Before commit 9495b7e92f716ab2 ("driver core: platform: Initialize
dma_parms for platform devices"), the R-Car SATA device didn't have DMA
parameters. Hence the DMA boundary mask supplied by its driver was
silently ignored, as __scsi_init_queue() doesn't check the return value
of dma_set_seg_boundary(), and the default value of 0xffffffff was used.
Now the device has gained DMA parameters, the driver-supplied value is
used, and the following warning is printed on Salvator-XS:
DMA-API: sata_rcar ee300000.sata: mapping sg segment across boundary [start=0x00000000ffffe000] [end=0x00000000ffffefff] [boundary=0x000000001ffffffe]
WARNING: CPU: 5 PID: 38 at kernel/dma/debug.c:1233 debug_dma_map_sg+0x298/0x300
(the range of start/end values depend on whether IOMMU support is
enabled or not)
The issue here is that SATA_RCAR_DMA_BOUNDARY doesn't have bit 0 set, so
any typical end value, which is odd, will trigger the check.
Fix this by increasing the DMA boundary value by 1.
Fixes: 8bfbeed58665dbbf ("sata_rcar: correct 'sata_rcar_sht'")
Fixes: 9495b7e92f716ab2 ("driver core: platform: Initialize dma_parms for platform devices")
Signed-off-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Sergei Shtylyov <[email protected]>
Tested-by: Lad Prabhakar <[email protected]>
Cc: stable <[email protected]>
---
v2:
- Add Reviewed-by, Tested-by, Cc.
This is a fix for a regression in v5.7-rc5 that fell through the cracks.
https://lore.kernel.org/linux-ide/[email protected]/
As by default the DMA debug code prints the first error only, this issue
may be hidden on plain v5.7-rc5, where the FCP driver triggers a similar
warning. Merging commit dd844fb8e50b12e6 ("media: platform: fcp: Set
appropriate DMA parameters", in v5.8-rc1) from the media tree fixes the
FCP issue, and exposes the SATA issue.
I added the second fixes tag because that commit is already being
backported to stable kernels, and this patch thus needs backporting,
too.
---
drivers/ata/sata_rcar.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
index 141ac600b64c87ef..44b0ed8f6bb8a120 100644
--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -120,7 +120,7 @@
/* Descriptor table word 0 bit (when DTA32M = 1) */
#define SATA_RCAR_DTEND BIT(0)
-#define SATA_RCAR_DMA_BOUNDARY 0x1FFFFFFEUL
+#define SATA_RCAR_DMA_BOUNDARY 0x1FFFFFFFUL
/* Gen2 Physical Layer Control Registers */
#define RCAR_GEN2_PHY_CTL1_REG 0x1704
--
2.17.1
On Tue, 11 Aug 2020 at 10:17, Geert Uytterhoeven
<[email protected]> wrote:
>
> Before commit 9495b7e92f716ab2 ("driver core: platform: Initialize
> dma_parms for platform devices"), the R-Car SATA device didn't have DMA
> parameters. Hence the DMA boundary mask supplied by its driver was
> silently ignored, as __scsi_init_queue() doesn't check the return value
> of dma_set_seg_boundary(), and the default value of 0xffffffff was used.
>
> Now the device has gained DMA parameters, the driver-supplied value is
> used, and the following warning is printed on Salvator-XS:
>
> DMA-API: sata_rcar ee300000.sata: mapping sg segment across boundary [start=0x00000000ffffe000] [end=0x00000000ffffefff] [boundary=0x000000001ffffffe]
> WARNING: CPU: 5 PID: 38 at kernel/dma/debug.c:1233 debug_dma_map_sg+0x298/0x300
>
> (the range of start/end values depend on whether IOMMU support is
> enabled or not)
>
> The issue here is that SATA_RCAR_DMA_BOUNDARY doesn't have bit 0 set, so
> any typical end value, which is odd, will trigger the check.
>
> Fix this by increasing the DMA boundary value by 1.
>
> Fixes: 8bfbeed58665dbbf ("sata_rcar: correct 'sata_rcar_sht'")
> Fixes: 9495b7e92f716ab2 ("driver core: platform: Initialize dma_parms for platform devices")
> Signed-off-by: Geert Uytterhoeven <[email protected]>
> Reviewed-by: Christoph Hellwig <[email protected]>
> Reviewed-by: Greg Kroah-Hartman <[email protected]>
> Reviewed-by: Sergei Shtylyov <[email protected]>
> Tested-by: Lad Prabhakar <[email protected]>
> Cc: stable <[email protected]>
Reviewed-by: Ulf Hansson <[email protected]>
Kind regards
Uffe
> ---
> v2:
> - Add Reviewed-by, Tested-by, Cc.
>
> This is a fix for a regression in v5.7-rc5 that fell through the cracks.
> https://lore.kernel.org/linux-ide/[email protected]/
>
> As by default the DMA debug code prints the first error only, this issue
> may be hidden on plain v5.7-rc5, where the FCP driver triggers a similar
> warning. Merging commit dd844fb8e50b12e6 ("media: platform: fcp: Set
> appropriate DMA parameters", in v5.8-rc1) from the media tree fixes the
> FCP issue, and exposes the SATA issue.
>
> I added the second fixes tag because that commit is already being
> backported to stable kernels, and this patch thus needs backporting,
> too.
> ---
> drivers/ata/sata_rcar.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c
> index 141ac600b64c87ef..44b0ed8f6bb8a120 100644
> --- a/drivers/ata/sata_rcar.c
> +++ b/drivers/ata/sata_rcar.c
> @@ -120,7 +120,7 @@
> /* Descriptor table word 0 bit (when DTA32M = 1) */
> #define SATA_RCAR_DTEND BIT(0)
>
> -#define SATA_RCAR_DMA_BOUNDARY 0x1FFFFFFEUL
> +#define SATA_RCAR_DMA_BOUNDARY 0x1FFFFFFFUL
>
> /* Gen2 Physical Layer Control Registers */
> #define RCAR_GEN2_PHY_CTL1_REG 0x1704
> --
> 2.17.1
>