fix(cpus): workaround for Cortex-X2 erratum 2282622

Cortex-X2 erratum 2282622 is a Cat B erratum that applies to
all revisions <=r2p1 and is still open. The workaround is to set
CPUACTLR2_EL1[0] to 1 to force PLDW/PFRM ST to behave like
PLD/PRFM LD and not cause invalidations to other PE caches.

SDEN documentation:
https://developer.arm.com/documentation/SDEN1775100/latest

Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I43956aa4898a8608eedc5d0dd1471172c641a0c6

docs/design/cpu-specific-build-macros.rst

@@ -579,29 +579,33 @@ For Cortex-X2, the following errata build flags are defined :
 -  ``ERRATA_X2_2083908``: This applies errata 2083908 workaround to Cortex-X2
    CPU. This needs to be enabled for revision r2p0 of the CPU, it is still open.
 
--  ``ERRATA_X2_2017096``: This applies errata 2017096 workaround to
+-  ``ERRATA_X2_2017096``: This applies errata 2017096 workaround to Cortex-X2
-   Cortex-X2 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
+   CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
-   r2p0 of the CPU, it is fixed in r2p1.
+   CPU, it is fixed in r2p1.
 
--  ``ERRATA_X2_2081180``: This applies errata 2081180 workaround to
+-  ``ERRATA_X2_2081180``: This applies errata 2081180 workaround to Cortex-X2
-   Cortex-X2 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
+   CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
-   r2p0 of the CPU, it is fixed in r2p1.
+   CPU, it is fixed in r2p1.
 
--  ``ERRATA_X2_2216384``: This applies errata 2216384 workaround to
+-  ``ERRATA_X2_2216384``: This applies errata 2216384 workaround to Cortex-X2
-   Cortex-X2 CPU. This needs to be enabled only for revisions r0p0, r1p0 and
+   CPU. This needs to be enabled only for revisions r0p0, r1p0 and r2p0 of the
-   r2p0 of the CPU, it is fixed in r2p1.
+   CPU, it is fixed in r2p1.
 
--  ``ERRATA_X2_2147715``: This applies errata 2147715 workaround to
+-  ``ERRATA_X2_2147715``: This applies errata 2147715 workaround to Cortex-X2
-   Cortex-X2 CPU. This needs to be enabled only for revision r2p0 of the CPU,
+   CPU. This needs to be enabled only for revision r2p0 of the CPU, it is fixed
-   it is fixed in r2p1.
+   in r2p1.
 
--  ``ERRATA_X2_2371105``: This applies errata 2371105 workaround to
+-  ``ERRATA_X2_2282622``: This applies errata 2282622 workaround to Cortex-X2
-   Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0
+   CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
-   of the CPU and is fixed in r2p1.
+   CPU and is still open.
 
--  ``ERRATA_X2_2768515``: This applies errata 2768515 workaround to
+-  ``ERRATA_X2_2371105``: This applies errata 2371105 workaround to Cortex-X2
-   Cortex-X2 CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0
+   CPU. This needs to be enabled for revisions r0p0, r1p0 and r2p0 of the CPU
-   and r2p1 of the CPU and is still open.
+   and is fixed in r2p1.
+
+-  ``ERRATA_X2_2768515``: This applies errata 2768515 workaround to Cortex-X2
+   CPU. This needs to be enabled for revisions r0p0, r1p0, r2p0 and r2p1 of the
+   CPU and is still open.
 
 For Cortex-X3, the following errata build flags are defined :
 
@@ -742,7 +746,7 @@ GIC Errata Workarounds
 
 --------------
 
-*Copyright (c) 2014-2022, Arm Limited and Contributors. All rights reserved.*
+*Copyright (c) 2014-2023, Arm Limited and Contributors. All rights reserved.*
 
 .. _CVE-2017-5715: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715
 .. _CVE-2018-3639: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3639

lib/cpus/aarch64/cortex_x2.S

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022, Arm Limited. All rights reserved.
+ * Copyright (c) 2021-2023, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -267,6 +267,36 @@ func check_errata_2147715
 	b	cpu_rev_var_range
 endfunc check_errata_2147715
 
