arm64 fixes and cpucaps.h automatic generation:

- Generate cpucaps.h at build time rather than carrying lots of
   #defines. Merged at -rc1 to avoid some conflicts during the merging
   window.
 
 - Initialise RGSR_EL1.SEED in __cpu_setup() as it may be left as 0 out
   of reset and the IRG instruction would not function as expected if
   only the architected pseudorandom number generator is implemented.
 
 - Fix potential race condition in __sync_icache_dcache() where the
   PG_dcache_clean page flag is set before the actual cache maintenance.
 
 - Fix header include in BTI kselftests.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Catalin Marinas:
 "Fixes and cpucaps.h automatic generation:

   - Generate cpucaps.h at build time rather than carrying lots of
     #defines. Merged at -rc1 to avoid some conflicts during the merge
     window.

   - Initialise RGSR_EL1.SEED in __cpu_setup() as it may be left as 0
     out of reset and the IRG instruction would not function as expected
     if only the architected pseudorandom number generator is
     implemented.

   - Fix potential race condition in __sync_icache_dcache() where the
     PG_dcache_clean page flag is set before the actual cache
     maintenance.

   - Fix header include in BTI kselftests"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Fix race condition on PG_dcache_clean in __sync_icache_dcache()
  arm64: tools: Add __ASM_CPUCAPS_H to the endif in cpucaps.h
  arm64: mte: initialize RGSR_EL1.SEED in __cpu_setup
  kselftest/arm64: Add missing stddef.h include to BTI tests
  arm64: Generate cpucaps.h

arch/arm64/Makefile

@@ -175,6 +175,9 @@ vdso_install:
 	$(if $(CONFIG_COMPAT_VDSO), \
 		$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso32 $@)
 
+archprepare:
+	$(Q)$(MAKE) $(build)=arch/arm64/tools kapi
+
 # We use MRPROPER_FILES and CLEAN_FILES now
 archclean:
 	$(Q)$(MAKE) $(clean)=$(boot)

arch/arm64/include/asm/Kbuild

@@ -5,3 +5,5 @@ generic-y += qrwlock.h
 generic-y += qspinlock.h
 generic-y += set_memory.h
 generic-y += user.h
+
+generated-y += cpucaps.h

arch/arm64/include/asm/cpucaps.h

@@ -1,74 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * arch/arm64/include/asm/cpucaps.h
- *
- * Copyright (C) 2016 ARM Ltd.
- */
-#ifndef __ASM_CPUCAPS_H
-#define __ASM_CPUCAPS_H
-
-#define ARM64_WORKAROUND_CLEAN_CACHE		0
-#define ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE	1
-#define ARM64_WORKAROUND_845719			2
-#define ARM64_HAS_SYSREG_GIC_CPUIF		3
-#define ARM64_HAS_PAN				4
-#define ARM64_HAS_LSE_ATOMICS			5
-#define ARM64_WORKAROUND_CAVIUM_23154		6
-#define ARM64_WORKAROUND_834220			7
-#define ARM64_HAS_NO_HW_PREFETCH		8
-#define ARM64_HAS_VIRT_HOST_EXTN		11
-#define ARM64_WORKAROUND_CAVIUM_27456		12
-#define ARM64_HAS_32BIT_EL0			13
-#define ARM64_SPECTRE_V3A			14
-#define ARM64_HAS_CNP				15
-#define ARM64_HAS_NO_FPSIMD			16
-#define ARM64_WORKAROUND_REPEAT_TLBI		17
-#define ARM64_WORKAROUND_QCOM_FALKOR_E1003	18
-#define ARM64_WORKAROUND_858921			19
-#define ARM64_WORKAROUND_CAVIUM_30115		20
-#define ARM64_HAS_DCPOP				21
-#define ARM64_SVE				22
-#define ARM64_UNMAP_KERNEL_AT_EL0		23
-#define ARM64_SPECTRE_V2			24
-#define ARM64_HAS_RAS_EXTN			25
-#define ARM64_WORKAROUND_843419			26
-#define ARM64_HAS_CACHE_IDC			27
-#define ARM64_HAS_CACHE_DIC			28
-#define ARM64_HW_DBM				29
-#define ARM64_SPECTRE_V4			30
-#define ARM64_MISMATCHED_CACHE_TYPE		31
-#define ARM64_HAS_STAGE2_FWB			32
-#define ARM64_HAS_CRC32				33
-#define ARM64_SSBS				34
-#define ARM64_WORKAROUND_1418040		35
-#define ARM64_HAS_SB				36
-#define ARM64_WORKAROUND_SPECULATIVE_AT		37
-#define ARM64_HAS_ADDRESS_AUTH_ARCH		38
-#define ARM64_HAS_ADDRESS_AUTH_IMP_DEF		39
-#define ARM64_HAS_GENERIC_AUTH_ARCH		40
-#define ARM64_HAS_GENERIC_AUTH_IMP_DEF		41
-#define ARM64_HAS_IRQ_PRIO_MASKING		42
-#define ARM64_HAS_DCPODP			43
-#define ARM64_WORKAROUND_1463225		44
-#define ARM64_WORKAROUND_CAVIUM_TX2_219_TVM	45
-#define ARM64_WORKAROUND_CAVIUM_TX2_219_PRFM	46
-#define ARM64_WORKAROUND_1542419		47
-#define ARM64_HAS_E0PD				48
-#define ARM64_HAS_RNG				49
-#define ARM64_HAS_AMU_EXTN			50
-#define ARM64_HAS_ADDRESS_AUTH			51
-#define ARM64_HAS_GENERIC_AUTH			52
-#define ARM64_HAS_32BIT_EL1			53
-#define ARM64_BTI				54
-#define ARM64_HAS_ARMv8_4_TTL			55
-#define ARM64_HAS_TLB_RANGE			56
-#define ARM64_MTE				57
-#define ARM64_WORKAROUND_1508412		58
-#define ARM64_HAS_LDAPR				59
-#define ARM64_KVM_PROTECTED_MODE		60
-#define ARM64_WORKAROUND_NVIDIA_CARMEL_CNP	61
-#define ARM64_HAS_EPAN				62
-
-#define ARM64_NCAPS				63
-
-#endif /* __ASM_CPUCAPS_H */

