[Intel-gfx] [PATCH 2/3] drm/i915: Extract i915_gem_fence.c
Daniel Vetter
daniel.vetter at ffwll.ch
Fri Jul 24 04:55:11 PDT 2015
No code changes, just moving all the fence related code into a
separate file (and avoiding a bunch of forward declarations while at
it).
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
drivers/gpu/drm/i915/Makefile | 1 +
drivers/gpu/drm/i915/i915_drv.h | 16 +-
drivers/gpu/drm/i915/i915_gem.c | 401 --------------------------------
drivers/gpu/drm/i915/i915_gem_fence.c | 422 ++++++++++++++++++++++++++++++++++
4 files changed, 432 insertions(+), 408 deletions(-)
create mode 100644 drivers/gpu/drm/i915/i915_gem_fence.c
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index bf91482e14a3..41fb8a9c5bef 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -25,6 +25,7 @@ i915-y += i915_cmd_parser.o \
i915_gem_dmabuf.o \
i915_gem_evict.o \
i915_gem_execbuffer.o \
+ i915_gem_fence.o \
i915_gem_gtt.o \
i915_gem.o \
i915_gem_render_state.o \
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 773883d54b28..4c34fb15d0df 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2858,11 +2858,6 @@ static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req,
int __must_check i915_gem_get_seqno(struct drm_device *dev, u32 *seqno);
int __must_check i915_gem_set_seqno(struct drm_device *dev, u32 seqno);
-int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj);
-int __must_check i915_gem_object_put_fence(struct drm_i915_gem_object *obj);
-
-bool i915_gem_object_pin_fence(struct drm_i915_gem_object *obj);
-void i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj);
struct drm_i915_gem_request *
i915_gem_find_active_request(struct intel_engine_cs *ring);
@@ -2960,8 +2955,6 @@ struct drm_gem_object *i915_gem_prime_import(struct drm_device *dev,
struct dma_buf *i915_gem_prime_export(struct drm_device *dev,
struct drm_gem_object *gem_obj, int flags);
-void i915_gem_restore_fences(struct drm_device *dev);
-
unsigned long
i915_gem_obj_ggtt_offset_view(struct drm_i915_gem_object *o,
const struct i915_ggtt_view *view);
@@ -3056,6 +3049,15 @@ i915_gem_object_ggtt_unpin(struct drm_i915_gem_object *obj)
i915_gem_object_ggtt_unpin_view(obj, &i915_ggtt_view_normal);
}
+/* i915_gem_fence.c */
+int __must_check i915_gem_object_get_fence(struct drm_i915_gem_object *obj);
+int __must_check i915_gem_object_put_fence(struct drm_i915_gem_object *obj);
+
+bool i915_gem_object_pin_fence(struct drm_i915_gem_object *obj);
+void i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj);
+
+void i915_gem_restore_fences(struct drm_device *dev);
+
/* i915_gem_context.c */
int __must_check i915_gem_context_init(struct drm_device *dev);
void i915_gem_context_fini(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 322bbefafbc3..5d685789b1f9 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -46,11 +46,6 @@ static void
i915_gem_object_retire__write(struct drm_i915_gem_object *obj);
static void
i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int ring);
-static void i915_gem_write_fence(struct drm_device *dev, int reg,
- struct drm_i915_gem_object *obj);
-static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
- struct drm_i915_fence_reg *fence,
- bool enable);
static bool cpu_cache_is_coherent(struct drm_device *dev,
enum i915_cache_level level)
@@ -66,18 +61,6 @@ static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
return obj->pin_display;
}
-static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
-{
- if (obj->tiling_mode)
- i915_gem_release_mmap(obj);
-
- /* As we do not have an associated fence register, we will force
- * a tiling change if we ever need to acquire one.
- */
- obj->fence_dirty = false;
- obj->fence_reg = I915_FENCE_REG_NONE;
-}
-
/* some bookkeeping */
static void i915_gem_info_add_obj(struct drm_i915_private *dev_priv,
size_t size)
@@ -2793,27 +2776,6 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
}
}
-void i915_gem_restore_fences(struct drm_device *dev)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- int i;
-
- for (i = 0; i < dev_priv->num_fence_regs; i++) {
- struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
-
- /*
- * Commit delayed tiling changes if we have an object still
- * attached to the fence, otherwise just clear the fence.
