stable.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Rob Herring <robh@kernel.org>
To: "Toan Le" <toan@os.amperecomputing.com>,
	"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Andrew Murray" <amurray@thegoodpenguin.co.uk>
Cc: "Stéphane Graber" <stgraber@ubuntu.com>,
	stable@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] PCI: xgene: Fix IB window setup
Date: Mon, 29 Nov 2021 11:36:37 -0600	[thread overview]
Message-ID: <20211129173637.303201-1-robh@kernel.org> (raw)

Commit 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup")
broke PCI support on XGene. The cause is the IB resources are now sorted
in address order instead of being in DT dma-ranges order. The result is
which inbound registers are used for each region are swapped. I don't
know the details about this h/w, but it appears that IB region 0
registers can't handle a size greater than 4GB. In any case, limiting
the size for region 0 is enough to get back to the original assignment
of dma-ranges to regions.

Reported-by: Stéphane Graber <stgraber@ubuntu.com>
Fixes: 6dce5aa59e0b ("PCI: xgene: Use inbound resources for setup")
Link: https://lore.kernel.org/all/CA+enf=v9rY_xnZML01oEgKLmvY1NGBUUhnSJaETmXtDtXfaczA@mail.gmail.com/
Cc: stable@vger.kernel.org # v5.5+
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/pci-xgene.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-xgene.c b/drivers/pci/controller/pci-xgene.c
index 56d0d50338c8..d83dbd977418 100644
--- a/drivers/pci/controller/pci-xgene.c
+++ b/drivers/pci/controller/pci-xgene.c
@@ -465,7 +465,7 @@ static int xgene_pcie_select_ib_reg(u8 *ib_reg_mask, u64 size)
 		return 1;
 	}
 
-	if ((size > SZ_1K) && (size < SZ_1T) && !(*ib_reg_mask & (1 << 0))) {
+	if ((size > SZ_1K) && (size < SZ_4G) && !(*ib_reg_mask & (1 << 0))) {
 		*ib_reg_mask |= (1 << 0);
 		return 0;
 	}
-- 
2.32.0


             reply	other threads:[~2021-11-29 17:38 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-29 17:36 Rob Herring [this message]
2021-11-29 19:14 ` Stéphane Graber
2021-11-30  7:55 ` Krzysztof Wilczyński
2021-11-30 14:30 ` Lorenzo Pieralisi
2022-02-04 23:01 ` dann frazier
2022-02-05 16:05   ` Rob Herring
2022-02-05 21:12     ` dann frazier
2022-02-07 16:09       ` Rob Herring
2022-02-08  1:19         ` dann frazier
2022-02-08 14:34           ` Rob Herring
2022-02-11  2:16             ` dann frazier
2022-02-21 11:50               ` Thorsten Leemhuis
2022-02-06  9:52   ` Thorsten Leemhuis

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=20211129173637.303201-1-robh@kernel.org \
    --to=robh@kernel.org \
    --cc=amurray@thegoodpenguin.co.uk \
    --cc=bhelgaas@google.com \
    --cc=kw@linux.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=lorenzo.pieralisi@arm.com \
    --cc=stable@vger.kernel.org \
    --cc=stgraber@ubuntu.com \
    --cc=toan@os.amperecomputing.com \
    --subject='Re: [PATCH] PCI: xgene: Fix IB window setup' \
    /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

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).