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path: root/drivers/iommu/amd_iommu_init.c
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Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c154
1 files changed, 138 insertions, 16 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 2f46881256a..bf51abb78de 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -213,6 +213,14 @@ enum iommu_init_state {
IOMMU_INIT_ERROR,
};
+/* Early ioapic and hpet maps from kernel command line */
+#define EARLY_MAP_SIZE 4
+static struct devid_map __initdata early_ioapic_map[EARLY_MAP_SIZE];
+static struct devid_map __initdata early_hpet_map[EARLY_MAP_SIZE];
+static int __initdata early_ioapic_map_size;
+static int __initdata early_hpet_map_size;
+static bool __initdata cmdline_maps;
+
static enum iommu_init_state init_state = IOMMU_START_STATE;
static int amd_iommu_enable_interrupts(void);
@@ -703,31 +711,66 @@ static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
set_iommu_for_device(iommu, devid);
}
-static int add_special_device(u8 type, u8 id, u16 devid)
+static int __init add_special_device(u8 type, u8 id, u16 devid, bool cmd_line)
{
struct devid_map *entry;
struct list_head *list;
- if (type != IVHD_SPECIAL_IOAPIC && type != IVHD_SPECIAL_HPET)
+ if (type == IVHD_SPECIAL_IOAPIC)
+ list = &ioapic_map;
+ else if (type == IVHD_SPECIAL_HPET)
+ list = &hpet_map;
+ else
return -EINVAL;
+ list_for_each_entry(entry, list, list) {
+ if (!(entry->id == id && entry->cmd_line))
+ continue;
+
+ pr_info("AMD-Vi: Command-line override present for %s id %d - ignoring\n",
+ type == IVHD_SPECIAL_IOAPIC ? "IOAPIC" : "HPET", id);
+
+ return 0;
+ }
+
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return -ENOMEM;
- entry->id = id;
- entry->devid = devid;
-
- if (type == IVHD_SPECIAL_IOAPIC)
- list = &ioapic_map;
- else
- list = &hpet_map;
+ entry->id = id;
+ entry->devid = devid;
+ entry->cmd_line = cmd_line;
list_add_tail(&entry->list, list);
return 0;
}
+static int __init add_early_maps(void)
+{
+ int i, ret;
+
+ for (i = 0; i < early_ioapic_map_size; ++i) {
+ ret = add_special_device(IVHD_SPECIAL_IOAPIC,
+ early_ioapic_map[i].id,
+ early_ioapic_map[i].devid,
+ early_ioapic_map[i].cmd_line);
+ if (ret)
+ return ret;
+ }
+
+ for (i = 0; i < early_hpet_map_size; ++i) {
+ ret = add_special_device(IVHD_SPECIAL_HPET,
+ early_hpet_map[i].id,
+ early_hpet_map[i].devid,
+ early_hpet_map[i].cmd_line);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
/*
* Reads the device exclusion range from ACPI and initializes the IOMMU with
* it
@@ -764,6 +807,12 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
u32 dev_i, ext_flags = 0;
bool alias = false;
struct ivhd_entry *e;
+ int ret;
+
+
+ ret = add_early_maps();
+ if (ret)
+ return ret;
/*
* First save the recommended feature enable bits from ACPI
@@ -929,7 +978,7 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
PCI_FUNC(devid));
set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
- ret = add_special_device(type, handle, devid);
+ ret = add_special_device(type, handle, devid, false);
if (ret)
return ret;
break;
@@ -1275,7 +1324,7 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
amd_iommu_int_handler,
amd_iommu_int_thread,
0, "AMD-Vi",
- iommu->dev);
+ iommu);
if (r) {
pci_disable_msi(iommu->dev);
@@ -1638,18 +1687,28 @@ static void __init free_on_init_error(void)
static bool __init check_ioapic_information(void)
{
+ const char *fw_bug = FW_BUG;
bool ret, has_sb_ioapic;
int idx;
has_sb_ioapic = false;
ret = false;
+ /*
+ * If we have map overrides on the kernel command line the
+ * messages in this function might not describe firmware bugs
+ * anymore - so be careful
+ */
+ if (cmdline_maps)
+ fw_bug = "";
+
for (idx = 0; idx < nr_ioapics; idx++) {
int devid, id = mpc_ioapic_id(idx);
devid = get_ioapic_devid(id);
if (devid < 0) {
- pr_err(FW_BUG "AMD-Vi: IOAPIC[%d] not in IVRS table\n", id);
+ pr_err("%sAMD-Vi: IOAPIC[%d] not in IVRS table\n",
+ fw_bug, id);
ret = false;
} else if (devid == IOAPIC_SB_DEVID) {
has_sb_ioapic = true;
@@ -1666,11 +1725,11 @@ static bool __init check_ioapic_information(void)
* when the BIOS is buggy and provides us the wrong
* device id for the IOAPIC in the system.
