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mesa-drm/shared-core/i915_irq.c
Keith Packard d434b64f6a [i915] leave interrupts masked off when not in use. 
The interrupt enable register cannot be used to temporarily disable
interrupts, instead use the interrupt mask register.

Note that this change means that a pile of buffers will be left stuck on the
chip as the final interrupts will not be recognized to come and drain things.
2008-05-26 03:25:16 -07:00

1017 lines
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/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
*/
/*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#define MAX_NOPID ((u32)~0)
/**
* i915_get_pipe - return the the pipe associated with a given plane
* @dev: DRM device
* @plane: plane to look for
*
* The Intel Mesa & 2D drivers call the vblank routines with a plane number
* rather than a pipe number, since they may not always be equal. This routine
* maps the given @plane back to a pipe number.
*/
static int
i915_get_pipe(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 dspcntr;
dspcntr = plane ? I915_READ(DSPBCNTR) : I915_READ(DSPACNTR);
return dspcntr & DISPPLANE_SEL_PIPE_MASK ? 1 : 0;
}
/**
* i915_get_plane - return the the plane associated with a given pipe
* @dev: DRM device
* @pipe: pipe to look for
*
* The Intel Mesa & 2D drivers call the vblank routines with a plane number
* rather than a plane number, since they may not always be equal. This routine
* maps the given @pipe back to a plane number.
*/
static int
i915_get_plane(struct drm_device *dev, int pipe)
{
if (i915_get_pipe(dev, 0) == pipe)
return 0;
return 1;
}
/**
* i915_pipe_enabled - check if a pipe is enabled
* @dev: DRM device
* @pipe: pipe to check
*
* Reading certain registers when the pipe is disabled can hang the chip.
* Use this routine to make sure the PLL is running and the pipe is active
* before reading such registers if unsure.
*/
static int
i915_pipe_enabled(struct drm_device *dev, int pipe)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
return 1;
return 0;
}
/**
* Emit a synchronous flip.
*
* This function must be called with the drawable spinlock held.
*/
static void
i915_dispatch_vsync_flip(struct drm_device *dev, struct drm_drawable_info *drw,
int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
u16 x1, y1, x2, y2;
int pf_planes = 1 << plane;
DRM_SPINLOCK_ASSERT(&dev->drw_lock);
/* If the window is visible on the other plane, we have to flip on that
* plane as well.
*/
if (plane == 1) {
x1 = sarea_priv->planeA_x;
y1 = sarea_priv->planeA_y;
x2 = x1 + sarea_priv->planeA_w;
y2 = y1 + sarea_priv->planeA_h;
} else {
x1 = sarea_priv->planeB_x;
y1 = sarea_priv->planeB_y;
x2 = x1 + sarea_priv->planeB_w;
y2 = y1 + sarea_priv->planeB_h;
}
if (x2 > 0 && y2 > 0) {
int i, num_rects = drw->num_rects;
struct drm_clip_rect *rect = drw->rects;
for (i = 0; i < num_rects; i++)
if (!(rect[i].x1 >= x2 || rect[i].y1 >= y2 ||
rect[i].x2 <= x1 || rect[i].y2 <= y1)) {
pf_planes = 0x3;
break;
}
}
i915_dispatch_flip(dev, pf_planes, 1);
}
/**
* Emit blits for scheduled buffer swaps.
*
* This function will be called with the HW lock held.
