diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c | 1454 |
1 files changed, 1454 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c new file mode 100644 index 000000000000..02f7328bd6ce --- /dev/null +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c @@ -0,0 +1,1454 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2023-2024 Intel Corporation + */ + +#include <drm/drm_managed.h> + +#include "abi/guc_actions_sriov_abi.h" + +#include "xe_device.h" +#include "xe_gt.h" +#include "xe_gt_sriov_pf_config.h" +#include "xe_gt_sriov_pf_control.h" +#include "xe_gt_sriov_pf_helpers.h" +#include "xe_gt_sriov_pf_monitor.h" +#include "xe_gt_sriov_pf_service.h" +#include "xe_gt_sriov_printk.h" +#include "xe_guc_ct.h" +#include "xe_sriov.h" + +static const char *control_cmd_to_string(u32 cmd) +{ + switch (cmd) { + case GUC_PF_TRIGGER_VF_PAUSE: + return "PAUSE"; + case GUC_PF_TRIGGER_VF_RESUME: + return "RESUME"; + case GUC_PF_TRIGGER_VF_STOP: + return "STOP"; + case GUC_PF_TRIGGER_VF_FLR_START: + return "FLR_START"; + case GUC_PF_TRIGGER_VF_FLR_FINISH: + return "FLR_FINISH"; + default: + return "<unknown>"; + } +} + +static int guc_action_vf_control_cmd(struct xe_guc *guc, u32 vfid, u32 cmd) +{ + u32 request[PF2GUC_VF_CONTROL_REQUEST_MSG_LEN] = { + FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) | + FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) | + FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, GUC_ACTION_PF2GUC_VF_CONTROL), + FIELD_PREP(PF2GUC_VF_CONTROL_REQUEST_MSG_1_VFID, vfid), + FIELD_PREP(PF2GUC_VF_CONTROL_REQUEST_MSG_2_COMMAND, cmd), + }; + int ret; + + ret = xe_guc_ct_send_block(&guc->ct, request, ARRAY_SIZE(request)); + return ret > 0 ? -EPROTO : ret; +} + +static int pf_send_vf_control_cmd(struct xe_gt *gt, unsigned int vfid, u32 cmd) +{ + int err; + + xe_gt_assert(gt, vfid != PFID); + xe_gt_sriov_dbg_verbose(gt, "sending VF%u control command %s\n", + vfid, control_cmd_to_string(cmd)); + + err = guc_action_vf_control_cmd(>->uc.guc, vfid, cmd); + if (unlikely(err)) + xe_gt_sriov_err(gt, "VF%u control command %s failed (%pe)\n", + vfid, control_cmd_to_string(cmd), ERR_PTR(err)); + return err; +} + +static int pf_send_vf_pause(struct xe_gt *gt, unsigned int vfid) +{ + return pf_send_vf_control_cmd(gt, vfid, GUC_PF_TRIGGER_VF_PAUSE); +} + +static int pf_send_vf_resume(struct xe_gt *gt, unsigned int vfid) +{ + return pf_send_vf_control_cmd(gt, vfid, GUC_PF_TRIGGER_VF_RESUME); +} + +static int pf_send_vf_stop(struct xe_gt *gt, unsigned int vfid) +{ + return pf_send_vf_control_cmd(gt, vfid, GUC_PF_TRIGGER_VF_STOP); +} + +static int pf_send_vf_flr_start(struct xe_gt *gt, unsigned int vfid) +{ + return pf_send_vf_control_cmd(gt, vfid, GUC_PF_TRIGGER_VF_FLR_START); +} + +static int pf_send_vf_flr_finish(struct xe_gt *gt, unsigned int vfid) +{ + return pf_send_vf_control_cmd(gt, vfid, GUC_PF_TRIGGER_VF_FLR_FINISH); +} + +/** + * DOC: The VF state machine + * + * The simplified VF state machine could be presented as:: + * + * pause--------------------------o + * / | + * / v + * (READY)<------------------resume-----(PAUSED) + * ^ \ / / + * | \ / / + * | stop---->(STOPPED)<----stop / + * | / / + * | / / + * o--------<-----flr / + * \ / + * o------<--------------------flr + * + * Where: + * + * * READY - represents a state in which VF is fully operable + * * PAUSED - represents a state in which VF activity is temporarily suspended + * * STOPPED - represents a state in which VF activity is definitely halted + * * pause - represents a request to temporarily suspend VF activity + * * resume - represents a request to resume VF activity + * * stop - represents a request to definitely halt VF activity + * * flr - represents a request to perform VF FLR to restore VF activity + * + * However, each state transition requires additional steps that involves + * communication with GuC that might fail or be interrupted by other requests:: + * + * .................................WIP.... + * : : + * pause--------------------->PAUSE_WIP----------------------------o + * / : / \ : | + * / : o----<---stop flr--o : | + * / : | \ / | : V + * (READY,RESUMED)<--------+------------RESUME_WIP<----+--<-----resume--(PAUSED) + * ^ \ \ : | | : / / + * | \ \ : | | : / / + * | \ \ : | | : / / + * | \ \ : o----<----------------------+--<-------stop / + * | \ \ : | | : / + * | \ \ : V | : / + * | \ stop----->STOP_WIP---------flr--->-----o : / + * | \ : | | : / + * | \ : | V : / + * | flr--------+----->----------------->FLR_WIP<-----flr + * | : | / ^ : + * | : | / | : + * o--------<-------:----+-----<----------------o | : + * : | | : + * :....|...........................|.....: + * | | + * V | + * (STOPPED)--------------------flr + * + * For details about each internal WIP state machine see: + * + * * `The VF PAUSE state machine`_ + * * `The VF RESUME state machine`_ + * * `The VF STOP state machine`_ + * * `The VF FLR state machine`_ + */ + +#ifdef CONFIG_DRM_XE_DEBUG_SRIOV +static const char *control_bit_to_string(enum xe_gt_sriov_control_bits bit) +{ + switch (bit) { +#define CASE2STR(_X) \ + case XE_GT_SRIOV_STATE_##_X: return #_X + CASE2STR(WIP); + CASE2STR(FLR_WIP); + CASE2STR(FLR_SEND_START); + CASE2STR(FLR_WAIT_GUC); + CASE2STR(FLR_GUC_DONE); + CASE2STR(FLR_RESET_CONFIG); + CASE2STR(FLR_RESET_DATA); + CASE2STR(FLR_RESET_MMIO); + CASE2STR(FLR_SEND_FINISH); + CASE2STR(FLR_FAILED); + CASE2STR(PAUSE_WIP); + CASE2STR(PAUSE_SEND_PAUSE); + CASE2STR(PAUSE_WAIT_GUC); + CASE2STR(PAUSE_GUC_DONE); + CASE2STR(PAUSE_FAILED); + CASE2STR(PAUSED); + CASE2STR(RESUME_WIP); + CASE2STR(RESUME_SEND_RESUME); + CASE2STR(RESUME_FAILED); + CASE2STR(RESUMED); + CASE2STR(STOP_WIP); + CASE2STR(STOP_SEND_STOP); + CASE2STR(STOP_FAILED); + CASE2STR(STOPPED); + CASE2STR(MISMATCH); +#undef CASE2STR + default: return "?"; + } +} +#endif + +static unsigned long pf_get_default_timeout(enum xe_gt_sriov_control_bits bit) +{ + switch (bit) { + case XE_GT_SRIOV_STATE_FLR_WAIT_GUC: + case XE_GT_SRIOV_STATE_PAUSE_WAIT_GUC: + return HZ / 2; + case XE_GT_SRIOV_STATE_FLR_WIP: + case XE_GT_SRIOV_STATE_FLR_RESET_CONFIG: + return 5 * HZ; + default: + return HZ; + } +} + +static struct xe_gt_sriov_control_state *pf_pick_vf_control(struct xe_gt *gt, unsigned int vfid) +{ + xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt))); + xe_gt_assert(gt, vfid <= xe_gt_sriov_pf_get_totalvfs(gt)); + + return >->sriov.pf.vfs[vfid].control; +} + +static unsigned long *pf_peek_vf_state(struct xe_gt *gt, unsigned int vfid) +{ + struct xe_gt_sriov_control_state *cs = pf_pick_vf_control(gt, vfid); + + return &cs->state; +} + +static bool pf_check_vf_state(struct xe_gt *gt, unsigned int vfid, + enum xe_gt_sriov_control_bits bit) +{ + return test_bit(bit, pf_peek_vf_state(gt, vfid)); +} + +static void pf_dump_vf_state(struct xe_gt *gt, unsigned int vfid) +{ + unsigned long state = *pf_peek_vf_state(gt, vfid); + enum xe_gt_sriov_control_bits bit; + + if (state) { + xe_gt_sriov_dbg_verbose(gt, "VF%u state %#lx%s%*pbl\n", + vfid, state, state ? " bits " : "", + (int)BITS_PER_LONG, &state); + for_each_set_bit(bit, &state, BITS_PER_LONG) + xe_gt_sriov_dbg_verbose(gt, "VF%u state %s(%d)\n", + vfid, control_bit_to_string(bit), bit); + } else { + xe_gt_sriov_dbg_verbose(gt, "VF%u state READY\n", vfid); + } +} + +static bool pf_expect_vf_state(struct xe_gt *gt, unsigned int vfid, + enum xe_gt_sriov_control_bits bit) +{ + bool result = pf_check_vf_state(gt, vfid, bit); + + if (unlikely(!result)) + pf_dump_vf_state(gt, vfid); + + return result; +} + +static bool pf_expect_vf_not_state(struct xe_gt *gt, unsigned int vfid, + enum xe_gt_sriov_control_bits bit) +{ + bool result = !pf_check_vf_state(gt, vfid, bit); + + if (unlikely(!result)) + pf_dump_vf_state(gt, vfid); + + return result; +} + +static bool pf_enter_vf_state(struct xe_gt *gt, unsigned int vfid, + enum xe_gt_sriov_control_bits bit) +{ + if (!test_and_set_bit(bit, pf_peek_vf_state(gt, vfid))) { + xe_gt_sriov_dbg_verbose(gt, "VF%u state %s(%d) enter\n", + vfid, control_bit_to_string(bit), bit); + return true; + } + return false; +} + +static bool pf_exit_vf_state(struct xe_gt *gt, unsigned int vfid, + enum xe_gt_sriov_control_bits bit) +{ + if (test_and_clear_bit(bit, pf_peek_vf_state(gt, vfid))) { + xe_gt_sriov_dbg_verbose(gt, "VF%u state %s(%d) exit\n", + vfid, control_bit_to_string(bit), bit); + return true; + } + return false; +} + +static void pf_escape_vf_state(struct xe_gt *gt, unsigned int vfid, + enum xe_gt_sriov_control_bits bit) +{ + if (pf_exit_vf_state(gt, vfid, bit)) + xe_gt_sriov_dbg_verbose(gt, "VF%u state %s(%d) escaped by %ps\n", + vfid, control_bit_to_string(bit), bit, + __builtin_return_address(0)); +} + +static void pf_enter_vf_mismatch(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_MISMATCH)) { + xe_gt_sriov_dbg(gt, "VF%u state mismatch detected by %ps\n", + vfid, __builtin_return_address(0)); + pf_dump_vf_state(gt, vfid); + } +} + +static void pf_exit_vf_mismatch(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_MISMATCH)) + xe_gt_sriov_dbg(gt, "VF%u state mismatch cleared by %ps\n", + vfid, __builtin_return_address(0)); + + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_FAILED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_FAILED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_FAILED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_FAILED); +} + +#define pf_enter_vf_state_machine_bug(gt, vfid) ({ \ + pf_enter_vf_mismatch((gt), (vfid)); \ +}) + +static void pf_queue_control_worker(struct xe_gt *gt) +{ + struct xe_device *xe = gt_to_xe(gt); + + xe_gt_assert(gt, IS_SRIOV_PF(xe)); + + queue_work(xe->sriov.wq, >->sriov.pf.control.worker); +} + +static void pf_queue_vf(struct xe_gt *gt, unsigned int vfid) +{ + struct xe_gt_sriov_pf_control *pfc = >->sriov.pf.control; + + xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt))); + + spin_lock(&pfc->lock); + list_move_tail(>->sriov.pf.vfs[vfid].control.link, &pfc->list); + spin_unlock(&pfc->lock); + + pf_queue_control_worker(gt); +} + +static void pf_exit_vf_flr_wip(struct xe_gt *gt, unsigned int vfid); +static void pf_exit_vf_stop_wip(struct xe_gt *gt, unsigned int vfid); +static void pf_exit_vf_pause_wip(struct xe_gt *gt, unsigned int vfid); +static void pf_exit_vf_resume_wip(struct xe_gt *gt, unsigned int vfid); + +static bool pf_enter_vf_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_WIP)) { + struct xe_gt_sriov_control_state *cs = pf_pick_vf_control(gt, vfid); + + reinit_completion(&cs->done); + return true; + } + return false; +} + +static void pf_exit_vf_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_WIP)) { + struct xe_gt_sriov_control_state *cs = pf_pick_vf_control(gt, vfid); + + pf_exit_vf_flr_wip(gt, vfid); + pf_exit_vf_stop_wip(gt, vfid); + pf_exit_vf_pause_wip(gt, vfid); + pf_exit_vf_resume_wip(gt, vfid); + + complete_all(&cs->done); + } +} + +static int pf_wait_vf_wip_done(struct xe_gt *gt, unsigned int vfid, unsigned long timeout) +{ + struct xe_gt_sriov_control_state *cs = pf_pick_vf_control(gt, vfid); + + return wait_for_completion_timeout(&cs->done, timeout) ? 0 : -ETIMEDOUT; +} + +static void pf_enter_vf_ready(struct xe_gt *gt, unsigned int vfid) +{ + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED); + pf_exit_vf_mismatch(gt, vfid); + pf_exit_vf_wip(gt, vfid); +} + +/** + * DOC: The VF PAUSE state machine + * + * The VF PAUSE state machine looks like:: + * + * (READY,RESUMED)<-------------<---------------------o---------o + * | \ \ + * pause \ \ + * | \ \ + * ....V...........................PAUSE_WIP........ \ \ + * : \ : o \ + * : \ o------<-----busy : | \ + * : \ / / : | | + * : PAUSE_SEND_PAUSE ---failed--->----------o--->(PAUSE_FAILED) | + * : | \ : | | + * : acked rejected---->----------o--->(MISMATCH) / + * : | : / + * : v : / + * : PAUSE_WAIT_GUC : / + * : | : / + * : done : / + * : | : / + * : v : / + * : PAUSE_GUC_DONE o-----restart + * : / : + * : / : + * :....o..............o...............o...........: + * | | | + * completed flr stop + * | | | + * V .....V..... ......V..... + * (PAUSED) : FLR_WIP : : STOP_WIP : + * :.........: :..........: + * + * For the full state machine view, see `The VF state machine`_. + */ + +static void pf_exit_vf_pause_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_WIP)) { + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_SEND_PAUSE); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_WAIT_GUC); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_GUC_DONE); + } +} + +static void pf_enter_vf_paused(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED); + pf_exit_vf_mismatch(gt, vfid); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_pause_completed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_paused(gt, vfid); +} + +static void pf_enter_vf_pause_failed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_FAILED); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_pause_rejected(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_mismatch(gt, vfid); + pf_enter_vf_pause_failed(gt, vfid); +} + +static bool pf_exit_vf_pause_guc_done(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_GUC_DONE)) + return false; + + pf_enter_vf_pause_completed(gt, vfid); + return true; +} + +static void pf_enter_vf_pause_guc_done(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_GUC_DONE)) + pf_queue_vf(gt, vfid); +} + +static void pf_enter_pause_wait_guc(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_WAIT_GUC)) + pf_enter_vf_state_machine_bug(gt, vfid); +} + +static bool pf_exit_pause_wait_guc(struct xe_gt *gt, unsigned int vfid) +{ + return pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_WAIT_GUC); +} + +static void pf_enter_vf_pause_send_pause(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_SEND_PAUSE)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_pause_send_pause(struct xe_gt *gt, unsigned int vfid) +{ + int err; + + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_SEND_PAUSE)) + return false; + + /* GuC may actually send a PAUSE_DONE before we get a RESPONSE */ + pf_enter_pause_wait_guc(gt, vfid); + + err = pf_send_vf_pause(gt, vfid); + if (err) { + /* send failed, so we shouldn't expect PAUSE_DONE from GuC */ + pf_exit_pause_wait_guc(gt, vfid); + + if (err == -EBUSY) + pf_enter_vf_pause_send_pause(gt, vfid); + else if (err == -EIO) + pf_enter_vf_pause_rejected(gt, vfid); + else + pf_enter_vf_pause_failed(gt, vfid); + } else { + /* + * we have already moved to WAIT_GUC, maybe even to GUC_DONE + * but since GuC didn't complain, we may clear MISMATCH + */ + pf_exit_vf_mismatch(gt, vfid); + } + + return true; +} + +static bool pf_enter_vf_pause_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_WIP)) { + pf_enter_vf_wip(gt, vfid); + pf_enter_vf_pause_send_pause(gt, vfid); + return true; + } + + return false; +} + +/** + * xe_gt_sriov_pf_control_pause_vf - Pause a VF. + * @gt: the &xe_gt + * @vfid: the VF identifier + * + * This function is for PF only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_control_pause_vf(struct xe_gt *gt, unsigned int vfid) +{ + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_PAUSE_WIP); + int err; + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED)) { + xe_gt_sriov_dbg(gt, "VF%u is stopped!\n", vfid); + return -EPERM; + } + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED)) { + xe_gt_sriov_dbg(gt, "VF%u was already paused!\n", vfid); + return -ESTALE; + } + + if (!pf_enter_vf_pause_wip(gt, vfid)) { + xe_gt_sriov_dbg(gt, "VF%u pause already in progress!\n", vfid); + return -EALREADY; + } + + err = pf_wait_vf_wip_done(gt, vfid, timeout); + if (err) { + xe_gt_sriov_dbg(gt, "VF%u pause didn't finish in %u ms (%pe)\n", + vfid, jiffies_to_msecs(timeout), ERR_PTR(err)); + return err; + } + + if (pf_expect_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED)) { + xe_gt_sriov_info(gt, "VF%u paused!\n", vfid); + return 0; + } + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_FAILED)) { + xe_gt_sriov_dbg(gt, "VF%u pause failed!\n", vfid); + return -EIO; + } + + xe_gt_sriov_dbg(gt, "VF%u pause was canceled!\n", vfid); + return -ECANCELED; +} + +/** + * DOC: The VF RESUME state machine + * + * The VF RESUME state machine looks like:: + * + * (PAUSED)<-----------------<------------------------o + * | \ + * resume \ + * | \ + * ....V............................RESUME_WIP...... \ + * : \ : o + * : \ o-------<-----busy : | + * : \ / / : | + * : RESUME_SEND_RESUME ---failed--->--------o--->(RESUME_FAILED) + * : / \ : | + * : acked rejected---->---------o--->(MISMATCH) + * : / : + * :....o..............o...............o.....o.....: + * | | | \ + * completed flr stop restart-->(READY) + * | | | + * V .....V..... ......V..... + * (RESUMED) : FLR_WIP : : STOP_WIP : + * :.........: :..........: + * + * For the full state machine view, see `The VF state machine`_. + */ + +static void pf_exit_vf_resume_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_WIP)) + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_SEND_RESUME); +} + +static void pf_enter_vf_resumed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED); + pf_exit_vf_mismatch(gt, vfid); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_resume_completed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_resumed(gt, vfid); +} + +static void pf_enter_vf_resume_failed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_FAILED); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_resume_rejected(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_mismatch(gt, vfid); + pf_enter_vf_resume_failed(gt, vfid); +} + +static void pf_enter_vf_resume_send_resume(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_SEND_RESUME)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_resume_send_resume(struct xe_gt *gt, unsigned int vfid) +{ + int err; + + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_SEND_RESUME)) + return false; + + err = pf_send_vf_resume(gt, vfid); + if (err == -EBUSY) + pf_enter_vf_resume_send_resume(gt, vfid); + else if (err == -EIO) + pf_enter_vf_resume_rejected(gt, vfid); + else if (err) + pf_enter_vf_resume_failed(gt, vfid); + else + pf_enter_vf_resume_completed(gt, vfid); + return true; +} + +static bool pf_enter_vf_resume_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_WIP)) { + pf_enter_vf_wip(gt, vfid); + pf_enter_vf_resume_send_resume(gt, vfid); + return true; + } + + return false; +} + +/** + * xe_gt_sriov_pf_control_resume_vf - Resume a VF. + * @gt: the &xe_gt + * @vfid: the VF identifier + * + * This function is for PF only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_control_resume_vf(struct xe_gt *gt, unsigned int vfid) +{ + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_RESUME_WIP); + int err; + + if (!pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED)) { + xe_gt_sriov_dbg(gt, "VF%u is not paused!\n", vfid); + return -EPERM; + } + + if (!pf_enter_vf_resume_wip(gt, vfid)) { + xe_gt_sriov_dbg(gt, "VF%u resume already in progress!\n", vfid); + return -EALREADY; + } + + err = pf_wait_vf_wip_done(gt, vfid, timeout); + if (err) + return err; + + if (pf_expect_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED)) { + xe_gt_sriov_info(gt, "VF%u resumed!\n", vfid); + return 0; + } + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUME_FAILED)) { + xe_gt_sriov_dbg(gt, "VF%u resume failed!\n", vfid); + return -EIO; + } + + xe_gt_sriov_dbg(gt, "VF%u resume was canceled!\n", vfid); + return -ECANCELED; +} + +/** + * DOC: The VF STOP state machine + * + * The VF STOP state machine looks like:: + * + * (READY,PAUSED,RESUMED)<-------<--------------------o + * | \ + * stop \ + * | \ + * ....V..............................STOP_WIP...... \ + * : \ : o + * : \ o----<----busy : | + * : \ / / : | + * : STOP_SEND_STOP--------failed--->--------o--->(STOP_FAILED) + * : / \ : | + * : acked rejected-------->--------o--->(MISMATCH) + * : / : + * :....o..............o...............o...........: + * | | | + * completed flr restart + * | | | + * V .....V..... V + * (STOPPED) : FLR_WIP : (READY) + * :.........: + * + * For the full state machine view, see `The VF state machine`_. + */ + +static void pf_exit_vf_stop_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_WIP)) + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_SEND_STOP); +} + +static void pf_enter_vf_stopped(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_RESUMED); + pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSED); + pf_exit_vf_mismatch(gt, vfid); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_stop_completed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_stopped(gt, vfid); +} + +static void pf_enter_vf_stop_failed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_FAILED); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_stop_rejected(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_mismatch(gt, vfid); + pf_enter_vf_stop_failed(gt, vfid); +} + +static void pf_enter_vf_stop_send_stop(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_SEND_STOP)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_stop_send_stop(struct xe_gt *gt, unsigned int vfid) +{ + int err; + + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_SEND_STOP)) + return false; + + err = pf_send_vf_stop(gt, vfid); + if (err == -EBUSY) + pf_enter_vf_stop_send_stop(gt, vfid); + else if (err == -EIO) + pf_enter_vf_stop_rejected(gt, vfid); + else if (err) + pf_enter_vf_stop_failed(gt, vfid); + else + pf_enter_vf_stop_completed(gt, vfid); + return true; +} + +static bool pf_enter_vf_stop_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_WIP)) { + pf_enter_vf_wip(gt, vfid); + pf_enter_vf_stop_send_stop(gt, vfid); + return true; + } + return false; +} + +/** + * xe_gt_sriov_pf_control_stop_vf - Stop a VF. + * @gt: the &xe_gt + * @vfid: the VF identifier + * + * This function is for PF only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_control_stop_vf(struct xe_gt *gt, unsigned int vfid) +{ + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_STOP_WIP); + int err; + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED)) { + xe_gt_sriov_dbg(gt, "VF%u was already stopped!\n", vfid); + return -ESTALE; + } + + if (!pf_enter_vf_stop_wip(gt, vfid)) { + xe_gt_sriov_dbg(gt, "VF%u stop already in progress!\n", vfid); + return -EALREADY; + } + + err = pf_wait_vf_wip_done(gt, vfid, timeout); + if (err) + return err; + + if (pf_expect_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOPPED)) { + xe_gt_sriov_info(gt, "VF%u stopped!\n", vfid); + return 0; + } + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_STOP_FAILED)) { + xe_gt_sriov_dbg(gt, "VF%u stop failed!\n", vfid); + return -EIO; + } + + xe_gt_sriov_dbg(gt, "VF%u stop was canceled!\n", vfid); + return -ECANCELED; +} + +/** + * DOC: The VF FLR state machine + * + * The VF FLR state machine looks like:: + * + * (READY,PAUSED,STOPPED)<------------<--------------o + * | \ + * flr \ + * | \ + * ....V..........................FLR_WIP........... \ + * : \ : \ + * : \ o----<----busy : | + * : \ / / : | + * : FLR_SEND_START---failed----->-----------o--->(FLR_FAILED)<---o + * : | \ : | | + * : acked rejected----->-----------o--->(MISMATCH) | + * : | : ^ | + * : v : | | + * : FLR_WAIT_GUC : | | + * : | : | | + * : done : | | + * : | : | | + * : v : | | + * : FLR_GUC_DONE : | | + * : | : | | + * : FLR_RESET_CONFIG---failed--->-----------o--------+-----------o + * : | : | | + * : FLR_RESET_DATA : | | + * : | : | | + * : FLR_RESET_MMIO : | | + * : | : | | + * : | o----<----busy : | | + * : |/ / : | | + * : FLR_SEND_FINISH----failed--->-----------o--------+-----------o + * : / \ : | + * : acked rejected----->-----------o--------o + * : / : + * :....o..............................o...........: + * | | + * completed restart + * | / + * V / + * (READY)<----------<------------o + * + * For the full state machine view, see `The VF state machine`_. + */ + +static void pf_enter_vf_flr_send_start(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_SEND_START)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static void pf_enter_vf_flr_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_WIP)) { + xe_gt_sriov_dbg(gt, "VF%u FLR is already in progress\n", vfid); + return; + } + + pf_enter_vf_wip(gt, vfid); + pf_enter_vf_flr_send_start(gt, vfid); +} + +static void pf_exit_vf_flr_wip(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_WIP)) { + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_SEND_FINISH); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_MMIO); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_DATA); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_CONFIG); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_GUC_DONE); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_WAIT_GUC); + pf_escape_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_SEND_START); + } +} + +static void pf_enter_vf_flr_completed(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_ready(gt, vfid); +} + +static void pf_enter_vf_flr_failed(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_FAILED)) + xe_gt_sriov_notice(gt, "VF%u FLR failed!\n", vfid); + pf_exit_vf_wip(gt, vfid); +} + +static void pf_enter_vf_flr_rejected(struct xe_gt *gt, unsigned int vfid) +{ + pf_enter_vf_mismatch(gt, vfid); + pf_enter_vf_flr_failed(gt, vfid); +} + +static void pf_enter_vf_flr_send_finish(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_SEND_FINISH)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_flr_send_finish(struct xe_gt *gt, unsigned int vfid) +{ + int err; + + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_SEND_FINISH)) + return false; + + err = pf_send_vf_flr_finish(gt, vfid); + if (err == -EBUSY) + pf_enter_vf_flr_send_finish(gt, vfid); + else if (err == -EIO) + pf_enter_vf_flr_rejected(gt, vfid); + else if (err) + pf_enter_vf_flr_failed(gt, vfid); + else + pf_enter_vf_flr_completed(gt, vfid); + return true; +} + +static void pf_enter_vf_flr_reset_mmio(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_MMIO)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_flr_reset_mmio(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_MMIO)) + return false; + + /* XXX: placeholder */ + + pf_enter_vf_flr_send_finish(gt, vfid); + return true; +} + +static void pf_enter_vf_flr_reset_data(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_DATA)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_flr_reset_data(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_DATA)) + return false; + + xe_gt_sriov_pf_service_reset(gt, vfid); + xe_gt_sriov_pf_monitor_flr(gt, vfid); + + pf_enter_vf_flr_reset_mmio(gt, vfid); + return true; +} + +static void pf_enter_vf_flr_reset_config(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_CONFIG)) + pf_enter_vf_state_machine_bug(gt, vfid); + + pf_queue_vf(gt, vfid); +} + +static bool pf_exit_vf_flr_reset_config(struct xe_gt *gt, unsigned int vfid) +{ + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_FLR_RESET_CONFIG); + int err; + + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_RESET_CONFIG)) + return false; + + err = xe_gt_sriov_pf_config_sanitize(gt, vfid, timeout); + if (err) + pf_enter_vf_flr_failed(gt, vfid); + else + pf_enter_vf_flr_reset_data(gt, vfid); + return true; +} + +static void pf_enter_vf_flr_wait_guc(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_WAIT_GUC)) + pf_enter_vf_state_machine_bug(gt, vfid); +} + +static bool pf_exit_vf_flr_wait_guc(struct xe_gt *gt, unsigned int vfid) +{ + return pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_WAIT_GUC); +} + +static bool pf_exit_vf_flr_send_start(struct xe_gt *gt, unsigned int vfid) +{ + int err; + + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_SEND_START)) + return false; + + /* GuC may actually send a FLR_DONE before we get a RESPONSE */ + pf_enter_vf_flr_wait_guc(gt, vfid); + + err = pf_send_vf_flr_start(gt, vfid); + if (err) { + /* send failed, so we shouldn't expect FLR_DONE from GuC */ + pf_exit_vf_flr_wait_guc(gt, vfid); + + if (err == -EBUSY) + pf_enter_vf_flr_send_start(gt, vfid); + else if (err == -EIO) + pf_enter_vf_flr_rejected(gt, vfid); + else + pf_enter_vf_flr_failed(gt, vfid); + } else { + /* + * we have already moved to WAIT_GUC, maybe even to GUC_DONE + * but since GuC didn't complain, we may clear MISMATCH + */ + pf_exit_vf_mismatch(gt, vfid); + } + + return true; +} + +static bool pf_exit_vf_flr_guc_done(struct xe_gt *gt, unsigned int vfid) +{ + if (!pf_exit_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_GUC_DONE)) + return false; + + pf_enter_vf_flr_reset_config(gt, vfid); + return true; +} + +static void pf_enter_vf_flr_guc_done(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_enter_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_GUC_DONE)) + pf_queue_vf(gt, vfid); +} + +/** + * xe_gt_sriov_pf_control_trigger_flr - Start a VF FLR sequence. + * @gt: the &xe_gt + * @vfid: the VF identifier + * + * This function is for PF only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_control_trigger_flr(struct xe_gt *gt, unsigned int vfid) +{ + unsigned long timeout = pf_get_default_timeout(XE_GT_SRIOV_STATE_FLR_WIP); + int err; + + pf_enter_vf_flr_wip(gt, vfid); + + err = pf_wait_vf_wip_done(gt, vfid, timeout); + if (err) { + xe_gt_sriov_notice(gt, "VF%u FLR didn't finish in %u ms (%pe)\n", + vfid, jiffies_to_msecs(timeout), ERR_PTR(err)); + return err; + } + + if (!pf_expect_vf_not_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_FAILED)) + return -EIO; + + return 0; +} + +/** + * DOC: The VF FLR Flow with GuC + * + * The VF FLR flow includes several steps:: + * + * PF GUC PCI + * ======================================================== + * | | | + * (1) | [ ] <----- FLR --| + * | [ ] : + * (2) [ ] <-------- NOTIFY FLR --[ ] + * [ ] | + * (3) [ ] | + * [ ] | + * [ ]-- START FLR ---------> [ ] + * | [ ] + * (4) | [ ] + * | [ ] + * [ ] <--------- FLR DONE -- [ ] + * [ ] | + * (5) [ ] | + * [ ] | + * [ ]-- FINISH FLR --------> [ ] + * | | + * + * * Step 1: PCI HW generates interrupt to the GuC about VF FLR + * * Step 2: GuC FW sends G2H notification to the PF about VF FLR + * * Step 2a: on some platforms G2H is only received from root GuC + * * Step 3: PF sends H2G request to the GuC to start VF FLR sequence + * * Step 3a: on some platforms PF must send H2G to all other GuCs + * * Step 4: GuC FW performs VF FLR cleanups and notifies the PF when done + * * Step 5: PF performs VF FLR cleanups and notifies the GuC FW when finished + */ + +static bool needs_dispatch_flr(struct xe_device *xe) +{ + return xe->info.platform == XE_PVC; +} + +static void pf_handle_vf_flr(struct xe_gt *gt, u32 vfid) +{ + struct xe_device *xe = gt_to_xe(gt); + struct xe_gt *gtit; + unsigned int gtid; + + xe_gt_sriov_info(gt, "VF%u FLR\n", vfid); + + if (needs_dispatch_flr(xe)) { + for_each_gt(gtit, xe, gtid) + pf_enter_vf_flr_wip(gtit, vfid); + } else { + pf_enter_vf_flr_wip(gt, vfid); + } +} + +static void pf_handle_vf_flr_done(struct xe_gt *gt, u32 vfid) +{ + if (!pf_exit_vf_flr_wait_guc(gt, vfid)) { + xe_gt_sriov_dbg(gt, "Received out of order 'VF%u FLR done'\n", vfid); + pf_enter_vf_mismatch(gt, vfid); + return; + } + + pf_enter_vf_flr_guc_done(gt, vfid); +} + +static void pf_handle_vf_pause_done(struct xe_gt *gt, u32 vfid) +{ + if (!pf_exit_pause_wait_guc(gt, vfid)) { + xe_gt_sriov_dbg(gt, "Received out of order 'VF%u PAUSE done'\n", vfid); + pf_enter_vf_mismatch(gt, vfid); + return; + } + + pf_enter_vf_pause_guc_done(gt, vfid); +} + +static int pf_handle_vf_event(struct xe_gt *gt, u32 vfid, u32 eventid) +{ + xe_gt_sriov_dbg_verbose(gt, "received VF%u event %#x\n", vfid, eventid); + + if (vfid > xe_gt_sriov_pf_get_totalvfs(gt)) + return -EPROTO; + + switch (eventid) { + case GUC_PF_NOTIFY_VF_FLR: + pf_handle_vf_flr(gt, vfid); + break; + case GUC_PF_NOTIFY_VF_FLR_DONE: + pf_handle_vf_flr_done(gt, vfid); + break; + case GUC_PF_NOTIFY_VF_PAUSE_DONE: + pf_handle_vf_pause_done(gt, vfid); + break; + case GUC_PF_NOTIFY_VF_FIXUP_DONE: + break; + default: + return -ENOPKG; + } + return 0; +} + +static int pf_handle_pf_event(struct xe_gt *gt, u32 eventid) +{ + switch (eventid) { + case GUC_PF_NOTIFY_VF_ENABLE: + xe_gt_sriov_dbg_verbose(gt, "VFs %s/%s\n", + str_enabled_disabled(true), + str_enabled_disabled(false)); + break; + default: + return -ENOPKG; + } + return 0; +} + +/** + * xe_gt_sriov_pf_control_process_guc2pf - Handle VF state notification from GuC. + * @gt: the &xe_gt + * @msg: the G2H message + * @len: the length of the G2H message + * + * This function is for PF only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_control_process_guc2pf(struct xe_gt *gt, const u32 *msg, u32 len) +{ + u32 vfid; + u32 