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// SPDX-License-Identifier: MIT
/*
* Copyright © 2023 Intel Corporation
*/
#include <drm/drm_managed.h>
#include "xe_assert.h"
#include "xe_sriov.h"
/**
* xe_sriov_mode_to_string - Convert enum value to string.
* @mode: the &xe_sriov_mode to convert
*
* Returns: SR-IOV mode as a user friendly string.
*/
const char *xe_sriov_mode_to_string(enum xe_sriov_mode mode)
{
switch (mode) {
case XE_SRIOV_MODE_NONE:
return "none";
case XE_SRIOV_MODE_PF:
return "SR-IOV PF";
case XE_SRIOV_MODE_VF:
return "SR-IOV VF";
default:
return "<invalid>";
}
}
/**
* xe_sriov_probe_early - Probe a SR-IOV mode.
* @xe: the &xe_device to probe mode on
* @has_sriov: flag indicating hardware support for SR-IOV
*
* This function should be called only once and as soon as possible during
* driver probe to detect whether we are running a SR-IOV Physical Function
* (PF) or a Virtual Function (VF) device.
*
* SR-IOV PF mode detection is based on PCI @dev_is_pf() function.
* SR-IOV VF mode detection is based on dedicated MMIO register read.
*/
void xe_sriov_probe_early(struct xe_device *xe, bool has_sriov)
{
enum xe_sriov_mode mode = XE_SRIOV_MODE_NONE;
/* TODO: replace with proper mode detection */
xe_assert(xe, !has_sriov);
xe_assert(xe, !xe->sriov.__mode);
xe->sriov.__mode = mode;
xe_assert(xe, xe->sriov.__mode);
if (has_sriov)
drm_info(&xe->drm, "Running in %s mode\n",
xe_sriov_mode_to_string(xe_device_sriov_mode(xe)));
}
static void fini_sriov(struct drm_device *drm, void *arg)
{
struct xe_device *xe = arg;
destroy_workqueue(xe->sriov.wq);
xe->sriov.wq = NULL;
}
/**
* xe_sriov_init - Initialize SR-IOV specific data.
* @xe: the &xe_device to initialize
*
* In this function we create dedicated workqueue that will be used
* by the SR-IOV specific workers.
*
* Return: 0 on success or a negative error code on failure.
*/
int xe_sriov_init(struct xe_device *xe)
{
if (!IS_SRIOV(xe))
return 0;
xe_assert(xe, !xe->sriov.wq);
xe->sriov.wq = alloc_workqueue("xe-sriov-wq", 0, 0);
if (!xe->sriov.wq)
return -ENOMEM;
return drmm_add_action_or_reset(&xe->drm, fini_sriov, xe);
}
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