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qemu/hw/vfio/pci-quirks.c
Alexey Kardashevskiy ec132efaa8 spapr: Support NVIDIA V100 GPU with NVLink2 
NVIDIA V100 GPUs have on-board RAM which is mapped into the host memory
space and accessible as normal RAM via an NVLink bus. The VFIO-PCI driver
implements special regions for such GPUs and emulates an NVLink bridge.
NVLink2-enabled POWER9 CPUs also provide address translation services
which includes an ATS shootdown (ATSD) register exported via the NVLink
bridge device.

This adds a quirk to VFIO to map the GPU memory and create an MR;
the new MR is stored in a PCI device as a QOM link. The sPAPR PCI uses
this to get the MR and map it to the system address space.
Another quirk does the same for ATSD.

This adds additional steps to sPAPR PHB setup:

1. Search for specific GPUs and NPUs, collect findings in
sPAPRPHBState::nvgpus, manage system address space mappings;

2. Add device-specific properties such as "ibm,npu", "ibm,gpu",
"memory-block", "link-speed" to advertise the NVLink2 function to
the guest;

3. Add "mmio-atsd" to vPHB to advertise the ATSD capability;

4. Add new memory blocks (with extra "linux,memory-usable" to prevent
the guest OS from accessing the new memory until it is onlined) and
npuphb# nodes representing an NPU unit for every vPHB as the GPU driver
uses it for link discovery.

This allocates space for GPU RAM and ATSD like we do for MMIOs by
adding 2 new parameters to the phb_placement() hook. Older machine types
set these to zero.

This puts new memory nodes in a separate NUMA node to as the GPU RAM
needs to be configured equally distant from any other node in the system.
Unlike the host setup which assigns numa ids from 255 downwards, this
adds new NUMA nodes after the user configures nodes or from 1 if none
were configured.

This adds requirement similar to EEH - one IOMMU group per vPHB.
The reason for this is that ATSD registers belong to a physical NPU
so they cannot invalidate translations on GPUs attached to another NPU.
It is guaranteed by the host platform as it does not mix NVLink bridges
or GPUs from different NPU in the same IOMMU group. If more than one
IOMMU group is detected on a vPHB, this disables ATSD support for that
vPHB and prints a warning.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
[aw: for vfio portions]
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Message-Id: <20190312082103.130561-1-aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2019-04-26 10:41:23 +10:00

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/*
* device quirks for PCI devices
*
* Copyright Red Hat, Inc. 2012-2015
*
* Authors:
* Alex Williamson <alex.williamson@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qemu/error-report.h"
#include "qemu/main-loop.h"
#include "qemu/range.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include <sys/ioctl.h>
#include "hw/nvram/fw_cfg.h"
#include "pci.h"
#include "trace.h"
/* Use uin32_t for vendor & device so PCI_ANY_ID expands and cannot match hw */
static bool vfio_pci_is(VFIOPCIDevice *vdev, uint32_t vendor, uint32_t device)
{
return (vendor == PCI_ANY_ID || vendor == vdev->vendor_id) &&
(device == PCI_ANY_ID || device == vdev->device_id);
}
static bool vfio_is_vga(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
uint16_t class = pci_get_word(pdev->config + PCI_CLASS_DEVICE);
return class == PCI_CLASS_DISPLAY_VGA;
}
/*
* List of device ids/vendor ids for which to disable
* option rom loading. This avoids the guest hangs during rom
* execution as noticed with the BCM 57810 card for lack of a
* more better way to handle such issues.
* The user can still override by specifying a romfile or
* rombar=1.
* Please see https://bugs.launchpad.net/qemu/+bug/1284874
* for an analysis of the 57810 card hang. When adding
* a new vendor id/device id combination below, please also add
* your card/environment details and information that could
* help in debugging to the bug tracking this issue
*/
static const struct {
uint32_t vendor;
uint32_t device;
} romblacklist[] = {
{ 0x14e4, 0x168e }, /* Broadcom BCM 57810 */
};
bool vfio_blacklist_opt_rom(VFIOPCIDevice *vdev)
{
int i;
for (i = 0 ; i < ARRAY_SIZE(romblacklist); i++) {
if (vfio_pci_is(vdev, romblacklist[i].vendor, romblacklist[i].device)) {
trace_vfio_quirk_rom_blacklisted(vdev->vbasedev.name,
romblacklist[i].vendor,
romblacklist[i].device);
return true;
}
}
return false;
}
/*
* Device specific region quirks (mostly backdoors to PCI config space)
*/
/*
* The generic window quirks operate on an address and data register,
* vfio_generic_window_address_quirk handles the address register and
* vfio_generic_window_data_quirk handles the data register. These ops
* pass reads and writes through to hardware until a value matching the
* stored address match/mask is written. When this occurs, the data
* register access emulated PCI config space for the device rather than
* passing through accesses. This enables devices where PCI config space
* is accessible behind a window register to maintain the virtualization
* provided through vfio.
*/
typedef struct VFIOConfigWindowMatch {
uint32_t match;
uint32_t mask;
} VFIOConfigWindowMatch;
typedef struct VFIOConfigWindowQuirk {
struct VFIOPCIDevice *vdev;
uint32_t address_val;
uint32_t address_offset;
uint32_t data_offset;
bool window_enabled;
uint8_t bar;
MemoryRegion *addr_mem;
MemoryRegion *data_mem;
uint32_t nr_matches;
VFIOConfigWindowMatch matches[];
} VFIOConfigWindowQuirk;
static uint64_t vfio_generic_window_quirk_address_read(void *opaque,
hwaddr addr,
unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
return vfio_region_read(&vdev->bars[window->bar].region,
addr + window->address_offset, size);
}
static void vfio_generic_window_quirk_address_write(void *opaque, hwaddr addr,
uint64_t data,
unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
int i;
window->window_enabled = false;
vfio_region_write(&vdev->bars[window->bar].region,
addr + window->address_offset, data, size);
for (i = 0; i < window->nr_matches; i++) {
if ((data & ~window->matches[i].mask) == window->matches[i].match) {
window->window_enabled = true;
window->address_val = data & window->matches[i].mask;
trace_vfio_quirk_generic_window_address_write(vdev->vbasedev.name,
memory_region_name(window->addr_mem), data);
break;
}
}
}
static const MemoryRegionOps vfio_generic_window_address_quirk = {
.read = vfio_generic_window_quirk_address_read,
.write = vfio_generic_window_quirk_address_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_generic_window_quirk_data_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
uint64_t data;
/* Always read data reg, discard if window enabled */
data = vfio_region_read(&vdev->bars[window->bar].region,
addr + window->data_offset, size);
if (window->window_enabled) {
data = vfio_pci_read_config(&vdev->pdev, window->address_val, size);
trace_vfio_quirk_generic_window_data_read(vdev->vbasedev.name,
memory_region_name(window->data_mem), data);
}
return data;
}
static void vfio_generic_window_quirk_data_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOConfigWindowQuirk *window = opaque;
VFIOPCIDevice *vdev = window->vdev;
if (window->window_enabled) {
vfio_pci_write_config(&vdev->pdev, window->address_val, data, size);
trace_vfio_quirk_generic_window_data_write(vdev->vbasedev.name,
memory_region_name(window->data_mem), data);
return;
}
vfio_region_write(&vdev->bars[window->bar].region,
addr + window->data_offset, data, size);
}
static const MemoryRegionOps vfio_generic_window_data_quirk = {
.read = vfio_generic_window_quirk_data_read,
.write = vfio_generic_window_quirk_data_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/*
* The generic mirror quirk handles devices which expose PCI config space
* through a region within a BAR. When enabled, reads and writes are
* redirected through to emulated PCI config space. XXX if PCI config space
* used memory regions, this could just be an alias.
*/
typedef struct VFIOConfigMirrorQuirk {
struct VFIOPCIDevice *vdev;
uint32_t offset;
uint8_t bar;
MemoryRegion *mem;
uint8_t data[];
} VFIOConfigMirrorQuirk;
static uint64_t vfio_generic_quirk_mirror_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
uint64_t data;
/* Read and discard in case the hardware cares */
(void)vfio_region_read(&vdev->bars[mirror->bar].region,
addr + mirror->offset, size);
data = vfio_pci_read_config(&vdev->pdev, addr, size);
trace_vfio_quirk_generic_mirror_read(vdev->vbasedev.name,
memory_region_name(mirror->mem),
addr, data);
return data;
}
static void vfio_generic_quirk_mirror_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
vfio_pci_write_config(&vdev->pdev, addr, data, size);
trace_vfio_quirk_generic_mirror_write(vdev->vbasedev.name,
memory_region_name(mirror->mem),
addr, data);
}
static const MemoryRegionOps vfio_generic_mirror_quirk = {
.read = vfio_generic_quirk_mirror_read,
.write = vfio_generic_quirk_mirror_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
/* Is range1 fully contained within range2? */
static bool vfio_range_contained(uint64_t first1, uint64_t len1,
uint64_t first2, uint64_t len2) {
return (first1 >= first2 && first1 + len1 <= first2 + len2);
}
#define PCI_VENDOR_ID_ATI 0x1002
/*
* Radeon HD cards (HD5450 & HD7850) report the upper byte of the I/O port BAR
* through VGA register 0x3c3. On newer cards, the I/O port BAR is always
* BAR4 (older cards like the X550 used BAR1, but we don't care to support
* those). Note that on bare metal, a read of 0x3c3 doesn't always return the
* I/O port BAR address. Originally this was coded to return the virtual BAR
* address only if the physical register read returns the actual BAR address,
* but users have reported greater success if we return the virtual address
* unconditionally.