*/
static void i915_vblank_tasklet(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
struct list_head *list, *tmp, hits, *hit;
int nhits, nrects, slice[2], upper[2], lower[2], i, num_pages;
unsigned counter[2];
struct drm_drawable_info *drw;
drm_i915_sarea_t *sarea_priv = dev_priv->sarea_priv;
u32 cpp = dev_priv->cpp, offsets[3];
u32 cmd = (cpp == 4) ? (XY_SRC_COPY_BLT_CMD |
XY_SRC_COPY_BLT_WRITE_ALPHA |
XY_SRC_COPY_BLT_WRITE_RGB)
: XY_SRC_COPY_BLT_CMD;
u32 src_pitch = sarea_priv->pitch * cpp;
u32 dst_pitch = sarea_priv->pitch * cpp;
/* COPY rop (0xcc), map cpp to magic color depth constants */
u32 ropcpp = (0xcc << 16) | ((cpp - 1) << 24);
RING_LOCALS;
if (sarea_priv->front_tiled) {
cmd |= XY_SRC_COPY_BLT_DST_TILED;
dst_pitch >>= 2;
}
if (sarea_priv->back_tiled) {
cmd |= XY_SRC_COPY_BLT_SRC_TILED;
src_pitch >>= 2;
}
counter[0] = drm_vblank_count(dev, 0);
counter[1] = drm_vblank_count(dev, 1);
DRM_DEBUG("\n");
INIT_LIST_HEAD(&hits);
nhits = nrects = 0;
/* No irqsave/restore necessary. This tasklet may be run in an
* interrupt context or normal context, but we don't have to worry
* about getting interrupted by something acquiring the lock, because
* we are the interrupt context thing that acquires the lock.
*/
DRM_SPINLOCK(&dev_priv->swaps_lock);
/* Find buffer swaps scheduled for this vertical blank */
list_for_each_safe(list, tmp, &dev_priv->vbl_swaps.head) {
drm_i915_vbl_swap_t *vbl_swap =
list_entry(list, drm_i915_vbl_swap_t, head);
int pipe = i915_get_pipe(dev, vbl_swap->plane);
if ((counter[pipe] - vbl_swap->sequence) > (1<<23))
continue;
list_del(list);
dev_priv->swaps_pending--;
drm_vblank_put(dev, pipe);
DRM_SPINUNLOCK(&dev_priv->swaps_lock);
DRM_SPINLOCK(&dev->drw_lock);
drw = drm_get_drawable_info(dev, vbl_swap->drw_id);
if (!drw) {
DRM_SPINUNLOCK(&dev->drw_lock);
drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
DRM_SPINLOCK(&dev_priv->swaps_lock);
continue;
}
list_for_each(hit, &hits) {
drm_i915_vbl_swap_t *swap_cmp =
list_entry(hit, drm_i915_vbl_swap_t, head);
struct drm_drawable_info *drw_cmp =
drm_get_drawable_info(dev, swap_cmp->drw_id);
if (drw_cmp &&
drw_cmp->rects[0].y1 > drw->rects[0].y1) {
list_add_tail(list, hit);
break;
}
}
DRM_SPINUNLOCK(&dev->drw_lock);
/* List of hits was empty, or we reached the end of it */
if (hit == &hits)
list_add_tail(list, hits.prev);
nhits++;
DRM_SPINLOCK(&dev_priv->swaps_lock);
}
DRM_SPINUNLOCK(&dev_priv->swaps_lock);
if (nhits == 0) {
return;
}
i915_kernel_lost_context(dev);
upper[0] = upper[1] = 0;
slice[0] = max(sarea_priv->planeA_h / nhits, 1);
slice[1] = max(sarea_priv->planeB_h / nhits, 1);
lower[0] = sarea_priv->planeA_y + slice[0];
lower[1] = sarea_priv->planeB_y + slice[0];
offsets[0] = sarea_priv->front_offset;
offsets[1] = sarea_priv->back_offset;
offsets[2] = sarea_priv->third_offset;
num_pages = sarea_priv->third_handle ? 3 : 2;
DRM_SPINLOCK(&dev->drw_lock);
/* Emit blits for buffer swaps, partitioning both outputs into as many
* slices as there are buffer swaps scheduled in order to avoid tearing
* (based on the assumption that a single buffer swap would always
* complete before scanout starts).
