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These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
133 lines
3.6 KiB
Diff
133 lines
3.6 KiB
Diff
From ffc4d519dd892375d66d0214445c74fc1d3a001b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ma=C3=ADra=20Canal?= <mcanal@igalia.com>
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Date: Mon, 23 Sep 2024 10:55:09 -0300
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Subject: [PATCH] drm/v3d: Introduce gemfs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Commit eb8d395f68421449c6201d3019f51011d034f00e upstream
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Create a separate "tmpfs" kernel mount for V3D. This will allow us to
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move away from the shmemfs `shm_mnt` and gives the flexibility to do
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things like set our own mount options. Here, the interest is to use
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"huge=", which should allow us to enable the use of THP for our
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shmem-backed objects.
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Signed-off-by: Maíra Canal <mcanal@igalia.com>
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Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/20240923141348.2422499-6-mcanal@igalia.com
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---
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drivers/gpu/drm/v3d/Makefile | 3 ++-
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drivers/gpu/drm/v3d/v3d_drv.h | 9 +++++++
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drivers/gpu/drm/v3d/v3d_gem.c | 3 +++
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drivers/gpu/drm/v3d/v3d_gemfs.c | 46 +++++++++++++++++++++++++++++++++
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4 files changed, 60 insertions(+), 1 deletion(-)
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create mode 100644 drivers/gpu/drm/v3d/v3d_gemfs.c
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--- a/drivers/gpu/drm/v3d/Makefile
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+++ b/drivers/gpu/drm/v3d/Makefile
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@@ -13,7 +13,8 @@ v3d-y := \
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v3d_trace_points.o \
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v3d_sched.o \
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v3d_sysfs.o \
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- v3d_submit.o
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+ v3d_submit.o \
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+ v3d_gemfs.o
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v3d-$(CONFIG_DEBUG_FS) += v3d_debugfs.o
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--- a/drivers/gpu/drm/v3d/v3d_drv.h
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+++ b/drivers/gpu/drm/v3d/v3d_drv.h
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@@ -143,6 +143,11 @@ struct v3d_dev {
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struct drm_mm mm;
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spinlock_t mm_lock;
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+ /*
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+ * tmpfs instance used for shmem backed objects
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+ */
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+ struct vfsmount *gemfs;
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+
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struct work_struct overflow_mem_work;
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struct v3d_bin_job *bin_job;
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@@ -540,6 +545,10 @@ void v3d_reset(struct v3d_dev *v3d);
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void v3d_invalidate_caches(struct v3d_dev *v3d);
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void v3d_clean_caches(struct v3d_dev *v3d);
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+/* v3d_gemfs.c */
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+void v3d_gemfs_init(struct v3d_dev *v3d);
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+void v3d_gemfs_fini(struct v3d_dev *v3d);
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+
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/* v3d_submit.c */
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void v3d_job_cleanup(struct v3d_job *job);
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void v3d_job_put(struct v3d_job *job);
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--- a/drivers/gpu/drm/v3d/v3d_gem.c
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+++ b/drivers/gpu/drm/v3d/v3d_gem.c
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@@ -291,6 +291,8 @@ v3d_gem_init(struct drm_device *dev)
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v3d_init_hw_state(v3d);
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v3d_mmu_set_page_table(v3d);
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+ v3d_gemfs_init(v3d);
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+
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ret = v3d_sched_init(v3d);
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if (ret) {
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drm_mm_takedown(&v3d->mm);
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@@ -308,6 +310,7 @@ v3d_gem_destroy(struct drm_device *dev)
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struct v3d_dev *v3d = to_v3d_dev(dev);
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v3d_sched_fini(v3d);
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+ v3d_gemfs_fini(v3d);
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/* Waiting for jobs to finish would need to be done before
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* unregistering V3D.
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--- /dev/null
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+++ b/drivers/gpu/drm/v3d/v3d_gemfs.c
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@@ -0,0 +1,46 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/* Copyright (C) 2024 Raspberry Pi */
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+
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+#include <linux/fs.h>
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+#include <linux/mount.h>
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+
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+#include "v3d_drv.h"
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+
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+void v3d_gemfs_init(struct v3d_dev *v3d)
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+{
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+ char huge_opt[] = "huge=within_size";
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+ struct file_system_type *type;
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+ struct vfsmount *gemfs;
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+
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+ /*
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+ * By creating our own shmemfs mountpoint, we can pass in
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+ * mount flags that better match our usecase. However, we
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+ * only do so on platforms which benefit from it.
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+ */
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+ if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE))
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+ goto err;
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+
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+ type = get_fs_type("tmpfs");
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+ if (!type)
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+ goto err;
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+
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+ gemfs = vfs_kern_mount(type, SB_KERNMOUNT, type->name, huge_opt);
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+ if (IS_ERR(gemfs))
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+ goto err;
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+
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+ v3d->gemfs = gemfs;
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+ drm_info(&v3d->drm, "Using Transparent Hugepages\n");
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+
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+ return;
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+
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+err:
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+ v3d->gemfs = NULL;
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+ drm_notice(&v3d->drm,
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+ "Transparent Hugepage support is recommended for optimal performance on this platform!\n");
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+}
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+
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+void v3d_gemfs_fini(struct v3d_dev *v3d)
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+{
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+ if (v3d->gemfs)
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+ kern_unmount(v3d->gemfs);
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+}
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