Re: [PATCH] iommu: Properly pass gfp_t in _iommu_map() to avoid atomic sleeping
On Mon, Feb 01, 2021 at 05:06:23PM -0800, Douglas Anderson wrote: > drivers/iommu/iommu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Applied, thanks. ___ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: [PATCH] iommu: Properly pass gfp_t in _iommu_map() to avoid atomic sleeping
On Mon, Feb 01, 2021 at 05:06:23PM -0800, Douglas Anderson wrote:
> Sleeping while atomic = bad. Let's fix an obvious typo to try to avoid it.
>
> The warning that was seen (on a downstream kernel with the problematic
> patch backported):
>
> BUG: sleeping function called from invalid context at mm/page_alloc.c:4726
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9, name: ksoftirqd/0
> CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.93-12508-gc10c93e28e39 #1
> Call trace:
> dump_backtrace+0x0/0x154
> show_stack+0x20/0x2c
> dump_stack+0xa0/0xfc
> ___might_sleep+0x11c/0x12c
> __might_sleep+0x50/0x84
> __alloc_pages_nodemask+0xf8/0x2bc
> __arm_lpae_alloc_pages+0x48/0x1b4
> __arm_lpae_map+0x124/0x274
> __arm_lpae_map+0x1cc/0x274
> arm_lpae_map+0x140/0x170
> arm_smmu_map+0x78/0xbc
Damn, I'm annoyed that I didn't come across this in testing. Looks like
arm64 defconfig doesn't have DEBUG_ATOMIC_SLEEP, so that's probably why.
I'll see if I can adjust my scripts to enable that (and some others) for
the builds I actually run.
> __iommu_map+0xd4/0x210
> _iommu_map+0x4c/0x84
> iommu_map_atomic+0x44/0x58
> __iommu_dma_map+0x8c/0xc4
> iommu_dma_map_page+0xac/0xf0
>
> Fixes: d8c1df02ac7f ("iommu: Move iotlb_sync_map out from __iommu_map")
> Signed-off-by: Douglas Anderson
> ---
> I haven't done any serious testing on this. I saw a report of the
> warning and the fix seemed obvious so I'm shooting it out.
>
> drivers/iommu/iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Acked-by: Will Deacon
Joerg -- please can you apply this one on top of the pull request I sent
yesterday?
Cheers,
Will
___
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
Re: [PATCH] iommu: Properly pass gfp_t in _iommu_map() to avoid atomic sleeping
On Mon, 2021-02-01 at 17:06 -0800, Douglas Anderson wrote:
> Sleeping while atomic = bad. Let's fix an obvious typo to try to avoid it.
>
> The warning that was seen (on a downstream kernel with the problematic
> patch backported):
>
> BUG: sleeping function called from invalid context at mm/page_alloc.c:4726
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9, name: ksoftirqd/0
> CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.93-12508-gc10c93e28e39 #1
> Call trace:
> dump_backtrace+0x0/0x154
> show_stack+0x20/0x2c
> dump_stack+0xa0/0xfc
> ___might_sleep+0x11c/0x12c
> __might_sleep+0x50/0x84
> __alloc_pages_nodemask+0xf8/0x2bc
> __arm_lpae_alloc_pages+0x48/0x1b4
> __arm_lpae_map+0x124/0x274
> __arm_lpae_map+0x1cc/0x274
> arm_lpae_map+0x140/0x170
> arm_smmu_map+0x78/0xbc
> __iommu_map+0xd4/0x210
> _iommu_map+0x4c/0x84
> iommu_map_atomic+0x44/0x58
> __iommu_dma_map+0x8c/0xc4
> iommu_dma_map_page+0xac/0xf0
>
> Fixes: d8c1df02ac7f ("iommu: Move iotlb_sync_map out from __iommu_map")
> Signed-off-by: Douglas Anderson
oh. This is my fault. Thanks for the fix.
Reviewed-by: Yong Wu
> ---
> I haven't done any serious testing on this. I saw a report of the
> warning and the fix seemed obvious so I'm shooting it out.
>
> drivers/iommu/iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 3d099a31ddca..2b06b01850d5 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -2441,7 +2441,7 @@ static int _iommu_map(struct iommu_domain *domain,
> unsigned long iova,
> const struct iommu_ops *ops = domain->ops;
> int ret;
>
> - ret = __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL);
> + ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
> if (ret == 0 && ops->iotlb_sync_map)
> ops->iotlb_sync_map(domain, iova, size);
>
___
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
[PATCH] iommu: Properly pass gfp_t in _iommu_map() to avoid atomic sleeping
Sleeping while atomic = bad. Let's fix an obvious typo to try to avoid it.
The warning that was seen (on a downstream kernel with the problematic
patch backported):
BUG: sleeping function called from invalid context at mm/page_alloc.c:4726
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9, name: ksoftirqd/0
CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.93-12508-gc10c93e28e39 #1
Call trace:
dump_backtrace+0x0/0x154
show_stack+0x20/0x2c
dump_stack+0xa0/0xfc
___might_sleep+0x11c/0x12c
__might_sleep+0x50/0x84
__alloc_pages_nodemask+0xf8/0x2bc
__arm_lpae_alloc_pages+0x48/0x1b4
__arm_lpae_map+0x124/0x274
__arm_lpae_map+0x1cc/0x274
arm_lpae_map+0x140/0x170
arm_smmu_map+0x78/0xbc
__iommu_map+0xd4/0x210
_iommu_map+0x4c/0x84
iommu_map_atomic+0x44/0x58
__iommu_dma_map+0x8c/0xc4
iommu_dma_map_page+0xac/0xf0
Fixes: d8c1df02ac7f ("iommu: Move iotlb_sync_map out from __iommu_map")
Signed-off-by: Douglas Anderson
---
I haven't done any serious testing on this. I saw a report of the
warning and the fix seemed obvious so I'm shooting it out.
drivers/iommu/iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 3d099a31ddca..2b06b01850d5 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2441,7 +2441,7 @@ static int _iommu_map(struct iommu_domain *domain,
unsigned long iova,
const struct iommu_ops *ops = domain->ops;
int ret;
- ret = __iommu_map(domain, iova, paddr, size, prot, GFP_KERNEL);
+ ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
if (ret == 0 && ops->iotlb_sync_map)
ops->iotlb_sync_map(domain, iova, size);
--
2.30.0.365.g02bc693789-goog
___
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
