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