summaryrefslogtreecommitdiff
path: root/drivers/firmware/arm_sdei.c
AgeCommit message (Collapse)Author
2018-01-15firmware: arm_sdei: Fix return value check in sdei_present_dt()Wei Yongjun
In case of error, the function of_platform_device_create() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Fixes: 677a60bd2003 ("firmware: arm_sdei: Discover SDEI support via ACPI") Acked-by: James Morse <james.morse@arm.com> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2018-01-14firmware: arm_sdei: Discover SDEI support via ACPIJames Morse
SDEI defines a new ACPI table to indicate the presence of the interface. The conduit is discovered in the same way as PSCI. For ACPI we need to create the platform device ourselves as SDEI doesn't have an entry in the DSDT. The SDEI platform device should be created after ACPI has been initialised so that we can parse the table, but before GHES devices are created, which may register SDE events if they use SDEI as their notification type. Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2018-01-14firmware: arm_sdei: add support for CPU private eventsJames Morse
Private SDE events are per-cpu, and need to be registered and enabled on each CPU. Hide this detail from the caller by adapting our {,un}register and {en,dis}able calls to send an IPI to each CPU if the event is private. CPU private events are unregistered when the CPU is powered-off, and re-registered when the CPU is brought back online. This saves bringing secondary cores back online to call private_reset() on shutdown, kexec and resume from hibernate. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2018-01-13firmware: arm_sdei: Add support for CPU and system power statesJames Morse
When a CPU enters an idle lower-power state or is powering off, we need to mask SDE events so that no events can be delivered while we are messing with the MMU as the registered entry points won't be valid. If the system reboots, we want to unregister all events and mask the CPUs. For kexec this allows us to hand a clean slate to the next kernel instead of relying on it to call sdei_{private,system}_data_reset(). For hibernate we unregister all events and re-register them on restore, in case we restored with the SDE code loaded at a different address. (e.g. KASLR). Add all the notifiers necessary to do this. We only support shared events so all events are left registered and enabled over CPU hotplug. Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: James Morse <james.morse@arm.com> [catalin.marinas@arm.com: added CPU_PM_ENTER_FAILED case] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2018-01-13firmware: arm_sdei: Add driver for Software Delegated ExceptionsJames Morse
The Software Delegated Exception Interface (SDEI) is an ARM standard for registering callbacks from the platform firmware into the OS. This is typically used to implement firmware notifications (such as firmware-first RAS) or promote an IRQ that has been promoted to a firmware-assisted NMI. Add the code for detecting the SDEI version and the framework for registering and unregistering events. Subsequent patches will add the arch-specific backend code and the necessary power management hooks. Only shared events are supported, power management, private events and discovery for ACPI systems will be added by later patches. Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>