From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Date: Mon, 19 Aug 2019 13:22:53 +0000 Subject: [PATCH 08/11] iommu: Print default domain type on boot Message-Id: <20190819132256.14436-9-joro@8bytes.org> List-Id: References: <20190819132256.14436-1-joro@8bytes.org> In-Reply-To: <20190819132256.14436-1-joro@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Joerg Roedel Cc: corbet@lwn.net, tony.luck@intel.com, fenghua.yu@intel.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, x86@kernel.org, linux-doc@vger.kernel.org, linux-ia64@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Thomas.Lendacky@amd.com, Suravee.Suthikulpanit@amd.com, Joerg Roedel From: Joerg Roedel Introduce a subsys_initcall for IOMMU code and use it to print the default domain type at boot. Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 30 +++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3ee50bb22ca2..0ddd0bd1ff75 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -93,12 +93,40 @@ struct iommu_group_attribute iommu_group_attr_##_name = \ static LIST_HEAD(iommu_device_list); static DEFINE_SPINLOCK(iommu_device_lock); +/* + * Use a function instead of an array here because the domain-type is a + * bit-field, so an array would waste memory. + */ +static const char *iommu_domain_type_str(unsigned int t) +{ + switch (t) { + case IOMMU_DOMAIN_BLOCKED: + return "Blocked"; + case IOMMU_DOMAIN_IDENTITY: + return "Passthrough"; + case IOMMU_DOMAIN_UNMANAGED: + return "Unmanaged"; + case IOMMU_DOMAIN_DMA: + return "Translated"; + default: + return "Unknown"; + } +} + +static int __init iommu_subsys_init(void) +{ + pr_info("Default domain type: %s\n", + iommu_domain_type_str(iommu_def_domain_type)); + + return 0; +} +subsys_initcall(iommu_subsys_init); + int iommu_device_register(struct iommu_device *iommu) { spin_lock(&iommu_device_lock); list_add_tail(&iommu->list, &iommu_device_list); spin_unlock(&iommu_device_lock); - return 0; } -- 2.16.4