[05/10] panfrost: Move BO meta-data out of panfrost_bo

Submitted by Boris Brezillon on July 2, 2019, 1:23 p.m.

Details

Message ID 20190702132353.21049-6-boris.brezillon@collabora.com
State New
Headers show
Series "panfrost: Try to make BO handling more consistent" ( rev: 1 ) in Mesa

Not browsing as part of any series.

Commit Message

Boris Brezillon July 2, 2019, 1:23 p.m.
That's what most (all?) implementation seem to do, and my understanding
is that a BO is just a bunch of memory that can be used for anything GPU
related, not only texture/FB resources.

Let's move those meta data in panfrost_resource so we can use
panfrost_bo for all kind of memory allocation and make BO allocation
more consistent.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
---
 src/gallium/drivers/panfrost/pan_context.c  |  12 +-
 src/gallium/drivers/panfrost/pan_fragment.c |   2 +-
 src/gallium/drivers/panfrost/pan_mfbd.c     |  24 ++--
 src/gallium/drivers/panfrost/pan_resource.c | 126 ++++++++++----------
 src/gallium/drivers/panfrost/pan_resource.h |  24 ++--
 src/gallium/drivers/panfrost/pan_sfbd.c     |   4 +-
 6 files changed, 98 insertions(+), 94 deletions(-)

Patch hide | download patch | download mbox

diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index c78042d412d0..139e0a1140cc 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -797,7 +797,7 @@  panfrost_upload_tex(
         unsigned last_layer = pview->u.tex.last_layer;
 
         /* Lower-bit is set when sampling from colour AFBC */
-        bool is_afbc = rsrc->bo->layout == PAN_AFBC;
+        bool is_afbc = rsrc->layout == PAN_AFBC;
         bool is_zs = rsrc->base.bind & PIPE_BIND_DEPTH_STENCIL;
         unsigned afbc_bit = (is_afbc && !is_zs) ? 1 : 0;
 
@@ -818,7 +818,7 @@  panfrost_upload_tex(
 
                         if (has_manual_stride) {
                                 view->hw.payload[idx++] =
-                                        rsrc->bo->slices[l].stride;
+                                        rsrc->slices[l].stride;
                         }
                 }
         }
@@ -1469,7 +1469,7 @@  panfrost_draw_wallpaper(struct pipe_context *pipe)
         struct panfrost_resource *rsrc = pan_resource(surf->texture);
         unsigned level = surf->u.tex.level;
 
-        if (!rsrc->bo->slices[level].initialized)
+        if (!rsrc->slices[level].initialized)
                 return;
 
         /* Save the batch */
@@ -2203,7 +2203,7 @@  panfrost_create_sampler_view(
 
         unsigned usage2_layout = 0x10;
 
-        switch (prsrc->bo->layout) {
+        switch (prsrc->layout) {
                 case PAN_AFBC:
                         usage2_layout |= 0x8 | 0x4;
                         break;
@@ -2226,9 +2226,9 @@  panfrost_create_sampler_view(
         unsigned first_level = template->u.tex.first_level;
         unsigned last_level = template->u.tex.last_level;
 
-        if (prsrc->bo->layout == PAN_LINEAR) {
+        if (prsrc->layout == PAN_LINEAR) {
                 for (unsigned l = first_level; l <= last_level; ++l) {
-                        unsigned actual_stride = prsrc->bo->slices[l].stride;
+                        unsigned actual_stride = prsrc->slices[l].stride;
                         unsigned width = u_minify(texture->width0, l);
                         unsigned comp_stride = width * bytes_per_pixel;
 
diff --git a/src/gallium/drivers/panfrost/pan_fragment.c b/src/gallium/drivers/panfrost/pan_fragment.c
index 5dbca021141e..ed8677d1afdd 100644
--- a/src/gallium/drivers/panfrost/pan_fragment.c
+++ b/src/gallium/drivers/panfrost/pan_fragment.c
@@ -36,7 +36,7 @@  panfrost_initialize_surface(struct pipe_surface *surf)
         unsigned level = surf->u.tex.level;
         struct panfrost_resource *rsrc = pan_resource(surf->texture);
 
-        rsrc->bo->slices[level].initialized = true;
+        rsrc->slices[level].initialized = true;
 }
 