*/
static uint64_t vfio_ati_3c3_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOPCIDevice *vdev = opaque;
uint64_t data = vfio_pci_read_config(&vdev->pdev,
PCI_BASE_ADDRESS_4 + 1, size);
trace_vfio_quirk_ati_3c3_read(vdev->vbasedev.name, data);
return data;
}
static const MemoryRegionOps vfio_ati_3c3_quirk = {
.read = vfio_ati_3c3_quirk_read,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static VFIOQuirk *vfio_quirk_alloc(int nr_mem)
{
VFIOQuirk *quirk = g_new0(VFIOQuirk, 1);
QLIST_INIT(&quirk->ioeventfds);
quirk->mem = g_new0(MemoryRegion, nr_mem);
quirk->nr_mem = nr_mem;
return quirk;
}
static void vfio_ioeventfd_exit(VFIOPCIDevice *vdev, VFIOIOEventFD *ioeventfd)
{
QLIST_REMOVE(ioeventfd, next);
memory_region_del_eventfd(ioeventfd->mr, ioeventfd->addr, ioeventfd->size,
true, ioeventfd->data, &ioeventfd->e);
if (ioeventfd->vfio) {
struct vfio_device_ioeventfd vfio_ioeventfd;
vfio_ioeventfd.argsz = sizeof(vfio_ioeventfd);
vfio_ioeventfd.flags = ioeventfd->size;
vfio_ioeventfd.data = ioeventfd->data;
vfio_ioeventfd.offset = ioeventfd->region->fd_offset +
ioeventfd->region_addr;
vfio_ioeventfd.fd = -1;
if (ioctl(vdev->vbasedev.fd, VFIO_DEVICE_IOEVENTFD, &vfio_ioeventfd)) {
error_report("Failed to remove vfio ioeventfd for %s+0x%"
HWADDR_PRIx"[%d]:0x%"PRIx64" (%m)",
memory_region_name(ioeventfd->mr), ioeventfd->addr,
ioeventfd->size, ioeventfd->data);
}
} else {
qemu_set_fd_handler(event_notifier_get_fd(&ioeventfd->e),
NULL, NULL, NULL);
}
event_notifier_cleanup(&ioeventfd->e);
trace_vfio_ioeventfd_exit(memory_region_name(ioeventfd->mr),
(uint64_t)ioeventfd->addr, ioeventfd->size,
ioeventfd->data);
g_free(ioeventfd);
}
static void vfio_drop_dynamic_eventfds(VFIOPCIDevice *vdev, VFIOQuirk *quirk)
{
VFIOIOEventFD *ioeventfd, *tmp;
QLIST_FOREACH_SAFE(ioeventfd, &quirk->ioeventfds, next, tmp) {
if (ioeventfd->dynamic) {
vfio_ioeventfd_exit(vdev, ioeventfd);
}
}
}
static void vfio_ioeventfd_handler(void *opaque)
{
VFIOIOEventFD *ioeventfd = opaque;
if (event_notifier_test_and_clear(&ioeventfd->e)) {
vfio_region_write(ioeventfd->region, ioeventfd->region_addr,
ioeventfd->data, ioeventfd->size);
trace_vfio_ioeventfd_handler(memory_region_name(ioeventfd->mr),
(uint64_t)ioeventfd->addr, ioeventfd->size,
ioeventfd->data);
}
}
static VFIOIOEventFD *vfio_ioeventfd_init(VFIOPCIDevice *vdev,
MemoryRegion *mr, hwaddr addr,
unsigned size, uint64_t data,
VFIORegion *region,
hwaddr region_addr, bool dynamic)
{
VFIOIOEventFD *ioeventfd;
if (vdev->no_kvm_ioeventfd) {
return NULL;
}
ioeventfd = g_malloc0(sizeof(*ioeventfd));
if (event_notifier_init(&ioeventfd->e, 0)) {
g_free(ioeventfd);
return NULL;
}
/*
* MemoryRegion and relative offset, plus additional ioeventfd setup
* parameters for configuring and later tearing down KVM ioeventfd.
*/
ioeventfd->mr = mr;
ioeventfd->addr = addr;
ioeventfd->size = size;
ioeventfd->data = data;
ioeventfd->dynamic = dynamic;
/*
* VFIORegion and relative offset for implementing the userspace
* handler. data & size fields shared for both uses.
*/
ioeventfd->region = region;
ioeventfd->region_addr = region_addr;
if (!vdev->no_vfio_ioeventfd) {
struct vfio_device_ioeventfd vfio_ioeventfd;
vfio_ioeventfd.argsz = sizeof(vfio_ioeventfd);
vfio_ioeventfd.flags = ioeventfd->size;
vfio_ioeventfd.data = ioeventfd->data;
vfio_ioeventfd.offset = ioeventfd->region->fd_offset +
ioeventfd->region_addr;
vfio_ioeventfd.fd = event_notifier_get_fd(&ioeventfd->e);
ioeventfd->vfio = !ioctl(vdev->vbasedev.fd,
VFIO_DEVICE_IOEVENTFD, &vfio_ioeventfd);
}
if (!ioeventfd->vfio) {
qemu_set_fd_handler(event_notifier_get_fd(&ioeventfd->e),
vfio_ioeventfd_handler, NULL, ioeventfd);
}
memory_region_add_eventfd(ioeventfd->mr, ioeventfd->addr, ioeventfd->size,
true, ioeventfd->data, &ioeventfd->e);
trace_vfio_ioeventfd_init(memory_region_name(mr), (uint64_t)addr,
size, data, ioeventfd->vfio);
return ioeventfd;
}
static void vfio_vga_probe_ati_3c3_quirk(VFIOPCIDevice *vdev)
{
VFIOQuirk *quirk;
/*
* As long as the BAR is >= 256 bytes it will be aligned such that the
* lower byte is always zero. Filter out anything else, if it exists.
*/
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
!vdev->bars[4].ioport || vdev->bars[4].region.size < 256) {
return;
}
quirk = vfio_quirk_alloc(1);
memory_region_init_io(quirk->mem, OBJECT(vdev), &vfio_ati_3c3_quirk, vdev,
"vfio-ati-3c3-quirk", 1);
memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem,
3 /* offset 3 bytes from 0x3c0 */, quirk->mem);
QLIST_INSERT_HEAD(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks,
quirk, next);
trace_vfio_quirk_ati_3c3_probe(vdev->vbasedev.name);
}
/*
* Newer ATI/AMD devices, including HD5450 and HD7850, have a mirror to PCI
* config space through MMIO BAR2 at offset 0x4000. Nothing seems to access
* the MMIO space directly, but a window to this space is provided through
* I/O port BAR4. Offset 0x0 is the address register and offset 0x4 is the
* data register. When the address is programmed to a range of 0x4000-0x4fff
* PCI configuration space is available. Experimentation seems to indicate
* that read-only may be provided by hardware.
*/
static void vfio_probe_ati_bar4_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOConfigWindowQuirk *window;
/* This windows doesn't seem to be used except by legacy VGA code */
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
!vdev->vga || nr != 4) {
return;
}
quirk = vfio_quirk_alloc(2);
window = quirk->data = g_malloc0(sizeof(*window) +
sizeof(VFIOConfigWindowMatch));
window->vdev = vdev;
window->address_offset = 0;
window->data_offset = 4;
window->nr_matches = 1;
window->matches[0].match = 0x4000;
window->matches[0].mask = vdev->config_size - 1;
window->bar = nr;
window->addr_mem = &quirk->mem[0];
window->data_mem = &quirk->mem[1];
memory_region_init_io(window->addr_mem, OBJECT(vdev),
&vfio_generic_window_address_quirk, window,
"vfio-ati-bar4-window-address-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->address_offset,
window->addr_mem, 1);
memory_region_init_io(window->data_mem, OBJECT(vdev),
&vfio_generic_window_data_quirk, window,
"vfio-ati-bar4-window-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->data_offset,
window->data_mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_ati_bar4_probe(vdev->vbasedev.name);
}
/*
* Trap the BAR2 MMIO mirror to config space as well.
*/
static void vfio_probe_ati_bar2_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOConfigMirrorQuirk *mirror;
/* Only enable on newer devices where BAR2 is 64bit */
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_ATI, PCI_ANY_ID) ||
!vdev->vga || nr != 2 || !vdev->bars[2].mem64) {
return;
}
quirk = vfio_quirk_alloc(1);
mirror = quirk->data = g_malloc0(sizeof(*mirror));
mirror->mem = quirk->mem;
mirror->vdev = vdev;
mirror->offset = 0x4000;
mirror->bar = nr;
memory_region_init_io(mirror->mem, OBJECT(vdev),
&vfio_generic_mirror_quirk, mirror,
"vfio-ati-bar2-4000-quirk", PCI_CONFIG_SPACE_SIZE);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
mirror->offset, mirror->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_ati_bar2_probe(vdev->vbasedev.name);
}
/*
* Older ATI/AMD cards like the X550 have a similar window to that above.
* I/O port BAR1 provides a window to a mirror of PCI config space located
* in BAR2 at offset 0xf00. We don't care to support such older cards, but
* note it for future reference.
*/
/*
* Nvidia has several different methods to get to config space, the
* nouveu project has several of these documented here:
* https://github.com/pathscale/envytools/tree/master/hwdocs
*
* The first quirk is actually not documented in envytools and is found
* on 10de:01d1 (NVIDIA Corporation G72 [GeForce 7300 LE]). This is an
* NV46 chipset. The backdoor uses the legacy VGA I/O ports to access
* the mirror of PCI config space found at BAR0 offset 0x1800. The access
* sequence first writes 0x338 to I/O port 0x3d4. The target offset is
* then written to 0x3d0. Finally 0x538 is written for a read and 0x738
* is written for a write to 0x3d4. The BAR0 offset is then accessible
* through 0x3d0. This quirk doesn't seem to be necessary on newer cards
* that use the I/O port BAR5 window but it doesn't hurt to leave it.
