diff options
| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2019-02-19 17:39:46 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2019-02-23 10:34:08 +0100 |
| commit | bb6bdd51c838e8d046a84502f12619de4fd58d69 (patch) | |
| tree | 45616a63ec1871c1ec0f7e22e9abd3c489a86ade /drivers/i2c | |
| parent | 63e57b6f191db99ffdd0dc6c7b9ee6b2cf7abb04 (diff) | |
| download | lwn-bb6bdd51c838e8d046a84502f12619de4fd58d69.tar.gz lwn-bb6bdd51c838e8d046a84502f12619de4fd58d69.zip | |
i2c: gpio: fault-injector: add 'inject_panic' injector
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-gpio.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-gpio.c b/drivers/i2c/busses/i2c-gpio.c index 76e43783f50f..bba5c4627de3 100644 --- a/drivers/i2c/busses/i2c-gpio.c +++ b/drivers/i2c/busses/i2c-gpio.c @@ -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); } |