diff options
| author | Changbin Du <changbin.du@intel.com> | 2017-08-15 13:14:04 +0800 |
|---|---|---|
| committer | Zhenyu Wang <zhenyuw@linux.intel.com> | 2017-09-08 14:21:13 +0800 |
| commit | f090a00df9ecdab5d066b099c1797e0070e27a36 (patch) | |
| tree | 72a835f98ed37eb6213133e04bbc712fb90f04e3 /drivers/gpu/drm/i915/gvt/gvt.h | |
| parent | 5d5fe176155e6cfa4a53accb90e4010baa5266d0 (diff) | |
| download | linux-f090a00df9ecdab5d066b099c1797e0070e27a36.tar.bz2 | |
drm/i915/gvt: Add emulation for BAR2 (aperture) with normal file RW approach
For vfio-pci, if the region support MMAP then it should support both
mmap and normal file access. The user-space is free to choose which is
being used. For qemu, we just need add 'x-no-mmap=on' for vfio-pci
option.
Currently GVTg only support MMAP for BAR2. So GVTg will not work when
user turn on x-no-mmap option.
This patch added file style access for BAR2, aka the GPU aperture. We
map the entire aperture partition of active vGPU to kernel space when
guest driver try to enable PCI Memory Space. Then we redirect the file
RW operation from kvmgt to this mapped area.
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1458032
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/gvt/gvt.h')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/gvt.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h index 44b719eda8c4..2fe22e1b517c 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.h +++ b/drivers/gpu/drm/i915/gvt/gvt.h @@ -80,6 +80,7 @@ struct intel_gvt_device_info { struct intel_vgpu_gm { u64 aperture_sz; u64 hidden_sz; + void *aperture_va; struct drm_mm_node low_gm_node; struct drm_mm_node high_gm_node; }; @@ -474,6 +475,13 @@ int intel_vgpu_emulate_cfg_read(struct intel_vgpu *vgpu, unsigned int offset, int intel_vgpu_emulate_cfg_write(struct intel_vgpu *vgpu, unsigned int offset, void *p_data, unsigned int bytes); +static inline u64 intel_vgpu_get_bar_gpa(struct intel_vgpu *vgpu, int bar) +{ + /* We are 64bit bar. */ + return (*(u64 *)(vgpu->cfg_space.virtual_cfg_space + bar)) & + PCI_BASE_ADDRESS_MEM_MASK; +} + void intel_gvt_clean_opregion(struct intel_gvt *gvt); int intel_gvt_init_opregion(struct intel_gvt *gvt); |