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i2c: gpio: fault-injector: add 'inject_panic' injector

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Add a fault injector simulating a Kernel panic happening after starting
a transfer. Read the docs for its usage.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang
2019-02-19 17:39:46 +01:00
committed by Wolfram Sang
parent 63e57b6f19
commit bb6bdd51c8
2 changed files with 56 additions and 1 deletions
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31
drivers/i2c/busses/i2c-gpio.c
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@@ -231,6 +231,32 @@ static int fops_lose_arbitration_set(void *data, u64 duration)
}
DEFINE_DEBUGFS_ATTRIBUTE(fops_lose_arbitration, NULL, fops_lose_arbitration_set, "%llu\n");
static irqreturn_t inject_panic_irq(int irq, void *dev_id)
{
struct i2c_gpio_private_data *priv = dev_id;
udelay(priv->scl_irq_data);
panic("I2C fault injector induced panic");
return IRQ_HANDLED;
}
static int fops_inject_panic_set(void *data, u64 duration)
{
struct i2c_gpio_private_data *priv = data;
if (duration > 100 * 1000)
return -EINVAL;
priv->scl_irq_data = duration;
/*
* Interrupt on falling SCL. This ensures that the master under test has
* really started the transfer.
*/
return i2c_gpio_fi_act_on_scl_irq(priv, inject_panic_irq);
}
DEFINE_DEBUGFS_ATTRIBUTE(fops_inject_panic, NULL, fops_inject_panic_set, "%llu\n");
static void i2c_gpio_fault_injector_init(struct platform_device *pdev)
{
struct i2c_gpio_private_data *priv = platform_get_drvdata(pdev);
@@ -256,9 +282,12 @@ static void i2c_gpio_fault_injector_init(struct platform_device *pdev)
priv, &fops_incomplete_addr_phase);
debugfs_create_file_unsafe("incomplete_write_byte", 0200, priv->debug_dir,
priv, &fops_incomplete_write_byte);
if (priv->bit_data.getscl)
if (priv->bit_data.getscl) {
debugfs_create_file_unsafe("inject_panic", 0200, priv->debug_dir,
priv, &fops_inject_panic);
debugfs_create_file_unsafe("lose_arbitration", 0200, priv->debug_dir,
priv, &fops_lose_arbitration);
}
debugfs_create_file_unsafe("scl", 0600, priv->debug_dir, priv, &fops_scl);
debugfs_create_file_unsafe("sda", 0600, priv->debug_dir, priv, &fops_sda);
}