*/
for (i = 0; i++ < nhits;
upper[0] = lower[0], lower[0] += slice[0],
upper[1] = lower[1], lower[1] += slice[1]) {
int init_drawrect = 1;
if (i == nhits)
lower[0] = lower[1] = sarea_priv->height;
list_for_each(hit, &hits) {
drm_i915_vbl_swap_t *swap_hit =
list_entry(hit, drm_i915_vbl_swap_t, head);
struct drm_clip_rect *rect;
int num_rects, plane, front, back;
unsigned short top, bottom;
drw = drm_get_drawable_info(dev, swap_hit->drw_id);
if (!drw)
continue;
plane = swap_hit->plane;
if (swap_hit->flip) {
i915_dispatch_vsync_flip(dev, drw, plane);
continue;
}
if (init_drawrect) {
int width = sarea_priv->width;
int height = sarea_priv->height;
if (IS_I965G(dev)) {
BEGIN_LP_RING(4);
OUT_RING(GFX_OP_DRAWRECT_INFO_I965);
OUT_RING(0);
OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
OUT_RING(0);
ADVANCE_LP_RING();
} else {
BEGIN_LP_RING(6);
OUT_RING(GFX_OP_DRAWRECT_INFO);
OUT_RING(0);
OUT_RING(0);
OUT_RING(((width - 1) & 0xffff) | ((height - 1) << 16));
OUT_RING(0);
OUT_RING(0);
ADVANCE_LP_RING();
}
sarea_priv->ctxOwner = DRM_KERNEL_CONTEXT;
init_drawrect = 0;
}
rect = drw->rects;
top = upper[plane];
bottom = lower[plane];
front = (dev_priv->sarea_priv->pf_current_page >>
(2 * plane)) & 0x3;
back = (front + 1) % num_pages;
for (num_rects = drw->num_rects; num_rects--; rect++) {
int y1 = max(rect->y1, top);
int y2 = min(rect->y2, bottom);
if (y1 >= y2)
continue;
BEGIN_LP_RING(8);
OUT_RING(cmd);
OUT_RING(ropcpp | dst_pitch);
OUT_RING((y1 << 16) | rect->x1);
OUT_RING((y2 << 16) | rect->x2);
OUT_RING(offsets[front]);
OUT_RING((y1 << 16) | rect->x1);
OUT_RING(src_pitch);
OUT_RING(offsets[back]);
ADVANCE_LP_RING();
}
}
}
DRM_SPINUNLOCK(&dev->drw_lock);
list_for_each_safe(hit, tmp, &hits) {
drm_i915_vbl_swap_t *swap_hit =
list_entry(hit, drm_i915_vbl_swap_t, head);
list_del(hit);
drm_free(swap_hit, sizeof(*swap_hit), DRM_MEM_DRIVER);
}
}
#if 0
static int i915_in_vblank(struct drm_device *dev, int pipe)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long pipedsl, vblank, vtotal;
unsigned long vbl_start, vbl_end, cur_line;
pipedsl = pipe ? PIPEBDSL : PIPEADSL;
vblank = pipe ? VBLANK_B : VBLANK_A;
vtotal = pipe ? VTOTAL_B : VTOTAL_A;
vbl_start = I915_READ(vblank) & VBLANK_START_MASK;
vbl_end = (I915_READ(vblank) >> VBLANK_END_SHIFT) & VBLANK_END_MASK;
cur_line = I915_READ(pipedsl);
if (cur_line >= vbl_start)
return 1;
return 0;
}
#endif
u32 i915_get_vblank_counter(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
unsigned long high_frame;
unsigned long low_frame;
u32 high1, high2, low, count;
int pipe;
pipe = i915_get_pipe(dev, plane);
high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
if (!i915_pipe_enabled(dev, pipe)) {
printk(KERN_ERR "trying to get vblank count for disabled "
"pipe %d\n", pipe);
return 0;
}
/*
* High & low register fields aren't synchronized, so make sure
* we get a low value that's stable across two reads of the high
* register.
*/
do {
high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
PIPE_FRAME_HIGH_SHIFT);
low = ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
PIPE_FRAME_LOW_SHIFT);
high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
PIPE_FRAME_HIGH_SHIFT);
} while (high1 != high2);
count = (high1 << 8) | low;
/*
* If we're in the middle of the vblank period, the
* above regs won't have been updated yet, so return
* an incremented count to stay accurate
*/
#if 0
if (i915_in_vblank(dev, pipe))
count++;
#endif
/* count may be reset by other driver(e.g. 2D driver),
we have no way to know if it is wrapped or resetted
when count is zero. do a rough guess.
