From a0ebed38a4aff1f61949063190e0be5f803817a5 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Sun, 19 Dec 2010 11:42:05 +0000 Subject: [PATCH] drm/i915: Allow the application to choose the constant addressing mode The relative-to-general state default is useless as it means having to rewrite the streaming kernels for each batch. Relative-to-surface is more useful, as that stream usually needs to be rewritten for each batch. And absolute addressing mode, vital if you start streaming state, is also only available by adjusting the register... Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_dma.c | 3 ++ drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/i915_gem.c | 2 ++ drivers/gpu/drm/i915/i915_gem_execbuffer.c | 35 +++++++++++++++++++++- include/drm/i915_drm.h | 12 ++++++++ 5 files changed, 52 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 3f7b20392e26a..18746e6cb1295 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -778,6 +778,9 @@ static int i915_getparam(struct drm_device *dev, void *data, case I915_PARAM_HAS_COHERENT_RINGS: value = 1; break; + case I915_PARAM_HAS_EXEC_CONSTANTS: + value = INTEL_INFO(dev)->gen >= 4; + break; default: DRM_DEBUG_DRIVER("Unknown parameter %d\n", param->param); diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 2a653cc803951..aac1bf332f75b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -258,6 +258,7 @@ typedef struct drm_i915_private { const struct intel_device_info *info; int has_gem; + int relative_constants_mode; void __iomem *regs; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 5a0fbe59dd5b7..c79c0b62ef605 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -3735,6 +3735,8 @@ i915_gem_load(struct drm_device *dev) } } + dev_priv->relative_constants_mode = I915_EXEC_CONSTANTS_REL_GENERAL; + /* Old X drivers will take 0-2 for front, back, depth buffers */ if (!drm_core_check_feature(dev, DRIVER_MODESET)) dev_priv->fence_reg_start = 3; diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index fda0dc858a1fa..61129e6759eb4 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -957,7 +957,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, struct intel_ring_buffer *ring; u32 exec_start, exec_len; u32 seqno; - int ret, i; + int ret, mode, i; if (!i915_gem_check_execbuffer(args)) { DRM_ERROR("execbuf with invalid offset/length\n"); @@ -997,6 +997,39 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, return -EINVAL; } + mode = args->flags & I915_EXEC_CONSTANTS_MASK; + switch (mode) { + case I915_EXEC_CONSTANTS_REL_GENERAL: + case I915_EXEC_CONSTANTS_ABSOLUTE: + case I915_EXEC_CONSTANTS_REL_SURFACE: + if (ring == &dev_priv->ring[RCS] && + mode != dev_priv->relative_constants_mode) { + if (INTEL_INFO(dev)->gen < 4) + return -EINVAL; + + if (INTEL_INFO(dev)->gen > 5 && + mode == I915_EXEC_CONSTANTS_REL_SURFACE) + return -EINVAL; + + ret = intel_ring_begin(ring, 4); + if (ret) + return ret; + + intel_ring_emit(ring, MI_NOOP); + intel_ring_emit(ring, MI_LOAD_REGISTER_IMM(1)); + intel_ring_emit(ring, INSTPM); + intel_ring_emit(ring, + I915_EXEC_CONSTANTS_MASK << 16 | mode); + intel_ring_advance(ring); + + dev_priv->relative_constants_mode = mode; + } + break; + default: + DRM_ERROR("execbuf with unknown constants: %d\n", mode); + return -EINVAL; + } + if (args->buffer_count < 1) { DRM_ERROR("execbuf with %d buffers\n", args->buffer_count); return -EINVAL; diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h index a2776e2807a4c..0039f1f97ad86 100644 --- a/include/drm/i915_drm.h +++ b/include/drm/i915_drm.h @@ -289,6 +289,7 @@ typedef struct drm_i915_irq_wait { #define I915_PARAM_HAS_BLT 11 #define I915_PARAM_HAS_RELAXED_FENCING 12 #define I915_PARAM_HAS_COHERENT_RINGS 13 +#define I915_PARAM_HAS_EXEC_CONSTANTS 14 typedef struct drm_i915_getparam { int param; @@ -635,6 +636,17 @@ struct drm_i915_gem_execbuffer2 { #define I915_EXEC_RENDER (1<<0) #define I915_EXEC_BSD (2<<0) #define I915_EXEC_BLT (3<<0) + +/* Used for switching the constants addressing mode on gen4+ RENDER ring. + * Gen6+ only supports relative addressing to dynamic state (default) and + * absolute addressing. + * + * These flags are ignored for the BSD and BLT rings. + */ +#define I915_EXEC_CONSTANTS_MASK (3<<6) +#define I915_EXEC_CONSTANTS_REL_GENERAL (0<<6) /* default */ +#define I915_EXEC_CONSTANTS_ABSOLUTE (1<<6) +#define I915_EXEC_CONSTANTS_REL_SURFACE (2<<6) /* gen4/5 only */ __u64 flags; __u64 rsvd1; __u64 rsvd2; -- 2.39.5