- */
- if (reg->obj) {
- i915_gem_object_update_fence(reg->obj, reg,
- reg->obj->tiling_mode);
- } else {
- i915_gem_write_fence(dev, i, NULL);
- }
- }
-}
-
void i915_gem_reset(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3340,343 +3302,6 @@ int i915_gpu_idle(struct drm_device *dev)
return 0;
}
-static void i965_write_fence_reg(struct drm_device *dev, int reg,
- struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- int fence_reg;
- int fence_pitch_shift;
-
- if (INTEL_INFO(dev)->gen >= 6) {
- fence_reg = FENCE_REG_SANDYBRIDGE_0;
- fence_pitch_shift = SANDYBRIDGE_FENCE_PITCH_SHIFT;
- } else {
- fence_reg = FENCE_REG_965_0;
- fence_pitch_shift = I965_FENCE_PITCH_SHIFT;
- }
-
- fence_reg += reg * 8;
-
- /* To w/a incoherency with non-atomic 64-bit register updates,
- * we split the 64-bit update into two 32-bit writes. In order
- * for a partial fence not to be evaluated between writes, we
- * precede the update with write to turn off the fence register,
- * and only enable the fence as the last step.
- *
- * For extra levels of paranoia, we make sure each step lands
- * before applying the next step.
- */
- I915_WRITE(fence_reg, 0);
- POSTING_READ(fence_reg);
-
- if (obj) {
- u32 size = i915_gem_obj_ggtt_size(obj);
- uint64_t val;
-
- /* Adjust fence size to match tiled area */
- if (obj->tiling_mode != I915_TILING_NONE) {
- uint32_t row_size = obj->stride *
- (obj->tiling_mode == I915_TILING_Y ? 32 : 8);
- size = (size / row_size) * row_size;
- }
-
- val = (uint64_t)((i915_gem_obj_ggtt_offset(obj) + size - 4096) &
- 0xfffff000) << 32;
- val |= i915_gem_obj_ggtt_offset(obj) & 0xfffff000;
- val |= (uint64_t)((obj->stride / 128) - 1) << fence_pitch_shift;
- if (obj->tiling_mode == I915_TILING_Y)
- val |= 1 << I965_FENCE_TILING_Y_SHIFT;
- val |= I965_FENCE_REG_VALID;
-
- I915_WRITE(fence_reg + 4, val >> 32);
- POSTING_READ(fence_reg + 4);
-
- I915_WRITE(fence_reg + 0, val);
- POSTING_READ(fence_reg);
- } else {
- I915_WRITE(fence_reg + 4, 0);
- POSTING_READ(fence_reg + 4);
- }
-}
-
-static void i915_write_fence_reg(struct drm_device *dev, int reg,
- struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- u32 val;
-
- if (obj) {
- u32 size = i915_gem_obj_ggtt_size(obj);
- int pitch_val;
- int tile_width;
-
- WARN((i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK) ||
- (size & -size) != size ||
- (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
- "object 0x%08lx [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
- i915_gem_obj_ggtt_offset(obj), obj->map_and_fenceable, size);
-
- if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
- tile_width = 128;
- else
- tile_width = 512;
-
- /* Note: pitch better be a power of two tile widths */
- pitch_val = obj->stride / tile_width;
- pitch_val = ffs(pitch_val) - 1;
-
- val = i915_gem_obj_ggtt_offset(obj);
- if (obj->tiling_mode == I915_TILING_Y)
- val |= 1 << I830_FENCE_TILING_Y_SHIFT;
- val |= I915_FENCE_SIZE_BITS(size);
- val |= pitch_val << I830_FENCE_PITCH_SHIFT;
- val |= I830_FENCE_REG_VALID;
- } else
- val = 0;
-
- if (reg < 8)
- reg = FENCE_REG_830_0 + reg * 4;
- else
- reg = FENCE_REG_945_8 + (reg - 8) * 4;
-
- I915_WRITE(reg, val);
- POSTING_READ(reg);
-}
-
-static void i830_write_fence_reg(struct drm_device *dev, int reg,
- struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- uint32_t val;
-
- if (obj) {
- u32 size = i915_gem_obj_ggtt_size(obj);
- uint32_t pitch_val;
-
- WARN((i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK) ||
- (size & -size) != size ||
- (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
- "object 0x%08lx not 512K or pot-size 0x%08x aligned\n",
- i915_gem_obj_ggtt_offset(obj), size);
-
- pitch_val = obj->stride / 128;
- pitch_val = ffs(pitch_val) - 1;
-
- val = i915_gem_obj_ggtt_offset(obj);
- if (obj->tiling_mode == I915_TILING_Y)
- val |= 1 << I830_FENCE_TILING_Y_SHIFT;
- val |= I830_FENCE_SIZE_BITS(size);
- val |= pitch_val << I830_FENCE_PITCH_SHIFT;
- val |= I830_FENCE_REG_VALID;
- } else
- val = 0;
-
- I915_WRITE(FENCE_REG_830_0 + reg * 4, val);
- POSTING_READ(FENCE_REG_830_0 + reg * 4);
-}
-
-inline static bool i915_gem_object_needs_mb(struct drm_i915_gem_object *obj)
-{
- return obj && obj->base.read_domains & I915_GEM_DOMAIN_GTT;
-}
-
-static void i915_gem_write_fence(struct drm_device *dev, int reg,
- struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
-
- /* Ensure that all CPU reads are completed before installing a fence
- * and all writes before removing the fence.
