NULL;
                   }
   
                   rc = ocs_dma_alloc(ocs, &io->els_rsp, OCS_ELS_GID_PT_RSP_LEN, OCS_MIN_DMA_ALIGNMENT);
                   if (rc) {
                           ocs_log_err(ocs, "ocs_dma_alloc els_rsp failed\n");
                           ocs_io_pool_free(io_pool);
                           return NULL;
                   }
           }
   
           return io_pool;
   }
   
   /**
    * @brief Free IO objects pool
    *
    * @par Description
    * The pool of IO objects are freed.
    *
    * @param io_pool Pointer to IO pool object.
    *
    * @return Returns 0 on success, or a negative error code value on failure.
    */
   int32_t
   ocs_io_pool_free(ocs_io_pool_t *io_pool)
   {
           ocs_t *ocs;
           uint32_t i;
           ocs_io_t *io;
   
           if (io_pool != NULL) {
                   ocs = io_pool->ocs;
                   for (i = 0; i < io_pool->io_num_ios; i++) {
                           io = ocs_pool_get_instance(io_pool->pool, i);
                           if (!io)
                                   continue;
                           ocs_scsi_tgt_io_exit(io);
                           ocs_scsi_ini_io_exit(io);
                           if (io->sgl) {
                                   ocs_free(ocs, io->sgl, sizeof(*io->sgl) * io->sgl_allocated);
                           }
                           ocs_dma_free(ocs, &io->cmdbuf);
                           ocs_dma_free(ocs, &io->rspbuf);
                           ocs_dma_free(ocs, &io->els_req);
                           ocs_dma_free(ocs, &io->els_rsp);
                   }
   
                   if (io_pool->pool != NULL) {
                           ocs_pool_free(io_pool->pool);
                   }
                   ocs_lock_free(&io_pool->lock);
                   ocs_free(ocs, io_pool, sizeof(*io_pool));
                   ocs->xport->io_pool = NULL;
           }
   
           return 0;
   }
   
   uint32_t ocs_io_pool_allocated(ocs_io_pool_t *io_pool)
   {
           return io_pool->io_num_ios;
   }
   
   /**
    * @ingroup io_alloc
    * @brief Allocate an object used to track an IO.
    *
    * @param io_pool Pointer to the IO pool.
    *
    * @return Returns the pointer to a new object, or NULL if none available.
    */
   ocs_io_t *
   ocs_io_pool_io_alloc(ocs_io_pool_t *io_pool)
   {
           ocs_io_t *io = NULL;
           ocs_t *ocs;
   
           ocs_assert(io_pool, NULL);
   
           ocs = io_pool->ocs;
   
           ocs_lock(&io_pool->lock);
           if ((io = ocs_pool_get(io_pool->pool)) != NULL) {
                   ocs_unlock(&io_pool->lock);
   
                   io->io_type = OCS_IO_TYPE_MAX;
                   io->hio_type = OCS_HW_IO_MAX;
                   io->hio = NULL;
                   io->transferred = 0;
                   io->ocs = ocs;
                   io->timeout = 0;
                   io->sgl_count = 0;
                   io->tgt_task_tag = 0;
                   io->init_task_tag = 0;
                   io->hw_tag = 0;
                   io->display_name = "pending";
                   io->seq_init = 0;
                   io->els_req_free = 0;
                   io->mgmt_functions = &io_mgmt_functions;
                   io->io_free = 0;
                   ocs_atomic_add_return(&ocs->xport->io_active_count, 1);
                   ocs_atomic_add_return(&ocs->xport->io_total_alloc, 1);
           } else {
                   ocs_unlock(&io_pool->lock);
           }
           return io;
   }
   
   /**
    * @ingroup io_alloc
    * @brief Free an object used to track an IO.
    *
    * @param io_pool Pointer to IO pool object.
    * @param io Pointer to the IO object.
    */
   void
   ocs_io_pool_io_free(ocs_io_pool_t *io_pool, ocs_io_t *io)
   {
           ocs_t *ocs;
           ocs_hw_io_t *hio = NULL;
   
           ocs_assert(io_pool);
   
           ocs = io_pool->ocs;
   
           ocs_lock(&io_pool->lock);
                   hio = io->hio;
                   io->hio = NULL;
                   ocs_pool_put(io_pool->pool, io);
           ocs_unlock(&io_pool->lock);
   
           if (hio) {
                   ocs_hw_io_free(&ocs->hw, hio);
           }
           io->io_free = 1;
           ocs_atomic_sub_return(&ocs->xport->io_active_count, 1);
           ocs_atomic_add_return(&ocs->xport->io_total_free, 1);
   }
   
