crypto: hisilicon/sec2 - Add iommu status check

In order to improve performance of small packets (<512Bytes)
in SMMU translation scenario, we need to identify the type of IOMMU
in the SEC probe to process small packets by a different method.

Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Signed-off-by: Zaibo Xu <xuzaibo@huawei.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/hisilicon/sec2/sec.h b/drivers/crypto/hisilicon/sec2/sec.h
index 13e2d8d..eab0d22 100644 (file)
--- a/drivers/crypto/hisilicon/sec2/sec.h
+++ b/drivers/crypto/hisilicon/sec2/sec.h
@@ -165,6 +165,7 @@ struct sec_dev {
        struct list_head list;
        struct sec_debug debug;
        u32 ctx_q_num;
+       bool iommu_used;
        u32 num_vfs;
        unsigned long status;
 };

diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c
index 1fe2558..4f354d7 100644 (file)
--- a/drivers/crypto/hisilicon/sec2/sec_main.c
+++ b/drivers/crypto/hisilicon/sec2/sec_main.c
@@ -7,6 +7,7 @@
 #include <linux/debugfs.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/iommu.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
@@ -832,6 +833,23 @@ static void sec_probe_uninit(struct hisi_qm *qm)
        destroy_workqueue(qm->wq);
 }
 
+static void sec_iommu_used_check(struct sec_dev *sec)
+{
+       struct iommu_domain *domain;
+       struct device *dev = &sec->qm.pdev->dev;
+
+       domain = iommu_get_domain_for_dev(dev);
+
+       /* Check if iommu is used */
+       sec->iommu_used = false;
+       if (domain) {
+               if (domain->type & __IOMMU_DOMAIN_PAGING)
+                       sec->iommu_used = true;
+               dev_info(dev, "SMMU Opened, the iommu type = %u\n",
+                       domain->type);
+       }
+}
+
 static int sec_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
        struct sec_dev *sec;
@@ -845,6 +863,7 @@ static int sec_probe(struct pci_dev *pdev, const struct pci_device_id *id)
        pci_set_drvdata(pdev, sec);
 
        sec->ctx_q_num = ctx_q_num;
+       sec_iommu_used_check(sec);
 
        qm = &sec->qm;