[PATCH 02/19] drm/dp: Add support for DP tunneling
Imre Deak
imre.deak at intel.com
Wed Jan 31 13:58:42 UTC 2024
On Wed, Jan 31, 2024 at 02:50:16PM +0200, Hogander, Jouni wrote:
> [...]
> > +
> > +struct drm_dp_tunnel_group;
> > +
> > +struct drm_dp_tunnel {
> > + struct drm_dp_tunnel_group *group;
> > +
> > + struct list_head node;
> > +
> > + struct kref kref;
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > + struct ref_tracker *tracker;
> > +#endif
> > + struct drm_dp_aux *aux;
> > + char name[8];
> > +
> > + int bw_granularity;
> > + int estimated_bw;
> > + int allocated_bw;
> > +
> > + int max_dprx_rate;
> > + u8 max_dprx_lane_count;
> > +
> > + u8 adapter_id;
> > +
> > + bool bw_alloc_supported:1;
> > + bool bw_alloc_enabled:1;
> > + bool has_io_error:1;
> > + bool destroyed:1;
> > +};
> > +
> > +struct drm_dp_tunnel_group_state;
> > +
> > +struct drm_dp_tunnel_state {
> > + struct drm_dp_tunnel_group_state *group_state;
> > +
> > + struct drm_dp_tunnel_ref tunnel_ref;
> > +
> > + struct list_head node;
> > +
> > + u32 stream_mask;
>
> I'm wondering if drm_dp_tunnel_state can really contain several streams
> and what kind of scenario this would be? From i915 point of view I
> would understand that several pipes are routed to DP tunnel.
Yes, multiple pipes through the same tunnel and the use case for that is
MST with multiple streams. The "stream" term is only an abstraction
where it could be a different physical thing in various drivers, but for
i915 it just means pipes. Not 100% sure if that's the best mapping,
since in case of bigjoiner there would be multiple pipes, but possibly
(in the SST case) only one stream from the tunneling POV.
> Is it bigjoiner case?
IIUC in that (SST) case the streams would be joined already before going
to the TBT DP_IN adapter, so that's only one stream in stream_mask above
(unless MST + bigjoiner, where you could have 2 MST/DP tunnel streams
each consisting of 2 pipes).
> BR,
>
> Jouni Högander
>
> > + int *stream_bw;
> > +};
> > +
> > +struct drm_dp_tunnel_group_state {
> > + struct drm_private_state base;
> > +
> > + struct list_head tunnel_states;
> > +};
> > +
> > +struct drm_dp_tunnel_group {
> > + struct drm_private_obj base;
> > + struct drm_dp_tunnel_mgr *mgr;
> > +
> > + struct list_head tunnels;
> > +
> > + int available_bw; /* available BW including the
> > allocated_bw of all tunnels */
> > + int drv_group_id;
> > +
> > + char name[8];
> > +
> > + bool active:1;
> > +};
> > +
> > +struct drm_dp_tunnel_mgr {
> > + struct drm_device *dev;
> > +
> > + int group_count;
> > + struct drm_dp_tunnel_group *groups;
> > + wait_queue_head_t bw_req_queue;
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > + struct ref_tracker_dir ref_tracker;
> > +#endif
> > +};
> > +
> > +static int next_reg_area(int *offset)
> > +{
> > + *offset = find_next_bit(dptun_info_regs, 64, *offset);
> > +
> > + return find_next_zero_bit(dptun_info_regs, 64, *offset + 1) -
> > *offset;
> > +}
> > +
> > +#define tunnel_reg_ptr(__regs, __address) ({ \
> > + WARN_ON(!test_bit((__address) - DP_TUNNELING_BASE,
> > dptun_info_regs)); \
> > + &(__regs)->buf[bitmap_weight(dptun_info_regs, (__address) -
> > DP_TUNNELING_BASE)]; \
> > +})
> > +
> > +static int read_tunnel_regs(struct drm_dp_aux *aux, struct
> > drm_dp_tunnel_regs *regs)
> > +{
> > + int offset = 0;
> > + int len;
> > +
> > + while ((len = next_reg_area(&offset))) {
> > + int address = DP_TUNNELING_BASE + offset;
> > +
> > + if (drm_dp_dpcd_read(aux, address,
> > tunnel_reg_ptr(regs, address), len) < 0)
> > + return -EIO;
> > +
> > + offset += len;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static u8 tunnel_reg(const struct drm_dp_tunnel_regs *regs, int
> > address)
> > +{
> > + return *tunnel_reg_ptr(regs, address);
> > +}
> > +
> > +static int tunnel_reg_drv_group_id(const struct drm_dp_tunnel_regs
> > *regs)
> > +{
> > + int drv_id = tunnel_reg(regs, DP_USB4_DRIVER_ID) &
> > DP_USB4_DRIVER_ID_MASK;
> > + int group_id = tunnel_reg(regs,
> > DP_IN_ADAPTER_TUNNEL_INFORMATION) & DP_GROUP_ID_MASK;
> > +
> > + if (!group_id)
> > + return 0;
> > +
> > + return (drv_id << DP_GROUP_ID_BITS) | group_id;
> > +}
> > +
> > +/* Return granularity in kB/s units */
> > +static int tunnel_reg_bw_granularity(const struct drm_dp_tunnel_regs
> > *regs)
> > +{
> > + int gr = tunnel_reg(regs, DP_BW_GRANULARITY) &
> > DP_BW_GRANULARITY_MASK;
> > +
> > + WARN_ON(gr > 2);
> > +
> > + return (250000 << gr) / 8;
> > +}
> > +
> > +static int tunnel_reg_max_dprx_rate(const struct drm_dp_tunnel_regs
> > *regs)
> > +{
> > + u8 bw_code = tunnel_reg(regs, DP_TUNNELING_MAX_LINK_RATE);
> > +
> > + return drm_dp_bw_code_to_link_rate(bw_code);
> > +}
> > +
> > +static int tunnel_reg_max_dprx_lane_count(const struct
> > drm_dp_tunnel_regs *regs)
> > +{
> > + u8 lane_count = tunnel_reg(regs, DP_TUNNELING_MAX_LANE_COUNT)
> > &
> > + DP_TUNNELING_MAX_LANE_COUNT_MASK;
> > +
> > + return lane_count;
> > +}
> > +
> > +static bool tunnel_reg_bw_alloc_supported(const struct
> > drm_dp_tunnel_regs *regs)
> > +{
> > + u8 cap_mask = DP_TUNNELING_SUPPORT |
> > DP_IN_BW_ALLOCATION_MODE_SUPPORT;
> > +
> > + if ((tunnel_reg(regs, DP_TUNNELING_CAPABILITIES) & cap_mask)
> > != cap_mask)
> > + return false;
> > +
> > + return tunnel_reg(regs, DP_USB4_DRIVER_BW_CAPABILITY) &
> > + DP_USB4_DRIVER_BW_ALLOCATION_MODE_SUPPORT;
> > +}
> > +
> > +static bool tunnel_reg_bw_alloc_enabled(const struct
> > drm_dp_tunnel_regs *regs)
> > +{
> > + return tunnel_reg(regs, DP_DPTX_BW_ALLOCATION_MODE_CONTROL) &
> > + DP_DISPLAY_DRIVER_BW_ALLOCATION_MODE_ENABLE;
> > +}
> > +
> > +static int tunnel_group_drv_id(int drv_group_id)
> > +{
> > + return drv_group_id >> DP_GROUP_ID_BITS;
> > +}
> > +
> > +static int tunnel_group_id(int drv_group_id)
> > +{
> > + return drv_group_id & DP_GROUP_ID_MASK;
> > +}
> > +
> > +const char *drm_dp_tunnel_name(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return tunnel->name;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_name);
> > +
> > +static const char *drm_dp_tunnel_group_name(const struct
> > drm_dp_tunnel_group *group)
> > +{
> > + return group->name;
> > +}
> > +
> > +static struct drm_dp_tunnel_group *
> > +lookup_or_alloc_group(struct drm_dp_tunnel_mgr *mgr, int
> > drv_group_id)
> > +{
> > + struct drm_dp_tunnel_group *group = NULL;
> > + int i;
> > +
> > + for (i = 0; i < mgr->group_count; i++) {
> > + /*
> > + * A tunnel group with 0 group ID shouldn't have more
> > than one
> > + * tunnels.
