403 lines
12 KiB
C
403 lines
12 KiB
C
/***********************license start***************
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* Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights
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* reserved.
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*
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of Cavium Networks nor the names of
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* its contributors may be used to endorse or promote products
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* derived from this software without specific prior written
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* permission.
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* This Software, including technical data, may be subject to U.S. export control
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* laws, including the U.S. Export Administration Act and its associated
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* regulations, and may be subject to export or import regulations in other
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* countries.
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* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
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* AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
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* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
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* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION OR
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* DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
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* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
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* MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
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* VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
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* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
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* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
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***********************license end**************************************/
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/**
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* @file
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*
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* Provides APIs for applications to register for hotplug. It also provides
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* APIs for requesting shutdown of a running target application.
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*
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* <hr>$Revision: $<hr>
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*/
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#include "cvmx-app-hotplug.h"
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#include "cvmx-spinlock.h"
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//#define DEBUG 1
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#ifndef CVMX_BUILD_FOR_LINUX_USER
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static CVMX_SHARED cvmx_spinlock_t cvmx_app_hotplug_sync_lock = { CVMX_SPINLOCK_UNLOCKED_VAL };
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static CVMX_SHARED cvmx_spinlock_t cvmx_app_hotplug_lock = { CVMX_SPINLOCK_UNLOCKED_VAL };
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static CVMX_SHARED cvmx_app_hotplug_info_t *cvmx_app_hotplug_info_ptr = NULL;
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static void __cvmx_app_hotplug_shutdown(int irq_number, uint64_t registers[32], void *user_arg);
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static void __cvmx_app_hotplug_sync(void);
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static void __cvmx_app_hotplug_reset(void);
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/**
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* This routine registers an application for hotplug. It installs a handler for
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* any incoming shutdown request. It also registers a callback routine from the
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* application. This callback is invoked when the application receives a
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* shutdown notification.
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*
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* This routine only needs to be called once per application.
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*
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* @param fn Callback routine from the application.
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* @param arg Argument to the application callback routine.
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* @return Return 0 on success, -1 on failure
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*
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*/
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int cvmx_app_hotplug_register(void(*fn)(void*), void* arg)
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{
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/* Find the list of applications launched by bootoct utility. */
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if (!(cvmx_app_hotplug_info_ptr = cvmx_app_hotplug_get_info(cvmx_sysinfo_get()->core_mask)))
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{
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/* Application not launched by bootoct? */
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printf("ERROR: cmvx_app_hotplug_register() failed\n");
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return -1;
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}
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/* Register the callback */
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cvmx_app_hotplug_info_ptr->data = CAST64(arg);
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cvmx_app_hotplug_info_ptr->shutdown_callback = CAST64(fn);
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#ifdef DEBUG
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cvmx_dprintf("cvmx_app_hotplug_register(): coremask 0x%x valid %d\n",
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cvmx_app_hotplug_info_ptr->coremask, cvmx_app_hotplug_info_ptr->valid);
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#endif
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cvmx_interrupt_register(CVMX_IRQ_MBOX0, __cvmx_app_hotplug_shutdown, NULL);
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return 0;
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}
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/**
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* Activate the current application core for receiving hotplug shutdown requests.
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*
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* This routine makes sure that each core belonging to the application is enabled
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* to receive the shutdown notification and also provides a barrier sync to make
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* sure that all cores are ready.
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*/
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int cvmx_app_hotplug_activate(void)
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{
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/* Make sure all application cores are activating */
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__cvmx_app_hotplug_sync();
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cvmx_spinlock_lock(&cvmx_app_hotplug_lock);
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if (!cvmx_app_hotplug_info_ptr)
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{
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cvmx_spinlock_unlock(&cvmx_app_hotplug_lock);
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printf("ERROR: This application is not registered for hotplug\n");
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return -1;
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}
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/* Enable the interrupt before we mark the core as activated */
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cvmx_interrupt_unmask_irq(CVMX_IRQ_MBOX0);
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cvmx_app_hotplug_info_ptr->hotplug_activated_coremask |= (1<<cvmx_get_core_num());
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#ifdef DEBUG
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cvmx_dprintf("cvmx_app_hotplug_activate(): coremask 0x%x valid %d sizeof %d\n",
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cvmx_app_hotplug_info_ptr->coremask, cvmx_app_hotplug_info_ptr->valid,
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sizeof(*cvmx_app_hotplug_info_ptr));
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#endif
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cvmx_spinlock_unlock(&cvmx_app_hotplug_lock);
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return 0;
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}
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/**
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* This routine is only required if cvmx_app_hotplug_shutdown_request() was called
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* with wait=0. This routine waits for the application shutdown to complete.
