opensbi.git/lib/utils/irqchip/fdt_irqchip_plic.c, branch master

lib: utils/irqchip: Fix context_map init in irqchip_plic_update_context_map()

2026-03-22T05:22:43Z

The context_map[][] elements should be initialized with negative value so that context_map does not point to anything for non-existent PLIC contexts. Fixes: 69448a079065 ("lib: utils/irqchip: plic: Provide a hartindex to context map") Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20260213055342.3124872-4-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

lib: sbi: Use sbi_hart_count() and sbi_for_each_hartindex()

2025-03-24T12:27:20Z

Simplify the code and improve consistency by using the new macros where possible. sbi_hart_count() obsoletes sbi_scratch_last_hartindex(). Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

Revert "lib: utils/irqchip: Match against more specific compatible strings first"

2025-03-24T11:07:52Z

This reverts commit 6019259dfbdf9322858b4e7cfc3d1448376e2aa0. Now that fdt_driver_init_by_offset() respects the compatible string fallback priority order, this workaround is no longer necessary. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: Match against more specific compatible strings first

2025-02-19T16:19:08Z

The T-HEAD C90x PLIC has some special quirks, such as the S-mode delegation bit. OpenSBI currently handles this by checking the compatible string in the device tree. However, this matching is done in the order of the fdt_match array. So if a device tree contains both strings, for example: compatible = "thead,c900-plic", "riscv,plic0"; Then OpenSBI will match against the generic "riscv,plic0" string, since that appears first in the fdt_match array. This means it will fail to set the S-mode delegation bit, and Linux will fail to boot. In some cases, it is not possible to change the compatible string to just the T-HEAD PLIC, as older versions of Linux only recognize the RISC-V compatible string. This patch fixes that by moving the RISC-V string to the end, ensuring that the more specific options get matched first. Signed-off-by: Alex Studer Reviewed-by: Anup Patel

lib: utils/irqchip: Use fdt_driver for initialization

2025-02-12T15:52:37Z

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

platform: Drop irqchip warm init and exit hooks

2024-11-28T06:16:36Z

Now that driver lifecycle is managed from within the SBI irqchip core, platforms need only to initialize the driver once during cold init. Remove the remaining platform hooks that are no longer used. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi_irqchip: Call driver warm_init from SBI core

2024-11-28T06:10:17Z

Currently, each platform keeps track of which irqchip driver is in use and calls its warm init function. Since the generic platform may use multiple irqchip drivers, it has logic to track an array of drivers. The code is simplified and made common across platforms by treating warm init and exit as properties of the driver, not the platform. Then the platform's only role is to select and prepare a driver during cold boot. For now, only add a .warm_init hook, since none of the existing drivers need an .exit hook. It could be added in the future if needed. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: Move per-hart data from fdt_plic to plic

2024-11-28T06:05:01Z

The per-hart PLIC pointer is not really specific to FDT platforms. Move it into the main driver and drop the extra wrapper functions. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: plic: Common PM save/restore

2024-11-28T05:58:38Z

Move the PLIC save/restore functions inside the driver, so they can be reused on any platform that needs them. The memory needed to store the PLIC context is also allocated by the driver. The PM data cannot be completely encapsulated, as some platforms (including Allwinner D1) need to program the IRQ enable status to a sideband interrupt controller for wakeup capability. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/irqchip: plic: Provide a hartindex to context map

2024-11-28T04:06:46Z

This removes platform-specific arguments to plic_warm_irqchip_init(), which makes the driver independent from the platform after cold init, and allows for further refactoring. Signed-off-by: Samuel Holland Reviewed-by: Anup Patel