opensbi.git/include/sbi_utils/ipi, branch master

lib: utils/ipi: Convert IPI drivers as early drivers

2025-09-16T04:26:31Z

The fdt_ipi_init() is already called from generic_early_init() so let's convert IPI drivers as early drivers. Signed-off-by: Anup Patel Reviewed-by: Samuel Holland Tested-by: Nick Hu Link: https://lore.kernel.org/r/20250904052410.546818-4-apatel@ventanamicro.com Signed-off-by: Anup Patel

lib: utils/ipi: Use fdt_driver for initialization

2024-11-28T12:12:05Z

The ipi driver subsystem does not need any extra data, so it can use `struct fdt_driver` directly. The generic fdt_ipi_init() performs a best-effort initialization of all matching DT nodes. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

platform: Drop IPI warm init and exit hooks

2024-11-11T12:51:04Z

Now that the SBI IPI core clears IPIs at warm boot in a generic way, none of the drivers or platforms use these hooks, and we can remove them. Platforms need only to initialize the driver once during cold init. If other hooks are needed in the future, they can be added to struct sbi_ipi_device. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_ipi: Move initial IPI clear to sbi_ipi_init()

2024-11-11T12:48:35Z

sbi_ipi_init() expects the platform warm init function to clear IPIs on the local hart, but there is already a generic function to do this. After this change, none of the existing drivers need a warm init callback. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/ipi: Constify FDT pointers in parsing functions

2024-08-24T07:32:33Z

Indicate that none of these functions modify the devicetree by constifying the parameter type. Signed-off-by: Samuel Holland Reviewed-by: Andrew Jones Reviewed-by: Anup Patel

lib: ipi: Adjust Andes PLICSW to single-bit-per-hart scheme

2023-12-06T11:53:27Z

The old scheme doesn't allow sending hart0 self-IPI as the corresponding bit on pending register is hardwired to 0, this could lead to unhandle IPIs on SMP systems, esp. on single-core. Furthermore, the limitation of old scheme is 8-core, instead of reserving source hart information, we assign bit (x + 1) as the enable and pending bit of hartx, this also expands the bootable hart number. The following diagram shows the enable bits of the new scheme on 32-core Andes platform. Pending regs: 0x1000 x---0---0---0---0------0---0 Pending hart ID: 0 1 2 3 ... 30 31 Interrupt ID: 0 1 2 3 4 ... 31 32 | | | | | | | Enable regs: 0x2000 x---1---0---0---0-...--0---0---> hart0 | | | | | | | 0x2080 x---0---1---0---0-...--0---0---> hart1 | | | | | | | 0x2100 x---0---0---1---0-...--0---0---> hart2 | | | | | | | 0x2180 x---0---0---0---1-...--0---0---> hart3 . . . . . . . . . . . . . . . . . . . . . 0x2f00 x---0---0---0---0-...--1---0---> hart30 | | | | | | | 0x2f80 x---0---0---0---0-...--0---1---> hart31 <-------- word 0 -------><--- word 1 ---> To send IPI to hart0, for example, another hart (including hart0 itself) will set bit 1 of first word on the pending register. We also fix indentation in andes_plicsw.h along with this patch. Fixes: ce7c490719ed ("lib: utils/ipi: Add Andes fdt ipi driver support") Signed-off-by: Leo Yu-Chi Liang Reviewed-by: Yu Chien Peter Lin Reviewed-by: Randolph Reported-by: Lad Prabhakar Link: https://lists.infradead.org/pipermail/opensbi/2023-October/005665.html Reviewed-by: Lad Prabhakar Tested-by: Lad Prabhakar Reviewed-by: Anup Patel

lib: utils/ipi: Add Andes fdt ipi driver support

2022-10-23T05:01:01Z

Move Andes PLICSW ipi device to fdt ipi framework, this patch is based on Leo's modified IPI scheme on PLICSW. Current IPI scheme uses bit 0 of pending reigster on PLICSW to send IPI from hart 0 to hart 7, but bit 0 needs to be hardwired to 0 according to spec. After some investigation, self-IPI seems to be seldom or never used, so we re-order the IPI scheme to support 8 core platforms. dts example (Quad-core AX45MP): plicsw: interrupt-controller@e6400000 { compatible = "andestech,plicsw"; reg = <0x00000000 0xe6400000 0x00000000 0x00400000>; interrupts-extended = <&CPU0_intc 3 &CPU1_intc 3 &CPU2_intc 3 &CPU3_intc 3>; interrupt-controller; #address-cells = <2>; #interrupt-cells = <2>; }; Signed-off-by: Yu Chien Peter Lin Reviewed-by: Anup Patel

lib: utils/ipi: Use kconfig for enabling/disabling drivers

2022-08-08T04:03:45Z

We update ipi drivers makefile to use kconfig for enabling/disabling drivers. To avoid compile errors, we also enable appropriate ipi drivers for each platform. Signed-off-by: Anup Patel Tested-by: Andrew Jones Acked-by: Atish Patra Tested-by: Atish Patra

lib: utils/ipi: Add ACLINT MSWI library

2021-06-24T04:09:44Z

We add common ACLINT MSWI library similar to the CLINT library so that OpenSBI platforms can use it. Signed-off-by: Anup Patel Reviewed-by: Bin Meng Reviewed-by: Xiang W

lib: sbi: Simplify ipi platform operations

2021-04-28T11:33:31Z

Instead of having ipi_send() and ipi_clear() callbacks in platform operations, it will be much simpler for ipi driver to directly register these operations as a device to sbi_ipi implementation. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis