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Re: [Xen-devel] [PATCH] drm/xen-front: Remove CMA support

To: xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, airlied@xxxxxxxx, daniel.vetter@xxxxxxxxx, seanpaul@xxxxxxxxxxxx, gustavo@xxxxxxxxxxx, jgross@xxxxxxxx, boris.ostrovsky@xxxxxxxxxx, konrad.wilk@xxxxxxxxxx, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
From: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>
Date: Wed, 18 Apr 2018 10:27:18 +0300
Delivery-date: Wed, 18 Apr 2018 07:27:40 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 04/17/2018 12:08 PM, Oleksandr Andrushchenko wrote:

On 04/17/2018 12:04 PM, Daniel Vetter wrote:

On Tue, Apr 17, 2018 at 10:40:12AM +0300, Oleksandr Andrushchenko wrote:

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

Even if xen-front allocates its buffers from contiguous memory
those are still not contiguous in PA space, e.g. the buffer is only
contiguous in IPA space.
The only use-case for this mode was if xen-front is used to allocate
dumb buffers which later be used by some other driver requiring
contiguous memory, but there is no currently such a use-case or
it can be worked around with xen-front.

Please also mention the nents confusion here, and the patch thatfixes it.

Or just outright take the commit message from my patch with all the
details:

ok, if you don't mind then I'll use your commit message entirely

     drm/xen: Dissable CMA support

It turns out this was only needed to paper over a bug inthe CMA

     helpers, which was addressed in
          commit 998fb1a0f478b83492220ff79583bf9ad538bdd8
     Author: Liviu Dudau <Liviu.Dudau@xxxxxxx>
     Date:   Fri Nov 10 13:33:10 2017 +0000

drm: gem_cma_helper.c: Allow importing of contiguousscatterlists with nents > 1

          Without this the following pipeline didn't work:
          domU:
     1. xen-front allocates a non-contig buffer
     2. creates grants out of it
          dom0:

3. converts the grants into a dma-buf. Since they're non-contig,the

     scatter-list is huge.
     4. imports it into rcar-du, which requires dma-contig memory for
     scanout.

-> On this given platform there's an IOMMU, so in theorythis should

     work. But in practice this failed, because of the huge number of sg

entries, even though the IOMMU driver mapped it all into adma-contig

     range.

With a guest-contig buffer allocated in step 1, thisproblem doesn't

     exist. But there's technically no reason to require guest-contig
     memory for xen buffer sharing using grants.

With the commit message improved:

Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx>

Thank you,
I'll wait for a day and apply to drm-misc-next if this is ok

applied to drm-misc-next

Signed-off-by: Oleksandr Andrushchenko<oleksandr_andrushchenko@xxxxxxxx>

Suggested-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
  Documentation/gpu/xen-front.rst             | 12 ----
  drivers/gpu/drm/xen/Kconfig                 | 13 ----
  drivers/gpu/drm/xen/Makefile                |  9 +--
  drivers/gpu/drm/xen/xen_drm_front.c         | 62 +++-------------
  drivers/gpu/drm/xen/xen_drm_front.h         | 42 ++---------
  drivers/gpu/drm/xen/xen_drm_front_gem.c     | 12 +---
  drivers/gpu/drm/xen/xen_drm_front_gem.h     |  3 -

drivers/gpu/drm/xen/xen_drm_front_gem_cma.c | 79---------------------

  drivers/gpu/drm/xen/xen_drm_front_shbuf.c   | 22 ------
  drivers/gpu/drm/xen/xen_drm_front_shbuf.h   |  8 ---
  10 files changed, 21 insertions(+), 241 deletions(-)
  delete mode 100644 drivers/gpu/drm/xen/xen_drm_front_gem_cma.c

