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Message-ID: <88516ae4d03cd37033957f7ddd9707aa4a3cce65.1724453781.git.nicolinc@nvidia.com>
Date: Fri, 23 Aug 2024 17:10:44 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>
CC: <robin.murphy@....com>, <joro@...tes.org>, <jgg@...dia.com>,
<thierry.reding@...il.com>, <vdumpa@...dia.com>, <jonathanh@...dia.com>,
<linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>
Subject: [PATCH v13 10/10] iommu/tegra241-cmdqv: Limit CMDs for VCMDQs of a guest owned VINTF
When VCMDQs are assigned to a VINTF owned by a guest (HYP_OWN bit unset),
only TLB and ATC invalidation commands are supported by the VCMDQ HW. So,
implement the new cmdq->supports_cmd op to scan the input cmd in order to
make sure that it is supported by the selected queue.
Note that the guest VM shouldn't have HYP_OWN bit being set regardless of
guest kernel driver writing it or not, i.e. the hypervisor running in the
host OS should wire this bit to zero when trapping a write access to this
VINTF_CONFIG register from a guest kernel.
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 28 ++++++++-------
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 3 +-
.../iommu/arm/arm-smmu-v3/tegra241-cmdqv.c | 34 ++++++++++++++++++-
3 files changed, 51 insertions(+), 14 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 40dc5b9afa00..7e4359181094 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -346,12 +346,13 @@ static int arm_smmu_cmdq_build_cmd(u64 *cmd, struct arm_smmu_cmdq_ent *ent)
return 0;
}
-static struct arm_smmu_cmdq *arm_smmu_get_cmdq(struct arm_smmu_device *smmu)
+static struct arm_smmu_cmdq *arm_smmu_get_cmdq(struct arm_smmu_device *smmu,
+ struct arm_smmu_cmdq_ent *ent)
{
struct arm_smmu_cmdq *cmdq = NULL;
if (smmu->impl_ops && smmu->impl_ops->get_secondary_cmdq)
- cmdq = smmu->impl_ops->get_secondary_cmdq(smmu);
+ cmdq = smmu->impl_ops->get_secondary_cmdq(smmu, ent);
return cmdq ?: &smmu->cmdq;
}
@@ -897,7 +898,7 @@ static int __arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu,
}
return arm_smmu_cmdq_issue_cmdlist(
- smmu, arm_smmu_get_cmdq(smmu), cmd, 1, sync);
+ smmu, arm_smmu_get_cmdq(smmu, ent), cmd, 1, sync);
}
static int arm_smmu_cmdq_issue_cmd(struct arm_smmu_device *smmu,
@@ -913,10 +914,11 @@ static int arm_smmu_cmdq_issue_cmd_with_sync(struct arm_smmu_device *smmu,
}
static void arm_smmu_cmdq_batch_init(struct arm_smmu_device *smmu,
- struct arm_smmu_cmdq_batch *cmds)
+ struct arm_smmu_cmdq_batch *cmds,
+ struct arm_smmu_cmdq_ent *ent)
{
cmds->num = 0;
- cmds->cmdq = arm_smmu_get_cmdq(smmu);
+ cmds->cmdq = arm_smmu_get_cmdq(smmu, ent);
}
static void arm_smmu_cmdq_batch_add(struct arm_smmu_device *smmu,
@@ -931,13 +933,13 @@ static void arm_smmu_cmdq_batch_add(struct arm_smmu_device *smmu,
if (force_sync || unsupported_cmd) {
arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmdq, cmds->cmds,
cmds->num, true);
- arm_smmu_cmdq_batch_init(smmu, cmds);
+ arm_smmu_cmdq_batch_init(smmu, cmds, cmd);
}
if (cmds->num == CMDQ_BATCH_ENTRIES) {
arm_smmu_cmdq_issue_cmdlist(smmu, cmds->cmdq, cmds->cmds,
cmds->num, false);
- arm_smmu_cmdq_batch_init(smmu, cmds);
+ arm_smmu_cmdq_batch_init(smmu, cmds, cmd);
}
index = cmds->num * CMDQ_ENT_DWORDS;
@@ -1205,7 +1207,7 @@ static void arm_smmu_sync_cd(struct arm_smmu_master *master,
},
};
- arm_smmu_cmdq_batch_init(smmu, &cmds);
+ arm_smmu_cmdq_batch_init(smmu, &cmds, &cmd);
for (i = 0; i < master->num_streams; i++) {
cmd.cfgi.sid = master->streams[i].id;
arm_smmu_cmdq_batch_add(smmu, &cmds, &cmd);
@@ -2056,7 +2058,7 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master,
arm_smmu_atc_inv_to_cmd(ssid, 0, 0, &cmd);
- arm_smmu_cmdq_batch_init(master->smmu, &cmds);
+ arm_smmu_cmdq_batch_init(master->smmu, &cmds, &cmd);
for (i = 0; i < master->num_streams; i++) {
cmd.atc.sid = master->streams[i].id;
arm_smmu_cmdq_batch_add(master->smmu, &cmds, &cmd);
@@ -2071,7 +2073,9 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
struct arm_smmu_master_domain *master_domain;
int i;
unsigned long flags;
- struct arm_smmu_cmdq_ent cmd;
+ struct arm_smmu_cmdq_ent cmd = {
