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authorWolfram Sang <wsa+renesas@sang-engineering.com>2019-02-19 17:39:46 +0100
committerWolfram Sang <wsa@the-dreams.de>2019-02-23 10:34:08 +0100
commitbb6bdd51c838e8d046a84502f12619de4fd58d69 (patch)
tree45616a63ec1871c1ec0f7e22e9abd3c489a86ade /drivers/i2c
parent63e57b6f191db99ffdd0dc6c7b9ee6b2cf7abb04 (diff)
downloadlinux-bb6bdd51c838e8d046a84502f12619de4fd58d69.tar.bz2
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.c31
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);
}