[PATCH v2 2/8] drm/etnaviv: split out cmdbuf mapping into address space

Guido G√ľnther agx at sigxcpu.org
Fri Aug 2 13:39:00 UTC 2019


Hi Lucas,
On Fri, Jul 05, 2019 at 07:17:21PM +0200, Lucas Stach wrote:
> This allows to decouple the cmdbuf suballocator create and mapping
> the region into the GPU address space. Allowing multiple AS to share
> a single cmdbuf suballoc.

Can you tell me where this would apply? I tried 5.2 and next-20190726
with and without

   [PATCH 1/2] drm/etnaviv: fix etnaviv_cmdbuf_suballoc_new return value

applied.
Cheers,
 -- Guido

> Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
> ---
>  drivers/gpu/drm/etnaviv/etnaviv_buffer.c | 23 ++++----
>  drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c | 35 ++++++------
>  drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.h | 11 +++-
>  drivers/gpu/drm/etnaviv/etnaviv_dump.c   |  6 +-
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.c    | 19 +++++--
>  drivers/gpu/drm/etnaviv/etnaviv_gpu.h    |  3 +-
>  drivers/gpu/drm/etnaviv/etnaviv_mmu.c    | 70 +++++++++++++++---------
>  drivers/gpu/drm/etnaviv/etnaviv_mmu.h    | 12 ++--
>  8 files changed, 114 insertions(+), 65 deletions(-)
> 
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c
> index fe0d2d67007d..6400a88cd778 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c
> @@ -118,7 +118,8 @@ static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu,
>  	u32 *ptr = buf->vaddr + off;
>  
>  	dev_info(gpu->dev, "virt %p phys 0x%08x free 0x%08x\n",
> -			ptr, etnaviv_cmdbuf_get_va(buf) + off, size - len * 4 - off);
> +			ptr, etnaviv_cmdbuf_get_va(buf, &gpu->cmdbuf_mapping) +
> +			off, size - len * 4 - off);
>  
>  	print_hex_dump(KERN_INFO, "cmd ", DUMP_PREFIX_OFFSET, 16, 4,
>  			ptr, len * 4, 0);
> @@ -151,7 +152,8 @@ static u32 etnaviv_buffer_reserve(struct etnaviv_gpu *gpu,
>  	if (buffer->user_size + cmd_dwords * sizeof(u64) > buffer->size)
>  		buffer->user_size = 0;
>  
> -	return etnaviv_cmdbuf_get_va(buffer) + buffer->user_size;
> +	return etnaviv_cmdbuf_get_va(buffer, &gpu->cmdbuf_mapping) +
> +	       buffer->user_size;
>  }
>  
>  u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
> @@ -164,8 +166,8 @@ u16 etnaviv_buffer_init(struct etnaviv_gpu *gpu)
>  	buffer->user_size = 0;
>  
>  	CMD_WAIT(buffer);
> -	CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer) +
> -		 buffer->user_size - 4);
> +	CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer, &gpu->cmdbuf_mapping)
> +		 + buffer->user_size - 4);
>  
>  	return buffer->user_size / 8;
>  }
> @@ -291,8 +293,8 @@ void etnaviv_sync_point_queue(struct etnaviv_gpu *gpu, unsigned int event)
>  
>  	/* Append waitlink */
>  	CMD_WAIT(buffer);
> -	CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer) +
> -			    buffer->user_size - 4);
> +	CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer, &gpu->cmdbuf_mapping)
> +		 + buffer->user_size - 4);
>  
>  	/*
>  	 * Kick off the 'sync point' command by replacing the previous
> @@ -319,7 +321,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state,
>  	if (drm_debug & DRM_UT_DRIVER)
