kolibrios/drivers/video/drm/i915/kms_display.c

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#define iowrite32(v, addr) writel((v), (addr))
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include "intel_drv.h"
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <errno-base.h>
#include <linux/pci.h>
#include <syscall.h>
#include "bitmap.h"
typedef struct
{
kobj_t header;
uint32_t *data;
uint32_t hot_x;
uint32_t hot_y;
struct list_head list;
struct drm_i915_gem_object *cobj;
}cursor_t;
#define CURSOR_WIDTH 64
#define CURSOR_HEIGHT 64
struct tag_display
{
int x;
int y;
int width;
int height;
int bpp;
int vrefresh;
int pitch;
int lfb;
int supported_modes;
struct drm_device *ddev;
struct drm_connector *connector;
struct drm_crtc *crtc;
struct list_head cursors;
cursor_t *cursor;
int (*init_cursor)(cursor_t*);
cursor_t* (__stdcall *select_cursor)(cursor_t*);
void (*show_cursor)(int show);
void (__stdcall *move_cursor)(cursor_t *cursor, int x, int y);
void (__stdcall *restore_cursor)(int x, int y);
void (*disable_mouse)(void);
u32 mask_seqno;
u32 check_mouse;
u32 check_m_pixel;
};
static display_t *os_display;
u32_t cmd_buffer;
u32_t cmd_offset;
void init_render();
int sna_init();
int init_cursor(cursor_t *cursor);
static cursor_t* __stdcall select_cursor_kms(cursor_t *cursor);
static void __stdcall move_cursor_kms(cursor_t *cursor, int x, int y);
void __stdcall restore_cursor(int x, int y)
{};
void disable_mouse(void)
{};
static char *manufacturer_name(unsigned char *x)
{
static char name[4];
name[0] = ((x[0] & 0x7C) >> 2) + '@';
name[1] = ((x[0] & 0x03) << 3) + ((x[1] & 0xE0) >> 5) + '@';
name[2] = (x[1] & 0x1F) + '@';
name[3] = 0;
return name;
}
bool set_mode(struct drm_device *dev, struct drm_connector *connector,
videomode_t *reqmode, bool strict)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_fb_helper *fb_helper = &dev_priv->fbdev->helper;
struct drm_mode_config *config = &dev->mode_config;
struct drm_display_mode *mode = NULL, *tmpmode;
struct drm_framebuffer *fb = NULL;
struct drm_crtc *crtc;
struct drm_encoder *encoder;
struct drm_i915_gem_object *fb_obj;
struct drm_mode_set set;
const char *con_name;
const char *enc_name;
unsigned hdisplay, vdisplay;
int ret;
mutex_lock(&dev->mode_config.mutex);
list_for_each_entry(tmpmode, &connector->modes, head)
{
if( (drm_mode_width(tmpmode) == reqmode->width) &&
(drm_mode_height(tmpmode) == reqmode->height) &&
(drm_mode_vrefresh(tmpmode) == reqmode->freq) )
{
mode = tmpmode;
goto do_set;
}
};
if( (mode == NULL) && (strict == false) )
{
list_for_each_entry(tmpmode, &connector->modes, head)
{
if( (drm_mode_width(tmpmode) == reqmode->width) &&
(drm_mode_height(tmpmode) == reqmode->height) )
{
mode = tmpmode;
goto do_set;
}
};
};
DRM_ERROR("%s failed\n", __FUNCTION__);
return -1;
do_set:
encoder = connector->encoder;
crtc = encoder->crtc;
con_name = drm_get_connector_name(connector);
enc_name = drm_get_encoder_name(encoder);
DRM_DEBUG_KMS("set mode %d %d: crtc %d connector %s encoder %s\n",
reqmode->width, reqmode->height, crtc->base.id,
con_name, enc_name);
drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
hdisplay = mode->hdisplay;
vdisplay = mode->vdisplay;
if (crtc->invert_dimensions)
swap(hdisplay, vdisplay);
fb_obj = get_fb_obj();
fb = fb_helper->fb;
fb->width = reqmode->width;
fb->height = reqmode->height;
fb->pitches[0] = fb->pitches[1] = fb->pitches[2] =
fb->pitches[3] = ALIGN(reqmode->width * 4, 512);
fb_obj->stride = fb->pitches[0];
fb->bits_per_pixel = 32;
fb->depth = 24;
crtc->fb = fb;
crtc->enabled = true;
os_display->crtc = crtc;
i915_gem_object_put_fence(fb_obj);
set.crtc = crtc;
set.x = 0;
set.y = 0;
set.mode = mode;
set.connectors = &connector;
set.num_connectors = 1;
set.fb = fb;
