path: root/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c

/*
 * Copyright 2016 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#include <linux/module.h>

#ifdef CONFIG_X86
#include <asm/hypervisor.h>
#endif

#include <drm/drm_drv.h>
#include <xen/xen.h>

#include "amdgpu.h"
#include "amdgpu_ras.h"
#include "amdgpu_reset.h"
#include "vi.h"
#include "soc15.h"
#include "nv.h"

#define POPULATE_UCODE_INFO(vf2pf_info, ucode, ver) \
	do { \
		vf2pf_info->ucode_info[ucode].id = ucode; \
		vf2pf_info->ucode_info[ucode].version = ver; \
	} while (0)

bool amdgpu_virt_mmio_blocked(struct amdgpu_device *adev)
{
	/* By now all MMIO pages except mailbox are blocked */
	/* if blocking is enabled in hypervisor. Choose the */
	/* SCRATCH_REG0 to test. */
	return RREG32_NO_KIQ(0xc040) == 0xffffffff;
}

void amdgpu_virt_init_setting(struct amdgpu_device *adev)
{
	struct drm_device *ddev = adev_to_drm(adev);

	/* enable virtual display */
	if (adev->asic_type != CHIP_ALDEBARAN &&
	    adev->asic_type != CHIP_ARCTURUS &&
	    ((adev->pdev->class >> 8) != PCI_CLASS_ACCELERATOR_PROCESSING)) {
		if (adev->mode_info.num_crtc == 0)
			adev->mode_info.num_crtc = 1;
		adev->enable_virtual_display = true;
	}
	ddev->driver_features &= ~DRIVER_ATOMIC;
	adev->cg_flags = 0;
	adev->pg_flags = 0;

	/* Reduce kcq number to 2 to reduce latency */
	if (amdgpu_num_kcq == -1)
		amdgpu_num_kcq = 2;
}

/**
 * amdgpu_virt_request_full_gpu() - request full gpu access
 * @adev:	amdgpu device.
 * @init:	is driver init time.
 * When start to init/fini driver, first need to request full gpu access.
 * Return: Zero if request success, otherwise will return error.
 */
int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init)
{
	struct amdgpu_virt *virt = &adev->virt;
	int r;

	if (virt->ops && virt->ops->req_full_gpu) {
		r = virt->ops->req_full_gpu(adev, init);
		if (r)
			return r;

		adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
	}

	return 0;
}

/**
 * amdgpu_virt_release_full_gpu() - release full gpu access
 * @adev:	amdgpu device.
 * @init:	is driver init time.
 * When finishing driver init/fini, need to release full gpu access.
 * Return: Zero if release success, otherwise will returen error.
 */
int amdgpu_virt_release_full_gpu(struct amdgpu_device *adev, bool init)
{
	struct amdgpu_virt *virt = &adev->virt;
	int r;

	if (virt->ops && virt->ops->rel_full_gpu) {
		r = virt->ops->rel_full_gpu(adev, init);
		if (r)
			return r;

		adev->virt.caps |= AMDGPU_SRIOV_CAPS_RUNTIME;
	}
	return 0;
}

/**
 * amdgpu_virt_reset_gpu() - reset gpu
 * @adev:	amdgpu device.
 * Send reset command to GPU hypervisor to reset GPU that VM is using
 * Return: Zero if reset success, otherwise will return error.
 */
int amdgpu_virt_reset_gpu(struct amdgpu_device *adev)
{
	struct amdgpu_virt *virt = &adev->virt;
	int r;

	if (virt->ops && virt->ops->reset_gpu) {
		r = virt->ops->reset_gpu(adev);
		if (r)
			return r;

		adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
	}

	return 0;
}

void amdgpu_virt_request_init_data(struct amdgpu_device *adev)
{
	struct amdgpu_virt *virt = &adev->virt;

	if (virt->ops && virt->ops->req_init_data)
		virt->ops->req_init_data(adev);

	if (adev->virt.req_init_data_ver > 0)
		DRM_INFO("host supports REQ_INIT_DATA handshake\n");
	else
		DRM_WARN("host doesn't support REQ_INIT_DATA handshake\n");
}

/**
 * amdgpu_virt_ready_to_reset() - send ready to reset to host
 * @adev:	amdgpu device.
 * Send ready to reset message to GPU hypervisor to signal we have stopped GPU
 * activity and is ready for host FLR
 */
void amdgpu_virt_ready_to_reset(struct amdgpu_device *adev)
{
	struct amdgpu_virt *virt = &adev->virt;

	if (virt->ops && virt->ops->reset_gpu)
		virt->ops->ready_to_reset(adev);
}

/**
 * amdgpu_virt_wait_reset() - wait for reset gpu completed
 * @adev:	amdgpu device.
 * Wait for GPU reset completed.
 * Return: Zero if reset success, otherwise will return error.
 */
int amdgpu_virt_wait_reset(struct amdgpu_device *adev)
{