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Message-ID: <20241031184243.4184-8-suravee.suthikulpanit@amd.com>
Date: Thu, 31 Oct 2024 18:42:40 +0000
From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To: <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>
CC: <joro@...tes.org>, <robin.murphy@....com>, <vasant.hegde@....com>,
<jgg@...dia.com>, <kevin.tian@...el.com>, <jon.grimm@....com>,
<santosh.shukla@....com>, <pandoh@...gle.com>, <kumaranand@...gle.com>,
Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v8 07/10] iommu/amd: Introduce helper function get_dte256()
And use it in clone_alias() along with update_dte256().
Also use get_dte256() in dump_dte_entry().
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
drivers/iommu/amd/iommu.c | 61 ++++++++++++++++++++++++++++++++-------
1 file changed, 50 insertions(+), 11 deletions(-)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 8c69bb0e9454..1262ea7150f6 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -79,6 +79,8 @@ static void set_dte_entry(struct amd_iommu *iommu,
static void iommu_flush_dte_sync(struct amd_iommu *iommu, u16 devid);
+static struct iommu_dev_data *find_dev_data(struct amd_iommu *iommu, u16 devid);
+
/****************************************************************************
*
* Helper functions
@@ -189,6 +191,20 @@ static void update_dte256(struct amd_iommu *iommu, struct iommu_dev_data *dev_da
spin_unlock(&dev_data->dte_lock);
}
+static void get_dte256(struct amd_iommu *iommu, struct iommu_dev_data *dev_data,
+ struct dev_table_entry *dte)
+{
+ struct dev_table_entry *ptr;
+ struct dev_table_entry *dev_table = get_dev_table(iommu);
+
+ ptr = &dev_table[dev_data->devid];
+
+ spin_lock(&dev_data->dte_lock);
+ dte->data128[0] = READ_ONCE(ptr->data128[0]);
+ dte->data128[1] = READ_ONCE(ptr->data128[1]);
+ spin_unlock(&dev_data->dte_lock);
+}
+
static inline bool pdom_is_v2_pgtbl_mode(struct protection_domain *pdom)
{
return (pdom && (pdom->pd_mode == PD_MODE_V2));
@@ -337,9 +353,11 @@ static struct iommu_dev_data *search_dev_data(struct amd_iommu *iommu, u16 devid
static int clone_alias(struct pci_dev *pdev, u16 alias, void *data)
{
+ struct dev_table_entry new;
struct amd_iommu *iommu;
- struct dev_table_entry *dev_table;
+ struct iommu_dev_data *dev_data, *alias_data;
u16 devid = pci_dev_id(pdev);
+ int ret = 0;
if (devid == alias)
return 0;
@@ -348,13 +366,27 @@ static int clone_alias(struct pci_dev *pdev, u16 alias, void *data)
if (!iommu)
return 0;
- amd_iommu_set_rlookup_table(iommu, alias);
- dev_table = get_dev_table(iommu);
- memcpy(dev_table[alias].data,
- dev_table[devid].data,
- sizeof(dev_table[alias].data));
+ /* Copy the data from pdev */
+ dev_data = dev_iommu_priv_get(&pdev->dev);
+ if (!dev_data) {
+ pr_err("%s : Failed to get dev_data for 0x%x\n", __func__, devid);
+ ret = -EINVAL;
+ goto out;
+ }
+ get_dte256(iommu, dev_data, &new);
- return 0;
+ /* Setup alias */
+ alias_data = find_dev_data(iommu, alias);
+ if (!alias_data) {
+ pr_err("%s : Failed to get alias dev_data for 0x%x\n", __func__, alias);
+ ret = -EINVAL;
+ goto out;
+ }
+ update_dte256(iommu, alias_data, &new);
+
+ amd_iommu_set_rlookup_table(iommu, alias);
+out:
+ return ret;
}
static void clone_aliases(struct amd_iommu *iommu, struct device *dev)
@@ -627,6 +659,12 @@ static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
return -ENOMEM;
dev_data->dev = dev;
+
+ /*
+ * The dev_iommu_priv_set() needes to be called before setup_aliases.
+ * Otherwise, subsequent call to dev_iommu_priv_get() will fail.
+ */
+ dev_iommu_priv_set(dev, dev_data);
setup_aliases(iommu, dev);
/*
@@ -640,8 +678,6 @@ static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
dev_data->flags = pdev_get_caps(to_pci_dev(dev));
}
- dev_iommu_priv_set(dev, dev_data);
-
return 0;
}
@@ -688,10 +724,13 @@ static void amd_iommu_uninit_device(struct device *dev)
static void dump_dte_entry(struct amd_iommu *iommu, u16 devid)
{
int i;
- struct dev_table_entry *dev_table = get_dev_table(iommu);
+ struct dev_table_entry dte;
+ struct iommu_dev_data *dev_data = find_dev_data(iommu, devid);
+
+ get_dte256(iommu, dev_data, &dte);
for (i = 0; i < 4; ++i)
- pr_err("DTE[%d]: %016llx\n", i, dev_table[devid].data[i]);
+ pr_err("DTE[%d]: %016llx\n", i, dte.data[i]);
}
static void dump_command(unsigned long phys_addr)
--
2.34.1
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