From 957870f9341201b176e41eb5fa8a750b13e501aa Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 10 Jan 2017 12:10:45 +0000 Subject: [PATCH] drm/i915: Split out i915_gem_object_set_tiling() Expose an interface for changing the tiling and stride on an object, that includes the complexity of checking for conflicting bindings and fence registers. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/20170110121045.27144-2-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_object.h | 3 + drivers/gpu/drm/i915/i915_gem_tiling.c | 237 +++++++++++++------------ 2 files changed, 127 insertions(+), 113 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_object.h b/drivers/gpu/drm/i915/i915_gem_object.h index ed3f4d5fd49f..290eaa7fc9eb 100644 --- a/drivers/gpu/drm/i915/i915_gem_object.h +++ b/drivers/gpu/drm/i915/i915_gem_object.h @@ -337,6 +337,9 @@ i915_gem_object_get_tile_row_size(struct drm_i915_gem_object *obj) i915_gem_object_get_tile_height(obj)); } +int i915_gem_object_set_tiling(struct drm_i915_gem_object *obj, + unsigned int tiling, unsigned int stride); + static inline struct intel_engine_cs * i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj) { diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c index 59c010d8f47b..4f83e331f598 100644 --- a/drivers/gpu/drm/i915/i915_gem_tiling.c +++ b/drivers/gpu/drm/i915/i915_gem_tiling.c @@ -129,61 +129,56 @@ u32 i915_gem_fence_alignment(struct drm_i915_private *i915, u32 size, /* Check pitch constriants for all chips & tiling formats */ static bool -i915_tiling_ok(struct drm_i915_private *dev_priv, - int stride, int size, int tiling_mode) +i915_tiling_ok(struct drm_i915_gem_object *obj, + unsigned int tiling, unsigned int stride) { - int tile_width; + struct drm_i915_private *i915 = to_i915(obj->base.dev); + unsigned int tile_width; /* Linear is always fine */ - if (tiling_mode == I915_TILING_NONE) + if (tiling == I915_TILING_NONE) return true; - if (tiling_mode > I915_TILING_LAST) + if (tiling > I915_TILING_LAST) return false; - if (IS_GEN2(dev_priv) || - (tiling_mode == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev_priv))) - tile_width = 128; - else - tile_width = 512; - /* check maximum stride & object size */ /* i965+ stores the end address of the gtt mapping in the fence * reg, so dont bother to check the size */ - if (INTEL_GEN(dev_priv) >= 7) { + if (INTEL_GEN(i915) >= 7) { if (stride / 128 > GEN7_FENCE_MAX_PITCH_VAL) return false; - } else if (INTEL_GEN(dev_priv) >= 4) { + } else if (INTEL_GEN(i915) >= 4) { if (stride / 128 > I965_FENCE_MAX_PITCH_VAL) return false; } else { if (stride > 8192) return false; - if (IS_GEN3(dev_priv)) { - if (size > I830_FENCE_MAX_SIZE_VAL << 20) + if (IS_GEN3(i915)) { + if (obj->base.size > I830_FENCE_MAX_SIZE_VAL << 20) return false; } else { - if (size > I830_FENCE_MAX_SIZE_VAL << 19) + if (obj->base.size > I830_FENCE_MAX_SIZE_VAL << 19) return false; } } - if (stride < tile_width) + if (IS_GEN2(i915) || + (tiling == I915_TILING_Y && HAS_128_BYTE_Y_TILING(i915))) + tile_width = 128; + else + tile_width = 512; + + if (stride & (tile_width - 1)) return false; /* 965+ just needs multiples of tile width */ - if (INTEL_GEN(dev_priv) >= 4) { - if (stride & (tile_width - 1)) - return false; + if (INTEL_GEN(i915) >= 4) return true; - } /* Pre-965 needs power of two tile widths */ - if (stride & (stride - 1)) - return false; - - return true; + return