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    Subject[PATCH v2 3/3] venus: Add a debugfs file for SSR trigger
    Date
    The SSR (SubSystem Restart) is used to simulate an error on FW
    side of Venus. We support following type of triggers - fatal error,
    div by zero and watchdog IRQ.

    Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
    ---
    drivers/media/platform/qcom/venus/dbgfs.c | 31 +++++++++++++++++++++++
    1 file changed, 31 insertions(+)

    diff --git a/drivers/media/platform/qcom/venus/dbgfs.c b/drivers/media/platform/qcom/venus/dbgfs.c
    index a2465fe8e20b..59d52e5af64a 100644
    --- a/drivers/media/platform/qcom/venus/dbgfs.c
    +++ b/drivers/media/platform/qcom/venus/dbgfs.c
    @@ -9,6 +9,35 @@

    extern int venus_fw_debug;

    +static int trigger_ssr_open(struct inode *inode, struct file *file)
    +{
    + file->private_data = inode->i_private;
    + return 0;
    +}
    +
    +static ssize_t trigger_ssr_write(struct file *filp, const char __user *buf,
    + size_t count, loff_t *ppos)
    +{
    + struct venus_core *core = filp->private_data;
    + u32 ssr_type;
    + int ret;
    +
    + ret = kstrtou32_from_user(buf, count, 4, &ssr_type);
    + if (ret)
    + return ret;
    +
    + ret = hfi_core_trigger_ssr(core, ssr_type);
    + if (ret < 0)
    + return ret;
    +
    + return count;
    +}
    +
    +static const struct file_operations ssr_fops = {
    + .open = trigger_ssr_open,
    + .write = trigger_ssr_write,
    +};
    +
    int venus_dbgfs_init(struct venus_core *core)
    {
    core->root = debugfs_create_dir("venus", NULL);
    @@ -17,6 +46,8 @@ int venus_dbgfs_init(struct venus_core *core)

    debugfs_create_x32("fw_level", 0644, core->root, &venus_fw_debug);

    + debugfs_create_file("trigger_ssr", 0200, core->root, core, &ssr_fops);
    +
    return 0;
    }

    --
    2.17.1
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