| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20170719190734.18566-5-opendmb@gmail.com>
Date: Wed, 19 Jul 2017 12:07:32 -0700
From: Doug Berger <opendmb@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Doug Berger <opendmb@...il.com>,
Jason Cooper <jason@...edaemon.net>,
Marc Zyngier <marc.zyngier@....com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Kevin Cernekee <cernekee@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Brian Norris <computersforpeace@...il.com>,
Gregory Fong <gregory.0xf0@...il.com>,
bcm-kernel-feedback-list@...adcom.com,
Marc Gonzalez <marc_gonzalez@...madesigns.com>,
Bartosz Golaszewski <brgl@...ev.pl>,
Sebastian Frias <sf84@...oste.net>,
Boris Brezillon <boris.brezillon@...e-electrons.com>,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-mips@...ux-mips.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 4/6] irqchip: brcmstb-l2: Remove some processing from the handler
Saving the generic chip pointer in the brcmstb_l2_intc_data prevents
the need to call irq_get_domain_generic_chip(). Also don't need to
save parent_irq and base there since local variables in the
brcmstb_l2_intc_of_init() function are just as good.
The handle_edge_irq flow or chained_irq_enter takes care of the
acknowledgement of the interrupt so it is redundant to clear it in
brcmstb_l2_intc_irq_handle().
irq_linear_revmap() is a fast path equivalent of irq_find_mapping()
that is appropriate to use for domain controllers of this type.
Defining irq_mask_ack is slightly more efficient than just
implementing irq_mask and irq_ack seperately.
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Doug Berger <opendmb@...il.com>
---
drivers/irqchip/irq-brcmstb-l2.c | 46 +++++++++++++++++++---------------------
1 file changed, 22 insertions(+), 24 deletions(-)
diff --git a/drivers/irqchip/irq-brcmstb-l2.c b/drivers/irqchip/irq-brcmstb-l2.c
index bddf169c4b37..977ae55d47d4 100644
--- a/drivers/irqchip/irq-brcmstb-l2.c
+++ b/drivers/irqchip/irq-brcmstb-l2.c
@@ -1,7 +1,7 @@
/*
* Generic Broadcom Set Top Box Level 2 Interrupt controller driver
*
- * Copyright (C) 2014 Broadcom Corporation
+ * Copyright (C) 2014-2017 Broadcom
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -41,9 +41,8 @@
/* L2 intc private data structure */
struct brcmstb_l2_intc_data {
- int parent_irq;
- void __iomem *base;
struct irq_domain *domain;
+ struct irq_chip_generic *gc;
bool can_wake;
u32 saved_mask; /* for suspend/resume */
};
@@ -51,15 +50,14 @@ struct brcmstb_l2_intc_data {
static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc)
{
struct brcmstb_l2_intc_data *b = irq_desc_get_handler_data(desc);
- struct irq_chip_generic *gc = irq_get_domain_generic_chip(b->domain, 0);
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int irq;
u32 status;
chained_irq_enter(chip, desc);
- status = irq_reg_readl(gc, CPU_STATUS) &
- ~(irq_reg_readl(gc, CPU_MASK_STATUS));
+ status = irq_reg_readl(b->gc, CPU_STATUS) &
+ ~(irq_reg_readl(b->gc, CPU_MASK_STATUS));
if (status == 0) {
raw_spin_lock(&desc->lock);
@@ -70,10 +68,8 @@ static void brcmstb_l2_intc_irq_handle(struct irq_desc *desc)
do {
irq = ffs(status) - 1;
- /* ack at our level */
- irq_reg_writel(gc, 1 << irq, CPU_CLEAR);
status &= ~(1 << irq);
- generic_handle_irq(irq_find_mapping(b->domain, irq));
+ generic_handle_irq(irq_linear_revmap(b->domain, irq));
} while (status);
out:
chained_irq_exit(chip, desc);
@@ -116,32 +112,33 @@ static int __init brcmstb_l2_intc_of_init(struct device_node *np,
{
unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
struct brcmstb_l2_intc_data *data;
- struct irq_chip_generic *gc;
struct irq_chip_type *ct;
int ret;
unsigned int flags;
+ int parent_irq;
+ void __iomem *base;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
- data->base = of_iomap(np, 0);
- if (!data->base) {
+ base = of_iomap(np, 0);
+ if (!base) {
pr_err("failed to remap intc L2 registers\n");
ret = -ENOMEM;
goto out_free;
}
/* Disable all interrupts by default */
- writel(0xffffffff, data->base + CPU_MASK_SET);
+ writel(0xffffffff, base + CPU_MASK_SET);
/* Wakeup interrupts may be retained from S5 (cold boot) */
data->can_wake = of_property_read_bool(np, "brcm,irq-can-wake");
if (!data->can_wake)
- writel(0xffffffff, data->base + CPU_CLEAR);
+ writel(0xffffffff, base + CPU_CLEAR);
- data->parent_irq = irq_of_parse_and_map(np, 0);
- if (!data->parent_irq) {
+ parent_irq = irq_of_parse_and_map(np, 0);
+ if (!parent_irq) {
pr_err("failed to find parent interrupt\n");
ret = -EINVAL;
goto out_unmap;
@@ -170,18 +167,19 @@ static int __init brcmstb_l2_intc_of_init(struct device_node *np,
}
/* Set the IRQ chaining logic */
- irq_set_chained_handler_and_data(data->parent_irq,
+ irq_set_chained_handler_and_data(parent_irq,
brcmstb_l2_intc_irq_handle, data);
- gc = irq_get_domain_generic_chip(data->domain, 0);
- gc->reg_base = data->base;
- gc->private = data;
- ct = gc->chip_types;
+ data->gc = irq_get_domain_generic_chip(data->domain, 0);
+ data->gc->reg_base = base;
+ data->gc->private = data;
+ ct = data->gc->chip_types;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->regs.ack = CPU_CLEAR;
ct->chip.irq_mask = irq_gc_mask_disable_reg;
+ ct->chip.irq_mask_ack = irq_gc_mask_disable_and_ack_set;
ct->regs.disable = CPU_MASK_SET;
ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
@@ -194,19 +192,19 @@ static int __init brcmstb_l2_intc_of_init(struct device_node *np,
/* This IRQ chip can wake the system, set all child interrupts
* in wake_enabled mask
*/
- gc->wake_enabled = 0xffffffff;
+ data->gc->wake_enabled = 0xffffffff;
ct->chip.irq_set_wake = irq_gc_set_wake;
}
pr_info("registered L2 intc (mem: 0x%p, parent irq: %d)\n",
- data->base, data->parent_irq);
+ base, parent_irq);
return 0;
out_free_domain:
irq_domain_remove(data->domain);
out_unmap:
- iounmap(data->base);
+ iounmap(base);
out_free:
kfree(data);
return ret;
--
2.13.0
Powered by blists - more mailing lists