*/
typedef enum {NONE = 0, SELECT, WINDOW, READ, WRITE} VFIONvidia3d0State;
static const char *nv3d0_states[] = { "NONE", "SELECT",
"WINDOW", "READ", "WRITE" };
typedef struct VFIONvidia3d0Quirk {
VFIOPCIDevice *vdev;
VFIONvidia3d0State state;
uint32_t offset;
} VFIONvidia3d0Quirk;
static uint64_t vfio_nvidia_3d4_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
quirk->state = NONE;
return vfio_vga_read(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x14, size);
}
static void vfio_nvidia_3d4_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
VFIONvidia3d0State old_state = quirk->state;
quirk->state = NONE;
switch (data) {
case 0x338:
if (old_state == NONE) {
quirk->state = SELECT;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
}
break;
case 0x538:
if (old_state == WINDOW) {
quirk->state = READ;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
}
break;
case 0x738:
if (old_state == WINDOW) {
quirk->state = WRITE;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
}
break;
}
vfio_vga_write(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x14, data, size);
}
static const MemoryRegionOps vfio_nvidia_3d4_quirk = {
.read = vfio_nvidia_3d4_quirk_read,
.write = vfio_nvidia_3d4_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_nvidia_3d0_quirk_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
VFIONvidia3d0State old_state = quirk->state;
uint64_t data = vfio_vga_read(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x10, size);
quirk->state = NONE;
if (old_state == READ &&
(quirk->offset & ~(PCI_CONFIG_SPACE_SIZE - 1)) == 0x1800) {
uint8_t offset = quirk->offset & (PCI_CONFIG_SPACE_SIZE - 1);
data = vfio_pci_read_config(&vdev->pdev, offset, size);
trace_vfio_quirk_nvidia_3d0_read(vdev->vbasedev.name,
offset, size, data);
}
return data;
}
static void vfio_nvidia_3d0_quirk_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidia3d0Quirk *quirk = opaque;
VFIOPCIDevice *vdev = quirk->vdev;
VFIONvidia3d0State old_state = quirk->state;
quirk->state = NONE;
if (old_state == SELECT) {
quirk->offset = (uint32_t)data;
quirk->state = WINDOW;
trace_vfio_quirk_nvidia_3d0_state(vdev->vbasedev.name,
nv3d0_states[quirk->state]);
} else if (old_state == WRITE) {
if ((quirk->offset & ~(PCI_CONFIG_SPACE_SIZE - 1)) == 0x1800) {
uint8_t offset = quirk->offset & (PCI_CONFIG_SPACE_SIZE - 1);
vfio_pci_write_config(&vdev->pdev, offset, data, size);
trace_vfio_quirk_nvidia_3d0_write(vdev->vbasedev.name,
offset, data, size);
return;
}
}
vfio_vga_write(&vdev->vga->region[QEMU_PCI_VGA_IO_HI],
addr + 0x10, data, size);
}
static const MemoryRegionOps vfio_nvidia_3d0_quirk = {
.read = vfio_nvidia_3d0_quirk_read,
.write = vfio_nvidia_3d0_quirk_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_vga_probe_nvidia_3d0_quirk(VFIOPCIDevice *vdev)
{
VFIOQuirk *quirk;
VFIONvidia3d0Quirk *data;
if (vdev->no_geforce_quirks ||
!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) ||
!vdev->bars[1].region.size) {
return;
}
quirk = vfio_quirk_alloc(2);
quirk->data = data = g_malloc0(sizeof(*data));
data->vdev = vdev;
memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_nvidia_3d4_quirk,
data, "vfio-nvidia-3d4-quirk", 2);
memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem,
0x14 /* 0x3c0 + 0x14 */, &quirk->mem[0]);
memory_region_init_io(&quirk->mem[1], OBJECT(vdev), &vfio_nvidia_3d0_quirk,
data, "vfio-nvidia-3d0-quirk", 2);
memory_region_add_subregion(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].mem,
0x10 /* 0x3c0 + 0x10 */, &quirk->mem[1]);
QLIST_INSERT_HEAD(&vdev->vga->region[QEMU_PCI_VGA_IO_HI].quirks,
quirk, next);
trace_vfio_quirk_nvidia_3d0_probe(vdev->vbasedev.name);
}
/*
* The second quirk is documented in envytools. The I/O port BAR5 is just
* a set of address/data ports to the MMIO BARs. The BAR we care about is
* again BAR0. This backdoor is apparently a bit newer than the one above
* so we need to not only trap 256 bytes @0x1800, but all of PCI config
* space, including extended space is available at the 4k @0x88000.
*/
typedef struct VFIONvidiaBAR5Quirk {
uint32_t master;
uint32_t enable;
MemoryRegion *addr_mem;
MemoryRegion *data_mem;
bool enabled;
VFIOConfigWindowQuirk window; /* last for match data */
} VFIONvidiaBAR5Quirk;
static void vfio_nvidia_bar5_enable(VFIONvidiaBAR5Quirk *bar5)
{
VFIOPCIDevice *vdev = bar5->window.vdev;
if (((bar5->master & bar5->enable) & 0x1) == bar5->enabled) {
return;
}
bar5->enabled = !bar5->enabled;
trace_vfio_quirk_nvidia_bar5_state(vdev->vbasedev.name,
bar5->enabled ? "Enable" : "Disable");
memory_region_set_enabled(bar5->addr_mem, bar5->enabled);
memory_region_set_enabled(bar5->data_mem, bar5->enabled);
}
static uint64_t vfio_nvidia_bar5_quirk_master_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
return vfio_region_read(&vdev->bars[5].region, addr, size);
}
static void vfio_nvidia_bar5_quirk_master_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
vfio_region_write(&vdev->bars[5].region, addr, data, size);
bar5->master = data;
vfio_nvidia_bar5_enable(bar5);
}
static const MemoryRegionOps vfio_nvidia_bar5_quirk_master = {
.read = vfio_nvidia_bar5_quirk_master_read,
.write = vfio_nvidia_bar5_quirk_master_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_nvidia_bar5_quirk_enable_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
return vfio_region_read(&vdev->bars[5].region, addr + 4, size);
}
static void vfio_nvidia_bar5_quirk_enable_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIONvidiaBAR5Quirk *bar5 = opaque;
VFIOPCIDevice *vdev = bar5->window.vdev;
vfio_region_write(&vdev->bars[5].region, addr + 4, data, size);
bar5->enable = data;
vfio_nvidia_bar5_enable(bar5);
}
static const MemoryRegionOps vfio_nvidia_bar5_quirk_enable = {
.read = vfio_nvidia_bar5_quirk_enable_read,
.write = vfio_nvidia_bar5_quirk_enable_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_nvidia_bar5_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIONvidiaBAR5Quirk *bar5;
VFIOConfigWindowQuirk *window;
if (vdev->no_geforce_quirks ||
!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) ||
!vdev->vga || nr != 5 || !vdev->bars[5].ioport) {
return;
}
quirk = vfio_quirk_alloc(4);
bar5 = quirk->data = g_malloc0(sizeof(*bar5) +
(sizeof(VFIOConfigWindowMatch) * 2));
window = &bar5->window;
window->vdev = vdev;
window->address_offset = 0x8;
window->data_offset = 0xc;
window->nr_matches = 2;
window->matches[0].match = 0x1800;
window->matches[0].mask = PCI_CONFIG_SPACE_SIZE - 1;
window->matches[1].match = 0x88000;
window->matches[1].mask = vdev->config_size - 1;
window->bar = nr;
window->addr_mem = bar5->addr_mem = &quirk->mem[0];
window->data_mem = bar5->data_mem = &quirk->mem[1];
memory_region_init_io(window->addr_mem, OBJECT(vdev),
&vfio_generic_window_address_quirk, window,
"vfio-nvidia-bar5-window-address-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->address_offset,
window->addr_mem, 1);
memory_region_set_enabled(window->addr_mem, false);
memory_region_init_io(window->data_mem, OBJECT(vdev),
&vfio_generic_window_data_quirk, window,
"vfio-nvidia-bar5-window-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
window->data_offset,
window->data_mem, 1);
memory_region_set_enabled(window->data_mem, false);
memory_region_init_io(&quirk->mem[2], OBJECT(vdev),
&vfio_nvidia_bar5_quirk_master, bar5,
"vfio-nvidia-bar5-master-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0, &quirk->mem[2], 1);
memory_region_init_io(&quirk->mem[3], OBJECT(vdev),
&vfio_nvidia_bar5_quirk_enable, bar5,
"vfio-nvidia-bar5-enable-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
4, &quirk->mem[3], 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_nvidia_bar5_probe(vdev->vbasedev.name);
}
typedef struct LastDataSet {
VFIOQuirk *quirk;
hwaddr addr;
uint64_t data;
unsigned size;
int hits;
int added;
} LastDataSet;
#define MAX_DYN_IOEVENTFD 10
#define HITS_FOR_IOEVENTFD 10
/*
* Finally, BAR0 itself. We want to redirect any accesses to either
* 0x1800 or 0x88000 through the PCI config space access functions.
*/
static void vfio_nvidia_quirk_mirror_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOConfigMirrorQuirk *mirror = opaque;
VFIOPCIDevice *vdev = mirror->vdev;
PCIDevice *pdev = &vdev->pdev;
LastDataSet *last = (LastDataSet *)&mirror->data;
vfio_generic_quirk_mirror_write(opaque, addr, data, size);
/*
* Nvidia seems to acknowledge MSI interrupts by writing 0xff to the
* MSI capability ID register. Both the ID and next register are
* read-only, so we allow writes covering either of those to real hw.
*/
if ((pdev->cap_present & QEMU_PCI_CAP_MSI) &&
vfio_range_contained(addr, size, pdev->msi_cap, PCI_MSI_FLAGS)) {
vfio_region_write(&vdev->bars[mirror->bar].region,
addr + mirror->offset, data, size);
trace_vfio_quirk_nvidia_bar0_msi_ack(vdev->vbasedev.name);
}
/*
* Automatically add an ioeventfd to handle any repeated write with the
* same data and size above the standard PCI config space header. This is
* primarily expected to accelerate the MSI-ACK behavior, such as noted
* above. Current hardware/drivers should trigger an ioeventfd at config
* offset 0x704 (region offset 0x88704), with data 0x0, size 4.