> > + */
> > + if (tunnel_group_id(drv_group_id) &&
> > + mgr->groups[i].drv_group_id == drv_group_id)
> > + return &mgr->groups[i];
> > +
> > + if (!group && !mgr->groups[i].active)
> > + group = &mgr->groups[i];
> > + }
> > +
> > + if (!group) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: Can't allocate more tunnel
> > groups\n");
> > + return NULL;
> > + }
> > +
> > + group->drv_group_id = drv_group_id;
> > + group->active = true;
> > +
> > + snprintf(group->name, sizeof(group->name), "%d:%d:*",
> > + tunnel_group_drv_id(drv_group_id) & ((1 <<
> > DP_GROUP_ID_BITS) - 1),
> > + tunnel_group_id(drv_group_id) & ((1 <<
> > DP_USB4_DRIVER_ID_BITS) - 1));
> > +
> > + return group;
> > +}
> > +
> > +static void free_group(struct drm_dp_tunnel_group *group)
> > +{
> > + struct drm_dp_tunnel_mgr *mgr = group->mgr;
> > +
> > + if (drm_WARN_ON(mgr->dev, !list_empty(&group->tunnels)))
> > + return;
> > +
> > + group->drv_group_id = 0;
> > + group->available_bw = -1;
> > + group->active = false;
> > +}
> > +
> > +static struct drm_dp_tunnel *
> > +tunnel_get(struct drm_dp_tunnel *tunnel)
> > +{
> > + kref_get(&tunnel->kref);
> > +
> > + return tunnel;
> > +}
> > +
> > +static void free_tunnel(struct kref *kref)
> > +{
> > + struct drm_dp_tunnel *tunnel = container_of(kref,
> > typeof(*tunnel), kref);
> > + struct drm_dp_tunnel_group *group = tunnel->group;
> > +
> > + list_del(&tunnel->node);
> > + if (list_empty(&group->tunnels))
> > + free_group(group);
> > +
> > + kfree(tunnel);
> > +}
> > +
> > +static void tunnel_put(struct drm_dp_tunnel *tunnel)
> > +{
> > + kref_put(&tunnel->kref, free_tunnel);
> > +}
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > +static void track_tunnel_ref(struct drm_dp_tunnel *tunnel,
> > + struct ref_tracker **tracker)
> > +{
> > + ref_tracker_alloc(&tunnel->group->mgr->ref_tracker,
> > + tracker, GFP_KERNEL);
> > +}
> > +
> > +static void untrack_tunnel_ref(struct drm_dp_tunnel *tunnel,
> > + struct ref_tracker **tracker)
> > +{
> > + ref_tracker_free(&tunnel->group->mgr->ref_tracker,
> > + tracker);
> > +}
> > +
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_get_untracked(struct drm_dp_tunnel *tunnel)
> > +{
> > + track_tunnel_ref(tunnel, NULL);
> > +
> > + return tunnel_get(tunnel);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_get_untracked);
> > +
> > +void drm_dp_tunnel_put_untracked(struct drm_dp_tunnel *tunnel)
> > +{
> > + tunnel_put(tunnel);
> > + untrack_tunnel_ref(tunnel, NULL);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_put_untracked);
> > +
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_get(struct drm_dp_tunnel *tunnel,
> > + struct ref_tracker **tracker)
> > +{
> > + track_tunnel_ref(tunnel, tracker);
> > +
> > + return tunnel_get(tunnel);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_get);
> > +
> > +void drm_dp_tunnel_put(struct drm_dp_tunnel *tunnel,
> > + struct ref_tracker **tracker)
> > +{
> > + untrack_tunnel_ref(tunnel, tracker);
> > + tunnel_put(tunnel);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_put);
> > +#else
> > +#define track_tunnel_ref(tunnel, tracker) do {} while (0)
> > +#define untrack_tunnel_ref(tunnel, tracker) do {} while (0)
> > +
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_get_untracked(struct drm_dp_tunnel *tunnel)
> > +{
> > + return tunnel_get(tunnel);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_get_untracked);
> > +
> > +void drm_dp_tunnel_put_untracked(struct drm_dp_tunnel *tunnel)
> > +{
> > + tunnel_put(tunnel);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_put_untracked);
> > +#endif
> > +
> > +static bool add_tunnel_to_group(struct drm_dp_tunnel_mgr *mgr,
> > + int drv_group_id,
> > + struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_group *group =
> > + lookup_or_alloc_group(mgr, drv_group_id);
> > +
> > + if (!group)
> > + return false;
> > +
> > + tunnel->group = group;
> > + list_add(&tunnel->node, &group->tunnels);
> > +
> > + return true;
> > +}
> > +
> > +static struct drm_dp_tunnel *
> > +create_tunnel(struct drm_dp_tunnel_mgr *mgr,
> > + struct drm_dp_aux *aux,
> > + const struct drm_dp_tunnel_regs *regs)
> > +{
> > + int drv_group_id = tunnel_reg_drv_group_id(regs);
> > + struct drm_dp_tunnel *tunnel;
> > +
> > + tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);
> > + if (!tunnel)
> > + return NULL;
> > +
> > + INIT_LIST_HEAD(&tunnel->node);
> > +
> > + kref_init(&tunnel->kref);
> > +
> > + tunnel->aux = aux;
> > +
> > + tunnel->adapter_id = tunnel_reg(regs, DP_IN_ADAPTER_INFO) &
> > DP_IN_ADAPTER_NUMBER_MASK;
> > +
> > + snprintf(tunnel->name, sizeof(tunnel->name), "%d:%d:%d",
> > + tunnel_group_drv_id(drv_group_id) & ((1 <<
> > DP_GROUP_ID_BITS) - 1),
> > + tunnel_group_id(drv_group_id) & ((1 <<
> > DP_USB4_DRIVER_ID_BITS) - 1),
> > + tunnel->adapter_id & ((1 <<
> > DP_IN_ADAPTER_NUMBER_BITS) - 1));
> > +
> > + tunnel->bw_granularity = tunnel_reg_bw_granularity(regs);
> > + tunnel->allocated_bw = tunnel_reg(regs, DP_ALLOCATED_BW) *
> > + tunnel->bw_granularity;
> > +
> > + tunnel->bw_alloc_supported =
> > tunnel_reg_bw_alloc_supported(regs);
> > + tunnel->bw_alloc_enabled = tunnel_reg_bw_alloc_enabled(regs);
> > +
> > + if (!add_tunnel_to_group(mgr, drv_group_id, tunnel)) {
> > + kfree(tunnel);
> > +
> > + return NULL;
> > + }
> > +
> > + track_tunnel_ref(tunnel, &tunnel->tracker);
> > +
> > + return tunnel;
> > +}
> > +
> > +static void destroy_tunnel(struct drm_dp_tunnel *tunnel)
> > +{
> > + untrack_tunnel_ref(tunnel, &tunnel->tracker);
> > + tunnel_put(tunnel);
> > +}
> > +
> > +void drm_dp_tunnel_set_io_error(struct drm_dp_tunnel *tunnel)
> > +{
> > + tunnel->has_io_error = true;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_set_io_error);
> > +
> > +static char yes_no_chr(int val)
> > +{
> > + return val ? 'Y' : 'N';
> > +}
> > +
> > +#define SKIP_DPRX_CAPS_CHECK BIT(0)
> > +#define ALLOW_ALLOCATED_BW_CHANGE BIT(1)
> > +
> > +static bool tunnel_regs_are_valid(struct drm_dp_tunnel_mgr *mgr,
> > + const struct drm_dp_tunnel_regs
> > *regs,
> > + unsigned int flags)
> > +{
> > + int drv_group_id = tunnel_reg_drv_group_id(regs);
> > + bool check_dprx = !(flags & SKIP_DPRX_CAPS_CHECK);
> > + bool ret = true;
> > +
> > + if (!tunnel_reg_bw_alloc_supported(regs)) {
> > + if (tunnel_group_id(drv_group_id)) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: A non-zero group ID is
> > only allowed with BWA support\n");
> > + ret = false;
> > + }
> > +
> > + if (tunnel_reg(regs, DP_ALLOCATED_BW)) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: BW is allocated without
> > BWA support\n");
> > + ret = false;
> > + }
> > +
> > + return ret;
> > + }
> > +
> > + if (!tunnel_group_id(drv_group_id)) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: BWA support requires a non-zero
> > group ID\n");
> > + ret = false;
> > + }
> > +
> > + if (check_dprx &&
> > hweight8(tunnel_reg_max_dprx_lane_count(regs)) != 1) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: Invalid DPRX lane count: %d\n",
> > + tunnel_reg_max_dprx_lane_count(regs));
> > +
> > + ret = false;
> > + }
> > +
> > + if (check_dprx && !tunnel_reg_max_dprx_rate(regs)) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: DPRX rate is 0\n");
> > +
> > + ret = false;
> > + }
> > +
> > + if (tunnel_reg(regs, DP_ALLOCATED_BW) > tunnel_reg(regs,
> > DP_ESTIMATED_BW)) {
> > + drm_dbg_kms(mgr->dev,
> > + "DPTUN: Allocated BW %d > estimated BW %d
> > Mb/s\n",
> > + DPTUN_BW_ARG(tunnel_reg(regs,
> > DP_ALLOCATED_BW) *
> > +
> > tunnel_reg_bw_granularity(regs)),
> > + DPTUN_BW_ARG(tunnel_reg(regs,
> > DP_ESTIMATED_BW) *
> > +
> > tunnel_reg_bw_granularity(regs)));
> > +
> > + ret = false;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static bool tunnel_info_changes_are_valid(struct drm_dp_tunnel
> > *tunnel,
> > + const struct
> > drm_dp_tunnel_regs *regs,
> > + unsigned int flags)
> > +{
> > + int new_drv_group_id = tunnel_reg_drv_group_id(regs);
> > + bool ret = true;
> > +
> > + if (tunnel->bw_alloc_supported !=
> > tunnel_reg_bw_alloc_supported(regs)) {
> > + tun_dbg(tunnel,
> > + "BW alloc support has changed %c -> %c\n",
> > + yes_no_chr(tunnel->bw_alloc_supported),
> > + yes_no_chr(tunnel_reg_bw_alloc_supported(regs
> > )));
> > +
> > + ret = false;
> > + }
> > +
> > + if (tunnel->group->drv_group_id != new_drv_group_id) {
> > + tun_dbg(tunnel,
> > + "Driver/group ID has changed %d:%d:* ->
> > %d:%d:*\n",
> > + tunnel_group_drv_id(tunnel->group-
> > >drv_group_id),
> > + tunnel_group_id(tunnel->group->drv_group_id),
> > + tunnel_group_drv_id(new_drv_group_id),
> > + tunnel_group_id(new_drv_group_id));
> > +
> > + ret = false;
> > + }
> > +
> > + if (!tunnel->bw_alloc_supported)
> > + return ret;
> > +
> > + if (tunnel->bw_granularity !=
> > tunnel_reg_bw_granularity(regs)) {
> > + tun_dbg(tunnel,
> > + "BW granularity has changed: %d -> %d
> > Mb/s\n",
> > + DPTUN_BW_ARG(tunnel->bw_granularity),
> > + DPTUN_BW_ARG(tunnel_reg_bw_granularity(regs))
> > );
> > +
> > + ret = false;
> > + }
> > +
> > + /*
> > + * On some devices at least the BW alloc mode enabled status
> > is always
> > + * reported as 0, so skip checking that here.
