X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=arch%2Fx86%2Fkernel%2Faperture_64.c;h=608152a2a05ea0931512542999272a9716562e9a;hb=4de0d4a6d173351b023ab2855c3d331146a418e5;hp=5b6992799c9d20882bab7fd1efa0f0772ad77243;hpb=97a4649d6ffce4a5d7f5ce018d87a6cefcb4ad03;p=linux-2.6-omap-h63xx.git

diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 5b6992799c9..608152a2a05 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -1,12 +1,12 @@
-/* 
+/*
  * Firmware replacement code.
- * 
+ *
  * Work around broken BIOSes that don't set an aperture or only set the
- * aperture in the AGP bridge. 
- * If all fails map the aperture over some low memory.  This is cheaper than 
- * doing bounce buffering. The memory is lost. This is done at early boot 
- * because only the bootmem allocator can allocate 32+MB. 
- * 
+ * aperture in the AGP bridge.
+ * If all fails map the aperture over some low memory.  This is cheaper than
+ * doing bounce buffering. The memory is lost. This is done at early boot
+ * because only the bootmem allocator can allocate 32+MB.
+ *
  * Copyright 2002 Andi Kleen, SuSE Labs.
  */
 #include <linux/kernel.h>
@@ -30,7 +30,7 @@ int gart_iommu_aperture_disabled __initdata = 0;
 int gart_iommu_aperture_allowed __initdata = 0;
 
 int fallback_aper_order __initdata = 1; /* 64MB */
-int fallback_aper_force __initdata = 0; 
+int fallback_aper_force __initdata = 0;
 
 int fix_aperture __initdata = 1;
 
@@ -49,167 +49,270 @@ static void __init insert_aperture_resource(u32 aper_base, u32 aper_size)
 /* This code runs before the PCI subsystem is initialized, so just
    access the northbridge directly. */
 
-static u32 __init allocate_aperture(void) 
+static u32 __init allocate_aperture(void)
 {
 	u32 aper_size;
-	void *p; 
+	void *p;
 
-	if (fallback_aper_order > 7) 
-		fallback_aper_order = 7; 
-	aper_size = (32 * 1024 * 1024) << fallback_aper_order; 
+	if (fallback_aper_order > 7)
+		fallback_aper_order = 7;
+	aper_size = (32 * 1024 * 1024) << fallback_aper_order;
 
-	/* 
-	 * Aperture has to be naturally aligned. This means an 2GB aperture won't
-	 * have much chance of finding a place in the lower 4GB of memory.
-	 * Unfortunately we cannot move it up because that would make the
-	 * IOMMU useless.
+	/*
+	 * Aperture has to be naturally aligned. This means a 2GB aperture
+	 * won't have much chance of finding a place in the lower 4GB of
+	 * memory. Unfortunately we cannot move it up because that would
+	 * make the IOMMU useless.
 	 */
 	p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
 	if (!p || __pa(p)+aper_size > 0xffffffff) {
-		printk("Cannot allocate aperture memory hole (%p,%uK)\n",
-		       p, aper_size>>10);
+		printk(KERN_ERR
+			"Cannot allocate aperture memory hole (%p,%uK)\n",
+				p, aper_size>>10);
 		if (p)
 			free_bootmem(__pa(p), aper_size);
 		return 0;
 	}
-	printk("Mapping aperture over %d KB of RAM @ %lx\n",
-	       aper_size >> 10, __pa(p)); 
+	printk(KERN_INFO "Mapping aperture over %d KB of RAM @ %lx\n",
+			aper_size >> 10, __pa(p));
 	insert_aperture_resource((u32)__pa(p), aper_size);
-	return (u32)__pa(p); 
+
+	return (u32)__pa(p);
 }
 
 static int __init aperture_valid(u64 aper_base, u32 aper_size)
-{ 
-	if (!aper_base) 
-		return 0;
-	if (aper_size < 64*1024*1024) { 
-		printk("Aperture too small (%d MB)\n", aper_size>>20);
+{
+	if (!aper_base)
 		return 0;
-	}
+
 	if (aper_base + aper_size > 0x100000000UL) {
-		printk("Aperture beyond 4GB. Ignoring.\n");
-		return 0; 
+		printk(KERN_ERR "Aperture beyond 4GB. Ignoring.\n");
+		return 0;
 	}
 	if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
-		printk("Aperture pointing to e820 RAM. Ignoring.\n");
-		return 0; 
-	} 
+		printk(KERN_ERR "Aperture pointing to e820 RAM. Ignoring.\n");
+		return 0;
+	}
+	if (aper_size < 64*1024*1024) {
+		printk(KERN_ERR "Aperture too small (%d MB)\n", aper_size>>20);
+		return 0;
+	}
+
 	return 1;
-} 
+}
 
