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Re: [Xen-devel] [PATCH v2 2/3] drm/xen-front: Use Xen common shared buffer implementation



bump

On 12/5/18 10:20 AM, Oleksandr Andrushchenko wrote:
Hello, Daniel!

Could you please ack/nack the patch, so either we can merge the

series or I can address your comments if any

Thank you,

Oleksandr

On 11/30/18 9:42 AM, Oleksandr Andrushchenko wrote:
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

Use page directory based shared buffer implementation
now available as common code for Xen frontend drivers.

Remove flushing of shared buffer on page flip as this
workaround needs a proper fix.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---
  drivers/gpu/drm/xen/Kconfig               |   1 +
  drivers/gpu/drm/xen/Makefile              |   1 -
  drivers/gpu/drm/xen/xen_drm_front.c       |  65 ++--
  drivers/gpu/drm/xen/xen_drm_front_gem.c   |   1 -
  drivers/gpu/drm/xen/xen_drm_front_shbuf.c | 414 ----------------------
  drivers/gpu/drm/xen/xen_drm_front_shbuf.h |  64 ----
  6 files changed, 26 insertions(+), 520 deletions(-)
  delete mode 100644 drivers/gpu/drm/xen/xen_drm_front_shbuf.c
  delete mode 100644 drivers/gpu/drm/xen/xen_drm_front_shbuf.h

diff --git a/drivers/gpu/drm/xen/Kconfig b/drivers/gpu/drm/xen/Kconfig
index 4cca160782ab..f969d486855d 100644
--- a/drivers/gpu/drm/xen/Kconfig
+++ b/drivers/gpu/drm/xen/Kconfig
@@ -12,6 +12,7 @@ config DRM_XEN_FRONTEND
      select DRM_KMS_HELPER
      select VIDEOMODE_HELPERS
      select XEN_XENBUS_FRONTEND
+    select XEN_FRONT_PGDIR_SHBUF
      help
        Choose this option if you want to enable a para-virtualized
        frontend DRM/KMS driver for Xen guest OSes.
diff --git a/drivers/gpu/drm/xen/Makefile b/drivers/gpu/drm/xen/Makefile
index 712afff5ffc3..825905f67faa 100644
--- a/drivers/gpu/drm/xen/Makefile
+++ b/drivers/gpu/drm/xen/Makefile
@@ -4,7 +4,6 @@ drm_xen_front-objs := xen_drm_front.o \
                xen_drm_front_kms.o \
                xen_drm_front_conn.o \
                xen_drm_front_evtchnl.o \
-              xen_drm_front_shbuf.o \
                xen_drm_front_cfg.o \
                xen_drm_front_gem.o
  diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
index 6b6d5ab82ec3..4d3d36fc3a5d 100644
--- a/drivers/gpu/drm/xen/xen_drm_front.c
+++ b/drivers/gpu/drm/xen/xen_drm_front.c
@@ -19,6 +19,7 @@
  #include <xen/xen.h>
  #include <xen/xenbus.h>
  +#include <xen/xen-front-pgdir-shbuf.h>
  #include <xen/interface/io/displif.h>
    #include "xen_drm_front.h"
@@ -26,28 +27,20 @@
  #include "xen_drm_front_evtchnl.h"
  #include "xen_drm_front_gem.h"
  #include "xen_drm_front_kms.h"
-#include "xen_drm_front_shbuf.h"
    struct xen_drm_front_dbuf {
      struct list_head list;
      u64 dbuf_cookie;
      u64 fb_cookie;
-    struct xen_drm_front_shbuf *shbuf;
+
+    struct xen_front_pgdir_shbuf shbuf;
  };
