linux-kernel - [PATCH kernel 1/2] crypto/ccp: Use PCI bridge defaults for IDE

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Message-ID: <20260123053057.1350569-2-aik@amd.com>
Date: Fri, 23 Jan 2026 16:30:56 +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 1/2] crypto/ccp: Use PCI bridge defaults for IDE

The current number of streams in AMD TSM is 1 which is too little,
the core uses 255. Also, even if the module parameter is increased,
calling pci_ide_set_nr_streams() second time triggers WARN_ON.

Simplify the code by sticking to the PCI core defaults.

Fixes: 4be423572da1 ("crypto/ccp: Implement SEV-TIO PCIe IDE (phase1)")
Signed-off-by: Alexey Kardashevskiy <aik@....com>
---
 drivers/crypto/ccp/sev-dev-tsm.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/crypto/ccp/sev-dev-tsm.c b/drivers/crypto/ccp/sev-dev-tsm.c
index ea29cd5d0ff9..7407b77c2ef2 100644
--- a/drivers/crypto/ccp/sev-dev-tsm.c
+++ b/drivers/crypto/ccp/sev-dev-tsm.c
@@ -19,12 +19,6 @@
 
 MODULE_IMPORT_NS("PCI_IDE");
 
-#define TIO_DEFAULT_NR_IDE_STREAMS	1
-
-static uint nr_ide_streams = TIO_DEFAULT_NR_IDE_STREAMS;
-module_param_named(ide_nr, nr_ide_streams, uint, 0644);
-MODULE_PARM_DESC(ide_nr, "Set the maximum number of IDE streams per PHB");
-
 #define dev_to_sp(dev)		((struct sp_device *)dev_get_drvdata(dev))
 #define dev_to_psp(dev)		((struct psp_device *)(dev_to_sp(dev)->psp_data))
 #define dev_to_sev(dev)		((struct sev_device *)(dev_to_psp(dev)->sev_data))
@@ -193,7 +187,6 @@ static void streams_teardown(struct pci_ide **ide)
 static int stream_alloc(struct pci_dev *pdev, struct pci_ide **ide,
 			unsigned int tc)
 {
-	struct pci_dev *rp = pcie_find_root_port(pdev);
 	struct pci_ide *ide1;
 
 	if (ide[tc]) {
@@ -201,11 +194,6 @@ static int stream_alloc(struct pci_dev *pdev, struct pci_ide **ide,
 		return -EBUSY;
 	}
 
-	/* FIXME: find a better way */
-	if (nr_ide_streams != TIO_DEFAULT_NR_IDE_STREAMS)
-		pci_notice(pdev, "Enable non-default %d streams", nr_ide_streams);
-	pci_ide_set_nr_streams(to_pci_host_bridge(rp->bus->bridge), nr_ide_streams);
-
 	ide1 = pci_ide_stream_alloc(pdev);
 	if (!ide1)
 		return -EFAULT;
-- 
2.52.0