1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <dev/isci/isci.h> 35 36 #include <dev/pci/pcireg.h> 37 #include <dev/pci/pcivar.h> 38 39 #include <dev/isci/scil/scif_controller.h> 40 41 void isci_interrupt_legacy_handler(void *arg); 42 void isci_interrupt_msix_handler(void *arg); 43 44 static int 45 isci_interrupt_setup_legacy(struct isci_softc *isci) 46 { 47 struct ISCI_INTERRUPT_INFO *interrupt_info = &isci->interrupt_info[0]; 48 49 isci->num_interrupts = 1; 50 51 scic_controller_get_handler_methods(SCIC_LEGACY_LINE_INTERRUPT_TYPE, 52 0, &isci->handlers[0]); 53 54 interrupt_info->handlers = &isci->handlers[0]; 55 interrupt_info->rid = 0; 56 interrupt_info->interrupt_target_handle = (void *)isci; 57 58 interrupt_info->res = bus_alloc_resource_any(isci->device, SYS_RES_IRQ, 59 &interrupt_info->rid, RF_SHAREABLE|RF_ACTIVE); 60 61 if (interrupt_info->res == NULL) { 62 isci_log_message(0, "ISCI", "bus_alloc_resource failed\n"); 63 return (-1); 64 } 65 66 interrupt_info->tag = NULL; 67 if (bus_setup_intr(isci->device, interrupt_info->res, 68 INTR_TYPE_CAM | INTR_MPSAFE, NULL, isci_interrupt_legacy_handler, 69 interrupt_info, &interrupt_info->tag)) { 70 isci_log_message(0, "ISCI", "bus_setup_intr failed\n"); 71 return (-1); 72 } 73 74 return (0); 75 } 76 77 static int 78 isci_interrupt_setup_msix(struct isci_softc *isci) 79 { 80 uint32_t controller_index; 81 82 scic_controller_get_handler_methods(SCIC_MSIX_INTERRUPT_TYPE, 83 SCI_MAX_MSIX_MESSAGES_PER_CONTROLLER, &isci->handlers[0]); 84 85 for (controller_index = 0; controller_index < isci->controller_count; 86 controller_index++) { 87 uint32_t msix_index; 88 uint8_t base_index = controller_index * 89 SCI_MAX_MSIX_MESSAGES_PER_CONTROLLER; 90 91 for (msix_index = 0; msix_index < SCI_MAX_MSIX_MESSAGES_PER_CONTROLLER; 92 msix_index++) { 93 struct ISCI_INTERRUPT_INFO *info = 94 &isci->interrupt_info[base_index+msix_index]; 95 96 info->handlers = &isci->handlers[msix_index]; 97 info->interrupt_target_handle = 98 &isci->controllers[controller_index]; 99 100 info->rid = base_index+msix_index+1; 101 102 info->res = bus_alloc_resource_any(isci->device, 103 SYS_RES_IRQ, &info->rid, RF_ACTIVE); 104 if (info->res == NULL) { 105 isci_log_message(0, "ISCI", 106 "bus_alloc_resource failed\n"); 107 return (-1); 108 } 109 110 info->tag = NULL; 111 if (bus_setup_intr(isci->device, info->res, 112 INTR_TYPE_CAM | INTR_MPSAFE, NULL, 113 isci_interrupt_msix_handler, info, &info->tag)) { 114 isci_log_message(0, "ISCI", 115 "bus_setup_intr failed\n"); 116 return (-1); 117 } 118 } 119 } 120 121 return (0); 122 } 123 124 void 125 isci_interrupt_setup(struct isci_softc *isci) 126 { 127 uint8_t max_msix_messages = SCI_MAX_MSIX_MESSAGES_PER_CONTROLLER * 128 isci->controller_count; 129 BOOL use_msix = FALSE; 130 uint32_t force_legacy_interrupts = 0; 131 132 TUNABLE_INT_FETCH("hw.isci.force_legacy_interrupts", 133 &force_legacy_interrupts); 134 135 if (!force_legacy_interrupts && 136 pci_msix_count(isci->device) >= max_msix_messages) { 137 138 isci->num_interrupts = max_msix_messages; 139 if (pci_alloc_msix(isci->device, &isci->num_interrupts) == 0 && 140 isci->num_interrupts == max_msix_messages) 141 use_msix = TRUE; 142 } 143 144 if (use_msix == TRUE) 145 isci_interrupt_setup_msix(isci); 146 else 147 