From: Anup Patel <anup@brainfault.org>
To: Peter Maydell <peter.maydell@linaro.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Alistair Francis <Alistair.Francis@wdc.com>,
Sagar Karandikar <sagark@eecs.berkeley.edu>
Cc: Anup Patel <anup@brainfault.org>, Bin Meng <bmeng.cn@gmail.com>,
qemu-riscv@nongnu.org, qemu-devel@nongnu.org,
Atish Patra <atishp@atishpatra.org>
Subject: [PATCH v6 14/23] target/riscv: Implement AIA xiselect and xireg CSRs
Date: Thu, 30 Dec 2021 18:05:30 +0530 [thread overview]
Message-ID: <20211230123539.52786-15-anup@brainfault.org> (raw)
In-Reply-To: <20211230123539.52786-1-anup@brainfault.org>
From: Anup Patel <anup.patel@wdc.com>
The AIA specification defines [m|s|vs]iselect and [m|s|vs]ireg CSRs
which allow indirect access to interrupt priority arrays and per-HART
IMSIC registers. This patch implements AIA xiselect and xireg CSRs.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
---
target/riscv/cpu.h | 7 ++
target/riscv/csr.c | 175 +++++++++++++++++++++++++++++++++++++++++
target/riscv/machine.c | 3 +
3 files changed, 185 insertions(+)
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 721727c577..82272f99fd 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -186,6 +186,10 @@ struct CPURISCVState {
uint8_t miprio[64];
uint8_t siprio[64];
+ /* AIA CSRs */
+ target_ulong miselect;
+ target_ulong siselect;
+
/* Hypervisor CSRs */
target_ulong hstatus;
target_ulong hedeleg;
@@ -215,6 +219,9 @@ struct CPURISCVState {
target_ulong vstval;
target_ulong vsatp;
+ /* AIA VS-mode CSRs */
+ target_ulong vsiselect;
+
target_ulong mtval2;
target_ulong mtinst;
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 5a27c3bfbb..488877e89c 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -895,6 +895,169 @@ static int read_mtopi(CPURISCVState *env, int csrno, target_ulong *val)
return RISCV_EXCP_NONE;
}
+static int aia_xlate_vs_csrno(CPURISCVState *env, int csrno)
+{
+ if (!riscv_cpu_virt_enabled(env)) {
+ return csrno;
+ }
+
+ switch (csrno) {
+ case CSR_SISELECT:
+ return CSR_VSISELECT;
+ case CSR_SIREG:
+ return CSR_VSIREG;
+ default:
+ return csrno;
+ };
+}
+
+static int rmw_xiselect(CPURISCVState *env, int csrno, target_ulong *val,
+ target_ulong new_val, target_ulong wr_mask)
+{
+ target_ulong *iselect;
+
+ /* Translate CSR number for VS-mode */
+ csrno = aia_xlate_vs_csrno(env, csrno);
+
+ /* Find the iselect CSR based on CSR number */
+ switch (csrno) {
+ case CSR_MISELECT:
+ iselect = &env->miselect;
+ break;
+ case CSR_SISELECT:
+ iselect = &env->siselect;
+ break;
+ case CSR_VSISELECT:
+ iselect = &env->vsiselect;
+ break;
+ default:
+ return RISCV_EXCP_ILLEGAL_INST;
+ };
+
+ if (val) {
+ *val = *iselect;
+ }
+
+ wr_mask &= ISELECT_MASK;
+ if (wr_mask) {
+ *iselect = (*iselect & ~wr_mask) | (new_val & wr_mask);
+ }
+
+ return RISCV_EXCP_NONE;
+}
+
+static int rmw_iprio(target_ulong xlen,
+ target_ulong iselect, uint8_t *iprio,
+ target_ulong *val, target_ulong new_val,
+ target_ulong wr_mask, int ext_irq_no)
+{
+ int i, firq, nirqs;
+ target_ulong old_val;
+
+ if (iselect < ISELECT_IPRIO0 || ISELECT_IPRIO15 < iselect) {
+ return -EINVAL;
+ }
+ if (xlen != 32 && iselect & 0x1) {
+ return -EINVAL;
+ }
+
+ nirqs = 4 * (xlen / 32);
+ firq = ((iselect - ISELECT_IPRIO0) / (xlen / 32)) * (nirqs);
+
+ old_val = 0;
+ for (i = 0; i < nirqs; i++) {
+ old_val |= ((target_ulong)iprio[firq + i]) << (IPRIO_IRQ_BITS * i);
+ }
+
+ if (val) {
+ *val = old_val;
+ }
+
+ if (wr_mask) {
+ new_val = (old_val & ~wr_mask) | (new_val & wr_mask);
+ for (i = 0; i < nirqs; i++) {
+ /*
+ * M-level and S-level external IRQ priority always read-only
+ * zero. This means default priority order is always preferred
+ * for M-level and S-level external IRQs.
