forked from Qortal/Brooklyn
7d3018da4c
* NVME, SATA NAND Security added * Qortal Core exception fetcher is now redone. * Update DT overlays for firmware * Fix for bvb clockj settings * Fix for no audio for sissy desktop porn watchers -_- ( thanks crowetic for watching gay porn and reporting me that bug asshat ) * Normalize the fetch() stream while doing a peer to peer handshake for nodes * Fix for RNG token editing error while performing a SHA256 encryption * Now under voltage errors will blink red led constantly for 5 minutes then go solid. * Improve kernel thread scaling for Qortal 2.0 core * HDMI circuit is now enabled at power up instead. * Added KMS * Added line replication instead of interpolation for VC4 GPU resulting in slightly better frame rates * Fix for long and doubles * Backplane clock is now set at standard rate * Capped HVEC clocks * Add support for Creative Cinema webcam for donkers who like sharing dick pics. *looks at crowetic* * More scanline XGA modes for people who have weird ass monitors of all sorts. * TX/RX flow control support is now 100% stable. No lags over 1Gbps ethernet. ( Hello Qortal 3.0 ) * Using flush cache instead of fetch for QC 2.0 resulting in performance gains * VC4 clock is now enforced for desktop oriented images. * Ondemand governor now waits for 2 seconds instead of 0.5ms to scale down to the lowest safest clock freq preventing lags to the core. * Timeout of OC set at 35ms from 90ms resulting in way better clocks and sync for Qortal 2.0 core
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2017 SiFive
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*/
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#include <asm/cacheflush.h>
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#ifdef CONFIG_SMP
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#include <asm/sbi.h>
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static void ipi_remote_fence_i(void *info)
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{
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return local_flush_icache_all();
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}
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void flush_icache_all(void)
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{
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local_flush_icache_all();
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if (IS_ENABLED(CONFIG_RISCV_SBI))
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sbi_remote_fence_i(NULL);
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else
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on_each_cpu(ipi_remote_fence_i, NULL, 1);
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}
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EXPORT_SYMBOL(flush_icache_all);
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/*
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* Performs an icache flush for the given MM context. RISC-V has no direct
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* mechanism for instruction cache shoot downs, so instead we send an IPI that
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* informs the remote harts they need to flush their local instruction caches.
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* To avoid pathologically slow behavior in a common case (a bunch of
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* single-hart processes on a many-hart machine, ie 'make -j') we avoid the
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* IPIs for harts that are not currently executing a MM context and instead
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* schedule a deferred local instruction cache flush to be performed before
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* execution resumes on each hart.
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*/
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void flush_icache_mm(struct mm_struct *mm, bool local)
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{
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unsigned int cpu;
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cpumask_t others, *mask;
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preempt_disable();
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/* Mark every hart's icache as needing a flush for this MM. */
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mask = &mm->context.icache_stale_mask;
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cpumask_setall(mask);
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/* Flush this hart's I$ now, and mark it as flushed. */
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cpu = smp_processor_id();
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cpumask_clear_cpu(cpu, mask);
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local_flush_icache_all();
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/*
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* Flush the I$ of other harts concurrently executing, and mark them as
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* flushed.
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*/
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cpumask_andnot(&others, mm_cpumask(mm), cpumask_of(cpu));
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local |= cpumask_empty(&others);
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if (mm == current->active_mm && local) {
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/*
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* It's assumed that at least one strongly ordered operation is
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* performed on this hart between setting a hart's cpumask bit
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* and scheduling this MM context on that hart. Sending an SBI
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* remote message will do this, but in the case where no
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* messages are sent we still need to order this hart's writes
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* with flush_icache_deferred().
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*/
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smp_mb();
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} else if (IS_ENABLED(CONFIG_RISCV_SBI)) {
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cpumask_t hartid_mask;
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riscv_cpuid_to_hartid_mask(&others, &hartid_mask);
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sbi_remote_fence_i(cpumask_bits(&hartid_mask));
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} else {
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on_each_cpu_mask(&others, ipi_remote_fence_i, NULL, 1);
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}
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preempt_enable();
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}
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_MMU
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void flush_icache_pte(pte_t pte)
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{
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struct page *page = pte_page(pte);
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if (!test_and_set_bit(PG_dcache_clean, &page->flags))
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flush_icache_all();
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}
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#endif /* CONFIG_MMU */
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