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vfio/igd: emulate BDSM in mmio bar0 for gen 6-10 devices

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A recent commit in i915 driver [1] claims the BDSM register at 0x1080c0
of mmio bar0 has been there since gen 6. Mirror this register to the 32
bit BDSM register at 0x5c in pci config space for gen6-10 devices.

[1] https://patchwork.freedesktop.org/patch/msgid/20240202224340.30647-7-ville.syrjala@linux.intel.com

Reviewed-by: Corvin Köhne <c.koehne@beckhoff.com>
Signed-off-by: Tomita Moeko <tomitamoeko@gmail.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/r/20241206122749.9893-10-tomitamoeko@gmail.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tomita Moeko 2024-12-06 20:27:47 +08:00 • committed by Cédric Le Goater
parent ea652c2bee
commit f926baa03b
1 changed files with 18 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

26
hw/vfio/igd.c
View file

@ -489,7 +489,8 @@ static const MemoryRegionOps vfio_igd_quirk_mirror_##name = { \
};
VFIO_IGD_QUIRK_MIRROR_REG(IGD_GMCH, ggc)
VFIO_IGD_QUIRK_MIRROR_REG(IGD_BDSM_GEN11, bdsm)
VFIO_IGD_QUIRK_MIRROR_REG(IGD_BDSM, bdsm)
VFIO_IGD_QUIRK_MIRROR_REG(IGD_BDSM_GEN11, bdsm64)
#define IGD_GGC_MMIO_OFFSET 0x108040
#define IGD_BDSM_MMIO_OFFSET 0x1080C0
@ -516,7 +517,7 @@ void vfio_probe_igd_bar0_quirk(VFIOPCIDevice *vdev, int nr)
* into MMIO space and read from MMIO space by the Windows driver.
*/
gen = igd_gen(vdev);
if (gen < 11) {
if (gen < 6) {
return;
}
@ -530,12 +531,21 @@ void vfio_probe_igd_bar0_quirk(VFIOPCIDevice *vdev, int nr)
IGD_GGC_MMIO_OFFSET, &quirk->mem[0],
1);
memory_region_init_io(&quirk->mem[1], OBJECT(vdev),
&vfio_igd_quirk_mirror_bdsm, vdev,
"vfio-igd-bdsm-quirk", 8);
memory_region_add_subregion_overlap(vdev->bars[0].region.mem,
IGD_BDSM_MMIO_OFFSET, &quirk->mem[1],
1);
if (gen < 11) {
memory_region_init_io(&quirk->mem[1], OBJECT(vdev),
&vfio_igd_quirk_mirror_bdsm, vdev,
"vfio-igd-bdsm-quirk", 4);
memory_region_add_subregion_overlap(vdev->bars[0].region.mem,
IGD_BDSM_MMIO_OFFSET,
&quirk->mem[1], 1);
} else {
memory_region_init_io(&quirk->mem[1], OBJECT(vdev),
&vfio_igd_quirk_mirror_bdsm64, vdev,
"vfio-igd-bdsm-quirk", 8);
memory_region_add_subregion_overlap(vdev->bars[0].region.mem,
IGD_BDSM_MMIO_OFFSET,
&quirk->mem[1], 1);
}
QLIST_INSERT_HEAD(&vdev->bars[nr].quirks, quirk, next);
}