> > + */
> > +
> > + if (!(flags & ALLOW_ALLOCATED_BW_CHANGE) &&
> > + tunnel->allocated_bw !=
> > + tunnel_reg(regs, DP_ALLOCATED_BW) * tunnel-
> > >bw_granularity) {
> > + tun_dbg(tunnel,
> > + "Allocated BW has changed: %d -> %d Mb/s\n",
> > + DPTUN_BW_ARG(tunnel->allocated_bw),
> > + DPTUN_BW_ARG(tunnel_reg(regs,
> > DP_ALLOCATED_BW) * tunnel->bw_granularity));
> > +
> > + ret = false;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +static int
> > +read_and_verify_tunnel_regs(struct drm_dp_tunnel *tunnel,
> > + struct drm_dp_tunnel_regs *regs,
> > + unsigned int flags)
> > +{
> > + int err;
> > +
> > + err = read_tunnel_regs(tunnel->aux, regs);
> > + if (err < 0) {
> > + drm_dp_tunnel_set_io_error(tunnel);
> > +
> > + return err;
> > + }
> > +
> > + if (!tunnel_regs_are_valid(tunnel->group->mgr, regs, flags))
> > + return -EINVAL;
> > +
> > + if (!tunnel_info_changes_are_valid(tunnel, regs, flags))
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +static bool update_dprx_caps(struct drm_dp_tunnel *tunnel, const
> > struct drm_dp_tunnel_regs *regs)
> > +{
> > + bool changed = false;
> > +
> > + if (tunnel_reg_max_dprx_rate(regs) != tunnel->max_dprx_rate)
> > {
> > + tunnel->max_dprx_rate =
> > tunnel_reg_max_dprx_rate(regs);
> > + changed = true;
> > + }
> > +
> > + if (tunnel_reg_max_dprx_lane_count(regs) != tunnel-
> > >max_dprx_lane_count) {
> > + tunnel->max_dprx_lane_count =
> > tunnel_reg_max_dprx_lane_count(regs);
> > + changed = true;
> > + }
> > +
> > + return changed;
> > +}
> > +
> > +static int dev_id_len(const u8 *dev_id, int max_len)
> > +{
> > + while (max_len && dev_id[max_len - 1] == '\0')
> > + max_len--;
> > +
> > + return max_len;
> > +}
> > +
> > +static int get_max_dprx_bw(const struct drm_dp_tunnel *tunnel)
> > +{
> > + int bw = drm_dp_max_dprx_data_rate(tunnel->max_dprx_rate,
> > + tunnel-
> > >max_dprx_lane_count);
> > +
> > + return min(roundup(bw, tunnel->bw_granularity),
> > + MAX_DP_REQUEST_BW * tunnel->bw_granularity);
> > +}
> > +
> > +static int get_max_tunnel_bw(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return min(get_max_dprx_bw(tunnel), tunnel->group-
> > >available_bw);
> > +}
> > +
> > +/**
> > + * drm_dp_tunnel_detect - Detect DP tunnel on the link
> > + * @mgr: Tunnel manager
> > + * @aux: DP AUX on which the tunnel will be detected
> > + *
> > + * Detect if there is any DP tunnel on the link and add it to the
> > tunnel
> > + * group's tunnel list.
> > + *
> > + * Returns 0 on success, negative error code on failure.
> > + */
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_detect(struct drm_dp_tunnel_mgr *mgr,
> > + struct drm_dp_aux *aux)
> > +{
> > + struct drm_dp_tunnel_regs regs;
> > + struct drm_dp_tunnel *tunnel;
> > + int err;
> > +
> > + err = read_tunnel_regs(aux, ®s);
> > + if (err)
> > + return ERR_PTR(err);
> > +
> > + if (!(tunnel_reg(®s, DP_TUNNELING_CAPABILITIES) &
> > + DP_TUNNELING_SUPPORT))
> > + return ERR_PTR(-ENODEV);
> > +
> > + /* The DPRX caps are valid only after enabling BW alloc mode.
> > */
> > + if (!tunnel_regs_are_valid(mgr, ®s, SKIP_DPRX_CAPS_CHECK))
> > + return ERR_PTR(-EINVAL);
> > +
> > + tunnel = create_tunnel(mgr, aux, ®s);
> > + if (!tunnel)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + tun_dbg(tunnel,
> > + "OUI:%*phD DevID:%*pE Rev-HW:%d.%d SW:%d.%d PR-Sup:%c
> > BWA-Sup:%c BWA-En:%c\n",
> > + DP_TUNNELING_OUI_BYTES,
> > + tunnel_reg_ptr(®s, DP_TUNNELING_OUI),
> > + dev_id_len(tunnel_reg_ptr(®s,
> > DP_TUNNELING_DEV_ID), DP_TUNNELING_DEV_ID_BYTES),
> > + tunnel_reg_ptr(®s, DP_TUNNELING_DEV_ID),
> > + (tunnel_reg(®s, DP_TUNNELING_HW_REV) &
> > DP_TUNNELING_HW_REV_MAJOR_MASK) >>
> > + DP_TUNNELING_HW_REV_MAJOR_SHIFT,
> > + (tunnel_reg(®s, DP_TUNNELING_HW_REV) &
> > DP_TUNNELING_HW_REV_MINOR_MASK) >>
> > + DP_TUNNELING_HW_REV_MINOR_SHIFT,
> > + tunnel_reg(®s, DP_TUNNELING_SW_REV_MAJOR),
> > + tunnel_reg(®s, DP_TUNNELING_SW_REV_MINOR),
> > + yes_no_chr(tunnel_reg(®s,
> > DP_TUNNELING_CAPABILITIES) &
> > + DP_PANEL_REPLAY_OPTIMIZATION_SUPPORT),
> > + yes_no_chr(tunnel->bw_alloc_supported),
> > + yes_no_chr(tunnel->bw_alloc_enabled));
> > +
> > + return tunnel;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_detect);
> > +
> > +/**
> > + * drm_dp_tunnel_destroy - Destroy tunnel object
> > + * @tunnel: Tunnel object
> > + *
> > + * Remove the tunnel from the tunnel topology and destroy it.
> > + */
> > +int drm_dp_tunnel_destroy(struct drm_dp_tunnel *tunnel)
> > +{
> > + if (drm_WARN_ON(tunnel->group->mgr->dev, tunnel->destroyed))
> > + return -ENODEV;
> > +
> > + tun_dbg(tunnel, "destroying\n");
> > +
> > + tunnel->destroyed = true;
> > + destroy_tunnel(tunnel);
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_destroy);
> > +
> > +static int check_tunnel(const struct drm_dp_tunnel *tunnel)
> > +{
> > + if (tunnel->destroyed)
> > + return -ENODEV;
> > +
> > + if (tunnel->has_io_error)
> > + return -EIO;
> > +
> > + return 0;
> > +}
> > +
> > +static int group_allocated_bw(struct drm_dp_tunnel_group *group)
> > +{
> > + struct drm_dp_tunnel *tunnel;
> > + int group_allocated_bw = 0;
> > +
> > + for_each_tunnel_in_group(group, tunnel) {
> > + if (check_tunnel(tunnel) == 0 &&
> > + tunnel->bw_alloc_enabled)
> > + group_allocated_bw += tunnel->allocated_bw;
> > + }
> > +
> > + return group_allocated_bw;
> > +}
> > +
> > +static int calc_group_available_bw(const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return group_allocated_bw(tunnel->group) -
> > + tunnel->allocated_bw +
> > + tunnel->estimated_bw;
> > +}
> > +
> > +static int update_group_available_bw(struct drm_dp_tunnel *tunnel,
> > + const struct drm_dp_tunnel_regs
> > *regs)
> > +{
> > + struct drm_dp_tunnel *tunnel_iter;
> > + int group_available_bw;
> > + bool changed;
> > +
> > + tunnel->estimated_bw = tunnel_reg(regs, DP_ESTIMATED_BW) *
> > tunnel->bw_granularity;
> > +
> > + if (calc_group_available_bw(tunnel) == tunnel->group-
> > >available_bw)
> > + return 0;
> > +
> > + for_each_tunnel_in_group(tunnel->group, tunnel_iter) {
> > + int err;
> > +
> > + if (tunnel_iter == tunnel)
> > + continue;
> > +
> > + if (check_tunnel(tunnel_iter) != 0 ||
> > + !tunnel_iter->bw_alloc_enabled)
> > + continue;
> > +
> > + err = drm_dp_dpcd_probe(tunnel_iter->aux,
> > DP_DPCD_REV);
> > + if (err) {
> > + tun_dbg(tunnel_iter,
> > + "Probe failed, assume disconnected
> > (err %pe)\n",
> > + ERR_PTR(err));
> > + drm_dp_tunnel_set_io_error(tunnel_iter);
> > + }
> > + }
> > +
> > + group_available_bw = calc_group_available_bw(tunnel);
> > +
> > + tun_dbg(tunnel, "Updated group available BW: %d->%d\n",
> > + DPTUN_BW_ARG(tunnel->group->available_bw),
> > + DPTUN_BW_ARG(group_available_bw));
> > +
> > + changed = tunnel->group->available_bw != group_available_bw;
> > +
> > + tunnel->group->available_bw = group_available_bw;
> > +
> > + return changed ? 1 : 0;
> > +}
> > +
> > +static int set_bw_alloc_mode(struct drm_dp_tunnel *tunnel, bool
> > enable)
> > +{
> > + u8 mask = DP_DISPLAY_DRIVER_BW_ALLOCATION_MODE_ENABLE |
> > DP_UNMASK_BW_ALLOCATION_IRQ;
> > + u8 val;
> > +
> > + if (drm_dp_dpcd_readb(tunnel->aux,
> > DP_DPTX_BW_ALLOCATION_MODE_CONTROL, &val) < 0)
> > + goto out_err;
> > +
> > + if (enable)
> > + val |= mask;
> > + else
> > + val &= ~mask;
> > +
> > + if (drm_dp_dpcd_writeb(tunnel->aux,
> > DP_DPTX_BW_ALLOCATION_MODE_CONTROL, val) < 0)
> > + goto out_err;
> > +
> > + tunnel->bw_alloc_enabled = enable;
> > +
> > + return 0;
> > +
> > +out_err:
> > + drm_dp_tunnel_set_io_error(tunnel);
> > +
> > + return -EIO;
> > +}
> > +
> > +/**
> > + * drm_dp_tunnel_enable_bw_alloc: Enable DP tunnel BW allocation
> > mode
> > + * @tunnel: Tunnel object
> > + *
> > + * Enable the DP tunnel BW allocation mode on @tunnel if it supports
> > it.