diff --git a/Documentation/gpu/xen-front.rstb/Documentation/gpu/xen-front.rst

index 009d942386c5..d988da7d1983 100644
--- a/Documentation/gpu/xen-front.rst
+++ b/Documentation/gpu/xen-front.rst
@@ -18,18 +18,6 @@ Buffers allocated by the frontend driver
  .. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
     :doc: Buffers allocated by the frontend driver
  -With GEM CMA helpers
-~~~~~~~~~~~~~~~~~~~~
-
-.. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
-   :doc: With GEM CMA helpers
-
-Without GEM CMA helpers
-~~~~~~~~~~~~~~~~~~~~~~~
-
-.. kernel-doc:: drivers/gpu/drm/xen/xen_drm_front.h
-   :doc: Without GEM CMA helpers
-
  Buffers allocated by the backend
  --------------------------------

diff --git a/drivers/gpu/drm/xen/Kconfigb/drivers/gpu/drm/xen/Kconfig

index 4f4abc91f3b6..4cca160782ab 100644
--- a/drivers/gpu/drm/xen/Kconfig
+++ b/drivers/gpu/drm/xen/Kconfig
@@ -15,16 +15,3 @@ config DRM_XEN_FRONTEND
      help
        Choose this option if you want to enable a para-virtualized
        frontend DRM/KMS driver for Xen guest OSes.
-
-config DRM_XEN_FRONTEND_CMA
-    bool "Use DRM CMA to allocate dumb buffers"
-    depends on DRM_XEN_FRONTEND
-    select DRM_KMS_CMA_HELPER
-    select DRM_GEM_CMA_HELPER
-    help
-      Use DRM CMA helpers to allocate display buffers.
-      This is useful for the use-cases when guest driver needs to
-      share or export buffers to other drivers which only expect
-      contiguous buffers.
-      Note: in this mode driver cannot use buffers allocated
-      by the backend.

diff --git a/drivers/gpu/drm/xen/Makefileb/drivers/gpu/drm/xen/Makefile

index 352730dc6c13..712afff5ffc3 100644
--- a/drivers/gpu/drm/xen/Makefile
+++ b/drivers/gpu/drm/xen/Makefile
@@ -5,12 +5,7 @@ drm_xen_front-objs := xen_drm_front.o \
                xen_drm_front_conn.o \
                xen_drm_front_evtchnl.o \
                xen_drm_front_shbuf.o \
-              xen_drm_front_cfg.o
-
-ifeq ($(CONFIG_DRM_XEN_FRONTEND_CMA),y)
-    drm_xen_front-objs += xen_drm_front_gem_cma.o
-else
-    drm_xen_front-objs += xen_drm_front_gem.o
-endif
+              xen_drm_front_cfg.o \
+              xen_drm_front_gem.o
    obj-$(CONFIG_DRM_XEN_FRONTEND) += drm_xen_front.o

diff --git a/drivers/gpu/drm/xen/xen_drm_front.cb/drivers/gpu/drm/xen/xen_drm_front.c

index 4a08b77f1c9e..1b0ea9ac330e 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -12,7 +12,6 @@
  #include <drm/drm_atomic_helper.h>
  #include <drm/drm_crtc_helper.h>
  #include <drm/drm_gem.h>
-#include <drm/drm_gem_cma_helper.h>
    #include <linux/of_device.h>

@@ -167,10 +166,9 @@ int xen_drm_front_mode_set(structxen_drm_front_drm_pipeline *pipeline,

      return ret;
  }
  -static int be_dbuf_create_int(struct xen_drm_front_info *front_info,
+int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
                    u64 dbuf_cookie, u32 width, u32 height,
-                  u32 bpp, u64 size, struct page **pages,
-                  struct sg_table *sgt)
+                  u32 bpp, u64 size, struct page **pages)
  {
      struct xen_drm_front_evtchnl *evtchnl;
      struct xen_drm_front_shbuf *shbuf;

@@ -187,7 +185,6 @@ static int be_dbuf_create_int(structxen_drm_front_info *front_info,

      buf_cfg.xb_dev = front_info->xb_dev;
      buf_cfg.pages = pages;
      buf_cfg.size = size;
-    buf_cfg.sgt = sgt;
      buf_cfg.be_alloc = front_info->cfg.be_alloc;
        shbuf = xen_drm_front_shbuf_alloc(&buf_cfg);

