[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20240321085041.1955293-3-apatel@ventanamicro.com>
Date: Thu, 21 Mar 2024 14:20:41 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
Atish Patra <atishp@...shpatra.org>
Cc: Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Andrew Jones <ajones@...tanamicro.com>,
Anup Patel <anup@...infault.org>,
kvm@...r.kernel.org,
kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 2/2] RISC-V: KVM: Fix APLIC in_clrip[x] read emulation
The reads to APLIC in_clrip[x] registers returns rectified input values
of the interrupt sources.
A rectified input value of an interrupt source is defined by the section
"4.5.2 Source configurations (sourcecfg[1]–sourcecfg[1023])" of the
RISC-V AIA specification as:
rectified input value = (incoming wire value) XOR (source is inverted)
Update the riscv_aplic_input() implementation to match the above.
Fixes: 74967aa208e2 ("RISC-V: KVM: Add in-kernel emulation of AIA APLIC")
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
arch/riscv/kvm/aia_aplic.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/kvm/aia_aplic.c b/arch/riscv/kvm/aia_aplic.c
index 5e842b92dc46..b467ba5ed910 100644
--- a/arch/riscv/kvm/aia_aplic.c
+++ b/arch/riscv/kvm/aia_aplic.c
@@ -197,16 +197,31 @@ static void aplic_write_enabled(struct aplic *aplic, u32 irq, bool enabled)
static bool aplic_read_input(struct aplic *aplic, u32 irq)
{
- bool ret;
- unsigned long flags;
+ u32 sourcecfg, sm, raw_input, irq_inverted;
struct aplic_irq *irqd;
+ unsigned long flags;
+ bool ret = false;
if (!irq || aplic->nr_irqs <= irq)
return false;
irqd = &aplic->irqs[irq];
raw_spin_lock_irqsave(&irqd->lock, flags);
- ret = (irqd->state & APLIC_IRQ_STATE_INPUT) ? true : false;
+
+ sourcecfg = irqd->sourcecfg;
+ if (sourcecfg & APLIC_SOURCECFG_D)
+ goto skip;
+
+ sm = sourcecfg & APLIC_SOURCECFG_SM_MASK;
+ if (sm == APLIC_SOURCECFG_SM_INACTIVE)
+ goto skip;
+
+ raw_input = (irqd->state & APLIC_IRQ_STATE_INPUT) ? 1 : 0;
+ irq_inverted = (sm == APLIC_SOURCECFG_SM_LEVEL_LOW ||
+ sm == APLIC_SOURCECFG_SM_EDGE_FALL) ? 1 : 0;
+ ret = !!(raw_input ^ irq_inverted);
+
+skip:
raw_spin_unlock_irqrestore(&irqd->lock, flags);
return ret;
--
2.34.1
Powered by blists - more mailing lists