Re: [BUG] Xserver startup locks system... git bisect results

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

Finally fixes the radeon memory mapping bug that was incorrectly
fixed by the previous patch. This time, we use the actual vram
size as the size to calculate how far to move the AGP aperture
from the framebuffer in card's memory space. If there are still
issues with this patch, they are due to bugs in the X driver that
I'm working on fixing too.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

Index: linux-work/drivers/char/drm/radeon_cp.c
===================================================================
--- linux-work.orig/drivers/char/drm/radeon_cp.c	2005-12-13 20:23:00.000000000 +1100
+++ linux-work/drivers/char/drm/radeon_cp.c	2005-12-16 16:17:30.000000000 +1100
@@ -1312,6 +1312,8 @@
 static int radeon_do_init_cp(drm_device_t * dev, drm_radeon_init_t * init)
 {
 	drm_radeon_private_t *dev_priv = dev->dev_private;;
+	unsigned int mem_size;
+
 	DRM_DEBUG("\n");
 
 	dev_priv->is_pci = init->is_pci;
@@ -1521,8 +1523,11 @@
 					  + dev_priv->fb_location) >> 10));
 
 	dev_priv->gart_size = init->gart_size;
-	dev_priv->gart_vm_start = dev_priv->fb_location
-	    + RADEON_READ(RADEON_CONFIG_APER_SIZE) * 2;
+
+	mem_size = RADEON_READ(RADEON_CONFIG_MEMSIZE);
+	if (mem_size == 0)
+		mem_size = 0x800000;
+	dev_priv->gart_vm_start = dev_priv->fb_location + mem_size;
 
 #if __OS_HAS_AGP
 	if (!dev_priv->is_pci)
Index: linux-work/drivers/char/drm/radeon_drv.h
===================================================================
--- linux-work.orig/drivers/char/drm/radeon_drv.h	2005-11-25 15:03:35.000000000 +1100
+++ linux-work/drivers/char/drm/radeon_drv.h	2005-12-16 16:14:43.000000000 +1100
@@ -379,6 +379,7 @@
 #	define RADEON_PLL_WR_EN			(1 << 7)
 #define RADEON_CLOCK_CNTL_INDEX		0x0008
 #define RADEON_CONFIG_APER_SIZE		0x0108
+#define RADEON_CONFIG_MEMSIZE		0x00f8
 #define RADEON_CRTC_OFFSET		0x0224
 #define RADEON_CRTC_OFFSET_CNTL		0x0228
 #	define RADEON_CRTC_TILE_EN		(1 << 15)