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SubjectRe: [PATCH 4/4] drm/v3d: Fix and extend MMU error handling.
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Date
Hi,

On Thu, 2019-04-18 at 17:10 -0700, Eric Anholt wrote:
> We were setting the wrong flags to enable PTI errors, so we were
> seeing reads to invalid PTEs show up as write errors. Also, we
> weren't turning on the interrupts. The AXI IDs we were dumping
> included the outstanding write number and so they looked basically
> random. And the VIO_ADDR decoding was based on the MMU VA_WIDTH for
> the first platform I worked on and was wrong on others. In short,
> this was a thorough mess from early HW enabling.
>
> Tested on V3D 4.1 and 4.2 with intentional L2T, CLE, PTB, and TLB
> faults.

Didn't check the docs but looks sane too!

Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

Cheers,

Paul

> Signed-off-by: Eric Anholt <eric@anholt.net>
> ---
> drivers/gpu/drm/v3d/v3d_drv.c | 1 +
> drivers/gpu/drm/v3d/v3d_drv.h | 2 ++
> drivers/gpu/drm/v3d/v3d_irq.c | 31 +++++++++++++++++++++++++++----
> drivers/gpu/drm/v3d/v3d_mmu.c | 7 +++++--
> drivers/gpu/drm/v3d/v3d_regs.h | 3 ++-
> 5 files changed, 37 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c
> index 7ab36192e6bc..9ce2e4ef6c2a 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.c
> +++ b/drivers/gpu/drm/v3d/v3d_drv.c
> @@ -494,6 +494,7 @@ static int v3d_platform_drm_probe(struct platform_device *pdev)
> mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO);
> dev->coherent_dma_mask =
> DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH));
> + v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH);
>
> ident1 = V3D_READ(V3D_HUB_IDENT1);
> v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
> diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
> index 6d31a6a5a08e..64682923018d 100644
> --- a/drivers/gpu/drm/v3d/v3d_drv.h
> +++ b/drivers/gpu/drm/v3d/v3d_drv.h
> @@ -63,6 +63,8 @@ struct v3d_dev {
> */
> void *mmu_scratch;
> dma_addr_t mmu_scratch_paddr;
> + /* virtual address bits from V3D to the MMU. */
> + int va_width;
>
> /* Number of V3D cores. */
> u32 cores;
> diff --git a/drivers/gpu/drm/v3d/v3d_irq.c b/drivers/gpu/drm/v3d/v3d_irq.c
> index fac3c542860b..268d8a889ac5 100644
> --- a/drivers/gpu/drm/v3d/v3d_irq.c
> +++ b/drivers/gpu/drm/v3d/v3d_irq.c
> @@ -162,10 +162,33 @@ v3d_hub_irq(int irq, void *arg)
> V3D_HUB_INT_MMU_PTI |
> V3D_HUB_INT_MMU_CAP)) {
> u32 axi_id = V3D_READ(V3D_MMU_VIO_ID);
> - u64 vio_addr = (u64)V3D_READ(V3D_MMU_VIO_ADDR) << 8;
> -
> - dev_err(v3d->dev, "MMU error from client %d at 0x%08llx%s%s%s\n",
> - axi_id, (long long)vio_addr,
> + u64 vio_addr = ((u64)V3D_READ(V3D_MMU_VIO_ADDR) <<
> + (v3d->va_width - 32));
> + static const char *const v3d41_axi_ids[] = {
> + "L2T",
> + "PTB",
> + "PSE",
> + "TLB",
> + "CLE",
> + "TFU",
> + "MMU",
> + "GMP",
> + };
> + const char *client = "?";
> +
> + V3D_WRITE(V3D_MMU_CTL,
> + V3D_READ(V3D_MMU_CTL) & (V3D_MMU_CTL_CAP_EXCEEDED |
> + V3D_MMU_CTL_PT_INVALID |
> + V3D_MMU_CTL_WRITE_VIOLATION));
> +
> + if (v3d->ver >= 41) {
> + axi_id = axi_id >> 5;
> + if (axi_id < ARRAY_SIZE(v3d41_axi_ids))
> + client = v3d41_axi_ids[axi_id];
> + }
> +
> + dev_err(v3d->dev, "MMU error from client %s (%d) at 0x%llx%s%s%s\n",
> + client, axi_id, (long long)vio_addr,
> ((intsts & V3D_HUB_INT_MMU_WRV) ?
> ", write violation" : ""),
> ((intsts & V3D_HUB_INT_MMU_PTI) ?
> diff --git a/drivers/gpu/drm/v3d/v3d_mmu.c b/drivers/gpu/drm/v3d/v3d_mmu.c
> index 7a21f1787ab1..395e81d97163 100644
> --- a/drivers/gpu/drm/v3d/v3d_mmu.c
> +++ b/drivers/gpu/drm/v3d/v3d_mmu.c
> @@ -69,10 +69,13 @@ int v3d_mmu_set_page_table(struct v3d_dev *v3d)
> V3D_WRITE(V3D_MMU_PT_PA_BASE, v3d->pt_paddr >> V3D_MMU_PAGE_SHIFT);
> V3D_WRITE(V3D_MMU_CTL,
> V3D_MMU_CTL_ENABLE |
> - V3D_MMU_CTL_PT_INVALID |
> + V3D_MMU_CTL_PT_INVALID_ENABLE |
> V3D_MMU_CTL_PT_INVALID_ABORT |
> + V3D_MMU_CTL_PT_INVALID_INT |
> V3D_MMU_CTL_WRITE_VIOLATION_ABORT |
> - V3D_MMU_CTL_CAP_EXCEEDED_ABORT);
> + V3D_MMU_CTL_WRITE_VIOLATION_INT |
> + V3D_MMU_CTL_CAP_EXCEEDED_ABORT |
> + V3D_MMU_CTL_CAP_EXCEEDED_INT);
> V3D_WRITE(V3D_MMU_ILLEGAL_ADDR,
> (v3d->mmu_scratch_paddr >> V3D_MMU_PAGE_SHIFT) |
> V3D_MMU_ILLEGAL_ADDR_ENABLE);
> diff --git a/drivers/gpu/drm/v3d/v3d_regs.h b/drivers/gpu/drm/v3d/v3d_regs.h
> index eda1e289976f..9bcb57781d31 100644
> --- a/drivers/gpu/drm/v3d/v3d_regs.h
> +++ b/drivers/gpu/drm/v3d/v3d_regs.h
> @@ -152,7 +152,8 @@
> # define V3D_MMU_CTL_PT_INVALID_ABORT BIT(19)
> # define V3D_MMU_CTL_PT_INVALID_INT BIT(18)
> # define V3D_MMU_CTL_PT_INVALID_EXCEPTION BIT(17)
> -# define V3D_MMU_CTL_WRITE_VIOLATION BIT(16)
> +# define V3D_MMU_CTL_PT_INVALID_ENABLE BIT(16)
> +# define V3D_MMU_CTL_WRITE_VIOLATION BIT(12)
> # define V3D_MMU_CTL_WRITE_VIOLATION_ABORT BIT(11)
> # define V3D_MMU_CTL_WRITE_VIOLATION_INT BIT(10)
> # define V3D_MMU_CTL_WRITE_VIOLATION_EXCEPTION BIT(9)
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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