[PATCH] alpha_agpgart_size

This allows to set the AGP aperture size from command line.
Default is 64Mb.

Ivan.

arch/alpha/kernel/core_marvel.c

@@ -874,8 +874,6 @@ marvel_node_mem_size(int nid)
 #include <linux/slab.h>
 #include <linux/delay.h>
 
-#define MARVEL_AGP_APER_SIZE (64 * 1024 * 1024)
-
 struct marvel_agp_aperture {
 	struct pci_iommu_arena *arena;
 	long pg_start;
@@ -887,11 +885,14 @@ marvel_agp_setup(alpha_agp_info *agp)
 {
 	struct marvel_agp_aperture *aper;
 
+	if (!alpha_agpgart_size)
+		return -ENOMEM;
+
 	aper = kmalloc(sizeof(*aper), GFP_KERNEL);
 	if (aper == NULL) return -ENOMEM;
 
 	aper->arena = agp->hose->sg_pci;
-	aper->pg_count = MARVEL_AGP_APER_SIZE / PAGE_SIZE;
+	aper->pg_count = alpha_agpgart_size / PAGE_SIZE;
 	aper->pg_start = iommu_reserve(aper->arena, aper->pg_count,
 				       aper->pg_count - 1);
 

arch/alpha/kernel/core_titan.c

@@ -580,8 +580,6 @@ EXPORT_SYMBOL(titan_iounmap);
 #include <linux/slab.h>
 #include <linux/delay.h>
 
-#define TITAN_AGP_APER_SIZE (64 * 1024 * 1024)
-
 struct titan_agp_aperture {
 	struct pci_iommu_arena *arena;
 	long pg_start;
@@ -593,12 +591,15 @@ titan_agp_setup(alpha_agp_info *agp)
 {
 	struct titan_agp_aperture *aper;
 
+	if (!alpha_agpgart_size)
+		return -ENOMEM;
+
 	aper = kmalloc(sizeof(struct titan_agp_aperture), GFP_KERNEL);
 	if (aper == NULL)
 		return -ENOMEM;
 
 	aper->arena = agp->hose->sg_pci;
-	aper->pg_count = TITAN_AGP_APER_SIZE / PAGE_SIZE;
+	aper->pg_count = alpha_agpgart_size / PAGE_SIZE;
 	aper->pg_start = iommu_reserve(aper->arena, aper->pg_count,
 				       aper->pg_count - 1);
 	if (aper->pg_start < 0) {

arch/alpha/kernel/pci_impl.h

@@ -71,6 +71,8 @@ struct pci_iommu_arena;
 
 #define IRONGATE_DEFAULT_MEM_BASE ((256*8-16)*1024*1024)
 
+#define DEFAULT_AGP_APER_SIZE	(64*1024*1024)
+
 /* 
  * A small note about bridges and interrupts.  The DECchip 21050 (and
  * later) adheres to the PCI-PCI bridge specification.  This says that
@@ -153,6 +155,8 @@ extern struct pci_controller *pci_isa_hose;
 /* Indicate that we trust the console to configure things properly.  */
 extern int pci_probe_only;
 
+extern unsigned long alpha_agpgart_size;
+
 extern void common_init_pci(void);
 extern u8 common_swizzle(struct pci_dev *, u8 *);
 extern struct pci_controller *alloc_pci_controller(void);

arch/alpha/kernel/setup.c

@@ -89,6 +89,9 @@ int srmcons_output = 0;
 /* Enforce a memory size limit; useful for testing. By default, none. */
 unsigned long mem_size_limit = 0;
 
+/* Set AGP GART window size (0 means disabled). */
+unsigned long alpha_agpgart_size = DEFAULT_AGP_APER_SIZE;
+
 #ifdef CONFIG_ALPHA_GENERIC
 struct alpha_machine_vector alpha_mv;
 int alpha_using_srm;
@@ -577,6 +580,11 @@ setup_arch(char **cmdline_p)
 			srmcons_output = 1;
 			continue;
 		}
+		if (strncmp(p, "gartsize=", 9) == 0) {
+			alpha_agpgart_size =
+				get_mem_size_limit(p+9) << PAGE_SHIFT;
+			continue;
+		}
 	}
 
 	/* Replace the command line, now that we've killed it with strsep.  */