Hi,
>When things go wrong on the gpu, we can get *thousands* of faults. With
>so many pr_err() prints, which were slowing down resuming the iommu,
>drm/msm would think the GPU had actually hung and reset it.
>
>Wire up the fault reporting, so instead we get a small ratelimited print
>of the fault address from drm/msm's fault handler instead.
>
>Signed-off-by: Rob Clark <[email protected]>
>---
> drivers/iommu/msm_iommu.c | 16 +++++++++++-----
> drivers/iommu/msm_iommu.h | 3 +++
> 2 files changed, 14 insertions(+), 5 deletions(-)
>
>diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
>index f6f596f..1110b72 100644
>--- a/drivers/iommu/msm_iommu.c
>+++ b/drivers/iommu/msm_iommu.c
>@@ -411,6 +411,7 @@ static int msm_iommu_attach_dev(struct iommu_domain
>*domain, struct device *dev)
> }
> __disable_clocks(iommu);
> list_add(&iommu->dom_node, &priv->list_attached);
>+ iommu->domain = domain;
> }
> }
>
>@@ -614,8 +615,8 @@ irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
> goto fail;
> }
>
>- pr_err("Unexpected IOMMU page fault!\n");
>- pr_err("base = %08x\n", (unsigned int)iommu->base);
>+ pr_debug("Unexpected IOMMU page fault!\n");
So was just thinking if its better to have only this as a
ratelimited print,
for global faults ?, otherwise
Reviewed-by: [email protected]
Regards,
Sricharan
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