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/*
* Copyright © 2011 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
* Authors:
* James C. Gualario <james.c.gualario@intel.com>
*
*/
#include "psb_umevents.h"
#include "psb_dpst.h"
/**
* inform the kernel of the work to be performed and related function.
*
*/
DECLARE_WORK(dpst_dev_change_work, &psb_dpst_dev_change_wq);
/**
* psb_dpst_notify_change_um - notify user mode of hotplug changes
*
* @name: name of event to notify user mode of change to
* @state: dpst state struct to get workqueue from
*
*/
int psb_dpst_notify_change_um(enum dpst_event_enum event,
struct dpst_state *state)
{
if (state == NULL)
return IRQ_HANDLED;
state->dpst_change_wq_data.dev_name_arry_rw_status
[state->dpst_change_wq_data.dev_name_write] =
DRM_DPST_READY_TO_READ;
state->dpst_change_wq_data.dpst_events
[state->dpst_change_wq_data.dev_name_write] =
event;
if (state->dpst_change_wq_data.dev_name_read_write_wrap_ack == 1)
state->dpst_change_wq_data.dev_name_read_write_wrap_ack = 0;
state->dpst_change_wq_data.dev_name_write++;
if (state->dpst_change_wq_data.dev_name_write ==
state->dpst_change_wq_data.dev_name_read) {
state->dpst_change_wq_data.dev_name_write--;
return IRQ_NONE;
}
if (state->dpst_change_wq_data.dev_name_write >
DRM_DPST_RING_DEPTH_MAX) {
state->dpst_change_wq_data.dev_name_write = 0;
state->dpst_change_wq_data.dev_name_write_wrap = 1;
}
state->dpst_change_wq_data.hotplug_dev_list = state->list;
queue_work(state->dpst_wq, &(state->dpst_change_wq_data.work));
return IRQ_HANDLED;
}
/*EXPORT_SYMBOL(psb_dpst_notify_change_um); */
/**
*
* psb_dpst_create_and_notify_um - create and notify user mode of new dev
*
* @name: name to give for new event / device
* @state: dpst state instaces to associate event with
*
*/
struct umevent_obj *psb_dpst_create_and_notify_um(const char *name,
struct dpst_state *state)
{
return psb_create_umevent_obj(name, state->list);
}
/*EXPORT_SYMBOL(psb_dpst_create_and_notify_um); */
/**
* psb_dpst_device_pool_create_and_init - make new hotplug device pool
*
* @parent_kobj - parent kobject to associate dpst kset with
* @state - dpst state instance to associate list with
*
*/
struct umevent_list *psb_dpst_device_pool_create_and_init(
struct kobject *parent_kobj,
struct dpst_state *state)
{
struct umevent_list *new_hotplug_dev_list = NULL;
new_hotplug_dev_list = psb_umevent_create_list();
if (new_hotplug_dev_list)
psb_umevent_init(parent_kobj, new_hotplug_dev_list,
"psb_dpst");
state->dpst_wq = create_singlethread_workqueue("dpst-wq");
if (!state->dpst_wq)
return NULL;
INIT_WORK(&state->dpst_change_wq_data.work, psb_dpst_dev_change_wq);
state->dpst_change_wq_data.dev_name_read = 0;
state->dpst_change_wq_data.dev_name_write = 0;
state->dpst_change_wq_data.dev_name_write_wrap = 0;
state->dpst_change_wq_data.dev_name_read_write_wrap_ack = 0;
memset(&(state->dpst_change_wq_data.dev_name_arry_rw_status[0]),
0, sizeof(int)*DRM_DPST_RING_DEPTH);
return new_hotplug_dev_list;
}
/*EXPORT_SYMBOL(psb_dpst_device_pool_create_and_init); */
/**
* psb_dpst_init - init dpst subsystem
* @parent_kobj - parent kobject to associate dpst state with
*
*/
struct dpst_state *psb_dpst_init(struct kobject *parent_kobj)
{
struct dpst_state *state;
struct umevent_obj *working_umevent;
state = kzalloc(sizeof(struct dpst_state), GFP_KERNEL);
if (state == NULL) {
DRM_ERROR("Failure in memory allocation\n");
return NULL;
}
state->list = NULL;
state->list = psb_dpst_device_pool_create_and_init(
parent_kobj,
state);
if (state->list == NULL) {
DRM_ERROR("Failure in memory allocation\n");
kfree(state);
return NULL;
}
working_umevent =
