iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()

Two WARNINGs are observed when SMMU driver rolls back upon failure:
 arm-smmu-v3.9.auto: Failed to register iommu
 arm-smmu-v3.9.auto: probe with driver arm-smmu-v3 failed with error -22
 ------------[ cut here ]------------
 WARNING: CPU: 5 PID: 1 at kernel/dma/mapping.c:74 dmam_free_coherent+0xc0/0xd8
 Call trace:
  dmam_free_coherent+0xc0/0xd8 (P)
  tegra241_vintf_free_lvcmdq+0x74/0x188
  tegra241_cmdqv_remove_vintf+0x60/0x148
  tegra241_cmdqv_remove+0x48/0xc8
  arm_smmu_impl_remove+0x28/0x60
  devm_action_release+0x1c/0x40
 ------------[ cut here ]------------
 128 pages are still in use!
 WARNING: CPU: 16 PID: 1 at mm/page_alloc.c:6902 free_contig_range+0x18c/0x1c8
 Call trace:
  free_contig_range+0x18c/0x1c8 (P)
  cma_release+0x154/0x2f0
  dma_free_contiguous+0x38/0xa0
  dma_direct_free+0x10c/0x248
  dma_free_attrs+0x100/0x290
  dmam_free_coherent+0x78/0xd8
  tegra241_vintf_free_lvcmdq+0x74/0x160
  tegra241_cmdqv_remove+0x98/0x198
  arm_smmu_impl_remove+0x28/0x60
  devm_action_release+0x1c/0x40

This is because the LVCMDQ queue memory are managed by devres, while that
dmam_free_coherent() is called in the context of devm_action_release().

Jason pointed out that "arm_smmu_impl_probe() has mis-ordered the devres
callbacks if ops->device_remove() is going to be manually freeing things
that probe allocated":
https://lore.kernel.org/linux-iommu/20250407174408.GB1722458@nvidia.com/

In fact, tegra241_cmdqv_init_structures() only allocates memory resources
which means any failure that it generates would be similar to -ENOMEM, so
there is no point in having that "falling back to standard SMMU" routine,
as the standard SMMU would likely fail to allocate memory too.

Remove the unwind part in tegra241_cmdqv_init_structures(), and return a
proper error code to ask SMMU driver to call tegra241_cmdqv_remove() via
impl_ops->device_remove(). Then, drop tegra241_vintf_free_lvcmdq() since
devres will take care of that.

Fixes: 483e0bd8883a ("iommu/tegra241-cmdqv: Do not allocate vcmdq until dma_set_mask_and_coherent")
Cc: stable@vger.kernel.org
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20250407201908.172225-1-nicolinc@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
index d525ab43a4aebfba06ac6de70ad5b7dcb5b5f616..dd7d030d2e89096514e3d369d277446c897392ba 100644 (file)
--- a/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
+++ b/drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c
@@ -487,17 +487,6 @@ static int tegra241_cmdqv_hw_reset(struct arm_smmu_device *smmu)
 
 /* VCMDQ Resource Helpers */
 
-static void tegra241_vcmdq_free_smmu_cmdq(struct tegra241_vcmdq *vcmdq)
-{
-       struct arm_smmu_queue *q = &vcmdq->cmdq.q;
-       size_t nents = 1 << q->llq.max_n_shift;
-       size_t qsz = nents << CMDQ_ENT_SZ_SHIFT;
-
-       if (!q->base)
-               return;
-       dmam_free_coherent(vcmdq->cmdqv->smmu.dev, qsz, q->base, q->base_dma);
-}
-
 static int tegra241_vcmdq_alloc_smmu_cmdq(struct tegra241_vcmdq *vcmdq)
 {
        struct arm_smmu_device *smmu = &vcmdq->cmdqv->smmu;
@@ -560,7 +549,8 @@ static void tegra241_vintf_free_lvcmdq(struct tegra241_vintf *vintf, u16 lidx)
        struct tegra241_vcmdq *vcmdq = vintf->lvcmdqs[lidx];
        char header[64];
 
-       tegra241_vcmdq_free_smmu_cmdq(vcmdq);
+       /* Note that the lvcmdq queue memory space is managed by devres */
+
        tegra241_vintf_deinit_lvcmdq(vintf, lidx);
 
        dev_dbg(vintf->cmdqv->dev,
@@ -768,13 +758,13 @@ static int tegra241_cmdqv_init_structures(struct arm_smmu_device *smmu)
 
        vintf = kzalloc(sizeof(*vintf), GFP_KERNEL);
        if (!vintf)
-               goto out_fallback;
+               return -ENOMEM;
 
        /* Init VINTF0 for in-kernel use */
        ret = tegra241_cmdqv_init_vintf(cmdqv, 0, vintf);
        if (ret) {
                dev_err(cmdqv->dev, "failed to init vintf0: %d\n", ret);
-               goto free_vintf;
+               return ret;
        }
 
        /* Preallocate logical VCMDQs to VINTF0 */
@@ -783,24 +773,12 @@ static int tegra241_cmdqv_init_structures(struct arm_smmu_device *smmu)
 
                vcmdq = tegra241_vintf_alloc_lvcmdq(vintf, lidx);
                if (IS_ERR(vcmdq))
-                       goto free_lvcmdq;
+                       return PTR_ERR(vcmdq);
        }
 
        /* Now, we are ready to run all the impl ops */
        smmu->impl_ops = &tegra241_cmdqv_impl_ops;
        return 0;
-
-free_lvcmdq:
-       for (lidx--; lidx >= 0; lidx--)
-               tegra241_vintf_free_lvcmdq(vintf, lidx);
-       tegra241_cmdqv_deinit_vintf(cmdqv, vintf->idx);
-free_vintf:
-       kfree(vintf);
-out_fallback:
-       dev_info(smmu->impl_dev, "Falling back to standard SMMU CMDQ\n");
-       smmu->options &= ~ARM_SMMU_OPT_TEGRA241_CMDQV;
-       tegra241_cmdqv_remove(smmu);
-       return 0;
 }
 
 #ifdef CONFIG_IOMMU_DEBUGFS