*/
if (count == 0 && dev->last_vblank[pipe] < dev->max_vblank_count/2)
dev->last_vblank[pipe] = 0;
return count;
}
/**
* Handler for user interrupts in process context (able to sleep, do VFS
* operations, etc.
*
* If another IRQ comes in while we're in this handler, it will still get put
* on the queue again to be rerun when we finish.
*/
void
i915_user_interrupt_handler(struct work_struct *work)
{
drm_i915_private_t *dev_priv;
struct drm_device *dev;
dev_priv = container_of(work, drm_i915_private_t,
user_interrupt_task);
dev = dev_priv->dev;
mutex_lock(&dev->struct_mutex);
i915_gem_retire_requests(dev);
mutex_unlock(&dev->struct_mutex);
}
irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
{
struct drm_device *dev = (struct drm_device *) arg;
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 iir;
u32 pipea_stats, pipeb_stats;
int vblank = 0;
iir = I915_READ(I915REG_INT_IDENTITY_R);
#if 0
DRM_DEBUG("flag=%08x\n", iir);
#endif
if (iir == 0) {
DRM_DEBUG ("iir 0x%08x im 0x%08x ie 0x%08x pipea 0x%08x pipeb 0x%08x\n",
iir,
I915_READ(I915REG_INT_MASK_R),
I915_READ(I915REG_INT_ENABLE_R),
I915_READ(I915REG_PIPEASTAT),
I915_READ(I915REG_PIPEBSTAT));
return IRQ_NONE;
}
/*
* Clear the PIPE(A|B)STAT regs before the IIR otherwise
* we may get extra interrupts.
*/
if (iir & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT) {
pipea_stats = I915_READ(I915REG_PIPEASTAT);
if (pipea_stats & (I915_START_VBLANK_INTERRUPT_STATUS|
I915_VBLANK_INTERRUPT_STATUS))
{
vblank++;
drm_handle_vblank(dev, i915_get_plane(dev, 0));
}
I915_WRITE(I915REG_PIPEASTAT, pipea_stats);
}
if (iir & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT) {
pipeb_stats = I915_READ(I915REG_PIPEBSTAT);
if (pipeb_stats & (I915_START_VBLANK_INTERRUPT_STATUS|
I915_VBLANK_INTERRUPT_STATUS))
{
vblank++;
drm_handle_vblank(dev, i915_get_plane(dev, 1));
}
I915_WRITE(I915REG_PIPEBSTAT, pipeb_stats);
}
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
I915_WRITE(I915REG_INT_IDENTITY_R, iir | I915_USER_INTERRUPT);
(void) I915_READ(I915REG_INT_IDENTITY_R); /* Flush posted write */
if (iir & I915_USER_INTERRUPT) {
DRM_WAKEUP(&dev_priv->irq_queue);
#ifdef I915_HAVE_FENCE
i915_fence_handler(dev);
schedule_work(&dev_priv->user_interrupt_task);
#endif
}
if (vblank) {
if (dev_priv->swaps_pending > 0)
drm_locked_tasklet(dev, i915_vblank_tasklet);
}
return IRQ_HANDLED;
}
int i915_emit_irq(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
RING_LOCALS;
i915_kernel_lost_context(dev);
DRM_DEBUG("\n");
i915_emit_breadcrumb(dev);
BEGIN_LP_RING(2);
OUT_RING(0);
OUT_RING(GFX_OP_USER_INTERRUPT);
ADVANCE_LP_RING();
return dev_priv->counter;
}
void i915_user_irq_on(drm_i915_private_t *dev_priv)
{
DRM_SPINLOCK(&dev_priv->user_irq_lock);
if (dev_priv->irq_enabled && (++dev_priv->user_irq_refcount == 1)){
dev_priv->irq_mask_reg &= ~I915_USER_INTERRUPT;
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
(void) I915_READ (I915REG_INT_ENABLE_R);
}
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
}
void i915_user_irq_off(drm_i915_private_t *dev_priv)
{
DRM_SPINLOCK(&dev_priv->user_irq_lock);
BUG_ON(dev_priv->user_irq_refcount <= 0);
if (dev_priv->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
dev_priv->irq_mask_reg |= I915_USER_INTERRUPT;
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
(void) I915_READ(I915REG_INT_MASK_R);
}
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
}
int i915_wait_irq(struct drm_device * dev, int irq_nr)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret = 0;
DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
READ_BREADCRUMB(dev_priv));
if (READ_BREADCRUMB(dev_priv) >= irq_nr)
return 0;
i915_user_irq_on(dev_priv);
DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
READ_BREADCRUMB(dev_priv) >= irq_nr);
i915_user_irq_off(dev_priv);
if (ret == -EBUSY) {
DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
}
if (dev_priv->sarea_priv)
dev_priv->sarea_priv->last_dispatch =
READ_BREADCRUMB(dev_priv);
return ret;
}
/* Needs the lock as it touches the ring.
