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We will be adding support for the SR-IOV and driver might be then running, in addition to existing non-virtualized bare-metal mode, also in Physical Function (PF) or Virtual Function (VF) mode. Since these additional modes require some changes to the driver, define enum flag to represent different SR-IOV modes and add a function where we will detect the actual mode in the runtime. We start with a forced bare-metal mode as it is sufficient to enable basic functionality and ensures no impact to existing code. Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Link: https://lore.kernel.org/r/20231115073804.1861-2-michal.wajdeczko@intel.com Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2023 Intel Corporation
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*/
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#include "xe_assert.h"
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#include "xe_sriov.h"
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/**
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* xe_sriov_mode_to_string - Convert enum value to string.
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* @mode: the &xe_sriov_mode to convert
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*
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* Returns: SR-IOV mode as a user friendly string.
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*/
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const char *xe_sriov_mode_to_string(enum xe_sriov_mode mode)
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{
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switch (mode) {
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case XE_SRIOV_MODE_NONE:
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return "none";
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case XE_SRIOV_MODE_PF:
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return "SR-IOV PF";
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case XE_SRIOV_MODE_VF:
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return "SR-IOV VF";
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default:
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return "<invalid>";
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}
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}
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/**
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* xe_sriov_probe_early - Probe a SR-IOV mode.
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* @xe: the &xe_device to probe mode on
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* @has_sriov: flag indicating hardware support for SR-IOV
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*
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* This function should be called only once and as soon as possible during
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* driver probe to detect whether we are running a SR-IOV Physical Function
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* (PF) or a Virtual Function (VF) device.
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*
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* SR-IOV PF mode detection is based on PCI @dev_is_pf() function.
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* SR-IOV VF mode detection is based on dedicated MMIO register read.
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*/
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void xe_sriov_probe_early(struct xe_device *xe, bool has_sriov)
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{
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enum xe_sriov_mode mode = XE_SRIOV_MODE_NONE;
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/* TODO: replace with proper mode detection */
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xe_assert(xe, !has_sriov);
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xe_assert(xe, !xe->sriov.__mode);
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xe->sriov.__mode = mode;
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xe_assert(xe, xe->sriov.__mode);
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if (has_sriov)
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drm_info(&xe->drm, "Running in %s mode\n",
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xe_sriov_mode_to_string(xe_device_sriov_mode(xe)));
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}
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