1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2026 Intel Corporation 4 */ 5 6 #include "xe_device.h" 7 #include "xe_irq.h" 8 #include "xe_printk.h" 9 #include "xe_ras.h" 10 #include "xe_sysctrl.h" 11 #include "xe_sysctrl_event_types.h" 12 #include "xe_sysctrl_mailbox.h" 13 #include "xe_sysctrl_mailbox_types.h" 14 15 static void get_pending_event(struct xe_sysctrl *sc, struct xe_sysctrl_mailbox_command *command) 16 { 17 struct xe_sysctrl_event_response *response = command->data_out; 18 struct xe_device *xe = sc_to_xe(sc); 19 u32 count = XE_SYSCTRL_EVENT_FLOOD; 20 size_t len; 21 int ret; 22 23 do { 24 memset(response, 0, sizeof(*response)); 25 26 ret = xe_sysctrl_send_command(sc, command, &len); 27 if (ret) { 28 xe_err(xe, "sysctrl: failed to get pending event %d\n", ret); 29 return; 30 } 31 32 if (len != sizeof(*response)) { 33 xe_err(xe, "sysctrl: unexpected event response length %zu (expected %zu)\n", 34 len, sizeof(*response)); 35 return; 36 } 37 38 if (response->event == XE_SYSCTRL_EVENT_THRESHOLD_CROSSED) 39 xe_ras_counter_threshold_crossed(xe, response); 40 else 41 xe_warn(xe, "sysctrl: unexpected event %#x\n", response->event); 42 43 if (!--count) { 44 xe_err(xe, "sysctrl: event flooding\n"); 45 return; 46 } 47 48 xe_dbg(xe, "sysctrl: %u events pending\n", response->count); 49 } while (response->count); 50 } 51 52 static void event_request_prepare(struct xe_device *xe, struct xe_sysctrl_app_msg_hdr *header, 53 struct xe_sysctrl_event_request *request) 54 { 55 struct pci_dev *pdev = to_pci_dev(xe->drm.dev); 56 57 header->data = REG_FIELD_PREP(APP_HDR_GROUP_ID_MASK, XE_SYSCTRL_GROUP_GFSP) | 58 REG_FIELD_PREP(APP_HDR_COMMAND_MASK, XE_SYSCTRL_CMD_GET_PENDING_EVENT); 59 60 request->vector = xe_device_has_msix(xe) ? XE_IRQ_DEFAULT_MSIX : 0; 61 request->fn = PCI_FUNC(pdev->devfn); 62 } 63 64 /** 65 * xe_sysctrl_event() - Handler for System Controller events 66 * @sc: System Controller instance 67 * 68 * Handle events generated by System Controller. 69 */ 70 void xe_sysctrl_event(struct xe_sysctrl *sc) 71 { 72 struct xe_sysctrl_mailbox_command command = {}; 73 struct xe_sysctrl_event_response response = {}; 74 struct xe_sysctrl_event_request request = {}; 75 struct xe_sysctrl_app_msg_hdr header = {}; 76 77 xe_device_assert_mem_access(sc_to_xe(sc)); 78 event_request_prepare(sc_to_xe(sc), &header, &request); 79 80 command.header = header; 81 command.data_in = &request; 82 command.data_in_len = sizeof(request); 83 command.data_out = &response; 84 command.data_out_len = sizeof(response); 85 86 guard(mutex)(&sc->event_lock); 87 get_pending_event(sc, &command); 88 } 89