From 741dd04c812f0bd3015f8e934cb9da84e068040e Mon Sep 17 00:00:00 2001 From: laurenw-arm Date: Mon, 2 Aug 2021 15:00:15 -0500 Subject: [PATCH] errata: workaround for Neoverse V1 errata 1925756 Neoverse V1 erratum 1925756 is a Cat B erratum present in r0p0, r1p0, and r1p1 of the V1 processor core, and it is still open. SDEN can be found here: https://documentation-service.arm.com/static/60d499080320e92fa40b4625 Signed-off-by: Lauren Wehrmeister Change-Id: I6500dc98da92a7c405b9ae09d794d666e8f4ae52 --- docs/design/cpu-specific-build-macros.rst | 3 ++ include/lib/cpus/aarch64/neoverse_v1.h | 1 + lib/cpus/aarch64/neoverse_v1.S | 34 +++++++++++++++++++++++ lib/cpus/cpu-ops.mk | 8 ++++++ 4 files changed, 46 insertions(+) diff --git a/docs/design/cpu-specific-build-macros.rst b/docs/design/cpu-specific-build-macros.rst index 217686ea0..aa1a247df 100644 --- a/docs/design/cpu-specific-build-macros.rst +++ b/docs/design/cpu-specific-build-macros.rst @@ -337,6 +337,9 @@ For Neoverse V1, the following errata build flags are defined : CPU. This needs to be enabled only for revisions r0p0 and r1p0, it is fixed in r1p1. +- ``ERRATA_V1_1925756``: This applies errata 1925756 workaround to Neoverse-V1 + CPU. This needs to be enabled for r0p0, r1p0, and r1p1, it is still open. + - ``ERRATA_V1_1940577``: This applies errata 1940577 workaround to Neoverse-V1 CPU. This needs to be enabled only for revision r1p0 and r1p1 of the CPU. diff --git a/include/lib/cpus/aarch64/neoverse_v1.h b/include/lib/cpus/aarch64/neoverse_v1.h index 7104d36f9..cfb26ab61 100644 --- a/include/lib/cpus/aarch64/neoverse_v1.h +++ b/include/lib/cpus/aarch64/neoverse_v1.h @@ -13,6 +13,7 @@ * CPU Extended Control register specific definitions. ******************************************************************************/ #define NEOVERSE_V1_CPUECTLR_EL1 S3_0_C15_C1_4 +#define NEOVERSE_V1_CPUECTLR_EL1_BIT_8 (ULL(1) << 8) #define NEOVERSE_V1_CPUECTLR_EL1_BIT_53 (ULL(1) << 53) /******************************************************************************* diff --git a/lib/cpus/aarch64/neoverse_v1.S b/lib/cpus/aarch64/neoverse_v1.S index 38e9d3f92..2e088a128 100644 --- a/lib/cpus/aarch64/neoverse_v1.S +++ b/lib/cpus/aarch64/neoverse_v1.S @@ -105,6 +105,34 @@ func check_errata_1852267 b cpu_rev_var_ls endfunc check_errata_1852267 + /* -------------------------------------------------- + * Errata Workaround for Neoverse V1 Errata #1925756. + * This applies to revisions <= r1p1. + * x0: variant[4:7] and revision[0:3] of current cpu. + * Shall clobber: x0-x17 + * -------------------------------------------------- + */ +func errata_neoverse_v1_1925756_wa + /* Check workaround compatibility. */ + mov x17, x30 + bl check_errata_1925756 + cbz x0, 1f + + /* Set bit 8 in CPUECTLR_EL1 */ + mrs x1, NEOVERSE_V1_CPUECTLR_EL1 + orr x1, x1, #NEOVERSE_V1_CPUECTLR_EL1_BIT_8 + msr NEOVERSE_V1_CPUECTLR_EL1, x1 + isb +1: + ret x17 +endfunc errata_neoverse_v1_1925756_wa + +func check_errata_1925756 + /* Applies to <= r1p1. */ + mov x1, #0x11 + b cpu_rev_var_ls +endfunc check_errata_1925756 + /* -------------------------------------------------- * Errata Workaround for Neoverse V1 Erratum #1940577 * This applies to revisions r1p0 - r1p1 and is open. @@ -193,6 +221,7 @@ func neoverse_v1_errata_report report_errata ERRATA_V1_1774420, neoverse_v1, 1774420 report_errata ERRATA_V1_1791573, neoverse_v1, 1791573 report_errata ERRATA_V1_1852267, neoverse_v1, 1852267 + report_errata ERRATA_V1_1925756, neoverse_v1, 1925756 report_errata ERRATA_V1_1940577, neoverse_v1, 1940577 ldp x8, x30, [sp], #16 @@ -222,6 +251,11 @@ func neoverse_v1_reset_func bl errata_neoverse_v1_1852267_wa #endif +#if ERRATA_V1_1925756 + mov x0, x18 + bl errata_neoverse_v1_1925756_wa +#endif + #if ERRATA_V1_1940577 mov x0, x18 bl errata_neoverse_v1_1940577_wa diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk index 92a7f7505..f48293274 100644 --- a/lib/cpus/cpu-ops.mk +++ b/lib/cpus/cpu-ops.mk @@ -384,6 +384,10 @@ ERRATA_V1_1791573 ?=0 # to revisions r0p0 and r1p0 of the Neoverse V1 core, and was fixed in r1p1. ERRATA_V1_1852267 ?=0 +# Flag to apply erratum 1925756 workaround during reset. This needs to be +# enabled for r0p0, r1p0, and r1p1 of the Neoverse V1 core, it is still open. +ERRATA_V1_1925756 ?=0 + # Flag to apply erratum 1940577 workaround during reset. This erratum applies # to revisions r1p0 and r1p1 of the Neoverse V1 cpu. ERRATA_V1_1940577 ?=0 @@ -705,6 +709,10 @@ $(eval $(call add_define,ERRATA_V1_1791573)) $(eval $(call assert_boolean,ERRATA_V1_1852267)) $(eval $(call add_define,ERRATA_V1_1852267)) +# Process ERRATA_V1_1925756 flag +$(eval $(call assert_boolean,ERRATA_V1_1925756)) +$(eval $(call add_define,ERRATA_V1_1925756)) + # Process ERRATA_V1_1940577 flag $(eval $(call assert_boolean,ERRATA_V1_1940577)) $(eval $(call add_define,ERRATA_V1_1940577))