+	/* ---------------------------------------------------------------
+	 * Errata Workaround for Cortex-X2 Erratum 2282622.
+	 * This applies to revision r0p0, r1p0, r2p0 and r2p1.
+	 * It is still open.
+	 * Inputs:
+	 * x0: variant[4:7] and revision[0:3] of current cpu.
+	 * Shall clobber: x0, x1, x17
+	 * ---------------------------------------------------------------
+	 */
+func errata_x2_2282622_wa
+	/* Compare x0 against revision r2p1 */
+	mov     x17, x30
+	bl      check_errata_2282622
+	cbz     x0, 1f
+
+	/* Apply the workaround */
+	mrs     x1, CORTEX_X2_CPUACTLR2_EL1
+	orr     x1, x1, #BIT(0)
+	msr     CORTEX_X2_CPUACTLR2_EL1, x1
+
+1:
+	ret     x17
+endfunc errata_x2_2282622_wa
+
+func check_errata_2282622
+	/* Applies to r0p0, r1p0, r2p0 and r2p1 */
+	mov     x1, #0x21
+	b       cpu_rev_var_ls
+endfunc check_errata_2282622
+
 	/* -------------------------------------------------------
 	 * Errata Workaround for Cortex-X2 Erratum 2371105.
 	 * This applies to revisions <= r2p0 and is fixed in r2p1.
@@ -362,6 +392,7 @@ func cortex_x2_errata_report
 	report_errata ERRATA_X2_2083908, cortex_x2, 2083908
 	report_errata ERRATA_X2_2147715, cortex_x2, 2147715
 	report_errata ERRATA_X2_2216384, cortex_x2, 2216384
+	report_errata ERRATA_X2_2282622, cortex_x2, 2282622
 	report_errata ERRATA_X2_2371105, cortex_x2, 2371105
 	report_errata ERRATA_X2_2768515, cortex_x2, 2768515
 	report_errata WORKAROUND_CVE_2022_23960, cortex_x2, cve_2022_23960
@@ -421,6 +452,11 @@ func cortex_x2_reset_func
 	bl	errata_x2_2147715_wa
 #endif
 
+#if ERRATA_X2_2282622
+	mov	x0, x18
+	bl	errata_x2_2282622_wa
+#endif
+
 #if ERRATA_X2_2371105
 	mov	x0, x18
 	bl	errata_x2_2371105_wa

lib/cpus/cpu-ops.mk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2014-2022, Arm Limited and Contributors. All rights reserved.
+# Copyright (c) 2014-2023, Arm Limited and Contributors. All rights reserved.
 # Copyright (c) 2020-2022, NVIDIA Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
@@ -657,6 +657,11 @@ ERRATA_X2_2216384	?=0
 # only to revision r2p0 of the Cortex-X2 cpu, it is fixed in r2p1.
 ERRATA_X2_2147715	?=0
 
+# Flag to apply erratum 2282622 workaround during reset. This erratum applies
+# to revision r0p0, r1p0, r2p0 and r2p1 of the Cortex-X2 cpu and is still
+# open.
+ERRATA_X2_2282622	?=0
+
 # Flag to apply erratum 2371105 workaround during reset. This erratum applies
 # to revision r0p0, r1p0 and r2p0 of the Cortex-X2 cpu and is fixed in r2p1.
 ERRATA_X2_2371105	?=0
@@ -1299,6 +1304,10 @@ $(eval $(call add_define,ERRATA_X2_2216384))
 $(eval $(call assert_boolean,ERRATA_X2_2147715))
 $(eval $(call add_define,ERRATA_X2_2147715))
 
+# Process ERRATA_X2_2282622 flag
+$(eval $(call assert_boolean,ERRATA_X2_2282622))
+$(eval $(call add_define,ERRATA_X2_2282622))
+
 # Process ERRATA_X2_2371105 flag
 $(eval $(call assert_boolean,ERRATA_X2_2371105))
 $(eval $(call add_define,ERRATA_X2_2371105))