+ */
+ if ((firq + i) == ext_irq_no) {
+ continue;
+ }
+ iprio[firq + i] = (new_val >> (IPRIO_IRQ_BITS * i)) & 0xff;
+ }
+ }
+
+ return 0;
+}
+
+static int rmw_xireg(CPURISCVState *env, int csrno, target_ulong *val,
+ target_ulong new_val, target_ulong wr_mask)
+{
+ bool virt;
+ uint8_t *iprio;
+ int ret = -EINVAL;
+ target_ulong priv, isel, vgein;
+
+ /* Translate CSR number for VS-mode */
+ csrno = aia_xlate_vs_csrno(env, csrno);
+
+ /* Decode register details from CSR number */
+ virt = false;
+ switch (csrno) {
+ case CSR_MIREG:
+ iprio = env->miprio;
+ isel = env->miselect;
+ priv = PRV_M;
+ break;
+ case CSR_SIREG:
+ iprio = env->siprio;
+ isel = env->siselect;
+ priv = PRV_S;
+ break;
+ case CSR_VSIREG:
+ iprio = env->hviprio;
+ isel = env->vsiselect;
+ priv = PRV_S;
+ virt = true;
+ break;
+ default:
+ goto done;
+ };
+
+ /* Find the selected guest interrupt file */
+ vgein = (virt) ? get_field(env->hstatus, HSTATUS_VGEIN) : 0;
+
+ if (ISELECT_IPRIO0 <= isel && isel <= ISELECT_IPRIO15) {
+ /* Local interrupt priority registers not available for VS-mode */
+ if (!virt) {
+ ret = rmw_iprio(riscv_cpu_mxl_bits(env),
+ isel, iprio, val, new_val, wr_mask,
+ (priv == PRV_M) ? IRQ_M_EXT : IRQ_S_EXT);
+ }
+ } else if (ISELECT_IMSIC_FIRST <= isel && isel <= ISELECT_IMSIC_LAST) {
+ /* IMSIC registers only available when machine implements it. */
+ if (env->aia_ireg_rmw_fn[priv]) {
+ /* Selected guest interrupt file should not be zero */
+ if (virt && (!vgein || env->geilen < vgein)) {
+ goto done;
+ }
+ /* Call machine specific IMSIC register emulation */
+ ret = env->aia_ireg_rmw_fn[priv](env->aia_ireg_rmw_fn_arg[priv],
+ AIA_MAKE_IREG(isel, priv, virt, vgein,
+ riscv_cpu_mxl_bits(env)),
+ val, new_val, wr_mask);
+ }
+ }
+
+done:
+ if (ret) {
+ return (riscv_cpu_virt_enabled(env) && virt) ?
