xref: /xsrc/external/mit/xf86-video-intel-old/dist/src/i830_accel.c

/**************************************************************************

Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
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/*
 * Authors:
 *   Keith Whitwell <keith@tungstengraphics.com>
 *
 */

/*
 * XXX So far, for GXxor this is about 40% of the speed of SW, but CPU
 * utilisation falls from 95% to < 5%.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <errno.h>

#include "xf86.h"
#include "i830.h"
#include "i810_reg.h"
#include "i830_debug.h"
#include "i830_ring.h"
#include "i915_drm.h"

unsigned long
intel_get_pixmap_offset(PixmapPtr pPix)
{
    ScreenPtr pScreen = pPix->drawable.pScreen;
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    I830Ptr pI830 = I830PTR(pScrn);

    return (unsigned long)pPix->devPrivate.ptr - (unsigned long)pI830->FbBase;
}

unsigned long
intel_get_pixmap_pitch(PixmapPtr pPix)
{
    return (unsigned long)pPix->devKind;
}

int
I830WaitLpRing(ScrnInfoPtr pScrn, int n, int timeout_millis)
{
   I830Ptr pI830 = I830PTR(pScrn);
   I830RingBuffer *ring = &pI830->ring;
   int iters = 0;
   unsigned int start = 0;
   unsigned int now = 0;
   int last_head = 0;
   unsigned int first = 0;

   /* If your system hasn't moved the head pointer in 2 seconds, I'm going to
    * call it crashed.
    */
   if (timeout_millis == 0)
      timeout_millis = 2000;

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL) {
      ErrorF("I830WaitLpRing %d\n", n);
      first = GetTimeInMillis();
   }

   while (ring->space < n) {
      ring->head = INREG(LP_RING + RING_HEAD) & I830_HEAD_MASK;
      ring->space = ring->head - (ring->tail + 8);

      if (ring->space < 0)
	 ring->space += ring->mem->size;

      iters++;
      now = GetTimeInMillis();
      if (start == 0 || now < start || ring->head != last_head) {
	 if (I810_DEBUG & DEBUG_VERBOSE_ACCEL)
	    if (now > start)
	       ErrorF("space: %d wanted %d\n", ring->space, n);
	 start = now;
	 last_head = ring->head;
      } else if (now - start > timeout_millis) {
	 ErrorF("Error in I830WaitLpRing(), timeout for %d seconds\n",
		timeout_millis/1000);
	 if (IS_I965G(pI830))
	     i965_dump_error_state(pScrn);
	 else
	     i830_dump_error_state(pScrn);
	 ErrorF("space: %d wanted %d\n", ring->space, n);
	 pI830->uxa_driver = NULL;
	 FatalError("lockup\n");
      }

      DELAY(10);
   }

   if (I810_DEBUG & DEBUG_VERBOSE_ACCEL) {
      now = GetTimeInMillis();
      if (now - first) {
	 ErrorF("Elapsed %u ms\n", now - first);
	 ErrorF("space: %d wanted %d\n", ring->space, n);
      }
   }

   return iters;
}

void
I830Sync(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);

   if (I810_DEBUG & (DEBUG_VERBOSE_ACCEL | DEBUG_VERBOSE_SYNC))
      ErrorF("I830Sync\n");

   if (!pScrn->vtSema || !pI830->batch_bo)
       return;

   I830EmitFlush(pScrn);

   intel_batch_flush(pScrn, TRUE);
   intel_batch_wait_last(pScrn);
}

void
I830EmitFlush(ScrnInfoPtr pScrn)
{
   I830Ptr pI830 = I830PTR(pScrn);
   int flags = MI_WRITE_DIRTY_STATE | MI_INVALIDATE_MAP_CACHE;

   if (IS_I965G(pI830))
      flags = 0;

   {
       BEGIN_BATCH(1);
       OUT_BATCH(MI_FLUSH | flags);
       ADVANCE_BATCH();
   }
}


#if (ALWAYS_SYNC || ALWAYS_FLUSH)
void
i830_debug_sync(ScrnInfoPtr scrn)
{
    if (ALWAYS_SYNC)
	I830Sync(scrn);
    else
	intel_batch_flush(scrn, FALSE);
}
#endif

/* The following function sets up the supported acceleration. Call it
 * from the FbInit() function in the SVGA driver, or before ScreenInit
 * in a monolithic server.
 */
Bool
I830AccelInit(ScreenPtr pScreen)
{
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    I830Ptr pI830 = I830PTR(pScrn);

    /* Limits are described in the BLT engine chapter under Graphics Data Size
     * Limitations, and the descriptions of SURFACE_STATE, 3DSTATE_BUFFER_INFO,
     * 3DSTATE_DRAWING_RECTANGLE, 3DSTATE_MAP_INFO, and 3DSTATE_MAP_INFO.
     *
     * i845 through i965 limits 2D rendering to 65536 lines and pitch of 32768.
     *
     * i965 limits 3D surface to (2*element size)-aligned offset if un-tiled.
     * i965 limits 3D surface to 4kB-aligned offset if tiled.
     * i965 limits 3D surfaces to w,h of ?,8192.
     * i965 limits 3D surface to pitch of 1B - 128kB.
     * i965 limits 3D surface pitch alignment to 1 or 2 times the element size.
     * i965 limits 3D surface pitch alignment to 512B if tiled.
     * i965 limits 3D destination drawing rect to w,h of 8192,8192.
     *
     * i915 limits 3D textures to 4B-aligned offset if un-tiled.
     * i915 limits 3D textures to ~4kB-aligned offset if tiled.
     * i915 limits 3D textures to width,height of 2048,2048.
     * i915 limits 3D textures to pitch of 16B - 8kB, in dwords.
     * i915 limits 3D destination to ~4kB-aligned offset if tiled.
     * i915 limits 3D destination to pitch of 16B - 8kB, in dwords, if un-tiled.
     * i915 limits 3D destination to pitch 64B-aligned if used with depth.
     * i915 limits 3D destination to pitch of 512B - 8kB, in tiles, if tiled.
     * i915 limits 3D destination to POT aligned pitch if tiled.
     * i915 limits 3D destination drawing rect to w,h of 2048,2048.
     *
     * i845 limits 3D textures to 4B-aligned offset if un-tiled.
     * i845 limits 3D textures to ~4kB-aligned offset if tiled.
     * i845 limits 3D textures to width,height of 2048,2048.
     * i845 limits 3D textures to pitch of 4B - 8kB, in dwords.
     * i845 limits 3D destination to 4B-aligned offset if un-tiled.
     * i845 limits 3D destination to ~4kB-aligned offset if tiled.
     * i845 limits 3D destination to pitch of 8B - 8kB, in dwords.
     * i845 limits 3D destination drawing rect to w,h of 2048,2048.
     *
     * For the tiled issues, the only tiled buffer we draw to should be
     * the front, which will have an appropriate pitch/offset already set up,
     * so UXA doesn't need to worry.
     */
    if (IS_I965G(pI830)) {
	pI830->accel_pixmap_offset_alignment = 4 * 2;
	pI830->accel_pixmap_pitch_alignment = 64;
	pI830->accel_max_x = 8192;
	pI830->accel_max_y = 8192;
    } else {
	pI830->accel_pixmap_offset_alignment = 4;
	pI830->accel_pixmap_pitch_alignment = 64;
	pI830->accel_max_x = 2048;
	pI830->accel_max_y = 2048;
    }

    return i830_uxa_init(pScreen);
}