psb_dpst_create_and_notify_um("init",
state);
if (working_umevent == NULL) {
DRM_ERROR("Out of Memory\n");
goto failed_umevent;
}
state->dpst_change_wq_data.dev_umevent_arry
[DPST_EVENT_INIT_COMPLETE] = &(working_umevent->head);
working_umevent =
psb_dpst_create_and_notify_um("hist_int",
state);
if (working_umevent == NULL) {
DRM_ERROR("Out of Memory\n");
goto failed_umevent;
}
state->dpst_change_wq_data.dev_umevent_arry
[DPST_EVENT_HIST_INTERRUPT] = &(working_umevent->head);
working_umevent =
psb_dpst_create_and_notify_um("term",
state);
if (working_umevent == NULL) {
DRM_ERROR("Out of Memory\n");
goto failed_umevent;
}
state->dpst_change_wq_data.dev_umevent_arry
[DPST_EVENT_TERMINATE] = &(working_umevent->head);
working_umevent =
psb_dpst_create_and_notify_um("phase_done",
state);
if (working_umevent == NULL) {
DRM_ERROR("Out of Memory\n");
goto failed_umevent;
}
state->dpst_change_wq_data.dev_umevent_arry
[DPST_EVENT_PHASE_COMPLETE] = &(working_umevent->head);
return state;
failed_umevent:
psb_dpst_device_pool_destroy(state);
return NULL;
}
/*EXPORT_SYMBOL(psb_dpst_init); */
/**
* psb_dpst_device_pool_destroy - destroy all dpst related resources
*
* @state: dpst state instance to destroy
*
*/
void psb_dpst_device_pool_destroy(struct dpst_state *state)
{
int i;
struct umevent_list *list;
list = state->list;
flush_workqueue(state->dpst_wq);
destroy_workqueue(state->dpst_wq);
for (i = 0; i < DRM_DPST_MAX_NUM_EVENTS; i++) {
state->dpst_change_wq_data.dev_umevent_arry[i] = NULL;
}
psb_umevent_cleanup(list);
kfree(state);
}
/*EXPORT_SYMBOL(psb_dpst_device_pool_destroy); */
/**
* psb_dpst_dev_change_wq - change workqueue implementation
*
* @work: work struct to use for kernel scheduling
*
*/
void psb_dpst_dev_change_wq(struct work_struct *work)
{
struct dpst_disp_workqueue_data *wq_data;
int curr_event_index;
wq_data = to_dpst_disp_workqueue_data(work);
if (wq_data->dev_name_write_wrap == 1) {
wq_data->dev_name_read_write_wrap_ack = 1;
wq_data->dev_name_write_wrap = 0;
while (wq_data->dev_name_read != DRM_DPST_RING_DEPTH_MAX) {
if (wq_data->dev_name_arry_rw_status
[wq_data->dev_name_read] ==
DRM_DPST_READY_TO_READ) {
wq_data->dev_name_arry_rw_status
[wq_data->dev_name_read] =
DRM_DPST_READ_COMPLETE;
curr_event_index = wq_data->dpst_events
[wq_data->dev_name_read];
psb_umevent_notify_change_gfxsock
(list_entry(
(wq_data->dev_umevent_arry
[curr_event_index]),
struct umevent_obj, head),
DRM_DPST_SOCKET_GROUP_ID);
}
wq_data->dev_name_read++;
}
wq_data->dev_name_read = 0;
while (wq_data->dev_name_read < wq_data->dev_name_write-1) {
if (wq_data->dev_name_arry_rw_status
[wq_data->dev_name_read] ==
DRM_DPST_READY_TO_READ) {
wq_data->dev_name_arry_rw_status
[wq_data->dev_name_read] =
DRM_DPST_READ_COMPLETE;
curr_event_index = wq_data->dpst_events
[wq_data->dev_name_read];
psb_umevent_notify_change_gfxsock
(list_entry(
(wq_data->dev_umevent_arry
[curr_event_index]),
struct umevent_obj, head),
DRM_DPST_SOCKET_GROUP_ID);
}
wq_data->dev_name_read++;
}
} else {
while (wq_data->dev_name_read < wq_data->dev_name_write) {
if (wq_data->dev_name_arry_rw_status
[wq_data->dev_name_read] ==
DRM_DPST_READY_TO_READ) {
wq_data->dev_name_arry_rw_status
[wq_data->dev_name_read] =
DRM_DPST_READ_COMPLETE;
curr_event_index = wq_data->dpst_events
[wq_data->dev_name_read];
psb_umevent_notify_change_gfxsock
(list_entry(
(wq_data->dev_umevent_arry
[curr_event_index]),
struct umevent_obj, head),
DRM_DPST_SOCKET_GROUP_ID);
}
wq_data->dev_name_read++;
}
}
if (wq_data->dev_name_read > DRM_DPST_RING_DEPTH_MAX)
wq_data->dev_name_read = 0;
}
/*EXPORT_SYMBOL(psb_dpst_dev_change_wq); */
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