@@ -237,22 +234,6 @@ static int be_dbuf_create_int(structxen_drm_front_info *front_info,

      return ret;
  }

-int xen_drm_front_dbuf_create_from_sgt(struct xen_drm_front_info*front_info,

-                       u64 dbuf_cookie, u32 width, u32 height,
-                       u32 bpp, u64 size, struct sg_table *sgt)
-{
-    return be_dbuf_create_int(front_info, dbuf_cookie, width, height,
-                  bpp, size, NULL, sgt);
-}
-

-int xen_drm_front_dbuf_create_from_pages(struct xen_drm_front_info*front_info,

-                     u64 dbuf_cookie, u32 width, u32 height,
-                     u32 bpp, u64 size, struct page **pages)
-{
-    return be_dbuf_create_int(front_info, dbuf_cookie, width, height,
-                  bpp, size, pages, NULL);
-}
-

static int xen_drm_front_dbuf_destroy(struct xen_drm_front_info*front_info,

                        u64 dbuf_cookie)
  {

@@ -434,24 +415,11 @@ static int xen_drm_drv_dumb_create(structdrm_file *filp,

          goto fail;
      }
  -    /*
-     * In case of CONFIG_DRM_XEN_FRONTEND_CMA gem_obj is constructed
-     * via DRM CMA helpers and doesn't have ->pages allocated

- * (xendrm_gem_get_pages will return NULL), but instead canprovide

-     * sg table
-     */
-    if (xen_drm_front_gem_get_pages(obj))

- ret =xen_drm_front_dbuf_create_from_pages(drm_info->front_info,

-                xen_drm_front_dbuf_to_cookie(obj),
-                args->width, args->height, args->bpp,
-                args->size,
-                xen_drm_front_gem_get_pages(obj));
-    else
-        ret = xen_drm_front_dbuf_create_from_sgt(drm_info->front_info,
-                xen_drm_front_dbuf_to_cookie(obj),
-                args->width, args->height, args->bpp,
-                args->size,
-                xen_drm_front_gem_get_sg_table(obj));
+    ret = xen_drm_front_dbuf_create(drm_info->front_info,
+                    xen_drm_front_dbuf_to_cookie(obj),
+                    args->width, args->height, args->bpp,
+                    args->size,
+                    xen_drm_front_gem_get_pages(obj));
      if (ret)
          goto fail_backend;

@@ -523,11 +491,7 @@ static const struct file_operationsxen_drm_dev_fops = {

      .poll           = drm_poll,
      .read           = drm_read,
      .llseek         = no_llseek,
-#ifdef CONFIG_DRM_XEN_FRONTEND_CMA
-    .mmap           = drm_gem_cma_mmap,
-#else
      .mmap           = xen_drm_front_gem_mmap,
-#endif
  };
    static const struct vm_operations_struct xen_drm_drv_vm_ops = {
@@ -547,6 +511,9 @@ static struct drm_driver xen_drm_driver = {
      .gem_prime_export          = drm_gem_prime_export,
      .gem_prime_import_sg_table = xen_drm_front_gem_import_sg_table,
      .gem_prime_get_sg_table    = xen_drm_front_gem_get_sg_table,
+    .gem_prime_vmap            = xen_drm_front_gem_prime_vmap,
+    .gem_prime_vunmap          = xen_drm_front_gem_prime_vunmap,
+    .gem_prime_mmap            = xen_drm_front_gem_prime_mmap,
      .dumb_create               = xen_drm_drv_dumb_create,
      .fops                      = &xen_drm_dev_fops,
      .name                      = "xendrm-du",
@@ -555,15 +522,6 @@ static struct drm_driver xen_drm_driver = {
      .major                     = 1,
      .minor                     = 0,
  -#ifdef CONFIG_DRM_XEN_FRONTEND_CMA
-    .gem_prime_vmap            = drm_gem_cma_prime_vmap,
-    .gem_prime_vunmap          = drm_gem_cma_prime_vunmap,
-    .gem_prime_mmap            = drm_gem_cma_prime_mmap,
-#else
-    .gem_prime_vmap            = xen_drm_front_gem_prime_vmap,
-    .gem_prime_vunmap          = xen_drm_front_gem_prime_vunmap,
-    .gem_prime_mmap            = xen_drm_front_gem_prime_mmap,
-#endif
  };
    static int xen_drm_drv_init(struct xen_drm_front_info *front_info)

diff --git a/drivers/gpu/drm/xen/xen_drm_front.hb/drivers/gpu/drm/xen/xen_drm_front.h

index 16554b2463d8..2c2479b571ae 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.h
+++ b/drivers/gpu/drm/xen/xen_drm_front.h
@@ -23,40 +23,14 @@
   *

