opensbi.git/lib/utils/ipi/aclint_mswi.c, branch master

lib: sbi: Introduce IPI device rating

2025-09-16T04:26:31Z

A platform can have multiple IPI devices (such as ACLINT MSWI, AIA IMSIC, etc). Currently, OpenSBI rely on platform calling the sbi_ipi_set_device() function in correct order and prefer the first avaiable IPI device which is fragile. Instead of the above, introduce IPI device rating and prefer the highest rated IPI device. This further allows extending the sbi_ipi_raw_clear() to clear all available IPI devices. Signed-off-by: Anup Patel Tested-by: Nick Hu Link: https://lore.kernel.org/r/20250904052410.546818-2-apatel@ventanamicro.com Signed-off-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: sbi_ipi: Make .ipi_clear always target the current hart

2024-11-11T12:47:15Z

All existing users of this operation target the current hart, and it seems unlikely that a future user will need to clear the pending IPI status of a remote hart. Simplify the logic by changing .ipi_clear (and its wrapper sbi_ipi_raw_clear()) to always operate on the current hart. This incidentally fixes a bug introduced in commit 78c667b6fc07 ("lib: sbi: Prefer hartindex over hartid in IPI framework"), which changed the .ipi_clear parameter from a hartid to a hart index, but failed to update the warm_init functions to match. Fixes: 78c667b6fc07 ("lib: sbi: Prefer hartindex over hartid in IPI framework") Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: utils/ipi: Use sbi_domain_root_add_memrange() for ACLINT mswi

2024-10-25T17:29:54Z

The sbi_domain_root_add_memrange() should be preferred for creating multiple memregions over a range. Update ACLINT mswi driver to use sbi_domain_root_add_memrange() instead of explicitly registering memregions. Signed-off-by: Anup Patel Reviewed-by: Samuel Holland

lib: utils/ipi: Fix hartid wrongly used as hart index

2024-09-27T05:12:24Z

Since commit 78c667b6fc07 ("lib: sbi: Prefer hartindex over hartid in IPI framework"), The .ipi_clear callback functions take a hart index, not a hartid. However, these warm_init functions were never updated. Fixes: 78c667b6fc07 ("lib: sbi: Prefer hartindex over hartid in IPI framework") Signed-off-by: Samuel Holland Reviewed-by: Anup Patel

lib: sbi: Allow relaxed MMIO writes in device ipi_clear() callback

2023-11-26T13:15:08Z

Currently, there are no barriers before or after the ipi_clear() device callback which forces ipi_clear() device callback to always use non-relaxed MMIO writes. Instead of above, we use wmb() in after the ipi_clear() device callback which pairs with the wmb() done before the ipi_send() device callback. This also allows device ipi_clear() callback to use relaxed MMIO writes. Signed-off-by: Anup Patel Reported-by: Bo Gan

lib: sbi: Allow relaxed MMIO writes in device ipi_send() callback

2023-11-26T13:15:06Z

Currently, we have a smp_wmb() between atomic_raw_set_bit() and ipi_send() device callback whereas the MMIO writes done by the device ipi_send() callback will also include a barrier. We can avoid unnecessary/redundant barriers described above by allowing relaxed MMIO writes in device ipi_send() callback. To achieve this, we simply use wmb() instead of smp_wmb() before calling device ipi_send(). Signed-off-by: Anup Patel Reported-by: Bo Gan

lib: sbi: Prefer hartindex over hartid in IPI framework

2023-09-24T06:09:38Z

Let us prefer hartindex over hartid in IPI framework which in-turn forces IPI users to also prefer hartindex. Signed-off-by: Anup Patel

lib: utils: Fix sbi_hartid_to_scratch() usage in ACLINT drivers

2023-07-09T05:34:57Z

The cold_init() functions of ACLINT drivers should skip the HART if sbi_hartid_to_scratch() returns NULL because we might be dealing with a HART that is disabled in the device tree. Signed-off-by: Anup Patel Reviewed-by: Xiang W

lib: utils/ipi: Use scratch space to save per-HART MSWI pointer

2023-06-05T10:32:59Z

Instead of using a global array indexed by hartid, we should use scratch space to save per-HART MSWI pointer. Signed-off-by: Anup Patel Reviewed-by: Andrew Jones