arch/arm64/mm/flush.c

@@ -55,8 +55,10 @@ void __sync_icache_dcache(pte_t pte)
 {
 	struct page *page = pte_page(pte);
 
-	if (!test_and_set_bit(PG_dcache_clean, &page->flags))
+	if (!test_bit(PG_dcache_clean, &page->flags)) {
 		sync_icache_aliases(page_address(page), page_size(page));
+		set_bit(PG_dcache_clean, &page->flags);
+	}
 }
 EXPORT_SYMBOL_GPL(__sync_icache_dcache);
 

arch/arm64/mm/proc.S

@@ -447,6 +447,18 @@ SYM_FUNC_START(__cpu_setup)
 	mov	x10, #(SYS_GCR_EL1_RRND | SYS_GCR_EL1_EXCL_MASK)
 	msr_s	SYS_GCR_EL1, x10
 
+	/*
+	 * If GCR_EL1.RRND=1 is implemented the same way as RRND=0, then
+	 * RGSR_EL1.SEED must be non-zero for IRG to produce
+	 * pseudorandom numbers. As RGSR_EL1 is UNKNOWN out of reset, we
+	 * must initialize it.
+	 */
+	mrs	x10, CNTVCT_EL0
+	ands	x10, x10, #SYS_RGSR_EL1_SEED_MASK
+	csinc	x10, x10, xzr, ne
+	lsl	x10, x10, #SYS_RGSR_EL1_SEED_SHIFT
+	msr_s	SYS_RGSR_EL1, x10
+
 	/* clear any pending tag check faults in TFSR*_EL1 */
 	msr_s	SYS_TFSR_EL1, xzr
 	msr_s	SYS_TFSRE0_EL1, xzr

arch/arm64/tools/Makefile

@@ -0,0 +1,22 @@
+# SPDX-License-Identifier: GPL-2.0
+
+gen := arch/$(ARCH)/include/generated
+kapi := $(gen)/asm
+
+kapi-hdrs-y := $(kapi)/cpucaps.h
+
+targets += $(addprefix ../../../,$(gen-y) $(kapi-hdrs-y))
+
+PHONY += kapi
+
+kapi:   $(kapi-hdrs-y) $(gen-y)
+
+# Create output directory if not already present
+_dummy := $(shell [ -d '$(kapi)' ] || mkdir -p '$(kapi)')
+
+quiet_cmd_gen_cpucaps = GEN     $@
+      cmd_gen_cpucaps = mkdir -p $(dir $@) && \
+                     $(AWK) -f $(filter-out $(PHONY),$^) > $@
+
+$(kapi)/cpucaps.h: $(src)/gen-cpucaps.awk $(src)/cpucaps FORCE
+	$(call if_changed,gen_cpucaps)