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*
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* @param coremask Coremask the application is running on.
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* @return 0 on success, -1 on error
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*
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*/
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int cvmx_app_hotplug_shutdown_complete(uint32_t coremask)
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{
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cvmx_app_hotplug_info_t *hotplug_info_ptr;
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if (!(hotplug_info_ptr = cvmx_app_hotplug_get_info(coremask)))
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{
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printf("\nERROR: Failed to get hotplug info for coremask: 0x%x\n", (unsigned int)coremask);
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return -1;
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}
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while(!hotplug_info_ptr->shutdown_done);
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/* Clean up the hotplug info region for this app */
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bzero(hotplug_info_ptr, sizeof(*hotplug_info_ptr));
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return 0;
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}
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/**
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* Disable recognition of any incoming shutdown request.
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*/
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void cvmx_app_hotplug_shutdown_disable(void)
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{
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cvmx_interrupt_mask_irq(CVMX_IRQ_MBOX0);
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}
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/**
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* Re-enable recognition of incoming shutdown requests.
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*/
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void cvmx_app_hotplug_shutdown_enable(void)
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{
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cvmx_interrupt_unmask_irq(CVMX_IRQ_MBOX0);
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}
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/*
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* ISR for the incoming shutdown request interrupt.
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*/
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static void __cvmx_app_hotplug_shutdown(int irq_number, uint64_t registers[32], void *user_arg)
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{
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cvmx_sysinfo_t *sys_info_ptr = cvmx_sysinfo_get();
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uint32_t flags;
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cvmx_interrupt_mask_irq(CVMX_IRQ_MBOX0);
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/* Clear the interrupt */
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cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 1);
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/* Make sure the write above completes */
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cvmx_read_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()));
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if (!cvmx_app_hotplug_info_ptr)
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{
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printf("ERROR: Application is not registered for hotplug!\n");
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return;
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}
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if (cvmx_app_hotplug_info_ptr->hotplug_activated_coremask != sys_info_ptr->core_mask)
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{
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printf("ERROR: Shutdown requested when not all app cores have activated hotplug\n"
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"Application coremask: 0x%x Hotplug coremask: 0x%x\n", (unsigned int)sys_info_ptr->core_mask,
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(unsigned int)cvmx_app_hotplug_info_ptr->hotplug_activated_coremask);
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return;
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}
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/* Call the application's own callback function */
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((void(*)(void*))(long)cvmx_app_hotplug_info_ptr->shutdown_callback)(CASTPTR(void *, cvmx_app_hotplug_info_ptr->data));
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__cvmx_app_hotplug_sync();
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if (cvmx_coremask_first_core(sys_info_ptr->core_mask))
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{
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bzero(cvmx_app_hotplug_info_ptr, sizeof(*cvmx_app_hotplug_info_ptr));
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#ifdef DEBUG
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cvmx_dprintf("__cvmx_app_hotplug_shutdown(): setting shutdown done! \n");
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#endif
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cvmx_app_hotplug_info_ptr->shutdown_done = 1;
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}
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flags = cvmx_interrupt_disable_save();
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__cvmx_app_hotplug_sync();
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/* Reset the core */
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__cvmx_app_hotplug_reset();
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}
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/*
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* Reset the core. We just jump back to the reset vector for now.
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*/
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void __cvmx_app_hotplug_reset(void)
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{
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/* Code from SecondaryCoreLoop from bootloader, sleep until we recieve
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a NMI. */
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__asm__ volatile (
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".set noreorder \n"
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"\tsync \n"
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"\tnop \n"
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"1:\twait \n"
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"\tb 1b \n"
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"\tnop \n"
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".set reorder \n"
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::
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);
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}
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/*
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* We need a separate sync operation from cvmx_coremask_barrier_sync() to
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* avoid a deadlock on state.lock, since the application itself maybe doing a
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* cvmx_coremask_barrier_sync().
