plat/fvp/plat_topology.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2013-2014, ARM Limited and Contributors. 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 ARM 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.
  */

 #include <string.h>
 #include <assert.h>
 #include <platform.h>
 #include <fvp_pwrc.h>
 /* TODO: Reusing psci error codes & state information. Get our own! */
 #include <psci.h>

 /* We treat '255' as an invalid affinity instance */
 #define AFFINST_INVAL	0xff

 /*******************************************************************************
  * We support 3 flavours of the FVP: Foundation, Base AEM & Base Cortex. Each
  * flavour has a different topology. The common bit is that there can be a max.
  * of 2 clusters (affinity 1) and 4 cpus (affinity 0) per cluster. So we define
  * a tree like data structure which caters to these maximum bounds. It simply
  * marks the absent affinity level instances as PSCI_AFF_ABSENT e.g. there is no
  * cluster 1 on the Foundation FVP. The 'data' field is currently unused.
  ******************************************************************************/
 typedef struct {
 	unsigned char sibling;
 	unsigned char child;
 	unsigned char state;
 	unsigned int data;
 } affinity_info;

 /*******************************************************************************
  * The following two data structures store the topology tree for the fvp. There
  * is a separate array for each affinity level i.e. cpus and clusters. The child
  * and sibling references allow traversal inside and in between the two arrays.
  ******************************************************************************/
 static affinity_info fvp_aff1_topology_map[PLATFORM_CLUSTER_COUNT];
 static affinity_info fvp_aff0_topology_map[PLATFORM_CORE_COUNT];

 /* Simple global variable to safeguard us from stupidity */
 static unsigned int topology_setup_done;

 /*******************************************************************************
  * This function implements a part of the critical interface between the psci
  * generic layer and the platform to allow the former to detect the platform
  * topology. psci queries the platform to determine how many affinity instances
  * are present at a particular level for a given mpidr e.g. consider a dual
  * cluster platform where each cluster has 4 cpus. A call to this function with
  * (0, 0x100) will return the number of cpus implemented under cluster 1 i.e. 4.
  * Similarly a call with (1, 0x100) will return 2 i.e. the number of clusters.
  * This is 'cause we are effectively asking how many affinity level 1 instances
  * are implemented under affinity level 2 instance 0.
  ******************************************************************************/
 unsigned int plat_get_aff_count(unsigned int aff_lvl,
 				unsigned long mpidr)
 {
 	unsigned int aff_count = 1, ctr;
 	unsigned char parent_aff_id;

 	assert(topology_setup_done == 1);

 	switch (aff_lvl) {
 	case 3:
 	case 2:
 		/*
 		 * Assert if the parent affinity instance is not 0.
 		 * This also takes care of level 3 in an obfuscated way
 		 */
 		parent_aff_id = (mpidr >> MPIDR_AFF3_SHIFT) & MPIDR_AFFLVL_MASK;
 		assert(parent_aff_id == 0);

 		/*
 		 * Report that we implement a single instance of
 		 * affinity levels 2 & 3 which are AFF_ABSENT
 		 */
 		break;
 	case 1:
 		/* Assert if the parent affinity instance is not 0. */
 		parent_aff_id = (mpidr >> MPIDR_AFF2_SHIFT) & MPIDR_AFFLVL_MASK;
 		assert(parent_aff_id == 0);

 		/* Fetch the starting index in the aff1 array */
 		for (ctr = 0;
 		     fvp_aff1_topology_map[ctr].sibling != AFFINST_INVAL;
 		     ctr = fvp_aff1_topology_map[ctr].sibling) {
 			aff_count++;
 		}

 		break;
 	case 0:
 		/* Assert if the cluster id is anything apart from 0 or 1 */
 		parent_aff_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
 		assert(parent_aff_id < PLATFORM_CLUSTER_COUNT);