*/
- pr_err(FW_BUG "AMD-Vi: No southbridge IOAPIC found in IVRS table\n");
+ pr_err("%sAMD-Vi: No southbridge IOAPIC found\n", fw_bug);
}
if (!ret)
- pr_err("AMD-Vi: Disabling interrupt remapping due to BIOS Bug(s)\n");
+ pr_err("AMD-Vi: Disabling interrupt remapping\n");
return ret;
}
@@ -1801,6 +1860,7 @@ static int __init early_amd_iommu_init(void)
* Interrupt remapping enabled, create kmem_cache for the
* remapping tables.
*/
+ ret = -ENOMEM;
amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache",
MAX_IRQS_PER_TABLE * sizeof(u32),
IRQ_TABLE_ALIGNMENT,
@@ -2097,8 +2157,70 @@ static int __init parse_amd_iommu_options(char *str)
return 1;
}
-__setup("amd_iommu_dump", parse_amd_iommu_dump);
-__setup("amd_iommu=", parse_amd_iommu_options);
+static int __init parse_ivrs_ioapic(char *str)
+{
+ unsigned int bus, dev, fn;
+ int ret, id, i;
+ u16 devid;
+
+ ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
+
+ if (ret != 4) {
+ pr_err("AMD-Vi: Invalid command line: ivrs_ioapic%s\n", str);
+ return 1;
+ }
+
+ if (early_ioapic_map_size == EARLY_MAP_SIZE) {
+ pr_err("AMD-Vi: Early IOAPIC map overflow - ignoring ivrs_ioapic%s\n",
+ str);
+ return 1;
+ }
+
+ devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
+
+ cmdline_maps = true;
+ i = early_ioapic_map_size++;
+ early_ioapic_map[i].id = id;
+ early_ioapic_map[i].devid = devid;
+ early_ioapic_map[i].cmd_line = true;
+
+ return 1;
+}
+
+static int __init parse_ivrs_hpet(char *str)
+{
+ unsigned int bus, dev, fn;
+ int ret, id, i;
+ u16 devid;
+
+ ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
+
+ if (ret != 4) {
+ pr_err("AMD-Vi: Invalid command line: ivrs_hpet%s\n", str);
+ return 1;
+ }
+
+ if (early_hpet_map_size == EARLY_MAP_SIZE) {
+ pr_err("AMD-Vi: Early HPET map overflow - ignoring ivrs_hpet%s\n",
+ str);
+ return 1;
+ }
+
+ devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
+
+ cmdline_maps = true;
+ i = early_hpet_map_size++;
+ early_hpet_map[i].id = id;
+ early_hpet_map[i].devid = devid;
+ early_hpet_map[i].cmd_line = true;
+
+ return 1;
+}
+
+__setup("amd_iommu_dump", parse_amd_iommu_dump);
+__setup("amd_iommu=", parse_amd_iommu_options);
+__setup("ivrs_ioapic", parse_ivrs_ioapic);
+__setup("ivrs_hpet", parse_ivrs_hpet);
IOMMU_INIT_FINISH(amd_iommu_detect,
gart_iommu_hole_init,
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-13 07:44:53 +0000