Revert "OMAPFB: simplify locking"
This reverts commit b41deecbda70067b26a3a7704fdf967a7940935b.
The simpler locking causes huge latencies when two processes use the
omapfb, even if they use different framebuffers.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/omapfb/omapfb-sysfs.c b/drivers/video/omap2/omapfb/omapfb-sysfs.c
index be5eb07..18fa9e1 100644
--- a/drivers/video/omap2/omapfb/omapfb-sysfs.c
+++ b/drivers/video/omap2/omapfb/omapfb-sysfs.c
@@ -49,7 +49,6 @@
{
struct fb_info *fbi = dev_get_drvdata(dev);
struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
struct omapfb2_mem_region *rg;
int rot_type;
int r;
@@ -63,13 +62,12 @@
if (!lock_fb_info(fbi))
return -ENODEV;
- omapfb_lock(fbdev);
r = 0;
if (rot_type == ofbi->rotation_type)
goto out;
- rg = ofbi->region;
+ rg = omapfb_get_mem_region(ofbi->region);
if (rg->size) {
r = -EBUSY;
@@ -83,8 +81,8 @@
* need to do any further parameter checking at this point.
*/
put_region:
+ omapfb_put_mem_region(rg);
out:
- omapfb_unlock(fbdev);
unlock_fb_info(fbi);
return r ? r : count;
@@ -106,7 +104,6 @@
{
struct fb_info *fbi = dev_get_drvdata(dev);
struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
bool mirror;
int r;
struct fb_var_screeninfo new_var;
@@ -117,10 +114,11 @@
if (!lock_fb_info(fbi))
return -ENODEV;
- omapfb_lock(fbdev);
ofbi->mirror = mirror;
+ omapfb_get_mem_region(ofbi->region);
+
memcpy(&new_var, &fbi->var, sizeof(new_var));
r = check_fb_var(fbi, &new_var);
if (r)
@@ -135,7 +133,8 @@
r = count;
out:
- omapfb_unlock(fbdev);
+ omapfb_put_mem_region(ofbi->region);
+
unlock_fb_info(fbi);
return r;
@@ -274,11 +273,15 @@
DBG("detaching %d\n", ofbi->overlays[i]->id);
+ omapfb_get_mem_region(ofbi->region);
+
omapfb_overlay_enable(ovl, 0);
if (ovl->manager)
ovl->manager->apply(ovl->manager);
+ omapfb_put_mem_region(ofbi->region);
+
for (t = i + 1; t < ofbi->num_overlays; t++) {
ofbi->rotation[t-1] = ofbi->rotation[t];
ofbi->overlays[t-1] = ofbi->overlays[t];
@@ -311,8 +314,12 @@
}
if (added) {
+ omapfb_get_mem_region(ofbi->region);
+
r = omapfb_apply_changes(fbi, 0);
+ omapfb_put_mem_region(ofbi->region);
+
if (r)
goto out;
}
@@ -330,13 +337,11 @@
{
struct fb_info *fbi = dev_get_drvdata(dev);
struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
ssize_t l = 0;
int t;
if (!lock_fb_info(fbi))
return -ENODEV;
- omapfb_lock(fbdev);
for (t = 0; t < ofbi->num_overlays; t++) {
l += snprintf(buf + l, PAGE_SIZE - l, "%s%d",
@@ -345,7 +350,6 @@
l += snprintf(buf + l, PAGE_SIZE - l, "\n");
- omapfb_unlock(fbdev);
unlock_fb_info(fbi);
return l;
@@ -356,7 +360,6 @@
{
struct fb_info *fbi = dev_get_drvdata(dev);
struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
int num_ovls = 0, r, i;
int len;
bool changed = false;
@@ -368,7 +371,6 @@
if (!lock_fb_info(fbi))
return -ENODEV;
- omapfb_lock(fbdev);
if (len > 0) {
char *p = (char *)buf;
@@ -405,7 +407,12 @@
for (i = 0; i < num_ovls; ++i)
ofbi->rotation[i] = rotation[i];
+ omapfb_get_mem_region(ofbi->region);
+
r = omapfb_apply_changes(fbi, 0);
+
+ omapfb_put_mem_region(ofbi->region);
+
if (r)
goto out;
@@ -414,7 +421,6 @@
r = count;
out:
- omapfb_unlock(fbdev);
unlock_fb_info(fbi);
return r;
@@ -425,19 +431,8 @@
{
struct fb_info *fbi = dev_get_drvdata(dev);
struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
- int r;
- if (!lock_fb_info(fbi))
- return -ENODEV;
- omapfb_lock(fbdev);
-
- r = snprintf(buf, PAGE_SIZE, "%lu\n", ofbi->region->size);
-
- omapfb_unlock(fbdev);
- unlock_fb_info(fbi);
-
- return r;
+ return snprintf(buf, PAGE_SIZE, "%lu\n", ofbi->region->size);
}
static ssize_t store_size(struct device *dev, struct device_attribute *attr,
@@ -460,15 +455,15 @@
if (!lock_fb_info(fbi))
return -ENODEV;
- omapfb_lock(fbdev);
if (display && display->driver->sync)
display->driver->sync(display);
- mutex_lock(&fbi->mm_lock);
-
rg = ofbi->region;
+ down_write_nested(&rg->lock, rg->id);
+ atomic_inc(&rg->lock_count);
+
if (atomic_read(&rg->map_count)) {
r = -EBUSY;
goto out;
@@ -501,8 +496,9 @@
r = count;
out:
- mutex_unlock(&fbi->mm_lock);
- omapfb_unlock(fbdev);
+ atomic_dec(&rg->lock_count);
+ up_write(&rg->lock);
+
unlock_fb_info(fbi);
return r;
@@ -513,19 +509,8 @@
{
struct fb_info *fbi = dev_get_drvdata(dev);
struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
- int r;
- if (!lock_fb_info(fbi))
- return -ENODEV;
- omapfb_lock(fbdev);
-
- r = snprintf(buf, PAGE_SIZE, "%0x\n", ofbi->region->paddr);
-
- omapfb_unlock(fbdev);
- unlock_fb_info(fbi);
-
- return r;
+ return snprintf(buf, PAGE_SIZE, "%0x\n", ofbi->region->paddr);
}
static ssize_t show_virt(struct device *dev,
@@ -541,20 +526,11 @@
struct device_attribute *attr, char *buf)
{
struct fb_info *fbi = dev_get_drvdata(dev);
- struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
enum omapfb_update_mode mode;
int r;
- if (!lock_fb_info(fbi))
- return -ENODEV;
- omapfb_lock(fbdev);
-
r = omapfb_get_update_mode(fbi, &mode);
- omapfb_unlock(fbdev);
- unlock_fb_info(fbi);
-
if (r)
return r;
@@ -565,8 +541,6 @@
const char *buf, size_t count)
{
struct fb_info *fbi = dev_get_drvdata(dev);
- struct omapfb_info *ofbi = FB2OFB(fbi);
- struct omapfb2_device *fbdev = ofbi->fbdev;
unsigned mode;
int r;
@@ -574,17 +548,10 @@
if (r)
return r;
- if (!lock_fb_info(fbi))
- return -ENODEV;
- omapfb_lock(fbdev);
-
r = omapfb_set_update_mode(fbi, mode);
if (r)
return r;
- omapfb_unlock(fbdev);
- unlock_fb_info(fbi);
-
return count;
}