linux-kernel - [PATCH v3 08/16] powerpc/watchpoint: Disable all available watchpoints when !dawr_force

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Date:   Tue, 14 Apr 2020 08:46:51 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     mpe@...erman.id.au, mikey@...ling.org
Cc:     apopple@...ux.ibm.com, paulus@...ba.org, npiggin@...il.com,
        christophe.leroy@....fr, naveen.n.rao@...ux.vnet.ibm.com,
        peterz@...radead.org, jolsa@...nel.org, oleg@...hat.com,
        fweisbec@...il.com, mingo@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        ravi.bangoria@...ux.ibm.com
Subject: [PATCH v3 08/16] powerpc/watchpoint: Disable all available watchpoints when !dawr_force_enable

Instead of disabling only first watchpoint, disable all available
watchpoints while clearing dawr_force_enable.

Callback function is used only for disabling watchpoint, rename it
to disable_dawrs_cb(). And null_brk parameter is not really required
while disabling watchpoint, remove it.

Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
---
 arch/powerpc/kernel/dawr.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/kernel/dawr.c b/arch/powerpc/kernel/dawr.c
index 8114ad3a8574..7f8c69ab537a 100644
--- a/arch/powerpc/kernel/dawr.c
+++ b/arch/powerpc/kernel/dawr.c
@@ -50,9 +50,13 @@ int set_dawr(int nr, struct arch_hw_breakpoint *brk)
 	return 0;
 }
 
-static void set_dawr_cb(void *info)
+static void disable_dawrs_cb(void *info)
 {
-	set_dawr(0, info);
+	struct arch_hw_breakpoint null_brk = {0};
+	int i;
+
+	for (i = 0; i < nr_wp_slots(); i++)
+		set_dawr(i, &null_brk);
 }
 
 static ssize_t dawr_write_file_bool(struct file *file,
@@ -74,7 +78,7 @@ static ssize_t dawr_write_file_bool(struct file *file,
 
 	/* If we are clearing, make sure all CPUs have the DAWR cleared */
 	if (!dawr_force_enable)
-		smp_call_function(set_dawr_cb, &null_brk, 0);
+		smp_call_function(disable_dawrs_cb, NULL, 0);
 
 	return rc;
 }
-- 
2.21.1