> > + *
> > + * Returns 0 in case of success, negative error code otherwise.
> > + */
> > +int drm_dp_tunnel_enable_bw_alloc(struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_regs regs;
> > + int err = check_tunnel(tunnel);
> > +
> > + if (err)
> > + return err;
> > +
> > + if (!tunnel->bw_alloc_supported)
> > + return -EOPNOTSUPP;
> > +
> > + if (!tunnel_group_id(tunnel->group->drv_group_id))
> > + return -EINVAL;
> > +
> > + err = set_bw_alloc_mode(tunnel, true);
> > + if (err)
> > + goto out;
> > +
> > + err = read_and_verify_tunnel_regs(tunnel, ®s, 0);
> > + if (err) {
> > + set_bw_alloc_mode(tunnel, false);
> > +
> > + goto out;
> > + }
> > +
> > + if (!tunnel->max_dprx_rate)
> > + update_dprx_caps(tunnel, ®s);
> > +
> > + if (tunnel->group->available_bw == -1) {
> > + err = update_group_available_bw(tunnel, ®s);
> > + if (err > 0)
> > + err = 0;
> > + }
> > +out:
> > + tun_dbg_stat(tunnel, err,
> > + "Enabling BW alloc mode: DPRX:%dx%d Group
> > alloc:%d/%d Mb/s",
> > + tunnel->max_dprx_rate / 100, tunnel-
> > >max_dprx_lane_count,
> > + DPTUN_BW_ARG(group_allocated_bw(tunnel->group)),
> > + DPTUN_BW_ARG(tunnel->group->available_bw));
> > +
> > + return err;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_enable_bw_alloc);
> > +
> > +/**
> > + * drm_dp_tunnel_disable_bw_alloc: Disable DP tunnel BW allocation
> > mode
> > + * @tunnel: Tunnel object
> > + *
> > + * Disable the DP tunnel BW allocation mode on @tunnel.
> > + *
> > + * Returns 0 in case of success, negative error code otherwise.
> > + */
> > +int drm_dp_tunnel_disable_bw_alloc(struct drm_dp_tunnel *tunnel)
> > +{
> > + int err = check_tunnel(tunnel);
> > +
> > + if (err)
> > + return err;
> > +
> > + err = set_bw_alloc_mode(tunnel, false);
> > +
> > + tun_dbg_stat(tunnel, err, "Disabling BW alloc mode");
> > +
> > + return err;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_disable_bw_alloc);
> > +
> > +bool drm_dp_tunnel_bw_alloc_is_enabled(const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return tunnel->bw_alloc_enabled;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_bw_alloc_is_enabled);
> > +
> > +static int bw_req_complete(struct drm_dp_aux *aux, bool
> > *status_changed)
> > +{
> > + u8 bw_req_mask = DP_BW_REQUEST_SUCCEEDED |
> > DP_BW_REQUEST_FAILED;
> > + u8 status_change_mask = DP_BW_ALLOCATION_CAPABILITY_CHANGED |
> > DP_ESTIMATED_BW_CHANGED;
> > + u8 val;
> > +
> > + if (drm_dp_dpcd_readb(aux, DP_TUNNELING_STATUS, &val) < 0)
> > + return -EIO;
> > +
> > + *status_changed = val & status_change_mask;
> > +
> > + val &= bw_req_mask;
> > +
> > + if (!val)
> > + return -EAGAIN;
> > +
> > + if (drm_dp_dpcd_writeb(aux, DP_TUNNELING_STATUS, val) < 0)
> > + return -EIO;
> > +
> > + return val == DP_BW_REQUEST_SUCCEEDED ? 0 : -ENOSPC;
> > +}
> > +
> > +static int allocate_tunnel_bw(struct drm_dp_tunnel *tunnel, int bw)
> > +{
> > + struct drm_dp_tunnel_mgr *mgr = tunnel->group->mgr;
> > + int request_bw = DIV_ROUND_UP(bw, tunnel->bw_granularity);
> > + unsigned long wait_expires;
> > + DEFINE_WAIT(wait);
> > + int err;
> > +
> > + /* Atomic check should prevent the following. */
> > + if (drm_WARN_ON(mgr->dev, request_bw > MAX_DP_REQUEST_BW)) {
> > + err = -EINVAL;
> > + goto out;
> > + }
> > +
> > + if (drm_dp_dpcd_writeb(tunnel->aux, DP_REQUEST_BW,
> > request_bw) < 0) {
> > + err = -EIO;
> > + goto out;
> > + }
> > +
> > + wait_expires = jiffies + msecs_to_jiffies(3000);
> > +
> > + for (;;) {
> > + bool status_changed;
> > +
> > + err = bw_req_complete(tunnel->aux, &status_changed);
> > + if (err != -EAGAIN)
> > + break;
> > +
> > + if (status_changed) {
> > + struct drm_dp_tunnel_regs regs;
> > +
> > + err = read_and_verify_tunnel_regs(tunnel,
> > ®s,
> > +
> > ALLOW_ALLOCATED_BW_CHANGE);
> > + if (err)
> > + break;
> > + }
> > +
> > + if (time_after(jiffies, wait_expires)) {
> > + err = -ETIMEDOUT;
> > + break;
> > + }
> > +
> > + prepare_to_wait(&mgr->bw_req_queue, &wait,
> > TASK_UNINTERRUPTIBLE);
> > + schedule_timeout(msecs_to_jiffies(200));
> > + };
> > +
> > + finish_wait(&mgr->bw_req_queue, &wait);
> > +
> > + if (err)
> > + goto out;
> > +
> > + tunnel->allocated_bw = request_bw * tunnel->bw_granularity;
> > +
> > +out:
> > + tun_dbg_stat(tunnel, err, "Allocating %d/%d Mb/s for tunnel:
> > Group alloc:%d/%d Mb/s",
> > + DPTUN_BW_ARG(request_bw * tunnel-
> > >bw_granularity),
> > + DPTUN_BW_ARG(get_max_tunnel_bw(tunnel)),
> > + DPTUN_BW_ARG(group_allocated_bw(tunnel->group)),
> > + DPTUN_BW_ARG(tunnel->group->available_bw));
> > +
> > + if (err == -EIO)
> > + drm_dp_tunnel_set_io_error(tunnel);
> > +
> > + return err;
> > +}
> > +
> > +int drm_dp_tunnel_alloc_bw(struct drm_dp_tunnel *tunnel, int bw)
> > +{
> > + int err = check_tunnel(tunnel);
> > +
> > + if (err)
> > + return err;
> > +
> > + return allocate_tunnel_bw(tunnel, bw);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_alloc_bw);
> > +
> > +static int check_and_clear_status_change(struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + u8 mask = DP_BW_ALLOCATION_CAPABILITY_CHANGED |
> > DP_ESTIMATED_BW_CHANGED;
> > + u8 val;
> > +
> > + if (drm_dp_dpcd_readb(tunnel->aux, DP_TUNNELING_STATUS, &val)
> > < 0)
> > + goto out_err;
> > +
> > + val &= mask;
> > +
> > + if (val) {
> > + if (drm_dp_dpcd_writeb(tunnel->aux,
> > DP_TUNNELING_STATUS, val) < 0)
> > + goto out_err;
> > +
> > + return 1;
> > + }
> > +
> > + if (!drm_dp_tunnel_bw_alloc_is_enabled(tunnel))
> > + return 0;
> > +
> > + /*
> > + * Check for estimated BW changes explicitly to account for
> > lost
> > + * BW change notifications.
> > + */
> > + if (drm_dp_dpcd_readb(tunnel->aux, DP_ESTIMATED_BW, &val) <
> > 0)
> > + goto out_err;
> > +
> > + if (val * tunnel->bw_granularity != tunnel->estimated_bw)
> > + return 1;
> > +
> > + return 0;
> > +
> > +out_err:
> > + drm_dp_tunnel_set_io_error(tunnel);
> > +
> > + return -EIO;
> > +}
> > +
> > +/**
> > + * drm_dp_tunnel_update_state: Update DP tunnel SW state with the HW
> > state
> > + * @tunnel: Tunnel object
> > + *
> > + * Update the SW state of @tunnel with the HW state.
