diff mbox

[v7,11/19] iommu/arm-smmu: Implement reserved region get/put callbacks

Message ID 1483969570-3154-12-git-send-email-eric.auger@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eric Auger Jan. 9, 2017, 1:46 p.m. UTC 
The get() populates the list with the MSI IOVA reserved window.

At the moment an arbitray MSI IOVA window is set at 0x8000000
of size 1MB. This will allow to report those info in iommu-group
sysfs.

Signed-off-by: Eric Auger <eric.auger@redhat.com>

---

v3 -> v4:
- do not handle PCI host bridge windows anymore
- encode prot

RFC v2 -> v3:
- use existing get/put_resv_regions

RFC v1 -> v2:
- use defines for MSI IOVA base and length
---
 drivers/iommu/arm-smmu.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Comments

Will Deacon Jan. 10, 2017, 2:16 p.m. UTC | #1 
On Mon, Jan 09, 2017 at 01:46:02PM +0000, Eric Auger wrote:
> The get() populates the list with the MSI IOVA reserved window.
> 
> At the moment an arbitray MSI IOVA window is set at 0x8000000
> of size 1MB. This will allow to report those info in iommu-group
> sysfs.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> 
> ---
> 
> v3 -> v4:
> - do not handle PCI host bridge windows anymore
> - encode prot
> 
> RFC v2 -> v3:
> - use existing get/put_resv_regions
> 
> RFC v1 -> v2:
> - use defines for MSI IOVA base and length
> ---
>  drivers/iommu/arm-smmu.c | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)

Acked-by: Will Deacon <will.deacon@arm.com>

Will
diff mbox

Patch

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index a60cded..a354572 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -281,6 +281,9 @@  enum arm_smmu_s2cr_privcfg {
 
 #define FSYNR0_WNR			(1 << 4)
 
+#define MSI_IOVA_BASE			0x8000000
+#define MSI_IOVA_LENGTH			0x100000
+
 static int force_stage;
 module_param(force_stage, int, S_IRUGO);
 MODULE_PARM_DESC(force_stage,
@@ -1549,6 +1552,29 @@  static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 	return iommu_fwspec_add_ids(dev, &fwid, 1);
 }
 
+static void arm_smmu_get_resv_regions(struct device *dev,
+				      struct list_head *head)
+{
+	struct iommu_resv_region *region;
+	int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+	region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
+					 prot, IOMMU_RESV_MSI);
+	if (!region)
+		return;
+
+	list_add_tail(&region->list, head);
+}
+
+static void arm_smmu_put_resv_regions(struct device *dev,
+				      struct list_head *head)
+{
+	struct iommu_resv_region *entry, *next;
+
+	list_for_each_entry_safe(entry, next, head, list)
+		kfree(entry);
+}
+
 static struct iommu_ops arm_smmu_ops = {
 	.capable		= arm_smmu_capable,
 	.domain_alloc		= arm_smmu_domain_alloc,
@@ -1564,6 +1590,8 @@  static int arm_smmu_of_xlate(struct device *dev, struct of_phandle_args *args)
 	.domain_get_attr	= arm_smmu_domain_get_attr,
 	.domain_set_attr	= arm_smmu_domain_set_attr,
 	.of_xlate		= arm_smmu_of_xlate,
+	.get_resv_regions	= arm_smmu_get_resv_regions,
+	.put_resv_regions	= arm_smmu_put_resv_regions,
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 };