ret = crtc->funcs->set_config(&set);
mutex_unlock(&dev->mode_config.mutex);
if ( !ret )
{
os_display->width = fb->width;
os_display->height = fb->height;
os_display->vrefresh = drm_mode_vrefresh(mode);
sysSetScreen(fb->width, fb->height, fb->pitches[0]);
DRM_DEBUG_KMS("new mode %d x %d pitch %d\n",
fb->width, fb->height, fb->pitches[0]);
}
else
DRM_ERROR("failed to set mode %d_%d on crtc %p\n",
fb->width, fb->height, crtc);
return ret;
}
static int count_connector_modes(struct drm_connector* connector)
{
struct drm_display_mode *mode;
int count = 0;
list_for_each_entry(mode, &connector->modes, head)
{
count++;
};
return count;
};
static struct drm_connector* get_def_connector(struct drm_device *dev)
{
struct drm_connector *connector;
struct drm_connector_helper_funcs *connector_funcs;
struct drm_connector *def_connector = NULL;
list_for_each_entry(connector, &dev->mode_config.connector_list, head)
{
struct drm_encoder *encoder;
struct drm_crtc *crtc;
if( connector->status != connector_status_connected)
continue;
connector_funcs = connector->helper_private;
encoder = connector_funcs->best_encoder(connector);
if( encoder == NULL)
continue;
connector->encoder = encoder;
crtc = encoder->crtc;
DRM_DEBUG_KMS("CONNECTOR %x ID: %d status %d encoder %x\n crtc %x",
connector, connector->base.id,
connector->status, connector->encoder,
crtc);
// if (crtc == NULL)
// continue;
def_connector = connector;
break;
};
return def_connector;
};
struct drm_connector *get_active_connector(struct drm_device *dev)
{
struct drm_connector *tmp = NULL;
struct drm_connector_helper_funcs *connector_funcs;
struct drm_encoder *encoder;
list_for_each_entry(tmp, &dev->mode_config.connector_list, head)
{
if( tmp->status != connector_status_connected)
continue;
connector_funcs = tmp->helper_private;
encoder = connector_funcs->best_encoder(tmp);
if( encoder == NULL)
{
DRM_DEBUG_KMS("CONNECTOR %x ID: %d no active encoders\n",
tmp, tmp->base.id);
continue;
};
tmp->encoder = encoder;
DRM_DEBUG_KMS("CONNECTOR %p ID:%d status:%d ENCODER %x CRTC %p ID:%d\n",
tmp, tmp->base.id, tmp->status, tmp->encoder,
tmp->encoder->crtc, tmp->encoder->crtc->base.id );
return tmp;
};
return NULL;
}
struct drm_crtc *get_possible_crtc(struct drm_device *dev, struct drm_encoder *encoder)
{
struct drm_crtc *tmp_crtc;
int crtc_mask = 1;
list_for_each_entry(tmp_crtc, &dev->mode_config.crtc_list, head)
{
if (encoder->possible_crtcs & crtc_mask)
{
encoder->crtc = tmp_crtc;
dbgprintf("CRTC %p\n", tmp_crtc);
return tmp_crtc;
};
crtc_mask <<= 1;
};
return NULL;
};
int get_boot_mode(struct drm_connector *connector, videomode_t *usermode)
{
struct drm_display_mode *mode;
list_for_each_entry(mode, &connector->modes, head)
{
DRM_DEBUG_KMS("check mode w:%d h:%d %dHz\n",
drm_mode_width(mode), drm_mode_height(mode),
drm_mode_vrefresh(mode));
if( os_display->width == drm_mode_width(mode) &&
os_display->height == drm_mode_height(mode) &&
drm_mode_vrefresh(mode) == 60)
{
usermode->width = os_display->width;
usermode->height = os_display->height;
usermode->freq = 60;
return 1;
}
}
return 0;
}
int init_display_kms(struct drm_device *dev, videomode_t *usermode)
{
struct drm_connector *connector;
struct drm_connector_helper_funcs *connector_funcs;
struct drm_encoder *encoder;
struct drm_crtc *crtc;
struct drm_framebuffer *fb;
cursor_t *cursor;
u32_t ifl;
int err;
mutex_lock(&dev->mode_config.mutex);
connector = get_active_connector(dev) ;
if(connector == NULL)
{
DRM_DEBUG_KMS("No active connectors!\n");
mutex_unlock(&dev->mode_config.mutex);
return -1;
};
encoder = connector->encoder;
crtc = encoder->crtc;
if(crtc == NULL)
crtc = get_possible_crtc(dev, encoder);
if(crtc == NULL)
{
DRM_DEBUG_KMS("No CRTC for encoder %d\n", encoder->base.id);
mutex_unlock(&dev->mode_config.mutex);
