Re: [PATCH v2 6/6] drm/msm/a6xx: Add support for per-instance pagetables

[Rob Clark]

On Sat, Jun 27, 2020 at 12:56 PM Rob Clark <robdclark@xxxxxxxxx> wrote:
>
> On Fri, Jun 26, 2020 at 1:04 PM Jordan Crouse <jcrouse@xxxxxxxxxxxxxx> wrote:
> >
> > Add support for using per-instance pagetables if all the dependencies are
> > available.
> >
> > Signed-off-by: Jordan Crouse <jcrouse@xxxxxxxxxxxxxx>
> > ---
> >
> >  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 43 +++++++++++++++++++++++++++
> >  drivers/gpu/drm/msm/msm_ringbuffer.h  |  1 +
> >  2 files changed, 44 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> > index aa53f47b7e8b..95ed2ceac121 100644
> > --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> > +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> > @@ -79,6 +79,34 @@ static void get_stats_counter(struct msm_ringbuffer *ring, u32 counter,
> >         OUT_RING(ring, upper_32_bits(iova));
> >  }
> >
> > +static void a6xx_set_pagetable(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
> > +               struct msm_file_private *ctx)
> > +{
> > +       phys_addr_t ttbr;
> > +       u32 asid;
> > +
> > +       if (msm_iommu_pagetable_params(ctx->aspace->mmu, &ttbr, &asid))
> > +               return;
> > +
> > +       /* Execute the table update */
> > +       OUT_PKT7(ring, CP_SMMU_TABLE_UPDATE, 4);
> > +       OUT_RING(ring, lower_32_bits(ttbr));
> > +       OUT_RING(ring, (((u64) asid) << 48) | upper_32_bits(ttbr));
> > +       /* CONTEXTIDR is currently unused */
> > +       OUT_RING(ring, 0);
> > +       /* CONTEXTBANK is currently unused */
> > +       OUT_RING(ring, 0);
> > +
> > +       /*
> > +        * Write the new TTBR0 to the memstore. This is good for debugging.
> > +        */
> > +       OUT_PKT7(ring, CP_MEM_WRITE, 4);
> > +       OUT_RING(ring, lower_32_bits(rbmemptr(ring, ttbr0)));
> > +       OUT_RING(ring, upper_32_bits(rbmemptr(ring, ttbr0)));
> > +       OUT_RING(ring, lower_32_bits(ttbr));
> > +       OUT_RING(ring, (((u64) asid) << 48) | upper_32_bits(ttbr));
> > +}
> > +
> >  static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
> >         struct msm_file_private *ctx)
> >  {
> > @@ -89,6 +117,8 @@ static void a6xx_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
> >         struct msm_ringbuffer *ring = submit->ring;
> >         unsigned int i;
> >
> > +       a6xx_set_pagetable(gpu, ring, ctx);
> > +
> >         get_stats_counter(ring, REG_A6XX_RBBM_PERFCTR_CP_0_LO,
> >                 rbmemptr_stats(ring, index, cpcycles_start));
> >
> > @@ -872,6 +902,18 @@ static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu)
> >         return (unsigned long)busy_time;
> >  }
> >
> > +struct msm_gem_address_space *a6xx_address_space_instance(struct msm_gpu *gpu)
> > +{
> > +       struct msm_mmu *mmu;
> > +
> > +       mmu = msm_iommu_pagetable_create(gpu->aspace->mmu);
> > +       if (IS_ERR(mmu))
> > +               return msm_gem_address_space_get(gpu->aspace);
> > +
> > +       return msm_gem_address_space_create(mmu,
> > +               "gpu", 0x100000000ULL, 0x1ffffffffULL);
> > +}
> > +
> >  static const struct adreno_gpu_funcs funcs = {
> >         .base = {
> >                 .get_param = adreno_get_param,
> > @@ -895,6 +937,7 @@ static const struct adreno_gpu_funcs funcs = {
> >                 .gpu_state_put = a6xx_gpu_state_put,
> >  #endif
> >                 .create_address_space = adreno_iommu_create_address_space,
> > +               .address_space_instance = a6xx_address_space_instance,
>
> Hmm, maybe instead of .address_space_instance, something like
> .create_context_address_space?
>
> Since like .create_address_space, it is creating an address space..
> the difference is that it is a per context/process aspace..
>


or maybe just .create_pgtable and return the 'struct msm_mmu' (which
is itself starting to become less of a great name)..

The only other thing a6xx_address_space_instance() adds is knowing
where the split is between the kernel and user pgtables, and I suppose
that isn't a thing that would really be changing between gens?

BR,
-R

> BR,
> -R
>
> >         },
> >         .get_timestamp = a6xx_get_timestamp,
> >  };
> > diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h
> > index 7764373d0ed2..0987d6bf848c 100644
> > --- a/drivers/gpu/drm/msm/msm_ringbuffer.h
> > +++ b/drivers/gpu/drm/msm/msm_ringbuffer.h
> > @@ -31,6 +31,7 @@ struct msm_rbmemptrs {
> >         volatile uint32_t fence;
> >
> >         volatile struct msm_gpu_submit_stats stats[MSM_GPU_SUBMIT_STATS_COUNT];
> > +       volatile u64 ttbr0;
> >  };
> >
> >  struct msm_ringbuffer {
> > --
> > 2.17.1
> >