Re: [PATCH 2/3] drm/i915: add render state initialization

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On Tue, Apr 22, 2014 at 08:19:43PM +0300, Mika Kuoppala wrote:
> HW guys say that it is not a cool idea to let device
> go into rc6 without proper 3d pipeline state.
> 
> For each new uninitialized context, generate a
> valid null render state to be run on context
> creation.
> 
> This patch introduces a skeleton with emty states.
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/Makefile                 |    1 +
>  drivers/gpu/drm/i915/i915_drv.h               |    2 +
>  drivers/gpu/drm/i915/i915_gem_context.c       |    7 +
>  drivers/gpu/drm/i915/i915_gem_render_state.c  |  222 +++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_renderstate_gen6.h |   11 ++
>  drivers/gpu/drm/i915/intel_renderstate_gen7.h |   11 ++
>  drivers/gpu/drm/i915/intel_renderstate_gen8.h |   11 ++

Imo static const arrays in headers look ugly ... I prefer we just add
normal C files with forward declarations in i915_gem_render_state.c.

In the i915/Makefile you could add a new section for all these golden
renderstate files. I know this is a bikeshed, but ;-)
-Daniel

>  7 files changed, 265 insertions(+)
>  create mode 100644 drivers/gpu/drm/i915/i915_gem_render_state.c
>  create mode 100644 drivers/gpu/drm/i915/intel_renderstate_gen6.h
>  create mode 100644 drivers/gpu/drm/i915/intel_renderstate_gen7.h
>  create mode 100644 drivers/gpu/drm/i915/intel_renderstate_gen8.h
> 
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index b1445b7..b5d4029 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -18,6 +18,7 @@ i915-$(CONFIG_DEBUG_FS) += i915_debugfs.o
>  # GEM code
>  i915-y += i915_cmd_parser.o \
>  	  i915_gem_context.o \
> +	  i915_gem_render_state.o \
>  	  i915_gem_debug.o \
>  	  i915_gem_dmabuf.o \
>  	  i915_gem_evict.o \
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 43b022c..f6ae2ee 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2330,6 +2330,8 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
>  int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
>  				   struct drm_file *file);
>  
> +/* i915_gem_render_state.c */
> +int i915_gem_init_render_state(struct intel_ring_buffer *ring);
>  /* i915_gem_evict.c */
>  int __must_check i915_gem_evict_something(struct drm_device *dev,
>  					  struct i915_address_space *vm,
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index 30b355a..d648d4d 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -746,6 +746,13 @@ static int do_switch(struct intel_ring_buffer *ring,
>  		/* obj is kept alive until the next request by its active ref */
>  		i915_gem_object_ggtt_unpin(from->obj);
>  		i915_gem_context_unreference(from);
> +	} else {
> +		if (ring->id == RCS && to->is_initialized == false) {
> +
> +			ret = i915_gem_init_render_state(ring);
> +			if (ret)
> +				DRM_ERROR("init render state: %d\n", ret);
> +		}
>  	}
>  
>  	to->is_initialized = true;
> diff --git a/drivers/gpu/drm/i915/i915_gem_render_state.c b/drivers/gpu/drm/i915/i915_gem_render_state.c
> new file mode 100644
> index 0000000..409f99b
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/i915_gem_render_state.c
