netdev - [PATCH net V2 2/4] net: wwan: iosm: fix driver not working with INTEL

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Message-Id: <20221107073502.1978194-1-m.chetan.kumar@linux.intel.com>
Date:   Mon,  7 Nov 2022 13:05:02 +0530
From:   m.chetan.kumar@...ux.intel.com
To:     netdev@...r.kernel.org
Cc:     kuba@...nel.org, davem@...emloft.net, johannes@...solutions.net,
        ryazanov.s.a@...il.com, loic.poulain@...aro.org,
        m.chetan.kumar@...el.com, edumazet@...gle.com, pabeni@...hat.com,
        linuxwwan@...el.com,
        M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
Subject: [PATCH net V2 2/4] net: wwan: iosm: fix driver not working with INTEL_IOMMU disabled

From: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>

With INTEL_IOMMU disable config or by forcing intel_iommu=off from
grub some of the features of IOSM driver like browsing, flashing &
coredump collection is not working.

When driver calls DMA API - dma_map_single() for tx transfers. It is
resulting in dma mapping error.

Set the device DMA addressing capabilities using dma_set_mask() and
remove the INTEL_IOMMU dependency in kconfig so that driver follows
the platform config either INTEL_IOMMU enable or disable.

Fixes: f7af616c632e ("net: iosm: infrastructure")
Signed-off-by: M Chetan Kumar <m.chetan.kumar@...ux.intel.com>
--
v2:
 * Add dependency on PCI in kconfig file to resolve kernel test robot
   reported errors.
---
 drivers/net/wwan/Kconfig              | 2 +-
 drivers/net/wwan/iosm/iosm_ipc_pcie.c | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wwan/Kconfig b/drivers/net/wwan/Kconfig
index 3486ffe94ac4..ac4d73b5626f 100644
--- a/drivers/net/wwan/Kconfig
+++ b/drivers/net/wwan/Kconfig
@@ -94,7 +94,7 @@ config RPMSG_WWAN_CTRL
 
 config IOSM
 	tristate "IOSM Driver for Intel M.2 WWAN Device"
-	depends on INTEL_IOMMU
+	depends on PCI
 	select NET_DEVLINK
 	select RELAY if WWAN_DEBUGFS
 	help
diff --git a/drivers/net/wwan/iosm/iosm_ipc_pcie.c b/drivers/net/wwan/iosm/iosm_ipc_pcie.c
index 97cb6846c6ae..d3d34d1c4704 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_pcie.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_pcie.c
@@ -259,6 +259,7 @@ static int ipc_pcie_probe(struct pci_dev *pci,
 			  const struct pci_device_id *pci_id)
 {
 	struct iosm_pcie *ipc_pcie = kzalloc(sizeof(*ipc_pcie), GFP_KERNEL);
+	int ret;
 
 	pr_debug("Probing device 0x%X from the vendor 0x%X", pci_id->device,
 		 pci_id->vendor);
@@ -291,6 +292,12 @@ static int ipc_pcie_probe(struct pci_dev *pci,
 		goto pci_enable_fail;
 	}
 
+	ret = dma_set_mask(ipc_pcie->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(ipc_pcie->dev, "Could not set PCI DMA mask: %d", ret);
+		return ret;
+	}
+
 	ipc_pcie_config_aspm(ipc_pcie);
 	dev_dbg(ipc_pcie->dev, "PCIe device enabled.");
 
-- 
2.34.1