opensbi.git/include/sbi/sbi_platform.h, branch v0.7

include: sbi_platform: Remove priv parameter from hart_start() callback

2020-03-28T08:02:26Z

The priv parameter in hart_start() platform callback is redundant hence we remove it. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: sbi_platform: Introduce HART index to HART id table

2020-03-19T04:00:01Z

A platform can have discontinuous and/or sparse HART ids so we cannot always assume a set of HARTs with continuous HART ids. This patch adds support for discontinuous and sparse HART ids by introducing HART index to HART id table. This table has platform hart_count entries and it maps HART index to HART id. The HART index to HART id table has only two restrictions: 1. HART index < sbi_platform hart_count 2. HART id < SBI_HARTMASK_MAX_BITS Example1: Let's say we have a platform with 2 HART ids 11 and 22, for such a a platform: hart_count = 2 hart_index2id[0] = 11 hart_index2id[1] = 22 Example2: Let's say we have a platform with 5 HARTs ids 0, 1, 2, 3, and 4 but out of these HART with id 0 is not usable so for such a platform: hart_count = 5 hart_index2id[0] = -1U hart_index2id[1] = 1 hart_index2id[2] = 2 hart_index2id[3] = 3 hart_index2id[4] = 4 OR hart_count = 4 hart_index2id[0] = 1 hart_index2id[1] = 2 hart_index2id[2] = 3 hart_index2id[3] = 4 With HART index to HART id table in place, the hart_disabled() callback is now redundant so we remove it as well. Signed-off-by: Anup Patel Reviewed-by: Bin Meng Reviewed-by: Atish Patra

include: sbi_platform: Improve sbi_platform_hart_disabled() API

2020-03-19T03:45:29Z

The sbi_platform_hart_disabled() should return TRUE for HART id greater than platform hart count. Signed-off-by: Anup Patel Reviewed-by: Bin Meng

platform: Use one unified per-HART stack size macro for all platforms

2020-03-14T03:44:00Z

As of today all platforms use 8KB of per-HART stack hence there is no need for each platform to define its own macro or use the magic number. Create one macro for all platforms. Platform still can use its own version if needed. Signed-off-by: Bin Meng Reviewed-by: Anup Patel

include: Remove disabled_hart_mask from sbi_platform

2020-03-11T10:00:12Z

The disabled_hard_mask in sbi_platform is only 64bits wide so we cannot disable a HART with HARTID > 63. To tackle this, we remove disabled_hart_mask and replace it with hart_disabled() platform callback. Signed-off-by: Anup Patel Reviewed-by: Bin Meng Reviewed-by: Atish Patra

lib: sbi: Fix coding style issues

2020-03-10T04:57:28Z

This fixes various coding style issues found in the SBI codes. No functional changes. Signed-off-by: Bin Meng Reviewed-by: Anup Patel

lib: Implement hart hotplug

2020-02-24T12:37:55Z

This patch adds support for hart hotplug in OpenSBI using a generic WFI based approach. Hart hotplug can be achieved via SBI HSM extension which allows supervisor mode software to start or stop any harts anytime. Any platform wishes to implement platform specific hart hotplug must implement both hart_start and hart_stop in addition to enable platform feature SBI_PLATFORM_HAS_HART_HOTPLUG. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: Add a new platform feature to bringup secondary harts

2020-02-24T12:34:23Z

A platform may have a specific method to bring-up secondary harts for the first time but may rely on generic WFI based approach for hart hotplug in absence of a platform specific hart hotplug method. Define a platform feature flag for such platforms. The platform needs to implement platform specific bring-up method in hart_start and not define hart_stop method in this case. They must only define SBI_PLATFORM_HAS_HART_SECONDARY_BOOT. SBI_PLATFORM_HAS_HART_HOTPLUG should only be defined when the platform intend to support both hart_start and hart_stop and do not intend to rely on generic WFI based approach. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

platform: Add an platform ops to return platform specific tlb flush limit

2020-02-05T05:07:11Z

If a platform requires to perform a tlb full flush, they should set the tlb_range_flush_limit value to zero. However, corresponding platform API ignore the value and continue to return the default value. Add a platform ops to retrieve platform specific tlb range flush limit. The platform variable becomes redundant in presence of the platform ops. Take this opportunity to remove the variable as well. The default is still set to smallest page size in RISC-V (4KB), as there is no way to figure out a best value for all platforms. Individual platform should set it to the optimal value for their platform. Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: Add irqchip exit API

2020-01-07T06:41:19Z

We add an optional platform irqchip exit hook for exit path handling in sbi_exit() implementation. Signed-off-by: Anup Patel Reviewed-by: Atish Patra