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Subject[PATCH] x86_64: reserve dma32 early for gart

[PATCH] x86_64: reserve dma32 early for gart

one system with 256g when numa is disabled said:

Your BIOS doesn't leave a aperture memory hole
Please enable the IOMMU option in the BIOS setup
This costs you 64 MB of RAM
Cannot allocate aperture memory hole (ffff8101c0000000,65536K)
Kernel panic - not syncing: Not enough memory for aperture
Pid: 0, comm: swapper Not tainted 2.6.25-rc4-x86-latest.git #33
Call Trace:
[<ffffffff84037c62>] panic+0xb2/0x190
[<ffffffff840381fc>] ? release_console_sem+0x7c/0x250
[<ffffffff847b1628>] ? __alloc_bootmem_nopanic+0x48/0x90
[<ffffffff847b0ac9>] ? free_bootmem+0x29/0x50
[<ffffffff847ac1f7>] gart_iommu_hole_init+0x5e7/0x680
[<ffffffff847b255b>] ? alloc_large_system_hash+0x16b/0x310
[<ffffffff84506a2f>] ? _etext+0x0/0x1
[<ffffffff847a2e8c>] pci_iommu_alloc+0x1c/0x40
[<ffffffff847ac795>] mem_init+0x45/0x1a0
[<ffffffff8479ff35>] start_kernel+0x295/0x380
[<ffffffff8479f1c2>] _sinittext+0x1c2/0x230
the root cause is : memmap PMD is too big,
[ffffe200e0600000-ffffe200e07fffff] PMD ->ffff81383c000000 on node 0
almost near 4G..., and vmemmap_alloc_block will use up the ram under 4G.
solution will be:
1. make memmap allocation get memory above 4G...
2. reserve some dma32 range early before we try to set up memmap for all.
and release that before pci_iommu_alloc, so gart or swiotlb could get some
range under 4g limit for sure.

the patch is using method 2.
because method1 may need more code to handle SPARSEMEM and SPASEMEM_VMEMMAP

will get
Your BIOS doesn't leave a aperture memory hole
Please enable the IOMMU option in the BIOS setup
This costs you 64 MB of RAM
Mapping aperture over 65536 KB of RAM @ 4000000
Memory: 264245736k/268959744k available (8484k kernel code, 4187464k reserved, 4004k data, 724k init)
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

Index: linux-2.6/arch/x86/kernel/pci-dma_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/pci-dma_64.c
+++ linux-2.6/arch/x86/kernel/pci-dma_64.c
@@ -8,6 +8,8 @@
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/dmar.h>
+#include <linux/bootmem.h>
+#include <asm/proto.h>
#include <asm/io.h>
#include <asm/gart.h>
#include <asm/calgary.h>
@@ -286,8 +288,55 @@ static __init int iommu_setup(char *p)
}
early_param("iommu", iommu_setup);

+static __initdata void *dma32_bootmem_ptr;
+static unsigned long dma32_bootmem_size __initdata = (128ULL<<20);
+
+static int __init parse_dma32_size_opt(char *p)
+{
+ if (!p)
+ return -EINVAL;
+ dma32_bootmem_size = memparse(p, &p);
+ return 0;
+}
+early_param("dma32_size", parse_dma32_size_opt);
+
+void __init dma32_reserve_bootmem(void)
+{
+ unsigned long size, align;
+ if (end_pfn <= MAX_DMA32_PFN)
+ return;
+
+ align = 64ULL<<20;
+ size = round_up(dma32_bootmem_size, align);
+ dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align,
+ __pa(MAX_DMA_ADDRESS));
+ if (dma32_bootmem_ptr)
+ dma32_bootmem_size = size;
+ else
+ dma32_bootmem_size = 0;
+}
+static void __init dma32_free_bootmem(void)
+{
+ int node;
+
+ if (end_pfn <= MAX_DMA32_PFN)
+ return;
+
+ if (!dma32_bootmem_ptr)
+ return;
+
+ for_each_online_node(node)
+ free_bootmem_node(NODE_DATA(node), __pa(dma32_bootmem_ptr),
+ dma32_bootmem_size);
+
+ dma32_bootmem_ptr = NULL;
+ dma32_bootmem_size = 0;
+}
+
void __init pci_iommu_alloc(void)
{
+ /* free the range so iommu could get some range less than 4G */
+ dma32_free_bootmem();
/*
* The order of these functions is important for
* fall-back/fail-over reasons
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -401,6 +401,8 @@ void __init setup_arch(char **cmdline_p)

early_res_to_bootmem();

+ dma32_reserve_bootmem();
+
#ifdef CONFIG_ACPI_SLEEP
/*
* Reserve low memory region for sleep support.
Index: linux-2.6/include/asm-x86/pci_64.h
===================================================================
--- linux-2.6.orig/include/asm-x86/pci_64.h
+++ linux-2.6/include/asm-x86/pci_64.h
@@ -25,6 +25,7 @@ extern int (*pci_config_write)(int seg,



+extern void dma32_reserve_bootmem(void);
extern void pci_iommu_alloc(void);

/* The PCI address space does equal the physical memory
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