  -static int dbuf_add_to_list(struct xen_drm_front_info *front_info,
-                struct xen_drm_front_shbuf *shbuf, u64 dbuf_cookie)
+static void dbuf_add_to_list(struct xen_drm_front_info *front_info,
+                 struct xen_drm_front_dbuf *dbuf, u64 dbuf_cookie)
  {
-    struct xen_drm_front_dbuf *dbuf;
-
-    dbuf = kzalloc(sizeof(*dbuf), GFP_KERNEL);
-    if (!dbuf)
-        return -ENOMEM;
-
      dbuf->dbuf_cookie = dbuf_cookie;
-    dbuf->shbuf = shbuf;
      list_add(&dbuf->list, &front_info->dbuf_list);
-    return 0;
  }
    static struct xen_drm_front_dbuf *dbuf_get(struct list_head *dbuf_list, @@ -62,15 +55,6 @@ static struct xen_drm_front_dbuf *dbuf_get(struct list_head *dbuf_list,
      return NULL;
  }
  -static void dbuf_flush_fb(struct list_head *dbuf_list, u64 fb_cookie)
-{
-    struct xen_drm_front_dbuf *buf, *q;
-
-    list_for_each_entry_safe(buf, q, dbuf_list, list)
-        if (buf->fb_cookie == fb_cookie)
-            xen_drm_front_shbuf_flush(buf->shbuf);
-}
-
  static void dbuf_free(struct list_head *dbuf_list, u64 dbuf_cookie)
  {
      struct xen_drm_front_dbuf *buf, *q;
@@ -78,8 +62,8 @@ static void dbuf_free(struct list_head *dbuf_list, u64 dbuf_cookie)
      list_for_each_entry_safe(buf, q, dbuf_list, list)
          if (buf->dbuf_cookie == dbuf_cookie) {
              list_del(&buf->list);
-            xen_drm_front_shbuf_unmap(buf->shbuf);
-            xen_drm_front_shbuf_free(buf->shbuf);
+            xen_front_pgdir_shbuf_unmap(&buf->shbuf);
+            xen_front_pgdir_shbuf_free(&buf->shbuf);
              kfree(buf);
              break;
          }
@@ -91,8 +75,8 @@ static void dbuf_free_all(struct list_head *dbuf_list)
        list_for_each_entry_safe(buf, q, dbuf_list, list) {
          list_del(&buf->list);
-        xen_drm_front_shbuf_unmap(buf->shbuf);
-        xen_drm_front_shbuf_free(buf->shbuf);
+        xen_front_pgdir_shbuf_unmap(&buf->shbuf);
+        xen_front_pgdir_shbuf_free(&buf->shbuf);
          kfree(buf);
      }
  }
@@ -171,9 +155,9 @@ int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
                    u32 bpp, u64 size, struct page **pages)
  {
      struct xen_drm_front_evtchnl *evtchnl;
-    struct xen_drm_front_shbuf *shbuf;
+    struct xen_drm_front_dbuf *dbuf;
      struct xendispl_req *req;
-    struct xen_drm_front_shbuf_cfg buf_cfg;
+    struct xen_front_pgdir_shbuf_cfg buf_cfg;
      unsigned long flags;
      int ret;
  @@ -181,28 +165,29 @@ int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
      if (unlikely(!evtchnl))
          return -EIO;
  +    dbuf = kzalloc(sizeof(*dbuf), GFP_KERNEL);
+    if (!dbuf)
+        return -ENOMEM;
+
+    dbuf_add_to_list(front_info, dbuf, dbuf_cookie);
+
      memset(&buf_cfg, 0, sizeof(buf_cfg));
      buf_cfg.xb_dev = front_info->xb_dev;
+    buf_cfg.num_pages = DIV_ROUND_UP(size, PAGE_SIZE);
      buf_cfg.pages = pages;
-    buf_cfg.size = size;
+    buf_cfg.pgdir = &dbuf->shbuf;
