drm/radeon: add GART debugfs access v3

v2: add default_llseek
v3: set inode size in the open callback

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 49f210c1479685e75ded794655946a5e438cbfd1..572476b61d89b2adf07d930fa6c7ec074861cd64 100644 (file)
--- 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 a29d7cbd62e714166d6cf7ca3e968893d33723d3..77f5b0c3edb8d8b1f4835620d626c3981171c7a6 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -917,6 +917,60 @@ static const struct file_operations radeon_ttm_vram_fops = {
        .llseek = default_llseek
 };
 
+static int radeon_ttm_gtt_open(struct inode *inode, struct file *filep)
+{
+       struct radeon_device *rdev = inode->i_private;
+       i_size_write(inode, rdev->mc.gtt_size);
+       filep->private_data = inode->i_private;
+       return 0;
+}
+
+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_gtt_open,
+       .read = radeon_ttm_gtt_read,
+       .llseek = default_llseek
+};
+
 #endif
 
 static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
@@ -933,6 +987,12 @@ 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
@@ -953,5 +1013,8 @@ 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
 }