| 1 | /* |
| 2 | * Copyright 2010-2017 Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * Disclaimer: The codes contained in these modules may be specific to |
| 14 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 15 | * and the Intel product codenamed Knights Corner, and are not backward |
| 16 | * compatible with other Intel products. Additionally, Intel will NOT |
| 17 | * support the codes or instruction set in future products. |
| 18 | * |
| 19 | * Intel offers no warranty of any kind regarding the code. This code is |
| 20 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 21 | * any support, assistance, installation, training, or other services |
| 22 | * of any kind. Intel is also not obligated to provide any updates, |
| 23 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 24 | * of merchantability, non-infringement, fitness for any particular |
| 25 | * purpose, and any other warranty. |
| 26 | * |
| 27 | * Further, Intel disclaims all liability of any kind, including but |
| 28 | * not limited to liability for infringement of any proprietary rights, |
| 29 | * relating to the use of the code, even if Intel is notified of the |
| 30 | * possibility of such liability. Except as expressly stated in an Intel |
| 31 | * license agreement provided with this code and agreed upon with Intel, |
| 32 | * no license, express or implied, by estoppel or otherwise, to any |
| 33 | * intellectual property rights is granted herein. |
| 34 | */ |
| 35 | |
| 36 | #include <linux/errno.h> |
| 37 | #include <linux/hardirq.h> |
| 38 | #include <linux/types.h> |
| 39 | #include <linux/capability.h> |
| 40 | #include <linux/slab.h> |
| 41 | #include <linux/string.h> |
| 42 | #include <linux/gfp.h> |
| 43 | #include <linux/vmalloc.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <linux/kernel.h> |
| 46 | #include <linux/mm_types.h> |
| 47 | #include <linux/jiffies.h> |
| 48 | #include <linux/timer.h> |
| 49 | #include <linux/irqflags.h> |
| 50 | #include <linux/time.h> |
| 51 | #include <linux/spinlock.h> |
| 52 | #include <linux/mutex.h> |
| 53 | #include <linux/semaphore.h> |
| 54 | #include <linux/kthread.h> |
| 55 | #include <linux/sched.h> |
| 56 | #include <linux/delay.h> |
| 57 | #include <linux/wait.h> |
| 58 | #include <asm/bug.h> |
| 59 | #include <linux/pci.h> |
| 60 | #include <linux/device.h> |
| 61 | #include <linux/fs.h> |
| 62 | #include <linux/list.h> |
| 63 | #include <linux/workqueue.h> |
| 64 | #include <linux/interrupt.h> |
| 65 | #include <asm/atomic.h> |
| 66 | #include <linux/netdevice.h> |
| 67 | #include <linux/debugfs.h> |
| 68 | #include "micint.h" |
| 69 | #include "mic/micveth.h" |
| 70 | |
| 71 | /* |
| 72 | * Retrieves the device context for a particular device |
| 73 | */ |
| 74 | mic_ctx_t * |
| 75 | get_device_context(struct pci_dev *dev) { |
| 76 | int i = 0; |
| 77 | mic_ctx_t *mic_ctx = NULL; |
| 78 | for (i = (mic_data.dd_numdevs -1); i >= 0; i--) { |
| 79 | mic_ctx = &mic_data.dd_bi[i]->bi_ctx; |
| 80 | if (mic_ctx!= NULL) { |
| 81 | //TODO: Is bus number enough to uniquely identify a |
| 82 | //pci_dev struct in mic_ctx? |
| 83 | if (mic_ctx->bi_pdev->bus->number == |
| 84 | dev->bus->number) { |
| 85 | |
| 86 | //Bus number matches |
| 87 | break; |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | return mic_ctx; |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Notifier callback with event specifying the actual power management |
| 96 | * event to have happened.Our events of Interest right now are: |
| 97 | * PM_HIBERNATION_PREPARE and PM_POST_RESTORE |
| 98 | */ |
| 99 | int |
| 100 | micpm_notifier_block(struct notifier_block *nb, unsigned long event, void *dummy) |
| 101 | { |
| 102 | int i; |
| 103 | mic_ctx_t *mic_ctx; |
| 104 | switch (event) { |
| 105 | case PM_POST_RESTORE: |
| 106 | case PM_POST_SUSPEND: |
| 107 | case PM_POST_HIBERNATION: |
| 108 | pr_debug("%s Calling MIC resume\n", __func__); |
| 109 | for(i = 0; i < mic_data.dd_numdevs; i++) { |
