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iommu/amd: Introduce per PCI segment unity map list

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Newer AMD systems can support multiple PCI segments. In order to support
multiple PCI segments IVMD table in IVRS structure is enhanced to
include pci segment id. Update ivmd_header structure to include "pci_seg".

Also introduce per PCI segment unity map list. It will replace global
amd_iommu_unity_map list.

Note that we have used "reserved" field in IVMD table to include "pci_seg
id" which was set to zero. It will take care of backward compatibility
(new kernel will work fine on older systems).

Co-developed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20220706113825.25582-10-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Vasant Hegde 2022-07-06 17:07:59 +05:30 committed by Joerg Roedel
parent 99fc4ac3d2
commit b618ae6247
3 changed files with 34 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/iommu/amd/amd_iommu_types.h
View File

@ -587,6 +587,13 @@ struct amd_iommu_pci_seg {
* More than one device can share the same requestor id.
*/
u16 *alias_table;
/*
* A list of required unity mappings we find in ACPI. It is not locked
* because as runtime it is only read. It is created at ACPI table
* parsing time.
*/
struct list_head unity_map;
};
/*
@ -813,12 +820,6 @@ struct unity_map_entry {
int prot;
};
/*
* List of all unity mappings. It is not locked because as runtime it is only
* read. It is created at ACPI table parsing time.
*/
extern struct list_head amd_iommu_unity_map;
/*
* Data structures for device handling
*/

30
drivers/iommu/amd/init.c
View File

@ -141,7 +141,8 @@ struct ivmd_header {
u16 length;
u16 devid;
u16 aux;
u64 resv;
u16 pci_seg;
u8 resv[6];
u64 range_start;
u64 range_length;
} __attribute__((packed));
@ -161,8 +162,6 @@ static int amd_iommu_target_ivhd_type;
u16 amd_iommu_last_bdf; /* largest PCI device id we have
to handle */
LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings
we find in ACPI */
LIST_HEAD(amd_iommu_pci_seg_list); /* list of all PCI segments */
LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
@ -1564,6 +1563,7 @@ static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id)
pci_seg->id = id;
init_llist_head(&pci_seg->dev_data_list);
INIT_LIST_HEAD(&pci_seg->unity_map);
list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list);
if (alloc_dev_table(pci_seg))
@ -2401,10 +2401,13 @@ enable_faults:
static void __init free_unity_maps(void)
{
struct unity_map_entry *entry, *next;
struct amd_iommu_pci_seg *p, *pci_seg;
list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
list_del(&entry->list);
kfree(entry);
for_each_pci_segment_safe(pci_seg, p) {
list_for_each_entry_safe(entry, next, &pci_seg->unity_map, list) {
list_del(&entry->list);
kfree(entry);
}
}
}
@ -2412,8 +2415,13 @@ static void __init free_unity_maps(void)
static int __init init_unity_map_range(struct ivmd_header *m)
{
struct unity_map_entry *e = NULL;
struct amd_iommu_pci_seg *pci_seg;
char *s;
pci_seg = get_pci_segment(m->pci_seg);
if (pci_seg == NULL)
return -ENOMEM;
e = kzalloc(sizeof(*e), GFP_KERNEL);
if (e == NULL)
return -ENOMEM;
@ -2451,14 +2459,16 @@ static int __init init_unity_map_range(struct ivmd_header *m)
if (m->flags & IVMD_FLAG_EXCL_RANGE)
e->prot = (IVMD_FLAG_IW | IVMD_FLAG_IR) >> 1;
DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
" range_start: %016llx range_end: %016llx flags: %x\n", s,
DUMP_printk("%s devid_start: %04x:%02x:%02x.%x devid_end: "
"%04x:%02x:%02x.%x range_start: %016llx range_end: %016llx"
" flags: %x\n", s, m->pci_seg,
PCI_BUS_NUM(e->devid_start), PCI_SLOT(e->devid_start),
PCI_FUNC(e->devid_start), PCI_BUS_NUM(e->devid_end),
PCI_FUNC(e->devid_start), m->pci_seg,
PCI_BUS_NUM(e->devid_end),
PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
e->address_start, e->address_end, m->flags);
list_add_tail(&e->list, &amd_iommu_unity_map);
list_add_tail(&e->list, &pci_seg->unity_map);
return 0;
}

8
drivers/iommu/amd/iommu.c
View File

@ -2237,13 +2237,19 @@ static void amd_iommu_get_resv_regions(struct device *dev,
{
struct iommu_resv_region *region;
struct unity_map_entry *entry;
struct amd_iommu *iommu;
struct amd_iommu_pci_seg *pci_seg;
int devid;
devid = get_device_id(dev);
if (devid < 0)
return;
iommu = rlookup_amd_iommu(dev);
if (!iommu)
return;
pci_seg = iommu->pci_seg;
list_for_each_entry(entry, &amd_iommu_unity_map, list) {
list_for_each_entry(entry, &pci_seg->unity_map, list) {
int type, prot = 0;
size_t length;