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errata: workaround for Cortex-A710 erratum 2017096

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Cortex-A710 erratum 2017096 is a Cat B erratum that applies to
revisions r0p0, r1p0 & r2p0 and is still open. The workaround is to
set CPUECLTR_EL1[8] to 1 which disables store issue prefetching.

SDEN can be found here:
https://developer.arm.com/documentation/SDEN1775101/latest

Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: If5f61ec30dbc2fab7f2c68663996057086e374e3
This commit is contained in:
Bipin Ravi 2021-03-31 18:45:55 -05:00
parent 213afde907
commit afc2ed63f9
4 changed files with 46 additions and 0 deletions
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5
docs/design/cpu-specific-build-macros.rst
View file

@ -382,6 +382,11 @@ For Cortex-A710, the following errata build flags are defined :
Cortex-A710 CPU. This needs to be enabled for revisions r1p0, r2p0 of the CPU
and is still open.
- ``ERRATA_A710_2017096``: This applies errata 2017096 workaround to
Cortex-A710 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
of the CPU and is still open.
For Neoverse N2, the following errata build flags are defined :
- ``ERRATA_N2_2067956``: This applies errata 2067956 workaround to Neoverse-N2

1
include/lib/cpus/aarch64/cortex_a710.h
View file

@ -13,6 +13,7 @@
* CPU Extended Control register specific definitions
******************************************************************************/
#define CORTEX_A710_CPUECTLR_EL1 S3_0_C15_C1_4
#define CORTEX_A710_CPUECTLR_EL1_PFSTIDIS_BIT (ULL(1) << 8)
/*******************************************************************************
* CPU Power Control register specific definitions

32
lib/cpus/aarch64/cortex_a710.S
View file

@ -133,6 +133,33 @@ func check_errata_2055002
b cpu_rev_var_ls
endfunc check_errata_2055002
/* -------------------------------------------------------------
* Errata Workaround for Cortex-A710 Erratum 2017096.
* This applies to revisions r0p0, r1p0 and r2p0 of Cortex-A710.
* Inputs:
* x0: variant[4:7] and revision[0:3] of current cpu.
* Shall clobber: x0-x17
* -------------------------------------------------------------
*/
func errata_a710_2017096_wa
/* Compare x0 against revision r0p0 to r2p0 */
mov x17, x30
bl check_errata_2017096
cbz x0, 1f
mrs x1, CORTEX_A710_CPUECTLR_EL1
orr x1, x1, CORTEX_A710_CPUECTLR_EL1_PFSTIDIS_BIT
msr CORTEX_A710_CPUECTLR_EL1, x1
1:
ret x17
endfunc errata_a710_2017096_wa
func check_errata_2017096
/* Applies to r0p0, r1p0, r2p0 */
mov x1, #0x20
b cpu_rev_var_ls
endfunc check_errata_2017096
/* ----------------------------------------------------
* HW will do the cache maintenance while powering down
* ----------------------------------------------------
@ -166,6 +193,7 @@ func cortex_a710_errata_report
report_errata ERRATA_A710_1987031, cortex_a710, 1987031
report_errata ERRATA_A710_2081180, cortex_a710, 2081180
report_errata ERRATA_A710_2055002, cortex_a710, 2055002
report_errata ERRATA_A710_2017096, cortex_a710, 2017096
ldp x8, x30, [sp], #16
ret
@ -196,6 +224,10 @@ func cortex_a710_reset_func
bl errata_a710_2055002_wa
#endif
#if ERRATA_A710_2017096
mov x0, x18
bl errata_a710_2017096_wa
#endif
isb
ret x19
endfunc cortex_a710_reset_func

8
lib/cpus/cpu-ops.mk
View file

@ -433,6 +433,10 @@ ERRATA_N2_2025414 ?=0
# to revision r1p0, r2p0 of the Cortex-A710 cpu and is still open.
ERRATA_A710_2055002 ?=0
# Flag to apply erratum 2017096 workaround during reset. This erratum applies
# to revision r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is still open.
ERRATA_A710_2017096 ?=0
# Flag to apply DSU erratum 798953. This erratum applies to DSUs revision r0p0.
# Applying the workaround results in higher DSU power consumption on idle.
ERRATA_DSU_798953 ?=0
@ -798,6 +802,10 @@ $(eval $(call add_define,ERRATA_N2_2025414))
$(eval $(call assert_boolean,ERRATA_A710_2055002))
$(eval $(call add_define,ERRATA_A710_2055002))
# Process ERRATA_A710_2017096 flag
$(eval $(call assert_boolean,ERRATA_A710_2017096))
$(eval $(call add_define,ERRATA_A710_2017096))
# Process ERRATA_DSU_798953 flag
$(eval $(call assert_boolean,ERRATA_DSU_798953))
$(eval $(call add_define,ERRATA_DSU_798953))