| Message ID | 20190809120424.32679-4-l.stach@pengutronix.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3,1/8] drm/etnaviv: simplify unbind checks | expand |
On Fri, 2019-08-09 at 14:04 +0200, Lucas Stach wrote: > If a MMU is shared between multiple GPUs, all of them need to flush their > TLBs, so a single marker that gets reset on the first flush won't do. > Replace the flush marker with a sequence number, so that it's possible to > check if the TLB is in sync with the current page table state for each GPU. > > Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> regards Philipp
Hi, On Fri, Aug 09, 2019 at 02:04:20PM +0200, Lucas Stach wrote: > If a MMU is shared between multiple GPUs, all of them need to flush their > TLBs, so a single marker that gets reset on the first flush won't do. > Replace the flush marker with a sequence number, so that it's possible to > check if the TLB is in sync with the current page table state for each GPU. > > Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Reviewed-by: Guido Günther <agx@sigxcpu.org> > --- > v3: Avoid flush sequence update racing with the flush. > --- > drivers/gpu/drm/etnaviv/etnaviv_buffer.c | 10 ++++++---- > drivers/gpu/drm/etnaviv/etnaviv_gpu.h | 1 + > drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 6 +++--- > drivers/gpu/drm/etnaviv/etnaviv_mmu.h | 2 +- > 4 files changed, 11 insertions(+), 8 deletions(-) > > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c > index 6400a88cd778..a3cdb20bfc5f 100644 > --- a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c > +++ b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c > @@ -315,6 +315,8 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, > u32 return_target, return_dwords; > u32 link_target, link_dwords; > bool switch_context = gpu->exec_state != exec_state; > + unsigned int new_flush_seq = READ_ONCE(gpu->mmu->flush_seq); > + bool need_flush = gpu->flush_seq != new_flush_seq; > > lockdep_assert_held(&gpu->lock); > > @@ -329,14 +331,14 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, > * need to append a mmu flush load state, followed by a new > * link to this buffer - a total of four additional words. > */ > - if (gpu->mmu->need_flush || switch_context) { > + if (need_flush || switch_context) { > u32 target, extra_dwords; > > /* link command */ > extra_dwords = 1; > > /* flush command */ > - if (gpu->mmu->need_flush) { > + if (need_flush) { > if (gpu->mmu->version == ETNAVIV_IOMMU_V1) > extra_dwords += 1; > else > @@ -349,7 +351,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, > > target = etnaviv_buffer_reserve(gpu, buffer, extra_dwords); > > - if (gpu->mmu->need_flush) { > + if (need_flush) { > /* Add the MMU flush */ > if (gpu->mmu->version == ETNAVIV_IOMMU_V1) { > CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU, > @@ -369,7 +371,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, > SYNC_RECIPIENT_PE); > } > > - gpu->mmu->need_flush = false; > + gpu->flush_seq = new_flush_seq; > } > > if (switch_context) { > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h > index 933c8d016f11..96380942cd8c 100644 > --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h > @@ -137,6 +137,7 @@ struct etnaviv_gpu { > int irq; > > struct etnaviv_iommu *mmu; > + unsigned int flush_seq; > > /* Power Control: */ > struct clk *clk_bus; > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c > index 09f516093b91..bbd1624a3df8 100644 > --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c > +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c > @@ -263,7 +263,7 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu, > } > > list_add_tail(&mapping->mmu_node, &mmu->mappings); > - mmu->need_flush = true; > + mmu->flush_seq++; > unlock: > mutex_unlock(&mmu->lock); > > @@ -282,7 +282,7 @@ void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu, > etnaviv_iommu_remove_mapping(mmu, mapping); > > list_del(&mapping->mmu_node); > - mmu->need_flush = true; > + mmu->flush_seq++; > mutex_unlock(&mmu->lock); > } > > @@ -369,7 +369,7 @@ int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu *mmu, > return ret; > } > > - mmu->need_flush = true; > + mmu->flush_seq++; > } > > list_add_tail(&mapping->mmu_node, &mmu->mappings); > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h > index fe1c9d6b9334..34afe25df9ca 100644 > --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h > +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h > @@ -48,7 +48,7 @@ struct etnaviv_iommu { > struct mutex lock; > struct list_head mappings; > struct drm_mm mm; > - bool need_flush; > + unsigned int flush_seq; > }; > > struct etnaviv_gem_object; > -- > 2.20.1 > > _______________________________________________ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c index 6400a88cd778..a3cdb20bfc5f 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_buffer.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_buffer.c @@ -315,6 +315,8 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, u32 return_target, return_dwords; u32 link_target, link_dwords; bool switch_context = gpu->exec_state != exec_state; + unsigned int new_flush_seq = READ_ONCE(gpu->mmu->flush_seq); + bool need_flush = gpu->flush_seq != new_flush_seq; lockdep_assert_held(&gpu->lock); @@ -329,14 +331,14 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, * need to append a mmu flush load state, followed by a new * link to this buffer - a total of four additional words. */ - if (gpu->mmu->need_flush || switch_context) { + if (need_flush || switch_context) { u32 target, extra_dwords; /* link command */ extra_dwords = 1; /* flush command */ - if (gpu->mmu->need_flush) { + if (need_flush) { if (gpu->mmu->version == ETNAVIV_IOMMU_V1) extra_dwords += 1; else @@ -349,7 +351,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, target = etnaviv_buffer_reserve(gpu, buffer, extra_dwords); - if (gpu->mmu->need_flush) { + if (need_flush) { /* Add the MMU flush */ if (gpu->mmu->version == ETNAVIV_IOMMU_V1) { CMD_LOAD_STATE(buffer, VIVS_GL_FLUSH_MMU, @@ -369,7 +371,7 @@ void etnaviv_buffer_queue(struct etnaviv_gpu *gpu, u32 exec_state, SYNC_RECIPIENT_PE); } - gpu->mmu->need_flush = false; + gpu->flush_seq = new_flush_seq; } if (switch_context) { diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h index 933c8d016f11..96380942cd8c 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.h +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.h @@ -137,6 +137,7 @@ struct etnaviv_gpu { int irq; struct etnaviv_iommu *mmu; + unsigned int flush_seq; /* Power Control: */ struct clk *clk_bus; diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c index 09f516093b91..bbd1624a3df8 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c @@ -263,7 +263,7 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu, } list_add_tail(&mapping->mmu_node, &mmu->mappings); - mmu->need_flush = true; + mmu->flush_seq++; unlock: mutex_unlock(&mmu->lock); @@ -282,7 +282,7 @@ void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu, etnaviv_iommu_remove_mapping(mmu, mapping); list_del(&mapping->mmu_node); - mmu->need_flush = true; + mmu->flush_seq++; mutex_unlock(&mmu->lock); } @@ -369,7 +369,7 @@ int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu *mmu, return ret; } - mmu->need_flush = true; + mmu->flush_seq++; } list_add_tail(&mapping->mmu_node, &mmu->mappings); diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h index fe1c9d6b9334..34afe25df9ca 100644 --- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.h +++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.h @@ -48,7 +48,7 @@ struct etnaviv_iommu { struct mutex lock; struct list_head mappings; struct drm_mm mm; - bool need_flush; + unsigned int flush_seq; }; struct etnaviv_gem_object;
If a MMU is shared between multiple GPUs, all of them need to flush their TLBs, so a single marker that gets reset on the first flush won't do. Replace the flush marker with a sequence number, so that it's possible to check if the TLB is in sync with the current page table state for each GPU. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> --- v3: Avoid flush sequence update racing with the flush. --- drivers/gpu/drm/etnaviv/etnaviv_buffer.c | 10 ++++++---- drivers/gpu/drm/etnaviv/etnaviv_gpu.h | 1 + drivers/gpu/drm/etnaviv/etnaviv_mmu.c | 6 +++--- drivers/gpu/drm/etnaviv/etnaviv_mmu.h | 2 +- 4 files changed, 11 insertions(+), 8 deletions(-)