drm/radeon/kms: Check module arguments to be valid V2

This patch add a function which check module argument to be
valid. On invalid argument it prints a warning and setback
the default value.

V2: Allow 0 for vram limit & agp mode which are the default
value

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

1 files changed, 68 insertions, 5 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 14df3ad64f94..7c6848096bcd 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -546,9 +546,72 @@ void radeon_agp_disable(struct radeon_device *rdev)
         }
 }
 
-/*
- * Radeon device.
- */
+void radeon_check_arguments(struct radeon_device *rdev)
+{
+        /* vramlimit must be a power of two */
+        switch (radeon_vram_limit) {
+        case 0:
+        case 4:
+        case 8:
+        case 16:
+        case 32:
+        case 64:
+        case 128:
+        case 256:
+        case 512:
+        case 1024:
+        case 2048:
+        case 4096:
+                break;
+        default:
+                dev_warn(rdev->dev, "vram limit (%d) must be a power of 2\n",
+                                radeon_vram_limit);
+                radeon_vram_limit = 0;
+                break;
+        }
+        radeon_vram_limit = radeon_vram_limit << 20;
+        /* gtt size must be power of two and greater or equal to 32M */
+        switch (radeon_gart_size) {
+        case 4:
+        case 8:
+        case 16:
+                dev_warn(rdev->dev, "gart size (%d) too small forcing to 512M\n",
+                                radeon_gart_size);
+                radeon_gart_size = 512;
+                break;
+        case 32:
+        case 64:
+        case 128:
+        case 256:
+        case 512:
+        case 1024:
+        case 2048:
+        case 4096:
+                break;
+        default:
+                dev_warn(rdev->dev, "gart size (%d) must be a power of 2\n",
+                                radeon_gart_size);
+                radeon_gart_size = 512;
+                break;
+        }
+        rdev->mc.gtt_size = radeon_gart_size * 1024 * 1024;
+        /* AGP mode can only be -1, 1, 2, 4, 8 */
+        switch (radeon_agpmode) {
+        case -1:
+        case 0:
+        case 1:
+        case 2:
+        case 4:
+        case 8:
+                break;
+        default:
+                dev_warn(rdev->dev, "invalid AGP mode %d (valid mode: "
+                                "-1, 0, 1, 2, 4, 8)\n", radeon_agpmode);
+                radeon_agpmode = 0;
+                break;
+        }
+}
+
 int radeon_device_init(struct radeon_device *rdev,
                        struct drm_device *ddev,
                        struct pci_dev *pdev,
@@ -587,9 +650,9 @@ int radeon_device_init(struct radeon_device *rdev,
 
         /* Set asic functions */
         r = radeon_asic_init(rdev);
-        if (r) {
+        if (r)
                 return r;
-        }
+        radeon_check_arguments(rdev);
 
         if (rdev->flags & RADEON_IS_AGP && radeon_agpmode == -1) {
                 radeon_agp_disable(rdev);