      buf_cfg.be_alloc = front_info->cfg.be_alloc;
  -    shbuf = xen_drm_front_shbuf_alloc(&buf_cfg);
-    if (IS_ERR(shbuf))
-        return PTR_ERR(shbuf);
-
-    ret = dbuf_add_to_list(front_info, shbuf, dbuf_cookie);
-    if (ret < 0) {
-        xen_drm_front_shbuf_free(shbuf);
-        return ret;
-    }
+    ret = xen_front_pgdir_shbuf_alloc(&buf_cfg);
+    if (ret < 0)
+        goto fail_shbuf_alloc;
        mutex_lock(&evtchnl->u.req.req_io_lock);
        spin_lock_irqsave(&front_info->io_lock, flags);
      req = be_prepare_req(evtchnl, XENDISPL_OP_DBUF_CREATE);
      req->op.dbuf_create.gref_directory =
-            xen_drm_front_shbuf_get_dir_start(shbuf);
+ xen_front_pgdir_shbuf_get_dir_start(&dbuf->shbuf);
      req->op.dbuf_create.buffer_sz = size;
      req->op.dbuf_create.dbuf_cookie = dbuf_cookie;
      req->op.dbuf_create.width = width;
@@ -221,7 +206,7 @@ int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
      if (ret < 0)
          goto fail;
  -    ret = xen_drm_front_shbuf_map(shbuf);
+    ret = xen_front_pgdir_shbuf_map(&dbuf->shbuf);
      if (ret < 0)
          goto fail;
  @@ -230,6 +215,7 @@ int xen_drm_front_dbuf_create(struct xen_drm_front_info *front_info,
    fail:
      mutex_unlock(&evtchnl->u.req.req_io_lock);
+fail_shbuf_alloc:
      dbuf_free(&front_info->dbuf_list, dbuf_cookie);
      return ret;
  }
@@ -358,7 +344,6 @@ int xen_drm_front_page_flip(struct xen_drm_front_info *front_info,
      if (unlikely(conn_idx >= front_info->num_evt_pairs))
          return -EINVAL;
  -    dbuf_flush_fb(&front_info->dbuf_list, fb_cookie);
      evtchnl = &front_info->evt_pairs[conn_idx].req;
        mutex_lock(&evtchnl->u.req.req_io_lock);
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
index c85bfe7571cb..53be4c7dc0a4 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_gem.c
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -22,7 +22,6 @@
  #include <xen/balloon.h>
    #include "xen_drm_front.h"
-#include "xen_drm_front_shbuf.h"
    struct xen_gem_object {
      struct drm_gem_object base;
diff --git a/drivers/gpu/drm/xen/xen_drm_front_shbuf.c b/drivers/gpu/drm/xen/xen_drm_front_shbuf.c
deleted file mode 100644
index d333b67cc1a0..000000000000
--- a/drivers/gpu/drm/xen/xen_drm_front_shbuf.c
+++ /dev/null
@@ -1,414 +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>
-
-#if defined(CONFIG_X86)
-#include <drm/drm_cache.h>
-#endif
-#include <linux/errno.h>
-#include <linux/mm.h>
-
-#include <asm/xen/hypervisor.h>
-#include <xen/balloon.h>
-#include <xen/xen.h>
-#include <xen/xenbus.h>
-#include <xen/interface/io/ring.h>
-#include <xen/interface/io/displif.h>
-
-#include "xen_drm_front.h"
-#include "xen_drm_front_shbuf.h"
-
-struct xen_drm_front_shbuf_ops {
-    /*
-     * Calculate number of grefs required to handle this buffer,
-     * e.g. if grefs are required for page directory only or the buffer
-     * pages as well.