return -1;
};
DRM_DEBUG_KMS("[Select CRTC: %p ID:%d]\n",crtc, crtc->base.id);
os_display = GetDisplay();
os_display->ddev = dev;
os_display->connector = connector;
os_display->crtc = crtc;
os_display->supported_modes = count_connector_modes(connector);
ifl = safe_cli();
{
struct intel_crtc *intel_crtc = to_intel_crtc(os_display->crtc);
list_for_each_entry(cursor, &os_display->cursors, list)
{
init_cursor(cursor);
};
os_display->restore_cursor(0,0);
os_display->init_cursor = init_cursor;
os_display->select_cursor = select_cursor_kms;
os_display->show_cursor = NULL;
os_display->move_cursor = move_cursor_kms;
os_display->restore_cursor = restore_cursor;
os_display->disable_mouse = disable_mouse;
intel_crtc->cursor_x = os_display->width/2;
intel_crtc->cursor_y = os_display->height/2;
select_cursor_kms(os_display->cursor);
};
safe_sti(ifl);
if( (usermode->width == 0) ||
(usermode->height == 0))
{
if( !get_boot_mode(connector, usermode))
{
struct drm_display_mode *mode;
mode = list_entry(connector->modes.next, typeof(*mode), head);
usermode->width = drm_mode_width(mode);
usermode->height = drm_mode_height(mode);
usermode->freq = drm_mode_vrefresh(mode);
};
};
mutex_unlock(&dev->mode_config.mutex);
set_mode(dev, os_display->connector, usermode, false);
#ifdef __HWA__
err = init_bitmaps();
#endif
LEAVE();
return 0;
};
int get_videomodes(videomode_t *mode, int *count)
{
int err = -1;
// dbgprintf("mode %x count %d\n", mode, *count);
if( *count == 0 )
{
*count = os_display->supported_modes;
err = 0;
}
else if( mode != NULL )
{
struct drm_display_mode *drmmode;
int i = 0;
if( *count > os_display->supported_modes)
*count = os_display->supported_modes;
list_for_each_entry(drmmode, &os_display->connector->modes, head)
{
if( i < *count)
{
mode->width = drm_mode_width(drmmode);
mode->height = drm_mode_height(drmmode);
mode->bpp = 32;
mode->freq = drm_mode_vrefresh(drmmode);
i++;
mode++;
}
else break;
};
*count = i;
err = 0;
};
return err;
};
int set_user_mode(videomode_t *mode)
{
int err = -1;
// dbgprintf("width %d height %d vrefresh %d\n",
// mode->width, mode->height, mode->freq);
if( (mode->width != 0) &&
(mode->height != 0) &&
(mode->freq != 0 ) &&
( (mode->width != os_display->width) ||
(mode->height != os_display->height) ||
(mode->freq != os_display->vrefresh) ) )
{
if( set_mode(os_display->ddev, os_display->connector, mode, true) )
err = 0;
};
return err;
};
void i915_dpms(struct drm_device *dev, int mode)
{
const struct drm_connector_funcs *f = os_display->connector->funcs;
f->dpms(os_display->connector, mode);
};
void __attribute__((regparm(1))) destroy_cursor(cursor_t *cursor)
{
list_del(&cursor->list);
i915_gem_object_unpin(cursor->cobj);
mutex_lock(&main_device->struct_mutex);
drm_gem_object_unreference(&cursor->cobj->base);
mutex_unlock(&main_device->struct_mutex);
__DestroyObject(cursor);
};
int init_cursor(cursor_t *cursor)
{
struct drm_i915_private *dev_priv = os_display->ddev->dev_private;
struct drm_i915_gem_object *obj;
uint32_t *bits;
uint32_t *src;
void *mapped;
int i,j;
int ret;
if (dev_priv->info->cursor_needs_physical)
{
bits = (uint32_t*)KernelAlloc(CURSOR_WIDTH*CURSOR_HEIGHT*4);
if (unlikely(bits == NULL))
return ENOMEM;
cursor->cobj = (struct drm_i915_gem_object *)GetPgAddr(bits);
}
else
{
obj = i915_gem_alloc_object(os_display->ddev, CURSOR_WIDTH*CURSOR_HEIGHT*4);
if (unlikely(obj == NULL))
return -ENOMEM;
ret = i915_gem_obj_ggtt_pin(obj, CURSOR_WIDTH*CURSOR_HEIGHT*4, true, true);
if (ret) {
drm_gem_object_unreference(&obj->base);
return ret;
}
ret = i915_gem_object_set_to_gtt_domain(obj, true);
if (ret)
{
i915_gem_object_unpin(obj);
drm_gem_object_unreference(&obj->base);
return ret;
}
/* You don't need to worry about fragmentation issues.