*
* The criteria of 10 successive hits is arbitrary but reliably adds the
* MSI-ACK region. Note that as some writes are bypassed via the ioeventfd,
* the remaining ones have a greater chance of being seen successively.
* To avoid the pathological case of burning up all of QEMU's open file
* handles, arbitrarily limit this algorithm from adding no more than 10
* ioeventfds, print an error if we would have added an 11th, and then
* stop counting.
*/
if (!vdev->no_kvm_ioeventfd &&
addr >= PCI_STD_HEADER_SIZEOF && last->added <= MAX_DYN_IOEVENTFD) {
if (addr != last->addr || data != last->data || size != last->size) {
last->addr = addr;
last->data = data;
last->size = size;
last->hits = 1;
} else if (++last->hits >= HITS_FOR_IOEVENTFD) {
if (last->added < MAX_DYN_IOEVENTFD) {
VFIOIOEventFD *ioeventfd;
ioeventfd = vfio_ioeventfd_init(vdev, mirror->mem, addr, size,
data, &vdev->bars[mirror->bar].region,
mirror->offset + addr, true);
if (ioeventfd) {
VFIOQuirk *quirk = last->quirk;
QLIST_INSERT_HEAD(&quirk->ioeventfds, ioeventfd, next);
last->added++;
}
} else {
last->added++;
warn_report("NVIDIA ioeventfd queue full for %s, unable to "
"accelerate 0x%"HWADDR_PRIx", data 0x%"PRIx64", "
"size %u", vdev->vbasedev.name, addr, data, size);
}
}
}
}
static const MemoryRegionOps vfio_nvidia_mirror_quirk = {
.read = vfio_generic_quirk_mirror_read,
.write = vfio_nvidia_quirk_mirror_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_nvidia_bar0_quirk_reset(VFIOPCIDevice *vdev, VFIOQuirk *quirk)
{
VFIOConfigMirrorQuirk *mirror = quirk->data;
LastDataSet *last = (LastDataSet *)&mirror->data;
last->addr = last->data = last->size = last->hits = last->added = 0;
vfio_drop_dynamic_eventfds(vdev, quirk);
}
static void vfio_probe_nvidia_bar0_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOConfigMirrorQuirk *mirror;
LastDataSet *last;
if (vdev->no_geforce_quirks ||
!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID) ||
!vfio_is_vga(vdev) || nr != 0) {
return;
}
quirk = vfio_quirk_alloc(1);
quirk->reset = vfio_nvidia_bar0_quirk_reset;
mirror = quirk->data = g_malloc0(sizeof(*mirror) + sizeof(LastDataSet));
mirror->mem = quirk->mem;
mirror->vdev = vdev;
mirror->offset = 0x88000;
mirror->bar = nr;
last = (LastDataSet *)&mirror->data;
last->quirk = quirk;
memory_region_init_io(mirror->mem, OBJECT(vdev),
&vfio_nvidia_mirror_quirk, mirror,
"vfio-nvidia-bar0-88000-mirror-quirk",
vdev->config_size);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
mirror->offset, mirror->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
/* The 0x1800 offset mirror only seems to get used by legacy VGA */
if (vdev->vga) {
quirk = vfio_quirk_alloc(1);
quirk->reset = vfio_nvidia_bar0_quirk_reset;
mirror = quirk->data = g_malloc0(sizeof(*mirror) + sizeof(LastDataSet));
mirror->mem = quirk->mem;
mirror->vdev = vdev;
mirror->offset = 0x1800;
mirror->bar = nr;
last = (LastDataSet *)&mirror->data;
last->quirk = quirk;
memory_region_init_io(mirror->mem, OBJECT(vdev),
&vfio_nvidia_mirror_quirk, mirror,
"vfio-nvidia-bar0-1800-mirror-quirk",
PCI_CONFIG_SPACE_SIZE);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
mirror->offset, mirror->mem, 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
}
trace_vfio_quirk_nvidia_bar0_probe(vdev->vbasedev.name);
}
/*
* TODO - Some Nvidia devices provide config access to their companion HDA
* device and even to their parent bridge via these config space mirrors.
* Add quirks for those regions.
*/
#define PCI_VENDOR_ID_REALTEK 0x10ec
/*
* RTL8168 devices have a backdoor that can access the MSI-X table. At BAR2
* offset 0x70 there is a dword data register, offset 0x74 is a dword address
* register. According to the Linux r8169 driver, the MSI-X table is addressed
* when the "type" portion of the address register is set to 0x1. This appears
* to be bits 16:30. Bit 31 is both a write indicator and some sort of
* "address latched" indicator. Bits 12:15 are a mask field, which we can
* ignore because the MSI-X table should always be accessed as a dword (full
* mask). Bits 0:11 is offset within the type.
*
* Example trace:
*
* Read from MSI-X table offset 0
* vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x1f000, 4) // store read addr
* vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x8001f000 // latch
* vfio: vfio_bar_read(0000:05:00.0:BAR2+0x70, 4) = 0xfee00398 // read data
*
* Write 0xfee00000 to MSI-X table offset 0
* vfio: vfio_bar_write(0000:05:00.0:BAR2+0x70, 0xfee00000, 4) // write data
* vfio: vfio_bar_write(0000:05:00.0:BAR2+0x74, 0x8001f000, 4) // do write
* vfio: vfio_bar_read(0000:05:00.0:BAR2+0x74, 4) = 0x1f000 // complete
*/
typedef struct VFIOrtl8168Quirk {
VFIOPCIDevice *vdev;
uint32_t addr;
uint32_t data;
bool enabled;
} VFIOrtl8168Quirk;
static uint64_t vfio_rtl8168_quirk_address_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
uint64_t data = vfio_region_read(&vdev->bars[2].region, addr + 0x74, size);
if (rtl->enabled) {
data = rtl->addr ^ 0x80000000U; /* latch/complete */
trace_vfio_quirk_rtl8168_fake_latch(vdev->vbasedev.name, data);
}
return data;
}
static void vfio_rtl8168_quirk_address_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
rtl->enabled = false;
if ((data & 0x7fff0000) == 0x10000) { /* MSI-X table */
rtl->enabled = true;
rtl->addr = (uint32_t)data;
if (data & 0x80000000U) { /* Do write */
if (vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX) {
hwaddr offset = data & 0xfff;
uint64_t val = rtl->data;
trace_vfio_quirk_rtl8168_msix_write(vdev->vbasedev.name,
(uint16_t)offset, val);
/* Write to the proper guest MSI-X table instead */
memory_region_dispatch_write(&vdev->pdev.msix_table_mmio,
offset, val, size,
MEMTXATTRS_UNSPECIFIED);
}
return; /* Do not write guest MSI-X data to hardware */
}
}
vfio_region_write(&vdev->bars[2].region, addr + 0x74, data, size);
}
static const MemoryRegionOps vfio_rtl_address_quirk = {
.read = vfio_rtl8168_quirk_address_read,
.write = vfio_rtl8168_quirk_address_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_rtl8168_quirk_data_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
uint64_t data = vfio_region_read(&vdev->bars[2].region, addr + 0x70, size);
if (rtl->enabled && (vdev->pdev.cap_present & QEMU_PCI_CAP_MSIX)) {
hwaddr offset = rtl->addr & 0xfff;
memory_region_dispatch_read(&vdev->pdev.msix_table_mmio, offset,
&data, size, MEMTXATTRS_UNSPECIFIED);
trace_vfio_quirk_rtl8168_msix_read(vdev->vbasedev.name, offset, data);
}
return data;
}
static void vfio_rtl8168_quirk_data_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOrtl8168Quirk *rtl = opaque;
VFIOPCIDevice *vdev = rtl->vdev;
rtl->data = (uint32_t)data;
vfio_region_write(&vdev->bars[2].region, addr + 0x70, data, size);
}
static const MemoryRegionOps vfio_rtl_data_quirk = {
.read = vfio_rtl8168_quirk_data_read,
.write = vfio_rtl8168_quirk_data_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
.unaligned = false,
},
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_rtl8168_bar2_quirk(VFIOPCIDevice *vdev, int nr)
{
VFIOQuirk *quirk;
VFIOrtl8168Quirk *rtl;
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_REALTEK, 0x8168) || nr != 2) {
return;
}
quirk = vfio_quirk_alloc(2);
quirk->data = rtl = g_malloc0(sizeof(*rtl));
rtl->vdev = vdev;
memory_region_init_io(&quirk->mem[0], OBJECT(vdev),
&vfio_rtl_address_quirk, rtl,
"vfio-rtl8168-window-address-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0x74, &quirk->mem[0], 1);
memory_region_init_io(&quirk->mem[1], OBJECT(vdev),
&vfio_rtl_data_quirk, rtl,
"vfio-rtl8168-window-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0x70, &quirk->mem[1], 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
trace_vfio_quirk_rtl8168_probe(vdev->vbasedev.name);
}
/*
* Intel IGD support
*
* Obviously IGD is not a discrete device, this is evidenced not only by it
* being integrated into the CPU, but by the various chipset and BIOS
* dependencies that it brings along with it. Intel is trying to move away
* from this and Broadwell and newer devices can run in what Intel calls
* "Universal Pass-Through" mode, or UPT. Theoretically in UPT mode, nothing
* more is required beyond assigning the IGD device to a VM. There are
* however support limitations to this mode. It only supports IGD as a
* secondary graphics device in the VM and it doesn't officially support any
* physical outputs.
