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

lib: sbi_irqchip: Allow registering interrupt handlers

2026-03-22T05:25:58Z

To handle external interrupts in M-mode, the sbi_irqchip framework must allow registering interrupt handlers from device drivers. Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20260213055342.3124872-9-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

lib: sbi_irqchip: Associate 32-bit unique ID for each irqchip device

2026-03-22T05:25:08Z

Allow locating irqchip device instance using a unique 32-bit ID. This 32-bit unique ID can be set by the irqchip driver at the time of adding irqchip device. Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20260213055342.3124872-8-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

lib: sbi_irqchip: Support irqchip device targetting subset of harts

2026-03-22T05:23:33Z

It is possible to have platform where an irqchip device targets a subset of harts and there are multiple irqchip devices to cover all harts. To support this scenario: 1) Add target_harts hartmask to struct sbi_irqchip_device which represents the set of harts targetted by the irqchip device 2) Call warm_init() and process_hwirqs() callbacks of an irqchip device on a hart only if irqchip device targets that particular hart Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20260213055342.3124872-6-anup.patel@oss.qualcomm.com Signed-off-by: Anup Patel

lib: utils/irqchip: plic: context_id is signed

2025-11-10T08:14:17Z

Array context_id in struct plic_data has elements of type s16. A negative valid indicates an invalid entry. Copying the array element to a u32 scalar hides the sign. Use s16 as target type when copying an array element to a scalar. Addresses-Coverity-ID: 1667176 Unsigned compared against 0 Addresses-Coverity-ID: 1667178 Logically dead code Addresses-Coverity-ID: 1667179 Unsigned compared against 0 Addresses-Coverity-ID: 1667182 Logically dead code Signed-off-by: Heinrich Schuchardt Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251105110121.47130-1-heinrich.schuchardt@canonical.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

lib: utils: Fix irqchip registration for PLIC and APLIC

2024-12-24T08:36:09Z

Currently, the same irqchip instance is registered for multiple PLIC and APLIC instances which causes the sbi_list_for_each_entry() loop in the sbi_irqchip_init() to hang at boot-time. To address the above issue, register a separate irqchip instance for each PLIC and APLIC instance. Fixes: 2dd6eaf68055 ("lib: sbi_irqchip: Call driver warm_init from SBI core") Reported-by: Himanshu Chauhan Signed-off-by: Anup Patel Reviewed-by: Himanshu Chauhan

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: sbi_irqchip: Register devices during cold init

2024-11-28T06:07:25Z

Have the SBI irqchip core keep track of registered irqchip devices. This is useful for any callbacks the irqchip driver may have, such as for warm initialization, the external interrupt handler function, and any future support for handling external interrupts (beyond IPIs) in M-mode. This improves on the tracking done in fdt_irqchip.c, as it tracks device instances, not just drivers, so callbacks can target a specific device. 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