- */
- if (i915_gem_object_needs_mb(dev_priv->fence_regs[reg].obj))
- mb();
-
- WARN(obj && (!obj->stride || !obj->tiling_mode),
- "bogus fence setup with stride: 0x%x, tiling mode: %i\n",
- obj->stride, obj->tiling_mode);
-
- if (IS_GEN2(dev))
- i830_write_fence_reg(dev, reg, obj);
- else if (IS_GEN3(dev))
- i915_write_fence_reg(dev, reg, obj);
- else if (INTEL_INFO(dev)->gen >= 4)
- i965_write_fence_reg(dev, reg, obj);
-
- /* And similarly be paranoid that no direct access to this region
- * is reordered to before the fence is installed.
- */
- if (i915_gem_object_needs_mb(obj))
- mb();
-}
-
-static inline int fence_number(struct drm_i915_private *dev_priv,
- struct drm_i915_fence_reg *fence)
-{
- return fence - dev_priv->fence_regs;
-}
-
-static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
- struct drm_i915_fence_reg *fence,
- bool enable)
-{
- struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
- int reg = fence_number(dev_priv, fence);
-
- i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
-
- if (enable) {
- obj->fence_reg = reg;
- fence->obj = obj;
- list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
- } else {
- obj->fence_reg = I915_FENCE_REG_NONE;
- fence->obj = NULL;
- list_del_init(&fence->lru_list);
- }
- obj->fence_dirty = false;
-}
-
-static int
-i915_gem_object_wait_fence(struct drm_i915_gem_object *obj)
-{
- if (obj->last_fenced_req) {
- int ret = i915_wait_request(obj->last_fenced_req);
- if (ret)
- return ret;
-
- i915_gem_request_assign(&obj->last_fenced_req, NULL);
- }
-
- return 0;
-}
-
-int
-i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
-{
- struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
- struct drm_i915_fence_reg *fence;
- int ret;
-
- ret = i915_gem_object_wait_fence(obj);
- if (ret)
- return ret;
-
- if (obj->fence_reg == I915_FENCE_REG_NONE)
- return 0;
-
- fence = &dev_priv->fence_regs[obj->fence_reg];
-
- if (WARN_ON(fence->pin_count))
- return -EBUSY;
-
- i915_gem_object_fence_lost(obj);
- i915_gem_object_update_fence(obj, fence, false);
-
- return 0;
-}
-
-static struct drm_i915_fence_reg *
-i915_find_fence_reg(struct drm_device *dev)
-{
- struct drm_i915_private *dev_priv = dev->dev_private;
- struct drm_i915_fence_reg *reg, *avail;
- int i;
-
- /* First try to find a free reg */
- avail = NULL;
- for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
- reg = &dev_priv->fence_regs[i];
- if (!reg->obj)
- return reg;
-
- if (!reg->pin_count)
- avail = reg;
- }
-
- if (avail == NULL)
- goto deadlock;
-
- /* None available, try to steal one or wait for a user to finish */
- list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
- if (reg->pin_count)
- continue;
-
- return reg;
- }
-
-deadlock:
- /* Wait for completion of pending flips which consume fences */
- if (intel_has_pending_fb_unpin(dev))
- return ERR_PTR(-EAGAIN);
-
- return ERR_PTR(-EDEADLK);
-}
-
-/**
- * i915_gem_object_get_fence - set up fencing for an object
- * @obj: object to map through a fence reg
- *
- * When mapping objects through the GTT, userspace wants to be able to write
- * to them without having to worry about swizzling if the object is tiled.