 /* Generate a fragment job. This should be called once per frame. (According to
diff --git a/src/gallium/drivers/panfrost/pan_mfbd.c b/src/gallium/drivers/panfrost/pan_mfbd.c
index b209ecbf580a..b435d20b7582 100644
--- a/src/gallium/drivers/panfrost/pan_mfbd.c
+++ b/src/gallium/drivers/panfrost/pan_mfbd.c
@@ -128,7 +128,7 @@  panfrost_mfbd_set_cbuf(
         unsigned level = surf->u.tex.level;
         unsigned first_layer = surf->u.tex.first_layer;
         assert(surf->u.tex.last_layer == first_layer);
-        int stride = rsrc->bo->slices[level].stride;
+        int stride = rsrc->slices[level].stride;
 
         mali_ptr base = panfrost_get_texture_address(rsrc, level, first_layer);
 
@@ -136,18 +136,18 @@  panfrost_mfbd_set_cbuf(
 
         /* Now, we set the layout specific pieces */
 
-        if (rsrc->bo->layout == PAN_LINEAR) {
+        if (rsrc->layout == PAN_LINEAR) {
                 rt->format.block = MALI_MFBD_BLOCK_LINEAR;
                 rt->framebuffer = base;
                 rt->framebuffer_stride = stride / 16;
-        } else if (rsrc->bo->layout == PAN_TILED) {
+        } else if (rsrc->layout == PAN_TILED) {
                 rt->format.block = MALI_MFBD_BLOCK_TILED;
                 rt->framebuffer = base;
                 rt->framebuffer_stride = stride;
-        } else if (rsrc->bo->layout == PAN_AFBC) {
+        } else if (rsrc->layout == PAN_AFBC) {
                 rt->format.block = MALI_MFBD_BLOCK_AFBC;
 
-                unsigned header_size = rsrc->bo->slices[level].header_size;
+                unsigned header_size = rsrc->slices[level].header_size;
 
                 rt->framebuffer = base + header_size;
                 rt->afbc.metadata = base;
@@ -173,11 +173,11 @@  panfrost_mfbd_set_zsbuf(
         unsigned level = surf->u.tex.level;
         assert(surf->u.tex.first_layer == 0);
 
-        unsigned offset = rsrc->bo->slices[level].offset;
+        unsigned offset = rsrc->slices[level].offset;
 
-        if (rsrc->bo->layout == PAN_AFBC) {
+        if (rsrc->layout == PAN_AFBC) {
                 mali_ptr base = rsrc->bo->gpu + offset;
-                unsigned header_size = rsrc->bo->slices[level].header_size;
+                unsigned header_size = rsrc->slices[level].header_size;
 
                 fb->mfbd_flags |= MALI_MFBD_EXTRA;
 
@@ -194,8 +194,8 @@  panfrost_mfbd_set_zsbuf(
 
                 fbx->ds_afbc.zero1 = 0x10009;
                 fbx->ds_afbc.padding = 0x1000;
-        } else if (rsrc->bo->layout == PAN_LINEAR) {
-                int stride = rsrc->bo->slices[level].stride;
+        } else if (rsrc->layout == PAN_LINEAR) {
+                int stride = rsrc->slices[level].stride;
                 fb->mfbd_flags |= MALI_MFBD_EXTRA;
 
                 fbx->flags |= MALI_EXTRA_PRESENT | MALI_EXTRA_ZS | 0x1;
@@ -328,9 +328,9 @@  panfrost_mfbd_fragment(struct panfrost_context *ctx, bool has_draws)
                 struct panfrost_resource *rsrc = pan_resource(surf->texture);
                 struct panfrost_bo *bo = rsrc->bo;
 
-                if (bo->checksummed) {
+                if (rsrc->checksummed) {
                         unsigned level = surf->u.tex.level;
-                        struct panfrost_slice *slice = &bo->slices[level];
+                        struct panfrost_slice *slice = &rsrc->slices[level];
 
