linux-kernel - [PATCH kernel 2/2] crypto/ccp: Allow multiple streams on the same root bridge

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Message-ID: <20260123053057.1350569-3-aik@amd.com>
Date: Fri, 23 Jan 2026 16:30:57 +1100
From: Alexey Kardashevskiy <aik@....com>
To: <linux-crypto@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, Ashish Kalra <ashish.kalra@....com>, "Tom
 Lendacky" <thomas.lendacky@....com>, John Allen <john.allen@....com>,
	"Herbert Xu" <herbert@...dor.apana.org.au>, "David S. Miller"
	<davem@...emloft.net>, Dan Williams <dan.j.williams@...el.com>, Alexey
 Kardashevskiy <aik@....com>, <x86@...nel.org>, <linux-coco@...ts.linux.dev>,
	"Pratik R . Sampat" <prsampat@....com>
Subject: [PATCH kernel 2/2] crypto/ccp: Allow multiple streams on the same root bridge

IDE stream IDs are responsibility of a platform and in some cases TSM
allocates the numbers. AMD SEV TIO though leaves it to the host OS.
Mistakenly stream ID is hard coded to be the same as a traffic class.

Use the host bridge stream index for a newly allocated stream ID.

Fixes: 4be423572da1 ("crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)")
Signed-off-by: Alexey Kardashevskiy <aik@....com>
---
 drivers/crypto/ccp/sev-dev-tsm.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/crypto/ccp/sev-dev-tsm.c b/drivers/crypto/ccp/sev-dev-tsm.c
index 7407b77c2ef2..40d02adaf3f6 100644
--- a/drivers/crypto/ccp/sev-dev-tsm.c
+++ b/drivers/crypto/ccp/sev-dev-tsm.c
@@ -198,8 +198,7 @@ static int stream_alloc(struct pci_dev *pdev, struct pci_ide **ide,
 	if (!ide1)
 		return -EFAULT;
 
-	/* Blindly assign streamid=0 to TC=0, and so on */
-	ide1->stream_id = tc;
+	ide1->stream_id = ide1->host_bridge_stream;
 
 	ide[tc] = ide1;
 
-- 
2.52.0