fix(cpus): workaround for Neoverse V1 erratum 2743093
Neoverse V1 erratum 2743093 is a Cat B erratum that applies to
all revisions <=r1p2 and is still open. The workaround is to
insert a dsb before the isb in the power down sequence.
SDEN documentation:
https://developer.arm.com/documentation/SDEN1401781/latest
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I8ee7c16c14c4fd6ee35d20c855273ecfce0d1b32
diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst
index c07a0aa..ac2db09 100644
--- a/docs/design/cpu-specific-build-macros.rst
+++ b/docs/design/cpu-specific-build-macros.rst
@@ -460,6 +460,10 @@
CPU. This needs to be enabled for revisions r0p0, r1p0 and r1p1 of the CPU.
It is still open.
+- ``ERRATA_V1_2743093``: This applies errata 2743093 workaround to Neoverse-V1
+ CPU. This needs to be enabled for revisions r0p0, r1p0, r1p1 and r1p2 of the
+ CPU. It is still open.
+
For Cortex-A710, the following errata build flags are defined :
- ``ERRATA_A710_1987031``: This applies errata 1987031 workaround to
diff --git a/lib/cpus/aarch64/neoverse_v1.S b/lib/cpus/aarch64/neoverse_v1.S
index 3282fbc..c3a70ca 100644
--- a/lib/cpus/aarch64/neoverse_v1.S
+++ b/lib/cpus/aarch64/neoverse_v1.S
@@ -462,6 +462,30 @@
b cpu_rev_var_ls
endfunc check_errata_2372203
+ /* ----------------------------------------------------
+ * Errata Workaround for Neoverse V1 Errata #2743093.
+ * This applies to revisions <= r1p2 and is still open.
+ * x0: variant[4:7] and revision[0:3] of current cpu.
+ * Shall clobber: x0-x17
+ * ----------------------------------------------------
+ */
+func errata_neoverse_v1_2743093_wa
+ mov x17, x30
+ bl check_errata_2743093
+ cbz x0, 1f
+
+ /* dsb before isb of power down sequence */
+ dsb sy
+1:
+ ret x17
+endfunc errata_neoverse_v1_2743093_wa
+
+func check_errata_2743093
+ /* Applies to all revisions <= r1p2 */
+ mov x1, #0x12
+ b cpu_rev_var_ls
+endfunc check_errata_2743093
+
func check_errata_cve_2022_23960
#if WORKAROUND_CVE_2022_23960
mov x0, #ERRATA_APPLIES
@@ -483,6 +507,12 @@
mrs x0, NEOVERSE_V1_CPUPWRCTLR_EL1
orr x0, x0, #NEOVERSE_V1_CPUPWRCTLR_EL1_CORE_PWRDN_BIT
msr NEOVERSE_V1_CPUPWRCTLR_EL1, x0
+#if ERRATA_V1_2743093
+ mov x15, x30
+ bl cpu_get_rev_var
+ bl errata_neoverse_v1_2743093_wa
+ mov x30, x15
+#endif /* ERRATA_V1_2743093 */
isb
ret
endfunc neoverse_v1_core_pwr_dwn
@@ -513,6 +543,7 @@
report_errata ERRATA_V1_2216392, neoverse_v1, 2216392
report_errata ERRATA_V1_2294912, neoverse_v1, 2294912
report_errata ERRATA_V1_2372203, neoverse_v1, 2372203
+ report_errata ERRATA_V1_2743093, neoverse_v1, 2743093
report_errata WORKAROUND_CVE_2022_23960, neoverse_v1, cve_2022_23960
ldp x8, x30, [sp], #16
diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk
index 527a82f..69c474e 100644
--- a/lib/cpus/cpu-ops.mk
+++ b/lib/cpus/cpu-ops.mk
@@ -516,6 +516,11 @@
# to revisions r0p0, r1p0 and r1p1 of the Neoverse V1 cpu and is still open.
ERRATA_V1_2372203 ?=0
+# Flag to apply erratum 2743093 workaround during powerdown. This erratum
+# applies to revisions r0p0, r1p0, r1p1 and r1p2 of the Neoverse V1 cpu and is
+# still open.
+ERRATA_V1_2743093 ?=0
+
# Flag to apply erratum 1987031 workaround during reset. This erratum applies
# to revisions r0p0, r1p0 and r2p0 of the Cortex-A710 cpu and is still open.
ERRATA_A710_1987031 ?=0
@@ -1162,6 +1167,10 @@
$(eval $(call assert_boolean,ERRATA_V1_2372203))
$(eval $(call add_define,ERRATA_V1_2372203))
+# Process ERRATA_V1_2743093 flag
+$(eval $(call assert_boolean,ERRATA_V1_2743093))
+$(eval $(call add_define,ERRATA_V1_2743093))
+
# Process ERRATA_A710_1987031 flag
$(eval $(call assert_boolean,ERRATA_A710_1987031))
$(eval $(call add_define,ERRATA_A710_1987031))