FreeBSD/Linux Kernel Cross Reference
sys/dev/isci/isci.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * BSD LICENSE
      *
      * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *   * 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.
     *
     * 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
     * OWNER 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <dev/isci/isci.h>
    
    #include <sys/sysctl.h>
    #include <sys/malloc.h>
    
    #include <cam/cam_periph.h>
    
    #include <dev/led/led.h>
    
    #include <dev/pci/pcireg.h>
    #include <dev/pci/pcivar.h>
    
    #include <dev/isci/scil/scic_logger.h>
    #include <dev/isci/scil/scic_library.h>
    #include <dev/isci/scil/scic_sgpio.h>
    #include <dev/isci/scil/scic_user_callback.h>
    
    #include <dev/isci/scil/scif_controller.h>
    #include <dev/isci/scil/scif_library.h>
    #include <dev/isci/scil/scif_logger.h>
    #include <dev/isci/scil/scif_user_callback.h>
    
    MALLOC_DEFINE(M_ISCI, "isci", "isci driver memory allocations");
    
    struct isci_softc *g_isci;
    uint32_t g_isci_debug_level = 0;
    
    static int isci_probe(device_t);
    static int isci_attach(device_t);
    static int isci_detach(device_t);
    
    int isci_initialize(struct isci_softc *isci);
    
    void isci_allocate_dma_buffer_callback(void *arg, bus_dma_segment_t *seg,
        int nseg, int error);
    
    static device_method_t isci_pci_methods[] = {
             /* Device interface */
             DEVMETHOD(device_probe,  isci_probe),
             DEVMETHOD(device_attach, isci_attach),
             DEVMETHOD(device_detach, isci_detach),
             { 0, 0 }
    };
    
    static driver_t isci_pci_driver = {
             "isci",
             isci_pci_methods,
             sizeof(struct isci_softc),
    };
    
    DRIVER_MODULE(isci, pci, isci_pci_driver, 0, 0);
    MODULE_DEPEND(isci, cam, 1, 1, 1);
    
    static struct _pcsid
    {
             u_int32_t      type;
             const char     *desc;
    } pci_ids[] = {
             { 0x1d608086,  "Intel(R) C600 Series Chipset SAS Controller"  },
             { 0x1d618086,  "Intel(R) C600 Series Chipset SAS Controller (SATA mode)"  },
             { 0x1d628086,  "Intel(R) C600 Series Chipset SAS Controller"  },
             { 0x1d638086,  "Intel(R) C600 Series Chipset SAS Controller"  },
             { 0x1d648086,  "Intel(R) C600 Series Chipset SAS Controller"  },
             { 0x1d658086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d668086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d678086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d688086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d698086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d6a8086,  "Intel(R) C600 Series Chipset SAS Controller (SATA mode)"  },
            { 0x1d6b8086,  "Intel(R) C600 Series Chipset SAS Controller (SATA mode)"  },
            { 0x1d6c8086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d6d8086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d6e8086,  "Intel(R) C600 Series Chipset SAS Controller"  },
            { 0x1d6f8086,  "Intel(R) C600 Series Chipset SAS Controller (SATA mode)"  },
            { 0x00000000,  NULL                            }
   };
   
   static int
   isci_probe (device_t device)
   {
           u_int32_t       type = pci_get_devid(device);
           struct _pcsid   *ep = pci_ids;
   
           while (ep->type && ep->type != type)
                   ++ep;
   
           if (ep->desc)
           {
                   device_set_desc(device, ep->desc);
                   return (BUS_PROBE_DEFAULT);
           }
           else
                   return (ENXIO);
   }
   
   static int
   isci_allocate_pci_memory(struct isci_softc *isci)
   {
           int i;
   
           for (i = 0; i < ISCI_NUM_PCI_BARS; i++)
           {
                   struct ISCI_PCI_BAR *pci_bar = &isci->pci_bar[i];
   
                   pci_bar->resource_id = PCIR_BAR(i*2);
                   pci_bar->resource = bus_alloc_resource_any(isci->device,
                       SYS_RES_MEMORY, &pci_bar->resource_id,
                       RF_ACTIVE);
   
                   if(pci_bar->resource == NULL)
                           isci_log_message(0, "ISCI",
                               "unable to allocate pci resource\n");
                   else {
                           pci_bar->bus_tag = rman_get_bustag(pci_bar->resource);
                           pci_bar->bus_handle =
                               rman_get_bushandle(pci_bar->resource);
                   }
           }
   
           return (0);
   }
   
   static int
   isci_attach(device_t device)
   {
           int error;
           struct isci_softc *isci = DEVICE2SOFTC(device);
   