   /**
    * @ingroup io_alloc
    * @brief Find an I/O given it's node and ox_id.
    *
    * @param ocs Driver instance's software context.
    * @param node Pointer to node.
    * @param ox_id OX_ID to find.
    * @param rx_id RX_ID to find (0xffff for unassigned).
    */
   ocs_io_t *
   ocs_io_find_tgt_io(ocs_t *ocs, ocs_node_t *node, uint16_t ox_id, uint16_t rx_id)
   {
           ocs_io_t        *io = NULL;
   
           ocs_lock(&node->active_ios_lock);
                   ocs_list_foreach(&node->active_ios, io)
                           if ((io->cmd_tgt && (io->init_task_tag == ox_id)) &&
                               ((rx_id == 0xffff) || (io->tgt_task_tag == rx_id))) {
                                   break;
                           }
           ocs_unlock(&node->active_ios_lock);
           return io;
   }
   
   /**
    * @ingroup io_alloc
    * @brief Return IO context given the instance index.
    *
    * @par Description
    * Returns a pointer to the IO context given by the instance index.
    *
    * @param ocs Pointer to driver structure.
    * @param index IO instance index to return.
    *
    * @return Returns a pointer to the IO context, or NULL if not found.
    */
   ocs_io_t *
   ocs_io_get_instance(ocs_t *ocs, uint32_t index)
   {
           ocs_xport_t *xport = ocs->xport;
           ocs_io_pool_t *io_pool = xport->io_pool;
           return ocs_pool_get_instance(io_pool->pool, index);
   }
   
   /**
    * @brief Generate IO context ddump data.
    *
    * The ddump data for an IO context is generated.
    *
    * @param textbuf Pointer to text buffer.
    * @param io Pointer to IO context.
    *
    * @return None.
    */
   
   void
   ocs_ddump_io(ocs_textbuf_t *textbuf, ocs_io_t *io)
   {
           ocs_ddump_section(textbuf, "io", io->instance_index);
           ocs_ddump_value(textbuf, "display_name", "%s", io->display_name);
           ocs_ddump_value(textbuf, "node_name", "%s", io->node->display_name);
   
           ocs_ddump_value(textbuf, "ref_count", "%d", ocs_ref_read_count(&io->ref));
           ocs_ddump_value(textbuf, "io_type", "%d", io->io_type);
           ocs_ddump_value(textbuf, "hio_type", "%d", io->hio_type);
           ocs_ddump_value(textbuf, "cmd_tgt", "%d", io->cmd_tgt);
           ocs_ddump_value(textbuf, "cmd_ini", "%d", io->cmd_ini);
           ocs_ddump_value(textbuf, "send_abts", "%d", io->send_abts);
           ocs_ddump_value(textbuf, "init_task_tag", "0x%x", io->init_task_tag);
           ocs_ddump_value(textbuf, "tgt_task_tag", "0x%x", io->tgt_task_tag);
           ocs_ddump_value(textbuf, "hw_tag", "0x%x", io->hw_tag);
           ocs_ddump_value(textbuf, "tag", "0x%x", io->tag);
           ocs_ddump_value(textbuf, "timeout", "%d", io->timeout);
           ocs_ddump_value(textbuf, "tmf_cmd", "%d", io->tmf_cmd);
           ocs_ddump_value(textbuf, "abort_rx_id", "0x%x", io->abort_rx_id);
   
           ocs_ddump_value(textbuf, "busy", "%d", ocs_io_busy(io));
           ocs_ddump_value(textbuf, "transferred", "%zu", io->transferred);
           ocs_ddump_value(textbuf, "auto_resp", "%d", io->auto_resp);
           ocs_ddump_value(textbuf, "exp_xfer_len", "%d", io->exp_xfer_len);
           ocs_ddump_value(textbuf, "xfer_req", "%d", io->xfer_req);
           ocs_ddump_value(textbuf, "seq_init", "%d", io->seq_init);
   