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*/
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static void __cvmx_app_hotplug_sync(void)
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{
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static CVMX_SHARED volatile uint32_t sync_coremask = 0;
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cvmx_sysinfo_t *sys_info_ptr = cvmx_sysinfo_get();
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cvmx_spinlock_lock(&cvmx_app_hotplug_sync_lock);
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sync_coremask |= cvmx_coremask_core(cvmx_get_core_num());
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cvmx_spinlock_unlock(&cvmx_app_hotplug_sync_lock);
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while (sync_coremask != sys_info_ptr->core_mask);
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}
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#endif /* CVMX_BUILD_FOR_LINUX_USER */
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/**
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* Return the hotplug info structure (cvmx_app_hotplug_info_t) pointer for the
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* application running on the given coremask.
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*
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* @param coremask Coremask of application.
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* @return Returns hotplug info struct on success, NULL on failure
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*
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*/
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cvmx_app_hotplug_info_t* cvmx_app_hotplug_get_info(uint32_t coremask)
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{
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const struct cvmx_bootmem_named_block_desc *block_desc;
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cvmx_app_hotplug_info_t *hip;
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cvmx_app_hotplug_global_t *hgp;
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int i;
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block_desc = cvmx_bootmem_find_named_block(CVMX_APP_HOTPLUG_INFO_REGION_NAME);
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if (!block_desc)
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{
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printf("ERROR: Hotplug info region is not setup\n");
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return NULL;
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}
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else
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#ifdef CVMX_BUILD_FOR_LINUX_USER
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{
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size_t pg_sz = sysconf(_SC_PAGESIZE), size;
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off_t offset;
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char *vaddr;
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int fd;
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if ((fd = open("/dev/mem", O_RDWR)) == -1) {
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perror("open");
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return NULL;
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}
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/*
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* We need to mmap() this memory, since this was allocated from the
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* kernel bootup code and does not reside in the RESERVE32 region.
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*/
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size = CVMX_APP_HOTPLUG_INFO_REGION_SIZE + pg_sz-1;
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offset = block_desc->base_addr & ~(pg_sz-1);
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if ((vaddr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset)) == MAP_FAILED)
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{
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perror("mmap");
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return NULL;
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}
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hgp = (cvmx_app_hotplug_global_t *)(vaddr + ( block_desc->base_addr & (pg_sz-1)));
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}
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#else
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hgp = cvmx_phys_to_ptr(block_desc->base_addr);
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#endif
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hip = hgp->hotplug_info_array;
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#ifdef DEBUG
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cvmx_dprintf("cvmx_app_hotplug_get_info(): hotplug_info phy addr 0x%llx ptr %p\n",
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block_desc->base_addr, hgp);
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#endif
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/* Look for the current app's info */
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for (i=0; i<CVMX_APP_HOTPLUG_MAX_APPS; i++)
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{
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if (hip[i].coremask == coremask)
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{
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#ifdef DEBUG
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cvmx_dprintf("cvmx_app_hotplug_get_info(): coremask match %d -- coremask 0x%x valid %d\n",
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i, hip[i].coremask, hip[i].valid);
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#endif
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return &hip[i];
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}
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}
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return NULL;
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}
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/**
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* This routine sends a shutdown request to a running target application.
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*
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* @param coremask Coremask the application is running on.
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* @param wait 1 - Wait for shutdown completion
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* 0 - Do not wait
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* @return 0 on success, -1 on error
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*
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*/
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int cvmx_app_hotplug_shutdown_request(uint32_t coremask, int wait)
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{
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int i;
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cvmx_app_hotplug_info_t *hotplug_info_ptr;
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if (!(hotplug_info_ptr = cvmx_app_hotplug_get_info(coremask)))
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{
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printf("\nERROR: Failed to get hotplug info for coremask: 0x%x\n", (unsigned int)coremask);
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return -1;
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}
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if (!hotplug_info_ptr->shutdown_callback)
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{
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printf("\nERROR: Target application has not registered for hotplug!\n");
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return -1;
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}
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if (hotplug_info_ptr->hotplug_activated_coremask != coremask)
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{
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printf("\nERROR: Not all application cores have activated hotplug\n");
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return -1;
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}
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/* Send IPIs to all application cores to request shutdown */
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for (i=0; i<CVMX_MAX_CORES; i++) {
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if (coremask & (1<<i))
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cvmx_write_csr(CVMX_CIU_MBOX_SETX(i), 1);
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}
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if (wait)
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{
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while (!hotplug_info_ptr->shutdown_done);
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/* Clean up the hotplug info region for this application */
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bzero(hotplug_info_ptr, sizeof(*hotplug_info_ptr));
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}
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return 0;
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}
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