>  		etnaviv_buffer_dump(gpu, buffer, 0, 0x50);
>  
> -	link_target = etnaviv_cmdbuf_get_va(cmdbuf);
> +	link_target = etnaviv_cmdbuf_get_va(cmdbuf, &gpu->cmdbuf_mapping);
>  	link_dwords = cmdbuf->size / 8;
>  
>  	/*
> @@ -412,12 +414,13 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state,
>  	CMD_LOAD_STATE(buffer, VIVS_GL_EVENT, VIVS_GL_EVENT_EVENT_ID(event) |
>  		       VIVS_GL_EVENT_FROM_PE);
>  	CMD_WAIT(buffer);
> -	CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer) +
> -			    buffer->user_size - 4);
> +	CMD_LINK(buffer, 2, etnaviv_cmdbuf_get_va(buffer, &gpu->cmdbuf_mapping)
> +		 + buffer->user_size - 4);
>  
>  	if (drm_debug & DRM_UT_DRIVER)
>  		pr_info("stream link to 0x%08x @ 0x%08x %p\n",
> -			return_target, etnaviv_cmdbuf_get_va(cmdbuf),
> +			return_target,
> +			etnaviv_cmdbuf_get_va(cmdbuf, &gpu->cmdbuf_mapping),
>  			cmdbuf->vaddr);
>  
>  	if (drm_debug & DRM_UT_DRIVER) {
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
> index 7b77992f31c4..8915d9d056a6 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c
> @@ -8,6 +8,7 @@
>  #include <drm/drm_mm.h>
>  
>  #include "etnaviv_cmdbuf.h"
> +#include "etnaviv_gem.h"
>  #include "etnaviv_gpu.h"
>  #include "etnaviv_mmu.h"
>  
> @@ -21,10 +22,6 @@ struct etnaviv_cmdbuf_suballoc {
>  	void *vaddr;
>  	dma_addr_t paddr;
>  
> -	/* GPU mapping */
> -	u32 iova;
> -	struct drm_mm_node vram_node; /* only used on MMUv2 */
> -
>  	/* allocation management */
>  	struct mutex lock;
>  	DECLARE_BITMAP(granule_map, SUBALLOC_GRANULES);
> @@ -53,26 +50,31 @@ etnaviv_cmdbuf_suballoc_new(struct etnaviv_gpu * gpu)
>  		goto free_suballoc;
>  	}
>  
> -	ret = etnaviv_iommu_get_suballoc_va(gpu, suballoc->paddr,
> -					    &suballoc->vram_node, SUBALLOC_SIZE,
> -					    &suballoc->iova);
> -	if (ret)
> -		goto free_dma;
> -
>  	return suballoc;
>  
> -free_dma:
> -	dma_free_wc(gpu->dev, SUBALLOC_SIZE, suballoc->vaddr, suballoc->paddr);
>  free_suballoc:
>  	kfree(suballoc);
>  
>  	return ERR_PTR(ret);
>  }
>  
> +int etnaviv_cmdbuf_suballoc_map(struct etnaviv_cmdbuf_suballoc *suballoc,
> +				struct etnaviv_iommu *mmu,
> +				struct etnaviv_vram_mapping *mapping,
> +				u32 memory_base)
> +{
> +	return etnaviv_iommu_get_suballoc_va(mmu, mapping, memory_base,
> +					     suballoc->paddr, SUBALLOC_SIZE);
> +}
> +
> +void etnaviv_cmdbuf_suballoc_unmap(struct etnaviv_iommu *mmu,
> +				   struct etnaviv_vram_mapping *mapping)
> +{
> +	etnaviv_iommu_put_suballoc_va(mmu, mapping);
> +}
> +
>  void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc)
>  {
> -	etnaviv_iommu_put_suballoc_va(suballoc->gpu, &suballoc->vram_node,
> -				      SUBALLOC_SIZE, suballoc->iova);
>  	dma_free_wc(suballoc->gpu->dev, SUBALLOC_SIZE, suballoc->vaddr,
>  		    suballoc->paddr);
>  	kfree(suballoc);
> @@ -126,9 +128,10 @@ void etnaviv_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf)
>  	wake_up_all(&suballoc->free_event);
>  }
>  
> -u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf)
> +u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf,
> +			  struct etnaviv_vram_mapping *mapping)
>  {