 /* Find a PCI capability */
-static __u32 __init find_cap(int num, int slot, int func, int cap) 
-{ 
-	u8 pos;
+static __u32 __init find_cap(int num, int slot, int func, int cap)
+{
 	int bytes;
-	if (!(read_pci_config_16(num,slot,func,PCI_STATUS) & PCI_STATUS_CAP_LIST))
+	u8 pos;
+
+	if (!(read_pci_config_16(num, slot, func, PCI_STATUS) &
+						PCI_STATUS_CAP_LIST))
 		return 0;
-	pos = read_pci_config_byte(num,slot,func,PCI_CAPABILITY_LIST);
-	for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) { 
+
+	pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST);
+	for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
 		u8 id;
-		pos &= ~3; 
-		id = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_ID);
+
+		pos &= ~3;
+		id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID);
 		if (id == 0xff)
 			break;
-		if (id == cap) 
-			return pos; 
-		pos = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_NEXT); 
-	} 
+		if (id == cap)
+			return pos;
+		pos = read_pci_config_byte(num, slot, func,
+						pos+PCI_CAP_LIST_NEXT);
+	}
 	return 0;
-} 
+}
 
 /* Read a standard AGPv3 bridge header */
 static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
-{ 
+{
 	u32 apsize;
 	u32 apsizereg;
 	int nbits;
 	u32 aper_low, aper_hi;
 	u64 aper;
 
-	printk("AGP bridge at %02x:%02x:%02x\n", num, slot, func);
-	apsizereg = read_pci_config_16(num,slot,func, cap + 0x14);
+	printk(KERN_INFO "AGP bridge at %02x:%02x:%02x\n", num, slot, func);
+	apsizereg = read_pci_config_16(num, slot, func, cap + 0x14);
 	if (apsizereg == 0xffffffff) {
-		printk("APSIZE in AGP bridge unreadable\n");
+		printk(KERN_ERR "APSIZE in AGP bridge unreadable\n");
 		return 0;
 	}
 
 	apsize = apsizereg & 0xfff;
 	/* Some BIOS use weird encodings not in the AGPv3 table. */
-	if (apsize & 0xff) 
-		apsize |= 0xf00; 
+	if (apsize & 0xff)
+		apsize |= 0xf00;
 	nbits = hweight16(apsize);
 	*order = 7 - nbits;
 	if ((int)*order < 0) /* < 32MB */
 		*order = 0;
-	
-	aper_low = read_pci_config(num,slot,func, 0x10);
-	aper_hi = read_pci_config(num,slot,func,0x14);
+
+	aper_low = read_pci_config(num, slot, func, 0x10);
+	aper_hi = read_pci_config(num, slot, func, 0x14);
 	aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
 
-	printk("Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n", 
-	       aper, 32 << *order, apsizereg);
+	printk(KERN_INFO "Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n",
+			aper, 32 << *order, apsizereg);
 
 	if (!aperture_valid(aper, (32*1024*1024) << *order))
-	    return 0;
-	return (u32)aper; 
-} 
-
-/* Look for an AGP bridge. Windows only expects the aperture in the
-   AGP bridge and some BIOS forget to initialize the Northbridge too.
-   Work around this here. 
-
-   Do an PCI bus scan by hand because we're running before the PCI
-   subsystem. 
+		return 0;
+	return (u32)aper;
+}
 
-   All K8 AGP bridges are AGPv3 compliant, so we can do this scan
-   generically. It's probably overkill to always scan all slots because
-   the AGP bridges should be always an own bus on the HT hierarchy, 
-   but do it here for future safety. */
+/*
+ * Look for an AGP bridge. Windows only expects the aperture in the
+ * AGP bridge and some BIOS forget to initialize the Northbridge too.
+ * Work around this here.
+ *
+ * Do an PCI bus scan by hand because we're running before the PCI
+ * subsystem.
+ *
+ * All K8 AGP bridges are AGPv3 compliant, so we can do this scan
+ * generically. It's probably overkill to always scan all slots because
+ * the AGP bridges should be always an own bus on the HT hierarchy,
+ * but do it here for future safety.
+ */
 static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
 {
 	int num, slot, func;
 
