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1// SPDX-License-Identifier: MIT2/*3 * Copyright © 2023 Intel Corporation4 */5 6#include <drm/drm_managed.h>7 8#include "regs/xe_regs.h"9 10#include "xe_assert.h"11#include "xe_device.h"12#include "xe_mmio.h"13#include "xe_sriov.h"14#include "xe_sriov_pf.h"15 16/**17 * xe_sriov_mode_to_string - Convert enum value to string.18 * @mode: the &xe_sriov_mode to convert19 *20 * Returns: SR-IOV mode as a user friendly string.21 */22const char *xe_sriov_mode_to_string(enum xe_sriov_mode mode)23{24 switch (mode) {25 case XE_SRIOV_MODE_NONE:26 return "none";27 case XE_SRIOV_MODE_PF:28 return "SR-IOV PF";29 case XE_SRIOV_MODE_VF:30 return "SR-IOV VF";31 default:32 return "<invalid>";33 }34}35 36static bool test_is_vf(struct xe_device *xe)37{38 u32 value = xe_mmio_read32(xe_root_mmio_gt(xe), VF_CAP_REG);39 40 return value & VF_CAP;41}42 43/**44 * xe_sriov_probe_early - Probe a SR-IOV mode.45 * @xe: the &xe_device to probe mode on46 *47 * This function should be called only once and as soon as possible during48 * driver probe to detect whether we are running a SR-IOV Physical Function49 * (PF) or a Virtual Function (VF) device.50 *51 * SR-IOV PF mode detection is based on PCI @dev_is_pf() function.52 * SR-IOV VF mode detection is based on dedicated MMIO register read.53 */54void xe_sriov_probe_early(struct xe_device *xe)55{56 struct pci_dev *pdev = to_pci_dev(xe->drm.dev);57 enum xe_sriov_mode mode = XE_SRIOV_MODE_NONE;58 bool has_sriov = xe->info.has_sriov;59 60 if (has_sriov) {61 if (test_is_vf(xe))62 mode = XE_SRIOV_MODE_VF;63 else if (xe_sriov_pf_readiness(xe))64 mode = XE_SRIOV_MODE_PF;65 } else if (pci_sriov_get_totalvfs(pdev)) {66 /*67 * Even if we have not enabled SR-IOV support using the68 * platform specific has_sriov flag, the hardware may still69 * report SR-IOV capability and the PCI layer may wrongly70 * advertise driver support to enable VFs. Explicitly reset71 * the number of supported VFs to zero to avoid confusion.72 */73 drm_info(&xe->drm, "Support for SR-IOV is not available\n");74 pci_sriov_set_totalvfs(pdev, 0);75 }76 77 xe_assert(xe, !xe->sriov.__mode);78 xe->sriov.__mode = mode;79 xe_assert(xe, xe->sriov.__mode);80 81 if (has_sriov)82 drm_info(&xe->drm, "Running in %s mode\n",83 xe_sriov_mode_to_string(xe_device_sriov_mode(xe)));84}85 86static void fini_sriov(struct drm_device *drm, void *arg)87{88 struct xe_device *xe = arg;89 90 destroy_workqueue(xe->sriov.wq);91 xe->sriov.wq = NULL;92}93 94/**95 * xe_sriov_init - Initialize SR-IOV specific data.96 * @xe: the &xe_device to initialize97 *98 * In this function we create dedicated workqueue that will be used99 * by the SR-IOV specific workers.100 *101 * Return: 0 on success or a negative error code on failure.102 */103int xe_sriov_init(struct xe_device *xe)104{105 if (!IS_SRIOV(xe))106 return 0;107 108 if (IS_SRIOV_PF(xe)) {109 int err = xe_sriov_pf_init_early(xe);110 111 if (err)112 return err;113 }114 115 xe_assert(xe, !xe->sriov.wq);116 xe->sriov.wq = alloc_workqueue("xe-sriov-wq", 0, 0);117 if (!xe->sriov.wq)118 return -ENOMEM;119 120 return drmm_add_action_or_reset(&xe->drm, fini_sriov, xe);121}122 123/**124 * xe_sriov_print_info - Print basic SR-IOV information.125 * @xe: the &xe_device to print info from126 * @p: the &drm_printer127 *128 * Print SR-IOV related information into provided DRM printer.129 */130void xe_sriov_print_info(struct xe_device *xe, struct drm_printer *p)131{132 drm_printf(p, "supported: %s\n", str_yes_no(xe_device_has_sriov(xe)));133 drm_printf(p, "enabled: %s\n", str_yes_no(IS_SRIOV(xe)));134 drm_printf(p, "mode: %s\n", xe_sriov_mode_to_string(xe_device_sriov_mode(xe)));135}136 137/**138 * xe_sriov_function_name() - Get SR-IOV Function name.139 * @n: the Function number (identifier) to get name of140 * @buf: the buffer to format to141 * @size: size of the buffer (shall be at least 5 bytes)142 *143 * Return: formatted function name ("PF" or "VF%u").144 */145const char *xe_sriov_function_name(unsigned int n, char *buf, size_t size)146{147 if (n)148 snprintf(buf, size, "VF%u", n);149 else150 strscpy(buf, "PF", size);151 return buf;152}153