*
* The code here attempts to enable what we'll call legacy mode assignment,
* IGD retains most of the capabilities we expect for it to have on bare
* metal. To enable this mode, the IGD device must be assigned to the VM
* at PCI address 00:02.0, it must have a ROM, it very likely needs VGA
* support, we must have VM BIOS support for reserving and populating some
* of the required tables, and we need to tweak the chipset with revisions
* and IDs and an LPC/ISA bridge device. The intention is to make all of
* this happen automatically by installing the device at the correct VM PCI
* bus address. If any of the conditions are not met, we cross our fingers
* and hope the user knows better.
*
* NB - It is possible to enable physical outputs in UPT mode by supplying
* an OpRegion table. We don't do this by default because the guest driver
* behaves differently if an OpRegion is provided and no monitor is attached
* vs no OpRegion and a monitor being attached or not. Effectively, if a
* headless setup is desired, the OpRegion gets in the way of that.
*/
/*
* This presumes the device is already known to be an Intel VGA device, so we
* take liberties in which device ID bits match which generation. This should
* not be taken as an indication that all the devices are supported, or even
* supportable, some of them don't even support VT-d.
* See linux:include/drm/i915_pciids.h for IDs.
*/
static int igd_gen(VFIOPCIDevice *vdev)
{
if ((vdev->device_id & 0xfff) == 0xa84) {
return 8; /* Broxton */
}
switch (vdev->device_id & 0xff00) {
/* Old, untested, unavailable, unknown */
case 0x0000:
case 0x2500:
case 0x2700:
case 0x2900:
case 0x2a00:
case 0x2e00:
case 0x3500:
case 0xa000:
return -1;
/* SandyBridge, IvyBridge, ValleyView, Haswell */
case 0x0100:
case 0x0400:
case 0x0a00:
case 0x0c00:
case 0x0d00:
case 0x0f00:
return 6;
/* BroadWell, CherryView, SkyLake, KabyLake */
case 0x1600:
case 0x1900:
case 0x2200:
case 0x5900:
return 8;
}
return 8; /* Assume newer is compatible */
}
typedef struct VFIOIGDQuirk {
struct VFIOPCIDevice *vdev;
uint32_t index;
uint32_t bdsm;
} VFIOIGDQuirk;
#define IGD_GMCH 0x50 /* Graphics Control Register */
#define IGD_BDSM 0x5c /* Base Data of Stolen Memory */
#define IGD_ASLS 0xfc /* ASL Storage Register */
/*
* The OpRegion includes the Video BIOS Table, which seems important for
* telling the driver what sort of outputs it has. Without this, the device
* may work in the guest, but we may not get output. This also requires BIOS
* support to reserve and populate a section of guest memory sufficient for
* the table and to write the base address of that memory to the ASLS register
* of the IGD device.
*/
int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
struct vfio_region_info *info, Error **errp)
{
int ret;
vdev->igd_opregion = g_malloc0(info->size);
ret = pread(vdev->vbasedev.fd, vdev->igd_opregion,
info->size, info->offset);
if (ret != info->size) {
error_setg(errp, "failed to read IGD OpRegion");
g_free(vdev->igd_opregion);
vdev->igd_opregion = NULL;
return -EINVAL;
}
/*
* Provide fw_cfg with a copy of the OpRegion which the VM firmware is to
* allocate 32bit reserved memory for, copy these contents into, and write
* the reserved memory base address to the device ASLS register at 0xFC.
* Alignment of this reserved region seems flexible, but using a 4k page
* alignment seems to work well. This interface assumes a single IGD
* device, which may be at VM address 00:02.0 in legacy mode or another
* address in UPT mode.
*
* NB, there may be future use cases discovered where the VM should have
* direct interaction with the host OpRegion, in which case the write to
* the ASLS register would trigger MemoryRegion setup to enable that.
*/
fw_cfg_add_file(fw_cfg_find(), "etc/igd-opregion",
vdev->igd_opregion, info->size);
trace_vfio_pci_igd_opregion_enabled(vdev->vbasedev.name);
pci_set_long(vdev->pdev.config + IGD_ASLS, 0);
pci_set_long(vdev->pdev.wmask + IGD_ASLS, ~0);
pci_set_long(vdev->emulated_config_bits + IGD_ASLS, ~0);
return 0;
}
/*
* The rather short list of registers that we copy from the host devices.
* The LPC/ISA bridge values are definitely needed to support the vBIOS, the
* host bridge values may or may not be needed depending on the guest OS.
* Since we're only munging revision and subsystem values on the host bridge,
* we don't require our own device. The LPC/ISA bridge needs to be our very
* own though.
*/
typedef struct {
uint8_t offset;
uint8_t len;
} IGDHostInfo;
static const IGDHostInfo igd_host_bridge_infos[] = {
{PCI_REVISION_ID, 2},
{PCI_SUBSYSTEM_VENDOR_ID, 2},
{PCI_SUBSYSTEM_ID, 2},
};
static const IGDHostInfo igd_lpc_bridge_infos[] = {
{PCI_VENDOR_ID, 2},
{PCI_DEVICE_ID, 2},
{PCI_REVISION_ID, 2},
{PCI_SUBSYSTEM_VENDOR_ID, 2},
{PCI_SUBSYSTEM_ID, 2},
};
static int vfio_pci_igd_copy(VFIOPCIDevice *vdev, PCIDevice *pdev,
struct vfio_region_info *info,
const IGDHostInfo *list, int len)
{
int i, ret;
for (i = 0; i < len; i++) {
ret = pread(vdev->vbasedev.fd, pdev->config + list[i].offset,
list[i].len, info->offset + list[i].offset);
if (ret != list[i].len) {
error_report("IGD copy failed: %m");
return -errno;
}
}
return 0;
}
/*
* Stuff a few values into the host bridge.
*/
static int vfio_pci_igd_host_init(VFIOPCIDevice *vdev,
struct vfio_region_info *info)
{
PCIBus *bus;
PCIDevice *host_bridge;
int ret;
bus = pci_device_root_bus(&vdev->pdev);
host_bridge = pci_find_device(bus, 0, PCI_DEVFN(0, 0));
if (!host_bridge) {
error_report("Can't find host bridge");
return -ENODEV;
}
ret = vfio_pci_igd_copy(vdev, host_bridge, info, igd_host_bridge_infos,
ARRAY_SIZE(igd_host_bridge_infos));
if (!ret) {
trace_vfio_pci_igd_host_bridge_enabled(vdev->vbasedev.name);
}
return ret;
}
/*
* IGD LPC/ISA bridge support code. The vBIOS needs this, but we can't write
* arbitrary values into just any bridge, so we must create our own. We try
* to handle if the user has created it for us, which they might want to do
* to enable multifunction so we don't occupy the whole PCI slot.
*/
static void vfio_pci_igd_lpc_bridge_realize(PCIDevice *pdev, Error **errp)
{
if (pdev->devfn != PCI_DEVFN(0x1f, 0)) {
error_setg(errp, "VFIO dummy ISA/LPC bridge must have address 1f.0");
}
}
static void vfio_pci_igd_lpc_bridge_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
dc->desc = "VFIO dummy ISA/LPC bridge for IGD assignment";
dc->hotpluggable = false;
k->realize = vfio_pci_igd_lpc_bridge_realize;
k->class_id = PCI_CLASS_BRIDGE_ISA;
}
static TypeInfo vfio_pci_igd_lpc_bridge_info = {
.name = "vfio-pci-igd-lpc-bridge",
.parent = TYPE_PCI_DEVICE,
.class_init = vfio_pci_igd_lpc_bridge_class_init,
.interfaces = (InterfaceInfo[]) {
{ INTERFACE_CONVENTIONAL_PCI_DEVICE },
{ },
},
};
static void vfio_pci_igd_register_types(void)
{
type_register_static(&vfio_pci_igd_lpc_bridge_info);
}
type_init(vfio_pci_igd_register_types)
static int vfio_pci_igd_lpc_init(VFIOPCIDevice *vdev,
struct vfio_region_info *info)
{
PCIDevice *lpc_bridge;
int ret;
lpc_bridge = pci_find_device(pci_device_root_bus(&vdev->pdev),
0, PCI_DEVFN(0x1f, 0));
if (!lpc_bridge) {
lpc_bridge = pci_create_simple(pci_device_root_bus(&vdev->pdev),
PCI_DEVFN(0x1f, 0), "vfio-pci-igd-lpc-bridge");
}
ret = vfio_pci_igd_copy(vdev, lpc_bridge, info, igd_lpc_bridge_infos,
ARRAY_SIZE(igd_lpc_bridge_infos));
if (!ret) {
trace_vfio_pci_igd_lpc_bridge_enabled(vdev->vbasedev.name);
}
return ret;
}
/*
* IGD Gen8 and newer support up to 8MB for the GTT and use a 64bit PTE
* entry, older IGDs use 2MB and 32bit. Each PTE maps a 4k page. Therefore
* we either have 2M/4k * 4 = 2k or 8M/4k * 8 = 16k as the maximum iobar index
* for programming the GTT.
*
* See linux:include/drm/i915_drm.h for shift and mask values.
*/
static int vfio_igd_gtt_max(VFIOPCIDevice *vdev)
{
uint32_t gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, sizeof(gmch));
int ggms, gen = igd_gen(vdev);
gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, sizeof(gmch));
ggms = (gmch >> (gen < 8 ? 8 : 6)) & 0x3;
if (gen > 6) {
ggms = 1 << ggms;
}
ggms *= MiB;
return (ggms / (4 * KiB)) * (gen < 8 ? 4 : 8);
}
/*
* The IGD ROM will make use of stolen memory (GGMS) for support of VESA modes.
* Somehow the host stolen memory range is used for this, but how the ROM gets
* it is a mystery, perhaps it's hardcoded into the ROM. Thankfully though, it
* reprograms the GTT through the IOBAR where we can trap it and transpose the
* programming to the VM allocated buffer. That buffer gets reserved by the VM
* firmware via the fw_cfg entry added below. Here we're just monitoring the
* IOBAR address and data registers to detect a write sequence targeting the
* GTTADR. This code is developed by observed behavior and doesn't have a
* direct spec reference, unfortunately.