           ocs_ddump_value(textbuf, "alloc_link", "%d", ocs_list_on_list(&io->io_alloc_link));
           ocs_ddump_value(textbuf, "pending_link", "%d", ocs_list_on_list(&io->io_pending_link));
           ocs_ddump_value(textbuf, "backend_link", "%d", ocs_list_on_list(&io->link));
   
           if (io->hio) {
                   ocs_ddump_value(textbuf, "hw_tag", "%#x", io->hio->reqtag);
                   ocs_ddump_value(textbuf, "hw_xri", "%#x", io->hio->indicator);
                   ocs_ddump_value(textbuf, "hw_type", "%#x", io->hio->type);
           } else {
                   ocs_ddump_value(textbuf, "hw_tag", "%s", "pending");
                   ocs_ddump_value(textbuf, "hw_xri", "%s", "pending");
                   ocs_ddump_value(textbuf, "hw_type", "%s", "pending");
           }
   
           ocs_scsi_ini_ddump(textbuf, OCS_SCSI_DDUMP_IO, io);
           ocs_scsi_tgt_ddump(textbuf, OCS_SCSI_DDUMP_IO, io);
   
           ocs_ddump_endsection(textbuf, "io", io->instance_index);
   }
   
   void
   ocs_mgmt_io_list(ocs_textbuf_t *textbuf, void *object)
   {
   
           /* Readonly values */
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "display_name");
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "init_task_tag");
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "tag");
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "transferred");
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "auto_resp");
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "exp_xfer_len");
           ocs_mgmt_emit_property_name(textbuf, MGMT_MODE_RD, "xfer_req");
   }
   
   int
   ocs_mgmt_io_get(ocs_textbuf_t *textbuf, char *parent, char *name, void *object)
   {
           char qualifier[80];
           int retval = -1;
           ocs_io_t *io = (ocs_io_t *) object;
   
           snprintf(qualifier, sizeof(qualifier), "%s/io[%d]", parent, io->instance_index);
   
           /* If it doesn't start with my qualifier I don't know what to do with it */
           if (ocs_strncmp(name, qualifier, strlen(qualifier)) == 0) {
                   char *unqualified_name = name + strlen(qualifier) +1;
   
                   /* See if it's a value I can supply */
                   if (ocs_strcmp(unqualified_name, "display_name") == 0) {
                           ocs_mgmt_emit_string(textbuf, MGMT_MODE_RD, "display_name", io->display_name);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "init_task_tag") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "init_task_tag", "0x%x", io->init_task_tag);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "tgt_task_tag") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "tgt_task_tag", "0x%x", io->tgt_task_tag);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "hw_tag") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "hw_tag", "0x%x", io->hw_tag);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "tag") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "tag", "0x%x", io->tag);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "transferred") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "transferred", "%zu", io->transferred);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "auto_resp") == 0) {
                           ocs_mgmt_emit_boolean(textbuf, MGMT_MODE_RD, "auto_resp", io->auto_resp);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "exp_xfer_len") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "exp_xfer_len", "%d", io->exp_xfer_len);
                           retval = 0;
                   } else if (ocs_strcmp(unqualified_name, "xfer_req") == 0) {
                           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "xfer_req", "%d", io->xfer_req);
                           retval = 0;
                   }
           }
   
           return retval;
   }
   
   void
   ocs_mgmt_io_get_all(ocs_textbuf_t *textbuf, void *object)
   {
           ocs_io_t *io = (ocs_io_t *) object;
   
           ocs_mgmt_emit_string(textbuf, MGMT_MODE_RD, "display_name", io->display_name);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "init_task_tag", "0x%x", io->init_task_tag);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "tgt_task_tag", "0x%x", io->tgt_task_tag);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "hw_tag", "0x%x", io->hw_tag);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "tag", "0x%x", io->tag);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "transferred", "%zu", io->transferred);
           ocs_mgmt_emit_boolean(textbuf, MGMT_MODE_RD, "auto_resp", io->auto_resp);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "exp_xfer_len", "%d", io->exp_xfer_len);
           ocs_mgmt_emit_int(textbuf, MGMT_MODE_RD, "xfer_req", "%d", io->xfer_req);
   
   }

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