* Depending on the requirements for the para-virtualizedenvironment, namely * requirements dictated by the accompanying DRM/(v)GPU driversrunning in both- * host and guest environments, number of operating modes ofpara-virtualized

- * display driver are supported:
- *

- * - display buffers can be allocated by either frontend driver orbackend- * - display buffers can be allocated to be contiguous in memory ornot

- *

- * Note! Frontend driver itself has no dependency on contiguousmemory for

- * its operation.

+ * host and guest environments, display buffers can be allocated byeither

+ * frontend driver or backend.
   */
    /**
   * DOC: Buffers allocated by the frontend driver
   *
- * The below modes of operation are configured at compile-time via
- * frontend driver's kernel configuration:
- */
-
-/**
- * DOC: With GEM CMA helpers
- *

- * This use-case is useful when used with accompanying DRM/vGPUdriver in- * guest domain which was designed to only work with contiguousbuffers,- * e.g. DRM driver based on GEM CMA helpers: such drivers can onlyimport

- * contiguous PRIME buffers, thus requiring frontend driver to provide
- * such. In order to implement this mode of operation para-virtualized
- * frontend driver can be configured to use GEM CMA helpers.
- */
-
-/**
- * DOC: Without GEM CMA helpers
- *

- * If accompanying drivers can cope with non-contiguous memorythen, to

- * lower pressure on CMA subsystem of the kernel, driver can allocate
- * buffers from system memory.

+ * In this mode of operation driver allocates buffers from systemmemory.

* Note! If used with accompanying DRM/(v)GPU drivers this mode ofoperation * may require IOMMU support on the platform, so accompanyingDRM/vGPU@@ -164,13 +138,9 @@ int xen_drm_front_mode_set(structxen_drm_front_drm_pipeline *pipeline,

                 u32 x, u32 y, u32 width, u32 height,
                 u32 bpp, u64 fb_cookie);

-int xen_drm_front_dbuf_create_from_sgt(struct xen_drm_front_info*front_info,

-                       u64 dbuf_cookie, u32 width, u32 height,
-                       u32 bpp, u64 size, struct sg_table *sgt);
-

-int xen_drm_front_dbuf_create_from_pages(struct xen_drm_front_info*front_info,

-                     u64 dbuf_cookie, u32 width, u32 height,
-                     u32 bpp, u64 size, struct page **pages);
+int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
+                  u64 dbuf_cookie, u32 width, u32 height,
+                  u32 bpp, u64 size, struct page **pages);
    int xen_drm_front_fb_attach(struct xen_drm_front_info *front_info,
                  u64 dbuf_cookie, u64 fb_cookie, u32 width,

diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.cb/drivers/gpu/drm/xen/xen_drm_front_gem.c

index 3b04a2269d7a..c85bfe7571cb 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c

@@ -210,15 +210,9 @@ xen_drm_front_gem_import_sg_table(structdrm_device *dev,

      if (ret < 0)
          return ERR_PTR(ret);
  -    /*
-     * N.B. Although we have an API to create display buffer from sgt
-     * we use pages API, because we still need those for GEM handling,
-     * e.g. for mapping etc.
-     */
-    ret = xen_drm_front_dbuf_create_from_pages(drm_info->front_info,
- xen_drm_front_dbuf_to_cookie(&xen_obj->base),
-                           0, 0, 0, size,
-                           xen_obj->pages);
+    ret = xen_drm_front_dbuf_create(drm_info->front_info,
+ xen_drm_front_dbuf_to_cookie(&xen_obj->base),
+                    0, 0, 0, size, xen_obj->pages);
      if (ret < 0)
          return ERR_PTR(ret);

diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.hb/drivers/gpu/drm/xen/xen_drm_front_gem.h

index 55e531f5a763..d5ab734fdafe 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.h
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.h