                         fb.mfbd_flags |= MALI_MFBD_EXTRA;
                         fbx.flags |= MALI_EXTRA_PRESENT;
diff --git a/src/gallium/drivers/panfrost/pan_resource.c b/src/gallium/drivers/panfrost/pan_resource.c
index 680b98a6cac3..8901aeee09b1 100644
--- a/src/gallium/drivers/panfrost/pan_resource.c
+++ b/src/gallium/drivers/panfrost/pan_resource.c
@@ -71,8 +71,8 @@  panfrost_resource_from_handle(struct pipe_screen *pscreen,
         prsc->screen = pscreen;
 
 	rsc->bo = panfrost_drm_import_bo(screen, whandle);
-	rsc->bo->slices[0].stride = whandle->stride;
-        rsc->bo->slices[0].initialized = true;
+	rsc->slices[0].stride = whandle->stride;
+	rsc->slices[0].initialized = true;
 
 	if (screen->ro) {
 		rsc->scanout =
@@ -103,7 +103,7 @@  panfrost_resource_get_handle(struct pipe_screen *pscreen,
 			return TRUE;
 
 		handle->handle = rsrc->bo->gem_handle;
-		handle->stride = rsrc->bo->slices[0].stride;
+		handle->stride = rsrc->slices[0].stride;
 		return TRUE;
 	} else if (handle->type == WINSYS_HANDLE_TYPE_FD) {
                 if (scanout) {
@@ -122,7 +122,7 @@  panfrost_resource_get_handle(struct pipe_screen *pscreen,
                         return TRUE;
                 } else
 			return panfrost_drm_export_bo(screen, rsrc->bo->gem_handle,
-                                                      rsrc->bo->slices[0].stride,
+                                                      rsrc->slices[0].stride,
                                                       handle);
 	}
 
@@ -237,12 +237,13 @@  panfrost_compute_checksum_sizes(
 /* Setup the mip tree given a particular layout, possibly with checksumming */
 
 static void
-panfrost_setup_slices(const struct pipe_resource *tmpl, struct panfrost_bo *bo)
+panfrost_setup_slices(struct panfrost_resource *pres, size_t *bo_size)
 {
-        unsigned width = tmpl->width0;
-        unsigned height = tmpl->height0;
-        unsigned depth = tmpl->depth0;
-        unsigned bytes_per_pixel = util_format_get_blocksize(tmpl->format);
+        struct pipe_resource *res = &pres->base;
+        unsigned width = res->width0;
+        unsigned height = res->height0;
+        unsigned depth = res->depth0;
+        unsigned bytes_per_pixel = util_format_get_blocksize(res->format);
 
         assert(depth > 0);
 
@@ -251,24 +252,24 @@  panfrost_setup_slices(const struct pipe_resource *tmpl, struct panfrost_bo *bo)
          * necessary, but we're not *that* pressed for memory and it
          * makes code a lot simpler */
 
-        bool renderable = tmpl->bind &
+        bool renderable = res->bind &
                 (PIPE_BIND_RENDER_TARGET | PIPE_BIND_DEPTH_STENCIL);
-        bool afbc = bo->layout == PAN_AFBC;
-        bool tiled = bo->layout == PAN_TILED;
+        bool afbc = pres->layout == PAN_AFBC;
+        bool tiled = pres->layout == PAN_TILED;
         bool should_align = renderable || tiled;
 
         /* We don't know how to specify a 2D stride for 3D textures */
 
         bool can_align_stride =
-                tmpl->target != PIPE_TEXTURE_3D;
+                res->target != PIPE_TEXTURE_3D;
 
         should_align &= can_align_stride;
 
         unsigned offset = 0;
         unsigned size_2d = 0;
 
-        for (unsigned l = 0; l <= tmpl->last_level; ++l) {
-                struct panfrost_slice *slice = &bo->slices[l];
+        for (unsigned l = 0; l <= res->last_level; ++l) {
+                struct panfrost_slice *slice = &pres->slices[l];
 
                 unsigned effective_width = width;
                 unsigned effective_height = height;
@@ -287,7 +288,7 @@  panfrost_setup_slices(const struct pipe_resource *tmpl, struct panfrost_bo *bo)
                 unsigned stride = bytes_per_pixel * effective_width;
 
                 /* ..but cache-line align it for performance */
-                if (can_align_stride && bo->layout == PAN_LINEAR)
+                if (can_align_stride && pres->layout == PAN_LINEAR)
                         stride = ALIGN(stride, 64);
 
                 slice->stride = stride;
@@ -311,7 +312,7 @@  panfrost_setup_slices(const struct pipe_resource *tmpl, struct panfrost_bo *bo)
                 offset += slice_full_size;
 