> -	return buf->suballoc->iova + buf->suballoc_offset;
> +	return mapping->iova + buf->suballoc_offset;
>  }
>  
>  dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf)
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.h b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.h
> index 49908797456e..11d95f05c017 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.h
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.h
> @@ -9,6 +9,8 @@
>  #include <linux/types.h>
>  
>  struct etnaviv_gpu;
> +struct etnaviv_iommu;
> +struct etnaviv_vram_mapping;
>  struct etnaviv_cmdbuf_suballoc;
>  
>  struct etnaviv_cmdbuf {
> @@ -24,13 +26,20 @@ struct etnaviv_cmdbuf {
>  struct etnaviv_cmdbuf_suballoc *
>  etnaviv_cmdbuf_suballoc_new(struct etnaviv_gpu * gpu);
>  void etnaviv_cmdbuf_suballoc_destroy(struct etnaviv_cmdbuf_suballoc *suballoc);
> +int etnaviv_cmdbuf_suballoc_map(struct etnaviv_cmdbuf_suballoc *suballoc,
> +				struct etnaviv_iommu *mmu,
> +				struct etnaviv_vram_mapping *mapping,
> +				u32 memory_base);
> +void etnaviv_cmdbuf_suballoc_unmap(struct etnaviv_iommu *mmu,
> +				   struct etnaviv_vram_mapping *mapping);
>  
>  
>  int etnaviv_cmdbuf_init(struct etnaviv_cmdbuf_suballoc *suballoc,
>  		struct etnaviv_cmdbuf *cmdbuf, u32 size);
>  void etnaviv_cmdbuf_free(struct etnaviv_cmdbuf *cmdbuf);
>  
> -u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf);
> +u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf,
> +			  struct etnaviv_vram_mapping *mapping);
>  dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf);
>  
>  #endif /* __ETNAVIV_CMDBUF_H__ */
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_dump.c b/drivers/gpu/drm/etnaviv/etnaviv_dump.c
> index 0aa8cde68593..13a63d9dcf54 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_dump.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_dump.c
> @@ -173,11 +173,13 @@ void etnaviv_core_dump(struct etnaviv_gem_submit *submit)
>  
>  	etnaviv_core_dump_mem(&iter, ETDUMP_BUF_RING, gpu->buffer.vaddr,
>  			      gpu->buffer.size,
> -			      etnaviv_cmdbuf_get_va(&gpu->buffer));
> +			      etnaviv_cmdbuf_get_va(&gpu->buffer,
> +						    &gpu->cmdbuf_mapping));
>  
>  	etnaviv_core_dump_mem(&iter, ETDUMP_BUF_CMD,
>  			      submit->cmdbuf.vaddr, submit->cmdbuf.size,
> -			      etnaviv_cmdbuf_get_va(&submit->cmdbuf));
> +			      etnaviv_cmdbuf_get_va(&submit->cmdbuf,
> +						    &gpu->cmdbuf_mapping));
>  
>  	/* Reserve space for the bomap */
>  	if (n_bomap_pages) {
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> index e84a0ed904aa..62a38a63e4eb 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> @@ -687,8 +687,8 @@ static void etnaviv_gpu_hw_init(struct etnaviv_gpu *gpu)
>  	prefetch = etnaviv_buffer_init(gpu);
>  
>  	gpu_write(gpu, VIVS_HI_INTR_ENBL, ~0U);
> -	etnaviv_gpu_start_fe(gpu, etnaviv_cmdbuf_get_va(&gpu->buffer),
> -			     prefetch);
> +	etnaviv_gpu_start_fe(gpu, etnaviv_cmdbuf_get_va(&gpu->buffer,
> +			     &gpu->cmdbuf_mapping), prefetch);
>  }
>  
>  int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
> @@ -767,16 +767,24 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