> @@ -0,0 +1,222 @@
> +/*
> + * Copyright © 2014 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:
> + *    Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
> + *
> + */
> +
> +#include "i915_drv.h"
> +
> +#include "intel_renderstate_gen6.h"
> +#include "intel_renderstate_gen7.h"
> +#include "intel_renderstate_gen8.h"
> +
> +#define BATCH_MAX_SIZE 4096
> +
> +struct i915_render_state {
> +	struct drm_i915_gem_object *obj;
> +	unsigned long ggtt_offset;
> +	void *batch;
> +	u32 size;
> +	u32 len;
> +};
> +
> +static struct i915_render_state *
> +render_state_alloc(struct drm_device *dev, unsigned int size)
> +{
> +	struct i915_render_state *so;
> +	int ret;
> +
> +	so = kzalloc(sizeof(*so), GFP_KERNEL);
> +	if (!so)
> +		return ERR_PTR(-ENOMEM);
> +
> +	so->size = ALIGN(size, 4096);
> +
> +	so->obj = i915_gem_alloc_object(dev, so->size);
> +	if (so->obj == NULL) {
> +		ret = -ENOMEM;
> +		goto free;
> +	}
> +
> +	ret = i915_gem_obj_ggtt_pin(so->obj, 4096, 0);
> +	if (ret)
> +		goto free_gem;
> +
> +	so->batch = i915_gem_vmap_obj(so->obj);
> +	if (!so->batch) {
> +		ret = -ENOMEM;
> +		goto unpin;
> +	}
> +
> +	so->ggtt_offset = i915_gem_obj_ggtt_offset(so->obj);
> +
> +	return so;
> +unpin:
> +	i915_gem_object_ggtt_unpin(so->obj);
> +free_gem:
> +	drm_gem_object_unreference(&so->obj->base);
> +free:
> +	kfree(so);
> +	return ERR_PTR(ret);
> +}
> +
> +static void render_state_free(struct i915_render_state *so)
> +{
> +	vunmap(so->batch);
> +	i915_gem_object_ggtt_unpin(so->obj);
> +	drm_gem_object_unreference(&so->obj->base);
> +	kfree(so);
> +}
> +
> +struct render_state_ro_data {
> +	const u32 *batch;
> +	unsigned int batch_items;
> +	const u32 *reloc;
> +	unsigned int reloc_items;
> +	bool reloc_64bit;
> +};
> +
> +static int render_state_copy(struct i915_render_state *so,
> +			     const struct render_state_ro_data *source)
> +{
> +	const u64 goffset = i915_gem_obj_ggtt_offset(so->obj);
> +	const unsigned int num_relocs = source->reloc_items;
> +	int reloc_index = 0;
> +	u32 *d = (uint32_t *)so->batch;
> +	unsigned int i = 0;
> +
> +	if (source->batch_items * sizeof(*source->batch) > so->size)
> +		return -EINVAL;
> +
> +	while (i < source->batch_items) {
> +		u32 s = source->batch[i];
> +
> +		if (reloc_index < num_relocs &&
> +		    i * 4  == source->reloc[reloc_index]) {
> +
> +			s += goffset & 0xffffffff;
> +
> +			/* We keep batch offsets max 32bit */
> +			if (source->reloc_64bit) {
> +				if (i + 1 >= source->batch_items ||
> +				    source->batch[i + 1] != 0)
> +					return -EINVAL;
> +
> +				d[i] = s;
> +				i++;
> +				s = (goffset & 0xffffffff00000000ull) >> 32;
> +			}
> +
> +			reloc_index++;
> +		}
> +
> +		d[i] = s;
> +		i++;
> +	}
> +
> +	if (num_relocs != reloc_index) {
> +		DRM_ERROR("not all relocs resolved, %d out of %d\n",
> +			  reloc_index, num_relocs);
> +		return -EINVAL;
> +	}
> +
> +	so->len = source->batch_items * sizeof(*source->batch);
> +
> +	return 0;
> +}
> +
> +static int render_state_get(struct i915_render_state *so, int gen)
> +{
> +	struct render_state_ro_data ro_data;
> +
> +#define RS_SETUP(_d, _g, _r) {						\
> +		if (!sizeof(gen ## _g ## _null_state_batch))		\
> +			return -EINVAL;					\