           g_isci = isci;
           isci->device = device;
           pci_enable_busmaster(device);
   
           isci_allocate_pci_memory(isci);
   
           error = isci_initialize(isci);
   
           if (error)
           {
                   isci_detach(device);
                   return (error);
           }
   
           isci_interrupt_setup(isci);
           isci_sysctl_initialize(isci);
   
           return (0);
   }
   
   static int
   isci_detach(device_t device)
   {
           struct isci_softc *isci = DEVICE2SOFTC(device);
           int i, phy;
   
           for (i = 0; i < isci->controller_count; i++) {
                   struct ISCI_CONTROLLER *controller = &isci->controllers[i];
                   SCI_STATUS status;
                   void *unmap_buffer;
   
                   if (controller->scif_controller_handle != NULL) {
                           scic_controller_disable_interrupts(
                               scif_controller_get_scic_handle(controller->scif_controller_handle));
   
                           mtx_lock(&controller->lock);
                           status = scif_controller_stop(controller->scif_controller_handle, 0);
                           mtx_unlock(&controller->lock);
   
                           while (controller->is_started == TRUE) {
                                   /* Now poll for interrupts until the controller stop complete
                                    *  callback is received.
                                    */
                                   mtx_lock(&controller->lock);
                                   isci_interrupt_poll_handler(controller);
                                   mtx_unlock(&controller->lock);
                                   pause("isci", 1);
                           }
   
                           if(controller->sim != NULL) {
                                   mtx_lock(&controller->lock);
                                   xpt_free_path(controller->path);
                                   xpt_bus_deregister(cam_sim_path(controller->sim));
                                   cam_sim_free(controller->sim, TRUE);
                                   mtx_unlock(&controller->lock);
                           }
                   }
   
                   if (controller->timer_memory != NULL)
                           free(controller->timer_memory, M_ISCI);
   
                   if (controller->remote_device_memory != NULL)
                           free(controller->remote_device_memory, M_ISCI);
   
                   for (phy = 0; phy < SCI_MAX_PHYS; phy++) {
                           if (controller->phys[phy].cdev_fault)
                                   led_destroy(controller->phys[phy].cdev_fault);
   
                           if (controller->phys[phy].cdev_locate)
                                   led_destroy(controller->phys[phy].cdev_locate);
                   }
   
                   while (1) {
                           sci_pool_get(controller->unmap_buffer_pool, unmap_buffer);
                           if (unmap_buffer == NULL)
                                   break;
                           contigfree(unmap_buffer, PAGE_SIZE, M_ISCI);
                   }
           }
   
           /* The SCIF controllers have been stopped, so we can now
            *  free the SCI library memory.
            */
           if (isci->sci_library_memory != NULL)
                   free(isci->sci_library_memory, M_ISCI);
   
           for (i = 0; i < ISCI_NUM_PCI_BARS; i++)
           {
                   struct ISCI_PCI_BAR *pci_bar = &isci->pci_bar[i];
   
                   if (pci_bar->resource != NULL)
                           bus_release_resource(device, SYS_RES_MEMORY,
                               pci_bar->resource_id, pci_bar->resource);
           }
   
           for (i = 0; i < isci->num_interrupts; i++)
           {
                   struct ISCI_INTERRUPT_INFO *interrupt_info;
   
                   interrupt_info = &isci->interrupt_info[i];
   
                   if(interrupt_info->tag != NULL)
                           bus_teardown_intr(device, interrupt_info->res,
                               interrupt_info->tag);
   
                   if(interrupt_info->res != NULL)
                           bus_release_resource(device, SYS_RES_IRQ,
                               rman_get_rid(interrupt_info->res),
                               interrupt_info->res);
   
                   pci_release_msi(device);
           }
           pci_disable_busmaster(device);
   
           return (0);
   }
   
   int
   isci_initialize(struct isci_softc *isci)
   {
           int error;
           uint32_t status = 0;
           uint32_t library_object_size;
           uint32_t verbosity_mask;
           uint32_t scic_log_object_mask;
           uint32_t scif_log_object_mask;
           uint8_t *header_buffer;
   
           library_object_size = scif_library_get_object_size(SCI_MAX_CONTROLLERS);
   
           isci->sci_library_memory =
               malloc(library_object_size, M_ISCI, M_NOWAIT | M_ZERO );
   
           isci->sci_library_handle = scif_library_construct(
               isci->sci_library_memory, SCI_MAX_CONTROLLERS);
   
           sci_object_set_association( isci->sci_library_handle, (void *)isci);
   
