From: Christian K?nig <christian.koe...@amd.com>
v2: add default_llseek
Signed-off-by: Christian K?nig <christian.koenig at amd.com>
---
drivers/gpu/drm/radeon/radeon.h | 1 +
drivers/gpu/drm/radeon/radeon_ttm.c | 55 +++++++++++++++++++++++++++++++++++++
2 files changed, 56 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 49f210c1..572476b 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -416,6 +416,7 @@ struct radeon_mman {
#if defined(CONFIG_DEBUG_FS)
struct dentry *vram;
+ struct dentry *gtt;
#endif
};
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c
b/drivers/gpu/drm/radeon/radeon_ttm.c
index f5300a3..7bc116a 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -915,6 +915,52 @@ static const struct file_operations radeon_ttm_vram_fops =
{
.llseek = default_llseek
};
+static ssize_t radeon_ttm_gtt_read(struct file *f, char __user *buf,
+ size_t size, loff_t *pos)
+{
+ struct radeon_device *rdev = f->private_data;
+ ssize_t result = 0;
+ int r;
+
+ while (size) {
+ loff_t p = *pos / PAGE_SIZE;
+ unsigned off = *pos & ~PAGE_MASK;
+ ssize_t cur_size = min(size, PAGE_SIZE - off);
+ struct page *page;
+ void *ptr;
+
+ if (p >= rdev->gart.num_cpu_pages)
+ return result;
+
+ page = rdev->gart.pages[p];
+ if (page) {
+ ptr = kmap(page);
+ ptr += off;
+
+ r = copy_to_user(buf, ptr, cur_size);
+ kunmap(rdev->gart.pages[p]);
+ } else
+ r = clear_user(buf, cur_size);
+
+ if (r)
+ return -EFAULT;
+
+ result += cur_size;
+ buf += cur_size;
+ *pos += cur_size;
+ size -= cur_size;
+ }
+
+ return result;
+}
+
+static const struct file_operations radeon_ttm_gtt_fops = {
+ .owner = THIS_MODULE,
+ .open = radeon_ttm_mem_open,
+ .read = radeon_ttm_gtt_read,
+ .llseek = default_llseek
+};
+
#endif
static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
@@ -931,6 +977,12 @@ static int radeon_ttm_debugfs_init(struct radeon_device
*rdev)
return PTR_ERR(ent);
rdev->mman.vram = ent;
+ ent = debugfs_create_file("radeon_gtt", S_IFREG | S_IRUGO, root,
+ rdev, &radeon_ttm_gtt_fops);
+ if (IS_ERR(ent))
+ return PTR_ERR(ent);
+ rdev->mman.gtt = ent;
+
count = ARRAY_SIZE(radeon_ttm_debugfs_list);
#ifdef CONFIG_SWIOTLB
@@ -951,5 +1003,8 @@ static void radeon_ttm_debugfs_fini(struct radeon_device
*rdev)
debugfs_remove(rdev->mman.vram);
rdev->mman.vram = NULL;
+
+ debugfs_remove(rdev->mman.gtt);
+ rdev->mman.gtt = NULL;
#endif
}
--
1.8.1.2