- * This function walks the fence regs looking for a free one for @obj,
- * stealing one if it can't find any.
- *
- * It then sets up the reg based on the object's properties: address, pitch
- * and tiling format.
- *
- * For an untiled surface, this removes any existing fence.
- */
-int
-i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
-{
- struct drm_device *dev = obj->base.dev;
- struct drm_i915_private *dev_priv = dev->dev_private;
- bool enable = obj->tiling_mode != I915_TILING_NONE;
- struct drm_i915_fence_reg *reg;
- int ret;
-
- /* Have we updated the tiling parameters upon the object and so
- * will need to serialise the write to the associated fence register?
- */
- if (obj->fence_dirty) {
- ret = i915_gem_object_wait_fence(obj);
- if (ret)
- return ret;
- }
-
- /* Just update our place in the LRU if our fence is getting reused. */
- if (obj->fence_reg != I915_FENCE_REG_NONE) {
- reg = &dev_priv->fence_regs[obj->fence_reg];
- if (!obj->fence_dirty) {
- list_move_tail(®->lru_list,
- &dev_priv->mm.fence_list);
- return 0;
- }
- } else if (enable) {
- if (WARN_ON(!obj->map_and_fenceable))
- return -EINVAL;
-
- reg = i915_find_fence_reg(dev);
- if (IS_ERR(reg))
- return PTR_ERR(reg);
-
- if (reg->obj) {
- struct drm_i915_gem_object *old = reg->obj;
-
- ret = i915_gem_object_wait_fence(old);
- if (ret)
- return ret;
-
- i915_gem_object_fence_lost(old);
- }
- } else
- return 0;
-
- i915_gem_object_update_fence(obj, reg, enable);
-
- return 0;
-}
-
static bool i915_gem_valid_gtt_space(struct i915_vma *vma,
unsigned long cache_level)
{
@@ -4476,32 +4101,6 @@ i915_gem_object_ggtt_unpin_view(struct drm_i915_gem_object *obj,
--vma->pin_count;
}
-bool
-i915_gem_object_pin_fence(struct drm_i915_gem_object *obj)
-{
- if (obj->fence_reg != I915_FENCE_REG_NONE) {
- struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
- struct i915_vma *ggtt_vma = i915_gem_obj_to_ggtt(obj);
-
- WARN_ON(!ggtt_vma ||
- dev_priv->fence_regs[obj->fence_reg].pin_count >
- ggtt_vma->pin_count);
- dev_priv->fence_regs[obj->fence_reg].pin_count++;
- return true;
- } else
- return false;
-}
-
-void
-i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj)
-{
- if (obj->fence_reg != I915_FENCE_REG_NONE) {
- struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
- WARN_ON(dev_priv->fence_regs[obj->fence_reg].pin_count <= 0);
- dev_priv->fence_regs[obj->fence_reg].pin_count--;
- }
-}
-
int
i915_gem_busy_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
diff --git a/drivers/gpu/drm/i915/i915_gem_fence.c b/drivers/gpu/drm/i915/i915_gem_fence.c
new file mode 100644
index 000000000000..d3284ee04794
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gem_fence.c
@@ -0,0 +1,422 @@
+/*
+ * Copyright © 2008-2015 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.
+ */
+
+#include <drm/drmP.h>
+#include <drm/i915_drm.h>
+#include "i915_drv.h"
+
+static void i965_write_fence_reg(struct drm_device *dev, int reg,
+ struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int fence_reg;
+ int fence_pitch_shift;
+
+ if (INTEL_INFO(dev)->gen >= 6) {
+ fence_reg = FENCE_REG_SANDYBRIDGE_0;
+ fence_pitch_shift = SANDYBRIDGE_FENCE_PITCH_SHIFT;
+ } else {
+ fence_reg = FENCE_REG_965_0;
+ fence_pitch_shift = I965_FENCE_PITCH_SHIFT;
+ }
+
+ fence_reg += reg * 8;
+
+ /* To w/a incoherency with non-atomic 64-bit register updates,
+ * we split the 64-bit update into two 32-bit writes. In order
+ * for a partial fence not to be evaluated between writes, we
+ * precede the update with write to turn off the fence register,
+ * and only enable the fence as the last step.