*/
int i915_irq_emit(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_irq_emit_t *emit = data;
int result;
LOCK_TEST_WITH_RETURN(dev, file_priv);
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
result = i915_emit_irq(dev);
if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
DRM_ERROR("copy_to_user\n");
return -EFAULT;
}
return 0;
}
/* Doesn't need the hardware lock.
*/
int i915_irq_wait(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_irq_wait_t *irqwait = data;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
return i915_wait_irq(dev, irqwait->irq_seq);
}
int i915_enable_vblank(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int pipe = i915_get_pipe(dev, plane);
u32 pipestat_reg = 0;
u32 mask_reg = 0;
u32 pipestat;
switch (pipe) {
case 0:
pipestat_reg = I915REG_PIPEASTAT;
mask_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
break;
case 1:
pipestat_reg = I915REG_PIPEBSTAT;
mask_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
break;
default:
DRM_ERROR("tried to enable vblank on non-existent pipe %d\n",
pipe);
break;
}
if (pipestat_reg)
{
pipestat = I915_READ (pipestat_reg);
/*
* Older chips didn't have the start vblank interrupt,
* but
*/
if (IS_I965G (dev))
pipestat |= I915_START_VBLANK_INTERRUPT_ENABLE;
else
pipestat |= I915_VBLANK_INTERRUPT_ENABLE;
/*
* Clear any pending status
*/
pipestat |= (I915_START_VBLANK_INTERRUPT_STATUS |
I915_VBLANK_INTERRUPT_STATUS);
I915_WRITE(pipestat_reg, pipestat);
}
DRM_SPINLOCK(&dev_priv->user_irq_lock);
dev_priv->irq_mask_reg &= ~mask_reg;
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
I915_READ(I915REG_INT_MASK_R);
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
return 0;
}
void i915_disable_vblank(struct drm_device *dev, int plane)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int pipe = i915_get_pipe(dev, plane);
u32 pipestat_reg = 0;
u32 mask_reg = 0;
u32 pipestat;
switch (pipe) {
case 0:
pipestat_reg = I915REG_PIPEASTAT;
mask_reg |= I915_DISPLAY_PIPE_A_EVENT_INTERRUPT;
break;
case 1:
pipestat_reg = I915REG_PIPEBSTAT;
mask_reg |= I915_DISPLAY_PIPE_B_EVENT_INTERRUPT;
break;
default:
DRM_ERROR("tried to disable vblank on non-existent pipe %d\n",
pipe);
break;
}
DRM_SPINLOCK(&dev_priv->user_irq_lock);
dev_priv->irq_mask_reg |= mask_reg;
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
(void) I915_READ (I915REG_INT_MASK_R);
DRM_SPINUNLOCK(&dev_priv->user_irq_lock);
if (pipestat_reg)
{
pipestat = I915_READ (pipestat_reg);
pipestat &= ~(I915_START_VBLANK_INTERRUPT_ENABLE |
I915_VBLANK_INTERRUPT_ENABLE);
/*
* Clear any pending status
*/
pipestat |= (I915_START_VBLANK_INTERRUPT_STATUS |
I915_VBLANK_INTERRUPT_STATUS);
I915_WRITE(pipestat_reg, pipestat);
(void) I915_READ(pipestat_reg);
}
}
static void i915_enable_interrupt (struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