is_power_of_2(stride); } static bool i915_vma_fence_prepare(struct i915_vma *vma, @@ -232,6 +227,98 @@ i915_gem_object_fence_prepare(struct drm_i915_gem_object *obj, return 0; } +int +i915_gem_object_set_tiling(struct drm_i915_gem_object *obj, + unsigned int tiling, unsigned int stride) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_vma *vma; + int err; + + /* Make sure we don't cross-contaminate obj->tiling_and_stride */ + BUILD_BUG_ON(I915_TILING_LAST & STRIDE_MASK); + + GEM_BUG_ON(!i915_tiling_ok(obj, tiling, stride)); + GEM_BUG_ON(!stride ^ (tiling == I915_TILING_NONE)); + lockdep_assert_held(&i915->drm.struct_mutex); + + if ((tiling | stride) == obj->tiling_and_stride) + return 0; + + if (obj->framebuffer_references) + return -EBUSY; + + /* We need to rebind the object if its current allocation + * no longer meets the alignment restrictions for its new + * tiling mode. Otherwise we can just leave it alone, but + * need to ensure that any fence register is updated before + * the next fenced (either through the GTT or by the BLT unit + * on older GPUs) access. + * + * After updating the tiling parameters, we then flag whether + * we need to update an associated fence register. Note this + * has to also include the unfenced register the GPU uses + * whilst executing a fenced command for an untiled object. + */ + + err = i915_gem_object_fence_prepare(obj, tiling, stride); + if (err) + return err; + + /* If the memory has unknown (i.e. varying) swizzling, we pin the + * pages to prevent them being swapped out and causing corruption + * due to the change in swizzling. + */ + mutex_lock(&obj->mm.lock); + if (obj->mm.pages && + obj->mm.madv == I915_MADV_WILLNEED && + i915->quirks & QUIRK_PIN_SWIZZLED_PAGES) { + if (tiling == I915_TILING_NONE) { + GEM_BUG_ON(!obj->mm.quirked); + __i915_gem_object_unpin_pages(obj); + obj->mm.quirked = false; + } + if (!i915_gem_object_is_tiled(obj)) { + GEM_BUG_ON(!obj->mm.quirked); + __i915_gem_object_pin_pages(obj); + obj->mm.quirked = true; + } + } + mutex_unlock(&obj->mm.lock); + + list_for_each_entry(vma, &obj->vma_list, obj_link) { + if (!i915_vma_is_ggtt(vma)) + break; + + vma->fence_size = + i915_gem_fence_size(i915, vma->size, tiling, stride); + vma->fence_alignment = + i915_gem_fence_alignment(i915, + vma->size, tiling, stride); + + if (vma->fence) + vma->fence->dirty = true; + } + + obj->tiling_and_stride = tiling | stride; + + /* Force the fence to be reacquired for GTT access */ + i915_gem_release_mmap(obj); + + /* Try to preallocate memory required to save swizzling on put-pages */ + if (i915_gem_object_needs_bit17_swizzle(obj)) { + if (!obj->bit_17) { + obj->bit_17 = kcalloc(BITS_TO_LONGS(obj->base.size >> PAGE_SHIFT), + sizeof(long), GFP_KERNEL); + } + } else { + kfree(obj->bit_17); + obj->bit_17 = NULL; + } + + return 0; +} + /** * i915_gem_set_tiling_ioctl - IOCTL handler to set tiling mode * @dev: DRM device @@ -251,26 +338,15 @@ i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_set_tiling *args = data; - struct drm_i915_private *dev_priv = to_i915(dev); struct drm_i915_gem_object *obj; - int err = 0; - - /* Make sure we don't cross-contaminate obj->tiling_and_stride */ - BUILD_BUG_ON(I915_TILING_LAST & STRIDE_MASK); + int err; obj = i915_gem_object_lookup(file, args->handle); if (!obj) return -ENOENT; - if (!i915_tiling_ok(dev_priv, - args->stride, obj->base.size, args->tiling_mode)) { - i915_gem_object_put(obj); - return -EINVAL; - } - - mutex_lock(&dev->struct_mutex); - if (obj->pin_display || obj->framebuffer_references) { - err = -EBUSY; + if (!i915_tiling_ok(obj, args->tiling_mode, args->stride)) { + err = -EINVAL; goto err; } @@ -279,9 +355,9 @@ i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data, args->stride = 0; } else { if (args->tiling_mode == I915_TILING_X) - args->swizzle_mode = dev_priv->mm.bit_6_swizzle_x; + args->swizzle_mode = to_i915(dev)->mm.bit_6_swizzle_x; else - args->swizzle_mode = dev_priv->mm.bit_6_swizzle_y; + args->swizzle_mode = to_i915(dev)->mm.bit_6_swizzle_y; /* Hide bit 17 swizzling from the user. This prevents old Mesa * from aborting the application on sw fallbacks to bit 17, @@ -303,84 +379,19 @@ i915_gem_set_tiling_ioctl(struct drm_device *dev, void *data, } } - if (args->tiling_mode != i915_gem_object_get_tiling(obj) || - args->stride != i915_gem_object_get_stride(obj)) { - /* We need to rebind the object if its current allocation - * no longer meets the alignment restrictions for its new - * tiling mode. Otherwise we can just leave it alone, but - * need to ensure that any fence register is updated before - * the next fenced (either through the GTT or by the BLT unit - * on older GPUs) access. - * - * After updating the tiling parameters, we then flag whether - * we need to update an associated fence register. Note this - * has to also include the unfenced register the GPU uses - * whilst executing a fenced command for an untiled object. - */ + err = mutex_lock_interruptible(&dev->struct_mutex); + if (err) + goto err; - err = i915_gem_object_fence_prepare(obj, - args->tiling_mode, - args->stride); - if (!err) { - struct i915_vma *vma; - - mutex_lock(&obj->mm.lock); - if (obj->mm.pages && - obj->mm.madv == I915_MADV_WILLNEED && - dev_priv->quirks & QUIRK_PIN_SWIZZLED_PAGES) { - if (args->tiling_mode == I915_TILING_NONE) { - GEM_BUG_ON(!obj->mm.quirked); - __i915_gem_object_unpin_pages(obj); - obj->mm.quirked = false; - } - if (!i915_gem_object_is_tiled(obj)) { - GEM_BUG_ON(!obj->mm.quirked); - __i915_gem_object_pin_pages(obj); - obj->mm.quirked = true; - } - } - mutex_unlock(&obj->mm.lock); - - list_for_each_entry(vma, &obj->vma_list, obj_link) { - if (!i915_vma_is_ggtt(vma)) - break; - - vma->fence_size = i915_gem_fence_size(dev_priv, vma->size, - args->tiling_mode, - args->stride); - vma->fence_alignment = i915_gem_fence_alignment(dev_priv, vma->size, - args->tiling_mode, - args->stride); - - if (vma->fence) - vma->fence->dirty = true; - } - obj->tiling_and_stride = - args->stride | args->tiling_mode; - - /* Force the fence to be reacquired for GTT access */ - i915_gem_release_mmap(obj); - } - } - /* we have to maintain this existing ABI... */ + err = i915_gem_object_set_tiling(obj, args->tiling_mode, args->stride); + mutex_unlock(&dev->struct_mutex); + + /* We have to maintain this existing ABI... */ args->stride = i915_gem_object_get_stride(obj); args->tiling_mode = i915_gem_object_get_tiling(obj); - /* Try to preallocate memory required to save swizzling on put-pages */ - if (i915_gem_object_needs_bit17_swizzle(obj)) { - if (obj->bit_17 == NULL) { - obj->bit_17 = kcalloc(BITS_TO_LONGS(obj->base.size >> PAGE_SHIFT), - sizeof(long), GFP_KERNEL); - } - } else { - kfree(obj->bit_17); - obj->bit_17 = NULL; - } - err: i915_gem_object_put(obj); - mutex_unlock(&dev->struct_mutex); - return err; } -- 2.20.1