+ *
+ * For extra levels of paranoia, we make sure each step lands
+ * before applying the next step.
+ */
+ I915_WRITE(fence_reg, 0);
+ POSTING_READ(fence_reg);
+
+ if (obj) {
+ u32 size = i915_gem_obj_ggtt_size(obj);
+ uint64_t val;
+
+ /* Adjust fence size to match tiled area */
+ if (obj->tiling_mode != I915_TILING_NONE) {
+ uint32_t row_size = obj->stride *
+ (obj->tiling_mode == I915_TILING_Y ? 32 : 8);
+ size = (size / row_size) * row_size;
+ }
+
+ val = (uint64_t)((i915_gem_obj_ggtt_offset(obj) + size - 4096) &
+ 0xfffff000) << 32;
+ val |= i915_gem_obj_ggtt_offset(obj) & 0xfffff000;
+ val |= (uint64_t)((obj->stride / 128) - 1) << fence_pitch_shift;
+ if (obj->tiling_mode == I915_TILING_Y)
+ val |= 1 << I965_FENCE_TILING_Y_SHIFT;
+ val |= I965_FENCE_REG_VALID;
+
+ I915_WRITE(fence_reg + 4, val >> 32);
+ POSTING_READ(fence_reg + 4);
+
+ I915_WRITE(fence_reg + 0, val);
+ POSTING_READ(fence_reg);
+ } else {
+ I915_WRITE(fence_reg + 4, 0);
+ POSTING_READ(fence_reg + 4);
+ }
+}
+
+static void i915_write_fence_reg(struct drm_device *dev, int reg,
+ struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 val;
+
+ if (obj) {
+ u32 size = i915_gem_obj_ggtt_size(obj);
+ int pitch_val;
+ int tile_width;
+
+ WARN((i915_gem_obj_ggtt_offset(obj) & ~I915_FENCE_START_MASK) ||
+ (size & -size) != size ||
+ (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
+ "object 0x%08lx [fenceable? %d] not 1M or pot-size (0x%08x) aligned\n",
+ i915_gem_obj_ggtt_offset(obj), obj->map_and_fenceable, size);
+
+ if (obj->tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
+ tile_width = 128;
+ else
+ tile_width = 512;
+
+ /* Note: pitch better be a power of two tile widths */
+ pitch_val = obj->stride / tile_width;
+ pitch_val = ffs(pitch_val) - 1;
+
+ val = i915_gem_obj_ggtt_offset(obj);
+ if (obj->tiling_mode == I915_TILING_Y)
+ val |= 1 << I830_FENCE_TILING_Y_SHIFT;
+ val |= I915_FENCE_SIZE_BITS(size);
+ val |= pitch_val << I830_FENCE_PITCH_SHIFT;
+ val |= I830_FENCE_REG_VALID;
+ } else
+ val = 0;
+
+ if (reg < 8)
+ reg = FENCE_REG_830_0 + reg * 4;
+ else
+ reg = FENCE_REG_945_8 + (reg - 8) * 4;
+
+ I915_WRITE(reg, val);
+ POSTING_READ(reg);
+}
+
+static void i830_write_fence_reg(struct drm_device *dev, int reg,
+ struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ uint32_t val;
+
+ if (obj) {
+ u32 size = i915_gem_obj_ggtt_size(obj);
+ uint32_t pitch_val;
+
+ WARN((i915_gem_obj_ggtt_offset(obj) & ~I830_FENCE_START_MASK) ||
+ (size & -size) != size ||
+ (i915_gem_obj_ggtt_offset(obj) & (size - 1)),
+ "object 0x%08lx not 512K or pot-size 0x%08x aligned\n",
+ i915_gem_obj_ggtt_offset(obj), size);
+
+ pitch_val = obj->stride / 128;
+ pitch_val = ffs(pitch_val) - 1;
+
+ val = i915_gem_obj_ggtt_offset(obj);
+ if (obj->tiling_mode == I915_TILING_Y)
+ val |= 1 << I830_FENCE_TILING_Y_SHIFT;
+ val |= I830_FENCE_SIZE_BITS(size);
+ val |= pitch_val << I830_FENCE_PITCH_SHIFT;
+ val |= I830_FENCE_REG_VALID;
+ } else
+ val = 0;
+
+ I915_WRITE(FENCE_REG_830_0 + reg * 4, val);
+ POSTING_READ(FENCE_REG_830_0 + reg * 4);
+}
+
+inline static bool i915_gem_object_needs_mb(struct drm_i915_gem_object *obj)
+{
+ return obj && obj->base.read_domains & I915_GEM_DOMAIN_GTT;
+}
+
+static void i915_gem_write_fence(struct drm_device *dev, int reg,
+ struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ /* Ensure that all CPU reads are completed before installing a fence
+ * and all writes before removing the fence.