@@ -27,8 +27,6 @@ struct page **xen_drm_front_gem_get_pages(structdrm_gem_object *obj); void xen_drm_front_gem_free_object_unlocked(structdrm_gem_object *gem_obj);

  -#ifndef CONFIG_DRM_XEN_FRONTEND_CMA
-

int xen_drm_front_gem_mmap(struct file *filp, structvm_area_struct *vma);

    void *xen_drm_front_gem_prime_vmap(struct drm_gem_object *gem_obj);

@@ -38,6 +36,5 @@ void xen_drm_front_gem_prime_vunmap(structdrm_gem_object *gem_obj,

    int xen_drm_front_gem_prime_mmap(struct drm_gem_object *gem_obj,
                   struct vm_area_struct *vma);
-#endif
    #endif /* __XEN_DRM_FRONT_GEM_H */

diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem_cma.cb/drivers/gpu/drm/xen/xen_drm_front_gem_cma.c

deleted file mode 100644
index ba30a4bc2a39..000000000000
--- a/drivers/gpu/drm/xen/xen_drm_front_gem_cma.c
+++ /dev/null
@@ -1,79 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0 OR MIT
-
-/*
- *  Xen para-virtual DRM device
- *
- * Copyright (C) 2016-2018 EPAM Systems Inc.
- *
- * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
- */
-
-#include <drm/drmP.h>
-#include <drm/drm_gem.h>
-#include <drm/drm_fb_cma_helper.h>
-#include <drm/drm_gem_cma_helper.h>
-
-#include "xen_drm_front.h"
-#include "xen_drm_front_gem.h"
-
-struct drm_gem_object *
-xen_drm_front_gem_import_sg_table(struct drm_device *dev,
-                  struct dma_buf_attachment *attach,
-                  struct sg_table *sgt)
-{
-    struct xen_drm_front_drm_info *drm_info = dev->dev_private;
-    struct drm_gem_object *gem_obj;
-    struct drm_gem_cma_object *cma_obj;
-    int ret;
-
-    gem_obj = drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
-    if (IS_ERR_OR_NULL(gem_obj))
-        return gem_obj;
-
-    cma_obj = to_drm_gem_cma_obj(gem_obj);
-
-    ret = xen_drm_front_dbuf_create_from_sgt(drm_info->front_info,
- xen_drm_front_dbuf_to_cookie(gem_obj),
-                         0, 0, 0, gem_obj->size,
- drm_gem_cma_prime_get_sg_table(gem_obj));
-    if (ret < 0)
-        return ERR_PTR(ret);
-
-    DRM_DEBUG("Imported CMA buffer of size %zu\n", gem_obj->size);
-
-    return gem_obj;
-}
-

-struct sg_table *xen_drm_front_gem_get_sg_table(structdrm_gem_object *gem_obj)

-{
-    return drm_gem_cma_prime_get_sg_table(gem_obj);
-}
-

-struct drm_gem_object *xen_drm_front_gem_create(struct drm_device*dev,

-                        size_t size)
-{
-    struct xen_drm_front_drm_info *drm_info = dev->dev_private;
-    struct drm_gem_cma_object *cma_obj;
-
-    if (drm_info->front_info->cfg.be_alloc) {
-        /* This use-case is not yet supported and probably won't be */

- DRM_ERROR("Backend allocated buffers and CMA helpers arenot supported at the same time\n");

-        return ERR_PTR(-EINVAL);
-    }
-
-    cma_obj = drm_gem_cma_create(dev, size);
-    if (IS_ERR_OR_NULL(cma_obj))
-        return ERR_CAST(cma_obj);
-
-    return &cma_obj->base;
-}
-

-void xen_drm_front_gem_free_object_unlocked(struct drm_gem_object*gem_obj)

