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PSCI: fix limit of 256 CPUs caused by cast to unsigned char

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In psci_setup.c psci_init_pwr_domain_node() takes an unsigned
char as node_idx which limits it to initialising only the first
256 CPUs. As the calling function does not check for a limit of
256 I think this is a bug so change the unsigned char to
uint16_t and change the cast from the calling site in
populate_power_domain_tree().

Also update the non_cpu_pwr_domain_node structure lock_index
to uint16_t and update the function signature for psci_lock_init()
appropriately.

Finally add a define PSCI_MAX_CPUS_INDEX to psci_private.h and add
a CASSERT to psci_setup.c to make sure PLATFORM_CORE_COUNT cannot
exceed the index value.

Signed-off-by: Graeme Gregory <graeme@nuviainc.com>
Change-Id: I9e26842277db7483fd698b46bbac62aa86e71b45
This commit is contained in:
Graeme Gregory 2020-12-02 16:24:32 +00:00
parent 669ee776cc
commit a86865ac42
2 changed files with 19 additions and 4 deletions
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9
lib/psci/psci_private.h
View file

@ -42,6 +42,11 @@
define_psci_cap(PSCI_SYSTEM_RESET2_AARCH64) | \
define_psci_cap(PSCI_MEM_CHK_RANGE_AARCH64))
/* Internally PSCI uses a uint16_t for various cpu indexes so
* define a limit to number of CPUs that can be initialised.
*/
#define PSCI_MAX_CPUS_INDEX 0xFFFFU
/*
* Helper functions to get/set the fields of PSCI per-cpu data.
*/
@ -134,7 +139,7 @@ typedef struct non_cpu_pwr_domain_node {
unsigned char level;
/* For indexing the psci_lock array*/
unsigned char lock_index;
uint16_t lock_index;
} non_cpu_pd_node_t;
typedef struct cpu_pwr_domain_node {
@ -239,7 +244,7 @@ static inline void psci_lock_release(non_cpu_pd_node_t *non_cpu_pd_node)
#endif /* HW_ASSISTED_COHERENCY */
static inline void psci_lock_init(non_cpu_pd_node_t *non_cpu_pd_node,
unsigned char idx)
uint16_t idx)
{
non_cpu_pd_node[idx].lock_index = idx;
}

14
lib/psci/psci_setup.c
View file

@ -17,6 +17,12 @@
#include "psci_private.h"
/*
* Check that PLATFORM_CORE_COUNT fits into the number of cores
* that can be represented by PSCI_MAX_CPUS_INDEX.
*/
CASSERT(PLATFORM_CORE_COUNT <= (PSCI_MAX_CPUS_INDEX + 1U), assert_psci_cores_overflow);
/*******************************************************************************
* Per cpu non-secure contexts used to program the architectural state prior
* return to the normal world.
@ -34,11 +40,13 @@ unsigned int psci_caps;
* Function which initializes the 'psci_non_cpu_pd_nodes' or the
* 'psci_cpu_pd_nodes' corresponding to the power level.
******************************************************************************/
static void __init psci_init_pwr_domain_node(unsigned char node_idx,
static void __init psci_init_pwr_domain_node(uint16_t node_idx,
unsigned int parent_idx,
unsigned char level)
{
if (level > PSCI_CPU_PWR_LVL) {
assert(node_idx < PSCI_NUM_NON_CPU_PWR_DOMAINS);
psci_non_cpu_pd_nodes[node_idx].level = level;
psci_lock_init(psci_non_cpu_pd_nodes, node_idx);
psci_non_cpu_pd_nodes[node_idx].parent_node = parent_idx;
@ -47,6 +55,8 @@ static void __init psci_init_pwr_domain_node(unsigned char node_idx,
} else {
psci_cpu_data_t *svc_cpu_data;
assert(node_idx < PLATFORM_CORE_COUNT);
psci_cpu_pd_nodes[node_idx].parent_node = parent_idx;
/* Initialize with an invalid mpidr */
@ -144,7 +154,7 @@ static unsigned int __init populate_power_domain_tree(const unsigned char
for (j = node_index;
j < (node_index + num_children); j++)
psci_init_pwr_domain_node((unsigned char)j,
psci_init_pwr_domain_node((uint16_t)j,
parent_node_index - 1U,
(unsigned char)level);