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qemu/hw/i386/amd_iommu.h
David Kiarie d29a09ca68 hw/i386: Introduce AMD IOMMU 
Add AMD IOMMU emulaton to Qemu in addition to Intel IOMMU.
The IOMMU does basic translation, error checking and has a
minimal IOTLB implementation. This IOMMU bypassed the need
for target aborts by responding with IOMMU_NONE access rights
and exempts the region 0xfee00000-0xfeefffff from translation
as it is the q35 interrupt region.

We advertise features that are not yet implemented to please
the Linux IOMMU driver.

IOTLB aims at implementing commands on real IOMMUs which is
essential for debugging and may not offer any performance
benefits

Signed-off-by: David Kiarie <davidkiarie4@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2016-09-24 01:02:00 +03:00

290 lines
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/*
* QEMU emulation of an AMD IOMMU (AMD-Vi)
*
* Copyright (C) 2011 Eduard - Gabriel Munteanu
* Copyright (C) 2015 David Kiarie, <davidkiarie4@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef AMD_IOMMU_H_
#define AMD_IOMMU_H_
#include "hw/hw.h"
#include "hw/pci/pci.h"
#include "hw/pci/msi.h"
#include "hw/sysbus.h"
#include "sysemu/dma.h"
#include "hw/i386/pc.h"
#include "hw/pci/pci_bus.h"
#include "hw/i386/x86-iommu.h"
/* Capability registers */
#define AMDVI_CAPAB_BAR_LOW 0x04
#define AMDVI_CAPAB_BAR_HIGH 0x08
#define AMDVI_CAPAB_RANGE 0x0C
#define AMDVI_CAPAB_MISC 0x10
#define AMDVI_CAPAB_SIZE 0x18
#define AMDVI_CAPAB_REG_SIZE 0x04
/* Capability header data */
#define AMDVI_CAPAB_ID_SEC 0xf
#define AMDVI_CAPAB_FLAT_EXT (1 << 28)
#define AMDVI_CAPAB_EFR_SUP (1 << 27)
#define AMDVI_CAPAB_FLAG_NPCACHE (1 << 26)
#define AMDVI_CAPAB_FLAG_HTTUNNEL (1 << 25)
#define AMDVI_CAPAB_FLAG_IOTLBSUP (1 << 24)
#define AMDVI_CAPAB_INIT_TYPE (3 << 16)
/* No. of used MMIO registers */
#define AMDVI_MMIO_REGS_HIGH 8
#define AMDVI_MMIO_REGS_LOW 7
/* MMIO registers */
#define AMDVI_MMIO_DEVICE_TABLE 0x0000
#define AMDVI_MMIO_COMMAND_BASE 0x0008
#define AMDVI_MMIO_EVENT_BASE 0x0010
#define AMDVI_MMIO_CONTROL 0x0018
#define AMDVI_MMIO_EXCL_BASE 0x0020
#define AMDVI_MMIO_EXCL_LIMIT 0x0028
#define AMDVI_MMIO_EXT_FEATURES 0x0030
#define AMDVI_MMIO_COMMAND_HEAD 0x2000
#define AMDVI_MMIO_COMMAND_TAIL 0x2008
#define AMDVI_MMIO_EVENT_HEAD 0x2010
#define AMDVI_MMIO_EVENT_TAIL 0x2018
#define AMDVI_MMIO_STATUS 0x2020
#define AMDVI_MMIO_PPR_BASE 0x0038
#define AMDVI_MMIO_PPR_HEAD 0x2030
#define AMDVI_MMIO_PPR_TAIL 0x2038