>  		goto destroy_iommu;
>  	}
>  
> +	ret = etnaviv_cmdbuf_suballoc_map(gpu->cmdbuf_suballoc, gpu->mmu,
> +					  &gpu->cmdbuf_mapping,
> +					  gpu->memory_base);
> +	if (ret) {
> +		dev_err(gpu->dev, "failed to map cmdbuf suballoc\n");
> +		goto destroy_suballoc;
> +	}
> +
>  	/* Create buffer: */
>  	ret = etnaviv_cmdbuf_init(gpu->cmdbuf_suballoc, &gpu->buffer,
>  				  PAGE_SIZE);
>  	if (ret) {
>  		dev_err(gpu->dev, "could not create command buffer\n");
> -		goto destroy_suballoc;
> +		goto unmap_suballoc;
>  	}
>  
>  	if (gpu->mmu->version == ETNAVIV_IOMMU_V1 &&
> -	    etnaviv_cmdbuf_get_va(&gpu->buffer) > 0x80000000) {
> +	    etnaviv_cmdbuf_get_va(&gpu->buffer, &gpu->cmdbuf_mapping) > 0x80000000) {
>  		ret = -EINVAL;
>  		dev_err(gpu->dev,
>  			"command buffer outside valid memory window\n");
> @@ -805,6 +813,8 @@ int etnaviv_gpu_init(struct etnaviv_gpu *gpu)
>  
>  free_buffer:
>  	etnaviv_cmdbuf_free(&gpu->buffer);
> +unmap_suballoc:
> +	etnaviv_cmdbuf_suballoc_unmap(gpu->mmu, &gpu->cmdbuf_mapping);
>  destroy_suballoc:
>  	etnaviv_cmdbuf_suballoc_destroy(gpu->cmdbuf_suballoc);
>  destroy_iommu:
> @@ -1681,6 +1691,7 @@ static void etnaviv_gpu_unbind(struct device *dev, struct device *master,
>  
>  	if (gpu->initialized) {
>  		etnaviv_cmdbuf_free(&gpu->buffer);
> +		etnaviv_cmdbuf_suballoc_unmap(gpu->mmu, &gpu->cmdbuf_mapping);
>  		etnaviv_cmdbuf_suballoc_destroy(gpu->cmdbuf_suballoc);
>  		etnaviv_iommu_destroy(gpu->mmu);
>  		gpu->initialized = false;
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
> index b06c7c98d522..6a6add350d2d 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h
> @@ -7,6 +7,7 @@
>  #define __ETNAVIV_GPU_H__
>  
>  #include "etnaviv_cmdbuf.h"
> +#include "etnaviv_gem.h"
>  #include "etnaviv_drv.h"
>  
>  struct etnaviv_gem_submit;
> @@ -84,7 +85,6 @@ struct etnaviv_event {
>  };
>  
>  struct etnaviv_cmdbuf_suballoc;
> -struct etnaviv_cmdbuf;
>  struct regulator;
>  struct clk;
>  
> @@ -102,6 +102,7 @@ struct etnaviv_gpu {
>  	bool initialized;
>  
>  	/* 'ring'-buffer: */
> +	struct etnaviv_vram_mapping cmdbuf_mapping;
>  	struct etnaviv_cmdbuf buffer;
>  	int exec_state;
>  
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> index 731275999a57..dd81376724d7 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
> @@ -334,52 +334,72 @@ void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
>  		etnaviv_iommuv2_restore(gpu);
>  }
>  
> -int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
> -				  struct drm_mm_node *vram_node, size_t size,
> -				  u32 *iova)
> +int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu *mmu,
> +				  struct etnaviv_vram_mapping *mapping,
> +				  u32 memory_base, dma_addr_t paddr,
> +				  size_t size)
>  {
> -	struct etnaviv_iommu *mmu = gpu->mmu;
> +	mutex_lock(&mmu->lock);
>  
> +	/*
> +	 * For MMUv1 we don't add the suballoc region to the pagetables, as
> +	 * those GPUs can only work with cmdbufs accessed through the linear
> +	 * window. Instead we manufacture a mapping to make it look uniform
> +	 * to the upper layers.