*/
static uint64_t vfio_igd_quirk_data_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOIGDQuirk *igd = opaque;
VFIOPCIDevice *vdev = igd->vdev;
igd->index = ~0;
return vfio_region_read(&vdev->bars[4].region, addr + 4, size);
}
static void vfio_igd_quirk_data_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOIGDQuirk *igd = opaque;
VFIOPCIDevice *vdev = igd->vdev;
uint64_t val = data;
int gen = igd_gen(vdev);
/*
* Programming the GGMS starts at index 0x1 and uses every 4th index (ie.
* 0x1, 0x5, 0x9, 0xd,...). For pre-Gen8 each 4-byte write is a whole PTE
* entry, with 0th bit enable set. For Gen8 and up, PTEs are 64bit, so
* entries 0x5 & 0xd are the high dword, in our case zero. Each PTE points
* to a 4k page, which we translate to a page from the VM allocated region,
* pointed to by the BDSM register. If this is not set, we fail.
*
* We trap writes to the full configured GTT size, but we typically only
* see the vBIOS writing up to (nearly) the 1MB barrier. In fact it often
* seems to miss the last entry for an even 1MB GTT. Doing a gratuitous
* write of that last entry does work, but is hopefully unnecessary since
* we clear the previous GTT on initialization.
*/
if ((igd->index % 4 == 1) && igd->index < vfio_igd_gtt_max(vdev)) {
if (gen < 8 || (igd->index % 8 == 1)) {
uint32_t base;
base = pci_get_long(vdev->pdev.config + IGD_BDSM);
if (!base) {
hw_error("vfio-igd: Guest attempted to program IGD GTT before "
"BIOS reserved stolen memory. Unsupported BIOS?");
}
val = data - igd->bdsm + base;
} else {
val = 0; /* upper 32bits of pte, we only enable below 4G PTEs */
}
trace_vfio_pci_igd_bar4_write(vdev->vbasedev.name,
igd->index, data, val);
}
vfio_region_write(&vdev->bars[4].region, addr + 4, val, size);
igd->index = ~0;
}
static const MemoryRegionOps vfio_igd_data_quirk = {
.read = vfio_igd_quirk_data_read,
.write = vfio_igd_quirk_data_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static uint64_t vfio_igd_quirk_index_read(void *opaque,
hwaddr addr, unsigned size)
{
VFIOIGDQuirk *igd = opaque;
VFIOPCIDevice *vdev = igd->vdev;
igd->index = ~0;
return vfio_region_read(&vdev->bars[4].region, addr, size);
}
static void vfio_igd_quirk_index_write(void *opaque, hwaddr addr,
uint64_t data, unsigned size)
{
VFIOIGDQuirk *igd = opaque;
VFIOPCIDevice *vdev = igd->vdev;
igd->index = data;
vfio_region_write(&vdev->bars[4].region, addr, data, size);
}
static const MemoryRegionOps vfio_igd_index_quirk = {
.read = vfio_igd_quirk_index_read,
.write = vfio_igd_quirk_index_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr)
{
struct vfio_region_info *rom = NULL, *opregion = NULL,
*host = NULL, *lpc = NULL;
VFIOQuirk *quirk;
VFIOIGDQuirk *igd;
PCIDevice *lpc_bridge;
int i, ret, ggms_mb, gms_mb = 0, gen;
uint64_t *bdsm_size;
uint32_t gmch;
uint16_t cmd_orig, cmd;
Error *err = NULL;
/*
* This must be an Intel VGA device at address 00:02.0 for us to even
* consider enabling legacy mode. The vBIOS has dependencies on the
* PCI bus address.
*/
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_INTEL, PCI_ANY_ID) ||
!vfio_is_vga(vdev) || nr != 4 ||
&vdev->pdev != pci_find_device(pci_device_root_bus(&vdev->pdev),
0, PCI_DEVFN(0x2, 0))) {
return;
}
/*
* We need to create an LPC/ISA bridge at PCI bus address 00:1f.0 that we
* can stuff host values into, so if there's already one there and it's not
* one we can hack on, legacy mode is no-go. Sorry Q35.
*/
lpc_bridge = pci_find_device(pci_device_root_bus(&vdev->pdev),
0, PCI_DEVFN(0x1f, 0));
if (lpc_bridge && !object_dynamic_cast(OBJECT(lpc_bridge),
"vfio-pci-igd-lpc-bridge")) {
error_report("IGD device %s cannot support legacy mode due to existing "
"devices at address 1f.0", vdev->vbasedev.name);
return;
}
/*
* IGD is not a standard, they like to change their specs often. We
* only attempt to support back to SandBridge and we hope that newer
* devices maintain compatibility with generation 8.
*/
gen = igd_gen(vdev);
if (gen != 6 && gen != 8) {
error_report("IGD device %s is unsupported in legacy mode, "
"try SandyBridge or newer", vdev->vbasedev.name);
return;
}
/*
* Most of what we're doing here is to enable the ROM to run, so if
* there's no ROM, there's no point in setting up this quirk.
* NB. We only seem to get BIOS ROMs, so a UEFI VM would need CSM support.
*/
ret = vfio_get_region_info(&vdev->vbasedev,
VFIO_PCI_ROM_REGION_INDEX, &rom);
if ((ret || !rom->size) && !vdev->pdev.romfile) {
error_report("IGD device %s has no ROM, legacy mode disabled",
vdev->vbasedev.name);
goto out;
}
/*
* Ignore the hotplug corner case, mark the ROM failed, we can't
* create the devices we need for legacy mode in the hotplug scenario.
*/
if (vdev->pdev.qdev.hotplugged) {
error_report("IGD device %s hotplugged, ROM disabled, "
"legacy mode disabled", vdev->vbasedev.name);
vdev->rom_read_failed = true;
goto out;
}
/*
* Check whether we have all the vfio device specific regions to
* support legacy mode (added in Linux v4.6). If not, bail.
*/
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL,
VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION, &opregion);
if (ret) {
error_report("IGD device %s does not support OpRegion access,"
"legacy mode disabled", vdev->vbasedev.name);
goto out;
}
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL,
VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG, &host);
if (ret) {
error_report("IGD device %s does not support host bridge access,"
"legacy mode disabled", vdev->vbasedev.name);
goto out;
}
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE | PCI_VENDOR_ID_INTEL,
VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG, &lpc);
if (ret) {
error_report("IGD device %s does not support LPC bridge access,"
"legacy mode disabled", vdev->vbasedev.name);
goto out;
}
gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, 4);
/*
* If IGD VGA Disable is clear (expected) and VGA is not already enabled,
* try to enable it. Probably shouldn't be using legacy mode without VGA,
* but also no point in us enabling VGA if disabled in hardware.
*/
if (!(gmch & 0x2) && !vdev->vga && vfio_populate_vga(vdev, &err)) {
error_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name);
error_report("IGD device %s failed to enable VGA access, "
"legacy mode disabled", vdev->vbasedev.name);
goto out;
}
/* Create our LPC/ISA bridge */
ret = vfio_pci_igd_lpc_init(vdev, lpc);
if (ret) {
error_report("IGD device %s failed to create LPC bridge, "
"legacy mode disabled", vdev->vbasedev.name);
goto out;
}
/* Stuff some host values into the VM PCI host bridge */
ret = vfio_pci_igd_host_init(vdev, host);
if (ret) {
error_report("IGD device %s failed to modify host bridge, "
"legacy mode disabled", vdev->vbasedev.name);
goto out;
}
/* Setup OpRegion access */
ret = vfio_pci_igd_opregion_init(vdev, opregion, &err);
if (ret) {
error_append_hint(&err, "IGD legacy mode disabled\n");
error_reportf_err(err, VFIO_MSG_PREFIX, vdev->vbasedev.name);
goto out;
}
/* Setup our quirk to munge GTT addresses to the VM allocated buffer */
quirk = vfio_quirk_alloc(2);
igd = quirk->data = g_malloc0(sizeof(*igd));
igd->vdev = vdev;
igd->index = ~0;
igd->bdsm = vfio_pci_read_config(&vdev->pdev, IGD_BDSM, 4);
igd->bdsm &= ~((1 * MiB) - 1); /* 1MB aligned */
memory_region_init_io(&quirk->mem[0], OBJECT(vdev), &vfio_igd_index_quirk,
igd, "vfio-igd-index-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
0, &quirk->mem[0], 1);
memory_region_init_io(&quirk->mem[1], OBJECT(vdev), &vfio_igd_data_quirk,
igd, "vfio-igd-data-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[nr].region.mem,
4, &quirk->mem[1], 1);
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
/* Determine the size of stolen memory needed for GTT */
ggms_mb = (gmch >> (gen < 8 ? 8 : 6)) & 0x3;
if (gen > 6) {
ggms_mb = 1 << ggms_mb;
}
/*
* Assume we have no GMS memory, but allow it to be overrided by device
* option (experimental). The spec doesn't actually allow zero GMS when
* when IVD (IGD VGA Disable) is clear, but the claim is that it's unused,
* so let's not waste VM memory for it.
*/
gmch &= ~((gen < 8 ? 0x1f : 0xff) << (gen < 8 ? 3 : 8));
if (vdev->igd_gms) {
if (vdev->igd_gms <= 0x10) {
gms_mb = vdev->igd_gms * 32;
gmch |= vdev->igd_gms << (gen < 8 ? 3 : 8);
} else {
error_report("Unsupported IGD GMS value 0x%x", vdev->igd_gms);
vdev->igd_gms = 0;
}
}
/*
* Request reserved memory for stolen memory via fw_cfg. VM firmware
* must allocate a 1MB aligned reserved memory region below 4GB with
* the requested size (in bytes) for use by the Intel PCI class VGA
* device at VM address 00:02.0. The base address of this reserved
* memory region must be written to the device BDSM regsiter at PCI
* config offset 0x5C.