#define AMDVI_MMIO_SIZE 0x4000
#define AMDVI_MMIO_DEVTAB_SIZE_MASK ((1ULL << 12) - 1)
#define AMDVI_MMIO_DEVTAB_BASE_MASK (((1ULL << 52) - 1) & ~ \
AMDVI_MMIO_DEVTAB_SIZE_MASK)
#define AMDVI_MMIO_DEVTAB_ENTRY_SIZE 32
#define AMDVI_MMIO_DEVTAB_SIZE_UNIT 4096
/* some of this are similar but just for readability */
#define AMDVI_MMIO_CMDBUF_SIZE_BYTE (AMDVI_MMIO_COMMAND_BASE + 7)
#define AMDVI_MMIO_CMDBUF_SIZE_MASK 0x0f
#define AMDVI_MMIO_CMDBUF_BASE_MASK AMDVI_MMIO_DEVTAB_BASE_MASK
#define AMDVI_MMIO_CMDBUF_HEAD_MASK (((1ULL << 19) - 1) & ~0x0f)
#define AMDVI_MMIO_CMDBUF_TAIL_MASK AMDVI_MMIO_EVTLOG_HEAD_MASK
#define AMDVI_MMIO_EVTLOG_SIZE_BYTE (AMDVI_MMIO_EVENT_BASE + 7)
#define AMDVI_MMIO_EVTLOG_SIZE_MASK AMDVI_MMIO_CMDBUF_SIZE_MASK
#define AMDVI_MMIO_EVTLOG_BASE_MASK AMDVI_MMIO_CMDBUF_BASE_MASK
#define AMDVI_MMIO_EVTLOG_HEAD_MASK (((1ULL << 19) - 1) & ~0x0f)
#define AMDVI_MMIO_EVTLOG_TAIL_MASK AMDVI_MMIO_EVTLOG_HEAD_MASK
#define AMDVI_MMIO_PPRLOG_SIZE_BYTE (AMDVI_MMIO_EVENT_BASE + 7)
#define AMDVI_MMIO_PPRLOG_HEAD_MASK AMDVI_MMIO_EVTLOG_HEAD_MASK
#define AMDVI_MMIO_PPRLOG_TAIL_MASK AMDVI_MMIO_EVTLOG_HEAD_MASK
#define AMDVI_MMIO_PPRLOG_BASE_MASK AMDVI_MMIO_EVTLOG_BASE_MASK
#define AMDVI_MMIO_PPRLOG_SIZE_MASK AMDVI_MMIO_EVTLOG_SIZE_MASK
#define AMDVI_MMIO_EXCL_ENABLED_MASK (1ULL << 0)
#define AMDVI_MMIO_EXCL_ALLOW_MASK (1ULL << 1)
#define AMDVI_MMIO_EXCL_LIMIT_MASK AMDVI_MMIO_DEVTAB_BASE_MASK
#define AMDVI_MMIO_EXCL_LIMIT_LOW 0xfff
/* mmio control register flags */
#define AMDVI_MMIO_CONTROL_AMDVIEN (1ULL << 0)
#define AMDVI_MMIO_CONTROL_HTTUNEN (1ULL << 1)
#define AMDVI_MMIO_CONTROL_EVENTLOGEN (1ULL << 2)
#define AMDVI_MMIO_CONTROL_EVENTINTEN (1ULL << 3)
#define AMDVI_MMIO_CONTROL_COMWAITINTEN (1ULL << 4)
#define AMDVI_MMIO_CONTROL_CMDBUFLEN (1ULL << 12)
/* MMIO status register bits */
#define AMDVI_MMIO_STATUS_CMDBUF_RUN (1 << 4)
#define AMDVI_MMIO_STATUS_EVT_RUN (1 << 3)
#define AMDVI_MMIO_STATUS_COMP_INT (1 << 2)
#define AMDVI_MMIO_STATUS_EVT_OVF (1 << 0)
#define AMDVI_CMDBUF_ID_BYTE 0x07
#define AMDVI_CMDBUF_ID_RSHIFT 4
#define AMDVI_CMD_COMPLETION_WAIT 0x01
#define AMDVI_CMD_INVAL_DEVTAB_ENTRY 0x02
#define AMDVI_CMD_INVAL_AMDVI_PAGES 0x03
#define AMDVI_CMD_INVAL_IOTLB_PAGES 0x04
#define AMDVI_CMD_INVAL_INTR_TABLE 0x05
#define AMDVI_CMD_PREFETCH_AMDVI_PAGES 0x06
#define AMDVI_CMD_COMPLETE_PPR_REQUEST 0x07
#define AMDVI_CMD_INVAL_AMDVI_ALL 0x08
#define AMDVI_DEVTAB_ENTRY_SIZE 32
/* Device table entry bits 0:63 */
#define AMDVI_DEV_VALID (1ULL << 0)