> +	 */
>  	if (mmu->version == ETNAVIV_IOMMU_V1) {
> -		*iova = paddr - gpu->memory_base;
> -		return 0;
> +		mapping->iova = paddr - memory_base;
> +		list_add_tail(&mapping->mmu_node, &mmu->mappings);
>  	} else {
> +		struct drm_mm_node *node = &mapping->vram_node;
>  		int ret;
>  
> -		mutex_lock(&mmu->lock);
> -		ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
> +		ret = etnaviv_iommu_find_iova(mmu, node, size);
>  		if (ret < 0) {
>  			mutex_unlock(&mmu->lock);
>  			return ret;
>  		}
> -		ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
> -					 size, ETNAVIV_PROT_READ);
> +
> +		mapping->iova = node->start;
> +		ret = etnaviv_domain_map(mmu->domain, node->start, paddr, size,
> +					 ETNAVIV_PROT_READ);
> +
>  		if (ret < 0) {
> -			drm_mm_remove_node(vram_node);
> +			drm_mm_remove_node(node);
>  			mutex_unlock(&mmu->lock);
>  			return ret;
>  		}
> -		gpu->mmu->need_flush = true;
> -		mutex_unlock(&mmu->lock);
>  
> -		*iova = (u32)vram_node->start;
> -		return 0;
> +		list_add_tail(&mapping->mmu_node, &mmu->mappings);
> +		mmu->need_flush = true;
>  	}
> +
> +	mapping->use = 1;
> +
> +	mutex_unlock(&mmu->lock);
> +
> +	return 0;
>  }
>  
> -void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
> -				   struct drm_mm_node *vram_node, size_t size,
> -				   u32 iova)
> +void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu *mmu,
> +		  struct etnaviv_vram_mapping *mapping)
>  {
> -	struct etnaviv_iommu *mmu = gpu->mmu;
> +	struct drm_mm_node *node = &mapping->vram_node;
>  
> -	if (mmu->version == ETNAVIV_IOMMU_V2) {
> -		mutex_lock(&mmu->lock);
> -		etnaviv_domain_unmap(mmu->domain, iova, size);
> -		drm_mm_remove_node(vram_node);
> -		mutex_unlock(&mmu->lock);
> -	}
> +	if (!mapping->use)
> +		return;
> +
> +	mapping->use = 0;
> +
> +	if (mmu->version == ETNAVIV_IOMMU_V1)
> +		return;
> +
> +	mutex_lock(&mmu->lock);
> +	etnaviv_domain_unmap(mmu->domain, node->start, node->size);
> +	drm_mm_remove_node(node);
> +	mutex_unlock(&mmu->lock);
>  }
> +
>  size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
>  {
>  	return iommu->domain->ops->dump_size(iommu->domain);
> diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
> index a0db17ffb686..fe1c9d6b9334 100644
> --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
> +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h
> @@ -59,12 +59,12 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
>  void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
>  	struct etnaviv_vram_mapping *mapping);
>  
> -int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
> -				  struct drm_mm_node *vram_node, size_t size,
> -				  u32 *iova);
> -void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
> -				   struct drm_mm_node *vram_node, size_t size,
> -				   u32 iova);
> +int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu *mmu,
> +				  struct etnaviv_vram_mapping *mapping,
> +				  u32 memory_base, dma_addr_t paddr,
> +				  size_t size);
> +void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu *mmu,
> +				   struct etnaviv_vram_mapping *mapping);
>  
>  size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu);
>  void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf);
> -- 
> 2.20.1
> 
> _______________________________________________
> etnaviv mailing list
> etnaviv at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/etnaviv


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