 		/* Fetch the starting index in the aff0 array */
 		for (ctr = fvp_aff1_topology_map[parent_aff_id].child;
 		     fvp_aff0_topology_map[ctr].sibling != AFFINST_INVAL;
 		     ctr = fvp_aff0_topology_map[ctr].sibling) {
 			aff_count++;
 		}

 		break;
 	default:
 		assert(0);
 	}

 	return aff_count;
 }

 /*******************************************************************************
  * This function implements a part of the critical interface between the psci
  * generic layer and the platform to allow the former to detect the state of a
  * affinity instance in the platform topology. psci queries the platform to
  * determine whether an affinity instance is present or absent. This caters for
  * topologies where an intermediate affinity level instance is missing e.g.
  * consider a platform which implements a single cluster with 4 cpus and there
  * is another cpu sitting directly on the interconnect along with the cluster.
  * The mpidrs of the cluster would range from 0x0-0x3. The mpidr of the single
  * cpu would be 0x100 to highlight that it does not belong to cluster 0. Cluster
  * 1 is however missing but needs to be accounted to reach this single cpu in
  * the topology tree. Hence it will be marked as PSCI_AFF_ABSENT. This is not
  * applicable to the FVP but depicted as an example.
  ******************************************************************************/
 unsigned int plat_get_aff_state(unsigned int aff_lvl,
 				unsigned long mpidr)
 {
 	unsigned int aff_state = PSCI_AFF_ABSENT, idx;
 	idx = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;

 	assert(topology_setup_done == 1);

 	switch (aff_lvl) {
 	case 3:
 	case 2:
 		/* Report affinity levels 2 & 3 as absent */
 		break;
 	case 1:
 		aff_state = fvp_aff1_topology_map[idx].state;
 		break;
 	case 0:
 		/*
 		 * First get start index of the aff0 in its array & then add
 		 * to it the affinity id that we want the state of
 		 */
 		idx = fvp_aff1_topology_map[idx].child;
 		idx += (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
 		aff_state = fvp_aff0_topology_map[idx].state;
 		break;
 	default:
 		assert(0);
 	}

 	return aff_state;
 }

 /*******************************************************************************
  * Handy optimization to prevent the psci implementation from traversing through
  * affinity levels which are not present while detecting the platform topology.
  ******************************************************************************/
 int plat_get_max_afflvl()
 {
 	return MPIDR_AFFLVL1;
 }

 /*******************************************************************************
  * This function populates the FVP specific topology information depending upon
  * the FVP flavour its running on. We construct all the mpidrs we can handle
  * and rely on the PWRC.PSYSR to flag absent cpus when their status is queried.
  ******************************************************************************/
 int plat_setup_topology()
 {
 	unsigned char aff0, aff1, aff_state, aff0_offset = 0;
 	unsigned long mpidr;

 	topology_setup_done = 0;

 	for (aff1 = 0; aff1 < PLATFORM_CLUSTER_COUNT; aff1++) {

 		fvp_aff1_topology_map[aff1].child = aff0_offset;
 		fvp_aff1_topology_map[aff1].sibling = aff1 + 1;

 		for (aff0 = 0; aff0 < PLATFORM_MAX_CPUS_PER_CLUSTER; aff0++) {

 			mpidr = aff1 << MPIDR_AFF1_SHIFT;
 			mpidr |= aff0 << MPIDR_AFF0_SHIFT;

 			if (fvp_pwrc_read_psysr(mpidr) != PSYSR_INVALID) {
 				/*
 				 * Presence of even a single aff0 indicates
 				 * presence of parent aff1 on the FVP.
 				 */
 				aff_state = PSCI_AFF_PRESENT;
 				fvp_aff1_topology_map[aff1].state =
 					PSCI_AFF_PRESENT;
 			} else {
 				aff_state = PSCI_AFF_ABSENT;
 			}

 			fvp_aff0_topology_map[aff0_offset].child = AFFINST_INVAL;
 			fvp_aff0_topology_map[aff0_offset].state = aff_state;
 			fvp_aff0_topology_map[aff0_offset].sibling =
 				aff0_offset + 1;

 			/* Increment the absolute number of aff0s traversed */
 			aff0_offset++;
 		}

 		/* Tie-off the last aff0 sibling to -1 to avoid overflow */
 		fvp_aff0_topology_map[aff0_offset - 1].sibling = AFFINST_INVAL;
 	}

