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lib: Implement sfence.vma correctly.

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Currently, OpenSBI doesn't distinguish between sfence.vma
and sfence.vm asid calls. Moreover, it ignores the page
ranges and just flush entire TLB everytime.

Fix the sfence implementation by keeping all the tlb flush
info in scratch area.

The relevant Linux kernel code was added by
https://patchwork.kernel.org/project/linux-riscv/list/?series=89695

However, this patch is backward compatible with older version kernel
that doesn't have the above patches as well.

Fixes #87
Signed-off-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Atish Patra
2019-03-09 12:57:20 -08:00
committed by Anup Patel
parent 508a27204c
commit 90cb4917b5
6 changed files with 106 additions and 16 deletions
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19
lib/sbi_ecall.c
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@@ -34,6 +34,7 @@ int sbi_ecall_handler(u32 hartid, ulong mcause,
struct sbi_scratch *scratch)
{
int ret = SBI_ENOTSUPP;
struct sbi_tlb_info tlb_info;
switch (regs->a7) {
case SBI_ECALL_SET_TIMER:
@@ -59,16 +60,26 @@ int sbi_ecall_handler(u32 hartid, ulong mcause,
break;
case SBI_ECALL_SEND_IPI:
ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
SBI_IPI_EVENT_SOFT);
SBI_IPI_EVENT_SOFT, NULL);
break;
case SBI_ECALL_REMOTE_FENCE_I:
ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
SBI_IPI_EVENT_FENCE_I);
SBI_IPI_EVENT_FENCE_I, NULL);
break;
case SBI_ECALL_REMOTE_SFENCE_VMA:
case SBI_ECALL_REMOTE_SFENCE_VMA_ASID:
tlb_info.start = (unsigned long)regs->a1;
tlb_info.size = (unsigned long)regs->a2;
ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
SBI_IPI_EVENT_SFENCE_VMA);
SBI_IPI_EVENT_SFENCE_VMA, &tlb_info);
break;
case SBI_ECALL_REMOTE_SFENCE_VMA_ASID:
tlb_info.start = (unsigned long)regs->a1;
tlb_info.size = (unsigned long)regs->a2;
tlb_info.asid = (unsigned long)regs->a3;
ret = sbi_ipi_send_many(scratch, (ulong *)regs->a0,
SBI_IPI_EVENT_SFENCE_VMA_ASID, &tlb_info);
break;
case SBI_ECALL_SHUTDOWN:
sbi_system_shutdown(scratch, 0);