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Correctly dimension the PSCI aff_map_node array

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The array of affinity nodes is currently allocated for 32 entries
with the PSCI_NUM_AFFS value defined in psci.h. This is not enough
for large systems, and will substantially over allocate the array
for small systems.

This patch introduces an optional platform definition
PLATFORM_NUM_AFFS to platform_def.h. If defined this value is
used for PSCI_NUM_AFFS, otherwise a value of two times the number
of CPU cores is used.

The FVP port defines PLATFORM_NUM_AFFS to be 10 which saves
nearly 1.5KB of memory.

Fixes ARM-software/tf-issues#192

Change-Id: I68e30ac950de88cfbd02982ba882a18fb69c1445
This commit is contained in:
Andrew Thoelke 2014-06-20 00:36:14 +01:00
parent 13ac44a5c7
commit 6c0b45d1ce
4 changed files with 15 additions and 3 deletions
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5
docs/porting-guide.md
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@ -150,6 +150,11 @@ file is found in [plat/fvp/include/platform_def.h].
Defines the maximum number of CPUs that can be implemented within a cluster
on the platform.
* **#define : PLATFORM_NUM_AFFS**
Defines the total number of nodes in the affinity heirarchy at all affinity
levels used by the platform.
* **#define : PRIMARY_CPU**
Defines the `MPIDR` of the primary CPU on the platform. This value is used

3
include/bl31/services/psci.h
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@ -128,9 +128,6 @@
#define psci_validate_power_state(pstate) (pstate & PSTATE_VALID_MASK)
/* Number of affinity instances whose state this psci imp. can track */
#define PSCI_NUM_AFFS 32ull
#ifndef __ASSEMBLY__
#include <stdint.h>

2
plat/fvp/include/platform_def.h
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@ -75,6 +75,8 @@
#define PLATFORM_CORE_COUNT (PLATFORM_CLUSTER1_CORE_COUNT + \
PLATFORM_CLUSTER0_CORE_COUNT)
#define PLATFORM_MAX_CPUS_PER_CLUSTER 4
#define PLATFORM_NUM_AFFS (PLATFORM_CLUSTER_COUNT + \
PLATFORM_CORE_COUNT)
#define PRIMARY_CPU 0x0
#define MAX_IO_DEVICES 3
#define MAX_IO_HANDLES 4

8
services/std_svc/psci/psci_private.h
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@ -33,8 +33,16 @@
#include <arch.h>
#include <bakery_lock.h>
#include <platform_def.h> /* for PLATFORM_NUM_AFFS */
#include <psci.h>
/* Number of affinity instances whose state this psci imp. can track */
#ifdef PLATFORM_NUM_AFFS
#define PSCI_NUM_AFFS PLATFORM_NUM_AFFS
#else
#define PSCI_NUM_AFFS (2 * PLATFORM_CORE_COUNT)
#endif
/*******************************************************************************
* The following two data structures hold the topology tree which in turn tracks
* the state of the all the affinity instances supported by the platform.