add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/include/asm/hw_breakpoint.h
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@@ -1,36 +1,27 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * PowerPC BookIII S hardware breakpoint definitions
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  *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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- *
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  * Copyright 2010, IBM Corporation.
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  * Author: K.Prasad <prasad@linux.vnet.ibm.com>
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- *
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  */
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 #ifndef _PPC_BOOK3S_64_HW_BREAKPOINT_H
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 #define _PPC_BOOK3S_64_HW_BREAKPOINT_H
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+
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+#include <asm/cpu_has_feature.h>
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+#include <asm/inst.h>
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 #ifdef	__KERNEL__
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 struct arch_hw_breakpoint {
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 	unsigned long	address;
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 	u16		type;
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 	u16		len; /* length of the target data symbol */
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+	u16		hw_len; /* length programmed in hw */
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+	u8		flags;
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 };
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-/* Note: Don't change the the first 6 bits below as they are in the same order
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+/* Note: Don't change the first 6 bits below as they are in the same order
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  * as the dabr and dabrx.
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  */
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 #define HW_BRK_TYPE_READ		0x01
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@@ -47,6 +38,31 @@
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 #define HW_BRK_TYPE_PRIV_ALL	(HW_BRK_TYPE_USER | HW_BRK_TYPE_KERNEL | \
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 				 HW_BRK_TYPE_HYP)
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+#define HW_BRK_FLAG_DISABLED	0x1
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+
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+/* Minimum granularity */
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+#ifdef CONFIG_PPC_8xx
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+#define HW_BREAKPOINT_SIZE  0x4
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+#else
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+#define HW_BREAKPOINT_SIZE  0x8
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+#endif
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+#define HW_BREAKPOINT_SIZE_QUADWORD	0x10
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+
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+#define DABR_MAX_LEN	8
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+#define DAWR_MAX_LEN	512
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+
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+static inline int nr_wp_slots(void)
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+{
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+	return cpu_has_feature(CPU_FTR_DAWR1) ? 2 : 1;
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+}
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+
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+bool wp_check_constraints(struct pt_regs *regs, struct ppc_inst instr,
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+			  unsigned long ea, int type, int size,
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+			  struct arch_hw_breakpoint *info);
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+
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+void wp_get_instr_detail(struct pt_regs *regs, struct ppc_inst *instr,
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+			 int *type, int *size, unsigned long *ea);
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+
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 #ifdef CONFIG_HAVE_HW_BREAKPOINT
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 #include <linux/kdebug.h>
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 #include <asm/reg.h>
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@@ -58,8 +74,6 @@
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 struct perf_sample_data;
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 struct task_struct;
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-#define HW_BREAKPOINT_ALIGN 0x7
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-
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 extern int hw_breakpoint_slots(int type);
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 extern int arch_bp_generic_fields(int type, int *gen_bp_type);
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 extern int arch_check_bp_in_kernelspace(struct arch_hw_breakpoint *hw);
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@@ -70,7 +84,6 @@
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 						unsigned long val, void *data);
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 int arch_install_hw_breakpoint(struct perf_event *bp);
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 void arch_uninstall_hw_breakpoint(struct perf_event *bp);
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-void arch_unregister_hw_breakpoint(struct perf_event *bp);
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 void hw_breakpoint_pmu_read(struct perf_event *bp);
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 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
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@@ -79,13 +92,14 @@
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 			struct perf_sample_data *data, struct pt_regs *regs);
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 static inline void hw_breakpoint_disable(void)
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 {
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-	struct arch_hw_breakpoint brk;
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+	int i;
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+	struct arch_hw_breakpoint null_brk = {0};
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-	brk.address = 0;
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-	brk.type = 0;
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-	brk.len = 0;
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-	if (ppc_breakpoint_available())
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-		__set_breakpoint(&brk);
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+	if (!ppc_breakpoint_available())
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+		return;
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+
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+	for (i = 0; i < nr_wp_slots(); i++)
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+		__set_breakpoint(i, &null_brk);
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 }
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 extern void thread_change_pc(struct task_struct *tsk, struct pt_regs *regs);
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 int hw_breakpoint_handler(struct die_args *args);
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@@ -94,6 +108,21 @@
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 static inline void hw_breakpoint_disable(void) { }
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 static inline void thread_change_pc(struct task_struct *tsk,
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 					struct pt_regs *regs) { }
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+
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 #endif	/* CONFIG_HAVE_HW_BREAKPOINT */
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+
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+
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+#ifdef CONFIG_PPC_DAWR
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+extern bool dawr_force_enable;
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+static inline bool dawr_enabled(void)
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+{
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+	return dawr_force_enable;
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+}
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+int set_dawr(int nr, struct arch_hw_breakpoint *brk);
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+#else
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+static inline bool dawr_enabled(void) { return false; }
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+static inline int set_dawr(int nr, struct arch_hw_breakpoint *brk) { return -1; }
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+#endif
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+
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 #endif	/* __KERNEL__ */
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 #endif	/* _PPC_BOOK3S_64_HW_BREAKPOINT_H */