dev_priv->irq_mask_reg = (I915_USER_INTERRUPT |
I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
I915_DISPLAY_PIPE_B_EVENT_INTERRUPT);
I915_WRITE(I915REG_INT_MASK_R, dev_priv->irq_mask_reg);
I915_WRITE(I915REG_INT_ENABLE_R, dev_priv->irq_mask_reg);
(void) I915_READ (I915REG_INT_ENABLE_R);
dev_priv->irq_enabled = 1;
}
static void i915_disable_interrupt (struct drm_device *dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
I915_WRITE(I915REG_HWSTAM, 0xffffffff);
I915_WRITE(I915REG_INT_MASK_R, 0xffffffff);
I915_WRITE(I915REG_INT_ENABLE_R, 0);
I915_WRITE(I915REG_INT_IDENTITY_R, 0xffffffff);
(void) I915_READ (I915REG_INT_IDENTITY_R);
dev_priv->irq_enabled = 0;
}
/* Set the vblank monitor pipe
*/
int i915_vblank_pipe_set(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_vblank_pipe_t *pipe = data;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
if (pipe->pipe & ~(DRM_I915_VBLANK_PIPE_A|DRM_I915_VBLANK_PIPE_B)) {
DRM_ERROR("called with invalid pipe 0x%x\n", pipe->pipe);
return -EINVAL;
}
dev_priv->vblank_pipe = pipe->pipe;
return 0;
}
int i915_vblank_pipe_get(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_vblank_pipe_t *pipe = data;
u16 flag;
if (!dev_priv) {
DRM_ERROR("called with no initialization\n");
return -EINVAL;
}
flag = I915_READ(I915REG_INT_ENABLE_R);
pipe->pipe = 0;
if (flag & I915_DISPLAY_PIPE_A_EVENT_INTERRUPT)
pipe->pipe |= DRM_I915_VBLANK_PIPE_A;
if (flag & I915_DISPLAY_PIPE_B_EVENT_INTERRUPT)
pipe->pipe |= DRM_I915_VBLANK_PIPE_B;
return 0;
}
/**
* Schedule buffer swap at given vertical blank.
*/
int i915_vblank_swap(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_vblank_swap_t *swap = data;
drm_i915_vbl_swap_t *vbl_swap;
unsigned int pipe, seqtype, curseq, plane;
unsigned long irqflags;
struct list_head *list;
int ret;
if (!dev_priv) {
DRM_ERROR("%s called with no initialization\n", __func__);
return -EINVAL;
}
if (!dev_priv->sarea_priv || dev_priv->sarea_priv->rotation) {
DRM_DEBUG("Rotation not supported\n");
return -EINVAL;
}
if (swap->seqtype & ~(_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE |
_DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS |
_DRM_VBLANK_FLIP)) {
DRM_ERROR("Invalid sequence type 0x%x\n", swap->seqtype);
return -EINVAL;
}
plane = (swap->seqtype & _DRM_VBLANK_SECONDARY) ? 1 : 0;
pipe = i915_get_pipe(dev, plane);
seqtype = swap->seqtype & (_DRM_VBLANK_RELATIVE | _DRM_VBLANK_ABSOLUTE);
if (!(dev_priv->vblank_pipe & (1 << pipe))) {
DRM_ERROR("Invalid pipe %d\n", pipe);
return -EINVAL;
}
DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);
/* It makes no sense to schedule a swap for a drawable that doesn't have
* valid information at this point. E.g. this could mean that the X
* server is too old to push drawable information to the DRM, in which
* case all such swaps would become ineffective.
