[PATCH] drm/xe/debugfs: Display gpuva info in debugfs

[Oak Zeng]

Add debugfs entry to display all the gpuva that is bound to the
device. This is done by walking all the VMs created for each device
process, and display va information of each VM. This is useful for
gpuvm debugging. With this change, user can display gpuva info
as below:

root at DUT7279PVC:/home/gta# cat /sys/kernel/debug/dri/0/gpuvas
Process "your process name" GPU VA space
DRM GPU VA space (Xe VM) [0x0000000000000000;0x0200000000000000]
Kernel reserved node [0x0000000000000000;0x0000000000000000]

 VAs | start              | range              | end                | object             | object offset
-------------------------------------------------------------------------------------------------------------
     | 0x0000000000000000 | 0x00007ffff5db7000 | 0x00007ffff5db7000 | 0x0000000000000000 | 0x0000000000000000
     | 0x00007ffff5db7000 | 0x0000000000001000 | 0x00007ffff5db8000 | 0x0000000000000000 | 0x00007ffff5db7000
     | 0x00007ffff5db8000 | 0x00ff80000a248000 | 0x0100000000000000 | 0x0000000000000000 | 0x0000000000000000

Signed-off-by: Oak Zeng <oak.zeng at intel.com>
---
 drivers/gpu/drm/xe/xe_debugfs.c | 44 +++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_debugfs.c b/drivers/gpu/drm/xe/xe_debugfs.c
index 1011e5d281fa..0c7bee1c2a8d 100644
--- a/drivers/gpu/drm/xe/xe_debugfs.c
+++ b/drivers/gpu/drm/xe/xe_debugfs.c
@@ -9,6 +9,7 @@
 #include <linux/string_helpers.h>
 
 #include <drm/drm_debugfs.h>
+#include <drm/drm_drv.h>
 
 #include "xe_bo.h"
 #include "xe_device.h"
@@ -84,9 +85,52 @@ static int sriov_info(struct seq_file *m, void *data)
 	return 0;
 }
 
+static int show_vm_gpuvas(struct xe_vm *vm, struct seq_file *m)
+{
+	int ret;
+
+	mutex_lock(&vm->snap_mutex);
+	ret = drm_debugfs_gpuva_info(m, &vm->gpuvm);
+	mutex_unlock(&vm->snap_mutex);
+
+	return ret;
+}
+
+static int show_each_vm(struct seq_file *m, void *arg)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct xe_device *xe = node_to_xe(node);
+	struct drm_device *dev = &xe->drm;
+	struct drm_file *file;
+	struct xe_file *xef;
+	int (*show)(struct xe_vm *, struct seq_file *) = node->info_ent->data;
+	struct xe_vm *vm;
+	unsigned long idx;
+	int ret = 0;
+
+	mutex_lock(&dev->filelist_mutex);
+	list_for_each_entry(file, &dev->filelist, lhead) {
+		xef = (struct xe_file *)file->driver_priv;
+		seq_printf(m, "Process %s GPU VA space\n", xef->process_name);
+		mutex_lock(&xef->vm.lock);
+		xa_for_each(&xef->vm.xa, idx, vm) {
+			ret = show(vm, m);
+			if (ret < 0)
+				break;
+
+			seq_puts(m, "\n");
+		}
+		mutex_unlock(&xef->vm.lock);
+	}
+	mutex_unlock(&dev->filelist_mutex);
+
+	return ret;
+}
+
 static const struct drm_info_list debugfs_list[] = {
 	{"info", info, 0},
 	{ .name = "sriov_info", .show = sriov_info, },
+	DRM_DEBUGFS_GPUVA_INFO(show_each_vm, show_vm_gpuvas),
 };
 
 static int forcewake_open(struct inode *inode, struct file *file)
-- 
2.26.3