arch/arm64/tools/cpucaps

@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Internal CPU capabilities constants, keep this list sorted
+
+BTI
+HAS_32BIT_EL0
+HAS_32BIT_EL1
+HAS_ADDRESS_AUTH
+HAS_ADDRESS_AUTH_ARCH
+HAS_ADDRESS_AUTH_IMP_DEF
+HAS_AMU_EXTN
+HAS_ARMv8_4_TTL
+HAS_CACHE_DIC
+HAS_CACHE_IDC
+HAS_CNP
+HAS_CRC32
+HAS_DCPODP
+HAS_DCPOP
+HAS_E0PD
+HAS_EPAN
+HAS_GENERIC_AUTH
+HAS_GENERIC_AUTH_ARCH
+HAS_GENERIC_AUTH_IMP_DEF
+HAS_IRQ_PRIO_MASKING
+HAS_LDAPR
+HAS_LSE_ATOMICS
+HAS_NO_FPSIMD
+HAS_NO_HW_PREFETCH
+HAS_PAN
+HAS_RAS_EXTN
+HAS_RNG
+HAS_SB
+HAS_STAGE2_FWB
+HAS_SYSREG_GIC_CPUIF
+HAS_TLB_RANGE
+HAS_VIRT_HOST_EXTN
+HW_DBM
+KVM_PROTECTED_MODE
+MISMATCHED_CACHE_TYPE
+MTE
+SPECTRE_V2
+SPECTRE_V3A
+SPECTRE_V4
+SSBS
+SVE
+UNMAP_KERNEL_AT_EL0
+WORKAROUND_834220
+WORKAROUND_843419
+WORKAROUND_845719
+WORKAROUND_858921
+WORKAROUND_1418040
+WORKAROUND_1463225
+WORKAROUND_1508412
+WORKAROUND_1542419
+WORKAROUND_CAVIUM_23154
+WORKAROUND_CAVIUM_27456
+WORKAROUND_CAVIUM_30115
+WORKAROUND_CAVIUM_TX2_219_PRFM
+WORKAROUND_CAVIUM_TX2_219_TVM
+WORKAROUND_CLEAN_CACHE
+WORKAROUND_DEVICE_LOAD_ACQUIRE
+WORKAROUND_NVIDIA_CARMEL_CNP
+WORKAROUND_QCOM_FALKOR_E1003
+WORKAROUND_REPEAT_TLBI
+WORKAROUND_SPECULATIVE_AT

arch/arm64/tools/gen-cpucaps.awk

@@ -0,0 +1,40 @@
+#!/bin/awk -f
+# SPDX-License-Identifier: GPL-2.0
+# gen-cpucaps.awk: arm64 cpucaps header generator
+#
+# Usage: awk -f gen-cpucaps.awk cpucaps.txt
+
+# Log an error and terminate
+function fatal(msg) {
+	print "Error at line " NR ": " msg > "/dev/stderr"
+	exit 1
+}
+
+# skip blank lines and comment lines
+/^$/ { next }
+/^#/ { next }
+
+BEGIN {
+	print "#ifndef __ASM_CPUCAPS_H"
+	print "#define __ASM_CPUCAPS_H"
+	print ""
+	print "/* Generated file - do not edit */"
+	cap_num = 0
+	print ""
+}
+
+/^[vA-Z0-9_]+$/ {
+	printf("#define ARM64_%-30s\t%d\n", $0, cap_num++)
+	next
+}
+
+END {
+	printf("#define ARM64_NCAPS\t\t\t\t%d\n", cap_num)
+	print ""
+	print "#endif /* __ASM_CPUCAPS_H */"
+}
+
+# Any lines not handled by previous rules are unexpected
+{
+	fatal("unhandled statement")
+}

tools/testing/selftests/arm64/bti/test.c

@@ -6,6 +6,7 @@
 
 #include "system.h"
 
+#include <stddef.h>
 #include <linux/errno.h>
 #include <linux/auxvec.h>
 #include <linux/signal.h>