> > + *
> > + * Returns 0 if the state has not changed, 1 if it has changed and
> > got updated
> > + * successfully and a negative error code otherwise.
> > + */
> > +int drm_dp_tunnel_update_state(struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_regs regs;
> > + bool changed = false;
> > + int ret = check_tunnel(tunnel);
> > +
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = check_and_clear_status_change(tunnel);
> > + if (ret < 0)
> > + goto out;
> > +
> > + if (!ret)
> > + return 0;
> > +
> > + ret = read_and_verify_tunnel_regs(tunnel, ®s, 0);
> > + if (ret)
> > + goto out;
> > +
> > + if (update_dprx_caps(tunnel, ®s))
> > + changed = true;
> > +
> > + ret = update_group_available_bw(tunnel, ®s);
> > + if (ret == 1)
> > + changed = true;
> > +
> > +out:
> > + tun_dbg_stat(tunnel, ret < 0 ? ret : 0,
> > + "State update: Changed:%c DPRX:%dx%d Tunnel
> > alloc:%d/%d Group alloc:%d/%d Mb/s",
> > + yes_no_chr(changed),
> > + tunnel->max_dprx_rate / 100, tunnel-
> > >max_dprx_lane_count,
> > + DPTUN_BW_ARG(tunnel->allocated_bw),
> > + DPTUN_BW_ARG(get_max_tunnel_bw(tunnel)),
> > + DPTUN_BW_ARG(group_allocated_bw(tunnel->group)),
> > + DPTUN_BW_ARG(tunnel->group->available_bw));
> > +
> > + if (ret < 0)
> > + return ret;
> > +
> > + if (changed)
> > + return 1;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_update_state);
> > +
> > +/*
> > + * Returns 0 if no re-probe is needed, 1 if a re-probe is needed,
> > + * a negative error code otherwise.
> > + */
> > +int drm_dp_tunnel_handle_irq(struct drm_dp_tunnel_mgr *mgr, struct
> > drm_dp_aux *aux)
> > +{
> > + u8 val;
> > +
> > + if (drm_dp_dpcd_readb(aux, DP_TUNNELING_STATUS, &val) < 0)
> > + return -EIO;
> > +
> > + if (val & (DP_BW_REQUEST_SUCCEEDED | DP_BW_REQUEST_FAILED))
> > + wake_up_all(&mgr->bw_req_queue);
> > +
> > + if (val & (DP_BW_ALLOCATION_CAPABILITY_CHANGED |
> > DP_ESTIMATED_BW_CHANGED))
> > + return 1;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_handle_irq);
> > +
> > +/**
> > + * drm_dp_tunnel_max_dprx_rate - Query the maximum rate of the
> > tunnel's DPRX
> > + * @tunnel: Tunnel object
> > + *
> > + * The function is used to query the maximum link rate of the DPRX
> > connected
> > + * to @tunnel. Note that this rate will not be limited by the BW
> > limit of the
> > + * tunnel, as opposed to the standard and extended DP_MAX_LINK_RATE
> > DPCD
> > + * registers.
> > + *
> > + * Returns the maximum link rate in 10 kbit/s units.
> > + */
> > +int drm_dp_tunnel_max_dprx_rate(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return tunnel->max_dprx_rate;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_max_dprx_rate);
> > +
> > +/**
> > + * drm_dp_tunnel_max_dprx_lane_count - Query the maximum lane count
> > of the tunnel's DPRX
> > + * @tunnel: Tunnel object
> > + *
> > + * The function is used to query the maximum lane count of the DPRX
> > connected
> > + * to @tunnel. Note that this lane count will not be limited by the
> > BW limit of
> > + * the tunnel, as opposed to the standard and extended
> > DP_MAX_LANE_COUNT DPCD
> > + * registers.
> > + *
> > + * Returns the maximum lane count.
> > + */
> > +int drm_dp_tunnel_max_dprx_lane_count(const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return tunnel->max_dprx_lane_count;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_max_dprx_lane_count);
> > +
> > +/**
> > + * drm_dp_tunnel_available_bw - Query the estimated total available
> > BW of the tunnel
> > + * @tunnel: Tunnel object
> > + *
> > + * This function is used to query the estimated total available BW
> > of the
> > + * tunnel. This includes the currently allocated and free BW for all
> > the
> > + * tunnels in @tunnel's group. The available BW is valid only after
> > the BW
> > + * allocation mode has been enabled for the tunnel and its state got
> > updated
> > + * calling drm_dp_tunnel_update_state().
> > + *
> > + * Returns the @tunnel group's estimated total available bandwidth
> > in kB/s
> > + * units, or -1 if the available BW isn't valid (the BW allocation
> > mode is
> > + * not enabled or the tunnel's state hasn't been updated).
> > + */
> > +int drm_dp_tunnel_available_bw(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return tunnel->group->available_bw;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_available_bw);
> > +
> > +static struct drm_dp_tunnel_group_state *
> > +drm_dp_tunnel_atomic_get_group_state(struct drm_atomic_state *state,
> > + const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return (struct drm_dp_tunnel_group_state *)
> > + drm_atomic_get_private_obj_state(state,
> > + &tunnel->group-
> > >base);
> > +}
> > +
> > +static struct drm_dp_tunnel_state *
> > +add_tunnel_state(struct drm_dp_tunnel_group_state *group_state,
> > + struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_state *tunnel_state;
> > +
> > + tun_dbg_atomic(tunnel,
> > + "Adding state for tunnel %p to group state
> > %p\n",
> > + tunnel, group_state);
> > +
> > + tunnel_state = kzalloc(sizeof(*tunnel_state), GFP_KERNEL);
> > + if (!tunnel_state)
> > + return NULL;
> > +
> > + tunnel_state->group_state = group_state;
> > +
> > + drm_dp_tunnel_ref_get(tunnel, &tunnel_state->tunnel_ref);
> > +
> > + INIT_LIST_HEAD(&tunnel_state->node);
> > + list_add(&tunnel_state->node, &group_state->tunnel_states);
> > +
> > + return tunnel_state;
> > +}
> > +
> > +void drm_dp_tunnel_atomic_clear_state(struct drm_dp_tunnel_state
> > *tunnel_state)
> > +{
> > + tun_dbg_atomic(tunnel_state->tunnel_ref.tunnel,
> > + "Clearing state for tunnel %p\n",
> > + tunnel_state->tunnel_ref.tunnel);
> > +
> > + list_del(&tunnel_state->node);
> > +
> > + kfree(tunnel_state->stream_bw);
> > + drm_dp_tunnel_ref_put(&tunnel_state->tunnel_ref);
> > +
> > + kfree(tunnel_state);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_clear_state);
> > +
> > +static void clear_tunnel_group_state(struct
> > drm_dp_tunnel_group_state *group_state)
> > +{
> > + struct drm_dp_tunnel_state *tunnel_state;
> > + struct drm_dp_tunnel_state *tunnel_state_tmp;
> > +
> > + for_each_tunnel_state_safe(group_state, tunnel_state,
> > tunnel_state_tmp)
> > + drm_dp_tunnel_atomic_clear_state(tunnel_state);
> > +}
> > +
> > +static struct drm_dp_tunnel_state *
> > +get_tunnel_state(struct drm_dp_tunnel_group_state *group_state,
> > + const struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_state *tunnel_state;
> > +
> > + for_each_tunnel_state(group_state, tunnel_state)
> > + if (tunnel_state->tunnel_ref.tunnel == tunnel)
> > + return tunnel_state;
> > +
> > + return NULL;
> > +}
> > +
> > +static struct drm_dp_tunnel_state *
> > +get_or_add_tunnel_state(struct drm_dp_tunnel_group_state
> > *group_state,
> > + struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_state *tunnel_state;
> > +
> > + tunnel_state = get_tunnel_state(group_state, tunnel);
> > + if (tunnel_state)
> > + return tunnel_state;
> > +
> > + return add_tunnel_state(group_state, tunnel);
> > +}
> > +
> > +static struct drm_private_state *
> > +tunnel_group_duplicate_state(struct drm_private_obj *obj)
> > +{
> > + struct drm_dp_tunnel_group_state *group_state =
> > to_group_state(obj->state);
> > + struct drm_dp_tunnel_state *tunnel_state;
> > +
> > + group_state = kzalloc(sizeof(*group_state), GFP_KERNEL);
> > + if (!group_state)
> > + return NULL;
> > +
> > + INIT_LIST_HEAD(&group_state->tunnel_states);
> > +
> > + __drm_atomic_helper_private_obj_duplicate_state(obj,
> > &group_state->base);
> > +
> > + for_each_tunnel_state(to_group_state(obj->state),
> > tunnel_state) {
> > + struct drm_dp_tunnel_state *new_tunnel_state;
> > +
> > + new_tunnel_state =
> > get_or_add_tunnel_state(group_state,
> > +
> > tunnel_state->tunnel_ref.tunnel);
> > + if (!new_tunnel_state)
> > + goto out_free_state;
> > +
> > + new_tunnel_state->stream_mask = tunnel_state-
> > >stream_mask;
> > + new_tunnel_state->stream_bw = kmemdup(tunnel_state-
> > >stream_bw,
> > +
> > sizeof(*tunnel_state->stream_bw) *
> > + hweight32(tun
> > nel_state->stream_mask),
> > + GFP_KERNEL);
> > +
> > + if (!new_tunnel_state->stream_bw)
> > + goto out_free_state;
> > + }
> > +
> > + return &group_state->base;
> > +
> > +out_free_state:
> > + clear_tunnel_group_state(group_state);
> > + kfree(group_state);
> > +
> > + return NULL;
> > +}
> > +
> > +static void tunnel_group_destroy_state(struct drm_private_obj *obj,
> > struct drm_private_state *state)
> > +{
> > + struct drm_dp_tunnel_group_state *group_state =
> > to_group_state(state);
> > +
> > + clear_tunnel_group_state(group_state);
> > + kfree(group_state);
> > +}
> > +
> > +static const struct drm_private_state_funcs tunnel_group_funcs = {
> > + .atomic_duplicate_state = tunnel_group_duplicate_state,
> > + .atomic_destroy_state = tunnel_group_destroy_state,
> > +};
> > +
> > +struct drm_dp_tunnel_state *
> > +drm_dp_tunnel_atomic_get_state(struct drm_atomic_state *state,
> > + struct drm_dp_tunnel *tunnel)
> > +{
