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pve-kernel-lowlatency-qoup/pinctl-amd-ryzen-01-make-use-of-raw_spinlock-variants.patch
Fabian Grünbichler 5aa54b7501 fix #1366: pinctl fix for AMD Ryzen on Gigabyte MBs
2017-06-12 13:24:57 +02:00

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From 78388cbea036c9a9e2fd0c71e21d608cfc63939a Mon Sep 17 00:00:00 2001
From: Julia Cartwright <julia@ni.com>
Date: Thu, 1 Jun 2017 13:12:16 +0800
Subject: [PATCH] pinctrl: amd: make use of raw_spinlock variants
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
BugLink: https://bugs.launchpad.net/bugs/1671360
The amd pinctrl drivers currently implement an irq_chip for handling
interrupts; due to how irq_chip handling is done, it's necessary for the
irq_chip methods to be invoked from hardirq context, even on a a
real-time kernel. Because the spinlock_t type becomes a "sleeping"
spinlock w/ RT kernels, it is not suitable to be used with irq_chips.
A quick audit of the operations under the lock reveal that they do only
minimal, bounded work, and are therefore safe to do under a raw spinlock.
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 229710fecdd805abb753c480778ea0de47cbb1e2)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
drivers/pinctrl/pinctrl-amd.h | 2 +-
drivers/pinctrl/pinctrl-amd.c | 66 +++++++++++++++++++++----------------------
2 files changed, 34 insertions(+), 34 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-amd.h b/drivers/pinctrl/pinctrl-amd.h
index 7bfea47dbb47..4d5d5cac48a9 100644
--- a/drivers/pinctrl/pinctrl-amd.h
+++ b/drivers/pinctrl/pinctrl-amd.h
@@ -86,7 +86,7 @@ struct amd_function {
};
struct amd_gpio {
- spinlock_t lock;
+ raw_spinlock_t lock;
void __iomem *base;
const struct amd_pingroup *groups;
diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c
index 537b52055756..cfcf9db02c7d 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -41,11 +41,11 @@ static int amd_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
u32 pin_reg;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
pin_reg &= ~BIT(OUTPUT_ENABLE_OFF);
writel(pin_reg, gpio_dev->base + offset * 4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return 0;
}
@@ -57,7 +57,7 @@ static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
pin_reg |= BIT(OUTPUT_ENABLE_OFF);
if (value)
@@ -65,7 +65,7 @@ static int amd_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
else
pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
writel(pin_reg, gpio_dev->base + offset * 4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return 0;
}
@@ -76,9 +76,9 @@ static int amd_gpio_get_value(struct gpio_chip *gc, unsigned offset)
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return !!(pin_reg & BIT(PIN_STS_OFF));
}
@@ -89,14 +89,14 @@ static void amd_gpio_set_value(struct gpio_chip *gc, unsigned offset, int value)
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
if (value)
pin_reg |= BIT(OUTPUT_VALUE_OFF);
else
pin_reg &= ~BIT(OUTPUT_VALUE_OFF);
writel(pin_reg, gpio_dev->base + offset * 4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
@@ -108,7 +108,7 @@ static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
unsigned long flags;
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + offset * 4);
if (debounce) {
@@ -159,7 +159,7 @@ static int amd_gpio_set_debounce(struct gpio_chip *gc, unsigned offset,
pin_reg &= ~DB_CNTRl_MASK;
}
writel(pin_reg, gpio_dev->base + offset * 4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return ret;
}
@@ -208,9 +208,9 @@ static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
for (; i < pin_num; i++) {
seq_printf(s, "pin%d\t", i);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + i * 4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
if (pin_reg & BIT(INTERRUPT_ENABLE_OFF)) {
interrupt_enable = "interrupt is enabled|";
@@ -315,12 +315,12 @@ static void amd_gpio_irq_enable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
pin_reg |= BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static void amd_gpio_irq_disable(struct irq_data *d)
@@ -330,12 +330,12 @@ static void amd_gpio_irq_disable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg &= ~BIT(INTERRUPT_ENABLE_OFF);
pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static void amd_gpio_irq_mask(struct irq_data *d)
@@ -345,11 +345,11 @@ static void amd_gpio_irq_mask(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static void amd_gpio_irq_unmask(struct irq_data *d)
@@ -359,11 +359,11 @@ static void amd_gpio_irq_unmask(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg |= BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static void amd_gpio_irq_eoi(struct irq_data *d)
@@ -373,11 +373,11 @@ static void amd_gpio_irq_eoi(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
reg |= EOI_MASK;
writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
}
static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
@@ -388,7 +388,7 @@ static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
/* Ignore the settings coming from the client and
@@ -453,7 +453,7 @@ static int amd_gpio_irq_set_type(struct irq_data *d, unsigned int type)
pin_reg |= CLR_INTR_STAT << INTERRUPT_STS_OFF;
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return ret;
}
@@ -494,14 +494,14 @@ static void amd_gpio_irq_handler(struct irq_desc *desc)
chained_irq_enter(chip, desc);
/*enable GPIO interrupt again*/
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG1);
reg64 = reg;
reg64 = reg64 << 32;
reg = readl(gpio_dev->base + WAKE_INT_STATUS_REG0);
reg64 |= reg;
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
/*
* first 46 bits indicates interrupt status.
@@ -529,11 +529,11 @@ static void amd_gpio_irq_handler(struct irq_desc *desc)
if (handled == 0)
handle_bad_irq(desc);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
reg = readl(gpio_dev->base + WAKE_INT_MASTER_REG);
reg |= EOI_MASK;
writel(reg, gpio_dev->base + WAKE_INT_MASTER_REG);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
chained_irq_exit(chip, desc);
}
@@ -585,9 +585,9 @@ static int amd_pinconf_get(struct pinctrl_dev *pctldev,
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
enum pin_config_param param = pinconf_to_config_param(*config);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + pin*4);
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
switch (param) {
case PIN_CONFIG_INPUT_DEBOUNCE:
arg = pin_reg & DB_TMR_OUT_MASK;
@@ -627,7 +627,7 @@ static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
enum pin_config_param param;
struct amd_gpio *gpio_dev = pinctrl_dev_get_drvdata(pctldev);
- spin_lock_irqsave(&gpio_dev->lock, flags);
+ raw_spin_lock_irqsave(&gpio_dev->lock, flags);
for (i = 0; i < num_configs; i++) {
param = pinconf_to_config_param(configs[i]);
arg = pinconf_to_config_argument(configs[i]);
@@ -666,7 +666,7 @@ static int amd_pinconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
writel(pin_reg, gpio_dev->base + pin*4);
}
- spin_unlock_irqrestore(&gpio_dev->lock, flags);
+ raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
return ret;
}
@@ -734,7 +734,7 @@ static int amd_gpio_probe(struct platform_device *pdev)
if (!gpio_dev)
return -ENOMEM;
- spin_lock_init(&gpio_dev->lock);
+ raw_spin_lock_init(&gpio_dev->lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
--
2.11.0
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