* GTT space is continuous. I guarantee it. */
mapped = bits = (u32*)MapIoMem(dev_priv->gtt.mappable_base + i915_gem_obj_ggtt_offset(obj),
CURSOR_WIDTH*CURSOR_HEIGHT*4, PG_SW);
if (unlikely(bits == NULL))
{
i915_gem_object_unpin(obj);
drm_gem_object_unreference(&obj->base);
return -ENOMEM;
};
cursor->cobj = obj;
};
src = cursor->data;
for(i = 0; i < 32; i++)
{
for(j = 0; j < 32; j++)
*bits++ = *src++;
for(j = 32; j < CURSOR_WIDTH; j++)
*bits++ = 0;
}
for(i = 0; i < CURSOR_WIDTH*(CURSOR_HEIGHT-32); i++)
*bits++ = 0;
FreeKernelSpace(mapped);
// release old cursor
KernelFree(cursor->data);
cursor->data = bits;
cursor->header.destroy = destroy_cursor;
return 0;
}
static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base)
{
struct drm_device *dev = crtc->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
int pipe = intel_crtc->pipe;
bool visible = base != 0;
if (intel_crtc->cursor_visible != visible) {
uint32_t cntl = I915_READ(CURCNTR(pipe));
if (base) {
cntl &= ~(CURSOR_MODE | MCURSOR_PIPE_SELECT);
cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
cntl |= pipe << 28; /* Connect to correct pipe */
} else {
cntl &= ~(CURSOR_MODE | MCURSOR_GAMMA_ENABLE);
cntl |= CURSOR_MODE_DISABLE;
}
I915_WRITE(CURCNTR(pipe), cntl);
intel_crtc->cursor_visible = visible;
}
/* and commit changes on next vblank */
I915_WRITE(CURBASE(pipe), base);
}
void __stdcall move_cursor_kms(cursor_t *cursor, int x, int y)
{
struct drm_i915_private *dev_priv = os_display->ddev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(os_display->crtc);
u32 base, pos;
bool visible;
int pipe = intel_crtc->pipe;
intel_crtc->cursor_x = x;
intel_crtc->cursor_y = y;
x = x - cursor->hot_x;
y = y - cursor->hot_y;
pos = 0;
base = intel_crtc->cursor_addr;
if (x >= os_display->width)
base = 0;
if (y >= os_display->height)
base = 0;
if (x < 0)
{
if (x + intel_crtc->cursor_width < 0)
base = 0;
pos |= CURSOR_POS_SIGN << CURSOR_X_SHIFT;
x = -x;
}
pos |= x << CURSOR_X_SHIFT;
if (y < 0)
{
if (y + intel_crtc->cursor_height < 0)
base = 0;
pos |= CURSOR_POS_SIGN << CURSOR_Y_SHIFT;
y = -y;
}
pos |= y << CURSOR_Y_SHIFT;
visible = base != 0;
if (!visible && !intel_crtc->cursor_visible)
return;
I915_WRITE(CURPOS(pipe), pos);
// if (IS_845G(dev) || IS_I865G(dev))
// i845_update_cursor(crtc, base);
// else
i9xx_update_cursor(os_display->crtc, base);
};
cursor_t* __stdcall select_cursor_kms(cursor_t *cursor)
{
struct drm_i915_private *dev_priv = os_display->ddev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(os_display->crtc);
cursor_t *old;
old = os_display->cursor;
os_display->cursor = cursor;
if (!dev_priv->info->cursor_needs_physical)
intel_crtc->cursor_addr = i915_gem_obj_ggtt_offset(cursor->cobj);
else
intel_crtc->cursor_addr = (addr_t)cursor->cobj;
intel_crtc->cursor_width = 32;
intel_crtc->cursor_height = 32;
move_cursor_kms(cursor, intel_crtc->cursor_x, intel_crtc->cursor_y);
return old;
};
int i915_fbinfo(struct drm_i915_fb_info *fb)
{
struct drm_i915_private *dev_priv = os_display->ddev->dev_private;
