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Date: Wed, 30 Mar 2022 02:12:05 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Rob Clark <robdclark@...il.com>
Cc: dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
linux-arm-msm@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
Sean Paul <sean@...rly.run>,
Abhinav Kumar <quic_abhinavk@...cinc.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jonathan Marek <jonathan@...ek.ca>,
Akhil P Oommen <quic_akhilpo@...cinc.com>,
Viresh Kumar <viresh.kumar@...aro.org>,
Dan Carpenter <dan.carpenter@...cle.com>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] drm/msm/gem: Drop PAGE_SHIFT for address space mm
On Wed, 30 Mar 2022 at 02:00, Rob Clark <robdclark@...il.com> wrote:
>
> From: Rob Clark <robdclark@...omium.org>
>
> Get rid of all the unnecessary conversion between address/size and page
> offsets. It just confuses things.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 2 +-
> drivers/gpu/drm/msm/msm_gem.c | 5 ++---
> drivers/gpu/drm/msm/msm_gem.h | 4 ++--
> drivers/gpu/drm/msm/msm_gem_vma.c | 16 ++++++++--------
> 4 files changed, 13 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index 3e325e2a2b1b..9f76f5b15759 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -1172,7 +1172,7 @@ static int a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu, struct a6xx_gmu_bo *bo,
> return PTR_ERR(bo->obj);
>
> ret = msm_gem_get_and_pin_iova_range(bo->obj, gmu->aspace, &bo->iova,
> - range_start >> PAGE_SHIFT, range_end >> PAGE_SHIFT);
> + range_start, range_end);
> if (ret) {
> drm_gem_object_put(bo->obj);
> return ret;
> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
> index f96d1dc72021..f4b68bb28a4d 100644
> --- a/drivers/gpu/drm/msm/msm_gem.c
> +++ b/drivers/gpu/drm/msm/msm_gem.c
> @@ -392,7 +392,7 @@ static int get_iova_locked(struct drm_gem_object *obj,
> if (IS_ERR(vma))
> return PTR_ERR(vma);
>
> - ret = msm_gem_init_vma(aspace, vma, obj->size >> PAGE_SHIFT,
> + ret = msm_gem_init_vma(aspace, vma, obj->size,
> range_start, range_end);
> if (ret) {
> del_vma(vma);
> @@ -434,8 +434,7 @@ static int msm_gem_pin_iova(struct drm_gem_object *obj,
> if (IS_ERR(pages))
> return PTR_ERR(pages);
>
> - ret = msm_gem_map_vma(aspace, vma, prot,
> - msm_obj->sgt, obj->size >> PAGE_SHIFT);
> + ret = msm_gem_map_vma(aspace, vma, prot, msm_obj->sgt, obj->size);
>
> if (!ret)
> msm_obj->pin_count++;
> diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h
> index 1b7f0f0b88bf..090c3b1a6d9a 100644
> --- a/drivers/gpu/drm/msm/msm_gem.h
> +++ b/drivers/gpu/drm/msm/msm_gem.h
> @@ -59,7 +59,7 @@ struct msm_gem_vma {
> };
>
> int msm_gem_init_vma(struct msm_gem_address_space *aspace,
> - struct msm_gem_vma *vma, int npages,
> + struct msm_gem_vma *vma, int size,
> u64 range_start, u64 range_end);
> bool msm_gem_vma_inuse(struct msm_gem_vma *vma);
> void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
> @@ -68,7 +68,7 @@ void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
> struct msm_gem_vma *vma);
> int msm_gem_map_vma(struct msm_gem_address_space *aspace,
> struct msm_gem_vma *vma, int prot,
> - struct sg_table *sgt, int npages);
> + struct sg_table *sgt, int size);
> void msm_gem_close_vma(struct msm_gem_address_space *aspace,
> struct msm_gem_vma *vma);
>
> diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
> index dc2ae097805e..4949899f1fc7 100644
> --- a/drivers/gpu/drm/msm/msm_gem_vma.c
> +++ b/drivers/gpu/drm/msm/msm_gem_vma.c
> @@ -46,7 +46,7 @@ bool msm_gem_vma_inuse(struct msm_gem_vma *vma)
> void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
> struct msm_gem_vma *vma)
> {
> - unsigned size = vma->node.size << PAGE_SHIFT;
> + unsigned size = vma->node.size;
>
> /* Print a message if we try to purge a vma in use */
> if (GEM_WARN_ON(msm_gem_vma_inuse(vma)))
> @@ -73,9 +73,8 @@ void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
> int
> msm_gem_map_vma(struct msm_gem_address_space *aspace,
> struct msm_gem_vma *vma, int prot,
> - struct sg_table *sgt, int npages)
> + struct sg_table *sgt, int size)
> {
> - unsigned size = npages << PAGE_SHIFT;
> int ret = 0;
>
> if (GEM_WARN_ON(!vma->iova))
> @@ -120,7 +119,7 @@ void msm_gem_close_vma(struct msm_gem_address_space *aspace,
>
> /* Initialize a new vma and allocate an iova for it */
> int msm_gem_init_vma(struct msm_gem_address_space *aspace,
> - struct msm_gem_vma *vma, int npages,
> + struct msm_gem_vma *vma, int size,
> u64 range_start, u64 range_end)
> {
> int ret;
> @@ -129,14 +128,15 @@ int msm_gem_init_vma(struct msm_gem_address_space *aspace,
> return -EBUSY;
>
> spin_lock(&aspace->lock);
> - ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node, npages, 0,
> - 0, range_start, range_end, 0);
> + ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node,
> + size, PAGE_SIZE, 0,
> + range_start, range_end, 0);
> spin_unlock(&aspace->lock);
>
> if (ret)
> return ret;
>
> - vma->iova = vma->node.start << PAGE_SHIFT;
> + vma->iova = vma->node.start;
> vma->mapped = false;
>
> kref_get(&aspace->kref);
> @@ -161,7 +161,7 @@ msm_gem_address_space_create(struct msm_mmu *mmu, const char *name,
> aspace->name = name;
> aspace->mmu = mmu;
>
> - drm_mm_init(&aspace->mm, va_start >> PAGE_SHIFT, size >> PAGE_SHIFT);
> + drm_mm_init(&aspace->mm, va_start, size);
>
> kref_init(&aspace->kref);
>
> --
> 2.35.1
>
--
With best wishes
Dmitry
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