 	/* Poor man's PCI discovery */
-	for (num = 0; num < 256; num++) { 
-		for (slot = 0; slot < 32; slot++) { 
-			for (func = 0; func < 8; func++) { 
+	for (num = 0; num < 256; num++) {
+		for (slot = 0; slot < 32; slot++) {
+			for (func = 0; func < 8; func++) {
 				u32 class, cap;
 				u8 type;
-				class = read_pci_config(num,slot,func,
+				class = read_pci_config(num, slot, func,
 							PCI_CLASS_REVISION);
 				if (class == 0xffffffff)
-					break; 
-				
-				switch (class >> 16) { 
+					break;
+
+				switch (class >> 16) {
 				case PCI_CLASS_BRIDGE_HOST:
 				case PCI_CLASS_BRIDGE_OTHER: /* needed? */
 					/* AGP bridge? */
-					cap = find_cap(num,slot,func,PCI_CAP_ID_AGP);
+					cap = find_cap(num, slot, func,
+							PCI_CAP_ID_AGP);
 					if (!cap)
 						break;
-					*valid_agp = 1; 
-					return read_agp(num,slot,func,cap,order);
-				} 
-				
+					*valid_agp = 1;
+					return read_agp(num, slot, func, cap,
+							order);
+				}
+
 				/* No multi-function device? */
-				type = read_pci_config_byte(num,slot,func,
+				type = read_pci_config_byte(num, slot, func,
 							       PCI_HEADER_TYPE);
 				if (!(type & 0x80))
 					break;
-			} 
-		} 
+			}
+		}
 	}
-	printk("No AGP bridge found\n"); 
+	printk(KERN_INFO "No AGP bridge found\n");
+
 	return 0;
 }
 
+static int gart_fix_e820 __initdata = 1;
+
+static int __init parse_gart_mem(char *p)
+{
+	if (!p)
+		return -EINVAL;
+
+	if (!strncmp(p, "off", 3))
+		gart_fix_e820 = 0;
+	else if (!strncmp(p, "on", 2))
+		gart_fix_e820 = 1;
+
+	return 0;
+}
+early_param("gart_fix_e820", parse_gart_mem);
+
+void __init early_gart_iommu_check(void)
+{
+	/*
+	 * in case it is enabled before, esp for kexec/kdump,
+	 * previous kernel already enable that. memset called
+	 * by allocate_aperture/__alloc_bootmem_nopanic cause restart.
+	 * or second kernel have different position for GART hole. and new
+	 * kernel could use hole as RAM that is still used by GART set by
+	 * first kernel
+	 * or BIOS forget to put that in reserved.
+	 * try to update e820 to make that region as reserved.
+	 */
+	int fix, num;
+	u32 ctl;
+	u32 aper_size = 0, aper_order = 0, last_aper_order = 0;
+	u64 aper_base = 0, last_aper_base = 0;
+	int aper_enabled = 0, last_aper_enabled = 0;
+
+	if (!early_pci_allowed())
+		return;
+
+	fix = 0;
+	for (num = 24; num < 32; num++) {
+		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
+			continue;
+
+		ctl = read_pci_config(0, num, 3, 0x90);
+		aper_enabled = ctl & 1;
+		aper_order = (ctl >> 1) & 7;
+		aper_size = (32 * 1024 * 1024) << aper_order;
+		aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
+		aper_base <<= 25;
+
+		if ((last_aper_order && aper_order != last_aper_order) ||
+		    (last_aper_base && aper_base != last_aper_base) ||
+		    (last_aper_enabled && aper_enabled != last_aper_enabled)) {
+			fix = 1;
+			break;
+		}
+		last_aper_order = aper_order;
+		last_aper_base = aper_base;
+		last_aper_enabled = aper_enabled;
+	}
+
+	if (!fix && !aper_enabled)
+		return;
+
+	if (!aper_base || !aper_size || aper_base + aper_size > 0x100000000UL)
+		fix = 1;
+
+	if (gart_fix_e820 && !fix && aper_enabled) {
+		if (e820_any_mapped(aper_base, aper_base + aper_size,
+				    E820_RAM)) {
+			/* reserved it, so we can resuse it in second kernel */
+			printk(KERN_INFO "update e820 for GART\n");
+			add_memory_region(aper_base, aper_size, E820_RESERVED);
+			update_e820();
+		}
+		return;
+	}
+
+	/* different nodes have different setting, disable them all at first*/
+	for (num = 24; num < 32; num++) {
+		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
+			continue;
+
+		ctl = read_pci_config(0, num, 3, 0x90);
+		ctl &= ~1;
+		write_pci_config(0, num, 3, 0x90, ctl);
+	}
+
+}
+
 void __init gart_iommu_hole_init(void)
-{ 
-	int fix, num; 
+{
 	u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
 	u64 aper_base, last_aper_base = 0;
-	int valid_agp = 0;
+	int fix, num, valid_agp = 0;
+	int node;
 
 	if (gart_iommu_aperture_disabled || !fix_aperture ||
 	    !early_pci_allowed())
@@ -218,24 +321,26 @@ void __init gart_iommu_hole_init(void)
 	printk(KERN_INFO  "Checking aperture...\n");
 
 	fix = 0;
-	for (num = 24; num < 32; num++) {		
+	node = 0;
+	for (num = 24; num < 32; num++) {
 		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
 			continue;
 
 		iommu_detected = 1;
 		gart_iommu_aperture = 1;
 
-		aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7; 
-		aper_size = (32 * 1024 * 1024) << aper_order; 
+		aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7;
+		aper_size = (32 * 1024 * 1024) << aper_order;
 		aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
-		aper_base <<= 25; 
+		aper_base <<= 25;
+
+		printk(KERN_INFO "Node %d: aperture @ %Lx size %u MB\n",
+				node, aper_base, aper_size >> 20);
+		node++;
 
-		printk("CPU %d: aperture @ %Lx size %u MB\n", num-24, 
-		       aper_base, aper_size>>20);
-		
 		if (!aperture_valid(aper_base, aper_size)) {
-			fix = 1; 
-			break; 
+			fix = 1;
+			break;
 		}
 
 		if ((last_aper_order && aper_order != last_aper_order) ||
@@ -245,55 +350,64 @@ void __init gart_iommu_hole_init(void)
 		}
 		last_aper_order = aper_order;
 		last_aper_base = aper_base;
-	} 
+	}
 
 	if (!fix && !fallback_aper_force) {
 		if (last_aper_base) {
 			unsigned long n = (32 * 1024 * 1024) << last_aper_order;
+
 			insert_aperture_resource((u32)last_aper_base, n);
 		}
-		return; 
+		return;
 	}
 
 	if (!fallback_aper_force)
-		aper_alloc = search_agp_bridge(&aper_order, &valid_agp); 
-		
-	if (aper_alloc) { 
+		aper_alloc = search_agp_bridge(&aper_order, &valid_agp);
+
+	if (aper_alloc) {
 		/* Got the aperture from the AGP bridge */
 	} else if (swiotlb && !valid_agp) {
 		/* Do nothing */
 	} else if ((!no_iommu && end_pfn > MAX_DMA32_PFN) ||
 		   force_iommu ||
 		   valid_agp ||
-		   fallback_aper_force) { 
-		printk("Your BIOS doesn't leave a aperture memory hole\n");
-		printk("Please enable the IOMMU option in the BIOS setup\n");
-		printk("This costs you %d MB of RAM\n",
-		       32 << fallback_aper_order);
+		   fallback_aper_force) {
+		printk(KERN_ERR
+			"Your BIOS doesn't leave a aperture memory hole\n");
+		printk(KERN_ERR
+			"Please enable the IOMMU option in the BIOS setup\n");
+		printk(KERN_ERR
+			"This costs you %d MB of RAM\n",
+				32 << fallback_aper_order);
 
 		aper_order = fallback_aper_order;
 		aper_alloc = allocate_aperture();
-		if (!aper_alloc) { 
-			/* Could disable AGP and IOMMU here, but it's probably
-			   not worth it. But the later users cannot deal with
-			   bad apertures and turning on the aperture over memory
-			   causes very strange problems, so it's better to 
-			   panic early. */
+		if (!aper_alloc) {
+			/*
+			 * Could disable AGP and IOMMU here, but it's
+			 * probably not worth it. But the later users
+			 * cannot deal with bad apertures and turning
+			 * on the aperture over memory causes very
+			 * strange problems, so it's better to panic
+			 * early.
+			 */
 			panic("Not enough memory for aperture");
 		}
-	} else { 
-		return; 
-	} 
+	} else {
+		return;
+	}
 
 	/* Fix up the north bridges */
-	for (num = 24; num < 32; num++) { 		
+	for (num = 24; num < 32; num++) {
 		if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
-			continue;	
-
-		/* Don't enable translation yet. That is done later. 
-		   Assume this BIOS didn't initialise the GART so 
-		   just overwrite all previous bits */ 
-		write_pci_config(0, num, 3, 0x90, aper_order<<1); 
-		write_pci_config(0, num, 3, 0x94, aper_alloc>>25); 
-	} 
-} 
+			continue;
+
+		/*
+		 * Don't enable translation yet. That is done later.
+		 * Assume this BIOS didn't initialise the GART so
+		 * just overwrite all previous bits
+		 */
+		write_pci_config(0, num, 3, 0x90, aper_order<<1);
+		write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
+	}
+}