From: Matthew Auld <matthew.auld@intel.com>
Date: Fri, 6 Oct 2017 23:18:14 +0100
Subject: drm/i915: introduce simple gemfs
Git-commit: 465c403cb50868a86164bfe5b3bf6ddd70c395e1
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Not a fully blown gemfs, just our very own tmpfs kernel mount. Doing so
moves us away from the shmemfs shm_mnt, and gives us the much needed
flexibility to do things like set our own mount options, namely huge=
which should allow us to enable the use of transparent-huge-pages for
our shmem backed objects.
v2: various improvements suggested by Joonas
v3: move gemfs instance to i915.mm and simplify now that we have
file_setup_with_mnt
v4: fallback to tmpfs shm_mnt upon failure to setup gemfs
v5: make tmpfs fallback kinder
v5: better gemfs failure message
flags variable
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Hugh Dickins <hughd@google.com>
Cc: linux-mm@kvack.org
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006145041.21673-3-matthew.auld@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171006221833.32439-2-chris@chris-wilson.co.uk
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/i915/Makefile | 1
drivers/gpu/drm/i915/i915_drv.h | 5 ++
drivers/gpu/drm/i915/i915_gem.c | 33 ++++++++++++++
drivers/gpu/drm/i915/i915_gemfs.c | 52 +++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gemfs.h | 34 +++++++++++++++
drivers/gpu/drm/i915/selftests/mock_gem_device.c | 4 +
6 files changed, 128 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -47,6 +47,7 @@ i915-y += i915_cmd_parser.o \
i915_gem_tiling.o \
i915_gem_timeline.o \
i915_gem_userptr.o \
+ i915_gemfs.o \
i915_trace_points.o \
i915_vma.o \
intel_breadcrumbs.o \
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1511,6 +1511,11 @@ struct i915_gem_mm {
/** Usable portion of the GTT for GEM */
dma_addr_t stolen_base; /* limited to low memory (32-bit) */
+ /**
+ * tmpfs instance used for shmem backed objects
+ */
+ struct vfsmount *gemfs;
+
/** PPGTT used for aliasing the PPGTT with the GTT */
struct i915_hw_ppgtt *aliasing_ppgtt;
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -35,6 +35,7 @@
#include "intel_drv.h"
#include "intel_frontbuffer.h"
#include "intel_mocs.h"
+#include "i915_gemfs.h"
#include <linux/dma-fence-array.h>
#include <linux/kthread.h>
#include <linux/reservation.h>
@@ -4261,6 +4262,30 @@ static const struct drm_i915_gem_object_
.pwrite = i915_gem_object_pwrite_gtt,
};
+static int i915_gem_object_create_shmem(struct drm_device *dev,
+ struct drm_gem_object *obj,
+ size_t size)
+{
+ struct drm_i915_private *i915 = to_i915(dev);
+ unsigned long flags = VM_NORESERVE;
+ struct file *filp;
+
+ drm_gem_private_object_init(dev, obj, size);
+
+ if (i915->mm.gemfs)
+ filp = shmem_file_setup_with_mnt(i915->mm.gemfs, "i915", size,
+ flags);
+ else
+ filp = shmem_file_setup("i915", size, flags);
+
+ if (IS_ERR(filp))
+ return PTR_ERR(filp);
+
+ obj->filp = filp;
+
+ return 0;
+}
+
struct drm_i915_gem_object *
i915_gem_object_create(struct drm_i915_private *dev_priv, u64 size)
{
@@ -4285,7 +4310,7 @@ i915_gem_object_create(struct drm_i915_p
if (obj == NULL)
return ERR_PTR(-ENOMEM);
- ret = drm_gem_object_init(&dev_priv->drm, &obj->base, size);
+ ret = i915_gem_object_create_shmem(&dev_priv->drm, &obj->base, size);
if (ret)
goto fail;
@@ -4924,6 +4949,10 @@ i915_gem_load_init(struct drm_i915_priva
spin_lock_init(&dev_priv->fb_tracking.lock);
+ err = i915_gemfs_init(dev_priv);
+ if (err)
+ DRM_NOTE("Unable to create a private tmpfs mount, hugepage support will be disabled(%d).\n", err);
+
return 0;
err_priorities:
@@ -4962,6 +4991,8 @@ void i915_gem_load_cleanup(struct drm_i9
/* And ensure that our DESTROY_BY_RCU slabs are truly destroyed */
rcu_barrier();
+
+ i915_gemfs_fini(dev_priv);
}
int i915_gem_freeze(struct drm_i915_private *dev_priv)
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gemfs.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+
+#include "i915_drv.h"
+#include "i915_gemfs.h"
+
+int i915_gemfs_init(struct drm_i915_private *i915)
+{
+ struct file_system_type *type;
+ struct vfsmount *gemfs;
+
+ type = get_fs_type("tmpfs");
+ if (!type)
+ return -ENODEV;
+
+ gemfs = kern_mount(type);
+ if (IS_ERR(gemfs))
+ return PTR_ERR(gemfs);
+
+ i915->mm.gemfs = gemfs;
+
+ return 0;
+}
+
+void i915_gemfs_fini(struct drm_i915_private *i915)
+{
+ kern_unmount(i915->mm.gemfs);
+}
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gemfs.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#ifndef __I915_GEMFS_H__
+#define __I915_GEMFS_H__
+
+struct drm_i915_private;
+
+int i915_gemfs_init(struct drm_i915_private *i915);
+
+void i915_gemfs_fini(struct drm_i915_private *i915);
+
+#endif
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -83,6 +83,8 @@ static void mock_device_release(struct d
kmem_cache_destroy(i915->vmas);
kmem_cache_destroy(i915->objects);
+ i915_gemfs_fini(i915);
+
drm_dev_fini(&i915->drm);
put_device(&i915->drm.pdev->dev);
}
@@ -243,6 +245,8 @@ struct drm_i915_private *mock_gem_device
if (!i915->preempt_context)
goto err_kernel_context;
+ WARN_ON(i915_gemfs_init(i915));
+
return i915;
err_kernel_context: