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Implement {spe,sve}_supported() helpers and refactor code

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Implement helpers to test if the core supports SPE/SVE.  We have a
similar helper for AMU and this patch makes all extensions consistent
in their implementation.

Change-Id: I3e6f7522535ca358259ad142550b19fcb883ca67
Signed-off-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
This commit is contained in:
Dimitris Papastamos 2018-02-19 14:52:19 +00:00
parent c7aa7fdf56
commit 2ff8fbf3b0
4 changed files with 135 additions and 129 deletions
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3
include/lib/extensions/spe.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -7,6 +7,7 @@
#ifndef __SPE_H__
#define __SPE_H__
int spe_supported(void);
void spe_enable(int el2_unused);
void spe_disable(void);

3
include/lib/extensions/sve.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -7,6 +7,7 @@
#ifndef __SVE_H__
#define __SVE_H__
int sve_supported(void);
void sve_enable(int el2_unused);
#endif /* __SVE_H__ */

29
lib/extensions/spe/spe.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -14,14 +14,21 @@
*/
#define psb_csync() asm volatile("hint #17")
void spe_enable(int el2_unused)
int spe_supported(void)
{
uint64_t features;
features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT;
if ((features & ID_AA64DFR0_PMS_MASK) == 1) {
return (features & ID_AA64DFR0_PMS_MASK) == 1;
}
void spe_enable(int el2_unused)
{
uint64_t v;
if (!spe_supported())
return;
if (el2_unused) {
/*
* MDCR_EL2.TPMS (ARM v8.2): Do not trap statistical
@ -46,16 +53,14 @@ void spe_enable(int el2_unused)
v |= MDCR_NSPB(MDCR_NSPB_EL1);
write_mdcr_el3(v);
}
}
void spe_disable(void)
{
uint64_t features;
features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT;
if ((features & ID_AA64DFR0_PMS_MASK) == 1) {
uint64_t v;
if (!spe_supported())
return;
/* Drain buffered data */
psb_csync();
dsbnsh();
@ -66,19 +71,15 @@ void spe_disable(void)
write_pmblimitr_el1(v);
isb();
}
}
static void *spe_drain_buffers_hook(const void *arg)
{
uint64_t features;
if (!spe_supported())
return (void *)-1;
features = read_id_aa64dfr0_el1() >> ID_AA64DFR0_PMS_SHIFT;
if ((features & ID_AA64DFR0_PMS_MASK) == 1) {
/* Drain buffered data */
psb_csync();
dsbnsh();
}
return 0;
}

31
lib/extensions/sve/sve.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -9,14 +9,21 @@
#include <pubsub.h>
#include <sve.h>
static void *disable_sve_hook(const void *arg)
int sve_supported(void)
{
uint64_t features;
features = read_id_aa64pfr0_el1() >> ID_AA64PFR0_SVE_SHIFT;
if ((features & ID_AA64PFR0_SVE_MASK) == 1) {
return (features & ID_AA64PFR0_SVE_MASK) == 1;
}
static void *disable_sve_hook(const void *arg)
{
uint64_t cptr;
if (!sve_supported())
return (void *)-1;
/*
* Disable SVE, SIMD and FP access for the Secure world.
* As the SIMD/FP registers are part of the SVE Z-registers, any
@ -32,18 +39,16 @@ static void *disable_sve_hook(const void *arg)
* No explicit ISB required here as ERET to switch to Secure
* world covers it
*/
}
return 0;
}
static void *enable_sve_hook(const void *arg)
{
uint64_t features;
features = read_id_aa64pfr0_el1() >> ID_AA64PFR0_SVE_SHIFT;
if ((features & ID_AA64PFR0_SVE_MASK) == 1) {
uint64_t cptr;
if (!sve_supported())
return (void *)-1;
/*
* Enable SVE, SIMD and FP access for the Non-secure world.
*/
@ -55,17 +60,16 @@ static void *enable_sve_hook(const void *arg)
* No explicit ISB required here as ERET to switch to Non-secure
* world covers it
*/
}
return 0;
}
void sve_enable(int el2_unused)
{
uint64_t features;
features = read_id_aa64pfr0_el1() >> ID_AA64PFR0_SVE_SHIFT;
if ((features & ID_AA64PFR0_SVE_MASK) == 1) {
uint64_t cptr;
if (!sve_supported())
return;
#if CTX_INCLUDE_FPREGS
/*
* CTX_INCLUDE_FPREGS is not supported on SVE enabled systems.
@ -120,7 +124,6 @@ void sve_enable(int el2_unused)
* Non-secure world covers it.
*/
}
}
SUBSCRIBE_TO_EVENT(cm_exited_normal_world, disable_sve_hook);
SUBSCRIBE_TO_EVENT(cm_entering_normal_world, enable_sve_hook);