-     */
-    void (*calc_num_grefs)(struct xen_drm_front_shbuf *buf);
-    /* Fill page directory according to para-virtual display protocol. */
-    void (*fill_page_dir)(struct xen_drm_front_shbuf *buf);
-    /* Claim grant references for the pages of the buffer. */
-    int (*grant_refs_for_buffer)(struct xen_drm_front_shbuf *buf,
-                     grant_ref_t *priv_gref_head, int gref_idx);
-    /* Map grant references of the buffer. */
-    int (*map)(struct xen_drm_front_shbuf *buf);
-    /* Unmap grant references of the buffer. */
-    int (*unmap)(struct xen_drm_front_shbuf *buf);
-};
-
-grant_ref_t xen_drm_front_shbuf_get_dir_start(struct xen_drm_front_shbuf *buf)
-{
-    if (!buf->grefs)
-        return GRANT_INVALID_REF;
-
-    return buf->grefs[0];
-}
-
-int xen_drm_front_shbuf_map(struct xen_drm_front_shbuf *buf)
-{
-    if (buf->ops->map)
-        return buf->ops->map(buf);
-
-    /* no need to map own grant references */
-    return 0;
-}
-
-int xen_drm_front_shbuf_unmap(struct xen_drm_front_shbuf *buf)
-{
-    if (buf->ops->unmap)
-        return buf->ops->unmap(buf);
-
-    /* no need to unmap own grant references */
-    return 0;
-}
-
-void xen_drm_front_shbuf_flush(struct xen_drm_front_shbuf *buf)
-{
-#if defined(CONFIG_X86)
-    drm_clflush_pages(buf->pages, buf->num_pages);
-#endif
-}
-
-void xen_drm_front_shbuf_free(struct xen_drm_front_shbuf *buf)
-{
-    if (buf->grefs) {
-        int i;
-
-        for (i = 0; i < buf->num_grefs; i++)
-            if (buf->grefs[i] != GRANT_INVALID_REF)
-                gnttab_end_foreign_access(buf->grefs[i],
-                              0, 0UL);
-    }
-    kfree(buf->grefs);
-    kfree(buf->directory);
-    kfree(buf);
-}
-
-/*
- * number of grefs a page can hold with respect to the
- * struct xendispl_page_directory header
- */
-#define XEN_DRM_NUM_GREFS_PER_PAGE ((PAGE_SIZE - \
-        offsetof(struct xendispl_page_directory, gref)) / \
-        sizeof(grant_ref_t))
-
-static int get_num_pages_dir(struct xen_drm_front_shbuf *buf)
-{
-    /* number of pages the page directory consumes itself */
-    return DIV_ROUND_UP(buf->num_pages, XEN_DRM_NUM_GREFS_PER_PAGE);
-}
-
-static void backend_calc_num_grefs(struct xen_drm_front_shbuf *buf)
-{
-    /* only for pages the page directory consumes itself */
-    buf->num_grefs = get_num_pages_dir(buf);
-}
-
-static void guest_calc_num_grefs(struct xen_drm_front_shbuf *buf)
-{
-    /*
-     * number of pages the page directory consumes itself
-     * plus grefs for the buffer pages
-     */
-    buf->num_grefs = get_num_pages_dir(buf) + buf->num_pages;
-}
-
-#define xen_page_to_vaddr(page) \
-        ((uintptr_t)pfn_to_kaddr(page_to_xen_pfn(page)))
-
-static int backend_unmap(struct xen_drm_front_shbuf *buf)
-{
-    struct gnttab_unmap_grant_ref *unmap_ops;
-    int i, ret;
-
-    if (!buf->pages || !buf->backend_map_handles || !buf->grefs)
-        return 0;
-
-    unmap_ops = kcalloc(buf->num_pages, sizeof(*unmap_ops),
-                GFP_KERNEL);
-    if (!unmap_ops) {
-        DRM_ERROR("Failed to get memory while unmapping\n");
-        return -ENOMEM;
-    }
-
-    for (i = 0; i < buf->num_pages; i++) {
-        phys_addr_t addr;
-
-        addr = xen_page_to_vaddr(buf->pages[i]);
-        gnttab_set_unmap_op(&unmap_ops[i], addr, GNTMAP_host_map,
