/* * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. * Author: Joerg Roedel * Leo Duran * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #include /* * definitions for the ACPI scanning code */ #define UPDATE_LAST_BDF(x) do {\ if ((x) > amd_iommu_last_bdf) \ amd_iommu_last_bdf = (x); \ } while (0); #define DEVID(bus, devfn) (((bus) << 8) | (devfn)) #define PCI_BUS(x) (((x) >> 8) & 0xff) #define IVRS_HEADER_LENGTH 48 #define TBL_SIZE(x) (1 << (PAGE_SHIFT + get_order(amd_iommu_last_bdf * (x)))) #define ACPI_IVHD_TYPE 0x10 #define ACPI_IVMD_TYPE_ALL 0x20 #define ACPI_IVMD_TYPE 0x21 #define ACPI_IVMD_TYPE_RANGE 0x22 #define IVHD_DEV_ALL 0x01 #define IVHD_DEV_SELECT 0x02 #define IVHD_DEV_SELECT_RANGE_START 0x03 #define IVHD_DEV_RANGE_END 0x04 #define IVHD_DEV_ALIAS 0x42 #define IVHD_DEV_ALIAS_RANGE 0x43 #define IVHD_DEV_EXT_SELECT 0x46 #define IVHD_DEV_EXT_SELECT_RANGE 0x47 #define IVHD_FLAG_HT_TUN_EN 0x00 #define IVHD_FLAG_PASSPW_EN 0x01 #define IVHD_FLAG_RESPASSPW_EN 0x02 #define IVHD_FLAG_ISOC_EN 0x03 #define IVMD_FLAG_EXCL_RANGE 0x08 #define IVMD_FLAG_UNITY_MAP 0x01 #define ACPI_DEVFLAG_INITPASS 0x01 #define ACPI_DEVFLAG_EXTINT 0x02 #define ACPI_DEVFLAG_NMI 0x04 #define ACPI_DEVFLAG_SYSMGT1 0x10 #define ACPI_DEVFLAG_SYSMGT2 0x20 #define ACPI_DEVFLAG_LINT0 0x40 #define ACPI_DEVFLAG_LINT1 0x80 #define ACPI_DEVFLAG_ATSDIS 0x10000000 struct ivhd_header { u8 type; u8 flags; u16 length; u16 devid; u16 cap_ptr; u64 mmio_phys; u16 pci_seg; u16 info; u32 reserved; } __attribute__((packed)); struct ivhd_entry { u8 type; u16 devid; u8 flags; u32 ext; } __attribute__((packed)); struct ivmd_header { u8 type; u8 flags; u16 length; u16 devid; u16 aux; u64 resv; u64 range_start; u64 range_length; } __attribute__((packed)); static int __initdata amd_iommu_disable; u16 amd_iommu_last_bdf; struct list_head amd_iommu_unity_map; unsigned amd_iommu_aperture_order = 26; int amd_iommu_isolate; struct list_head amd_iommu_list; struct dev_table_entry *amd_iommu_dev_table; u16 *amd_iommu_alias_table; struct amd_iommu **amd_iommu_rlookup_table; struct protection_domain **amd_iommu_pd_table; unsigned long *amd_iommu_pd_alloc_bitmap; static u32 dev_table_size; static u32 alias_table_size; static u32 rlookup_table_size; static void __init iommu_set_exclusion_range(struct amd_iommu *iommu) { u64 start = iommu->exclusion_start & PAGE_MASK; u64 limit = (start + iommu->exclusion_length) & PAGE_MASK; u64 entry; if (!iommu->exclusion_start) return; entry = start | MMIO_EXCL_ENABLE_MASK; memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET, &entry, sizeof(entry)); entry = limit; memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET, &entry, sizeof(entry)); } static void __init iommu_set_device_table(struct amd_iommu *iommu) { u32 entry; BUG_ON(iommu->mmio_base == NULL); entry = virt_to_phys(amd_iommu_dev_table); entry |= (dev_table_size >> 12) - 1; memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET, &entry, sizeof(entry)); } static void __init iommu_feature_enable(struct amd_iommu *iommu, u8 bit) { u32 ctrl; ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET); ctrl |= (1 << bit); writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); } static void __init iommu_feature_disable(struct amd_iommu *iommu, u8 bit) { u32 ctrl; ctrl = (u64)readl(iommu->mmio_base + MMIO_CONTROL_OFFSET); ctrl &= ~(1 << bit); writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); } void __init iommu_enable(struct amd_iommu *iommu) { u32 ctrl; printk(KERN_INFO "AMD IOMMU: Enabling IOMMU at "); print_devid(iommu->devid, 0); printk(" cap 0x%hx\n", iommu->cap_ptr); iommu_feature_enable(iommu, CONTROL_IOMMU_EN); ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET); } static u8 * __init iommu_map_mmio_space(u64 address) { u8 *ret; if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) return NULL; ret = ioremap_nocache(address, MMIO_REGION_LENGTH); if (ret != NULL) return ret; release_mem_region(address, MMIO_REGION_LENGTH); return NULL; } static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu) { if (iommu->mmio_base) iounmap(iommu->mmio_base); release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH); } static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr) { u32 cap; cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET); UPDATE_LAST_BDF(DEVID(MMIO_GET_BUS(cap), MMIO_GET_LD(cap))); return 0; } static int __init find_last_devid_from_ivhd(struct ivhd_header *h) { u8 *p = (void *)h, *end = (void *)h; struct ivhd_entry *dev; p += sizeof(*h); end += h->length; find_last_devid_on_pci(PCI_BUS(h->devid), PCI_SLOT(h->devid), PCI_FUNC(h->devid), h->cap_ptr); while (p < end) { dev = (struct ivhd_entry *)p; switch (dev->type) { case IVHD_DEV_SELECT: case IVHD_DEV_RANGE_END: case IVHD_DEV_ALIAS: case IVHD_DEV_EXT_SELECT: UPDATE_LAST_BDF(dev->devid); break; default: break; } p += 0x04 << (*p >> 6); } WARN_ON(p != end); return 0; } static int __init find_last_devid_acpi(struct acpi_table_header *table) { int i; u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table; struct ivhd_header *h; /* * Validate checksum here so we don't need to do it when * we actually parse the table */ for (i = 0; i < table->length; ++i) checksum += p[i]; if (checksum != 0) /* ACPI table corrupt */ return -ENODEV; p += IVRS_HEADER_LENGTH; end += table->length; while (p < end) { h = (struct ivhd_header *)p; switch (h->type) { case ACPI_IVHD_TYPE: find_last_devid_from_ivhd(h); break; default: break; } p += h->length; } WARN_ON(p != end); return 0; } static u8 * __init alloc_command_buffer(struct amd_iommu *iommu) { u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL, get_order(CMD_BUFFER_SIZE)); u64 entry = 0; if (cmd_buf == NULL) return NULL; iommu->cmd_buf_size = CMD_BUFFER_SIZE; memset(cmd_buf, 0, CMD_BUFFER_SIZE); entry = (u64)virt_to_phys(cmd_buf); entry |= MMIO_CMD_SIZE_512; memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, &entry, sizeof(entry)); iommu_feature_enable(iommu, CONTROL_CMDBUF_EN); return cmd_buf; } static void __init free_command_buffer(struct amd_iommu *iommu) { if (iommu->cmd_buf) free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE)); }