| From: Raj, Ashok
| Sent: Friday, November 17, 2017 7:48 AM
|
| Reported by: Harsh
| Reviewed by: Ashok Raj
| Tested by: Jacob Pan
Thanks everyone! I've updated our internal bug on this issue
and noted that we need to track down the remaining problems
which may be in our own code.
Casey
| From: Harsh Jain
| Sent: Tuesday, October 3, 2017 5:22 AM
|
| Hi Robin/Ashok,
|
| Find attached trace of DMA write error. I had a look on trace but didn't
| find anything suspicious.
|
| Let me know if you need more trace.
As a reminder, Harsh and Atul will be waking up in a few hours, so if th
| From: Harsh Jain
| Sent: Friday, September 29, 2017 1:14:45 AM
|
| Robin,
|
| I tried running patch on our test setup.
|
| With "intel_iommu=on" : I can see single occurrence of DMAR Write failure
| on perf traffic with 10 thread.
|
| [ 749.616480] perf: interrupt took too long (3203 >
Thanks Robin. Harsh can certainly test your latest patch as soon as he's
back in the office tomorrow morning India time. If your patch works and is
accepted, it sounds like the commit would be important enough to consider
backporting into various Long-Term Support releases and the affected
dist
| From: Raj, Ashok
| Sent: Wednesday, September 27, 2017 12:07 PM
|
| looking at the debug output i got from Harsh it still looks like a bug in
| the code.
|
| [ 538.284589] __domain_mapping nr_pages 0x1
| [ 538.284600] __domain_mapping sg_res 0x1 sg->dma_address 0xf291000e dma len
| 0x38 pteval
Hey Raj,
Let us know if you need help in gathering more debugging information. For
the time being we've decided to ERRATA the use of the Intel I/O MMU with
IPsec till we Root Cause the issue. But this is still at the top of Harsh's
bug list.
With Robin's comments, I'm almost sure that the:
| From: Robin Murphy
| Sent: Wednesday, September 27, 2017 10:18 AM
|
| From my experience, in general terms each scatterlist segment
| represents some contiguous quantity of pages, of which sg->page is the
| first, while sg->length and sg->offset describe the specific bounds of
| that segment's
| From: Dan Williams
| Sent: Tuesday, September 26, 2017 9:10 AM
|
| On Tue, Sep 26, 2017 at 9:06 AM, Casey Leedom wrote:
| > | From: Robin Murphy
| > | Sent: Tuesday, September 26, 2017 7:22 AM
| > |...
| > ...
| > Regardless, it seems that you agree that there's an
So just to be 100% sure I understand the patch you're proposing, you got
the first use of VTD_PAGE_SHIFT wrong; it should have been VTD_PAGE_MASK? I.e.
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6784a05..d43b566 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/dr
| From: Robin Murphy
| Sent: Tuesday, September 26, 2017 7:22 AM
|
| On 26/09/17 13:21, Harsh Jain wrote:
| > Find attached new set of log. After repeated tries it panics.
|
| Thanks, that makes things a bit clearer - looks like fixing the physical
| address/pteval calculation to not be off by a p
| From: Raj, Ashok
| Sent: Monday, September 25, 2017 12:03 PM
|
| On Mon, Sep 25, 2017 at 01:11:04PM -0700, Dan Williams wrote:
| > On Mon, Sep 25, 2017 at 1:05 PM, Casey Leedom wrote:
| > > | From: Dan Williams
| > > | Sent: Monday, September 25, 2017 12:31 PM
| > >
| From: David Woodhouse
| Sent: Monday, September 25, 2017 11:45 AM
|
| On Wed, 2017-09-20 at 16:01 +0800, Herbert Xu wrote:
| > Harsh Jain wrote:
| > >
| > > While debugging DMA mapping error in chelsio crypto driver we
| > observed that when scatter/gather list received by driver has some
| > e
| From: Dan Williams
| Sent: Monday, September 25, 2017 12:31 PM
| ...
| IIUC it looks like this has been broken ever since commit e1605495c716
| "intel-iommu: Introduce domain_sg_mapping() to speed up
| intel_map_sg()". I.e. it looks like the calculation for pte_val should
| be:
|
| pteval =
| From: Raj, Ashok
| Sent: Monday, September 25, 2017 8:54 AM
|
| Not sure how the page->offset would end up being greater than page-size?
|
| If you have additional traces, please send them by.
|
| Is this a new driver? wondering how we didn't run into this?
According to Herbert Xu and one of
| From: Robin Murphy
| Sent: Wednesday, September 20, 2017 3:12 AM
|
| On 20/09/17 09:01, Herbert Xu wrote:
| >
| > Harsh Jain wrote:
| >>
| >> While debugging DMA mapping error in chelsio crypto driver we
| >> observed that when scatter/gather list received by driver has
| >> some entry with pag
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