> > + struct drm_dp_tunnel_group_state *group_state =
> > + drm_dp_tunnel_atomic_get_group_state(state, tunnel);
> > + struct drm_dp_tunnel_state *tunnel_state;
> > +
> > + if (IS_ERR(group_state))
> > + return ERR_CAST(group_state);
> > +
> > + tunnel_state = get_or_add_tunnel_state(group_state, tunnel);
> > + if (!tunnel_state)
> > + return ERR_PTR(-ENOMEM);
> > +
> > + return tunnel_state;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_get_state);
> > +
> > +struct drm_dp_tunnel_state *
> > +drm_dp_tunnel_atomic_get_new_state(struct drm_atomic_state *state,
> > + const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + struct drm_dp_tunnel_group_state *new_group_state;
> > + int i;
> > +
> > + for_each_new_group_in_state(state, new_group_state, i)
> > + if (to_group(new_group_state->base.obj) == tunnel-
> > >group)
> > + return get_tunnel_state(new_group_state,
> > tunnel);
> > +
> > + return NULL;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_get_new_state);
> > +
> > +static bool init_group(struct drm_dp_tunnel_mgr *mgr, struct
> > drm_dp_tunnel_group *group)
> > +{
> > + struct drm_dp_tunnel_group_state *group_state =
> > kzalloc(sizeof(*group_state), GFP_KERNEL);
> > +
> > + if (!group_state)
> > + return false;
> > +
> > + INIT_LIST_HEAD(&group_state->tunnel_states);
> > +
> > + group->mgr = mgr;
> > + group->available_bw = -1;
> > + INIT_LIST_HEAD(&group->tunnels);
> > +
> > + drm_atomic_private_obj_init(mgr->dev, &group->base,
> > &group_state->base,
> > + &tunnel_group_funcs);
> > +
> > + return true;
> > +}
> > +
> > +static void cleanup_group(struct drm_dp_tunnel_group *group)
> > +{
> > + drm_atomic_private_obj_fini(&group->base);
> > +}
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > +static void check_unique_stream_ids(const struct
> > drm_dp_tunnel_group_state *group_state)
> > +{
> > + const struct drm_dp_tunnel_state *tunnel_state;
> > + u32 stream_mask = 0;
> > +
> > + for_each_tunnel_state(group_state, tunnel_state) {
> > + drm_WARN(to_group(group_state->base.obj)->mgr->dev,
> > + tunnel_state->stream_mask & stream_mask,
> > + "[DPTUN %s]: conflicting stream IDs %x (IDs
> > in other tunnels %x)\n",
> > + tunnel_state->tunnel_ref.tunnel->name,
> > + tunnel_state->stream_mask,
> > + stream_mask);
> > +
> > + stream_mask |= tunnel_state->stream_mask;
> > + }
> > +}
> > +#else
> > +static void check_unique_stream_ids(const struct
> > drm_dp_tunnel_group_state *group_state)
> > +{
> > +}
> > +#endif
> > +
> > +static int stream_id_to_idx(u32 stream_mask, u8 stream_id)
> > +{
> > + return hweight32(stream_mask & (BIT(stream_id) - 1));
> > +}
> > +
> > +static int resize_bw_array(struct drm_dp_tunnel_state *tunnel_state,
> > + unsigned long old_mask, unsigned long
> > new_mask)
> > +{
> > + unsigned long move_mask = old_mask & new_mask;
> > + int *new_bws = NULL;
> > + int id;
> > +
> > + WARN_ON(!new_mask);
> > +
> > + if (old_mask == new_mask)
> > + return 0;
> > +
> > + new_bws = kcalloc(hweight32(new_mask), sizeof(*new_bws),
> > GFP_KERNEL);
> > + if (!new_bws)
> > + return -ENOMEM;
> > +
> > + for_each_set_bit(id, &move_mask, BITS_PER_TYPE(move_mask))
> > + new_bws[stream_id_to_idx(new_mask, id)] =
> > + tunnel_state-
> > >stream_bw[stream_id_to_idx(old_mask, id)];
> > +
> > + kfree(tunnel_state->stream_bw);
> > + tunnel_state->stream_bw = new_bws;
> > + tunnel_state->stream_mask = new_mask;
> > +
> > + return 0;
> > +}
> > +
> > +static int set_stream_bw(struct drm_dp_tunnel_state *tunnel_state,
> > + u8 stream_id, int bw)
> > +{
> > + int err;
> > +
> > + err = resize_bw_array(tunnel_state,
> > + tunnel_state->stream_mask,
> > + tunnel_state->stream_mask |
> > BIT(stream_id));
> > + if (err)
> > + return err;
> > +
> > + tunnel_state->stream_bw[stream_id_to_idx(tunnel_state-
> > >stream_mask, stream_id)] = bw;
> > +
> > + return 0;
> > +}
> > +
> > +static int clear_stream_bw(struct drm_dp_tunnel_state *tunnel_state,
> > + u8 stream_id)
> > +{
> > + if (!(tunnel_state->stream_mask & ~BIT(stream_id))) {
> > + drm_dp_tunnel_atomic_clear_state(tunnel_state);
> > + return 0;
> > + }
> > +
> > + return resize_bw_array(tunnel_state,
> > + tunnel_state->stream_mask,
> > + tunnel_state->stream_mask &
> > ~BIT(stream_id));
> > +}
> > +
> > +int drm_dp_tunnel_atomic_set_stream_bw(struct drm_atomic_state
> > *state,
> > + struct drm_dp_tunnel
> > *tunnel,
> > + u8 stream_id, int bw)
> > +{
> > + struct drm_dp_tunnel_group_state *new_group_state =
> > + drm_dp_tunnel_atomic_get_group_state(state, tunnel);
> > + struct drm_dp_tunnel_state *tunnel_state;
> > + int err;
> > +
> > + if (drm_WARN_ON(tunnel->group->mgr->dev,
> > + stream_id > BITS_PER_TYPE(tunnel_state-
> > >stream_mask)))
> > + return -EINVAL;
> > +
> > + tun_dbg(tunnel,
> > + "Setting %d Mb/s for stream %d\n",
> > + DPTUN_BW_ARG(bw), stream_id);
> > +
> > + if (bw == 0) {
> > + tunnel_state = get_tunnel_state(new_group_state,
> > tunnel);
> > + if (!tunnel_state)
> > + return 0;
> > +
> > + return clear_stream_bw(tunnel_state, stream_id);
> > + }
> > +
> > + tunnel_state = get_or_add_tunnel_state(new_group_state,
> > tunnel);
> > + if (drm_WARN_ON(state->dev, !tunnel_state))
> > + return -EINVAL;
> > +
> > + err = set_stream_bw(tunnel_state, stream_id, bw);
> > + if (err)
> > + return err;
> > +
> > + check_unique_stream_ids(new_group_state);
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_set_stream_bw);
> > +
> > +int drm_dp_tunnel_atomic_get_tunnel_bw(const struct
> > drm_dp_tunnel_state *tunnel_state)
> > +{
> > + int tunnel_bw = 0;
> > + int i;
> > +
> > + for (i = 0; i < hweight32(tunnel_state->stream_mask); i++)
> > + tunnel_bw += tunnel_state->stream_bw[i];
> > +
> > + return tunnel_bw;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_get_tunnel_bw);
> > +
> > +int drm_dp_tunnel_atomic_get_group_streams_in_state(struct
> > drm_atomic_state *state,
> > + const struct
> > drm_dp_tunnel *tunnel,
> > + u32 *stream_mask)
> > +{
> > + struct drm_dp_tunnel_group_state *group_state =
> > + drm_dp_tunnel_atomic_get_group_state(state, tunnel);
> > + struct drm_dp_tunnel_state *tunnel_state;
> > +
> > + if (IS_ERR(group_state))
> > + return PTR_ERR(group_state);
> > +
> > + *stream_mask = 0;
> > + for_each_tunnel_state(group_state, tunnel_state)
> > + *stream_mask |= tunnel_state->stream_mask;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_get_group_streams_in_state);
> > +
> > +static int
> > +drm_dp_tunnel_atomic_check_group_bw(struct drm_dp_tunnel_group_state
> > *new_group_state,
> > + u32 *failed_stream_mask)
> > +{
> > + struct drm_dp_tunnel_group *group = to_group(new_group_state-
> > >base.obj);
> > + struct drm_dp_tunnel_state *new_tunnel_state;
> > + u32 group_stream_mask = 0;
> > + int group_bw = 0;
> > +
> > + for_each_tunnel_state(new_group_state, new_tunnel_state) {
> > + struct drm_dp_tunnel *tunnel = new_tunnel_state-
> > >tunnel_ref.tunnel;
> > + int max_dprx_bw = get_max_dprx_bw(tunnel);
> > + int tunnel_bw =
> > drm_dp_tunnel_atomic_get_tunnel_bw(new_tunnel_state);
> > +
> > + tun_dbg(tunnel,
> > + "%sRequired %d/%d Mb/s total for tunnel.\n",
> > + tunnel_bw > max_dprx_bw ? "Not enough BW: " :
> > "",
> > + DPTUN_BW_ARG(tunnel_bw),
> > + DPTUN_BW_ARG(max_dprx_bw));
> > +
> > + if (tunnel_bw > max_dprx_bw) {
> > + *failed_stream_mask = new_tunnel_state-
> > >stream_mask;
> > + return -ENOSPC;
> > + }
> > +
> > + group_bw += min(roundup(tunnel_bw, tunnel-
> > >bw_granularity),
> > + max_dprx_bw);
> > + group_stream_mask |= new_tunnel_state->stream_mask;
> > + }
> > +
> > + tun_grp_dbg(group,
> > + "%sRequired %d/%d Mb/s total for tunnel
> > group.\n",
> > + group_bw > group->available_bw ? "Not enough BW:
> > " : "",
> > + DPTUN_BW_ARG(group_bw),
> > + DPTUN_BW_ARG(group->available_bw));
> > +
> > + if (group_bw > group->available_bw) {
> > + *failed_stream_mask = group_stream_mask;
> > + return -ENOSPC;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +int drm_dp_tunnel_atomic_check_stream_bws(struct drm_atomic_state
> > *state,
> > + u32 *failed_stream_mask)
> > +{
> > + struct drm_dp_tunnel_group_state *new_group_state;
> > + int i;
> > +
> > + for_each_new_group_in_state(state, new_group_state, i) {
> > + int ret;
> > +
> > + ret =
> > drm_dp_tunnel_atomic_check_group_bw(new_group_state,
> > +
> > failed_stream_mask);
> > + if (ret)
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_atomic_check_stream_bws);
> > +
> > +static void destroy_mgr(struct drm_dp_tunnel_mgr *mgr)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < mgr->group_count; i++) {
> > + cleanup_group(&mgr->groups[i]);
> > + drm_WARN_ON(mgr->dev, !list_empty(&mgr-
> > >groups[i].tunnels));
> > + }
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > + ref_tracker_dir_exit(&mgr->ref_tracker);
> > +#endif
> > +
> > + kfree(mgr->groups);
> > + kfree(mgr);
> > +}
> > +
> > +/**
> > + * drm_dp_tunnel_mgr_create - Create a DP tunnel manager
> > + * @i915: i915 driver object
> > + *
> > + * Creates a DP tunnel manager.
