r600g: start using drm minor version to enable things.

If the drm minor version is > 9 (i.e. whats in drm-next),
we enable s3tc + texture tiling by default now.

this changes R600_FORCE_TILING to R600_TILING which can
be set to false to disable tiling on working drm.

Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 61 insertions, 6 deletions

diff --git a/src/gallium/winsys/r600/drm/r600_drm.c b/src/gallium/winsys/r600/drm/r600_drm.c
index f5cd48d39c..cd0aa318be 100644
--- a/src/gallium/winsys/r600/drm/r600_drm.c
+++ b/src/gallium/winsys/r600/drm/r600_drm.c
@@ -45,6 +45,10 @@
 #define RADEON_INFO_CLOCK_CRYSTAL_FREQ 0x9
 #endif
 
+#ifndef RADEON_INFO_NUM_BACKENDS
+#define RADEON_INFO_NUM_BACKENDS 0xa
+#endif
+
 enum radeon_family r600_get_family(struct radeon *r600)
 {
 	return r600->family;
@@ -65,6 +69,17 @@ unsigned r600_get_clock_crystal_freq(struct radeon *radeon)
 	return radeon->clock_crystal_freq;
 }
 
+unsigned r600_get_num_backends(struct radeon *radeon)
+{
+	return radeon->num_backends;
+}
+
+unsigned r600_get_minor_version(struct radeon *radeon)
+{
+	return radeon->minor_version;
+}
+
+
 static int radeon_get_device(struct radeon *radeon)
 {
 	struct drm_radeon_info info = {};
@@ -195,6 +210,26 @@ static int radeon_get_clock_crystal_freq(struct radeon *radeon)
 	return 0;
 }
 
+
+static int radeon_get_num_backends(struct radeon *radeon)
+{
+	struct drm_radeon_info info;
+	uint32_t num_backends;
+	int r;
+
+	radeon->device = 0;
+	info.request = RADEON_INFO_NUM_BACKENDS;
+	info.value = (uintptr_t)&num_backends;
+	r = drmCommandWriteRead(radeon->fd, DRM_RADEON_INFO, &info,
+			sizeof(struct drm_radeon_info));
+	if (r)
+		return r;
+
+	radeon->num_backends = num_backends;
+	return 0;
+}
+
+
 static int radeon_init_fence(struct radeon *radeon)
 {
 	radeon->fence = 1;
@@ -211,6 +246,7 @@ static struct radeon *radeon_new(int fd, unsigned device)
 {
 	struct radeon *radeon;
 	int r;
+	drmVersionPtr version;
 
 	radeon = calloc(1, sizeof(*radeon));
 	if (radeon == NULL) {
@@ -219,13 +255,27 @@ static struct radeon *radeon_new(int fd, unsigned device)
 	radeon->fd = fd;
 	radeon->device = device;
 	radeon->refcount = 1;
-	if (fd >= 0) {
-		r = radeon_get_device(radeon);
-		if (r) {
-			fprintf(stderr, "Failed to get device id\n");
-			return radeon_decref(radeon);
-		}
+
+	version = drmGetVersion(radeon->fd);
+	if (version->version_major != 2) {
+		fprintf(stderr, "%s: DRM version is %d.%d.%d but this driver is "
+			"only compatible with 2.x.x\n", __FUNCTION__,
+			version->version_major, version->version_minor,
+			version->version_patchlevel);
+		drmFreeVersion(version);
+		exit(1);
 	}
+
+	radeon->minor_version = version->version_minor;
+
+	drmFreeVersion(version);
+
+	r = radeon_get_device(radeon);
+	if (r) {
+		fprintf(stderr, "Failed to get device id\n");
+		return radeon_decref(radeon);
+	}
+
 	radeon->family = radeon_family_from_device(radeon->device);
 	if (radeon->family == CHIP_UNKNOWN) {
 		fprintf(stderr, "Unknown chipset 0x%04X\n", radeon->device);
@@ -278,6 +328,9 @@ static struct radeon *radeon_new(int fd, unsigned device)
 	/* get the GPU counter frequency, failure is non fatal */
 	radeon_get_clock_crystal_freq(radeon);
 
+	if (radeon->minor_version >= 9)
+		radeon_get_num_backends(radeon);
+
 	radeon->bomgr = r600_bomgr_create(radeon, 1000000);
 	if (radeon->bomgr == NULL) {
 		return NULL;
diff --git a/src/gallium/winsys/r600/drm/r600_priv.h b/src/gallium/winsys/r600/drm/r600_priv.h
index 2d91cd97d6..41c5ee02c3 100644
--- a/src/gallium/winsys/r600/drm/r600_priv.h
+++ b/src/gallium/winsys/r600/drm/r600_priv.h
@@ -50,6 +50,8 @@ struct radeon {
 	unsigned			*cfence;
 	struct r600_bo			*fence_bo;
 	unsigned			clock_crystal_freq;
+	unsigned			num_backends;
+	unsigned                        minor_version;
 };
 
 struct r600_reg {