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Commit c8fe6a68 authored by Zhi Wang's avatar Zhi Wang Committed by Zhenyu Wang
Browse files

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: default avatarZhi Wang <zhi.a.wang@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent 3f728236

drivers/gpu/drm/i915/gvt/Makefile

+2 −1
Original line number Diff line number Diff line 
GVT_DIR := gvt

GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o

GVT_SOURCE := gvt.o aperture_gm.o handlers.o vgpu.o trace_points.o firmware.o \

	interrupt.o



ccflags-y                      += -I$(src) -I$(src)/$(GVT_DIR) -Wall

i915-y			       += $(addprefix $(GVT_DIR)/, $(GVT_SOURCE))

drivers/gpu/drm/i915/gvt/debug.h

+2 −3
Original line number Diff line number Diff line
@@ -30,8 +30,7 @@ 
#define gvt_dbg_core(fmt, args...) \

	DRM_DEBUG_DRIVER("gvt: core: "fmt, ##args)



/*

 * Other GVT debug stuff will be introduced in the GVT device model patches.

 */

#define gvt_dbg_irq(fmt, args...) \

	DRM_DEBUG_DRIVER("gvt: irq: "fmt, ##args)



#endif

drivers/gpu/drm/i915/gvt/gvt.c

+9 −1
Original line number Diff line number Diff line
@@ -97,9 +97,10 @@ static void init_device_info(struct intel_gvt *gvt) 


	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 @@ void intel_gvt_clean_device(struct drm_i915_private *dev_priv) 
	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 @@ int intel_gvt_init_device(struct drm_i915_private *dev_priv) 
	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;

drivers/gpu/drm/i915/gvt/gvt.h

+9 −1
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 
#include "hypercall.h"

#include "mmio.h"

#include "reg.h"

#include "interrupt.h"



#define GVT_MAX_VGPU 8
@@ -56,9 +57,10 @@ extern struct intel_gvt_host intel_gvt_host; 
/* Describe per-platform limitations. */

struct intel_gvt_device_info {

	u32 max_support_vgpus;

	u32 mmio_size;

	u32 cfg_space_size;

	u32 mmio_size;

	u32 mmio_bar;

	unsigned long msi_cap_offset;

};



/* GM resources owned by a vGPU */
@@ -98,6 +100,10 @@ struct intel_vgpu_cfg_space { 


#define vgpu_cfg_space(vgpu) ((vgpu)->cfg_space.virtual_cfg_space)



struct intel_vgpu_irq {

	bool irq_warn_once[INTEL_GVT_EVENT_MAX];

};



struct intel_vgpu {

	struct intel_gvt *gvt;

	int id;
@@ -109,6 +115,7 @@ struct intel_vgpu { 
	struct intel_vgpu_gm gm;

	struct intel_vgpu_cfg_space cfg_space;

	struct intel_vgpu_mmio mmio;

	struct intel_vgpu_irq irq;

};



struct intel_gvt_gm {
@@ -145,6 +152,7 @@ struct intel_gvt { 
	struct intel_gvt_fence fence;

	struct intel_gvt_mmio mmio;

	struct intel_gvt_firmware firmware;

	struct intel_gvt_irq irq;

};



void intel_gvt_free_firmware(struct intel_gvt *gvt);

drivers/gpu/drm/i915/gvt/hypercall.h

+1 −0
Original line number Diff line number Diff line
@@ -41,6 +41,7 @@ struct intel_gvt_mpt { 
	int (*detect_host)(void);

	int (*attach_vgpu)(void *vgpu, unsigned long *handle);

	void (*detach_vgpu)(unsigned long handle);

	int (*inject_msi)(unsigned long handle, u32 addr, u16 data);

};



extern struct intel_gvt_mpt xengt_mpt;