Am 25.08.2017 um 16:41 schrieb Alex Deucher:
On Fri, Aug 25, 2017 at 9:43 AM, Kent Russell <kent.russ...@amd.com> wrote:
sysfs is more stable, and doesn't require root to access

Signed-off-by: Kent Russell <kent.russ...@amd.com>
Might as well move the vbios binary itself to sysfs as well.  It
should be a stable interface :)

Yeah, but that is nothing a "normal" client application should be interested in.

Additional to that I'm still not sure if a large binary BIOS qualifies as single value per file.

Christian.


Alex

---
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 54 +++++++++++++-----------------
  1 file changed, 23 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index c041496..77929e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -67,7 +67,6 @@ static int amdgpu_debugfs_regs_init(struct amdgpu_device 
*adev);
  static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev);
  static int amdgpu_debugfs_test_ib_ring_init(struct amdgpu_device *adev);
  static int amdgpu_debugfs_vbios_dump_init(struct amdgpu_device *adev);
-static int amdgpu_debugfs_vbios_version_init(struct amdgpu_device *adev);

  static const char *amdgpu_asic_name[] = {
         "TAHITI",
@@ -890,6 +889,20 @@ static uint32_t cail_ioreg_read(struct card_info *info, 
uint32_t reg)
         return r;
  }

+static ssize_t amdgpu_atombios_get_vbios_version(struct device *dev,
+                                                struct device_attribute *attr,
+                                                char *buf)
+{
+       struct drm_device *ddev = dev_get_drvdata(dev);
+       struct amdgpu_device *adev = ddev->dev_private;
+       struct atom_context *ctx = adev->mode_info.atom_context;
+
+       return snprintf(buf, PAGE_SIZE, "%s\n", ctx->vbios_version);
+}
+
+static DEVICE_ATTR(vbios_version, 0444, amdgpu_atombios_get_vbios_version,
+                  NULL);
+
  /**
   * amdgpu_atombios_fini - free the driver info and callbacks for atombios
   *
@@ -909,6 +922,7 @@ static void amdgpu_atombios_fini(struct amdgpu_device *adev)
         adev->mode_info.atom_context = NULL;
         kfree(adev->mode_info.atom_card_info);
         adev->mode_info.atom_card_info = NULL;
+       device_remove_file(adev->dev, &dev_attr_vbios_version);
  }

  /**
@@ -925,6 +939,7 @@ static int amdgpu_atombios_init(struct amdgpu_device *adev)
  {
         struct card_info *atom_card_info =
             kzalloc(sizeof(struct card_info), GFP_KERNEL);
+       int ret;

         if (!atom_card_info)
                 return -ENOMEM;
@@ -961,6 +976,13 @@ static int amdgpu_atombios_init(struct amdgpu_device *adev)
                 amdgpu_atombios_scratch_regs_init(adev);
                 amdgpu_atombios_allocate_fb_scratch(adev);
         }
+
+       ret = device_create_file(adev->dev, &dev_attr_vbios_version);
+       if (ret) {
+               DRM_ERROR("Failed to create device file for VBIOS version\n");
+               return ret;
+       }
+
         return 0;
  }

@@ -2256,10 +2278,6 @@ int amdgpu_device_init(struct amdgpu_device *adev,
         if (r)
                 DRM_ERROR("Creating vbios dump debugfs failed (%d).\n", r);

-       r = amdgpu_debugfs_vbios_version_init(adev);
-       if (r)
-               DRM_ERROR("Creating vbios version debugfs failed (%d).\n", r);
-
         if ((amdgpu_testing & 1)) {
                 if (adev->accel_working)
                         amdgpu_test_moves(adev);
@@ -3851,39 +3869,17 @@ static int amdgpu_debugfs_get_vbios_dump(struct 
seq_file *m, void *data)
         return 0;
  }

-static int amdgpu_debugfs_get_vbios_version(struct seq_file *m, void *data)
-{
-       struct drm_info_node *node = (struct drm_info_node *) m->private;
-       struct drm_device *dev = node->minor->dev;
-       struct amdgpu_device *adev = dev->dev_private;
-       struct atom_context *ctx = adev->mode_info.atom_context;
-
-       seq_printf(m, "%s\n", ctx->vbios_version);
-       return 0;
-}
-
  static const struct drm_info_list amdgpu_vbios_dump_list[] = {
                 {"amdgpu_vbios",
                  amdgpu_debugfs_get_vbios_dump,
                  0, NULL},
  };

-static const struct drm_info_list amdgpu_vbios_version_list[] = {
-               {"amdgpu_vbios_version",
-                amdgpu_debugfs_get_vbios_version,
-                0, NULL},
-};
-
  static int amdgpu_debugfs_vbios_dump_init(struct amdgpu_device *adev)
  {
         return amdgpu_debugfs_add_files(adev,
                                         amdgpu_vbios_dump_list, 1);
  }
-static int amdgpu_debugfs_vbios_version_init(struct amdgpu_device *adev)
-{
-       return amdgpu_debugfs_add_files(adev,
-                                       amdgpu_vbios_version_list, 1);
-}
  #else
  static int amdgpu_debugfs_test_ib_ring_init(struct amdgpu_device *adev)
  {
@@ -3897,9 +3893,5 @@ static int amdgpu_debugfs_vbios_dump_init(struct 
amdgpu_device *adev)
  {
         return 0;
  }
-static int amdgpu_debugfs_vbios_version_init(struct amdgpu_device *adev)
-{
-       return 0;
-}
  static void amdgpu_debugfs_regs_cleanup(struct amdgpu_device *adev) { }
  #endif
--
2.7.4

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