 	/* Tie-off the last aff1 sibling to AFFINST_INVAL to avoid overflow */
 	fvp_aff1_topology_map[aff1 - 1].sibling = AFFINST_INVAL;

 	topology_setup_done = 1;
 	return 0;
 }
	/*
	* Copyright (c) 2013-2014, ARM Limited and Contributors. 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 ARM 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.
	*/

	#include <string.h>
	#include <assert.h>
	#include <platform.h>
	#include <fvp_pwrc.h>
	/* TODO: Reusing psci error codes & state information. Get our own! */
	#include <psci.h>

	/* We treat '255' as an invalid affinity instance */
	#define AFFINST_INVAL 0xff

	/*******************************************************************************
	* We support 3 flavours of the FVP: Foundation, Base AEM & Base Cortex. Each
	* flavour has a different topology. The common bit is that there can be a max.
	* of 2 clusters (affinity 1) and 4 cpus (affinity 0) per cluster. So we define
	* a tree like data structure which caters to these maximum bounds. It simply
	* marks the absent affinity level instances as PSCI_AFF_ABSENT e.g. there is no
	* cluster 1 on the Foundation FVP. The 'data' field is currently unused.
	******************************************************************************/
	typedef struct {
	unsigned char sibling;
	unsigned char child;
	unsigned char state;
	unsigned int data;
	} affinity_info;

	/*******************************************************************************
	* The following two data structures store the topology tree for the fvp. There
	* is a separate array for each affinity level i.e. cpus and clusters. The child
	* and sibling references allow traversal inside and in between the two arrays.
	******************************************************************************/
	static affinity_info fvp_aff1_topology_map[PLATFORM_CLUSTER_COUNT];
	static affinity_info fvp_aff0_topology_map[PLATFORM_CORE_COUNT];

	/* Simple global variable to safeguard us from stupidity */
	static unsigned int topology_setup_done;

	/*******************************************************************************
	* This function implements a part of the critical interface between the psci
	* generic layer and the platform to allow the former to detect the platform
	* topology. psci queries the platform to determine how many affinity instances
	* are present at a particular level for a given mpidr e.g. consider a dual
	* cluster platform where each cluster has 4 cpus. A call to this function with
	* (0, 0x100) will return the number of cpus implemented under cluster 1 i.e. 4.
	* Similarly a call with (1, 0x100) will return 2 i.e. the number of clusters.
	* This is 'cause we are effectively asking how many affinity level 1 instances
	* are implemented under affinity level 2 instance 0.
	******************************************************************************/
	unsigned int plat_get_aff_count(unsigned int aff_lvl,
	unsigned long mpidr)
	{
	unsigned int aff_count = 1, ctr;
	unsigned char parent_aff_id;

	assert(topology_setup_done == 1);

	switch (aff_lvl) {
	case 3:
	case 2:
	/*
	* Assert if the parent affinity instance is not 0.
	* This also takes care of level 3 in an obfuscated way
	*/
	parent_aff_id = (mpidr >> MPIDR_AFF3_SHIFT) & MPIDR_AFFLVL_MASK;
	assert(parent_aff_id == 0);

	/*
	* Report that we implement a single instance of
	* affinity levels 2 & 3 which are AFF_ABSENT
	*/
	break;
	case 1:
	/* Assert if the parent affinity instance is not 0. */
	parent_aff_id = (mpidr >> MPIDR_AFF2_SHIFT) & MPIDR_AFFLVL_MASK;
	assert(parent_aff_id == 0);

	/* Fetch the starting index in the aff1 array */
	for (ctr = 0;
	fvp_aff1_topology_map[ctr].sibling != AFFINST_INVAL;
	ctr = fvp_aff1_topology_map[ctr].sibling) {
	aff_count++;
	}

	break;
	case 0:
	/* Assert if the cluster id is anything apart from 0 or 1 */
	parent_aff_id = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
	assert(parent_aff_id < PLATFORM_CLUSTER_COUNT);

