Line Managers and the Management team will require information on a specific employee or may require reports based on employee data. This needs to be provided by HR
Some of the reports could be count of employees by Department, Location, or Grade, employee costs by various categories, or employees who meet certain criteria such as location, grade, qualifications/skills, etc.
For salary level comparison, you also need a list of employee grouped by certain proximity parameters and their salaries.
There are also reports for a period such as heads count, joinees in a period, attrition, reasons for people leaving, confirmations due, etc.