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iommu/tegra241-cmdqv: Set supports_cmd op in tegra241_vcmdq_hw_init()

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vintf->hyp_own is finalized in tegra241_vintf_hw_init(). On the other hand,
tegra241_vcmdq_alloc_smmu_cmdq() is called via an init_structures callback,
which is earlier than tegra241_vintf_hw_init().

This results in the supports_cmd op always being set to the guest function,
although this doesn't break any functionality nor have some noticeable perf
impact since non-invalidation commands are not issued in the perf sensitive
context.

Fix this by moving supports_cmd to tegra241_vcmdq_hw_init().

After this change,
 - For a guest kernel, this will be a status quo
 - For a host kernel, non-invalidation commands will be issued to VCMDQ(s)

Fixes: a9d40285bd ("iommu/tegra241-cmdqv: Limit CMDs for VCMDQs of a guest owned VINTF")
Reported-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Shameer Kolothum <skolothumtho@nvidia.com>
Closes: https://lore.kernel.org/qemu-devel/CH3PR12MB754836BEE54E39B30C7210C0AB44A@CH3PR12MB7548.namprd12.prod.outlook.com/
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Shameer Kolothum <skolothumtho@nvidia.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Nicolin Chen
2026-03-12 17:36:34 -07:00
committed by Will Deacon
parent 3b79398383
commit 803e41f36d
1 changed files with 4 additions and 3 deletions
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7
drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
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@@ -479,6 +479,10 @@ static int tegra241_vcmdq_hw_init(struct tegra241_vcmdq *vcmdq)
/* Reset VCMDQ */
tegra241_vcmdq_hw_deinit(vcmdq);
/* vintf->hyp_own is a HW state finalized in tegra241_vintf_hw_init() */
if (!vcmdq->vintf->hyp_own)
vcmdq->cmdq.supports_cmd = tegra241_guest_vcmdq_supports_cmd;
/* Configure and enable VCMDQ */
writeq_relaxed(vcmdq->cmdq.q.q_base, REG_VCMDQ_PAGE1(vcmdq, BASE));
@@ -639,9 +643,6 @@ 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);
}