*/
if (!drm_get_drawable_info(dev, swap->drawable)) {
DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
DRM_DEBUG("Invalid drawable ID %d\n", swap->drawable);
return -EINVAL;
}
DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
drm_update_vblank_count(dev, pipe);
curseq = drm_vblank_count(dev, pipe);
if (seqtype == _DRM_VBLANK_RELATIVE)
swap->sequence += curseq;
if ((curseq - swap->sequence) <= (1<<23)) {
if (swap->seqtype & _DRM_VBLANK_NEXTONMISS) {
swap->sequence = curseq + 1;
} else {
DRM_DEBUG("Missed target sequence\n");
return -EINVAL;
}
}
if (swap->seqtype & _DRM_VBLANK_FLIP) {
swap->sequence--;
if ((curseq - swap->sequence) <= (1<<23)) {
struct drm_drawable_info *drw;
LOCK_TEST_WITH_RETURN(dev, file_priv);
DRM_SPINLOCK_IRQSAVE(&dev->drw_lock, irqflags);
drw = drm_get_drawable_info(dev, swap->drawable);
if (!drw) {
DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock,
irqflags);
DRM_DEBUG("Invalid drawable ID %d\n",
swap->drawable);
return -EINVAL;
}
i915_dispatch_vsync_flip(dev, drw, plane);
DRM_SPINUNLOCK_IRQRESTORE(&dev->drw_lock, irqflags);
return 0;
}
}
DRM_SPINLOCK_IRQSAVE(&dev_priv->swaps_lock, irqflags);
list_for_each(list, &dev_priv->vbl_swaps.head) {
vbl_swap = list_entry(list, drm_i915_vbl_swap_t, head);
if (vbl_swap->drw_id == swap->drawable &&
vbl_swap->plane == plane &&
vbl_swap->sequence == swap->sequence) {
vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
DRM_DEBUG("Already scheduled\n");
return 0;
}
}
DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
if (dev_priv->swaps_pending >= 100) {
DRM_DEBUG("Too many swaps queued\n");
return -EBUSY;
}
vbl_swap = drm_calloc(1, sizeof(*vbl_swap), DRM_MEM_DRIVER);
if (!vbl_swap) {
DRM_ERROR("Failed to allocate memory to queue swap\n");
return -ENOMEM;
}
DRM_DEBUG("\n");
ret = drm_vblank_get(dev, pipe);
if (ret) {
drm_free(vbl_swap, sizeof(*vbl_swap), DRM_MEM_DRIVER);
return ret;
}
vbl_swap->drw_id = swap->drawable;
vbl_swap->plane = plane;
vbl_swap->sequence = swap->sequence;
vbl_swap->flip = (swap->seqtype & _DRM_VBLANK_FLIP);
if (vbl_swap->flip)
swap->sequence++;
DRM_SPINLOCK_IRQSAVE(&dev_priv->swaps_lock, irqflags);
list_add_tail(&vbl_swap->head, &dev_priv->vbl_swaps.head);
dev_priv->swaps_pending++;
DRM_SPINUNLOCK_IRQRESTORE(&dev_priv->swaps_lock, irqflags);
return 0;
}
/* drm_dma.h hooks
*/
void i915_driver_irq_preinstall(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
I915_WRITE(I915REG_HWSTAM, 0xffff);
I915_WRITE(I915REG_INT_ENABLE_R, 0x0);
I915_WRITE(I915REG_INT_MASK_R, 0xffffffff);
I915_WRITE(I915REG_INT_IDENTITY_R, 0xffffffff);
(void) I915_READ(I915REG_INT_IDENTITY_R);
}
int i915_driver_irq_postinstall(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
int ret, num_pipes = 2;
DRM_SPININIT(&dev_priv->swaps_lock, "swap");
INIT_LIST_HEAD(&dev_priv->vbl_swaps.head);
dev_priv->swaps_pending = 0;
DRM_SPININIT(&dev_priv->user_irq_lock, "userirq");
dev_priv->user_irq_refcount = 0;
dev_priv->irq_mask_reg = 0;
ret = drm_vblank_init(dev, num_pipes);
if (ret)
return ret;
dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */
i915_enable_interrupt(dev);
DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
/*
* Initialize the hardware status page IRQ location.
*/
I915_WRITE(I915REG_INSTPM, (1 << 5) | (1 << 21));
return 0;
}
void i915_driver_irq_uninstall(struct drm_device * dev)
{
drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
u32 temp;
if (!dev_priv)
return;
i915_disable_interrupt (dev);
temp = I915_READ(I915REG_PIPEASTAT);
I915_WRITE(I915REG_PIPEASTAT, temp);
temp = I915_READ(I915REG_PIPEBSTAT);
I915_WRITE(I915REG_PIPEBSTAT, temp);
}
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