> -----Original Message----- > From: Lukas Auer <lukas.a...@aisec.fraunhofer.de> > Sent: Wednesday, March 6, 2019 4:23 AM > To: u-boot@lists.denx.de > Cc: Atish Patra <atish.pa...@wdc.com>; Anup Patel > <anup.pa...@wdc.com>; Bin Meng <bmeng...@gmail.com>; Andreas > Schwab <sch...@suse.de>; Palmer Dabbelt <pal...@sifive.com>; > Alexander Graf <ag...@suse.de>; Lukas Auer > <lukas.a...@aisec.fraunhofer.de>; Anup Patel <a...@brainfault.org>; Rick > Chen <r...@andestech.com> > Subject: [PATCH v2 1/9] riscv: add infrastructure for calling functions on > other > harts > > Harts on RISC-V boot independently, U-Boot is responsible for managing > them. Functions are called on other harts with smp_call_function(), which > sends inter-processor interrupts (IPIs) to all other available harts. > Available > harts are those marked as available in the device tree and present in the > available_harts mask stored in global data. The available_harts mask is used > to register all harts that have entered U-Boot. Functions are specified with > their address and two function arguments (argument 2 and 3). The first > function argument is always the hart ID of the hart calling the function. On > the other harts, the IPI interrupt handler handle_ipi() must be called on > software interrupts to handle the request and call the specified function. > > Functions are stored in the ipi_data data structure. Every hart has its own > data structure in global data. While this is not required at the moment (all > harts are expected to boot Linux), this does allow future expansion, where > other harts may be used for monitoring or other tasks. > > Signed-off-by: Lukas Auer <lukas.a...@aisec.fraunhofer.de> > --- > > Changes in v2: > - Remove unneeded quotes from NR_CPUS Kconfig entry > - Move memory barrier from send_ipi_many() to handle_ipi() > - Add check in send_ipi_many so that IPIs are only sent to available harts as > indicated by the available_harts mask
Reviewed-by: Anup Patel <anup.pa...@wdc.com> Regards, Anup _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot
