// 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);
}
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