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-rw-r--r--drivers/iommu/amd_iommu_init.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 3a210f0c1b3f..2a3b1b174d5e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -213,6 +213,13 @@ 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 enum iommu_init_state init_state = IOMMU_START_STATE;
static int amd_iommu_enable_interrupts(void);
@@ -738,6 +745,31 @@ static int __init add_special_device(u8 type, u8 id, u16 devid, bool cmd_line)
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
@@ -774,6 +806,12 @@ 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