On Mon, Jul 19, 2021 at 3:18 AM Matthew Auld
<matthew.william.auld@xxxxxxxxx> wrote:
>
> On Fri, 16 Jul 2021 at 15:14, Jason Ekstrand <jason@xxxxxxxxxxxxxx> wrote:
> >
> > Since we don't allow changing the set of regions after creation, we can
> > make ext_set_placements() build up the region set directly in the
> > create_ext and assign it to the object later. This is similar to what
> > we did for contexts with the proto-context only simpler because there's
> > no funny object shuffling. This will be used in the next patch to allow
> > us to de-duplicate a bunch of code. Also, since we know the maximum
> > number of regions up-front, we can use a fixed-size temporary array for
> > the regions. This simplifies memory management a bit for this new
> > delayed approach.
> >
> > v2 (Matthew Auld):
> > - Get rid of MAX_N_PLACEMENTS
> > - Drop kfree(placements) from set_placements()
> >
> > Signed-off-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
> > Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/gem/i915_gem_create.c | 81 ++++++++++++----------
> > 1 file changed, 45 insertions(+), 36 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c
> > index 51f92e4b1a69d..5766749a449c0 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_create.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c
> > @@ -27,10 +27,13 @@ static u32 object_max_page_size(struct drm_i915_gem_object *obj)
> > return max_page_size;
> > }
> >
> > -static void object_set_placements(struct drm_i915_gem_object *obj,
> > - struct intel_memory_region **placements,
> > - unsigned int n_placements)
> > +static int object_set_placements(struct drm_i915_gem_object *obj,
> > + struct intel_memory_region **placements,
> > + unsigned int n_placements)
> > {
> > + struct intel_memory_region **arr;
> > + unsigned int i;
> > +
> > GEM_BUG_ON(!n_placements);
> >
> > /*
> > @@ -44,9 +47,20 @@ static void object_set_placements(struct drm_i915_gem_object *obj,
> > obj->mm.placements = &i915->mm.regions[mr->id];
> > obj->mm.n_placements = 1;
> > } else {
> > - obj->mm.placements = placements;
> > + arr = kmalloc_array(n_placements,
> > + sizeof(struct intel_memory_region *),
> > + GFP_KERNEL);
> > + if (!arr)
> > + return -ENOMEM;
> > +
> > + for (i = 0; i < n_placements; i++)
> > + arr[i] = placements[i];
> > +
> > + obj->mm.placements = arr;
> > obj->mm.n_placements = n_placements;
> > }
> > +
> > + return 0;
> > }
> >
> > static int i915_gem_publish(struct drm_i915_gem_object *obj,
> > @@ -148,7 +162,9 @@ i915_gem_dumb_create(struct drm_file *file,
> > return -ENOMEM;
> >
> > mr = intel_memory_region_by_type(to_i915(dev), mem_type);
> > - object_set_placements(obj, &mr, 1);
> > + ret = object_set_placements(obj, &mr, 1);
> > + if (ret)
> > + goto object_free;
> >
> > ret = i915_gem_setup(obj, args->size);
> > if (ret)
> > @@ -184,7 +200,9 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
> > return -ENOMEM;
> >
> > mr = intel_memory_region_by_type(i915, INTEL_MEMORY_SYSTEM);
> > - object_set_placements(obj, &mr, 1);
> > + ret = object_set_placements(obj, &mr, 1);
> > + if (ret)
> > + goto object_free;
> >
> > ret = i915_gem_setup(obj, args->size);
> > if (ret)
> > @@ -199,7 +217,8 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
> >
> > struct create_ext {
> > struct drm_i915_private *i915;
> > - struct drm_i915_gem_object *vanilla_object;
> > + struct intel_memory_region *placements[INTEL_REGION_UNKNOWN];
> > + unsigned int n_placements;
> > };
> >
> > static void repr_placements(char *buf, size_t size,
> > @@ -230,8 +249,7 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
> > struct drm_i915_private *i915 = ext_data->i915;
> > struct drm_i915_gem_memory_class_instance __user *uregions =
> > u64_to_user_ptr(args->regions);
> > - struct drm_i915_gem_object *obj = ext_data->vanilla_object;
> > - struct intel_memory_region **placements;
> > + struct intel_memory_region *placements[INTEL_REGION_UNKNOWN];
> > u32 mask;
> > int i, ret = 0;
> >
> > @@ -245,6 +263,8 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
> > ret = -EINVAL;
> > }
> >
> > + BUILD_BUG_ON(ARRAY_SIZE(i915->mm.regions) != ARRAY_SIZE(placements));
> > + BUILD_BUG_ON(ARRAY_SIZE(ext_data->placements) != ARRAY_SIZE(placements));
> > if (args->num_regions > ARRAY_SIZE(i915->mm.regions)) {
> > drm_dbg(&i915->drm, "num_regions is too large\n");
> > ret = -EINVAL;
> > @@ -253,21 +273,13 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
> > if (ret)
> > return ret;
> >
> > - placements = kmalloc_array(args->num_regions,
> > - sizeof(struct intel_memory_region *),
> > - GFP_KERNEL);
> > - if (!placements)
> > - return -ENOMEM;
> > -
> > mask = 0;
> > for (i = 0; i < args->num_regions; i++) {
> > struct drm_i915_gem_memory_class_instance region;
> > struct intel_memory_region *mr;
> >
> > - if (copy_from_user(®ion, uregions, sizeof(region))) {
> > - ret = -EFAULT;
> > - goto out_free;
> > - }
> > + if (copy_from_user(®ion, uregions, sizeof(region)))
> > + return -EFAULT;
> >
> > mr = intel_memory_region_lookup(i915,
> > region.memory_class,
> > @@ -293,14 +305,13 @@ static int set_placements(struct drm_i915_gem_create_ext_memory_regions *args,
> > ++uregions;
> > }
> >
> > - if (obj->mm.placements) {
> > + if (ext_data->n_placements) {
> > ret = -EINVAL;
> > goto out_dump;
> > }
> >
> > - object_set_placements(obj, placements, args->num_regions);
> > - if (args->num_regions == 1)
> > - kfree(placements);
> > + for (i = 0; i < args->num_regions; i++)
> > + ext_data->placements[i] = placements[i];
>
> I guess here we forget to set the ext_data->n_placements, which would
> explain the CI failure.
What CI failure are you referring to?
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