           verbosity_mask = (1<<SCI_LOG_VERBOSITY_ERROR) |
               (1<<SCI_LOG_VERBOSITY_WARNING) | (1<<SCI_LOG_VERBOSITY_INFO) |
               (1<<SCI_LOG_VERBOSITY_TRACE);
   
           scic_log_object_mask = 0xFFFFFFFF;
           scic_log_object_mask &= ~SCIC_LOG_OBJECT_COMPLETION_QUEUE;
           scic_log_object_mask &= ~SCIC_LOG_OBJECT_SSP_IO_REQUEST;
           scic_log_object_mask &= ~SCIC_LOG_OBJECT_STP_IO_REQUEST;
           scic_log_object_mask &= ~SCIC_LOG_OBJECT_SMP_IO_REQUEST;
           scic_log_object_mask &= ~SCIC_LOG_OBJECT_CONTROLLER;
   
           scif_log_object_mask = 0xFFFFFFFF;
           scif_log_object_mask &= ~SCIF_LOG_OBJECT_CONTROLLER;
           scif_log_object_mask &= ~SCIF_LOG_OBJECT_IO_REQUEST;
   
           TUNABLE_INT_FETCH("hw.isci.debug_level", &g_isci_debug_level);
   
           sci_logger_enable(sci_object_get_logger(isci->sci_library_handle),
               scif_log_object_mask, verbosity_mask);
   
           sci_logger_enable(sci_object_get_logger(
               scif_library_get_scic_handle(isci->sci_library_handle)),
               scic_log_object_mask, verbosity_mask);
   
           header_buffer = (uint8_t *)&isci->pci_common_header;
           for (uint8_t i = 0; i < sizeof(isci->pci_common_header); i++)
                   header_buffer[i] = pci_read_config(isci->device, i, 1);
   
           scic_library_set_pci_info(
               scif_library_get_scic_handle(isci->sci_library_handle),
               &isci->pci_common_header);
   
           isci->oem_parameters_found = FALSE;
   
           isci_get_oem_parameters(isci);
   
           /* trigger interrupt if 32 completions occur before timeout expires */
           isci->coalesce_number = 32;
   
           /* trigger interrupt if 2 microseconds elapse after a completion occurs,
            *  regardless if "coalesce_number" completions have occurred
            */
           isci->coalesce_timeout = 2;
   
           isci->controller_count = scic_library_get_pci_device_controller_count(
               scif_library_get_scic_handle(isci->sci_library_handle));
   
           for (int index = 0; index < isci->controller_count; index++) {
                   struct ISCI_CONTROLLER *controller = &isci->controllers[index];
                   SCI_CONTROLLER_HANDLE_T scif_controller_handle;
   
                   controller->index = index;
                   isci_controller_construct(controller, isci);
   
                   scif_controller_handle = controller->scif_controller_handle;
   
                   status = isci_controller_initialize(controller);
   
                   if(status != SCI_SUCCESS) {
                           isci_log_message(0, "ISCI",
                               "isci_controller_initialize FAILED: %x\n",
                               status);
                           return (status);
                   }
   
                   error = isci_controller_allocate_memory(controller);
   
                   if (error != 0)
                           return (error);
   
                   scif_controller_set_interrupt_coalescence(
                       scif_controller_handle, isci->coalesce_number,
                       isci->coalesce_timeout);
           }
   
           /* FreeBSD provides us a hook to ensure we get a chance to start
            *  our controllers and complete initial domain discovery before
            *  it searches for the boot device.  Once we're done, we'll
            *  disestablish the hook, signaling the kernel that is can proceed
            *  with the boot process.
            */
           isci->config_hook.ich_func = &isci_controller_start;
           isci->config_hook.ich_arg = &isci->controllers[0];
   
           if (config_intrhook_establish(&isci->config_hook) != 0)
                   isci_log_message(0, "ISCI",
                       "config_intrhook_establish failed!\n");
   
           return (status);
   }
   
   void
   isci_allocate_dma_buffer_callback(void *arg, bus_dma_segment_t *seg,
       int nseg, int error)
   {
           struct ISCI_MEMORY *memory = (struct ISCI_MEMORY *)arg;
   
           memory->error = error;
   
           if (nseg != 1 || error != 0)
                   isci_log_message(0, "ISCI",
                       "Failed to allocate physically contiguous memory!\n");
           else
                   memory->physical_address = seg->ds_addr;
   }
   
   int
   isci_allocate_dma_buffer(device_t device, struct ISCI_CONTROLLER *controller,
       struct ISCI_MEMORY *memory)
   {
           uint32_t status;
   
