[PATCH 3/4] s390: iommu: Adding get attributes for s390_iommu

Pierre Morel
2019-05-10T08:22:34Z

We add "get attributes" to the S390 iommu operations to retrieve the S390
specific attributes through the call of zPCI dedicated CLP functions.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
drivers/iommu/s390-iommu.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++
include/linux/iommu.h | 4 +++
2 files changed, 81 insertions(+)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index 22d4db3..98082f0 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -363,6 +363,82 @@ void zpci_destroy_iommu(struct zpci_dev *zdev)
iommu_device_sysfs_remove(&zdev->iommu_dev);
}

+struct zpci_dev *get_zpci(struct s390_domain *s390_domain)
+{
+ struct s390_domain_device *domain_device;
+
+ domain_device = list_first_entry(&s390_domain->devices,
+ struct s390_domain_device, list);
+ if (!domain_device)
+ return NULL;
+ return domain_device->zdev;
+}
+
+static int s390_domain_get_fn(struct iommu_domain *domain, void *data)
+{
+ struct zpci_dev *zdev;
+ struct clp_req_rsp_query_pci *rrb;
+ int rc;
+
+ zdev = get_zpci(to_s390_domain(domain));
+ if (!zdev)
+ return -ENODEV;
+ rrb = (struct clp_req_rsp_query_pci *)
+ __get_free_pages(GFP_KERNEL, get_order(CLP_BLK_SIZE));
+ if (!rrb)
+ return -ENOMEM;
+ rc = zdev_query_pci_fn(zdev, rrb);
+
+ if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
+ memcpy(data, &rrb->response, sizeof(struct clp_rsp_query_pci));
+ else
+ rc = -EIO;
+ free_pages((unsigned long) rrb, get_order(CLP_BLK_SIZE));
+ return rc;
+}
+
+static int s390_domain_get_grp(struct iommu_domain *domain, void *data)
+{
+ struct zpci_dev *zdev;
+ struct clp_req_rsp_query_pci_grp *rrb;
+ int rc;
+
+ zdev = get_zpci(to_s390_domain(domain));
+ if (!zdev)
+ return -ENODEV;
+ rrb = (struct clp_req_rsp_query_pci_grp *)
+ __get_free_pages(GFP_KERNEL, get_order(CLP_BLK_SIZE));
+ if (!rrb)
+ return -ENOMEM;
+
+ rc = zdev_query_pci_fngrp(zdev, rrb);
+ if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
+ memcpy(data, &rrb->response,
+ sizeof(struct clp_rsp_query_pci_grp));
+ else
+ rc = -EIO;
+
+ free_pages((unsigned long) rrb, get_order(CLP_BLK_SIZE));
+ return rc;
+}
+
+static int s390_domain_get_attr(struct iommu_domain *domain,
+ enum iommu_attr attr, void *data)
+{
+ switch (attr) {
+ case DOMAIN_ATTR_ZPCI_FN_SIZE:
+ return sizeof(struct clp_rsp_query_pci);
+ case DOMAIN_ATTR_ZPCI_GRP_SIZE:
+ return sizeof(struct clp_rsp_query_pci_grp);
+ case DOMAIN_ATTR_ZPCI_FN:
+ return s390_domain_get_fn(domain, data);
+ case DOMAIN_ATTR_ZPCI_GRP:
+ return s390_domain_get_grp(domain, data);
+ default:
+ return -ENODEV;
+ }
+}
+
static const struct iommu_ops s390_iommu_ops = {
.capable = s390_iommu_capable,
.domain_alloc = s390_domain_alloc,
@@ -376,6 +452,7 @@ static const struct iommu_ops s390_iommu_ops = {
.remove_device = s390_iommu_remove_device,
.device_group = generic_device_group,
.pgsize_bitmap = S390_IOMMU_PGSIZES,
+ .domain_get_attr = s390_domain_get_attr,
};

static int __init s390_iommu_init(void)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index ffbbc7e..ebdcac4 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -125,6 +125,10 @@ enum iommu_attr {
DOMAIN_ATTR_FSL_PAMUV1,
DOMAIN_ATTR_NESTING, /* two stages of translation */
DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
+ DOMAIN_ATTR_ZPCI_FN_SIZE,
+ DOMAIN_ATTR_ZPCI_GRP_SIZE,
+ DOMAIN_ATTR_ZPCI_FN,
+ DOMAIN_ATTR_ZPCI_GRP,
DOMAIN_ATTR_MAX,
};

--
2.7.4