diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 849 |
1 files changed, 849 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c new file mode 100644 index 0000000..cea4f1a --- /dev/null +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -0,0 +1,849 @@ +/* + * Copyright © 2008-2010 Intel Corporation + * + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS 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. + * + * Authors: + * Eric Anholt <eric@anholt.net> + * Zou Nan hai <nanhai.zou@intel.com> + * Xiang Hai hao<haihao.xiang@intel.com> + * + */ + +#include "drmP.h" +#include "drm.h" +#include "i915_drv.h" +#include "i915_drm.h" +#include "i915_trace.h" + +static void +render_ring_flush(struct drm_device *dev, + struct intel_ring_buffer *ring, + u32 invalidate_domains, + u32 flush_domains) +{ +#if WATCH_EXEC + DRM_INFO("%s: invalidate %08x flush %08x\n", __func__, + invalidate_domains, flush_domains); +#endif + u32 cmd; + trace_i915_gem_request_flush(dev, ring->next_seqno, + invalidate_domains, flush_domains); + + if ((invalidate_domains | flush_domains) & I915_GEM_GPU_DOMAINS) { + /* + * read/write caches: + * + * I915_GEM_DOMAIN_RENDER is always invalidated, but is + * only flushed if MI_NO_WRITE_FLUSH is unset. On 965, it is + * also flushed at 2d versus 3d pipeline switches. + * + * read-only caches: + * + * I915_GEM_DOMAIN_SAMPLER is flushed on pre-965 if + * MI_READ_FLUSH is set, and is always flushed on 965. + * + * I915_GEM_DOMAIN_COMMAND may not exist? + * + * I915_GEM_DOMAIN_INSTRUCTION, which exists on 965, is + * invalidated when MI_EXE_FLUSH is set. + * + * I915_GEM_DOMAIN_VERTEX, which exists on 965, is + * invalidated with every MI_FLUSH. + * + * TLBs: + * + * On 965, TLBs associated with I915_GEM_DOMAIN_COMMAND + * and I915_GEM_DOMAIN_CPU in are invalidated at PTE write and + * I915_GEM_DOMAIN_RENDER and I915_GEM_DOMAIN_SAMPLER + * are flushed at any MI_FLUSH. + */ + + cmd = MI_FLUSH | MI_NO_WRITE_FLUSH; + if ((invalidate_domains|flush_domains) & + I915_GEM_DOMAIN_RENDER) + cmd &= ~MI_NO_WRITE_FLUSH; + if (!IS_I965G(dev)) { + /* + * On the 965, the sampler cache always gets flushed + * and this bit is reserved. + */ + if (invalidate_domains & I915_GEM_DOMAIN_SAMPLER) + cmd |= MI_READ_FLUSH; + } + if (invalidate_domains & I915_GEM_DOMAIN_INSTRUCTION) + cmd |= MI_EXE_FLUSH; + +#if WATCH_EXEC + DRM_INFO("%s: queue flush %08x to ring\n", __func__, cmd); +#endif + intel_ring_begin(dev, ring, 8); + intel_ring_emit(dev, ring, cmd); + intel_ring_emit(dev, ring, MI_NOOP); + intel_ring_advance(dev, ring); + } +} + +static unsigned int render_ring_get_head(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + return I915_READ(PRB0_HEAD) & HEAD_ADDR; +} + +static unsigned int render_ring_get_tail(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + return I915_READ(PRB0_TAIL) & TAIL_ADDR; +} + +static unsigned int render_ring_get_active_head(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + u32 acthd_reg = IS_I965G(dev) ? ACTHD_I965 : ACTHD; + + return I915_READ(acthd_reg); +} + +static void render_ring_advance_ring(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + I915_WRITE(PRB0_TAIL, ring->tail); +} + +static int init_ring_common(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + u32 head; + drm_i915_private_t *dev_priv = dev->dev_private; + struct drm_i915_gem_object *obj_priv; + obj_priv = to_intel_bo(ring->gem_object); + + /* Stop the ring if it's running. */ + I915_WRITE(ring->regs.ctl, 0); + I915_WRITE(ring->regs.head, 0); + I915_WRITE(ring->regs.tail, 0); + + /* Initialize the ring. */ + I915_WRITE(ring->regs.start, obj_priv->gtt_offset); + head = ring->get_head(dev, ring); + + /* G45 ring initialization fails to reset head to zero */ + if (head != 0) { + DRM_ERROR("%s head not reset to zero " + "ctl %08x head %08x tail %08x start %08x\n", + ring->name, + I915_READ(ring->regs.ctl), + I915_READ(ring->regs.head), + I915_READ(ring->regs.tail), + I915_READ(ring->regs.start)); + + I915_WRITE(ring->regs.head, 0); + + DRM_ERROR("%s head forced to zero " + "ctl %08x head %08x tail %08x start %08x\n", + ring->name, + I915_READ(ring->regs.ctl), + I915_READ(ring->regs.head), + I915_READ(ring->regs.tail), + I915_READ(ring->regs.start)); + } + + I915_WRITE(ring->regs.ctl, + ((ring->gem_object->size - PAGE_SIZE) & RING_NR_PAGES) + | RING_NO_REPORT | RING_VALID); + + head = I915_READ(ring->regs.head) & HEAD_ADDR; + /* If the head is still not zero, the ring is dead */ + if (head != 0) { + DRM_ERROR("%s initialization failed " + "ctl %08x head %08x tail %08x start %08x\n", + ring->name, + I915_READ(ring->regs.ctl), + I915_READ(ring->regs.head), + I915_READ(ring->regs.tail), + I915_READ(ring->regs.start)); + return -EIO; + } + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + i915_kernel_lost_context(dev); + else { + ring->head = ring->get_head(dev, ring); + ring->tail = ring->get_tail(dev, ring); + ring->space = ring->head - (ring->tail + 8); + if (ring->space < 0) + ring->space += ring->size; + } + return 0; +} + +static int init_render_ring(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + int ret = init_ring_common(dev, ring); + if (IS_I9XX(dev) && !IS_GEN3(dev)) { + I915_WRITE(MI_MODE, + (VS_TIMER_DISPATCH) << 16 | VS_TIMER_DISPATCH); + } + return ret; +} + +#define PIPE_CONTROL_FLUSH(addr) \ +do { \ + OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | \ + PIPE_CONTROL_DEPTH_STALL | 2); \ + OUT_RING(addr | PIPE_CONTROL_GLOBAL_GTT); \ + OUT_RING(0); \ + OUT_RING(0); \ +} while (0) + +/** + * Creates a new sequence number, emitting a write of it to the status page + * plus an interrupt, which will trigger i915_user_interrupt_handler. + * + * Must be called with struct_lock held. + * + * Returned sequence numbers are nonzero on success. + */ +static u32 +render_ring_add_request(struct drm_device *dev, + struct intel_ring_buffer *ring, + struct drm_file *file_priv, + u32 flush_domains) +{ + u32 seqno; + drm_i915_private_t *dev_priv = dev->dev_private; + seqno = intel_ring_get_seqno(dev, ring); + + if (IS_GEN6(dev)) { + BEGIN_LP_RING(6); + OUT_RING(GFX_OP_PIPE_CONTROL | 3); + OUT_RING(PIPE_CONTROL_QW_WRITE | + PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_IS_FLUSH | + PIPE_CONTROL_NOTIFY); + OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT); + OUT_RING(seqno); + OUT_RING(0); + OUT_RING(0); + ADVANCE_LP_RING(); + } else if (HAS_PIPE_CONTROL(dev)) { + u32 scratch_addr = dev_priv->seqno_gfx_addr + 128; + + /* + * Workaround qword write incoherence by flushing the + * PIPE_NOTIFY buffers out to memory before requesting + * an interrupt. + */ + BEGIN_LP_RING(32); + OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | + PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH); + OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT); + OUT_RING(seqno); + OUT_RING(0); + PIPE_CONTROL_FLUSH(scratch_addr); + scratch_addr += 128; /* write to separate cachelines */ + PIPE_CONTROL_FLUSH(scratch_addr); + scratch_addr += 128; + PIPE_CONTROL_FLUSH(scratch_addr); + scratch_addr += 128; + PIPE_CONTROL_FLUSH(scratch_addr); + scratch_addr += 128; + PIPE_CONTROL_FLUSH(scratch_addr); + scratch_addr += 128; + PIPE_CONTROL_FLUSH(scratch_addr); + OUT_RING(GFX_OP_PIPE_CONTROL | PIPE_CONTROL_QW_WRITE | + PIPE_CONTROL_WC_FLUSH | PIPE_CONTROL_TC_FLUSH | + PIPE_CONTROL_NOTIFY); + OUT_RING(dev_priv->seqno_gfx_addr | PIPE_CONTROL_GLOBAL_GTT); + OUT_RING(seqno); + OUT_RING(0); + ADVANCE_LP_RING(); + } else { + BEGIN_LP_RING(4); + OUT_RING(MI_STORE_DWORD_INDEX); + OUT_RING(I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT); + OUT_RING(seqno); + + OUT_RING(MI_USER_INTERRUPT); + ADVANCE_LP_RING(); + } + return seqno; +} + +static u32 +render_ring_get_gem_seqno(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; + if (HAS_PIPE_CONTROL(dev)) + return ((volatile u32 *)(dev_priv->seqno_page))[0]; + else + return intel_read_status_page(ring, I915_GEM_HWS_INDEX); +} + +static void +render_ring_get_user_irq(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags); + if (dev->irq_enabled && (++ring->user_irq_refcount == 1)) { + if (HAS_PCH_SPLIT(dev)) + ironlake_enable_graphics_irq(dev_priv, GT_PIPE_NOTIFY); + else + i915_enable_irq(dev_priv, I915_USER_INTERRUPT); + } + spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags); +} + +static void +render_ring_put_user_irq(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private; + unsigned long irqflags; + + spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags); + BUG_ON(dev->irq_enabled && ring->user_irq_refcount <= 0); + if (dev->irq_enabled && (--ring->user_irq_refcount == 0)) { + if (HAS_PCH_SPLIT(dev)) + ironlake_disable_graphics_irq(dev_priv, GT_PIPE_NOTIFY); + else + i915_disable_irq(dev_priv, I915_USER_INTERRUPT); + } + spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags); +} + +static void render_setup_status_page(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + if (IS_GEN6(dev)) { + I915_WRITE(HWS_PGA_GEN6, ring->status_page.gfx_addr); + I915_READ(HWS_PGA_GEN6); /* posting read */ + } else { + I915_WRITE(HWS_PGA, ring->status_page.gfx_addr); + I915_READ(HWS_PGA); /* posting read */ + } + +} + +void +bsd_ring_flush(struct drm_device *dev, + struct intel_ring_buffer *ring, + u32 invalidate_domains, + u32 flush_domains) +{ + intel_ring_begin(dev, ring, 8); + intel_ring_emit(dev, ring, MI_FLUSH); + intel_ring_emit(dev, ring, MI_NOOP); + intel_ring_advance(dev, ring); +} + +static inline unsigned int bsd_ring_get_head(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + return I915_READ(BSD_RING_HEAD) & HEAD_ADDR; +} + +static inline unsigned int bsd_ring_get_tail(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + return I915_READ(BSD_RING_TAIL) & TAIL_ADDR; +} + +static inline unsigned int bsd_ring_get_active_head(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + return I915_READ(BSD_RING_ACTHD); +} + +static inline void bsd_ring_advance_ring(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + I915_WRITE(BSD_RING_TAIL, ring->tail); +} + +static int init_bsd_ring(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + return init_ring_common(dev, ring); +} + +static u32 +bsd_ring_add_request(struct drm_device *dev, + struct intel_ring_buffer *ring, + struct drm_file *file_priv, + u32 flush_domains) +{ + u32 seqno; + seqno = intel_ring_get_seqno(dev, ring); + intel_ring_begin(dev, ring, 4); + intel_ring_emit(dev, ring, MI_STORE_DWORD_INDEX); + intel_ring_emit(dev, ring, + I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT); + intel_ring_emit(dev, ring, seqno); + intel_ring_emit(dev, ring, MI_USER_INTERRUPT); + intel_ring_advance(dev, ring); + + DRM_DEBUG_DRIVER("%s %d\n", ring->name, seqno); + + return seqno; +} + +static void bsd_setup_status_page(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + I915_WRITE(BSD_HWS_PGA, ring->status_page.gfx_addr); + I915_READ(BSD_HWS_PGA); +} + +static void +bsd_ring_get_user_irq(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + /* do nothing */ +} +static void +bsd_ring_put_user_irq(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + /* do nothing */ +} + +static u32 +bsd_ring_get_gem_seqno(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + return intel_read_status_page(ring, I915_GEM_HWS_INDEX); +} + +static int +bsd_ring_dispatch_gem_execbuffer(struct drm_device *dev, + struct intel_ring_buffer *ring, + struct drm_i915_gem_execbuffer2 *exec, + struct drm_clip_rect *cliprects, + uint64_t exec_offset) +{ + uint32_t exec_start; + exec_start = (uint32_t) exec_offset + exec->batch_start_offset; + intel_ring_begin(dev, ring, 2); + intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START | + (2 << 6) | MI_BATCH_NON_SECURE_I965); + intel_ring_emit(dev, ring, exec_start); + intel_ring_advance(dev, ring); + return 0; +} + + +static int +render_ring_dispatch_gem_execbuffer(struct drm_device *dev, + struct intel_ring_buffer *ring, + struct drm_i915_gem_execbuffer2 *exec, + struct drm_clip_rect *cliprects, + uint64_t exec_offset) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + int nbox = exec->num_cliprects; + int i = 0, count; + uint32_t exec_start, exec_len; + exec_start = (uint32_t) exec_offset + exec->batch_start_offset; + exec_len = (uint32_t) exec->batch_len; + + trace_i915_gem_request_submit(dev, dev_priv->mm.next_gem_seqno + 1); + + count = nbox ? nbox : 1; + + for (i = 0; i < count; i++) { + if (i < nbox) { + int ret = i915_emit_box(dev, cliprects, i, + exec->DR1, exec->DR4); + if (ret) + return ret; + } + + if (IS_I830(dev) || IS_845G(dev)) { + intel_ring_begin(dev, ring, 4); + intel_ring_emit(dev, ring, MI_BATCH_BUFFER); + intel_ring_emit(dev, ring, + exec_start | MI_BATCH_NON_SECURE); + intel_ring_emit(dev, ring, exec_start + exec_len - 4); + intel_ring_emit(dev, ring, 0); + } else { + intel_ring_begin(dev, ring, 4); + if (IS_I965G(dev)) { + intel_ring_emit(dev, ring, + MI_BATCH_BUFFER_START | (2 << 6) + | MI_BATCH_NON_SECURE_I965); + intel_ring_emit(dev, ring, exec_start); + } else { + intel_ring_emit(dev, ring, MI_BATCH_BUFFER_START + | (2 << 6)); + intel_ring_emit(dev, ring, exec_start | + MI_BATCH_NON_SECURE); + } + } + intel_ring_advance(dev, ring); + } + + /* XXX breadcrumb */ + return 0; +} + +static void cleanup_status_page(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + struct drm_gem_object *obj; + struct drm_i915_gem_object *obj_priv; + + obj = ring->status_page.obj; + if (obj == NULL) + return; + obj_priv = to_intel_bo(obj); + + kunmap(obj_priv->pages[0]); + i915_gem_object_unpin(obj); + drm_gem_object_unreference(obj); + ring->status_page.obj = NULL; + + memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map)); +} + +static int init_status_page(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + drm_i915_private_t *dev_priv = dev->dev_private; + struct drm_gem_object *obj; + struct drm_i915_gem_object *obj_priv; + int ret; + + obj = i915_gem_alloc_object(dev, 4096); + if (obj == NULL) { + DRM_ERROR("Failed to allocate status page\n"); + ret = -ENOMEM; + goto err; + } + obj_priv = to_intel_bo(obj); + obj_priv->agp_type = AGP_USER_CACHED_MEMORY; + + ret = i915_gem_object_pin(obj, 4096); + if (ret != 0) { + goto err_unref; + } + + ring->status_page.gfx_addr = obj_priv->gtt_offset; + ring->status_page.page_addr = kmap(obj_priv->pages[0]); + if (ring->status_page.page_addr == NULL) { + memset(&dev_priv->hws_map, 0, sizeof(dev_priv->hws_map)); + goto err_unpin; + } + ring->status_page.obj = obj; + memset(ring->status_page.page_addr, 0, PAGE_SIZE); + + ring->setup_status_page(dev, ring); + DRM_DEBUG_DRIVER("%s hws offset: 0x%08x\n", + ring->name, ring->status_page.gfx_addr); + + return 0; + +err_unpin: + i915_gem_object_unpin(obj); +err_unref: + drm_gem_object_unreference(obj); +err: + return ret; +} + + +int intel_init_ring_buffer(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + int ret; + struct drm_i915_gem_object *obj_priv; + struct drm_gem_object *obj; + ring->dev = dev; + + if (I915_NEED_GFX_HWS(dev)) { + ret = init_status_page(dev, ring); + if (ret) + return ret; + } + + obj = i915_gem_alloc_object(dev, ring->size); + if (obj == NULL) { + DRM_ERROR("Failed to allocate ringbuffer\n"); + ret = -ENOMEM; + goto cleanup; + } + + ring->gem_object = obj; + + ret = i915_gem_object_pin(obj, ring->alignment); + if (ret != 0) { + drm_gem_object_unreference(obj); + goto cleanup; + } + + obj_priv = to_intel_bo(obj); + ring->map.size = ring->size; + ring->map.offset = dev->agp->base + obj_priv->gtt_offset; + ring->map.type = 0; + ring->map.flags = 0; + ring->map.mtrr = 0; + + drm_core_ioremap_wc(&ring->map, dev); + if (ring->map.handle == NULL) { + DRM_ERROR("Failed to map ringbuffer.\n"); + i915_gem_object_unpin(obj); + drm_gem_object_unreference(obj); + ret = -EINVAL; + goto cleanup; + } + + ring->virtual_start = ring->map.handle; + ret = ring->init(dev, ring); + if (ret != 0) { + intel_cleanup_ring_buffer(dev, ring); + return ret; + } + + if (!drm_core_check_feature(dev, DRIVER_MODESET)) + i915_kernel_lost_context(dev); + else { + ring->head = ring->get_head(dev, ring); + ring->tail = ring->get_tail(dev, ring); + ring->space = ring->head - (ring->tail + 8); + if (ring->space < 0) + ring->space += ring->size; + } + INIT_LIST_HEAD(&ring->active_list); + INIT_LIST_HEAD(&ring->request_list); + return ret; +cleanup: + cleanup_status_page(dev, ring); + return ret; +} + +void intel_cleanup_ring_buffer(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + if (ring->gem_object == NULL) + return; + + drm_core_ioremapfree(&ring->map, dev); + + i915_gem_object_unpin(ring->gem_object); + drm_gem_object_unreference(ring->gem_object); + ring->gem_object = NULL; + cleanup_status_page(dev, ring); +} + +int intel_wrap_ring_buffer(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + unsigned int *virt; + int rem; + rem = ring->size - ring->tail; + + if (ring->space < rem) { + int ret = intel_wait_ring_buffer(dev, ring, rem); + if (ret) + return ret; + } + + virt = (unsigned int *)(ring->virtual_start + ring->tail); + rem /= 4; + while (rem--) + *virt++ = MI_NOOP; + + ring->tail = 0; + + return 0; +} + +int intel_wait_ring_buffer(struct drm_device *dev, + struct intel_ring_buffer *ring, int n) +{ + unsigned long end; + + trace_i915_ring_wait_begin (dev); + end = jiffies + 3 * HZ; + do { + ring->head = ring->get_head(dev, ring); + ring->space = ring->head - (ring->tail + 8); + if (ring->space < 0) + ring->space += ring->size; + if (ring->space >= n) { + trace_i915_ring_wait_end (dev); + return 0; + } + + if (dev->primary->master) { + struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv; + if (master_priv->sarea_priv) + master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT; + } + + yield(); + } while (!time_after(jiffies, end)); + trace_i915_ring_wait_end (dev); + return -EBUSY; +} + +void intel_ring_begin(struct drm_device *dev, + struct intel_ring_buffer *ring, int n) +{ + if (unlikely(ring->tail + n > ring->size)) + intel_wrap_ring_buffer(dev, ring); + if (unlikely(ring->space < n)) + intel_wait_ring_buffer(dev, ring, n); +} + +void intel_ring_emit(struct drm_device *dev, + struct intel_ring_buffer *ring, unsigned int data) +{ + unsigned int *virt = ring->virtual_start + ring->tail; + *virt = data; + ring->tail += 4; + ring->tail &= ring->size - 1; + ring->space -= 4; +} + +void intel_ring_advance(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + ring->advance_ring(dev, ring); +} + +void intel_fill_struct(struct drm_device *dev, + struct intel_ring_buffer *ring, + void *data, + unsigned int len) +{ + unsigned int *virt = ring->virtual_start + ring->tail; + BUG_ON((len&~(4-1)) != 0); + intel_ring_begin(dev, ring, len); + memcpy(virt, data, len); + ring->tail += len; + ring->tail &= ring->size - 1; + ring->space -= len; + intel_ring_advance(dev, ring); +} + +u32 intel_ring_get_seqno(struct drm_device *dev, + struct intel_ring_buffer *ring) +{ + u32 seqno; + seqno = ring->next_seqno; + + /* reserve 0 for non-seqno */ + if (++ring->next_seqno == 0) + ring->next_seqno = 1; + return seqno; +} + +struct intel_ring_buffer render_ring = { + .name = "render ring", + .regs = { + .ctl = PRB0_CTL, + .head = PRB0_HEAD, + .tail = PRB0_TAIL, + .start = PRB0_START + }, + .ring_flag = I915_EXEC_RENDER, + .size = 32 * PAGE_SIZE, + .alignment = PAGE_SIZE, + .virtual_start = NULL, + .dev = NULL, + .gem_object = NULL, + .head = 0, + .tail = 0, + .space = 0, + .next_seqno = 1, + .user_irq_refcount = 0, + .irq_gem_seqno = 0, + .waiting_gem_seqno = 0, + .setup_status_page = render_setup_status_page, + .init = init_render_ring, + .get_head = render_ring_get_head, + .get_tail = render_ring_get_tail, + .get_active_head = render_ring_get_active_head, + .advance_ring = render_ring_advance_ring, + .flush = render_ring_flush, + .add_request = render_ring_add_request, + .get_gem_seqno = render_ring_get_gem_seqno, + .user_irq_get = render_ring_get_user_irq, + .user_irq_put = render_ring_put_user_irq, + .dispatch_gem_execbuffer = render_ring_dispatch_gem_execbuffer, + .status_page = {NULL, 0, NULL}, + .map = {0,} +}; + +/* ring buffer for bit-stream decoder */ + +struct intel_ring_buffer bsd_ring = { + .name = "bsd ring", + .regs = { + .ctl = BSD_RING_CTL, + .head = BSD_RING_HEAD, + .tail = BSD_RING_TAIL, + .start = BSD_RING_START + }, + .ring_flag = I915_EXEC_BSD, + .size = 32 * PAGE_SIZE, + .alignment = PAGE_SIZE, + .virtual_start = NULL, + .dev = NULL, + .gem_object = NULL, + .head = 0, + .tail = 0, + .space = 0, + .next_seqno = 1, + .user_irq_refcount = 0, + .irq_gem_seqno = 0, + .waiting_gem_seqno = 0, + .setup_status_page = bsd_setup_status_page, + .init = init_bsd_ring, + .get_head = bsd_ring_get_head, + .get_tail = bsd_ring_get_tail, + .get_active_head = bsd_ring_get_active_head, + .advance_ring = bsd_ring_advance_ring, + .flush = bsd_ring_flush, + .add_request = bsd_ring_add_request, + .get_gem_seqno = bsd_ring_get_gem_seqno, + .user_irq_get = bsd_ring_get_user_irq, + .user_irq_put = bsd_ring_put_user_irq, + .dispatch_gem_execbuffer = bsd_ring_dispatch_gem_execbuffer, + .status_page = {NULL, 0, NULL}, + .map = {0,} +}; 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