struct intel_crtc *crtc = to_intel_crtc(os_display->crtc);
struct drm_i915_gem_object *obj = get_fb_obj();
fb->name = obj->base.name;
fb->width = os_display->width;
fb->height = os_display->height;
fb->pitch = obj->stride;
fb->tiling = obj->tiling_mode;
fb->crtc = crtc->base.base.id;
fb->pipe = crtc->pipe;
return 0;
}
typedef struct
{
int left;
int top;
int right;
int bottom;
}rect_t;
#define CURRENT_TASK (0x80003000)
static u32_t get_display_map()
{
u32_t addr;
addr = (u32_t)os_display;
addr+= sizeof(display_t); /* shoot me */
return *(u32_t*)addr;
}
void FASTCALL GetWindowRect(rect_t *rc)__asm__("GetWindowRect");
int i915_mask_update(struct drm_device *dev, void *data,
struct drm_file *file)
{
struct drm_i915_mask *mask = data;
struct drm_gem_object *obj;
static unsigned int mask_seqno[256];
rect_t winrc;
u32 slot;
int ret=0;
if(mask->handle == -2)
{
printf("%s handle %d\n", __FUNCTION__, mask->handle);
return 0;
}
obj = drm_gem_object_lookup(dev, file, mask->handle);
if (obj == NULL)
return -ENOENT;
if (!obj->filp) {
drm_gem_object_unreference_unlocked(obj);
return -EINVAL;
}
GetWindowRect(&winrc);
{
// static warn_count;
mask->width = winrc.right - winrc.left + 1;
mask->height = winrc.bottom - winrc.top + 1;
mask->bo_pitch = (mask->width+15) & ~15;
#if 0
if(warn_count < 1)
{
printf("left %d top %d right %d bottom %d\n",
winrc.left, winrc.top, winrc.right, winrc.bottom);
printf("mask pitch %d data %p\n", mask->bo_pitch, mask->bo_size);
warn_count++;
};
#endif
};
slot = *((u8*)CURRENT_TASK);
if( mask_seqno[slot] != os_display->mask_seqno)
{
u8* src_offset;
u8* dst_offset;
u32 ifl;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
goto err1;
ret = i915_gem_object_set_to_cpu_domain(to_intel_bo(obj), true);
if(ret !=0 )
{
dbgprintf("%s: i915_gem_object_set_to_cpu_domain failed\n", __FUNCTION__);
goto err2;
};
// printf("width %d height %d\n", winrc.right, winrc.bottom);
// slot = 0x01;
src_offset = (u8*)( winrc.top*os_display->width + winrc.left);
src_offset+= get_display_map();
dst_offset = (u8*)mask->bo_map;
u32_t tmp_h = mask->height;
ifl = safe_cli();
{
mask_seqno[slot] = os_display->mask_seqno;
slot|= (slot<<8)|(slot<<16)|(slot<<24);
__asm__ __volatile__ (
"movd %[slot], %%xmm6 \n"
"punpckldq %%xmm6, %%xmm6 \n"
"punpcklqdq %%xmm6, %%xmm6 \n"
:: [slot] "m" (slot)
:"xmm6");
while( tmp_h--)
{
int tmp_w = mask->bo_pitch;
u8* tmp_src = src_offset;
u8* tmp_dst = dst_offset;
src_offset+= os_display->width;
dst_offset+= mask->bo_pitch;
while(tmp_w >= 64)
{
__asm__ __volatile__ (
"movdqu (%0), %%xmm0 \n"
"movdqu 16(%0), %%xmm1 \n"
"movdqu 32(%0), %%xmm2 \n"
"movdqu 48(%0), %%xmm3 \n"
"pcmpeqb %%xmm6, %%xmm0 \n"
"pcmpeqb %%xmm6, %%xmm1 \n"
"pcmpeqb %%xmm6, %%xmm2 \n"
"pcmpeqb %%xmm6, %%xmm3 \n"
"movdqa %%xmm0, (%%edi) \n"
"movdqa %%xmm1, 16(%%edi) \n"
"movdqa %%xmm2, 32(%%edi) \n"
"movdqa %%xmm3, 48(%%edi) \n"
:: "r" (tmp_src), "D" (tmp_dst)
:"xmm0","xmm1","xmm2","xmm3");
tmp_w -= 64;
tmp_src += 64;
tmp_dst += 64;
}
if( tmp_w >= 32 )
{
__asm__ __volatile__ (
"movdqu (%0), %%xmm0 \n"
"movdqu 16(%0), %%xmm1 \n"
