From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Date: Wed, 6 Jul 2022 17:07:58 +0530
Subject: iommu/amd: Introduce per PCI segment alias_table
Git-commit: 99fc4ac3d2978cec1ae80dbc452fac1bb2cc976f
Patch-mainline: v6.0-rc1
References: bsc#1205701
This will replace global alias table (amd_iommu_alias_table).
Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-9-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
drivers/iommu/amd/amd_iommu_types.h | 7 +++++++
drivers/iommu/amd/init.c | 41 +++++++++++++++++++++++++++++--------
drivers/iommu/amd/iommu.c | 41 ++++++++++++++++++++++---------------
3 files changed, 64 insertions(+), 25 deletions(-)
diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 3ef68d588cc7..c9dd0ab37475 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -580,6 +580,13 @@ struct amd_iommu_pci_seg {
* will be copied to. It's only be used in kdump kernel.
*/
struct dev_table_entry *old_dev_tbl_cpy;
+
+ /*
+ * The alias table is a driver specific data structure which contains the
+ * mappings of the PCI device ids to the actual requestor ids on the IOMMU.
+ * More than one device can share the same requestor id.
+ */
+ u16 *alias_table;
};
/*
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index a750707e725b..2c8dbf2332bd 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -700,6 +700,31 @@ static inline void free_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
pci_seg->irq_lookup_table = NULL;
}
+static int __init alloc_alias_table(struct amd_iommu_pci_seg *pci_seg)
+{
+ int i;
+
+ pci_seg->alias_table = (void *)__get_free_pages(GFP_KERNEL,
+ get_order(alias_table_size));
+ if (!pci_seg->alias_table)
+ return -ENOMEM;
+
+ /*
+ * let all alias entries point to itself
+ */
+ for (i = 0; i <= amd_iommu_last_bdf; ++i)
+ pci_seg->alias_table[i] = i;
+
+ return 0;
+}
+
+static void __init free_alias_table(struct amd_iommu_pci_seg *pci_seg)
+{
+ free_pages((unsigned long)pci_seg->alias_table,
+ get_order(alias_table_size));
+ pci_seg->alias_table = NULL;
+}
+
/*
* Allocates the command buffer. This buffer is per AMD IOMMU. We can
* write commands to that buffer later and the IOMMU will execute them
@@ -1268,6 +1293,7 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
u32 dev_i, ext_flags = 0;
bool alias = false;
struct ivhd_entry *e;
+ struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
u32 ivhd_size;
int ret;
@@ -1349,7 +1375,7 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
devid_to = e->ext >> 8;
set_dev_entry_from_acpi(iommu, devid , e->flags, 0);
set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
- amd_iommu_alias_table[devid] = devid_to;
+ pci_seg->alias_table[devid] = devid_to;
break;
case IVHD_DEV_ALIAS_RANGE:
@@ -1407,7 +1433,7 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
devid = e->devid;
for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
if (alias) {
- amd_iommu_alias_table[dev_i] = devid_to;
+ pci_seg->alias_table[dev_i] = devid_to;
set_dev_entry_from_acpi(iommu,
devid_to, flags, ext_flags);
}
@@ -1542,6 +1568,8 @@ static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id)
if (alloc_dev_table(pci_seg))
return NULL;
+ if (alloc_alias_table(pci_seg))
+ return NULL;
if (alloc_rlookup_table(pci_seg))
return NULL;
@@ -1568,6 +1596,7 @@ static void __init free_pci_segments(void)
list_del(&pci_seg->list);
free_irq_lookup_table(pci_seg);
free_rlookup_table(pci_seg);
+ free_alias_table(pci_seg);
free_dev_table(pci_seg);
kfree(pci_seg);
}
@@ -2842,7 +2871,7 @@ static void __init ivinfo_init(void *ivrs)
static int __init early_amd_iommu_init(void)
{
struct acpi_table_header *ivrs_base;
- int i, remap_cache_sz, ret;
+ int remap_cache_sz, ret;
acpi_status status;
if (!amd_iommu_detected)
@@ -2913,12 +2942,6 @@ static int __init early_amd_iommu_init(void)
if (amd_iommu_pd_alloc_bitmap == NULL)
goto out;
- /*
- * let all alias entries point to itself
- */
- for (i = 0; i <= amd_iommu_last_bdf; ++i)
- amd_iommu_alias_table[i] = i;
-
/*
* never allocate domain 0 because its used as the non-allocated and
* error value placeholder
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 48275da7fcb0..378fa68f2fdd 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -243,7 +243,7 @@ static int clone_alias(struct pci_dev *pdev, u16 alias, void *data)
return 0;
}
-static void clone_aliases(struct device *dev)
+static void clone_aliases(struct amd_iommu *iommu, struct device *dev)
{
struct pci_dev *pdev;
@@ -256,14 +256,15 @@ static void clone_aliases(struct device *dev)
* part of the PCI DMA aliases if it's bus differs
* from the original device.
*/
- clone_alias(pdev, amd_iommu_alias_table[pci_dev_id(pdev)], NULL);
+ clone_alias(pdev, iommu->pci_seg->alias_table[pci_dev_id(pdev)], NULL);
pci_for_each_dma_alias(pdev, clone_alias, NULL);
}
-static void setup_aliases(struct device *dev)
+static void setup_aliases(struct amd_iommu *iommu, struct device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev);
+ struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
u16 ivrs_alias;
/* For ACPI HID devices, there are no aliases */
@@ -274,12 +275,12 @@ static void setup_aliases(struct device *dev)
* Add the IVRS alias to the pci aliases if it is on the same
* bus. The IVRS table may know about a quirk that we don't.
