@@ -1,5 +1,6 @@
/* SPDX-License-Identifier: MIT
* Copyright 2019 Advanced Micro Devices, Inc.
+ * Copyright © 2021 Intel Corporation
*/
#ifndef __DRM_CGROUP_H__
#define __DRM_CGROUP_H__
@@ -15,6 +16,10 @@ struct drm_device;
struct drmcg_props {
};
+enum drmcg_res_type {
+ __DRMCG_TYPE_LAST,
+};
+
#ifdef CONFIG_CGROUP_DRM
void drmcg_bind(struct drm_minor (*(*acq_dm)(unsigned int minor_id)),
@@ -5,6 +5,7 @@
*/
#include <linux/bitmap.h>
#include <linux/mutex.h>
+#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/cgroup.h>
#include <linux/cgroup_drm.h>
@@ -12,6 +13,7 @@
#include <drm/drm_drv.h>
#include <drm/drm_device.h>
#include <drm/drm_cgroup.h>
+#include <drm/drm_ioctl.h>
static struct drmcg *root_drmcg __read_mostly;
@@ -222,6 +224,106 @@ drmcg_css_alloc(struct cgroup_subsys_state *parent_css)
return &drmcg->css;
}
+static int drmcg_apply_value(struct drmcg_device_resource *ddr,
+ enum drmcg_res_type type, char *buf)
+{
+ int ret = 0;
+ unsigned long val;
+
+ switch (type) {
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int drmcg_seq_show_fn(int id, void *ptr, void *data)
+{
+ struct drm_minor *minor = ptr;
+ struct seq_file *sf = data;
+ struct drmcg *drmcg = css_to_drmcg(seq_css(sf));
+ enum drmcg_res_type type = seq_cft(sf)->private;
+ struct drmcg_device_resource *ddr;
+
+ if (minor->type != DRM_MINOR_PRIMARY)
+ return 0;
+
+ ddr = drmcg->dev_resources[minor->index];
+ if (ddr == NULL)
+ return 0;
+
+ seq_printf(sf, "%d:%d ", DRM_MAJOR, minor->index);
+ switch (type) {
+ default:
+ seq_puts(sf, "\n");
+ break;
+ }
+
+ return 0;
+}
+
+static int drmcg_seq_show(struct seq_file *sf, void *v)
+{
+ return drm_minor_for_each(&drmcg_seq_show_fn, sf);
+}
+
+static ssize_t drmcg_write(struct kernfs_open_file *of, char *buf,
+ size_t nbytes, loff_t off)
+{
+ struct drmcg *drmcg = css_to_drmcg(of_css(of));
+ enum drmcg_res_type type = of_cft(of)->private;
+ char *cft_name = of_cft(of)->name;
+ char *limits = strstrip(buf);
+ struct drmcg_device_resource *ddr;
+ struct drm_minor *dm;
+ char *line;
+ char sattr[256];
+ int minor, ret = 0;
+
+ while (!ret && limits != NULL) {
+ line = strsep(&limits, "\n");
+
+ if (sscanf(line,
+ __stringify(DRM_MAJOR)":%u %255[^\t\n]",
+ &minor, sattr) != 2) {
+ pr_err("drmcg: error parsing %s ", cft_name);
+ pr_cont_cgroup_name(drmcg->css.cgroup);
+ pr_cont("\n");
+
+ continue;
+ }
+
+ mutex_lock(&drmcg_mutex);
+ if (acquire_drm_minor)
+ dm = acquire_drm_minor(minor);
+ else
+ dm = NULL;
+ mutex_unlock(&drmcg_mutex);
+
+ if (IS_ERR_OR_NULL(dm)) {
+ pr_err("drmcg: invalid minor %d for %s ",
+ minor, cft_name);
+ pr_cont_cgroup_name(drmcg->css.cgroup);
+ pr_cont("\n");
+
+ continue;
+ }
+
+ mutex_lock(&dm->dev->drmcg_mutex);
+ ddr = drmcg->dev_resources[minor];
+ ret = drmcg_apply_value(ddr, type, sattr);
+ mutex_unlock(&dm->dev->drmcg_mutex);
+
+ mutex_lock(&drmcg_mutex);
+ if (put_drm_dev)
+ put_drm_dev(dm->dev); /* release from acquire_drm_minor */
+ mutex_unlock(&drmcg_mutex);
+ }
+
+ return ret ?: nbytes;
+}
+
struct cftype files[] = {
{ } /* terminate */
};
Add basic .seq_show and .write functions for use with DRM cgroup control files. This is based on original work from Kenny Ho and extracted from patches [1] and [2]. Has been simplified to remove having different file types and functions for each. [1] https://lists.freedesktop.org/archives/dri-devel/2020-February/254986.html [2] https://lists.freedesktop.org/archives/dri-devel/2020-February/254990.html Co-developed-by: Kenny Ho <Kenny.Ho@amd.com> Signed-off-by: Brian Welty <brian.welty@intel.com> --- include/drm/drm_cgroup.h | 5 ++ kernel/cgroup/drm.c | 102 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+)