[PATCH v2 2/8] drm/etnaviv: split out cmdbuf mapping into address space
Philipp Zabel
p.zabel at pengutronix.de
Wed Jul 24 13:51:52 UTC 2019
On Fri, 2019-07-05 at 19:17 +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.
>
> 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 {
[...]
> + list_add_tail(&mapping->mmu_node, &mmu->mappings);
This is the same in both branches and could be moved below.
> + mmu->need_flush = true;
> }
> +
> + mapping->use = 1;
> +
> + mutex_unlock(&mmu->lock);
> +
> + return 0;
> }
>
[...]
Reviewed-by: Philipp Zabel <p.zabel at pengutronix.de>
regards
Philipp
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