+ RISCV_EXCP_VIRT_INSTRUCTION_FAULT : RISCV_EXCP_ILLEGAL_INST;
+ }
+ return RISCV_EXCP_NONE;
+}
+
static RISCVException read_mtvec(CPURISCVState *env, int csrno,
target_ulong *val)
{
@@ -2536,6 +2699,10 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
[CSR_MTVAL] = { "mtval", any, read_mtval, write_mtval },
[CSR_MIP] = { "mip", any, NULL, NULL, rmw_mip },
+ /* Machine-Level Window to Indirectly Accessed Registers (AIA) */
+ [CSR_MISELECT] = { "miselect", aia_any, NULL, NULL, rmw_xiselect },
+ [CSR_MIREG] = { "mireg", aia_any, NULL, NULL, rmw_xireg },
+
/* Machine-Level Interrupts (AIA) */
[CSR_MTOPI] = { "mtopi", aia_any, read_mtopi },
@@ -2566,6 +2733,10 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
/* Supervisor Protection and Translation */
[CSR_SATP] = { "satp", smode, read_satp, write_satp },
+ /* Supervisor-Level Window to Indirectly Accessed Registers (AIA) */
+ [CSR_SISELECT] = { "siselect", aia_smode, NULL, NULL, rmw_xiselect },
+ [CSR_SIREG] = { "sireg", aia_smode, NULL, NULL, rmw_xireg },
+
/* Supervisor-Level Interrupts (AIA) */
[CSR_STOPI] = { "stopi", aia_smode, read_stopi },
@@ -2607,6 +2778,10 @@ riscv_csr_operations csr_ops[CSR_TABLE_SIZE] = {
[CSR_HVIPRIO1] = { "hviprio1", aia_hmode, read_hviprio1, write_hviprio1 },
[CSR_HVIPRIO2] = { "hviprio2", aia_hmode, read_hviprio2, write_hviprio2 },
+ /* VS-Level Window to Indirectly Accessed Registers (H-extension with AIA) */
+ [CSR_VSISELECT] = { "vsiselect", aia_hmode, NULL, NULL, rmw_xiselect },
+ [CSR_VSIREG] = { "vsireg", aia_hmode, NULL, NULL, rmw_xireg },
+
/* VS-Level Interrupts (H-extension with AIA) */
[CSR_VSTOPI] = { "vstopi", aia_hmode, read_vstopi },
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index f027d5e307..376a02a36f 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -103,6 +103,7 @@ static const VMStateDescription vmstate_hyper = {
VMSTATE_UINTTL(env.vscause, RISCVCPU),
VMSTATE_UINTTL(env.vstval, RISCVCPU),
VMSTATE_UINTTL(env.vsatp, RISCVCPU),
+ VMSTATE_UINTTL(env.vsiselect, RISCVCPU),
VMSTATE_UINTTL(env.mtval2, RISCVCPU),
VMSTATE_UINTTL(env.mtinst, RISCVCPU),
@@ -210,6 +211,8 @@ const VMStateDescription vmstate_riscv_cpu = {
VMSTATE_UINTTL(env.mepc, RISCVCPU),
VMSTATE_UINTTL(env.mcause, RISCVCPU),
VMSTATE_UINTTL(env.mtval, RISCVCPU),
+ VMSTATE_UINTTL(env.miselect, RISCVCPU),
+ VMSTATE_UINTTL(env.siselect, RISCVCPU),
VMSTATE_UINTTL(env.scounteren, RISCVCPU),
VMSTATE_UINTTL(env.mcounteren, RISCVCPU),
VMSTATE_UINTTL(env.sscratch, RISCVCPU),
--
2.25.1
next prev parent reply other threads:[~2021-12-30 12:52 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-30 12:35 [PATCH v6 00/23] QEMU RISC-V AIA support Anup Patel
2021-12-30 12:35 ` [PATCH v6 01/23] target/riscv: Fix trap cause for RV32 HS-mode CSR access from RV64 HS-mode Anup Patel
2022-01-12 12:29 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 02/23] target/riscv: Implement SGEIP bit in hip and hie CSRs Anup Patel
2022-01-13 14:35 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 03/23] target/riscv: Implement hgeie and hgeip CSRs Anup Patel
2022-01-14 6:37 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 04/23] target/riscv: Improve delivery of guest external interrupts Anup Patel