*/
- ivrs_alias = amd_iommu_alias_table[pci_dev_id(pdev)];
+ ivrs_alias = pci_seg->alias_table[pci_dev_id(pdev)];
if (ivrs_alias != pci_dev_id(pdev) &&
PCI_BUS_NUM(ivrs_alias) == pdev->bus->number)
pci_add_dma_alias(pdev, ivrs_alias & 0xff, 1);
- clone_aliases(dev);
+ clone_aliases(iommu, dev);
}
static struct iommu_dev_data *find_dev_data(u16 devid)
@@ -371,7 +372,7 @@ static bool check_device(struct device *dev)
return true;
}
-static int iommu_init_device(struct device *dev)
+static int iommu_init_device(struct amd_iommu *iommu, struct device *dev)
{
struct iommu_dev_data *dev_data;
int devid;
@@ -388,7 +389,7 @@ static int iommu_init_device(struct device *dev)
return -ENOMEM;
dev_data->dev = dev;
- setup_aliases(dev);
+ setup_aliases(iommu, dev);
/*
* By default we use passthrough mode for IOMMUv2 capable device.
@@ -409,7 +410,7 @@ static int iommu_init_device(struct device *dev)
return 0;
}
-static void iommu_ignore_device(struct device *dev)
+static void iommu_ignore_device(struct amd_iommu *iommu, struct device *dev)
{
int devid;
@@ -420,7 +421,7 @@ static void iommu_ignore_device(struct device *dev)
amd_iommu_rlookup_table[devid] = NULL;
memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
- setup_aliases(dev);
+ setup_aliases(iommu, dev);
}
static void amd_iommu_uninit_device(struct device *dev)
@@ -1290,6 +1291,7 @@ static int device_flush_dte(struct iommu_dev_data *dev_data)
{
struct amd_iommu *iommu;
struct pci_dev *pdev = NULL;
+ struct amd_iommu_pci_seg *pci_seg;
u16 alias;
int ret;
@@ -1306,7 +1308,8 @@ static int device_flush_dte(struct iommu_dev_data *dev_data)
if (ret)
return ret;
- alias = amd_iommu_alias_table[dev_data->devid];
+ pci_seg = iommu->pci_seg;
+ alias = pci_seg->alias_table[dev_data->devid];
if (alias != dev_data->devid) {
ret = iommu_flush_dte(iommu, alias);
if (ret)
@@ -1622,7 +1625,7 @@ static void do_attach(struct iommu_dev_data *dev_data,
/* Update device table */
set_dte_entry(dev_data->devid, domain,
ats, dev_data->iommu_v2);
- clone_aliases(dev_data->dev);
+ clone_aliases(iommu, dev_data->dev);
device_flush_dte(dev_data);
}
@@ -1638,7 +1641,7 @@ 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);
- clone_aliases(dev_data->dev);
+ clone_aliases(iommu, dev_data->dev);
/* Flush the DTE entry */
device_flush_dte(dev_data);
@@ -1821,12 +1824,12 @@ static struct iommu_device *amd_iommu_probe_device(struct device *dev)
if (dev_iommu_priv_get(dev))
return &iommu->iommu;
- ret = iommu_init_device(dev);
+ ret = iommu_init_device(iommu, dev);
if (ret) {
if (ret != -ENOTSUPP)
dev_err(dev, "Failed to initialize - trying to proceed anyway\n");
iommu_dev = ERR_PTR(ret);
- iommu_ignore_device(dev);
+ iommu_ignore_device(iommu, dev);
} else {
amd_iommu_set_pci_msi_domain(dev, iommu);
iommu_dev = &iommu->iommu;
@@ -1877,9 +1880,13 @@ static void update_device_table(struct protection_domain *domain)
struct iommu_dev_data *dev_data;
list_for_each_entry(dev_data, &domain->dev_list, list) {
+ struct amd_iommu *iommu = rlookup_amd_iommu(dev_data->dev);
+
+ if (!iommu)
+ continue;
set_dte_entry(dev_data->devid, domain,
dev_data->ats.enabled, dev_data->iommu_v2);
- clone_aliases(dev_data->dev);
+ clone_aliases(iommu, dev_data->dev);
}
}
@@ -2783,6 +2790,7 @@ static struct irq_remap_table *alloc_irq_table(u16 devid, struct pci_dev *pdev)
{
struct irq_remap_table *table = NULL;
struct irq_remap_table *new_table = NULL;
+ struct amd_iommu_pci_seg *pci_seg;
struct amd_iommu *iommu;
unsigned long flags;
u16 alias;
@@ -2793,11 +2801,12 @@ static struct irq_remap_table *alloc_irq_table(u16 devid, struct pci_dev *pdev)
if (!iommu)
goto out_unlock;
+ pci_seg = iommu->pci_seg;
table = irq_lookup_table[devid];
if (table)
goto out_unlock;
- alias = amd_iommu_alias_table[devid];
+ alias = pci_seg->alias_table[devid];
table = irq_lookup_table[alias];
if (table) {
set_remap_table_entry(iommu, devid, table);