From: Eric Auger <eric.auger@redhat.com>
To: eric.auger.pro@gmail.com, eric.auger@redhat.com, joro@8bytes.org,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Cc: dwmw2@infradead.org
Subject: [PATCH] iommu/vt-d: Fix intel_pasid_max_id
Date: Tue, 30 Apr 2019 09:29:40 +0200 [thread overview]
Message-ID: <20190430072940.10467-1-eric.auger@redhat.com> (raw)
Extended Capability Register PSS field (PASID Size Supported)
corresponds to the PASID bit size -1.
"A value of N in this field indicates hardware supports PASID
field of N+1 bits (For example, value of 7 in this field,
indicates 8-bit PASIDs are supported)".
Fix the computation of intel_pasid_max_id accordingly.
Fixes: 562831747f62 ("iommu/vt-d: Global PASID name space")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
drivers/iommu/intel-iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 28cb713d728c..c3f1bfc81d2e 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3331,7 +3331,7 @@ static int __init init_dmars(void)
* than the smallest supported.
*/
if (pasid_supported(iommu)) {
- u32 temp = 2 << ecap_pss(iommu->ecap);
+ u32 temp = 2 << (ecap_pss(iommu->ecap) + 1);
intel_pasid_max_id = min_t(u32, temp,
intel_pasid_max_id);
--
2.20.1
next reply other threads:[~2019-04-30 7:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-30 7:29 Eric Auger [this message]
2019-04-30 18:01 ` [PATCH] iommu/vt-d: Fix intel_pasid_max_id Jacob Pan
2019-04-30 20:37 ` Auger Eric
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190430072940.10467-1-eric.auger@redhat.com \
--to=eric.auger@redhat.com \
--cc=dwmw2@infradead.org \
--cc=eric.auger.pro@gmail.com \
--cc=iommu@lists.linux-foundation.org \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox