[Intel-xe] [PATCH v3 3/5] drm/xe/pm: Add vram_d3cold_threshold Sysfs
Anshuman Gupta
anshuman.gupta at intel.com
Tue Jun 27 11:56:40 UTC 2023
Add per pci device vram_d3cold_threshold Sysfs to
control the d3cold allowed knob.
Adding a d3cold structure embedded in xe_device to encapsulate
d3cold related stuff.
v2:
- Check total vram before initializing default threshold. [Riana]
- Add static scope to vram_d3cold_threshold DEVICE_ATTR. [Riana]
v3:
- Fixed cosmetics review comment. [Riana]
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
---
drivers/gpu/drm/xe/Makefile | 1 +
drivers/gpu/drm/xe/xe_device_sysfs.c | 85 ++++++++++++++++++++++++++++
drivers/gpu/drm/xe/xe_device_sysfs.h | 13 +++++
drivers/gpu/drm/xe/xe_device_types.h | 21 +++++--
drivers/gpu/drm/xe/xe_pci.c | 10 ++--
drivers/gpu/drm/xe/xe_pm.c | 37 ++++++++++--
drivers/gpu/drm/xe/xe_pm.h | 3 +
7 files changed, 157 insertions(+), 13 deletions(-)
create mode 100644 drivers/gpu/drm/xe/xe_device_sysfs.c
create mode 100644 drivers/gpu/drm/xe/xe_device_sysfs.h
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 4b82cb2773ad..f84b7b4d4324 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -49,6 +49,7 @@ xe-y += xe_bb.o \
xe_debugfs.o \
xe_devcoredump.o \
xe_device.o \
+ xe_device_sysfs.o \
xe_dma_buf.o \
xe_engine.o \
xe_exec.o \
diff --git a/drivers/gpu/drm/xe/xe_device_sysfs.c b/drivers/gpu/drm/xe/xe_device_sysfs.c
new file mode 100644
index 000000000000..15ace0041798
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_device_sysfs.c
@@ -0,0 +1,85 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include <linux/kobject.h>
+#include <linux/pci.h>
+#include <linux/sysfs.h>
+
+#include <drm/drm_managed.h>
+
+#include "xe_device.h"
+#include "xe_pm.h"
+
+/**
+ * DOC: Xe device sysfs
+ * vram_d3cold_threshold - Report/change vram used threshold below which
+ * vram save/restore permissible (in MB), Xe save/restore during runtime
+ * D3cold entry/exit. vram_d3cold_threshold sysfs attribute will available
+ * under device kobject directory.
+ */
+
+static ssize_t
+vram_d3cold_threshold_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct xe_device *xe = pdev_to_xe_device(pdev);
+ int ret;
+
+ if (!xe)
+ return -EINVAL;
+
+ ret = sysfs_emit(buf, "%d\n", xe->d3cold.vram_threshold);
+
+ return ret;
+}
+
+static ssize_t
+vram_d3cold_threshold_store(struct device *dev, struct device_attribute *attr,
+ const char *buff, size_t count)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct xe_device *xe = pdev_to_xe_device(pdev);
+ u32 vram_d3cold_threshold;
+ int ret;
+
+ if (!xe)
+ return -EINVAL;
+
+ ret = kstrtou32(buff, 0, &vram_d3cold_threshold);
+ if (ret)
+ return ret;
+
+ drm_dbg(&xe->drm, "vram_d3cold_threshold: %u\n", vram_d3cold_threshold);
+
+ ret = xe_pm_set_vram_threshold(xe, vram_d3cold_threshold);
+
+ return ret ?: count;
+}
+
+static DEVICE_ATTR_RW(vram_d3cold_threshold);
+
+static void xe_device_sysfs_fini(struct drm_device *drm, void *arg)
+{
+ struct xe_device *xe = arg;
+
+ sysfs_remove_file(&xe->drm.dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
+}
+
+void xe_device_sysfs_init(struct xe_device *xe)
+{
+ struct device *dev = xe->drm.dev;
+ int ret;
+
+ ret = sysfs_create_file(&dev->kobj, &dev_attr_vram_d3cold_threshold.attr);
+ if (ret) {
+ drm_warn(&xe->drm, "Failed to create sysfs file\n");
+ return;
+ }
+
+ ret = drmm_add_action_or_reset(&xe->drm, xe_device_sysfs_fini, xe);
+ if (ret)
+ drm_warn(&xe->drm, "Failed to add sysfs fini drm action\n");
+}
diff --git a/drivers/gpu/drm/xe/xe_device_sysfs.h b/drivers/gpu/drm/xe/xe_device_sysfs.h
new file mode 100644
index 000000000000..f9e83d8bd2c7
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_device_sysfs.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#ifndef _XE_DEVICE_SYSFS_H_
+#define _XE_DEVICE_SYSFS_H_
+
+struct xe_device;
+
+int xe_device_sysfs_init(struct xe_device *xe);
+
+#endif
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 7a12d8c657c4..c047571c8ab0 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -329,11 +329,24 @@ struct xe_device {
bool hold_rpm;
} mem_access;
- /** d3cold_capable: Indicates if root port is d3cold capable */
- bool d3cold_capable;
+ struct {
+ /** capable: Indicates if root port is d3cold capable */
+ bool capable;
+
+ /** @allowed: Indicates if d3cold is a valid device state */
+ bool allowed;
- /** @d3cold_allowed: Indicates if d3cold is a valid device state */
- bool d3cold_allowed;
+ /**
+ * @vram_threshold is the permissible threshold(in megabytes)
+ * for vram save/restore. d3cold will be disallowed,
+ * when vram_usages is above threshold value to avoid the
+ * vram save/restore latency.
+ * Default threshold value is 300mb.
+ */
+ u32 vram_threshold;
+ /** Lock to protect vram_threshold */
+ struct mutex lock;
+ } d3cold;
/* private: */
diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 1b526d1e4d75..848de5dcdaa5 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -758,7 +758,7 @@ static int xe_pci_runtime_suspend(struct device *dev)
pci_save_state(pdev);
- if (xe->d3cold_allowed) {
+ if (xe->d3cold.allowed) {
pci_disable_device(pdev);
pci_ignore_hotplug(pdev);
pci_set_power_state(pdev, PCI_D3cold);
@@ -781,7 +781,7 @@ static int xe_pci_runtime_resume(struct device *dev)
pci_restore_state(pdev);
- if (xe->d3cold_allowed) {
+ if (xe->d3cold.allowed) {
err = pci_enable_device(pdev);
if (err)
return err;
@@ -797,8 +797,8 @@ static int xe_pci_runtime_idle(struct device *dev)
struct pci_dev *pdev = to_pci_dev(dev);
struct xe_device *xe = pdev_to_xe_device(pdev);
- if (!xe->d3cold_capable) {
- xe->d3cold_allowed = false;
+ if (!xe->d3cold.capable) {
+ xe->d3cold.allowed = false;
} else {
/*
* TODO: d3cold should be allowed (true) if
@@ -811,7 +811,7 @@ static int xe_pci_runtime_idle(struct device *dev)
* 3. at resume, detect if we really lost power and avoid memory
* restoration if we were only up to d3cold
*/
- xe->d3cold_allowed = false;
+ xe->d3cold.allowed = false;
}
return 0;
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index c250a36b99ad..7028c9b6e94c 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -12,6 +12,7 @@
#include "xe_bo.h"
#include "xe_bo_evict.h"
#include "xe_device.h"
+#include "xe_device_sysfs.h"
#include "xe_display.h"
#include "xe_ggtt.h"
#include "xe_gt.h"
@@ -148,8 +149,11 @@ void xe_pm_init(struct xe_device *xe)
{
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+ mutex_init(&xe->d3cold.lock);
xe_pm_runtime_init(xe);
- xe->d3cold_capable = xe_pm_pci_d3cold_capable(pdev);
+ xe->d3cold.capable = xe_pm_pci_d3cold_capable(pdev);
+ xe_device_sysfs_init(xe);
+ xe_pm_set_vram_threshold(xe, DEFAULT_VRAM_THRESHOLD);
}
void xe_pm_runtime_fini(struct xe_device *xe)
@@ -166,7 +170,7 @@ int xe_pm_runtime_suspend(struct xe_device *xe)
u8 id;
int err;
- if (xe->d3cold_allowed) {
+ if (xe->d3cold.allowed) {
if (xe_device_mem_access_ongoing(xe))
return -EBUSY;
@@ -192,7 +196,7 @@ int xe_pm_runtime_resume(struct xe_device *xe)
u8 id;
int err;
- if (xe->d3cold_allowed) {
+ if (xe->d3cold.allowed) {
for_each_gt(gt, xe, id) {
err = xe_pcode_init(gt);
if (err)
@@ -213,7 +217,7 @@ int xe_pm_runtime_resume(struct xe_device *xe)
for_each_gt(gt, xe, id)
xe_gt_resume(gt);
- if (xe->d3cold_allowed) {
+ if (xe->d3cold.allowed) {
err = xe_bo_restore_user(xe);
if (err)
return err;
@@ -248,3 +252,28 @@ int xe_pm_runtime_get_if_active(struct xe_device *xe)
WARN_ON(pm_runtime_suspended(xe->drm.dev));
return pm_runtime_get_if_active(xe->drm.dev, true);
}
+
+int xe_pm_set_vram_threshold(struct xe_device *xe, u32 threshold)
+{
+ struct ttm_resource_manager *man;
+ u32 vram_total_mb = 0;
+ int i;
+
+ /* TODO: Extend the logic to beyond XE_PL_VRAM1 */
+ for (i = XE_PL_VRAM0; i <= XE_PL_VRAM1; ++i) {
+ man = ttm_manager_type(&xe->ttm, i);
+ if (man)
+ vram_total_mb += DIV_ROUND_UP_ULL(man->size, 1024 * 1024);
+ }
+
+ drm_dbg(&xe->drm, "Total vram %u mb\n", vram_total_mb);
+
+ if (threshold > vram_total_mb)
+ return -EINVAL;
+
+ mutex_lock(&xe->d3cold.lock);
+ xe->d3cold.vram_threshold = threshold;
+ mutex_unlock(&xe->d3cold.lock);
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/xe/xe_pm.h b/drivers/gpu/drm/xe/xe_pm.h
index e0c4f92e27c5..b50ec8bdce6f 100644
--- a/drivers/gpu/drm/xe/xe_pm.h
+++ b/drivers/gpu/drm/xe/xe_pm.h
@@ -8,6 +8,8 @@
#include <linux/pm_runtime.h>
+#define DEFAULT_VRAM_THRESHOLD 300
+
struct xe_device;
int xe_pm_suspend(struct xe_device *xe);
@@ -21,5 +23,6 @@ int xe_pm_runtime_get(struct xe_device *xe);
int xe_pm_runtime_put(struct xe_device *xe);
bool xe_pm_runtime_resume_if_suspended(struct xe_device *xe);
int xe_pm_runtime_get_if_active(struct xe_device *xe);
+int xe_pm_set_vram_threshold(struct xe_device *xe, u32 threshold);
#endif
--
2.38.0
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