*/
bdsm_size = g_malloc(sizeof(*bdsm_size));
*bdsm_size = cpu_to_le64((ggms_mb + gms_mb) * MiB);
fw_cfg_add_file(fw_cfg_find(), "etc/igd-bdsm-size",
bdsm_size, sizeof(*bdsm_size));
/* GMCH is read-only, emulated */
pci_set_long(vdev->pdev.config + IGD_GMCH, gmch);
pci_set_long(vdev->pdev.wmask + IGD_GMCH, 0);
pci_set_long(vdev->emulated_config_bits + IGD_GMCH, ~0);
/* BDSM is read-write, emulated. The BIOS needs to be able to write it */
pci_set_long(vdev->pdev.config + IGD_BDSM, 0);
pci_set_long(vdev->pdev.wmask + IGD_BDSM, ~0);
pci_set_long(vdev->emulated_config_bits + IGD_BDSM, ~0);
/*
* This IOBAR gives us access to GTTADR, which allows us to write to
* the GTT itself. So let's go ahead and write zero to all the GTT
* entries to avoid spurious DMA faults. Be sure I/O access is enabled
* before talking to the device.
*/
if (pread(vdev->vbasedev.fd, &cmd_orig, sizeof(cmd_orig),
vdev->config_offset + PCI_COMMAND) != sizeof(cmd_orig)) {
error_report("IGD device %s - failed to read PCI command register",
vdev->vbasedev.name);
}
cmd = cmd_orig | PCI_COMMAND_IO;
if (pwrite(vdev->vbasedev.fd, &cmd, sizeof(cmd),
vdev->config_offset + PCI_COMMAND) != sizeof(cmd)) {
error_report("IGD device %s - failed to write PCI command register",
vdev->vbasedev.name);
}
for (i = 1; i < vfio_igd_gtt_max(vdev); i += 4) {
vfio_region_write(&vdev->bars[4].region, 0, i, 4);
vfio_region_write(&vdev->bars[4].region, 4, 0, 4);
}
if (pwrite(vdev->vbasedev.fd, &cmd_orig, sizeof(cmd_orig),
vdev->config_offset + PCI_COMMAND) != sizeof(cmd_orig)) {
error_report("IGD device %s - failed to restore PCI command register",
vdev->vbasedev.name);
}
trace_vfio_pci_igd_bdsm_enabled(vdev->vbasedev.name, ggms_mb + gms_mb);
out:
g_free(rom);
g_free(opregion);
g_free(host);
g_free(lpc);
}
/*
* Common quirk probe entry points.
*/
void vfio_vga_quirk_setup(VFIOPCIDevice *vdev)
{
vfio_vga_probe_ati_3c3_quirk(vdev);
vfio_vga_probe_nvidia_3d0_quirk(vdev);
}
void vfio_vga_quirk_exit(VFIOPCIDevice *vdev)
{
VFIOQuirk *quirk;
int i, j;
for (i = 0; i < ARRAY_SIZE(vdev->vga->region); i++) {
QLIST_FOREACH(quirk, &vdev->vga->region[i].quirks, next) {
for (j = 0; j < quirk->nr_mem; j++) {
memory_region_del_subregion(&vdev->vga->region[i].mem,
&quirk->mem[j]);
}
}
}
}
void vfio_vga_quirk_finalize(VFIOPCIDevice *vdev)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(vdev->vga->region); i++) {
while (!QLIST_EMPTY(&vdev->vga->region[i].quirks)) {
VFIOQuirk *quirk = QLIST_FIRST(&vdev->vga->region[i].quirks);
QLIST_REMOVE(quirk, next);
for (j = 0; j < quirk->nr_mem; j++) {
object_unparent(OBJECT(&quirk->mem[j]));
}
g_free(quirk->mem);
g_free(quirk->data);
g_free(quirk);
}
}
}
void vfio_bar_quirk_setup(VFIOPCIDevice *vdev, int nr)
{
vfio_probe_ati_bar4_quirk(vdev, nr);
vfio_probe_ati_bar2_quirk(vdev, nr);
vfio_probe_nvidia_bar5_quirk(vdev, nr);
vfio_probe_nvidia_bar0_quirk(vdev, nr);
vfio_probe_rtl8168_bar2_quirk(vdev, nr);
vfio_probe_igd_bar4_quirk(vdev, nr);
}
void vfio_bar_quirk_exit(VFIOPCIDevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
VFIOQuirk *quirk;
int i;
QLIST_FOREACH(quirk, &bar->quirks, next) {
while (!QLIST_EMPTY(&quirk->ioeventfds)) {
vfio_ioeventfd_exit(vdev, QLIST_FIRST(&quirk->ioeventfds));
}
for (i = 0; i < quirk->nr_mem; i++) {
memory_region_del_subregion(bar->region.mem, &quirk->mem[i]);
}
}
}
void vfio_bar_quirk_finalize(VFIOPCIDevice *vdev, int nr)
{
VFIOBAR *bar = &vdev->bars[nr];
int i;
while (!QLIST_EMPTY(&bar->quirks)) {
VFIOQuirk *quirk = QLIST_FIRST(&bar->quirks);
QLIST_REMOVE(quirk, next);
for (i = 0; i < quirk->nr_mem; i++) {
object_unparent(OBJECT(&quirk->mem[i]));
}
g_free(quirk->mem);
g_free(quirk->data);
g_free(quirk);
}
}
/*
* Reset quirks
*/
void vfio_quirk_reset(VFIOPCIDevice *vdev)
{
int i;
for (i = 0; i < PCI_ROM_SLOT; i++) {
VFIOQuirk *quirk;
VFIOBAR *bar = &vdev->bars[i];
QLIST_FOREACH(quirk, &bar->quirks, next) {
if (quirk->reset) {
quirk->reset(vdev, quirk);
}
}
}
}
/*
* AMD Radeon PCI config reset, based on Linux:
* drivers/gpu/drm/radeon/ci_smc.c:ci_is_smc_running()
* drivers/gpu/drm/radeon/radeon_device.c:radeon_pci_config_reset
* drivers/gpu/drm/radeon/ci_smc.c:ci_reset_smc()
* drivers/gpu/drm/radeon/ci_smc.c:ci_stop_smc_clock()
* IDs: include/drm/drm_pciids.h
* Registers: http://cgit.freedesktop.org/~agd5f/linux/commit/?id=4e2aa447f6f0
*
* Bonaire and Hawaii GPUs do not respond to a bus reset. This is a bug in the
* hardware that should be fixed on future ASICs. The symptom of this is that
* once the accerlated driver loads, Windows guests will bsod on subsequent
* attmpts to load the driver, such as after VM reset or shutdown/restart. To
* work around this, we do an AMD specific PCI config reset, followed by an SMC
* reset. The PCI config reset only works if SMC firmware is running, so we
* have a dependency on the state of the device as to whether this reset will
* be effective. There are still cases where we won't be able to kick the
* device into working, but this greatly improves the usability overall. The
* config reset magic is relatively common on AMD GPUs, but the setup and SMC
* poking is largely ASIC specific.
*/
static bool vfio_radeon_smc_is_running(VFIOPCIDevice *vdev)
{
uint32_t clk, pc_c;
/*
* Registers 200h and 204h are index and data registers for accessing
* indirect configuration registers within the device.
*/
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4);
clk = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000370, 4);
pc_c = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
return (!(clk & 1) && (0x20100 <= pc_c));
}
/*
* The scope of a config reset is controlled by a mode bit in the misc register
* and a fuse, exposed as a bit in another register. The fuse is the default
* (0 = GFX, 1 = whole GPU), the misc bit is a toggle, with the forumula
* scope = !(misc ^ fuse), where the resulting scope is defined the same as
* the fuse. A truth table therefore tells us that if misc == fuse, we need
* to flip the value of the bit in the misc register.
