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Subject[PATCH v2 16/16] iommu/vt-d: add intel iommu page response function
Date
This patch adds page response support for Intel VT-d.
Generic response data is taken from the IOMMU API
then parsed into VT-d specific response descriptor format.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/iommu/intel-iommu.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index ede0f2e..61ad26b 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5165,6 +5165,35 @@ static int intel_iommu_invalidate(struct iommu_domain *domain,
return ret;
}

+int intel_iommu_page_response(struct iommu_domain *domain, struct device *dev,
+ struct page_response_msg *msg)
+{
+ struct qi_desc resp;
+ struct intel_iommu *iommu = dev_to_intel_iommu(dev);
+
+ /* TODO: sanitize response message */
+ if (msg->last_req) {
+ /* Page Group Response */
+ resp.low = QI_PGRP_PASID(msg->pasid) |
+ QI_PGRP_DID(msg->did) |
+ QI_PGRP_PASID_P(msg->pasid_present) |
+ QI_PGRP_RESP_TYPE;
+ /* REVISIT: allow private data passing from device prq */
+ resp.high = QI_PGRP_IDX(msg->page_req_group_id) |
+ QI_PGRP_PRIV(msg->private_data) | QI_PGRP_RESP_CODE(msg->resp_code);
+ } else {
+ /* Page Stream Response */
+ resp.low = QI_PSTRM_IDX(msg->page_req_group_id) |
+ QI_PSTRM_PRIV(msg->private_data) | QI_PSTRM_BUS(PCI_BUS_NUM(msg->did)) |
+ QI_PSTRM_PASID(msg->pasid) | QI_PSTRM_RESP_TYPE;
+ resp.high = QI_PSTRM_ADDR(msg->paddr) | QI_PSTRM_DEVFN(msg->did & 0xff) |
+ QI_PSTRM_RESP_CODE(msg->resp_code);
+ }
+ qi_submit_sync(&resp, iommu);
+
+ return 0;
+}
+
static int intel_iommu_map(struct iommu_domain *domain,
unsigned long iova, phys_addr_t hpa,
size_t size, int iommu_prot)
@@ -5594,6 +5623,7 @@ const struct iommu_ops intel_iommu_ops = {
.bind_pasid_table = intel_iommu_bind_pasid_table,
.unbind_pasid_table = intel_iommu_unbind_pasid_table,
.invalidate = intel_iommu_invalidate,
+ .page_response = intel_iommu_page_response,
#endif
.map = intel_iommu_map,
.unmap = intel_iommu_unmap,
--
2.7.4
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