eventid; + + xe_gt_assert(gt, len); + xe_gt_assert(gt, FIELD_GET(GUC_HXG_MSG_0_ORIGIN, msg[0]) == GUC_HXG_ORIGIN_GUC); + xe_gt_assert(gt, FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[0]) == GUC_HXG_TYPE_EVENT); + xe_gt_assert(gt, FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[0]) == + GUC_ACTION_GUC2PF_VF_STATE_NOTIFY); + + if (unlikely(!xe_device_is_sriov_pf(gt_to_xe(gt)))) + return -EPROTO; + + if (unlikely(FIELD_GET(GUC2PF_VF_STATE_NOTIFY_EVENT_MSG_0_MBZ, msg[0]))) + return -EPFNOSUPPORT; + + if (unlikely(len != GUC2PF_VF_STATE_NOTIFY_EVENT_MSG_LEN)) + return -EPROTO; + + vfid = FIELD_GET(GUC2PF_VF_STATE_NOTIFY_EVENT_MSG_1_VFID, msg[1]); + eventid = FIELD_GET(GUC2PF_VF_STATE_NOTIFY_EVENT_MSG_2_EVENT, msg[2]); + + return vfid ? pf_handle_vf_event(gt, vfid, eventid) : pf_handle_pf_event(gt, eventid); +} + +static bool pf_process_vf_state_machine(struct xe_gt *gt, unsigned int vfid) +{ + if (pf_exit_vf_flr_send_start(gt, vfid)) + return true; + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_FLR_WAIT_GUC)) { + xe_gt_sriov_dbg_verbose(gt, "VF%u in %s\n", vfid, + control_bit_to_string(XE_GT_SRIOV_STATE_FLR_WAIT_GUC)); + return false; + } + + if (pf_exit_vf_flr_guc_done(gt, vfid)) + return true; + + if (pf_exit_vf_flr_reset_config(gt, vfid)) + return true; + + if (pf_exit_vf_flr_reset_data(gt, vfid)) + return true; + + if (pf_exit_vf_flr_reset_mmio(gt, vfid)) + return true; + + if (pf_exit_vf_flr_send_finish(gt, vfid)) + return true; + + if (pf_exit_vf_stop_send_stop(gt, vfid)) + return true; + + if (pf_exit_vf_pause_send_pause(gt, vfid)) + return true; + + if (pf_check_vf_state(gt, vfid, XE_GT_SRIOV_STATE_PAUSE_WAIT_GUC)) { + xe_gt_sriov_dbg_verbose(gt, "VF%u in %s\n", vfid, + control_bit_to_string(XE_GT_SRIOV_STATE_PAUSE_WAIT_GUC)); + return true; + } + + if (pf_exit_vf_pause_guc_done(gt, vfid)) + return true; + + if (pf_exit_vf_resume_send_resume(gt, vfid)) + return true; + + return false; +} + +static unsigned int pf_control_state_index(struct xe_gt *gt, + struct xe_gt_sriov_control_state *cs) +{ + return container_of(cs, struct xe_gt_sriov_metadata, control) - gt->sriov.pf.vfs; +} + +static void pf_worker_find_work(struct xe_gt *gt) +{ + struct xe_gt_sriov_pf_control *pfc = >->sriov.pf.control; + struct xe_gt_sriov_control_state *cs; + unsigned int vfid; + bool empty; + bool more; + + spin_lock(&pfc->lock); + cs = list_first_entry_or_null(&pfc->list, struct xe_gt_sriov_control_state, link); + if (cs) + list_del_init(&cs->link); + empty = list_empty(&pfc->list); + spin_unlock(&pfc->lock); + + if (!cs) + return; + + /* VF metadata structures are indexed by the VFID */ + vfid = pf_control_state_index(gt, cs); + xe_gt_assert(gt, vfid <= xe_gt_sriov_pf_get_totalvfs(gt)); + + more = pf_process_vf_state_machine(gt, vfid); + if (more) + pf_queue_vf(gt, vfid); + else if (!empty) + pf_queue_control_worker(gt); +} + +static void control_worker_func(struct work_struct *w) +{ + struct xe_gt *gt = container_of(w, struct xe_gt, sriov.pf.control.worker); + + xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt))); + pf_worker_find_work(gt); +} + +static void pf_stop_worker(struct xe_gt *gt) +{ + xe_gt_assert(gt, IS_SRIOV_PF(gt_to_xe(gt))); + cancel_work_sync(>->sriov.pf.control.worker); +} + +static void control_fini_action(struct drm_device *dev, void *data) +{ + struct xe_gt *gt = data; + + pf_stop_worker(gt); +} + +/** + * xe_gt_sriov_pf_control_init() - Initialize PF's control data. + * @gt: the &xe_gt + * + * This function is for PF only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_control_init(struct xe_gt *gt) +{ + struct xe_device *xe = gt_to_xe(gt); + unsigned int n, totalvfs; + + xe_gt_assert(gt, IS_SRIOV_PF(xe)); + + totalvfs = xe_sriov_pf_get_totalvfs(xe); + for (n = 0; n <= totalvfs; n++) { + struct xe_gt_sriov_control_state *cs = pf_pick_vf_control(gt, n); + + init_completion(&cs->done); + INIT_LIST_HEAD(&cs->link); + } + + spin_lock_init(>->sriov.pf.control.lock); + INIT_LIST_HEAD(>->sriov.pf.control.list); + INIT_WORK(>->sriov.pf.control.worker, control_worker_func); + + return drmm_add_action_or_reset(&xe->drm, control_fini_action, gt); +} + +/** + * xe_gt_sriov_pf_control_restart() - Restart SR-IOV control data after a GT reset. + * @gt: the &xe_gt + * + * Any per-VF status maintained by the PF or any ongoing VF control activity + * performed by the PF must be reset or cancelled when the GT is reset. + * + * This function is for PF only. + */ +void xe_gt_sriov_pf_control_restart(struct xe_gt *gt) +{ + struct xe_device *xe = gt_to_xe(gt); + unsigned int n, totalvfs; + + xe_gt_assert(gt, IS_SRIOV_PF(xe)); + + pf_stop_worker(gt); + + totalvfs = xe_sriov_pf_get_totalvfs(xe); + for (n = 1; n <= totalvfs; n++) + pf_enter_vf_ready(gt, n); +} |