> +		if (sizeof(gen ## _g ## _null_state_batch) & 0x3)	\
> +			return -EINVAL;					\
> +		if (sizeof(gen ## _g ## _null_state_relocs) & 0x3)	\
> +			return -EINVAL;					\
> +		_d.batch = gen ## _g ## _null_state_batch;		\
> +		_d.batch_items = sizeof(gen ##_g ## _null_state_batch) / 4; \
> +		_d.reloc = gen ## _g ## _null_state_relocs;		\
> +		_d.reloc_items = sizeof(gen ## _g ## _null_state_relocs) / 4; \
> +		_d.reloc_64bit = _r;					\
> +	}
> +
> +	switch (gen) {
> +	case 6:
> +		RS_SETUP(ro_data, 6, false);
> +		break;
> +	case 7:
> +		RS_SETUP(ro_data, 7, false);
> +		break;
> +	case 8:
> +		RS_SETUP(ro_data, 8, true);
> +		break;
> +	default:
> +		return -ENOENT;
> +	}
> +#undef RS_SETUP
> +
> +	return render_state_copy(so, &ro_data);
> +}
> +
> +int i915_gem_init_render_state(struct intel_ring_buffer *ring)
> +{
> +	const int gen = INTEL_INFO(ring->dev)->gen;
> +	struct i915_render_state *so;
> +	u32 seqno;
> +	int ret;
> +
> +	if (gen < 6)
> +		return 0;
> +
> +	so = render_state_alloc(ring->dev, BATCH_MAX_SIZE);
> +	if (IS_ERR(so))
> +		return PTR_ERR(so);
> +
> +	ret = render_state_get(so, gen);
> +	if (ret)
> +		goto out;
> +
> +	ret = ring->dispatch_execbuffer(ring,
> +					i915_gem_obj_ggtt_offset(so->obj),
> +					so->len,
> +					I915_DISPATCH_SECURE);
> +	if (ret)
> +		goto out;
> +
> +	ret = intel_ring_flush_all_caches(ring);
> +	if (ret)
> +		goto out;
> +
> +	ret = i915_add_request(ring, &seqno);
> +	if (ret)
> +		goto out;
> +
> +	ret = i915_wait_seqno(ring, seqno);
> +out:
> +	render_state_free(so);
> +	return ret;
> +}
> diff --git a/drivers/gpu/drm/i915/intel_renderstate_gen6.h b/drivers/gpu/drm/i915/intel_renderstate_gen6.h
> new file mode 100644
> index 0000000..4809f2f
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_renderstate_gen6.h
> @@ -0,0 +1,11 @@
> +#ifndef __INTEL_RENDERSTATE_GEN6
> +#define __INTEL_RENDERSTATE_GEN6
> +
> +static const uint32_t gen6_null_state_relocs[] = {
> +};
> +
> +static const uint32_t gen6_null_state_batch[] = {
> +	MI_BATCH_BUFFER_END,
> +};
> +
> +#endif /* __INTEL_RENDERSTATE_GEN6 */
> diff --git a/drivers/gpu/drm/i915/intel_renderstate_gen7.h b/drivers/gpu/drm/i915/intel_renderstate_gen7.h
> new file mode 100644
> index 0000000..9b1420b
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_renderstate_gen7.h
> @@ -0,0 +1,11 @@
> +#ifndef __INTEL_RENDERSTATE_GEN7
> +#define __INTEL_RENDERSTATE_GEN7
> +
> +static const uint32_t gen7_null_state_relocs[] = {
> +};
> +
> +static const uint32_t gen7_null_state_batch[] = {
> +	MI_BATCH_BUFFER_END,
> +};
> +
> +#endif /* __INTEL_RENDERSTATE_GEN7 */
> diff --git a/drivers/gpu/drm/i915/intel_renderstate_gen8.h b/drivers/gpu/drm/i915/intel_renderstate_gen8.h
> new file mode 100644
> index 0000000..d349dda
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_renderstate_gen8.h
> @@ -0,0 +1,11 @@
> +#ifndef __INTEL_RENDERSTATE_GEN8
> +#define __INTEL_RENDERSTATE_GEN8
> +
> +static const uint32_t gen8_null_state_relocs[] = {
> +};
> +
> +static const uint32_t gen8_null_state_batch[] = {
> +	MI_BATCH_BUFFER_END,
> +};
> +
> +#endif /* __INTEL_RENDERSTATE_GEN8 */
> -- 
> 1.7.9.5
> 
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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