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2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29 
 kernel/arch/arm64/include/asm/arch_timer.h
....@@ -1,25 +1,15 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * arch/arm64/include/asm/arch_timer.h
34  *
45  * Copyright (C) 2012 ARM Ltd.
56  * Author: Marc Zyngier <marc.zyngier@arm.com>
6
- *
7
- * This program is free software: you can redistribute it and/or modify
8
- * it under the terms of the GNU General Public License version 2 as
9
- * published by the Free Software Foundation.
10
- *
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- * This program is distributed in the hope that it will be useful,
12
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- * GNU General Public License for more details.
15
- *
16
- * You should have received a copy of the GNU General Public License
17
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
187  */
198 #ifndef __ASM_ARCH_TIMER_H
209 #define __ASM_ARCH_TIMER_H
2110 
2211 #include <asm/barrier.h>
12
+#include <asm/hwcap.h>
2313 #include <asm/sysreg.h>
2414 
2515 #include <linux/bug.h>
....@@ -31,11 +21,23 @@
3121 #include <clocksource/arm_arch_timer.h>
3222 
3323 #if IS_ENABLED(CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND)
34
-extern struct static_key_false arch_timer_read_ool_enabled;
35
-#define needs_unstable_timer_counter_workaround() \
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-	static_branch_unlikely(&arch_timer_read_ool_enabled)
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+#define has_erratum_handler(h)						\
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+	({								\
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+		const struct arch_timer_erratum_workaround *__wa;	\
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+		__wa = __this_cpu_read(timer_unstable_counter_workaround); \
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+		(__wa && __wa->h);					\
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+	})
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+
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+#define erratum_handler(h)						\
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+	({								\
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+		const struct arch_timer_erratum_workaround *__wa;	\
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+		__wa = __this_cpu_read(timer_unstable_counter_workaround); \
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+		(__wa && __wa->h) ? __wa->h : arch_timer_##h;		\
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+	})
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+
3738 #else
38
-#define needs_unstable_timer_counter_workaround()  false
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+#define has_erratum_handler(h)			   false
40
+#define erratum_handler(h)			   (arch_timer_##h)
3941 #endif
4042 
4143 enum arch_timer_erratum_match_type {
....@@ -56,28 +58,43 @@
5658 	u64 (*read_cntvct_el0)(void);
5759 	int (*set_next_event_phys)(unsigned long, struct clock_event_device *);
5860 	int (*set_next_event_virt)(unsigned long, struct clock_event_device *);
61
+	bool disable_compat_vdso;
5962 };
6063 
6164 DECLARE_PER_CPU(const struct arch_timer_erratum_workaround *,
6265 		timer_unstable_counter_workaround);
6366 
67
+/* inline sysreg accessors that make erratum_handler() work */
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+static inline notrace u32 arch_timer_read_cntp_tval_el0(void)
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+{
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+	return read_sysreg(cntp_tval_el0);
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+}
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+
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+static inline notrace u32 arch_timer_read_cntv_tval_el0(void)
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+{
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+	return read_sysreg(cntv_tval_el0);
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+}
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+
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+static inline notrace u64 arch_timer_read_cntpct_el0(void)
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+{
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+	return read_sysreg(cntpct_el0);
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+}
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+
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+static inline notrace u64 arch_timer_read_cntvct_el0(void)
84
+{
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+	return read_sysreg(cntvct_el0);
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+}
87
+
6488 #define arch_timer_reg_read_stable(reg)					\
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-({									\
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-	u64 _val;							\
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-	if (needs_unstable_timer_counter_workaround()) {		\
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-		const struct arch_timer_erratum_workaround *wa;		\
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+	({								\
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+		u64 _val;						\
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+									\
6992 		preempt_disable_notrace();				\
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-		wa = __this_cpu_read(timer_unstable_counter_workaround); \
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-		if (wa && wa->read_##reg)				\
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-			_val = wa->read_##reg();			\
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-		else							\
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-			_val = read_sysreg(reg);			\
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+		_val = erratum_handler(read_ ## reg)();			\
7594 		preempt_enable_notrace();				\
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-	} else {							\
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-		_val = read_sysreg(reg);				\
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-	}								\
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-	_val;								\
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-})
95
+									\
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+		_val;							\
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+	})
8198 
8299 /*
83100  * These register accessors are marked inline so the compiler can
....@@ -148,26 +165,7 @@
148165 	isb();
149166 }
150167 
151
-/*
152
- * Ensure that reads of the counter are treated the same as memory reads
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- * for the purposes of ordering by subsequent memory barriers.
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- *
155
- * This insanity brought to you by speculative system register reads,
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- * out-of-order memory accesses, sequence locks and Thomas Gleixner.
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- *
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- * http://lists.infradead.org/pipermail/linux-arm-kernel/2019-February/631195.html
159
- */
160
-#define arch_counter_enforce_ordering(val) do {				\
161
-	u64 tmp, _val = (val);						\
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-									\
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-	asm volatile(							\
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-	"	eor	%0, %1, %1\n"					\
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-	"	add	%0, sp, %0\n"					\
166
-	"	ldr	xzr, [%0]"					\
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-	: "=r" (tmp) : "r" (_val));					\
168
-} while (0)
169
-
170
-static inline u64 arch_counter_get_cntpct(void)
168
+static __always_inline u64 __arch_counter_get_cntpct_stable(void)
171169 {
172170 	u64 cnt;
173171 
....@@ -177,7 +175,17 @@
177175 	return cnt;
178176 }
179177 
180
-static inline u64 arch_counter_get_cntvct(void)
178
+static __always_inline u64 __arch_counter_get_cntpct(void)
179
+{
180
+	u64 cnt;
181
+
182
+	isb();
183
+	cnt = read_sysreg(cntpct_el0);
184
+	arch_counter_enforce_ordering(cnt);
185
+	return cnt;
186
+}
187
+
188
+static __always_inline u64 __arch_counter_get_cntvct_stable(void)
181189 {
182190 	u64 cnt;
183191 
....@@ -187,11 +195,31 @@
187195 	return cnt;
188196 }
189197 
190
-#undef arch_counter_enforce_ordering
198
+static __always_inline u64 __arch_counter_get_cntvct(void)
199
+{
200
+	u64 cnt;
201
+
202
+	isb();
203
+	cnt = read_sysreg(cntvct_el0);
204
+	arch_counter_enforce_ordering(cnt);
205
+	return cnt;
206
+}
191207 
192208 static inline int arch_timer_arch_init(void)
193209 {
194210 	return 0;
195211 }
196212 
213
+static inline void arch_timer_set_evtstrm_feature(void)
214
+{
215
+	cpu_set_named_feature(EVTSTRM);
216
+#ifdef CONFIG_COMPAT
217
+	compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
218
+#endif
219
+}
220
+
221
+static inline bool arch_timer_have_evtstrm_feature(void)
222
+{
223
+	return cpu_have_named_feature(EVTSTRM);
224
+}
197225 #endif