> > + *
> > + * Returns a pointer to the tunnel manager if created successfully
> > or NULL in
> > + * case of an error.
> > + */
> > +struct drm_dp_tunnel_mgr *
> > +drm_dp_tunnel_mgr_create(struct drm_device *dev, int
> > max_group_count)
> > +{
> > + struct drm_dp_tunnel_mgr *mgr = kzalloc(sizeof(*mgr),
> > GFP_KERNEL);
> > + int i;
> > +
> > + if (!mgr)
> > + return NULL;
> > +
> > + mgr->dev = dev;
> > + init_waitqueue_head(&mgr->bw_req_queue);
> > +
> > + mgr->groups = kcalloc(max_group_count, sizeof(*mgr->groups),
> > GFP_KERNEL);
> > + if (!mgr->groups) {
> > + kfree(mgr);
> > +
> > + return NULL;
> > + }
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > + ref_tracker_dir_init(&mgr->ref_tracker, 16, "dptun");
> > +#endif
> > +
> > + for (i = 0; i < max_group_count; i++) {
> > + if (!init_group(mgr, &mgr->groups[i])) {
> > + destroy_mgr(mgr);
> > +
> > + return NULL;
> > + }
> > +
> > + mgr->group_count++;
> > + }
> > +
> > + return mgr;
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_mgr_create);
> > +
> > +/**
> > + * drm_dp_tunnel_mgr_destroy - Destroy DP tunnel manager
> > + * @mgr: Tunnel manager object
> > + *
> > + * Destroy the tunnel manager.
> > + */
> > +void drm_dp_tunnel_mgr_destroy(struct drm_dp_tunnel_mgr *mgr)
> > +{
> > + destroy_mgr(mgr);
> > +}
> > +EXPORT_SYMBOL(drm_dp_tunnel_mgr_destroy);
> > diff --git a/include/drm/display/drm_dp.h
> > b/include/drm/display/drm_dp.h
> > index 281afff6ee4e5..8bfd5d007be8d 100644
> > --- a/include/drm/display/drm_dp.h
> > +++ b/include/drm/display/drm_dp.h
> > @@ -1382,6 +1382,66 @@
> > #define DP_HDCP_2_2_REG_STREAM_TYPE_OFFSET 0x69494
> > #define DP_HDCP_2_2_REG_DBG_OFFSET 0x69518
> >
> > +/* DP-tunneling */
> > +#define DP_TUNNELING_OUI 0xe0000
> > +#define DP_TUNNELING_OUI_BYTES 3
> > +
> > +#define DP_TUNNELING_DEV_ID 0xe0003
> > +#define DP_TUNNELING_DEV_ID_BYTES 6
> > +
> > +#define DP_TUNNELING_HW_REV 0xe0009
> > +#define DP_TUNNELING_HW_REV_MAJOR_SHIFT 4
> > +#define DP_TUNNELING_HW_REV_MAJOR_MASK (0xf
> > << DP_TUNNELING_HW_REV_MAJOR_SHIFT)
> > +#define DP_TUNNELING_HW_REV_MINOR_SHIFT 0
> > +#define DP_TUNNELING_HW_REV_MINOR_MASK (0xf
> > << DP_TUNNELING_HW_REV_MINOR_SHIFT)
> > +
> > +#define DP_TUNNELING_SW_REV_MAJOR 0xe000a
> > +#define DP_TUNNELING_SW_REV_MINOR 0xe000b
> > +
> > +#define DP_TUNNELING_CAPABILITIES 0xe000d
> > +#define DP_IN_BW_ALLOCATION_MODE_SUPPORT (1 << 7)
> > +#define DP_PANEL_REPLAY_OPTIMIZATION_SUPPORT (1 << 6)
> > +#define DP_TUNNELING_SUPPORT (1 << 0)
> > +
> > +#define DP_IN_ADAPTER_INFO 0xe000e
> > +#define DP_IN_ADAPTER_NUMBER_BITS 7
> > +#define DP_IN_ADAPTER_NUMBER_MASK ((1 <<
> > DP_IN_ADAPTER_NUMBER_BITS) - 1)
> > +
> > +#define DP_USB4_DRIVER_ID 0xe000f
> > +#define DP_USB4_DRIVER_ID_BITS 4
> > +#define DP_USB4_DRIVER_ID_MASK ((1
> > << DP_USB4_DRIVER_ID_BITS) - 1)
> > +
> > +#define DP_USB4_DRIVER_BW_CAPABILITY 0xe0020
> > +#define DP_USB4_DRIVER_BW_ALLOCATION_MODE_SUPPORT (1 << 7)
> > +
> > +#define DP_IN_ADAPTER_TUNNEL_INFORMATION 0xe0021
> > +#define DP_GROUP_ID_BITS 3
> > +#define DP_GROUP_ID_MASK ((1 <<
> > DP_GROUP_ID_BITS) - 1)
> > +
> > +#define DP_BW_GRANULARITY 0xe0022
> > +#define DP_BW_GRANULARITY_MASK 0x3
> > +
> > +#define
> > DP_ESTIMATED_BW 0xe0023
> > +#define
> > DP_ALLOCATED_BW 0xe0024
> > +
> > +#define DP_TUNNELING_STATUS 0xe0025
> > +#define DP_BW_ALLOCATION_CAPABILITY_CHANGED (1 << 3)
> > +#define DP_ESTIMATED_BW_CHANGED (1 << 2)
> > +#define DP_BW_REQUEST_SUCCEEDED (1 << 1)
> > +#define DP_BW_REQUEST_FAILED (1 << 0)
> > +
> > +#define DP_TUNNELING_MAX_LINK_RATE 0xe0028
> > +
> > +#define DP_TUNNELING_MAX_LANE_COUNT 0xe0029
> > +#define DP_TUNNELING_MAX_LANE_COUNT_MASK 0x1f
> > +
> > +#define DP_DPTX_BW_ALLOCATION_MODE_CONTROL 0xe0030
> > +#define DP_DISPLAY_DRIVER_BW_ALLOCATION_MODE_ENABLE (1 << 7)
> > +#define DP_UNMASK_BW_ALLOCATION_IRQ (1 << 6)
> > +
> > +#define DP_REQUEST_BW 0xe0031
> > +#define MAX_DP_REQUEST_BW 255
> > +
> > /* LTTPR: Link Training (LT)-tunable PHY Repeaters */
> > #define DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV 0xf0000
> > /* 1.3 */
> > #define DP_MAX_LINK_RATE_PHY_REPEATER 0xf0001
> > /* 1.4a */
> > diff --git a/include/drm/display/drm_dp_tunnel.h
> > b/include/drm/display/drm_dp_tunnel.h
> > new file mode 100644
> > index 0000000000000..f6449b1b4e6e9
> > --- /dev/null
> > +++ b/include/drm/display/drm_dp_tunnel.h
> > @@ -0,0 +1,270 @@
> > +/* SPDX-License-Identifier: MIT */
> > +/*
> > + * Copyright © 2023 Intel Corporation
> > + */
> > +
> > +#ifndef __DRM_DP_TUNNEL_H__
> > +#define __DRM_DP_TUNNEL_H__
> > +
> > +#include <linux/err.h>
> > +#include <linux/errno.h>
> > +#include <linux/types.h>
> > +
> > +struct drm_dp_aux;
> > +
> > +struct drm_device;
> > +
> > +struct drm_atomic_state;
> > +struct drm_dp_tunnel_mgr;
> > +struct drm_dp_tunnel_state;
> > +
> > +struct ref_tracker;
> > +
> > +struct drm_dp_tunnel_ref {
> > + struct drm_dp_tunnel *tunnel;
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > + struct ref_tracker *tracker;
> > +#endif
> > +};
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DP_TUNNEL
> > +
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_get_untracked(struct drm_dp_tunnel *tunnel);
> > +void drm_dp_tunnel_put_untracked(struct drm_dp_tunnel *tunnel);
> > +
> > +#ifdef CONFIG_DRM_DISPLAY_DEBUG_DP_TUNNEL_STATE
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_get(struct drm_dp_tunnel *tunnel, struct ref_tracker
> > **tracker);
> > +
> > +void
> > +drm_dp_tunnel_put(struct drm_dp_tunnel *tunnel, struct ref_tracker
> > **tracker);
> > +#else
> > +#define drm_dp_tunnel_get(tunnel, tracker) \
> > + drm_dp_tunnel_get_untracked(tunnel)
> > +
> > +#define drm_dp_tunnel_put(tunnel, tracker) \
> > + drm_dp_tunnel_put_untracked(tunnel)
> > +
> > +#endif
> > +
> > +static inline void drm_dp_tunnel_ref_get(struct drm_dp_tunnel
> > *tunnel,
> > + struct drm_dp_tunnel_ref
> > *tunnel_ref)
> > +{
> > + tunnel_ref->tunnel = drm_dp_tunnel_get(tunnel, &tunnel_ref-
> > >tracker);
> > +}
> > +
> > +static inline void drm_dp_tunnel_ref_put(struct drm_dp_tunnel_ref
> > *tunnel_ref)
> > +{
> > + drm_dp_tunnel_put(tunnel_ref->tunnel, &tunnel_ref->tracker);
> > +}
> > +
> > +struct drm_dp_tunnel *
