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Add a fix for TLB flush

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Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>
This commit is contained in:
David Abdurachmanov 2019-08-25 02:06:56 -07:00
parent 1eeb636d12
commit 61f194cc7d
Signed by: davidlt
GPG Key ID: 8B7F1DA0E2C9FDBB
2 changed files with 86 additions and 2 deletions
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80
0001-riscv-optimize-tlb-flush-path.patch Normal file
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@ -0,0 +1,80 @@
From e168a466bde2761439bfae6ba78d7321a9a3af58 Mon Sep 17 00:00:00 2001
From: Fedora Kernel Team <kernel-team@fedoraproject.org>
Date: Sun, 25 Aug 2019 09:04:31 +0000
Subject: [PATCH] riscv: optimize tlb flush path
diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h
index 4d9bbe8..d669d87 100644
--- a/arch/riscv/include/asm/tlbflush.h
+++ b/arch/riscv/include/asm/tlbflush.h
@@ -8,6 +8,7 @@
#define _ASM_RISCV_TLBFLUSH_H
#include <linux/mm_types.h>
+#include <linux/sched.h>
#include <asm/smp.h>
/*
@@ -42,20 +43,44 @@ static inline void flush_tlb_range(struct vm_area_struct *vma,
#include <asm/sbi.h>
-static inline void remote_sfence_vma(struct cpumask *cmask, unsigned long start,
- unsigned long size)
+static void __riscv_flush_tlb(struct cpumask *cmask, unsigned long start,
+ unsigned long size)
{
struct cpumask hmask;
+ unsigned int hartid;
+ unsigned int cpuid;
cpumask_clear(&hmask);
+
+ if (!cmask) {
+ riscv_cpuid_to_hartid_mask(cpu_online_mask, &hmask);
+ goto issue_sfence;
+ }
+
+ cpuid = get_cpu();
+ if (cpumask_test_cpu(cpuid, cmask)) {
+ /* Save trap cost by issuing a local tlb flush here */
+ if ((start == 0 && size == -1) || (size > PAGE_SIZE))
+ local_flush_tlb_all();
+ else if (size == PAGE_SIZE)
+ local_flush_tlb_page(start);
+ }
+ if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids)
+ goto done;
+
riscv_cpuid_to_hartid_mask(cmask, &hmask);
+ hartid = cpuid_to_hartid_map(cpuid);
+ cpumask_clear_cpu(hartid, &hmask);
+
+issue_sfence:
sbi_remote_sfence_vma(hmask.bits, start, size);
+done:
+ put_cpu();
}
-#define flush_tlb_all() sbi_remote_sfence_vma(NULL, 0, -1)
-
+#define flush_tlb_all() __riscv_flush_tlb(NULL, 0, -1)
#define flush_tlb_range(vma, start, end) \
- remote_sfence_vma(mm_cpumask((vma)->vm_mm), start, (end) - (start))
+ __riscv_flush_tlb(mm_cpumask((vma)->vm_mm), start, (end) - (start))
static inline void flush_tlb_page(struct vm_area_struct *vma,
unsigned long addr)
@@ -64,7 +89,7 @@ static inline void flush_tlb_page(struct vm_area_struct *vma,
}
#define flush_tlb_mm(mm) \
- remote_sfence_vma(mm_cpumask(mm), 0, -1)
+ __riscv_flush_tlb(mm_cpumask(mm), 0, -1)
#endif /* CONFIG_SMP */
--
2.23.0

8
kernel.spec
View File

@ -144,7 +144,7 @@ Summary: The Linux kernel
# pkg_release is what we'll fill in for the rpm Release: field
%if 0%{?released_kernel}
%define pkg_release %{fedora_build}%{?buildid}.0.riscv64%{?dist}
%define pkg_release %{fedora_build}%{?buildid}.1.riscv64%{?dist}
%else
@ -159,7 +159,7 @@ Summary: The Linux kernel
%else
%define gittag .git0
%endif
%define pkg_release 0%{?rctag}%{?gittag}.%{fedora_build}%{?buildid}.0.riscv64%{?dist}
%define pkg_release 0%{?rctag}%{?gittag}.%{fedora_build}%{?buildid}.1.riscv64%{?dist}
%endif
@ -606,6 +606,10 @@ Patch551: 0001-SiFive-Unleashed-Ethernet.patch
# https://github.com/sifive/riscv-linux/commits/dev/paulw/cpufreq-dt-aloe-v5.3-rc4
Patch552: 0002-SiFive-Unleashed-CPUFreq.patch
# RISC-V Fix TLB Flush issue
# Not upstreamed, but posted
Patch553: 0001-riscv-optimize-tlb-flush-path.patch
# END OF PATCH DEFINITIONS
%endif