From: Joerg Roedel <jroedel@suse.de>
Date: Tue, 20 Oct 2015 15:33:38 +0000 (+0200)
Subject: iommu/amd: Set alias DTE in do_attach/do_detach
X-Git-Tag: firefly_0821_release~176^2~781^2^7~7
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e25bfb56ea7f046b71414e02f80f620deb5c6362;hp=272e4f99e966989394b167b695ab489c60fe1243;p=firefly-linux-kernel-4.4.55.git

iommu/amd: Set alias DTE in do_attach/do_detach

With this we don't have to create dev_data entries for
non-existent devices (which only exist as request-ids).

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f8f54a4b1d8f..68b8ecf075ca 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1114,11 +1114,15 @@ static int device_flush_iotlb(struct iommu_dev_data *dev_data,
 static int device_flush_dte(struct iommu_dev_data *dev_data)
 {
 	struct amd_iommu *iommu;
+	u16 alias;
 	int ret;
 
 	iommu = amd_iommu_rlookup_table[dev_data->devid];
+	alias = amd_iommu_alias_table[dev_data->devid];
 
 	ret = iommu_flush_dte(iommu, dev_data->devid);
+	if (!ret && alias != dev_data->devid)
+		ret = iommu_flush_dte(iommu, alias);
 	if (ret)
 		return ret;
 
@@ -1984,29 +1988,36 @@ static void do_attach(struct iommu_dev_data *dev_data,
 		      struct protection_domain *domain)
 {
 	struct amd_iommu *iommu;
+	u16 alias;
 	bool ats;
 
 	iommu = amd_iommu_rlookup_table[dev_data->devid];
+	alias = amd_iommu_alias_table[dev_data->devid];
 	ats   = dev_data->ats.enabled;
 
 	/* Update data structures */
 	dev_data->domain = domain;
 	list_add(&dev_data->list, &domain->dev_list);
-	set_dte_entry(dev_data->devid, domain, ats);
 
 	/* Do reference counting */
 	domain->dev_iommu[iommu->index] += 1;
 	domain->dev_cnt                 += 1;
 
-	/* Flush the DTE entry */
+	/* Update device table */
+	set_dte_entry(dev_data->devid, domain, ats);
+	if (alias != dev_data->devid)
+		set_dte_entry(dev_data->devid, domain, ats);
+
 	device_flush_dte(dev_data);
 }
 
 static void do_detach(struct iommu_dev_data *dev_data)
 {
 	struct amd_iommu *iommu;
+	u16 alias;
 
 	iommu = amd_iommu_rlookup_table[dev_data->devid];
+	alias = amd_iommu_alias_table[dev_data->devid];
 
 	/* decrease reference counters */
 	dev_data->domain->dev_iommu[iommu->index] -= 1;
@@ -2016,6 +2027,8 @@ static void do_detach(struct iommu_dev_data *dev_data)
 	dev_data->domain = NULL;
 	list_del(&dev_data->list);
 	clear_dte_entry(dev_data->devid);
+	if (alias != dev_data->devid)
+		clear_dte_entry(alias);
 
 	/* Flush the DTE entry */
 	device_flush_dte(dev_data);