	/* Fetch the starting index in the aff0 array */
	for (ctr = fvp_aff1_topology_map[parent_aff_id].child;
	fvp_aff0_topology_map[ctr].sibling != AFFINST_INVAL;
	ctr = fvp_aff0_topology_map[ctr].sibling) {
	aff_count++;
	}

	break;
	default:
	assert(0);
	}

	return aff_count;
	}

	/*******************************************************************************
	* This function implements a part of the critical interface between the psci
	* generic layer and the platform to allow the former to detect the state of a
	* affinity instance in the platform topology. psci queries the platform to
	* determine whether an affinity instance is present or absent. This caters for
	* topologies where an intermediate affinity level instance is missing e.g.
	* consider a platform which implements a single cluster with 4 cpus and there
	* is another cpu sitting directly on the interconnect along with the cluster.
	* The mpidrs of the cluster would range from 0x0-0x3. The mpidr of the single
	* cpu would be 0x100 to highlight that it does not belong to cluster 0. Cluster
	* 1 is however missing but needs to be accounted to reach this single cpu in
	* the topology tree. Hence it will be marked as PSCI_AFF_ABSENT. This is not
	* applicable to the FVP but depicted as an example.
	******************************************************************************/
	unsigned int plat_get_aff_state(unsigned int aff_lvl,
	unsigned long mpidr)
	{
	unsigned int aff_state = PSCI_AFF_ABSENT, idx;
	idx = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;

	assert(topology_setup_done == 1);

	switch (aff_lvl) {
	case 3:
	case 2:
	/* Report affinity levels 2 & 3 as absent */
	break;
	case 1:
	aff_state = fvp_aff1_topology_map[idx].state;
	break;
	case 0:
	/*
	* First get start index of the aff0 in its array & then add
	* to it the affinity id that we want the state of
	*/
	idx = fvp_aff1_topology_map[idx].child;
	idx += (mpidr >> MPIDR_AFF0_SHIFT) & MPIDR_AFFLVL_MASK;
	aff_state = fvp_aff0_topology_map[idx].state;
	break;
	default:
	assert(0);
	}

	return aff_state;
	}

	/*******************************************************************************
	* Handy optimization to prevent the psci implementation from traversing through
	* affinity levels which are not present while detecting the platform topology.
	******************************************************************************/
	int plat_get_max_afflvl()
	{
	return MPIDR_AFFLVL1;
	}

	/*******************************************************************************
	* This function populates the FVP specific topology information depending upon
	* the FVP flavour its running on. We construct all the mpidrs we can handle
	* and rely on the PWRC.PSYSR to flag absent cpus when their status is queried.
	******************************************************************************/
	int plat_setup_topology()
	{
	unsigned char aff0, aff1, aff_state, aff0_offset = 0;
	unsigned long mpidr;

	topology_setup_done = 0;

	for (aff1 = 0; aff1 < PLATFORM_CLUSTER_COUNT; aff1++) {

	fvp_aff1_topology_map[aff1].child = aff0_offset;
	fvp_aff1_topology_map[aff1].sibling = aff1 + 1;

	for (aff0 = 0; aff0 < PLATFORM_MAX_CPUS_PER_CLUSTER; aff0++) {

	mpidr = aff1 << MPIDR_AFF1_SHIFT;
	mpidr \|= aff0 << MPIDR_AFF0_SHIFT;

	if (fvp_pwrc_read_psysr(mpidr) != PSYSR_INVALID) {
	/*
	* Presence of even a single aff0 indicates
	* presence of parent aff1 on the FVP.
	*/
	aff_state = PSCI_AFF_PRESENT;
	fvp_aff1_topology_map[aff1].state =
	PSCI_AFF_PRESENT;
	} else {
	aff_state = PSCI_AFF_ABSENT;
	}

	fvp_aff0_topology_map[aff0_offset].child = AFFINST_INVAL;
	fvp_aff0_topology_map[aff0_offset].state = aff_state;
	fvp_aff0_topology_map[aff0_offset].sibling =
	aff0_offset + 1;

	/* Increment the absolute number of aff0s traversed */
	aff0_offset++;
	}

	/* Tie-off the last aff0 sibling to -1 to avoid overflow */
	fvp_aff0_topology_map[aff0_offset - 1].sibling = AFFINST_INVAL;
	}

	/* Tie-off the last aff1 sibling to AFFINST_INVAL to avoid overflow */
	fvp_aff1_topology_map[aff1 - 1].sibling = AFFINST_INVAL;

	topology_setup_done = 1;
	return 0;
	}