-                    buf->backend_map_handles[i]);
-    }
-
-    ret = gnttab_unmap_refs(unmap_ops, NULL, buf->pages,
-                buf->num_pages);
-
-    for (i = 0; i < buf->num_pages; i++) {
-        if (unlikely(unmap_ops[i].status != GNTST_okay))
-            DRM_ERROR("Failed to unmap page %d: %d\n",
-                  i, unmap_ops[i].status);
-    }
-
-    if (ret)
-        DRM_ERROR("Failed to unmap grant references, ret %d", ret);
-
-    kfree(unmap_ops);
-    kfree(buf->backend_map_handles);
-    buf->backend_map_handles = NULL;
-    return ret;
-}
-
-static int backend_map(struct xen_drm_front_shbuf *buf)
-{
-    struct gnttab_map_grant_ref *map_ops = NULL;
-    unsigned char *ptr;
-    int ret, cur_gref, cur_dir_page, cur_page, grefs_left;
-
-    map_ops = kcalloc(buf->num_pages, sizeof(*map_ops), GFP_KERNEL);
-    if (!map_ops)
-        return -ENOMEM;
-
-    buf->backend_map_handles = kcalloc(buf->num_pages,
-                       sizeof(*buf->backend_map_handles),
-                       GFP_KERNEL);
-    if (!buf->backend_map_handles) {
-        kfree(map_ops);
-        return -ENOMEM;
-    }
-
-    /*
-     * read page directory to get grefs from the backend: for external
-     * buffer we only allocate buf->grefs for the page directory,
-     * so buf->num_grefs has number of pages in the page directory itself
-     */
-    ptr = buf->directory;
-    grefs_left = buf->num_pages;
-    cur_page = 0;
-    for (cur_dir_page = 0; cur_dir_page < buf->num_grefs; cur_dir_page++) {
-        struct xendispl_page_directory *page_dir =
-                (struct xendispl_page_directory *)ptr;
-        int to_copy = XEN_DRM_NUM_GREFS_PER_PAGE;
-
-        if (to_copy > grefs_left)
-            to_copy = grefs_left;
-
-        for (cur_gref = 0; cur_gref < to_copy; cur_gref++) {
-            phys_addr_t addr;
-
-            addr = xen_page_to_vaddr(buf->pages[cur_page]);
-            gnttab_set_map_op(&map_ops[cur_page], addr,
-                      GNTMAP_host_map,
-                      page_dir->gref[cur_gref],
-                      buf->xb_dev->otherend_id);
-            cur_page++;
-        }
-
-        grefs_left -= to_copy;
-        ptr += PAGE_SIZE;
-    }
-    ret = gnttab_map_refs(map_ops, NULL, buf->pages, buf->num_pages);
-
-    /* save handles even if error, so we can unmap */
-    for (cur_page = 0; cur_page < buf->num_pages; cur_page++) {
-        buf->backend_map_handles[cur_page] = map_ops[cur_page].handle;
-        if (unlikely(map_ops[cur_page].status != GNTST_okay))
-            DRM_ERROR("Failed to map page %d: %d\n",
-                  cur_page, map_ops[cur_page].status);
-    }
-
-    if (ret) {
-        DRM_ERROR("Failed to map grant references, ret %d", ret);
-        backend_unmap(buf);
-    }
-
-    kfree(map_ops);
-    return ret;
-}
-
-static void backend_fill_page_dir(struct xen_drm_front_shbuf *buf)
-{
-    struct xendispl_page_directory *page_dir;
-    unsigned char *ptr;
-    int i, num_pages_dir;
-
-    ptr = buf->directory;
-    num_pages_dir = get_num_pages_dir(buf);
-
-    /* fill only grefs for the page directory itself */
-    for (i = 0; i < num_pages_dir - 1; i++) {
-        page_dir = (struct xendispl_page_directory *)ptr;
-
-        page_dir->gref_dir_next_page = buf->grefs[i + 1];
-        ptr += PAGE_SIZE;
-    }
-    /* last page must say there is no more pages */