+ .opcode = CMDQ_OP_ATC_INV,
+ };
struct arm_smmu_cmdq_batch cmds;
if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_ATS))
@@ -2094,7 +2098,7 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
if (!atomic_read(&smmu_domain->nr_ats_masters))
return 0;
- arm_smmu_cmdq_batch_init(smmu_domain->smmu, &cmds);
+ arm_smmu_cmdq_batch_init(smmu_domain->smmu, &cmds, &cmd);
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
list_for_each_entry(master_domain, &smmu_domain->devices,
@@ -2176,7 +2180,7 @@ static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
num_pages++;
}
- arm_smmu_cmdq_batch_init(smmu, &cmds);
+ arm_smmu_cmdq_batch_init(smmu, &cmds, cmd);
while (iova < end) {
if (smmu->features & ARM_SMMU_FEAT_RANGE_INV) {
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index d4e5a22408e3..003330b23946 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -642,7 +642,8 @@ struct arm_smmu_strtab_cfg {
struct arm_smmu_impl_ops {
int (*device_reset)(struct arm_smmu_device *smmu);
void (*device_remove)(struct arm_smmu_device *smmu);
- struct arm_smmu_cmdq *(*get_secondary_cmdq)(struct arm_smmu_device *smmu);
+ struct arm_smmu_cmdq *(*get_secondary_cmdq)(
+ struct arm_smmu_device *smmu, struct arm_smmu_cmdq_ent *ent);
};
/* An SMMUv3 instance */
diff --git a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
index b794a4dcbce1..1846bbd0df59 100644
--- a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
+++ b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
@@ -142,6 +142,7 @@ struct tegra241_vcmdq {
* struct tegra241_vintf - Virtual Interface
* @idx: Global index in the CMDQV
* @enabled: Enable status
+ * @hyp_own: Owned by hypervisor (in-kernel)
* @cmdqv: Parent CMDQV pointer
* @lvcmdqs: List of logical VCMDQ pointers
* @base: MMIO base address
@@ -150,6 +151,7 @@ struct tegra241_vintf {
u16 idx;
bool enabled;
+ bool hyp_own;
struct tegra241_cmdqv *cmdqv;
struct tegra241_vcmdq **lvcmdqs;
@@ -300,8 +302,21 @@ static irqreturn_t tegra241_cmdqv_isr(int irq, void *devid)
/* Command Queue Function */
+static bool tegra241_guest_vcmdq_supports_cmd(struct arm_smmu_cmdq_ent *ent)
+{
+ switch (ent->opcode) {
+ case CMDQ_OP_TLBI_NH_ASID:
+ case CMDQ_OP_TLBI_NH_VA:
+ case CMDQ_OP_ATC_INV:
+ return true;
+ default:
+ return false;
+ }
+}
+
static struct arm_smmu_cmdq *
-tegra241_cmdqv_get_cmdq(struct arm_smmu_device *smmu)
+tegra241_cmdqv_get_cmdq(struct arm_smmu_device *smmu,
+ struct arm_smmu_cmdq_ent *ent)
{
struct tegra241_cmdqv *cmdqv =
container_of(smmu, struct tegra241_cmdqv, smmu);
@@ -327,6 +342,10 @@ tegra241_cmdqv_get_cmdq(struct arm_smmu_device *smmu)
vcmdq = vintf->lvcmdqs[lidx];
if (!vcmdq || !READ_ONCE(vcmdq->enabled))
return NULL;
+
+ /* Unsupported CMD goes for smmu->cmdq pathway */
+ if (!arm_smmu_cmdq_supports_cmd(&vcmdq->cmdq, ent))
+ return NULL;
return &vcmdq->cmdq;
}
@@ -405,12 +424,22 @@ static int tegra241_vintf_hw_init(struct tegra241_vintf *vintf, bool hyp_own)
tegra241_vintf_hw_deinit(vintf);
/* Configure and enable VINTF */
+ /*
+ * Note that HYP_OWN bit is wired to zero when running in guest kernel,
+ * whether enabling it here or not, as !HYP_OWN cmdq HWs only support a
+ * restricted set of supported commands.
+ */
regval = FIELD_PREP(VINTF_HYP_OWN, hyp_own);
writel(regval, REG_VINTF(vintf, CONFIG));
ret = vintf_write_config(vintf, regval | VINTF_EN);
if (ret)
return ret;
+ /*
+ * As being mentioned above, HYP_OWN bit is wired to zero for a guest
+ * kernel, so read it back from HW to ensure that reflects in hyp_own
+ */
+ vintf->hyp_own = !!(VINTF_HYP_OWN & readl(REG_VINTF(vintf, CONFIG)));
for (lidx = 0; lidx < vintf->cmdqv->num_lvcmdqs_per_vintf; lidx++) {
if (vintf->lvcmdqs && vintf->lvcmdqs[lidx]) {
@@ -492,6 +521,9 @@ static int tegra241_vcmdq_alloc_smmu_cmdq(struct tegra241_vcmdq *vcmdq)
q->q_base = q->base_dma & VCMDQ_ADDR;
q->q_base |= FIELD_PREP(VCMDQ_LOG2SIZE, q->llq.max_n_shift);
+ if (!vcmdq->vintf->hyp_own)
+ cmdq->supports_cmd = tegra241_guest_vcmdq_supports_cmd;
+
return arm_smmu_cmdq_init(smmu, cmdq);
}
--
2.43.0
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