[PATCH 06/53] drm/radeon: default to 1024M gart size on rv770+

[Alex Deucher]

Newer asics have a lot of vram so it's less of an
issue to waste a little more space for the gart
page table.  This gives us some additional gart space
before having to migrate to non-gart system ram
for games, etc. where we use up most of vram.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/radeon/radeon_device.c | 22 +++++++++++++++++-----
 drivers/gpu/drm/radeon/radeon_drv.c    |  4 ++--
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c 
b/drivers/gpu/drm/radeon/radeon_device.c
index 63398ae..e887641 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -1003,16 +1003,28 @@ static void radeon_check_arguments(struct radeon_device 
*rdev)
                radeon_vram_limit = 0;
        }

+       if (radeon_gart_size == -1) {
+               /* default to a larger gart size on newer asics */
+               if (rdev->family >= CHIP_RV770)
+                       radeon_gart_size = 1024;
+               else
+                       radeon_gart_size = 512;
+       }
        /* gtt size must be power of two and greater or equal to 32M */
        if (radeon_gart_size < 32) {
-               dev_warn(rdev->dev, "gart size (%d) too small forcing to 
512M\n",
+               dev_warn(rdev->dev, "gart size (%d) too small\n",
                                radeon_gart_size);
-               radeon_gart_size = 512;
-
+               if (rdev->family >= CHIP_RV770)
+                       radeon_gart_size = 1024;
+               else
+                       radeon_gart_size = 512;
        } else if (!radeon_check_pot_argument(radeon_gart_size)) {
                dev_warn(rdev->dev, "gart size (%d) must be a power of 2\n",
                                radeon_gart_size);
-               radeon_gart_size = 512;
+               if (rdev->family >= CHIP_RV770)
+                       radeon_gart_size = 1024;
+               else
+                       radeon_gart_size = 512;
        }
        rdev->mc.gtt_size = (uint64_t)radeon_gart_size << 20;

@@ -1144,7 +1156,7 @@ int radeon_device_init(struct radeon_device *rdev,
        rdev->family = flags & RADEON_FAMILY_MASK;
        rdev->is_atom_bios = false;
        rdev->usec_timeout = RADEON_MAX_USEC_TIMEOUT;
-       rdev->mc.gtt_size = radeon_gart_size * 1024 * 1024;
+       rdev->mc.gtt_size = 512 * 1024 * 1024;
        rdev->accel_working = false;
        /* set up ring ids */
        for (i = 0; i < RADEON_NUM_RINGS; i++) {
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c 
b/drivers/gpu/drm/radeon/radeon_drv.c
index 29876b1..62bd176 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -154,7 +154,7 @@ int radeon_dynclks = -1;
 int radeon_r4xx_atom = 0;
 int radeon_agpmode = 0;
 int radeon_vram_limit = 0;
-int radeon_gart_size = 512; /* default gart size */
+int radeon_gart_size = -1; /* auto */
 int radeon_benchmarking = 0;
 int radeon_testing = 0;
 int radeon_connector_table = 0;
@@ -187,7 +187,7 @@ module_param_named(vramlimit, radeon_vram_limit, int, 0600);
 MODULE_PARM_DESC(agpmode, "AGP Mode (-1 == PCI)");
 module_param_named(agpmode, radeon_agpmode, int, 0444);

-MODULE_PARM_DESC(gartsize, "Size of PCIE/IGP gart to setup in megabytes (32, 
64, etc)");
+MODULE_PARM_DESC(gartsize, "Size of PCIE/IGP gart to setup in megabytes (32, 
64, etc., -1 = auto)");
 module_param_named(gartsize, radeon_gart_size, int, 0600);

 MODULE_PARM_DESC(benchmark, "Run benchmark");
-- 
1.8.3.1