[PATCH v2 5/6] drm: Introduce DRIVER_LEGACY feature

[Frank Binns <frank.binns@imgtec.com>]

From: Thierry Reding <treding@nvidia.com>

Currently drivers that set the DRIVER_MODESET feature are considered to
be non-legacy drivers. At the same time DRIVER_MODESET implies that the
mode-setting IOCTLs are available. It is therefore not possible to
distinguish between a non-legacy driver with full mode-setting support
and a non-legacy driver without mode-setting functionality.

To separate the meaning of "legacy" and "modeset", a new driver feature
is introduced: DRIVER_LEGACY. The meaning of DRIVER_MODESET can then be
changed to apply to the mode-setting functionality only, irrespective
of whether it is legacy or not.

Mark all legacy drivers appropriately.

Signed-off-by: Thierry Reding <treding@nvidia.com>

v2:
- Rebase
- Add legacy flag to r128
- Don't add legacy flag to radeon
- Build fix for tdfx (use the correct field name)
- Add documentation to drm-internals

Signed-off-by: Frank Binns <frank.binns@imgtec.com>
---
I wasn't totally sure what to do with regards to authorship and sign-off
as I'd like to give credit where it's due. Feel free to tell me if I got
it wrong :)

 Documentation/gpu/drm-internals.rst | 9 ++++++---
 drivers/gpu/drm/i810/i810_drv.c     | 3 ++-
 drivers/gpu/drm/mga/mga_drv.c       | 3 ++-
 drivers/gpu/drm/r128/r128_drv.c     | 3 ++-
 drivers/gpu/drm/savage/savage_drv.c | 2 +-
 drivers/gpu/drm/sis/sis_drv.c       | 2 +-
 drivers/gpu/drm/tdfx/tdfx_drv.c     | 1 +
 drivers/gpu/drm/via/via_drv.c       | 2 +-
 include/drm/drmP.h                  | 1 +
 9 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst
index 4f71765..97b458e 100644
--- a/Documentation/gpu/drm-internals.rst
+++ b/Documentation/gpu/drm-internals.rst
@@ -95,6 +95,9 @@ DRIVER_ATOMIC
     implement appropriate obj->atomic_get_property() vfuncs for any
     modeset objects with driver specific properties.
 
+DRIVER_LEGACY
+    Driver supports user mode setting interfaces (UMS). Deprecated.
+
 Major, Minor and Patchlevel
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -337,9 +340,9 @@ how the ioctl is allowed to be called.
    device
 
 -  DRM_UNLOCKED - The ioctl handler will be called without locking the
-   DRM global mutex. This is the enforced default for kms drivers (i.e.
-   using the DRIVER_MODESET flag) and hence shouldn't be used any more
-   for new drivers.
+   DRM global mutex. This is the enforced default for drivers that don't
+   support UMS (i.e. using the DRIVER_LEGACY flag) and hence shouldn't
+   be used any more for new drivers.
 
 .. kernel-doc:: drivers/gpu/drm/drm_ioctl.c
    :export:
diff --git a/drivers/gpu/drm/i810/i810_drv.c b/drivers/gpu/drm/i810/i810_drv.c
index 44f4a13..8c3c04a 100644
--- a/drivers/gpu/drm/i810/i810_drv.c
+++ b/drivers/gpu/drm/i810/i810_drv.c
@@ -58,7 +58,8 @@ static const struct file_operations i810_driver_fops = {
 static struct drm_driver driver = {
 	.driver_features =
 	    DRIVER_USE_AGP |
-	    DRIVER_HAVE_DMA,
+	    DRIVER_HAVE_DMA |
+	    DRIVER_LEGACY,
 	.dev_priv_size = sizeof(drm_i810_buf_priv_t),
 	.load = i810_driver_load,
 	.lastclose = i810_driver_lastclose,
diff --git a/drivers/gpu/drm/mga/mga_drv.c b/drivers/gpu/drm/mga/mga_drv.c
index 5e2f131..06aafdc 100644
--- a/drivers/gpu/drm/mga/mga_drv.c
+++ b/drivers/gpu/drm/mga/mga_drv.c
@@ -59,7 +59,8 @@ static const struct file_operations mga_driver_fops = {
 static struct drm_driver driver = {
 	.driver_features =
 	    DRIVER_USE_AGP | DRIVER_PCI_DMA |
-	    DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
+	    DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED |
+	    DRIVER_LEGACY,
 	.dev_priv_size = sizeof(drm_mga_buf_priv_t),
 	.load = mga_driver_load,
 	.unload = mga_driver_unload,
diff --git a/drivers/gpu/drm/r128/r128_drv.c b/drivers/gpu/drm/r128/r128_drv.c
index c57b4de..5a63425 100644
--- a/drivers/gpu/drm/r128/r128_drv.c
+++ b/drivers/gpu/drm/r128/r128_drv.c
@@ -57,7 +57,8 @@ static const struct file_operations r128_driver_fops = {
 static struct drm_driver driver = {
 	.driver_features =
 	    DRIVER_USE_AGP | DRIVER_PCI_DMA | DRIVER_SG |
-	    DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED,
+	    DRIVER_HAVE_DMA | DRIVER_HAVE_IRQ | DRIVER_IRQ_SHARED |
+	    DRIVER_LEGACY,
 	.dev_priv_size = sizeof(drm_r128_buf_priv_t),
 	.load = r128_driver_load,
 	.preclose = r128_driver_preclose,
diff --git a/drivers/gpu/drm/savage/savage_drv.c b/drivers/gpu/drm/savage/savage_drv.c
index 21aed1f..3b80713 100644
--- a/drivers/gpu/drm/savage/savage_drv.c
+++ b/drivers/gpu/drm/savage/savage_drv.c
@@ -50,7 +50,7 @@ static const struct file_operations savage_driver_fops = {
 