2022-01-13 7:51 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 05/23] target/riscv: Allow setting CPU feature from machine/device emulation Anup Patel
2022-01-12 12:34 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 06/23] target/riscv: Add AIA cpu feature Anup Patel
2022-01-12 12:34 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 07/23] target/riscv: Add defines for AIA CSRs Anup Patel
2022-01-12 12:57 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 08/23] target/riscv: Allow AIA device emulation to set ireg rmw callback Anup Patel
2022-01-12 12:59 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 09/23] target/riscv: Implement AIA local interrupt priorities Anup Patel
2022-01-10 13:08 ` Frank Chang
2022-01-11 17:18 ` Anup Patel
2022-01-12 3:00 ` Frank Chang
2022-01-13 10:45 ` Anup Patel
2022-01-13 14:21 ` Frank Chang
2022-01-10 13:25 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 10/23] target/riscv: Implement AIA CSRs for 64 local interrupts on RV32 Anup Patel
2022-01-14 9:48 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 11/23] target/riscv: Implement AIA hvictl and hviprioX CSRs Anup Patel
2022-01-12 13:15 ` Frank Chang
2022-01-13 10:49 ` Anup Patel
2021-12-30 12:35 ` [PATCH v6 12/23] target/riscv: Implement AIA interrupt filtering CSRs Anup Patel
2022-01-11 6:00 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 13/23] target/riscv: Implement AIA mtopi, stopi, and vstopi CSRs Anup Patel
2022-01-12 12:15 ` Frank Chang
2022-01-13 10:48 ` Anup Patel
2021-12-30 12:35 ` Anup Patel [this message]
2022-01-12 16:40 ` [PATCH v6 14/23] target/riscv: Implement AIA xiselect and xireg CSRs Frank Chang
2021-12-30 12:35 ` [PATCH v6 15/23] target/riscv: Implement AIA IMSIC interface CSRs Anup Patel
2022-01-05 3:30 ` Frank Chang
2022-01-08 12:03 ` Anup Patel
2021-12-30 12:35 ` [PATCH v6 16/23] hw/riscv: virt: Use AIA INTC compatible string when available Anup Patel
2022-01-12 16:47 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 17/23] target/riscv: Allow users to force enable AIA CSRs in HART Anup Patel
2022-01-12 13:19 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 18/23] hw/intc: Add RISC-V AIA APLIC device emulation Anup Patel
2022-01-07 8:52 ` Frank Chang
2022-01-08 13:28 ` Anup Patel
2022-01-08 6:35 ` Frank Chang
2022-01-08 12:00 ` Anup Patel
2022-01-14 12:02 ` Frank Chang
2022-01-14 12:59 ` Anup Patel
2021-12-30 12:35 ` [PATCH v6 19/23] hw/riscv: virt: Add optional AIA APLIC support to virt machine Anup Patel
2021-12-30 12:35 ` [PATCH v6 20/23] hw/intc: Add RISC-V AIA IMSIC device emulation Anup Patel
2022-01-13 7:26 ` Frank Chang
2022-01-13 12:22 ` Anup Patel
2021-12-30 12:35 ` [PATCH v6 21/23] hw/riscv: virt: Add optional AIA IMSIC support to virt machine Anup Patel
2021-12-30 12:35 ` [PATCH v6 22/23] docs/system: riscv: Document AIA options for " Anup Patel
2022-01-12 13:23 ` Frank Chang
2021-12-30 12:35 ` [PATCH v6 23/23] hw/riscv: virt: Increase maximum number of allowed CPUs Anup Patel
2022-01-05 21:50 ` Alistair Francis
2022-01-12 13:26 ` Frank Chang
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