| 110 | mic_ctx = get_per_dev_ctx(i); |
| 111 | if (mic_ctx && mic_ctx->micpm_ctx.resume.wq) { |
| 112 | queue_work(mic_ctx->micpm_ctx.resume.wq, |
| 113 | &mic_ctx->micpm_ctx.resume.work); |
| 114 | } |
| 115 | } |
| 116 | break; |
| 117 | default: |
| 118 | pr_debug("%s: Unrecognized event %lu\n", __func__, event); |
| 119 | break; |
| 120 | } |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Called by the OS when going into suspend. |
| 126 | * Puts our device to D3Cold. |
| 127 | */ |
| 128 | int |
| 129 | micpm_suspend(struct device *pdev) |
| 130 | { |
| 131 | struct pci_dev *pci_dev = to_pci_dev(pdev); |
| 132 | mic_ctx_t *mic_ctx = get_device_context(pci_dev); |
| 133 | |
| 134 | if (!pci_dev) { |
| 135 | pr_debug("Not initialized, aborting suspend.\n"); |
| 136 | return -ENODEV; |
| 137 | } |
| 138 | |
| 139 | pr_debug("pm_stop_device called for dev: %d:%d:%d\n", pci_dev->bus->number, |
| 140 | PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn)); |
| 141 | pm_stop_device(mic_ctx); |
| 142 | pci_save_state(pci_dev); |
| 143 | pci_disable_device(pci_dev); |
| 144 | if (pci_set_power_state(pci_dev, PCI_D3cold)) |
| 145 | pr_debug("Not able to set to D3Cold state\n"); |
| 146 | pr_debug("Returning from mic_suspend\n"); |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | /* |
| 151 | * Called by the OS when coming out of suspend. |
| 152 | * Puts our device to D0 and starts driver components. |
| 153 | */ |
| 154 | int |
| 155 | micpm_resume(struct device *pdev) |
| 156 | { |
| 157 | struct pci_dev *pci_dev = to_pci_dev(pdev); |
| 158 | if (!pci_dev) { |
| 159 | pr_debug("Device not initialized. aborting resume"); |
| 160 | return -ENODEV; |
| 161 | } |
| 162 | |
| 163 | pci_set_power_state(pci_dev, PCI_D0); |
| 164 | if (pci_enable_device(pci_dev)) { |
| 165 | pr_debug("Failed to wake-up device.\n"); |
| 166 | return -EIO; |
| 167 | } |
| 168 | pci_restore_state(pci_dev); |
| 169 | pci_set_master(pci_dev); |
| 170 | pr_debug("pm_start_device called for dev: %d:%d:%d\n", pci_dev->bus->number, |
| 171 | PCI_SLOT(pci_dev->devfn), PCI_FUNC(pci_dev->devfn)); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | int micpm_suspend_noirq(struct device *pdev) { |
| 176 | |
| 177 | struct pci_dev *pci_dev = to_pci_dev(pdev); |
| 178 | mic_ctx_t *mic_ctx; |
| 179 | bd_info_t *bd_info; |
| 180 | |
| 181 | if (!pci_dev) { |
| 182 | pr_debug("Device not initialized. aborting suspend"); |
| 183 | return -ENODEV; |
| 184 | } |
| 185 | |
| 186 | mic_ctx = get_device_context(pci_dev); |
| 187 | if(mic_ctx) { |
| 188 | bd_info = mic_ctx->bd_info; |
| 189 | /* MSI interrupts do not work on resume. |
| 190 | * See http://www.digipedia.pl/usenet/thread/18815/2513/ |
| 191 | * for a discussion on this issue. |
| 192 | */ |
| 193 | if (mic_ctx->msie) { |
| 194 | free_irq(bd_info->bi_msix_entries[0].vector, &bd_info->bi_ctx); |
| 195 | } |
| 196 | } |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | int micpm_resume_noirq(struct device *pdev) { |
| 201 | |
| 202 | struct pci_dev *pci_dev = to_pci_dev(pdev); |
| 203 | mic_ctx_t *mic_ctx; |
| 204 | bd_info_t *bd_info; |
| 205 | int err; |
| 206 | |
| 207 | if (!pci_dev) { |
| 208 | pr_debug("Device not initialized. aborting resume"); |
| 209 | return -ENODEV; |
| 210 | } |
| 211 | mic_ctx = get_device_context(pci_dev); |
| 212 | if(mic_ctx) { |
| 213 | bd_info = mic_ctx->bd_info; |
| 214 | |
| 215 | /* MSI interrupts do not work on resume. |
| 216 | * See http://www.digipedia.pl/usenet/thread/18815/2513/ |
| 217 | * for a discussion on this issue. |
| 218 | */ |
| 219 | if (mic_ctx->msie) { |
| 220 | err = request_irq(bd_info->bi_msix_entries[0].vector, |
| 221 | mic_irq_isr, 0, "mic", mic_ctx); |
| 222 | if (err) { |
| 223 | pr_debug("%s: %d Error inititalizing MSI interrupts\n", |
| 224 | __func__, __LINE__); |
| 225 | return 0; |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | } |
| 230 | return 0; |
| 231 | } |
| 232 | |