-{
-    drm_gem_cma_free_object(gem_obj);
-}
-

-struct page **xen_drm_front_gem_get_pages(struct drm_gem_object*gem_obj)

-{
-    return NULL;
-}

diff --git a/drivers/gpu/drm/xen/xen_drm_front_shbuf.cb/drivers/gpu/drm/xen/xen_drm_front_shbuf.c

index 19914dde4b3d..d5705251a0d6 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_shbuf.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_shbuf.c

@@ -89,10 +89,6 @@ void xen_drm_front_shbuf_free(structxen_drm_front_shbuf *buf)

      }
      kfree(buf->grefs);
      kfree(buf->directory);
-    if (buf->sgt) {
-        sg_free_table(buf->sgt);
-        kvfree(buf->pages);
-    }
      kfree(buf);
  }

@@ -350,17 +346,6 @@ static int grant_references(structxen_drm_front_shbuf *buf)

    static int alloc_storage(struct xen_drm_front_shbuf *buf)
  {
-    if (buf->sgt) {
-        buf->pages = kvmalloc_array(buf->num_pages,
-                        sizeof(struct page *), GFP_KERNEL);
-        if (!buf->pages)
-            return -ENOMEM;
-
-        if (drm_prime_sg_to_page_addr_arrays(buf->sgt, buf->pages,
-                             NULL, buf->num_pages) < 0)
-            return -EINVAL;
-    }
-

buf->grefs = kcalloc(buf->num_grefs, sizeof(*buf->grefs),GFP_KERNEL);

      if (!buf->grefs)
          return -ENOMEM;

@@ -396,12 +381,6 @@ xen_drm_front_shbuf_alloc(structxen_drm_front_shbuf_cfg *cfg)

      struct xen_drm_front_shbuf *buf;
      int ret;
  -    /* either pages or sgt, not both */
-    if (unlikely(cfg->pages && cfg->sgt)) {

- DRM_ERROR("Cannot handle buffer allocation with both pagesand sg table provided\n");

-        return NULL;
-    }
-
      buf = kzalloc(sizeof(*buf), GFP_KERNEL);
      if (!buf)
          return NULL;

@@ -413,7 +392,6 @@ xen_drm_front_shbuf_alloc(structxen_drm_front_shbuf_cfg *cfg)

        buf->xb_dev = cfg->xb_dev;
      buf->num_pages = DIV_ROUND_UP(cfg->size, PAGE_SIZE);
-    buf->sgt = cfg->sgt;
      buf->pages = cfg->pages;
        buf->ops->calc_num_grefs(buf);

diff --git a/drivers/gpu/drm/xen/xen_drm_front_shbuf.hb/drivers/gpu/drm/xen/xen_drm_front_shbuf.h

index 8c037fd7608b..7545c692539e 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_shbuf.h
+++ b/drivers/gpu/drm/xen/xen_drm_front_shbuf.h
@@ -29,16 +29,9 @@ struct xen_drm_front_shbuf {
      grant_ref_t *grefs;
      unsigned char *directory;
  -    /*

- * there are 2 ways to provide backing storage for this sharedbuffer:

-     * either pages or sgt. if buffer created from sgt then we own
-     * the pages and must free those ourselves on closure
-     */
      int num_pages;
      struct page **pages;
  -    struct sg_table *sgt;
-
      struct xenbus_device *xb_dev;

/* these are the ops used internally depending on be_allocmode */

@@ -52,7 +45,6 @@ struct xen_drm_front_shbuf_cfg {
      struct xenbus_device *xb_dev;
      size_t size;
      struct page **pages;
-    struct sg_table *sgt;
      bool be_alloc;
  };
  --
2.17.0

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References:
- [Xen-devel] [PATCH] drm/xen-front: Remove CMA support
  - From: Oleksandr Andrushchenko
- Re: [Xen-devel] [PATCH] drm/xen-front: Remove CMA support
  - From: Daniel Vetter
- Re: [Xen-devel] [PATCH] drm/xen-front: Remove CMA support
  - From: Oleksandr Andrushchenko

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