[Nouveau] [PATCH 09/10] nouveau: EVO debug iface

[Maxim Levitsky]

This code adds new debugfs file that allows to send evo commands from userspace.
Its usefull for RE.

Signed-off-by: Maxim Levitsky <maximlevitsky at gmail.com>
---
 drivers/gpu/drm/nouveau/nouveau_debugfs.c |  101 +++++++++++++++++++++++++++++
 drivers/gpu/drm/nouveau/nv50_crtc.c       |    2 +-
 drivers/gpu/drm/nouveau/nv50_display.h    |    1 +
 3 files changed, 103 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 8e15923..c79bf56 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -30,11 +30,16 @@
 
 #include <linux/debugfs.h>
 
+#define NOUVEAU_DMA_DEBUG 1
 #include "drmP.h"
 #include "nouveau_drv.h"
+#include "nouveau_dma.h"
+#include "nv50_display.h"
+#include "nouveau_crtc.h"
 
 #include <ttm/ttm_page_alloc.h>
 
+
 static int
 nouveau_debugfs_channel_info(struct seq_file *m, void *data)
 {
@@ -181,11 +186,107 @@ static struct drm_info_list nouveau_debugfs_list[] = {
 };
 #define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)
 
+static int nouveau_evo_debugfs_open(struct inode *inode, struct file *file)
+{
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static int nouveau_evo_debugfs_release (struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+int
+nv50_crtc_wait_complete(struct drm_crtc *crtc);
+
+
+static ssize_t nouveau_evo_debugfs_write(struct file *file, const char __user * user_buf,
+			size_t count, loff_t *ppos)
+{
+	struct drm_minor *minor = (struct drm_minor *)file->private_data;
+	struct drm_device* dev = minor->dev;
+	struct nouveau_channel *evo;
+	struct drm_crtc *crtc;
+	struct nv50_display *display;
+	u32 method, value;
+	unsigned char *cmd;
+	int ret;
+
+	if (count > 100 || *ppos)
+		return -EINVAL;
+
+	cmd = kmalloc(count + 1, GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	if (copy_from_user(cmd, user_buf, count)) {
+		kfree(cmd);
+		return -EINVAL;
+	}
+
+	cmd[count] = '\0';
+
+	mutex_lock(&dev->mode_config.mutex);
+
+	display = nv50_display(dev);
+	evo = display->master;
+
+	if (sscanf(cmd, "%x %x", &method, &value) == 2) {
+
+		ret = RING_SPACE(evo, 2);
+		if (ret)
+			goto out;
+
+		BEGIN_RING(evo, 0, method, 1);
+		OUT_RING(evo, value);
+		FIRE_RING(evo);
+
+	} else if (!strncmp(cmd, "flush", 5)) {
+
+		ret = RING_SPACE(evo, 6);
+		if (ret)
+			goto out;
+
+		BEGIN_RING(evo, 0, 0x84, 1);
+		OUT_RING(evo, 0x80000004);
+		BEGIN_RING(evo, 0, 0x84, 1);
+		OUT_RING(evo, 0x80000008);
+		BEGIN_RING(evo, 0, 0x80, 1);
+		OUT_RING(evo, 0x00000000);
+		FIRE_RING(evo);
+
+		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+			if (crtc->fb) {
+				nv50_display_flip_stop(crtc);
+				nv50_crtc_wait_complete(crtc);
+				nv50_display_flip_next(crtc, crtc->fb, NULL);
+			}
+		}
+	} else
+		NV_ERROR(dev, "evodbg: malformated input %s\n", cmd);
+
+	ret =  count;
+out:
+	kfree(cmd);
+	mutex_unlock(&dev->mode_config.mutex);
+	return ret;
+}
+
+static const struct file_operations evo_debugfs_ops = {
+	.open = nouveau_evo_debugfs_open,
+	.release = nouveau_evo_debugfs_release,
+	.write = nouveau_evo_debugfs_write,
+	.llseek = default_llseek,
+};
+
 int
 nouveau_debugfs_init(struct drm_minor *minor)
 {
 	drm_debugfs_create_files(nouveau_debugfs_list, NOUVEAU_DEBUGFS_ENTRIES,
 				 minor->debugfs_root, minor);
+	debugfs_create_file("evo",
+		S_IWUSR, minor->debugfs_root, minor, &evo_debugfs_ops);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nv50_crtc.c b/drivers/gpu/drm/nouveau/nv50_crtc.c
index cb8943f..4b2d9ec 100644
--- a/drivers/gpu/drm/nouveau/nv50_crtc.c
+++ b/drivers/gpu/drm/nouveau/nv50_crtc.c
@@ -443,7 +443,7 @@ nv50_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 }
 
-static int
+int
 nv50_crtc_wait_complete(struct drm_crtc *crtc)
 {
 	struct drm_device *dev = crtc->dev;
diff --git a/drivers/gpu/drm/nouveau/nv50_display.h b/drivers/gpu/drm/nouveau/nv50_display.h
index c2da503..44c0157 100644
--- a/drivers/gpu/drm/nouveau/nv50_display.h
+++ b/drivers/gpu/drm/nouveau/nv50_display.h
@@ -72,6 +72,7 @@ int nv50_display_init(struct drm_device *dev);
 void nv50_display_destroy(struct drm_device *dev);
 int nv50_crtc_blank(struct nouveau_crtc *, bool blank);
 int nv50_crtc_set_clock(struct drm_device *, int head, int pclk);
+int nv50_crtc_wait_complete(struct drm_crtc *crtc);
 
 int  nv50_display_flip_next(struct drm_crtc *, struct drm_framebuffer *,
 			    struct nouveau_channel *chan);
-- 
1.7.4.1