                 /* Add a checksum region if necessary */
-                if (bo->checksummed) {
+                if (pres->checksummed) {
                         slice->checksum_offset = offset;
 
                         unsigned size = panfrost_compute_checksum_sizes(
@@ -325,27 +326,26 @@  panfrost_setup_slices(const struct pipe_resource *tmpl, struct panfrost_bo *bo)
                 depth = u_minify(depth, 1);
         }
 
-        assert(tmpl->array_size);
+        assert(res->array_size);
 
-        if (tmpl->target != PIPE_TEXTURE_3D) {
+        if (res->target != PIPE_TEXTURE_3D) {
                 /* Arrays and cubemaps have the entire miptree duplicated */
 
-                bo->cubemap_stride = ALIGN(offset, 64);
-                bo->size = ALIGN(bo->cubemap_stride * tmpl->array_size, 4096);
+                pres->cubemap_stride = ALIGN(offset, 64);
+                *bo_size = ALIGN(pres->cubemap_stride * res->array_size, 4096);
         } else {
                 /* 3D strides across the 2D layers */
-                assert(tmpl->array_size == 1);
+                assert(res->array_size == 1);
 
-                bo->cubemap_stride = size_2d;
-                bo->size = ALIGN(offset, 4096);
+                pres->cubemap_stride = size_2d;
+                *bo_size = ALIGN(offset, 4096);
         }
 }
 
-static struct panfrost_bo *
-panfrost_create_bo(struct panfrost_screen *screen, const struct pipe_resource *template)
+static void
+panfrost_resource_create_bo(struct panfrost_screen *screen, struct panfrost_resource *pres)
 {
-	struct panfrost_bo *bo = rzalloc(screen, struct panfrost_bo);
-        pipe_reference_init(&bo->reference, 1);
+	struct pipe_resource *res = &pres->base;
 
         /* Based on the usage, figure out what storing will be used. There are
          * various tradeoffs:
@@ -364,35 +364,39 @@  panfrost_create_bo(struct panfrost_screen *screen, const struct pipe_resource *t
 
         /* Tiling textures is almost always faster, unless we only use it once */
 
-        bool is_texture = (template->bind & PIPE_BIND_SAMPLER_VIEW);
-        bool is_2d = template->depth0 == 1 && template->array_size == 1;
-        bool is_streaming = (template->usage != PIPE_USAGE_STREAM);
+        bool is_texture = (res->bind & PIPE_BIND_SAMPLER_VIEW);
+        bool is_2d = res->depth0 == 1 && res->array_size == 1;
+        bool is_streaming = (res->usage != PIPE_USAGE_STREAM);
 
         bool should_tile = is_streaming && is_texture && is_2d;
 
         /* Depth/stencil can't be tiled, only linear or AFBC */
-        should_tile &= !(template->bind & PIPE_BIND_DEPTH_STENCIL);
+        should_tile &= !(res->bind & PIPE_BIND_DEPTH_STENCIL);
 
         /* FBOs we would like to checksum, if at all possible */
-        bool can_checksum = !(template->bind & (PIPE_BIND_SCANOUT | PIPE_BIND_SHARED));
-        bool should_checksum = template->bind & PIPE_BIND_RENDER_TARGET;
+        bool can_checksum = !(res->bind & (PIPE_BIND_SCANOUT | PIPE_BIND_SHARED));
+        bool should_checksum = res->bind & PIPE_BIND_RENDER_TARGET;
 
-        bo->checksummed = can_checksum && should_checksum;
+        pres->checksummed = can_checksum && should_checksum;
 
         /* Set the layout appropriately */
-        bo->layout = should_tile ? PAN_TILED : PAN_LINEAR;
+        pres->layout = should_tile ? PAN_TILED : PAN_LINEAR;
 
-        panfrost_setup_slices(template, bo);
+        size_t bo_size;
+
+        panfrost_setup_slices(pres, &bo_size);
 
         struct panfrost_memory mem;
+        struct panfrost_bo *bo = rzalloc(screen, struct panfrost_bo);
 
