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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | // SPDX-License-Identifier: GPL-2.0 /* * Intel Speed Select Interface: MMIO Interface * Copyright (c) 2019, Intel Corporation. * All rights reserved. * * Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> */ #include <linux/module.h> #include <linux/pci.h> #include <linux/sched/signal.h> #include <linux/uaccess.h> #include <uapi/linux/isst_if.h> #include "isst_if_common.h" struct isst_mmio_range { int beg; int end; }; static struct isst_mmio_range mmio_range_devid_0[] = { {0x04, 0x14}, {0x20, 0xD0}, }; static struct isst_mmio_range mmio_range_devid_1[] = { {0x04, 0x14}, {0x20, 0x11C}, }; struct isst_if_device { void __iomem *punit_mmio; u32 range_0[5]; u32 range_1[64]; struct isst_mmio_range *mmio_range; struct mutex mutex; }; static long isst_if_mmio_rd_wr(u8 *cmd_ptr, int *write_only, int resume) { struct isst_if_device *punit_dev; struct isst_if_io_reg *io_reg; struct pci_dev *pdev; io_reg = (struct isst_if_io_reg *)cmd_ptr; if (io_reg->reg % 4) return -EINVAL; if (io_reg->read_write && !capable(CAP_SYS_ADMIN)) return -EPERM; pdev = isst_if_get_pci_dev(io_reg->logical_cpu, 0, 0, 1); if (!pdev) return -EINVAL; punit_dev = pci_get_drvdata(pdev); if (!punit_dev) return -EINVAL; if (io_reg->reg < punit_dev->mmio_range[0].beg || io_reg->reg > punit_dev->mmio_range[1].end) return -EINVAL; /* * Ensure that operation is complete on a PCI device to avoid read * write race by using per PCI device mutex. */ mutex_lock(&punit_dev->mutex); if (io_reg->read_write) { writel(io_reg->value, punit_dev->punit_mmio+io_reg->reg); *write_only = 1; } else { io_reg->value = readl(punit_dev->punit_mmio+io_reg->reg); *write_only = 0; } mutex_unlock(&punit_dev->mutex); return 0; } static const struct pci_device_id isst_if_ids[] = { { PCI_DEVICE_DATA(INTEL, RAPL_PRIO_DEVID_0, &mmio_range_devid_0)}, { PCI_DEVICE_DATA(INTEL, RAPL_PRIO_DEVID_1, &mmio_range_devid_1)}, { 0 }, }; MODULE_DEVICE_TABLE(pci, isst_if_ids); static int isst_if_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct isst_if_device *punit_dev; struct isst_if_cmd_cb cb; u32 mmio_base, pcu_base; u64 base_addr; int ret; punit_dev = devm_kzalloc(&pdev->dev, sizeof(*punit_dev), GFP_KERNEL); if (!punit_dev) return -ENOMEM; ret = pcim_enable_device(pdev); if (ret) return ret; ret = pci_read_config_dword(pdev, 0xD0, &mmio_base); if (ret) return ret; ret = pci_read_config_dword(pdev, 0xFC, &pcu_base); if (ret) return ret; pcu_base &= GENMASK(10, 0); base_addr = (u64)mmio_base << 23 | (u64) pcu_base << 12; punit_dev->punit_mmio = devm_ioremap(&pdev->dev, base_addr, 256); if (!punit_dev->punit_mmio) return -ENOMEM; mutex_init(&punit_dev->mutex); pci_set_drvdata(pdev, punit_dev); punit_dev->mmio_range = (struct isst_mmio_range *) ent->driver_data; memset(&cb, 0, sizeof(cb)); cb.cmd_size = sizeof(struct isst_if_io_reg); cb.offset = offsetof(struct isst_if_io_regs, io_reg); cb.cmd_callback = isst_if_mmio_rd_wr; cb.owner = THIS_MODULE; ret = isst_if_cdev_register(ISST_IF_DEV_MMIO, &cb); if (ret) mutex_destroy(&punit_dev->mutex); return ret; } static void isst_if_remove(struct pci_dev *pdev) { struct isst_if_device *punit_dev; punit_dev = pci_get_drvdata(pdev); isst_if_cdev_unregister(ISST_IF_DEV_MMIO); mutex_destroy(&punit_dev->mutex); } static int __maybe_unused isst_if_suspend(struct device *device) { struct isst_if_device *punit_dev = dev_get_drvdata(device); int i; for (i = 0; i < ARRAY_SIZE(punit_dev->range_0); ++i) punit_dev->range_0[i] = readl(punit_dev->punit_mmio + punit_dev->mmio_range[0].beg + 4 * i); for (i = 0; i < ARRAY_SIZE(punit_dev->range_1); ++i) { u32 addr; addr = punit_dev->mmio_range[1].beg + 4 * i; if (addr > punit_dev->mmio_range[1].end) break; punit_dev->range_1[i] = readl(punit_dev->punit_mmio + addr); } return 0; } static int __maybe_unused isst_if_resume(struct device *device) { struct isst_if_device *punit_dev = dev_get_drvdata(device); int i; for (i = 0; i < ARRAY_SIZE(punit_dev->range_0); ++i) writel(punit_dev->range_0[i], punit_dev->punit_mmio + punit_dev->mmio_range[0].beg + 4 * i); for (i = 0; i < ARRAY_SIZE(punit_dev->range_1); ++i) { u32 addr; addr = punit_dev->mmio_range[1].beg + 4 * i; if (addr > punit_dev->mmio_range[1].end) break; writel(punit_dev->range_1[i], punit_dev->punit_mmio + addr); } return 0; } static SIMPLE_DEV_PM_OPS(isst_if_pm_ops, isst_if_suspend, isst_if_resume); static struct pci_driver isst_if_pci_driver = { .name = "isst_if_pci", .id_table = isst_if_ids, .probe = isst_if_probe, .remove = isst_if_remove, .driver.pm = &isst_if_pm_ops, }; module_pci_driver(isst_if_pci_driver); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("Intel speed select interface mmio driver"); |