linux-kernel - [PATCH v3 4/6] bus: brcmstb_gisb: remove low-level ARM hooks

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Message-Id: <20170330002914.7371-5-opendmb@gmail.com>
Date:   Wed, 29 Mar 2017 17:29:12 -0700
From:   Doug Berger <opendmb@...il.com>
To:     mark.rutland@....com
Cc:     robh+dt@...nel.org, computersforpeace@...il.com,
        gregory.0xf0@...il.com, f.fainelli@...il.com,
        bcm-kernel-feedback-list@...adcom.com, linus.walleij@...aro.org,
        treding@...dia.com, jonathanh@...dia.com, olof@...om.net,
        mirza.krak@...il.com, suzuki.poulose@....com,
        bgolaszewski@...libre.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        catalin.marinas@....com, will.deacon@....com,
        Doug Berger <opendmb@...il.com>
Subject: [PATCH v3 4/6] bus: brcmstb_gisb: remove low-level ARM hooks

The ARM architecture can provide meaningful diagnostic
output from the GISB arbiter solely from interrupts and
notifiers without the need to hook the low level fault
handlers.

Signed-off-by: Doug Berger <opendmb@...il.com>
---
 drivers/bus/brcmstb_gisb.c | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c
index a2e1c5c25a3a..3fbc116e6b95 100644
--- a/drivers/bus/brcmstb_gisb.c
+++ b/drivers/bus/brcmstb_gisb.c
@@ -28,11 +28,6 @@
 #include <linux/kdebug.h>
 #include <linux/notifier.h>
 
-#ifdef CONFIG_ARM
-#include <asm/bug.h>
-#include <asm/signal.h>
-#endif
-
 #ifdef CONFIG_MIPS
 #include <asm/traps.h>
 #endif
@@ -228,27 +223,6 @@ static int brcmstb_gisb_arb_decode_addr(struct brcmstb_gisb_arb_device *gdev,
 	return 0;
 }
 
-#ifdef CONFIG_ARM
-static int brcmstb_bus_error_handler(unsigned long addr, unsigned int fsr,
-				     struct pt_regs *regs)
-{
-	int ret = 0;
-	struct brcmstb_gisb_arb_device *gdev;
-
-	/* iterate over each GISB arb registered handlers */
-	list_for_each_entry(gdev, &brcmstb_gisb_arb_device_list, next)
-		ret |= brcmstb_gisb_arb_decode_addr(gdev, "bus error");
-	/*
-	 * If it was an imprecise abort, then we need to correct the
-	 * return address to be _after_ the instruction.
-	*/
-	if (fsr & (1 << 10))
-		regs->ARM_pc += 4;
-
-	return ret;
-}
-#endif
-
 #ifdef CONFIG_MIPS
 static int brcmstb_bus_error_handler(struct pt_regs *regs, int is_fixup)
 {
@@ -415,10 +389,6 @@ static int __init brcmstb_gisb_arb_probe(struct platform_device *pdev)
 
 	list_add_tail(&gdev->next, &brcmstb_gisb_arb_device_list);
 
-#ifdef CONFIG_ARM
-	hook_fault_code(22, brcmstb_bus_error_handler, SIGBUS, 0,
-			"imprecise external abort");
-#endif
 #ifdef CONFIG_MIPS
 	board_be_handler = brcmstb_bus_error_handler;
 #endif
-- 
2.12.0