Commit 0785deab authored by Zhen Lei's avatar Zhen Lei
Browse files

iommu/arm-smmu-v3: Allow disabling ECMDQs at boot time 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7YUNJ



--------------------------------

Add boot option arm_smmu_v3.disable_ecmdq to support disabling ECMDQ
during startup. For example, add arm_smmu_v3.disable_ecmdq=1 in command
line to disable ECMDQ and use normal CMDQ.

Signed-off-by: default avatarZhen Lei <thunder.leizhen@huawei.com>
parent 8bcb9c38

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

+5 −1
Original line number Diff line number Diff line
@@ -46,6 +46,10 @@ module_param(disable_msipolling, bool, 0444); 
MODULE_PARM_DESC(disable_msipolling,

	"Disable MSI-based polling for CMD_SYNC completion.");



static bool disable_ecmdq;

module_param(disable_ecmdq, bool, 0444);

MODULE_PARM_DESC(disable_ecmdq,	"Disable the use of ECMDQs");



#ifdef CONFIG_SMMU_BYPASS_DEV

struct smmu_bypass_device {

	unsigned short vendor;
@@ -5129,7 +5133,7 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) 
	dev_info(smmu->dev, "ias %lu-bit, oas %lu-bit (features 0x%08x)\n",

		 smmu->ias, smmu->oas, smmu->features);



	if (smmu->features & ARM_SMMU_FEAT_ECMDQ) {

	if (smmu->features & ARM_SMMU_FEAT_ECMDQ && !disable_ecmdq) {

		int err;



		err = arm_smmu_ecmdq_probe(smmu);