> > +drm_dp_tunnel_detect(struct drm_dp_tunnel_mgr *mgr,
> > + struct drm_dp_aux *aux);
> > +int drm_dp_tunnel_destroy(struct drm_dp_tunnel *tunnel);
> > +
> > +int drm_dp_tunnel_enable_bw_alloc(struct drm_dp_tunnel *tunnel);
> > +int drm_dp_tunnel_disable_bw_alloc(struct drm_dp_tunnel *tunnel);
> > +bool drm_dp_tunnel_bw_alloc_is_enabled(const struct drm_dp_tunnel
> > *tunnel);
> > +int drm_dp_tunnel_alloc_bw(struct drm_dp_tunnel *tunnel, int bw);
> > +int drm_dp_tunnel_check_state(struct drm_dp_tunnel *tunnel);
> > +int drm_dp_tunnel_update_state(struct drm_dp_tunnel *tunnel);
> > +
> > +void drm_dp_tunnel_set_io_error(struct drm_dp_tunnel *tunnel);
> > +
> > +int drm_dp_tunnel_handle_irq(struct drm_dp_tunnel_mgr *mgr,
> > + struct drm_dp_aux *aux);
> > +
> > +int drm_dp_tunnel_max_dprx_rate(const struct drm_dp_tunnel *tunnel);
> > +int drm_dp_tunnel_max_dprx_lane_count(const struct drm_dp_tunnel
> > *tunnel);
> > +int drm_dp_tunnel_available_bw(const struct drm_dp_tunnel *tunnel);
> > +
> > +const char *drm_dp_tunnel_name(const struct drm_dp_tunnel *tunnel);
> > +
> > +struct drm_dp_tunnel_state *
> > +drm_dp_tunnel_atomic_get_state(struct drm_atomic_state *state,
> > + struct drm_dp_tunnel *tunnel);
> > +struct drm_dp_tunnel_state *
> > +drm_dp_tunnel_atomic_get_new_state(struct drm_atomic_state *state,
> > + const struct drm_dp_tunnel
> > *tunnel);
> > +
> > +void drm_dp_tunnel_atomic_clear_state(struct drm_dp_tunnel_state
> > *tunnel_state);
> > +
> > +int drm_dp_tunnel_atomic_set_stream_bw(struct drm_atomic_state
> > *state,
> > + struct drm_dp_tunnel *tunnel,
> > + u8 stream_id, int bw);
> > +int drm_dp_tunnel_atomic_get_group_streams_in_state(struct
> > drm_atomic_state *state,
> > + const struct
> > drm_dp_tunnel *tunnel,
> > + u32
> > *stream_mask);
> > +
> > +int drm_dp_tunnel_atomic_check_stream_bws(struct drm_atomic_state
> > *state,
> > + u32 *failed_stream_mask);
> > +
> > +int drm_dp_tunnel_atomic_get_tunnel_bw(const struct
> > drm_dp_tunnel_state *tunnel_state);
> > +
> > +struct drm_dp_tunnel_mgr *
> > +drm_dp_tunnel_mgr_create(struct drm_device *dev, int
> > max_group_count);
> > +void drm_dp_tunnel_mgr_destroy(struct drm_dp_tunnel_mgr *mgr);
> > +
> > +#else
> > +
> > +static inline struct drm_dp_tunnel *
> > +drm_dp_tunnel_get_untracked(struct drm_dp_tunnel *tunnel)
> > +{
> > + return NULL;
> > +}
> > +
> > +static inline void
> > +drm_dp_tunnel_put_untracked(struct drm_dp_tunnel *tunnel) {}
> > +
> > +static inline struct drm_dp_tunnel *
> > +drm_dp_tunnel_get(struct drm_dp_tunnel *tunnel, struct ref_tracker
> > **tracker)
> > +{
> > + return NULL;
> > +}
> > +
> > +static inline void
> > +drm_dp_tunnel_put(struct drm_dp_tunnel *tunnel, struct ref_tracker
> > **tracker) {}
> > +
> > +static inline void drm_dp_tunnel_ref_get(struct drm_dp_tunnel
> > *tunnel,
> > + struct drm_dp_tunnel_ref
> > *tunnel_ref) {}
> > +static inline void drm_dp_tunnel_ref_put(struct drm_dp_tunnel_ref
> > *tunnel_ref) {}
> > +
> > +static inline struct drm_dp_tunnel *
> > +drm_dp_tunnel_detect(struct drm_dp_tunnel_mgr *mgr,
> > + struct drm_dp_aux *aux)
> > +{
> > + return ERR_PTR(-EOPNOTSUPP);
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_destroy(struct drm_dp_tunnel *tunnel)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline int drm_dp_tunnel_enable_bw_alloc(struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int drm_dp_tunnel_disable_bw_alloc(struct
> > drm_dp_tunnel *tunnel)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline bool drm_dp_tunnel_bw_alloc_is_enabled(const struct
> > drm_dp_tunnel *tunnel)
> > +{
> > + return false;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_alloc_bw(struct drm_dp_tunnel *tunnel, int bw)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_check_state(struct drm_dp_tunnel *tunnel)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_update_state(struct drm_dp_tunnel *tunnel)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline void drm_dp_tunnel_set_io_error(struct drm_dp_tunnel
> > *tunnel) {}
> > +static inline int
> > +drm_dp_tunnel_handle_irq(struct drm_dp_tunnel_mgr *mgr,
> > + struct drm_dp_aux *aux)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_max_dprx_rate(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_max_dprx_lane_count(const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_available_bw(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return -1;
> > +}
> > +
> > +static inline const char *
> > +drm_dp_tunnel_name(const struct drm_dp_tunnel *tunnel)
> > +{
> > + return NULL;
> > +}
> > +
> > +static inline struct drm_dp_tunnel_state *
> > +drm_dp_tunnel_atomic_get_state(struct drm_atomic_state *state,
> > + struct drm_dp_tunnel *tunnel)
> > +{
> > + return ERR_PTR(-EOPNOTSUPP);
> > +}
> > +
> > +static inline struct drm_dp_tunnel_state *
> > +drm_dp_tunnel_atomic_get_new_state(struct drm_atomic_state *state,
> > + const struct drm_dp_tunnel
> > *tunnel)
> > +{
> > + return ERR_PTR(-EOPNOTSUPP);
> > +}
> > +
> > +static inline void
> > +drm_dp_tunnel_atomic_clear_state(struct drm_dp_tunnel_state
> > *tunnel_state) {}
> > +
> > +static inline int
> > +drm_dp_tunnel_atomic_set_stream_bw(struct drm_atomic_state *state,
> > + struct drm_dp_tunnel *tunnel,
> > + u8 stream_id, int bw)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_atomic_get_group_streams_in_state(struct
> > drm_atomic_state *state,
> > + const struct
> > drm_dp_tunnel *tunnel,
> > + u32 *stream_mask)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_atomic_check_stream_bws(struct drm_atomic_state
> > *state,
> > + u32 *failed_stream_mask)
> > +{
> > + return -EOPNOTSUPP;
> > +}
> > +
> > +static inline int
> > +drm_dp_tunnel_atomic_get_tunnel_bw(const struct drm_dp_tunnel_state
> > *tunnel_state)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline struct drm_dp_tunnel_mgr *
> > +drm_dp_tunnel_mgr_create(struct drm_device *dev, int
> > max_group_count)
> > +{
> > + return ERR_PTR(-EOPNOTSUPP);
> > +}
> > +
> > +static inline
> > +void drm_dp_tunnel_mgr_destroy(struct drm_dp_tunnel_mgr *mgr) {}
> > +
> > +
> > +#endif /* CONFIG_DRM_DISPLAY_DP_TUNNEL */
> > +
> > +#endif /* __DRM_DP_TUNNEL_H__ */
>
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