*/
static void vfio_radeon_set_gfx_only_reset(VFIOPCIDevice *vdev)
{
uint32_t misc, fuse;
bool a, b;
vfio_region_write(&vdev->bars[5].region, 0x200, 0xc00c0000, 4);
fuse = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
b = fuse & 64;
vfio_region_write(&vdev->bars[5].region, 0x200, 0xc0000010, 4);
misc = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
a = misc & 2;
if (a == b) {
vfio_region_write(&vdev->bars[5].region, 0x204, misc ^ 2, 4);
vfio_region_read(&vdev->bars[5].region, 0x204, 4); /* flush */
}
}
static int vfio_radeon_reset(VFIOPCIDevice *vdev)
{
PCIDevice *pdev = &vdev->pdev;
int i, ret = 0;
uint32_t data;
/* Defer to a kernel implemented reset */
if (vdev->vbasedev.reset_works) {
trace_vfio_quirk_ati_bonaire_reset_skipped(vdev->vbasedev.name);
return -ENODEV;
}
/* Enable only memory BAR access */
vfio_pci_write_config(pdev, PCI_COMMAND, PCI_COMMAND_MEMORY, 2);
/* Reset only works if SMC firmware is loaded and running */
if (!vfio_radeon_smc_is_running(vdev)) {
ret = -EINVAL;
trace_vfio_quirk_ati_bonaire_reset_no_smc(vdev->vbasedev.name);
goto out;
}
/* Make sure only the GFX function is reset */
vfio_radeon_set_gfx_only_reset(vdev);
/* AMD PCI config reset */
vfio_pci_write_config(pdev, 0x7c, 0x39d5e86b, 4);
usleep(100);
/* Read back the memory size to make sure we're out of reset */
for (i = 0; i < 100000; i++) {
if (vfio_region_read(&vdev->bars[5].region, 0x5428, 4) != 0xffffffff) {
goto reset_smc;
}
usleep(1);
}
trace_vfio_quirk_ati_bonaire_reset_timeout(vdev->vbasedev.name);
reset_smc:
/* Reset SMC */
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000000, 4);
data = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
data |= 1;
vfio_region_write(&vdev->bars[5].region, 0x204, data, 4);
/* Disable SMC clock */
vfio_region_write(&vdev->bars[5].region, 0x200, 0x80000004, 4);
data = vfio_region_read(&vdev->bars[5].region, 0x204, 4);
data |= 1;
vfio_region_write(&vdev->bars[5].region, 0x204, data, 4);
trace_vfio_quirk_ati_bonaire_reset_done(vdev->vbasedev.name);
out:
/* Restore PCI command register */
vfio_pci_write_config(pdev, PCI_COMMAND, 0, 2);
return ret;
}
void vfio_setup_resetfn_quirk(VFIOPCIDevice *vdev)
{
switch (vdev->vendor_id) {
case 0x1002:
switch (vdev->device_id) {
/* Bonaire */
case 0x6649: /* Bonaire [FirePro W5100] */
case 0x6650:
case 0x6651:
case 0x6658: /* Bonaire XTX [Radeon R7 260X] */
case 0x665c: /* Bonaire XT [Radeon HD 7790/8770 / R9 260 OEM] */
case 0x665d: /* Bonaire [Radeon R7 200 Series] */
/* Hawaii */
case 0x67A0: /* Hawaii XT GL [FirePro W9100] */
case 0x67A1: /* Hawaii PRO GL [FirePro W8100] */
case 0x67A2:
case 0x67A8:
case 0x67A9:
case 0x67AA:
case 0x67B0: /* Hawaii XT [Radeon R9 290X] */
case 0x67B1: /* Hawaii PRO [Radeon R9 290] */
case 0x67B8:
case 0x67B9:
case 0x67BA:
case 0x67BE:
vdev->resetfn = vfio_radeon_reset;
trace_vfio_quirk_ati_bonaire_reset(vdev->vbasedev.name);
break;
}
break;
}
}
/*
* The NVIDIA GPUDirect P2P Vendor capability allows the user to specify
* devices as a member of a clique. Devices within the same clique ID
* are capable of direct P2P. It's the user's responsibility that this
* is correct. The spec says that this may reside at any unused config
* offset, but reserves and recommends hypervisors place this at C8h.
* The spec also states that the hypervisor should place this capability
* at the end of the capability list, thus next is defined as 0h.
*
* +----------------+----------------+----------------+----------------+
* | sig 7:0 ('P') | vndr len (8h) | next (0h) | cap id (9h) |
* +----------------+----------------+----------------+----------------+
* | rsvd 15:7(0h),id 6:3,ver 2:0(0h)| sig 23:8 ('P2') |
* +---------------------------------+---------------------------------+
*
* https://lists.gnu.org/archive/html/qemu-devel/2017-08/pdfUda5iEpgOS.pdf
*/
static void get_nv_gpudirect_clique_id(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
uint8_t *ptr = qdev_get_prop_ptr(dev, prop);
visit_type_uint8(v, name, ptr, errp);
}
static void set_nv_gpudirect_clique_id(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
DeviceState *dev = DEVICE(obj);
Property *prop = opaque;
uint8_t value, *ptr = qdev_get_prop_ptr(dev, prop);
Error *local_err = NULL;
if (dev->realized) {
qdev_prop_set_after_realize(dev, name, errp);
return;
}
visit_type_uint8(v, name, &value, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (value & ~0xF) {
error_setg(errp, "Property %s: valid range 0-15", name);
return;
}
*ptr = value;
}
const PropertyInfo qdev_prop_nv_gpudirect_clique = {
.name = "uint4",
.description = "NVIDIA GPUDirect Clique ID (0 - 15)",
.get = get_nv_gpudirect_clique_id,
.set = set_nv_gpudirect_clique_id,
};
static int vfio_add_nv_gpudirect_cap(VFIOPCIDevice *vdev, Error **errp)
{
PCIDevice *pdev = &vdev->pdev;
int ret, pos = 0xC8;
if (vdev->nv_gpudirect_clique == 0xFF) {
return 0;
}
if (!vfio_pci_is(vdev, PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID)) {
error_setg(errp, "NVIDIA GPUDirect Clique ID: invalid device vendor");
return -EINVAL;
}
if (pci_get_byte(pdev->config + PCI_CLASS_DEVICE + 1) !=
PCI_BASE_CLASS_DISPLAY) {
error_setg(errp, "NVIDIA GPUDirect Clique ID: unsupported PCI class");
return -EINVAL;
}
ret = pci_add_capability(pdev, PCI_CAP_ID_VNDR, pos, 8, errp);
if (ret < 0) {
error_prepend(errp, "Failed to add NVIDIA GPUDirect cap: ");
return ret;
}
memset(vdev->emulated_config_bits + pos, 0xFF, 8);
pos += PCI_CAP_FLAGS;
pci_set_byte(pdev->config + pos++, 8);
pci_set_byte(pdev->config + pos++, 'P');
pci_set_byte(pdev->config + pos++, '2');
pci_set_byte(pdev->config + pos++, 'P');
pci_set_byte(pdev->config + pos++, vdev->nv_gpudirect_clique << 3);
pci_set_byte(pdev->config + pos, 0);
return 0;
}
int vfio_add_virt_caps(VFIOPCIDevice *vdev, Error **errp)
{
int ret;
ret = vfio_add_nv_gpudirect_cap(vdev, errp);
if (ret) {
return ret;
}
return 0;
}
static void vfio_pci_nvlink2_get_tgt(Object *obj, Visitor *v,
const char *name,
void *opaque, Error **errp)
{
uint64_t tgt = (uintptr_t) opaque;
visit_type_uint64(v, name, &tgt, errp);
}
static void vfio_pci_nvlink2_get_link_speed(Object *obj, Visitor *v,
const char *name,
void *opaque, Error **errp)
{
uint32_t link_speed = (uint32_t)(uintptr_t) opaque;
visit_type_uint32(v, name, &link_speed, errp);
}
int vfio_pci_nvidia_v100_ram_init(VFIOPCIDevice *vdev, Error **errp)
{
int ret;
void *p;
struct vfio_region_info *nv2reg = NULL;
struct vfio_info_cap_header *hdr;
struct vfio_region_info_cap_nvlink2_ssatgt *cap;
VFIOQuirk *quirk;
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE |
PCI_VENDOR_ID_NVIDIA,
VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM,
&nv2reg);
if (ret) {
return ret;
}
hdr = vfio_get_region_info_cap(nv2reg, VFIO_REGION_INFO_CAP_NVLINK2_SSATGT);
if (!hdr) {
ret = -ENODEV;
goto free_exit;
}
cap = (void *) hdr;
p = mmap(NULL, nv2reg->size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_SHARED, vdev->vbasedev.fd, nv2reg->offset);
if (p == MAP_FAILED) {
ret = -errno;
goto free_exit;
}
quirk = vfio_quirk_alloc(1);
memory_region_init_ram_ptr(&quirk->mem[0], OBJECT(vdev), "nvlink2-mr",
nv2reg->size, p);
QLIST_INSERT_HEAD(&vdev->bars[0].quirks, quirk, next);
object_property_add(OBJECT(vdev), "nvlink2-tgt", "uint64",
vfio_pci_nvlink2_get_tgt, NULL, NULL,
(void *) (uintptr_t) cap->tgt, NULL);
trace_vfio_pci_nvidia_gpu_setup_quirk(vdev->vbasedev.name, cap->tgt,
nv2reg->size);
free_exit:
g_free(nv2reg);
return ret;
}
int vfio_pci_nvlink2_init(VFIOPCIDevice *vdev, Error **errp)
{
int ret;
void *p;
struct vfio_region_info *atsdreg = NULL;
struct vfio_info_cap_header *hdr;
struct vfio_region_info_cap_nvlink2_ssatgt *captgt;
struct vfio_region_info_cap_nvlink2_lnkspd *capspeed;
VFIOQuirk *quirk;
ret = vfio_get_dev_region_info(&vdev->vbasedev,
VFIO_REGION_TYPE_PCI_VENDOR_TYPE |
PCI_VENDOR_ID_IBM,
VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD,
&atsdreg);
if (ret) {
return ret;
}
hdr = vfio_get_region_info_cap(atsdreg,
VFIO_REGION_INFO_CAP_NVLINK2_SSATGT);
if (!hdr) {
ret = -ENODEV;
goto free_exit;
}
captgt = (void *) hdr;
hdr = vfio_get_region_info_cap(atsdreg,
VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD);
if (!hdr) {
ret = -ENODEV;
goto free_exit;
}
capspeed = (void *) hdr;
/* Some NVLink bridges may not have assigned ATSD */
if (atsdreg->size) {
p = mmap(NULL, atsdreg->size, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_SHARED, vdev->vbasedev.fd, atsdreg->offset);
if (p == MAP_FAILED) {
ret = -errno;
goto free_exit;
}
quirk = vfio_quirk_alloc(1);
memory_region_init_ram_device_ptr(&quirk->mem[0], OBJECT(vdev),
"nvlink2-atsd-mr", atsdreg->size, p);
QLIST_INSERT_HEAD(&vdev->bars[0].quirks, quirk, next);
}
object_property_add(OBJECT(vdev), "nvlink2-tgt", "uint64",
vfio_pci_nvlink2_get_tgt, NULL, NULL,
(void *) (uintptr_t) captgt->tgt, NULL);
trace_vfio_pci_nvlink2_setup_quirk_ssatgt(vdev->vbasedev.name, captgt->tgt,
atsdreg->size);
object_property_add(OBJECT(vdev), "nvlink2-link-speed", "uint32",
vfio_pci_nvlink2_get_link_speed, NULL, NULL,
(void *) (uintptr_t) capspeed->link_speed, NULL);
trace_vfio_pci_nvlink2_setup_quirk_lnkspd(vdev->vbasedev.name,
capspeed->link_speed);
free_exit:
g_free(atsdreg);
return ret;
}
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