#define AMDVI_DEV_TRANSLATION_VALID (1ULL << 1)
#define AMDVI_DEV_MODE_MASK 0x7
#define AMDVI_DEV_MODE_RSHIFT 9
#define AMDVI_DEV_PT_ROOT_MASK 0xffffffffff000
#define AMDVI_DEV_PT_ROOT_RSHIFT 12
#define AMDVI_DEV_PERM_SHIFT 61
#define AMDVI_DEV_PERM_READ (1ULL << 61)
#define AMDVI_DEV_PERM_WRITE (1ULL << 62)
/* Device table entry bits 64:127 */
#define AMDVI_DEV_DOMID_ID_MASK ((1ULL << 16) - 1)
/* Event codes and flags, as stored in the info field */
#define AMDVI_EVENT_ILLEGAL_DEVTAB_ENTRY (0x1U << 12)
#define AMDVI_EVENT_IOPF (0x2U << 12)
#define AMDVI_EVENT_IOPF_I (1U << 3)
#define AMDVI_EVENT_DEV_TAB_HW_ERROR (0x3U << 12)
#define AMDVI_EVENT_PAGE_TAB_HW_ERROR (0x4U << 12)
#define AMDVI_EVENT_ILLEGAL_COMMAND_ERROR (0x5U << 12)
#define AMDVI_EVENT_COMMAND_HW_ERROR (0x6U << 12)
#define AMDVI_EVENT_LEN 16
#define AMDVI_PERM_READ (1 << 0)
#define AMDVI_PERM_WRITE (1 << 1)
#define AMDVI_FEATURE_PREFETCH (1ULL << 0) /* page prefetch */
#define AMDVI_FEATURE_PPR (1ULL << 1) /* PPR Support */
#define AMDVI_FEATURE_GT (1ULL << 4) /* Guest Translation */
#define AMDVI_FEATURE_IA (1ULL << 6) /* inval all support */
#define AMDVI_FEATURE_GA (1ULL << 7) /* guest VAPIC support */
#define AMDVI_FEATURE_HE (1ULL << 8) /* hardware error regs */
#define AMDVI_FEATURE_PC (1ULL << 9) /* Perf counters */
/* reserved DTE bits */
#define AMDVI_DTE_LOWER_QUAD_RESERVED 0x80300000000000fc
#define AMDVI_DTE_MIDDLE_QUAD_RESERVED 0x0000000000000100
#define AMDVI_DTE_UPPER_QUAD_RESERVED 0x08f0000000000000
/* AMDVI paging mode */
#define AMDVI_GATS_MODE (6ULL << 12)
#define AMDVI_HATS_MODE (6ULL << 10)
/* IOTLB */
#define AMDVI_IOTLB_MAX_SIZE 1024
#define AMDVI_DEVID_SHIFT 36
/* extended feature support */
#define AMDVI_EXT_FEATURES (AMDVI_FEATURE_PREFETCH | AMDVI_FEATURE_PPR | \
AMDVI_FEATURE_IA | AMDVI_FEATURE_GT | AMDVI_FEATURE_HE | \
AMDVI_GATS_MODE | AMDVI_HATS_MODE)
/* capabilities header */
#define AMDVI_CAPAB_FEATURES (AMDVI_CAPAB_FLAT_EXT | \
AMDVI_CAPAB_FLAG_NPCACHE | AMDVI_CAPAB_FLAG_IOTLBSUP \
| AMDVI_CAPAB_ID_SEC | AMDVI_CAPAB_INIT_TYPE | \
AMDVI_CAPAB_FLAG_HTTUNNEL | AMDVI_CAPAB_EFR_SUP)
/* AMDVI default address */
#define AMDVI_BASE_ADDR 0xfed80000
/* page management constants */
#define AMDVI_PAGE_SHIFT 12
#define AMDVI_PAGE_SIZE (1ULL << AMDVI_PAGE_SHIFT)
#define AMDVI_PAGE_SHIFT_4K 12
#define AMDVI_PAGE_MASK_4K (~((1ULL << AMDVI_PAGE_SHIFT_4K) - 1))
#define AMDVI_MAX_VA_ADDR (48UL << 5)
#define AMDVI_MAX_PH_ADDR (40UL << 8)
#define AMDVI_MAX_GVA_ADDR (48UL << 15)
