diff options
Diffstat (limited to 'drivers/char/drm/via_dma.c')
-rw-r--r-- | drivers/char/drm/via_dma.c | 111 |
1 files changed, 46 insertions, 65 deletions
diff --git a/drivers/char/drm/via_dma.c b/drivers/char/drm/via_dma.c index c0539c6299cf..13a9c5ca4593 100644 --- a/drivers/char/drm/via_dma.c +++ b/drivers/char/drm/via_dma.c @@ -252,7 +252,7 @@ static int via_dma_init(DRM_IOCTL_ARGS) break; case VIA_DMA_INITIALIZED: retcode = (dev_priv->ring.virtual_start != NULL) ? - 0 : DRM_ERR(EFAULT); + 0 : DRM_ERR(EFAULT); break; default: retcode = DRM_ERR(EINVAL); @@ -432,56 +432,34 @@ static int via_hook_segment(drm_via_private_t * dev_priv, { int paused, count; volatile uint32_t *paused_at = dev_priv->last_pause_ptr; + uint32_t reader,ptr; + paused = 0; via_flush_write_combine(); - while (!*(via_get_dma(dev_priv) - 1)) ; - *dev_priv->last_pause_ptr = pause_addr_lo; + (void) *(volatile uint32_t *)(via_get_dma(dev_priv) -1); + *paused_at = pause_addr_lo; via_flush_write_combine(); - - /* - * The below statement is inserted to really force the flush. - * Not sure it is needed. - */ - - while (!*dev_priv->last_pause_ptr) ; + (void) *paused_at; + reader = *(dev_priv->hw_addr_ptr); + ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) + + dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4; dev_priv->last_pause_ptr = via_get_dma(dev_priv) - 1; - while (!*dev_priv->last_pause_ptr) ; - paused = 0; - count = 20; - - while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--) ; - if ((count <= 8) && (count >= 0)) { - uint32_t rgtr, ptr; - rgtr = *(dev_priv->hw_addr_ptr); - ptr = ((volatile char *)dev_priv->last_pause_ptr - - dev_priv->dma_ptr) + dev_priv->dma_offset + - (uint32_t) dev_priv->agpAddr + 4 - CMDBUF_ALIGNMENT_SIZE; - if (rgtr <= ptr) { - DRM_ERROR - ("Command regulator\npaused at count %d, address %x, " - "while current pause address is %x.\n" - "Please mail this message to " - "<unichrome-devel@lists.sourceforge.net>\n", count, - rgtr, ptr); - } + if ((ptr - reader) <= dev_priv->dma_diff ) { + count = 10000000; + while (!(paused = (VIA_READ(0x41c) & 0x80000000)) && count--); } if (paused && !no_pci_fire) { - uint32_t rgtr, ptr; - uint32_t ptr_low; + reader = *(dev_priv->hw_addr_ptr); + if ((ptr - reader) == dev_priv->dma_diff) { - count = 1000000; - while ((VIA_READ(VIA_REG_STATUS) & VIA_CMD_RGTR_BUSY) - && count--) ; + /* + * There is a concern that these writes may stall the PCI bus + * if the GPU is not idle. However, idling the GPU first + * doesn't make a difference. + */ - rgtr = *(dev_priv->hw_addr_ptr); - ptr = ((volatile char *)paused_at - dev_priv->dma_ptr) + - dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4; - - ptr_low = (ptr > 3 * CMDBUF_ALIGNMENT_SIZE) ? - ptr - 3 * CMDBUF_ALIGNMENT_SIZE : 0; - if (rgtr <= ptr && rgtr >= ptr_low) { VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16)); VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_hi); VIA_WRITE(VIA_REG_TRANSPACE, pause_addr_lo); @@ -494,6 +472,9 @@ static int via_hook_segment(drm_via_private_t * dev_priv, static int via_wait_idle(drm_via_private_t * dev_priv) { int count = 10000000; + + while (!