+ */
+ if (i915_gem_object_needs_mb(dev_priv->fence_regs[reg].obj))
+ mb();
+
+ WARN(obj && (!obj->stride || !obj->tiling_mode),
+ "bogus fence setup with stride: 0x%x, tiling mode: %i\n",
+ obj->stride, obj->tiling_mode);
+
+ if (IS_GEN2(dev))
+ i830_write_fence_reg(dev, reg, obj);
+ else if (IS_GEN3(dev))
+ i915_write_fence_reg(dev, reg, obj);
+ else if (INTEL_INFO(dev)->gen >= 4)
+ i965_write_fence_reg(dev, reg, obj);
+
+ /* And similarly be paranoid that no direct access to this region
+ * is reordered to before the fence is installed.
+ */
+ if (i915_gem_object_needs_mb(obj))
+ mb();
+}
+
+static inline int fence_number(struct drm_i915_private *dev_priv,
+ struct drm_i915_fence_reg *fence)
+{
+ return fence - dev_priv->fence_regs;
+}
+
+static void i915_gem_object_update_fence(struct drm_i915_gem_object *obj,
+ struct drm_i915_fence_reg *fence,
+ bool enable)
+{
+ struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
+ int reg = fence_number(dev_priv, fence);
+
+ i915_gem_write_fence(obj->base.dev, reg, enable ? obj : NULL);
+
+ if (enable) {
+ obj->fence_reg = reg;
+ fence->obj = obj;
+ list_move_tail(&fence->lru_list, &dev_priv->mm.fence_list);
+ } else {
+ obj->fence_reg = I915_FENCE_REG_NONE;
+ fence->obj = NULL;
+ list_del_init(&fence->lru_list);
+ }
+ obj->fence_dirty = false;
+}
+
+static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj)
+{
+ if (obj->tiling_mode)
+ i915_gem_release_mmap(obj);
+
+ /* As we do not have an associated fence register, we will force
+ * a tiling change if we ever need to acquire one.
+ */
+ obj->fence_dirty = false;
+ obj->fence_reg = I915_FENCE_REG_NONE;
+}
+
+static int
+i915_gem_object_wait_fence(struct drm_i915_gem_object *obj)
+{
+ if (obj->last_fenced_req) {
+ int ret = i915_wait_request(obj->last_fenced_req);
+ if (ret)
+ return ret;
+
+ i915_gem_request_assign(&obj->last_fenced_req, NULL);
+ }
+
+ return 0;
+}
+
+int
+i915_gem_object_put_fence(struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
+ struct drm_i915_fence_reg *fence;
+ int ret;
+
+ ret = i915_gem_object_wait_fence(obj);
+ if (ret)
+ return ret;
+
+ if (obj->fence_reg == I915_FENCE_REG_NONE)
+ return 0;
+
+ fence = &dev_priv->fence_regs[obj->fence_reg];
+
+ if (WARN_ON(fence->pin_count))
+ return -EBUSY;
+
+ i915_gem_object_fence_lost(obj);
+ i915_gem_object_update_fence(obj, fence, false);
+
+ return 0;
+}
+
+static struct drm_i915_fence_reg *
+i915_find_fence_reg(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_i915_fence_reg *reg, *avail;
+ int i;
+
+ /* First try to find a free reg */
+ avail = NULL;
+ for (i = dev_priv->fence_reg_start; i < dev_priv->num_fence_regs; i++) {
+ reg = &dev_priv->fence_regs[i];
+ if (!reg->obj)
+ return reg;
+
+ if (!reg->pin_count)
+ avail = reg;
+ }
+
+ if (avail == NULL)
+ goto deadlock;
+
+ /* None available, try to steal one or wait for a user to finish */
+ list_for_each_entry(reg, &dev_priv->mm.fence_list, lru_list) {
+ if (reg->pin_count)
+ continue;
+
+ return reg;
+ }
+
+deadlock:
+ /* Wait for completion of pending flips which consume fences */
+ if (intel_has_pending_fb_unpin(dev))
+ return ERR_PTR(-EAGAIN);
+
+ return ERR_PTR(-EDEADLK);
+}
+
+/**
+ * i915_gem_object_get_fence - set up fencing for an object
+ * @obj: object to map through a fence reg
+ *
+ * When mapping objects through the GTT, userspace wants to be able to write
+ * to them without having to worry about swizzling if the object is tiled.
+ * This function walks the fence regs looking for a free one for @obj,
+ * stealing one if it can't find any.
+ *
+ * It then sets up the reg based on the object's properties: address, pitch
+ * and tiling format.
+ *
+ * For an untiled surface, this removes any existing fence.
+ */
+int
+i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
+{
+ struct drm_device *dev = obj->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ bool enable = obj->tiling_mode != I915_TILING_NONE;
+ struct drm_i915_fence_reg *reg;
+ int ret;
+
+ /* Have we updated the tiling parameters upon the object and so
+ * will need to serialise the write to the associated fence register?
+ */
+ if (obj->fence_dirty) {
+ ret = i915_gem_object_wait_fence(obj);
+ if (ret)
+ return ret;
+ }
+
+ /* Just update our place in the LRU if our fence is getting reused. */
+ if (obj->fence_reg != I915_FENCE_REG_NONE) {
+ reg = &dev_priv->fence_regs[obj->fence_reg];
+ if (!obj->fence_dirty) {
+ list_move_tail(®->lru_list,
+ &dev_priv->mm.fence_list);
+ return 0;
+ }
+ } else if (enable) {
+ if (WARN_ON(!obj->map_and_fenceable))
+ return -EINVAL;
+
+ reg = i915_find_fence_reg(dev);
+ if (IS_ERR(reg))
+ return PTR_ERR(reg);
+
+ if (reg->obj) {
+ struct drm_i915_gem_object *old = reg->obj;
+
+ ret = i915_gem_object_wait_fence(old);
+ if (ret)
+ return ret;
+
+ i915_gem_object_fence_lost(old);
+ }
+ } else
+ return 0;
+
+ i915_gem_object_update_fence(obj, reg, enable);
+
+ return 0;
+}
+
+bool
+i915_gem_object_pin_fence(struct drm_i915_gem_object *obj)
+{
+ if (obj->fence_reg != I915_FENCE_REG_NONE) {
+ struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
+ struct i915_vma *ggtt_vma = i915_gem_obj_to_ggtt(obj);
+
+ WARN_ON(!ggtt_vma ||
+ dev_priv->fence_regs[obj->fence_reg].pin_count >
+ ggtt_vma->pin_count);
+ dev_priv->fence_regs[obj->fence_reg].pin_count++;
+ return true;
+ } else
+ return false;
+}
+
+void
+i915_gem_object_unpin_fence(struct drm_i915_gem_object *obj)
+{
+ if (obj->fence_reg != I915_FENCE_REG_NONE) {
+ struct drm_i915_private *dev_priv = obj->base.dev->dev_private;
+ WARN_ON(dev_priv->fence_regs[obj->fence_reg].pin_count <= 0);
+ dev_priv->fence_regs[obj->fence_reg].pin_count--;
+ }
+}
+
+void i915_gem_restore_fences(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int i;
+
+ for (i = 0; i < dev_priv->num_fence_regs; i++) {
+ struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
+
+ /*
+ * Commit delayed tiling changes if we have an object still
+ * attached to the fence, otherwise just clear the fence.
+ */
+ if (reg->obj) {
+ i915_gem_object_update_fence(reg->obj, reg,
+ reg->obj->tiling_mode);
+ } else {
+ i915_gem_write_fence(dev, i, NULL);
+ }
+ }
+}
--
2.1.4
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