           status = bus_dma_tag_create(bus_get_dma_tag(device),
               0x40 /* cacheline alignment */,
               ISCI_DMA_BOUNDARY, BUS_SPACE_MAXADDR,
               BUS_SPACE_MAXADDR, NULL, NULL, memory->size,
               0x1 /* we want physically contiguous */,
               memory->size, 0, busdma_lock_mutex, &controller->lock,
               &memory->dma_tag);
   
           if(status == ENOMEM) {
                   isci_log_message(0, "ISCI", "bus_dma_tag_create failed\n");
                   return (status);
           }
   
           status = bus_dmamem_alloc(memory->dma_tag,
               (void **)&memory->virtual_address, BUS_DMA_ZERO, &memory->dma_map);
   
           if(status == ENOMEM)
           {
                   isci_log_message(0, "ISCI", "bus_dmamem_alloc failed\n");
                   return (status);
           }
   
           status = bus_dmamap_load(memory->dma_tag, memory->dma_map,
               (void *)memory->virtual_address, memory->size,
               isci_allocate_dma_buffer_callback, memory, 0);
   
           if(status == EINVAL)
           {
                   isci_log_message(0, "ISCI", "bus_dmamap_load failed\n");
                   return (status);
           }
   
           return (0);
   }
   
   /**
    * @brief This callback method asks the user to associate the supplied
    *        lock with an operating environment specific locking construct.
    *
    * @param[in]  controller This parameter specifies the controller with
    *             which this lock is to be associated.
    * @param[in]  lock This parameter specifies the lock for which the
    *             user should associate an operating environment specific
    *             locking object.
    *
    * @see The SCI_LOCK_LEVEL enumeration for more information.
    *
    * @return none.
    */
   void
   scif_cb_lock_associate(SCI_CONTROLLER_HANDLE_T controller,
       SCI_LOCK_HANDLE_T lock)
   {
   
   }
   
   /**
    * @brief This callback method asks the user to de-associate the supplied
    *        lock with an operating environment specific locking construct.
    *
    * @param[in]  controller This parameter specifies the controller with
    *             which this lock is to be de-associated.
    * @param[in]  lock This parameter specifies the lock for which the
    *             user should de-associate an operating environment specific
    *             locking object.
    *
    * @see The SCI_LOCK_LEVEL enumeration for more information.
    *
    * @return none.
    */
   void
   scif_cb_lock_disassociate(SCI_CONTROLLER_HANDLE_T controller,
       SCI_LOCK_HANDLE_T lock)
   {
   
   }
   
   
   /**
    * @brief This callback method asks the user to acquire/get the lock.
    *        This method should pend until the lock has been acquired.
    *
    * @param[in]  controller This parameter specifies the controller with
    *             which this lock is associated.
    * @param[in]  lock This parameter specifies the lock to be acquired.
    *
    * @return none
    */
   void
   scif_cb_lock_acquire(SCI_CONTROLLER_HANDLE_T controller,
       SCI_LOCK_HANDLE_T lock)
   {
   
   }
   
   /**
    * @brief This callback method asks the user to release a lock.
    *
    * @param[in]  controller This parameter specifies the controller with
    *             which this lock is associated.
    * @param[in]  lock This parameter specifies the lock to be released.
    *
    * @return none
    */
   void
   scif_cb_lock_release(SCI_CONTROLLER_HANDLE_T controller,
       SCI_LOCK_HANDLE_T lock)
   {
   }
   
   /**
    * @brief This callback method creates an OS specific deferred task
    *        for internal usage. The handler to deferred task is stored by OS
    *        driver.
    *
    * @param[in] controller This parameter specifies the controller object
    *            with which this callback is associated.
    *
    * @return none
    */
   void
   scif_cb_start_internal_io_task_create(SCI_CONTROLLER_HANDLE_T controller)
   {
   
   }
   
   /**
    * @brief This callback method schedules a OS specific deferred task.
    *
    * @param[in] controller This parameter specifies the controller
    *            object with which this callback is associated.
    * @param[in] start_internal_io_task_routine This parameter specifies the
    *            sci start_internal_io routine.
    * @param[in] context This parameter specifies a handle to a parameter
    *            that will be passed into the "start_internal_io_task_routine"
    *            when it is invoked.
    *
    * @return none
    */
   void
   scif_cb_start_internal_io_task_schedule(SCI_CONTROLLER_HANDLE_T scif_controller,
       FUNCPTR start_internal_io_task_routine, void *context)
   {
           /** @todo Use FreeBSD tasklet to defer this routine to a later time,
            *  rather than calling the routine inline.
            */
           SCI_START_INTERNAL_IO_ROUTINE sci_start_internal_io_routine =
               (SCI_START_INTERNAL_IO_ROUTINE)start_internal_io_task_routine;
   