(VIA_READ(VIA_REG_STATUS) & VIA_VR_QUEUE_BUSY) && count--); + while (count-- && (VIA_READ(VIA_REG_STATUS) & (VIA_CMD_RGTR_BUSY | VIA_2D_ENG_BUSY | VIA_3D_ENG_BUSY))) ; @@ -537,6 +518,9 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv) uint32_t end_addr, end_addr_lo; uint32_t command; uint32_t agp_base; + uint32_t ptr; + uint32_t reader; + int count; dev_priv->dma_low = 0; @@ -554,7 +538,7 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv) &pause_addr_hi, &pause_addr_lo, 1) - 1; via_flush_write_combine(); - while (!*dev_priv->last_pause_ptr) ; + (void) *(volatile uint32_t *)dev_priv->last_pause_ptr; VIA_WRITE(VIA_REG_TRANSET, (HC_ParaType_PreCR << 16)); VIA_WRITE(VIA_REG_TRANSPACE, command); @@ -566,6 +550,24 @@ static void via_cmdbuf_start(drm_via_private_t * dev_priv) DRM_WRITEMEMORYBARRIER(); VIA_WRITE(VIA_REG_TRANSPACE, command | HC_HAGPCMNT_MASK); VIA_READ(VIA_REG_TRANSPACE); + + dev_priv->dma_diff = 0; + + count = 10000000; + while (!(VIA_READ(0x41c) & 0x80000000) && count--); + + reader = *(dev_priv->hw_addr_ptr); + ptr = ((volatile char *)dev_priv->last_pause_ptr - dev_priv->dma_ptr) + + dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr + 4; + + /* + * This is the difference between where we tell the + * command reader to pause and where it actually pauses. + * This differs between hw implementation so we need to + * detect it. + */ + + dev_priv->dma_diff = ptr - reader; } static void via_pad_cache(drm_via_private_t * dev_priv, int qwords) @@ -592,7 +594,6 @@ static void via_cmdbuf_jump(drm_via_private_t * dev_priv) uint32_t pause_addr_lo, pause_addr_hi; uint32_t jump_addr_lo, jump_addr_hi; volatile uint32_t *last_pause_ptr; - uint32_t dma_low_save1, dma_low_save2; agp_base = dev_priv->dma_offset + (uint32_t) dev_priv->agpAddr; via_align_cmd(dev_priv, HC_HAGPBpID_JUMP, 0, &jump_addr_hi, @@ -619,31 +620,11 @@ static void via_cmdbuf_jump(drm_via_private_t * dev_priv) &pause_addr_lo, 0); *last_pause_ptr = pause_addr_lo; - dma_low_save1 = dev_priv->dma_low; - - /* - * Now, set a trap that will pause the regulator if it tries to rerun the old - * command buffer. (Which may happen if via_hook_segment detecs a command regulator pause - * and reissues the jump command over PCI, while the regulator has already taken the jump - * and actually paused at the current buffer end). - * There appears to be no other way to detect this condition, since the hw_addr_pointer - * does not seem to get updated immediately when a jump occurs. - */ - last_pause_ptr = - via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi, - &pause_addr_lo, 0) - 1; - via_align_cmd(dev_priv, HC_HAGPBpID_PAUSE, 0, &pause_addr_hi, - &pause_addr_lo, 0); - *last_pause_ptr = pause_addr_lo; - - dma_low_save2 = dev_priv->dma_low; - dev_priv->dma_low = dma_low_save1; - via_hook_segment(dev_priv, jump_addr_hi, jump_addr_lo, 0); - dev_priv->dma_low = dma_low_save2; - via_hook_segment(dev_priv, pause_addr_hi, pause_addr_lo, 0); + via_hook_segment( dev_priv, jump_addr_hi, jump_addr_lo, 0); } + static void via_cmdbuf_rewind(drm_via_private_t * dev_priv) { via_cmdbuf_jump(dev_priv); |