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Message-ID: <CAAObsKB8e2MN-VJKYSeX1iibmA4d4i+GL+SWYiLHpg3g_Qby7g@mail.gmail.com>
Date: Mon, 24 Feb 2020 08:22:38 +0100
From: Tomeu Vizoso <tomeu.vizoso@...labora.com>
To: Rob Herring <robh@...nel.org>
Cc: open list <linux-kernel@...r.kernel.org>,
David Airlie <airlied@...ux.ie>,
dri-devel <dri-devel@...ts.freedesktop.org>,
Steven Price <steven.price@....com>,
Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v2] drm/panfrost: Don't try to map on error faults
On Wed, 12 Feb 2020 at 21:22, Rob Herring <robh@...nel.org> wrote:
>
> From: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>
> If the exception type isn't a translation fault, don't try to map and
> instead go straight to a terminal fault.
>
> Otherwise, we can get flooded by kernel warnings and further faults.
>
> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
> I rewrote this some simplifying the code and somewhat following Steven's
> suggested. Still not using defines though. No defines here was good
> enough before IMO.
>
> Only compile tested.
Looks good, I also tested it on RK3399.
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
Thanks,
Tomeu
> drivers/gpu/drm/panfrost/panfrost_mmu.c | 44 +++++++++++--------------
> 1 file changed, 19 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index 763cfca886a7..4f2836bd9215 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -596,33 +596,27 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
> source_id = (fault_status >> 16);
>
> /* Page fault only */
> - if ((status & mask) == BIT(i)) {
> - WARN_ON(exception_type < 0xC1 || exception_type > 0xC4);
> -
> + ret = -1;
> + if ((status & mask) == BIT(i) && (exception_type & 0xF8) == 0xC0)
> ret = panfrost_mmu_map_fault_addr(pfdev, i, addr);
> - if (!ret) {
> - mmu_write(pfdev, MMU_INT_CLEAR, BIT(i));
> - status &= ~mask;
> - continue;
> - }
> - }
>
> - /* terminal fault, print info about the fault */
> - dev_err(pfdev->dev,
> - "Unhandled Page fault in AS%d at VA 0x%016llX\n"
> - "Reason: %s\n"
> - "raw fault status: 0x%X\n"
> - "decoded fault status: %s\n"
> - "exception type 0x%X: %s\n"
> - "access type 0x%X: %s\n"
> - "source id 0x%X\n",
> - i, addr,
> - "TODO",
> - fault_status,
> - (fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
> - exception_type, panfrost_exception_name(pfdev, exception_type),
> - access_type, access_type_name(pfdev, fault_status),
> - source_id);
> + if (ret)
> + /* terminal fault, print info about the fault */
> + dev_err(pfdev->dev,
> + "Unhandled Page fault in AS%d at VA 0x%016llX\n"
> + "Reason: %s\n"
> + "raw fault status: 0x%X\n"
> + "decoded fault status: %s\n"
> + "exception type 0x%X: %s\n"
> + "access type 0x%X: %s\n"
> + "source id 0x%X\n",
> + i, addr,
> + "TODO",
> + fault_status,
> + (fault_status & (1 << 10) ? "DECODER FAULT" : "SLAVE FAULT"),
> + exception_type, panfrost_exception_name(pfdev, exception_type),
> + access_type, access_type_name(pfdev, fault_status),
> + source_id);
>
> mmu_write(pfdev, MMU_INT_CLEAR, mask);
>
> --
> 2.20.1
>
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