-    page_dir = (struct xendispl_page_directory *)ptr;
-    page_dir->gref_dir_next_page = GRANT_INVALID_REF;
-}
-
-static void guest_fill_page_dir(struct xen_drm_front_shbuf *buf)
-{
-    unsigned char *ptr;
-    int cur_gref, grefs_left, to_copy, i, num_pages_dir;
-
-    ptr = buf->directory;
-    num_pages_dir = get_num_pages_dir(buf);
-
-    /*
-     * while copying, skip grefs at start, they are for pages
-     * granted for the page directory itself
-     */
-    cur_gref = num_pages_dir;
-    grefs_left = buf->num_pages;
-    for (i = 0; i < num_pages_dir; i++) {
-        struct xendispl_page_directory *page_dir =
-                (struct xendispl_page_directory *)ptr;
-
-        if (grefs_left <= XEN_DRM_NUM_GREFS_PER_PAGE) {
-            to_copy = grefs_left;
-            page_dir->gref_dir_next_page = GRANT_INVALID_REF;
-        } else {
-            to_copy = XEN_DRM_NUM_GREFS_PER_PAGE;
-            page_dir->gref_dir_next_page = buf->grefs[i + 1];
-        }
-        memcpy(&page_dir->gref, &buf->grefs[cur_gref],
-               to_copy * sizeof(grant_ref_t));
-        ptr += PAGE_SIZE;
-        grefs_left -= to_copy;
-        cur_gref += to_copy;
-    }
-}
-
-static int guest_grant_refs_for_buffer(struct xen_drm_front_shbuf *buf,
-                       grant_ref_t *priv_gref_head,
-                       int gref_idx)
-{
-    int i, cur_ref, otherend_id;
-
-    otherend_id = buf->xb_dev->otherend_id;
-    for (i = 0; i < buf->num_pages; i++) {
-        cur_ref = gnttab_claim_grant_reference(priv_gref_head);
-        if (cur_ref < 0)
-            return cur_ref;
-
-        gnttab_grant_foreign_access_ref(cur_ref, otherend_id,
-                        xen_page_to_gfn(buf->pages[i]),
-                        0);
-        buf->grefs[gref_idx++] = cur_ref;
-    }
-    return 0;
-}
-
-static int grant_references(struct xen_drm_front_shbuf *buf)
-{
-    grant_ref_t priv_gref_head;
-    int ret, i, j, cur_ref;
-    int otherend_id, num_pages_dir;
-
-    ret = gnttab_alloc_grant_references(buf->num_grefs, &priv_gref_head);
-    if (ret < 0) {
-        DRM_ERROR("Cannot allocate grant references\n");
-        return ret;
-    }
-
-    otherend_id = buf->xb_dev->otherend_id;
-    j = 0;
-    num_pages_dir = get_num_pages_dir(buf);
-    for (i = 0; i < num_pages_dir; i++) {
-        unsigned long frame;
-
-        cur_ref = gnttab_claim_grant_reference(&priv_gref_head);
-        if (cur_ref < 0)
-            return cur_ref;
-
-        frame = xen_page_to_gfn(virt_to_page(buf->directory +
-                    PAGE_SIZE * i));
-        gnttab_grant_foreign_access_ref(cur_ref, otherend_id, frame, 0);
-        buf->grefs[j++] = cur_ref;
-    }
-
-    if (buf->ops->grant_refs_for_buffer) {
-        ret = buf->ops->grant_refs_for_buffer(buf, &priv_gref_head, j);
-        if (ret)
-            return ret;
-    }
-
-    gnttab_free_grant_references(priv_gref_head);
-    return 0;
-}
-
-static int alloc_storage(struct xen_drm_front_shbuf *buf)
-{
-    buf->grefs = kcalloc(buf->num_grefs, sizeof(*buf->grefs), GFP_KERNEL);
-    if (!buf->grefs)
-        return -ENOMEM;
-
-    buf->directory = kcalloc(get_num_pages_dir(buf), PAGE_SIZE, GFP_KERNEL);
-    if (!buf->directory)
-        return -ENOMEM;
-
-    return 0;
-}
-
-/*
- * For be allocated buffers we don't need grant_refs_for_buffer as those