isci_interrupt_setup_legacy(isci); 148 } 149 150 void 151 isci_interrupt_legacy_handler(void *arg) 152 { 153 struct ISCI_INTERRUPT_INFO *interrupt_info = 154 (struct ISCI_INTERRUPT_INFO *)arg; 155 struct isci_softc *isci = 156 (struct isci_softc *)interrupt_info->interrupt_target_handle; 157 SCIC_CONTROLLER_INTERRUPT_HANDLER interrupt_handler; 158 SCIC_CONTROLLER_COMPLETION_HANDLER completion_handler; 159 int index; 160 161 interrupt_handler = interrupt_info->handlers->interrupt_handler; 162 completion_handler = interrupt_info->handlers->completion_handler; 163 164 for (index = 0; index < isci->controller_count; index++) { 165 struct ISCI_CONTROLLER *controller = &isci->controllers[index]; 166 167 /* If controller_count > 0, we will get interrupts here for 168 * controller 0 before controller 1 has even started. So 169 * we need to make sure we don't call the completion handler 170 * for a non-started controller. 171 */ 172 if (controller->is_started == TRUE) { 173 SCI_CONTROLLER_HANDLE_T scic_controller_handle = 174 scif_controller_get_scic_handle( 175 controller->scif_controller_handle); 176 177 if (interrupt_handler(scic_controller_handle)) { 178 mtx_lock(&controller->lock); 179 completion_handler(scic_controller_handle); 180 if (controller->release_queued_ccbs == TRUE) 181 isci_controller_release_queued_ccbs( 182 controller); 183 mtx_unlock(&controller->lock); 184 } 185 } 186 } 187 } 188 189 void 190 isci_interrupt_msix_handler(void *arg) 191 { 192 struct ISCI_INTERRUPT_INFO *interrupt_info = 193 (struct ISCI_INTERRUPT_INFO *)arg; 194 struct ISCI_CONTROLLER *controller = 195 (struct ISCI_CONTROLLER *)interrupt_info->interrupt_target_handle; 196 SCIC_CONTROLLER_INTERRUPT_HANDLER interrupt_handler; 197 SCIC_CONTROLLER_COMPLETION_HANDLER completion_handler; 198 199 interrupt_handler = interrupt_info->handlers->interrupt_handler; 200 completion_handler = interrupt_info->handlers->completion_handler; 201 202 SCI_CONTROLLER_HANDLE_T scic_controller_handle; 203 204 scic_controller_handle = scif_controller_get_scic_handle( 205 controller->scif_controller_handle); 206 207 if (interrupt_handler(scic_controller_handle)) { 208 mtx_lock(&controller->lock); 209 completion_handler(scic_controller_handle); 210 /* 211 * isci_controller_release_queued_ccb() is a relatively 212 * expensive routine, so we don't call it until the controller 213 * level flag is set to TRUE. 214 */ 215 if (controller->release_queued_ccbs == TRUE) 216 isci_controller_release_queued_ccbs(controller); 217 mtx_unlock(&controller->lock); 218 } 219 } 220 221 void 222 isci_interrupt_poll_handler(struct ISCI_CONTROLLER *controller) 223 { 224 SCI_CONTROLLER_HANDLE_T scic_controller = 225 scif_controller_get_scic_handle(controller->scif_controller_handle); 226 SCIC_CONTROLLER_HANDLER_METHODS_T handlers; 227 228 scic_controller_get_handler_methods(SCIC_NO_INTERRUPTS, 0x0, &handlers); 229 230 if(handlers.interrupt_handler(scic_controller) == TRUE) { 231 /* Do not acquire controller lock in this path. xpt 232 * poll routine will get called with this lock already 233 * held, so we can't acquire it again here. Other users 234 * of this function must acquire the lock explicitly 235 * before calling this handler. 236 */ 237 handlers.completion_handler(scic_controller); 238 } 239 } 240