"pcmpeqb %%xmm6, %%xmm0 \n"
"pcmpeqb %%xmm6, %%xmm1 \n"
"movdqa %%xmm0, (%%edi) \n"
"movdqa %%xmm1, 16(%%edi) \n"
:: "r" (tmp_src), "D" (tmp_dst)
:"xmm0","xmm1");
tmp_w -= 32;
tmp_src += 32;
tmp_dst += 32;
}
while( tmp_w > 0 )
{
__asm__ __volatile__ (
"movdqu (%0), %%xmm0 \n"
"pcmpeqb %%xmm6, %%xmm0 \n"
"movdqa %%xmm0, (%%edi) \n"
:: "r" (tmp_src), "D" (tmp_dst)
:"xmm0");
tmp_w -= 16;
tmp_src += 16;
tmp_dst += 16;
}
};
};
safe_sti(ifl);
ret = i915_gem_object_set_to_gtt_domain(to_intel_bo(obj), false);
if(ret != 0 )
{
dbgprintf("%s: i915_gem_object_set_to_gtt_domain failed\n", __FUNCTION__);
};
}
err2:
mutex_unlock(&dev->struct_mutex);
err1:
drm_gem_object_unreference(obj);
return ret;
}
#define NSEC_PER_SEC 1000000000L
void getrawmonotonic(struct timespec *ts)
{
u32 tmp = GetTimerTicks();
ts->tv_sec = tmp/100;
ts->tv_nsec = (tmp - ts->tv_sec*100)*10000000;
}
void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec)
{
while (nsec >= NSEC_PER_SEC) {
/*
* The following asm() prevents the compiler from
* optimising this loop into a modulo operation. See
* also __iter_div_u64_rem() in include/linux/time.h
*/
asm("" : "+rm"(nsec));
nsec -= NSEC_PER_SEC;
++sec;
}
while (nsec < 0) {
asm("" : "+rm"(nsec));
nsec += NSEC_PER_SEC;
--sec;
}
ts->tv_sec = sec;
ts->tv_nsec = nsec;
}
void
prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state)
{
unsigned long flags;
// wait->flags &= ~WQ_FLAG_EXCLUSIVE;
spin_lock_irqsave(&q->lock, flags);
if (list_empty(&wait->task_list))
__add_wait_queue(q, wait);
spin_unlock_irqrestore(&q->lock, flags);
}
/**
* finish_wait - clean up after waiting in a queue
* @q: waitqueue waited on
* @wait: wait descriptor
*
* Sets current thread back to running state and removes
* the wait descriptor from the given waitqueue if still
* queued.
*/
void finish_wait(wait_queue_head_t *q, wait_queue_t *wait)
{
unsigned long flags;
// __set_current_state(TASK_RUNNING);
/*
* We can check for list emptiness outside the lock
* IFF:
* - we use the "careful" check that verifies both
* the next and prev pointers, so that there cannot
* be any half-pending updates in progress on other
* CPU's that we haven't seen yet (and that might
* still change the stack area.
* and
* - all other users take the lock (ie we can only
* have _one_ other CPU that looks at or modifies
* the list).
*/
if (!list_empty_careful(&wait->task_list)) {
spin_lock_irqsave(&q->lock, flags);
list_del_init(&wait->task_list);
spin_unlock_irqrestore(&q->lock, flags);
}
DestroyEvent(wait->evnt);
}
int autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key)
{
list_del_init(&wait->task_list);
return 1;
}
unsigned int hweight16(unsigned int w)
{
unsigned int res = w - ((w >> 1) & 0x5555);
res = (res & 0x3333) + ((res >> 2) & 0x3333);
res = (res + (res >> 4)) & 0x0F0F;
return (res + (res >> 8)) & 0x00FF;
}
unsigned long round_jiffies_up_relative(unsigned long j)
{
unsigned long j0 = GetTimerTicks();
/* Use j0 because jiffies might change while we run */
return round_jiffies_common(j + j0, true) - j0;
}