- * grant references are allocated at backend side
- */
-static const struct xen_drm_front_shbuf_ops backend_ops = {
-    .calc_num_grefs = backend_calc_num_grefs,
-    .fill_page_dir = backend_fill_page_dir,
-    .map = backend_map,
-    .unmap = backend_unmap
-};
-
-/* For locally granted references we do not need to map/unmap the references */
-static const struct xen_drm_front_shbuf_ops local_ops = {
-    .calc_num_grefs = guest_calc_num_grefs,
-    .fill_page_dir = guest_fill_page_dir,
-    .grant_refs_for_buffer = guest_grant_refs_for_buffer,
-};
-
-struct xen_drm_front_shbuf *
-xen_drm_front_shbuf_alloc(struct xen_drm_front_shbuf_cfg *cfg)
-{
-    struct xen_drm_front_shbuf *buf;
-    int ret;
-
-    buf = kzalloc(sizeof(*buf), GFP_KERNEL);
-    if (!buf)
-        return ERR_PTR(-ENOMEM);
-
-    if (cfg->be_alloc)
-        buf->ops = &backend_ops;
-    else
-        buf->ops = &local_ops;
-
-    buf->xb_dev = cfg->xb_dev;
-    buf->num_pages = DIV_ROUND_UP(cfg->size, PAGE_SIZE);
-    buf->pages = cfg->pages;
-
-    buf->ops->calc_num_grefs(buf);
-
-    ret = alloc_storage(buf);
-    if (ret)
-        goto fail;
-
-    ret = grant_references(buf);
-    if (ret)
-        goto fail;
-
-    buf->ops->fill_page_dir(buf);
-
-    return buf;
-
-fail:
-    xen_drm_front_shbuf_free(buf);
-    return ERR_PTR(ret);
-}
diff --git a/drivers/gpu/drm/xen/xen_drm_front_shbuf.h b/drivers/gpu/drm/xen/xen_drm_front_shbuf.h
deleted file mode 100644
index 7545c692539e..000000000000
--- a/drivers/gpu/drm/xen/xen_drm_front_shbuf.h
+++ /dev/null
@@ -1,64 +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>
- */
-
-#ifndef __XEN_DRM_FRONT_SHBUF_H_
-#define __XEN_DRM_FRONT_SHBUF_H_
-
-#include <linux/kernel.h>
-#include <linux/scatterlist.h>
-
-#include <xen/grant_table.h>
-
-struct xen_drm_front_shbuf {
-    /*
-     * number of references granted for the backend use:
-     *  - for allocated/imported dma-buf's this holds number of grant
-     *    references for the page directory and pages of the buffer
-     *  - for the buffer provided by the backend this holds number of
-     *    grant references for the page directory as grant references for
-     *    the buffer will be provided by the backend
-     */
-    int num_grefs;
-    grant_ref_t *grefs;
-    unsigned char *directory;
-
-    int num_pages;
-    struct page **pages;
-
-    struct xenbus_device *xb_dev;
-
-    /* these are the ops used internally depending on be_alloc mode */
-    const struct xen_drm_front_shbuf_ops *ops;
-
-    /* Xen map handles for the buffer allocated by the backend */
-    grant_handle_t *backend_map_handles;
-};
-
-struct xen_drm_front_shbuf_cfg {
-    struct xenbus_device *xb_dev;
-    size_t size;
-    struct page **pages;
-    bool be_alloc;
-};
-
-struct xen_drm_front_shbuf *
-xen_drm_front_shbuf_alloc(struct xen_drm_front_shbuf_cfg *cfg);
-
-grant_ref_t xen_drm_front_shbuf_get_dir_start(struct xen_drm_front_shbuf *buf);
-
-int xen_drm_front_shbuf_map(struct xen_drm_front_shbuf *buf);
-
-int xen_drm_front_shbuf_unmap(struct xen_drm_front_shbuf *buf);
-
-void xen_drm_front_shbuf_flush(struct xen_drm_front_shbuf *buf);
-
-void xen_drm_front_shbuf_free(struct xen_drm_front_shbuf *buf);
-
-#endif /* __XEN_DRM_FRONT_SHBUF_H_ */

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