On Sun, Mar 17, 2019 at 07:28:31PM +0100, Lukas Auer wrote:
This patch series adds SMP support for RISC-V to U-Boot. It allows U-Boot to run on multi-hart systems (hart is the RISC-V terminology for hardware thread). Images passed to bootm will be started on all harts. The bootm command is currently the only one that will boot images on all harts, bootefi is not yet supported.
The patches have been successfully tested on both QEMU (machine and supervisor mode) and the HiFive Unleashed board (supervisor mode), using BBL and OpenSBI.
Can you describe the test configuration and boot flow a little more, or post an SDcard image that boots with the switches as shown in the readme at [1]
I don't see any board-specific memory initialization code anywhere, so I assume you are still using the original SiFive FSBL, and not the u-boot version that includes the memory init code [2]
[1] https://github.com/sifive/freedom-u-sdk [2] https://github.com/sifive/HiFive_U-Boot
Mainline QEMU requires two patches [1, 2] to run in this configuration. Patch [1] has been dropped and will be replaced with a U-Boot patch.
Changes in v3:
- Print error if riscv_send_ipi() fails
- Adjust error message for failures of riscv_clear_ipi() to match error
message for failures of riscv_send_ipi()
- New patch to save the hart ID in register tp instead of s0
- Adjust patch to use the new location of the hart ID (register tp)
- New patch to hang if relocation of secondary harts fails
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
- Implement hart lottery to pick main hart to run U-Boot
- Remove CONFIG_MAIN_HART as it is not required anymore
- Register available harts in the available_harts mask
- New patch to populate register a0 with the hart ID from the mhartid
CSR in machine-mode
- New patch to enable SMP on the SiFive FU540, which was previously sent
independently
Lukas Auer (11): riscv: add infrastructure for calling functions on other harts riscv: import the supervisor binary interface header file riscv: implement IPI platform functions using SBI riscv: delay initialization of caches and debug UART riscv: save hart ID in register tp instead of s0 riscv: add support for multi-hart systems riscv: boot images passed to bootm on all harts riscv: do not rely on hart ID passed by previous boot stage riscv: hang if relocation of secondary harts fails riscv: fu540: enable SMP riscv: qemu: enable SMP
arch/riscv/Kconfig | 28 +++++ arch/riscv/cpu/cpu.c | 9 +- arch/riscv/cpu/start.S | 167 +++++++++++++++++++++++++-- arch/riscv/include/asm/csr.h | 1 + arch/riscv/include/asm/global_data.h | 6 + arch/riscv/include/asm/sbi.h | 94 +++++++++++++++ arch/riscv/include/asm/smp.h | 53 +++++++++ arch/riscv/lib/Makefile | 2 + arch/riscv/lib/asm-offsets.c | 1 + arch/riscv/lib/bootm.c | 13 ++- arch/riscv/lib/sbi_ipi.c | 25 ++++ arch/riscv/lib/smp.c | 118 +++++++++++++++++++ board/emulation/qemu-riscv/Kconfig | 1 + board/sifive/fu540/Kconfig | 1 + 14 files changed, 507 insertions(+), 12 deletions(-) create mode 100644 arch/riscv/include/asm/sbi.h create mode 100644 arch/riscv/include/asm/smp.h create mode 100644 arch/riscv/lib/sbi_ipi.c create mode 100644 arch/riscv/lib/smp.c
-- 2.20.1
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