-        panfrost_drm_allocate_slab(screen, &mem, bo->size / 4096, true, 0, 0, 0);
+        pipe_reference_init(&bo->reference, 1);
+        panfrost_drm_allocate_slab(screen, &mem, bo_size / 4096, true, 0, 0, 0);
 
         bo->cpu = mem.cpu;
         bo->gpu = mem.gpu;
         bo->gem_handle = mem.gem_handle;
-
-        return bo;
+	bo->size = bo_size;
+	pres->bo = bo;
 }
 
 static struct pipe_resource *
@@ -428,7 +432,7 @@  panfrost_resource_create(struct pipe_screen *screen,
 
         util_range_init(&so->valid_buffer_range);
 
-        so->bo = panfrost_create_bo(pscreen, template);
+        panfrost_resource_create_bo(pscreen, so);
         return (struct pipe_resource *)so;
 }
 
@@ -538,7 +542,7 @@  panfrost_transfer_map(struct pipe_context *pctx,
                 }
         }
 
-        if (bo->layout != PAN_LINEAR) {
+        if (rsrc->layout != PAN_LINEAR) {
                 /* Non-linear resources need to be indirectly mapped */
 
                 if (usage & PIPE_TRANSFER_MAP_DIRECTLY)
@@ -549,35 +553,35 @@  panfrost_transfer_map(struct pipe_context *pctx,
                 transfer->map = rzalloc_size(transfer, transfer->base.layer_stride * box->depth);
                 assert(box->depth == 1);
 
-                if ((usage & PIPE_TRANSFER_READ) && bo->slices[level].initialized) {
-                        if (bo->layout == PAN_AFBC) {
+                if ((usage & PIPE_TRANSFER_READ) && rsrc->slices[level].initialized) {
+                        if (rsrc->layout == PAN_AFBC) {
                                 DBG("Unimplemented: reads from AFBC");
-                        } else if (bo->layout == PAN_TILED) {
+                        } else if (rsrc->layout == PAN_TILED) {
                                 panfrost_load_tiled_image(
                                                 transfer->map,
-                                                bo->cpu + bo->slices[level].offset,
+                                                bo->cpu + rsrc->slices[level].offset,
                                                 box,
                                                 transfer->base.stride,
-                                                bo->slices[level].stride,
+                                                rsrc->slices[level].stride,
                                                 util_format_get_blocksize(resource->format));
                         }
                 }
 
                 return transfer->map;
         } else {
-                transfer->base.stride = bo->slices[level].stride;
-                transfer->base.layer_stride = bo->cubemap_stride;
+                transfer->base.stride = rsrc->slices[level].stride;
+                transfer->base.layer_stride = rsrc->cubemap_stride;
 
                 /* By mapping direct-write, we're implicitly already
                  * initialized (maybe), so be conservative */
 
                 if ((usage & PIPE_TRANSFER_WRITE) && (usage & PIPE_TRANSFER_MAP_DIRECTLY))
-                        bo->slices[level].initialized = true;
+                        rsrc->slices[level].initialized = true;
 
                 return bo->cpu
-                        + bo->slices[level].offset
-                        + transfer->base.box.z * bo->cubemap_stride
-                        + transfer->base.box.y * bo->slices[level].stride
+                        + rsrc->slices[level].offset
+                        + transfer->base.box.z * rsrc->cubemap_stride
+                        + transfer->base.box.y * rsrc->slices[level].stride
                         + transfer->base.box.x * bytes_per_pixel;
         }
 }
@@ -596,18 +600,18 @@  panfrost_transfer_unmap(struct pipe_context *pctx,
 
                 if (transfer->usage & PIPE_TRANSFER_WRITE) {
                         unsigned level = transfer->level;
-                        bo->slices[level].initialized = true;
+                        prsrc->slices[level].initialized = true;
 
-                        if (bo->layout == PAN_AFBC) {
+                        if (prsrc->layout == PAN_AFBC) {
                                 DBG("Unimplemented: writes to AFBC\n");
-                        } else if (bo->layout == PAN_TILED) {
+                        } else if (prsrc->layout == PAN_TILED) {
                                 assert(transfer->box.depth == 1);
 