/* Completion Wait data size */
#define AMDVI_COMPLETION_DATA_SIZE 8
#define AMDVI_COMMAND_SIZE 16
/* Completion Wait data size */
#define AMDVI_COMPLETION_DATA_SIZE 8
#define AMDVI_COMMAND_SIZE 16
#define AMDVI_INT_ADDR_FIRST 0xfee00000
#define AMDVI_INT_ADDR_LAST 0xfeefffff
#define TYPE_AMD_IOMMU_DEVICE "amd-iommu"
#define AMD_IOMMU_DEVICE(obj)\
OBJECT_CHECK(AMDVIState, (obj), TYPE_AMD_IOMMU_DEVICE)
#define TYPE_AMD_IOMMU_PCI "AMDVI-PCI"
typedef struct AMDVIAddressSpace AMDVIAddressSpace;
/* functions to steal PCI config space */
typedef struct AMDVIPCIState {
PCIDevice dev; /* The PCI device itself */
} AMDVIPCIState;
typedef struct AMDVIState {
X86IOMMUState iommu; /* IOMMU bus device */
AMDVIPCIState pci; /* IOMMU PCI device */
uint32_t version;
uint32_t capab_offset; /* capability offset pointer */
uint64_t mmio_addr;
uint32_t devid; /* auto-assigned devid */
bool enabled; /* IOMMU enabled */
bool ats_enabled; /* address translation enabled */
bool cmdbuf_enabled; /* command buffer enabled */
bool evtlog_enabled; /* event log enabled */
bool excl_enabled;
hwaddr devtab; /* base address device table */
size_t devtab_len; /* device table length */
hwaddr cmdbuf; /* command buffer base address */
uint64_t cmdbuf_len; /* command buffer length */
uint32_t cmdbuf_head; /* current IOMMU read position */
uint32_t cmdbuf_tail; /* next Software write position */
bool completion_wait_intr;
hwaddr evtlog; /* base address event log */
bool evtlog_intr;
uint32_t evtlog_len; /* event log length */
uint32_t evtlog_head; /* current IOMMU write position */
uint32_t evtlog_tail; /* current Software read position */
/* unused for now */
hwaddr excl_base; /* base DVA - IOMMU exclusion range */
hwaddr excl_limit; /* limit of IOMMU exclusion range */
bool excl_allow; /* translate accesses to the exclusion range */
bool excl_enable; /* exclusion range enabled */
hwaddr ppr_log; /* base address ppr log */
uint32_t pprlog_len; /* ppr log len */
uint32_t pprlog_head; /* ppr log head */
uint32_t pprlog_tail; /* ppr log tail */
MemoryRegion mmio; /* MMIO region */
uint8_t mmior[AMDVI_MMIO_SIZE]; /* read/write MMIO */
uint8_t w1cmask[AMDVI_MMIO_SIZE]; /* read/write 1 clear mask */
uint8_t romask[AMDVI_MMIO_SIZE]; /* MMIO read/only mask */
bool mmio_enabled;
/* IOMMU function */
MemoryRegionIOMMUOps iommu_ops;
/* for each served device */
AMDVIAddressSpace **address_spaces[PCI_BUS_MAX];
/* IOTLB */
GHashTable *iotlb;
} AMDVIState;
#endif
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