 static struct drm_driver driver = {
 	.driver_features =
-	    DRIVER_USE_AGP | DRIVER_HAVE_DMA | DRIVER_PCI_DMA,
+	    DRIVER_USE_AGP | DRIVER_HAVE_DMA | DRIVER_PCI_DMA | DRIVER_LEGACY,
 	.dev_priv_size = sizeof(drm_savage_buf_priv_t),
 	.load = savage_driver_load,
 	.firstopen = savage_driver_firstopen,
diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c
index 79bce76..ae98398 100644
--- a/drivers/gpu/drm/sis/sis_drv.c
+++ b/drivers/gpu/drm/sis/sis_drv.c
@@ -102,7 +102,7 @@ static void sis_driver_postclose(struct drm_device *dev, struct drm_file *file)
 }
 
 static struct drm_driver driver = {
-	.driver_features = DRIVER_USE_AGP,
+	.driver_features = DRIVER_USE_AGP | DRIVER_LEGACY,
 	.load = sis_driver_load,
 	.unload = sis_driver_unload,
 	.open = sis_driver_open,
diff --git a/drivers/gpu/drm/tdfx/tdfx_drv.c b/drivers/gpu/drm/tdfx/tdfx_drv.c
index fab5ebc..f418892 100644
--- a/drivers/gpu/drm/tdfx/tdfx_drv.c
+++ b/drivers/gpu/drm/tdfx/tdfx_drv.c
@@ -56,6 +56,7 @@ static const struct file_operations tdfx_driver_fops = {
 };
 
 static struct drm_driver driver = {
+	.driver_features = DRIVER_LEGACY,
 	.set_busid = drm_pci_set_busid,
 	.fops = &tdfx_driver_fops,
 	.name = DRIVER_NAME,
diff --git a/drivers/gpu/drm/via/via_drv.c b/drivers/gpu/drm/via/via_drv.c
index ed8aa8f..de54424 100644
--- a/drivers/gpu/drm/via/via_drv.c
+++ b/drivers/gpu/drm/via/via_drv.c
@@ -73,7 +73,7 @@ static const struct file_operations via_driver_fops = {
 static struct drm_driver driver = {
 	.driver_features =
 	    DRIVER_USE_AGP | DRIVER_HAVE_IRQ |
-	    DRIVER_IRQ_SHARED,
+	    DRIVER_IRQ_SHARED | DRIVER_LEGACY,
 	.load = via_driver_load,
 	.unload = via_driver_unload,
 	.open = via_driver_open,
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 1d39988..b6e21f3 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -157,6 +157,7 @@ void drm_err(const char *format, ...);
 #define DRIVER_RENDER			0x8000
 #define DRIVER_ATOMIC			0x10000
 #define DRIVER_KMS_LEGACY_CONTEXT	0x20000
+#define DRIVER_LEGACY			0x40000
 
 /***********************************************************************/
 /** \name Macros to make printk easier */
-- 
2.7.4

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