                                 panfrost_store_tiled_image(
-                                                bo->cpu + bo->slices[level].offset,
+                                                bo->cpu + prsrc->slices[level].offset,
                                                 trans->map,
                                                 &transfer->box,
-                                                bo->slices[level].stride,
+                                                prsrc->slices[level].stride,
                                                 transfer->stride,
                                                 util_format_get_blocksize(prsrc->base.format));
                         }
@@ -719,7 +723,7 @@  panfrost_generate_mipmap(
 
         assert(rsrc->bo);
         for (unsigned l = base_level + 1; l <= last_level; ++l)
-                rsrc->bo->slices[l].initialized = false;
+                rsrc->slices[l].initialized = false;
 
         /* Beyond that, we just delegate the hard stuff. We're careful to
          * include flushes on both ends to make sure the data is really valid.
@@ -757,8 +761,8 @@  panfrost_get_texture_address(
                 struct panfrost_resource *rsrc,
                 unsigned level, unsigned face)
 {
-        unsigned level_offset = rsrc->bo->slices[level].offset;
-        unsigned face_offset = face * rsrc->bo->cubemap_stride;
+        unsigned level_offset = rsrc->slices[level].offset;
+        unsigned face_offset = face * rsrc->cubemap_stride;
 
         return rsrc->bo->gpu + level_offset + face_offset;
 }
diff --git a/src/gallium/drivers/panfrost/pan_resource.h b/src/gallium/drivers/panfrost/pan_resource.h
index 003211b8c4a7..d1f0ffc84e15 100644
--- a/src/gallium/drivers/panfrost/pan_resource.h
+++ b/src/gallium/drivers/panfrost/pan_resource.h
@@ -60,9 +60,6 @@  struct panfrost_slice {
 struct panfrost_bo {
         struct pipe_reference reference;
 
-        /* Description of the mip levels */
-        struct panfrost_slice slices[MAX_MIP_LEVELS];
-
         /* Mapping for the entire object (all levels) */
         uint8_t *cpu;
 
@@ -72,15 +69,6 @@  struct panfrost_bo {
         /* Size of all entire trees */
         size_t size;
 
-        /* Distance from tree to tree */
-        unsigned cubemap_stride;
-
-        /* Internal layout (tiled?) */
-        enum panfrost_memory_layout layout;
-
-        /* Is transaciton elimination enabled? */
-        bool checksummed;
-
         int gem_handle;
 };
 
@@ -99,6 +87,18 @@  struct panfrost_resource {
         struct panfrost_resource *separate_stencil;
 
         struct util_range valid_buffer_range;
+
+        /* Description of the mip levels */
+        struct panfrost_slice slices[MAX_MIP_LEVELS];
+
+        /* Distance from tree to tree */
+        unsigned cubemap_stride;
+
+        /* Internal layout (tiled?) */
+        enum panfrost_memory_layout layout;
+
+        /* Is transaciton elimination enabled? */
+        bool checksummed;
 };
 
 static inline struct panfrost_resource *
diff --git a/src/gallium/drivers/panfrost/pan_sfbd.c b/src/gallium/drivers/panfrost/pan_sfbd.c
index c9b0414b50c2..eccae888e826 100644
--- a/src/gallium/drivers/panfrost/pan_sfbd.c
+++ b/src/gallium/drivers/panfrost/pan_sfbd.c
@@ -91,11 +91,11 @@  panfrost_sfbd_set_cbuf(
 {
         struct panfrost_resource *rsrc = pan_resource(surf->texture);
 
-        signed stride = rsrc->bo->slices[0].stride;
+        signed stride = rsrc->slices[0].stride;
 
         fb->format = panfrost_sfbd_format(surf);
 
-        if (rsrc->bo->layout == PAN_LINEAR) {
+        if (rsrc->layout == PAN_LINEAR) {
                 fb->framebuffer = rsrc->bo->gpu;
                 fb->stride = stride;
         } else {

Comments


On Tue, 2 Jul 2019 06:53:56 -0700
Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> wrote:

> Oh, not controversial at all, I'm quite happy with this!
> Just a question -- I remember some panfrost_resources didn't have a bo
> but had a winsys thingy instead. How does that interact?

Didn't notice any specific test for the !rsrc->bo case, so it's probably
gone. Note that winsys handles are converted into BOs through using
panfrost_drm_import_bo().