           sci_start_internal_io_routine(context);
   }
   
   /**
    * @brief In this method the user must write to PCI memory via access.
    *        This method is used for access to memory space and IO space.
    *
    * @param[in]  controller The controller for which to read a DWORD.
    * @param[in]  address This parameter depicts the address into
    *             which to write.
    * @param[out] write_value This parameter depicts the value being written
    *             into the PCI memory location.
    *
    * @todo These PCI memory access calls likely needs to be optimized into macros?
    */
   void
   scic_cb_pci_write_dword(SCI_CONTROLLER_HANDLE_T scic_controller,
       void *address, uint32_t write_value)
   {
           SCI_CONTROLLER_HANDLE_T scif_controller =
               (SCI_CONTROLLER_HANDLE_T) sci_object_get_association(scic_controller);
           struct ISCI_CONTROLLER *isci_controller =
               (struct ISCI_CONTROLLER *) sci_object_get_association(scif_controller);
           struct isci_softc *isci = isci_controller->isci;
           uint32_t bar = (uint32_t)(((POINTER_UINT)address & 0xF0000000) >> 28);
           bus_size_t offset = (bus_size_t)((POINTER_UINT)address & 0x0FFFFFFF);
   
           bus_space_write_4(isci->pci_bar[bar].bus_tag,
               isci->pci_bar[bar].bus_handle, offset, write_value);
   }
   
   /**
    * @brief In this method the user must read from PCI memory via access.
    *        This method is used for access to memory space and IO space.
    *
    * @param[in]  controller The controller for which to read a DWORD.
    * @param[in]  address This parameter depicts the address from
    *             which to read.
    *
    * @return The value being returned from the PCI memory location.
    *
    * @todo This PCI memory access calls likely need to be optimized into macro?
    */
   uint32_t
   scic_cb_pci_read_dword(SCI_CONTROLLER_HANDLE_T scic_controller, void *address)
   {
           SCI_CONTROLLER_HANDLE_T scif_controller =
                   (SCI_CONTROLLER_HANDLE_T)sci_object_get_association(scic_controller);
           struct ISCI_CONTROLLER *isci_controller =
                   (struct ISCI_CONTROLLER *)sci_object_get_association(scif_controller);
           struct isci_softc *isci = isci_controller->isci;
           uint32_t bar = (uint32_t)(((POINTER_UINT)address & 0xF0000000) >> 28);
           bus_size_t offset = (bus_size_t)((POINTER_UINT)address & 0x0FFFFFFF);
   
           return (bus_space_read_4(isci->pci_bar[bar].bus_tag,
               isci->pci_bar[bar].bus_handle, offset));
   }
   
   /**
    * @brief This method is called when the core requires the OS driver
    *        to stall execution.  This method is utilized during initialization
    *        or non-performance paths only.
    *
    * @param[in]  microseconds This parameter specifies the number of
    *             microseconds for which to stall.  The operating system driver
    *             is allowed to round this value up where necessary.
    *
    * @return none.
    */
   void
   scic_cb_stall_execution(uint32_t microseconds)
   {
   
           DELAY(microseconds);
   }
   
   /**
    * @brief In this method the user must return the base address register (BAR)
    *        value for the supplied base address register number.
    *
    * @param[in] controller The controller for which to retrieve the bar number.
    * @param[in] bar_number This parameter depicts the BAR index/number to be read.
    *
    * @return Return a pointer value indicating the contents of the BAR.
    * @retval NULL indicates an invalid BAR index/number was specified.
    * @retval All other values indicate a valid VIRTUAL address from the BAR.
    */
   void *
   scic_cb_pci_get_bar(SCI_CONTROLLER_HANDLE_T controller,
       uint16_t bar_number)
   {
   
           return ((void *)(POINTER_UINT)((uint32_t)bar_number << 28));
   }
   
   /**
    * @brief This method informs the SCI Core user that a phy/link became
    *        ready, but the phy is not allowed in the port.  In some
    *        situations the underlying hardware only allows for certain phy
    *        to port mappings.  If these mappings are violated, then this
    *        API is invoked.
    *
    * @param[in] controller This parameter represents the controller which
    *            contains the port.
    * @param[in] port This parameter specifies the SCI port object for which
    *            the callback is being invoked.
    * @param[in] phy This parameter specifies the phy that came ready, but the
    *            phy can't be a valid member of the port.
    *
    * @return none
    */
   void
   scic_cb_port_invalid_link_up(SCI_CONTROLLER_HANDLE_T controller,
       SCI_PORT_HANDLE_T port, SCI_PHY_HANDLE_T phy)
   {
   
   }

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