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Message-ID: <27491aa5-3548-4c39-13a2-132c738fae14@gmail.com>
Date: Thu, 13 Dec 2018 12:16:52 +0200
From: Oleksandr Andrushchenko <andr2000@...il.com>
To: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, alsa-devel@...a-project.org,
jgross@...e.com, boris.ostrovsky@...cle.com,
Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: 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@...m.com>
>>
>> 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@...m.com>
>> ---
>> 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@...m.com>
>> - */
>> -
>> -#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@...m.com>
>> - */
>> -
>> -#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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