drm/i915/gvt: vGPU interrupt virtualization.
This patch introduces vGPU interrupt emulation framework.
The vGPU intrerrupt emulation framework is an event-based interrupt
emulation framework. It's responsible for emulating GEN hardware interrupts
during emulating other HW behaviour.
It consists several components:
- Descriptions of interrupt register bit
- Upper level <-> lower level interrupt mapping
- GEN HW IER/IMR/IIR register emulation routines
- Event-based interrupt propagation interface
When a GVT-g component wants to inject an interrupt to a VM during a
emulation, first it should specify the event needs to be emulated and the
framework will deal with the rest of emulation:
- Generating related virtual IIR bit according to virtual IER and IMRs,
- Generate related virtual upper level virtual IIR bit accodring to the
per-platform interrupt mapping
- Injecting a MSI to VM
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index 2c03dad..29efe45 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -97,9 +97,10 @@
if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv)) {
info->max_support_vgpus = 8;
- info->mmio_size = 2 * 1024 * 1024;
info->cfg_space_size = 256;
+ info->mmio_size = 2 * 1024 * 1024;
info->mmio_bar = 0;
+ info->msi_cap_offset = IS_SKYLAKE(gvt->dev_priv) ? 0xac : 0x90;
}
}
@@ -118,6 +119,7 @@
if (WARN_ON(!gvt->initialized))
return;
+ intel_gvt_clean_irq(gvt);
intel_gvt_clean_mmio_info(gvt);
intel_gvt_free_firmware(gvt);
@@ -165,10 +167,16 @@
if (ret)
goto out_clean_mmio_info;
+ ret = intel_gvt_init_irq(gvt);
+ if (ret)
+ goto out_free_firmware;
+
gvt_dbg_core("gvt device creation is done\n");
gvt->initialized = true;
return 0;
+out_free_firmware:
+ intel_gvt_free_firmware(gvt);
out_clean_mmio_info:
intel_gvt_clean_mmio_info(gvt);
return ret;