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f51bf3073a
This patch adds the equivalent of acpi_fake_nodes() for AMD Northbridge platforms. The goal is to fake the apicid-to-node mappings for NUMA emulation so the physical topology of the machine is correctly maintained within the kernel. This change also fakes proximity domains for both ACPI and k8 code so the physical distance between emulated nodes is maintained via node_distance(). This exports the correct distances via /sys/devices/system/node/.../distance based on the underlying topology. A new helper function, fake_physnodes(), is introduced to correctly invoke the correct NUMA code to fake these two mappings based on the system type. If there is no underlying NUMA configuration, all cpus are mapped to node 0 for local distance. Since acpi_fake_nodes() is no longer called with CONFIG_ACPI_NUMA, it's prototype can be removed from the header file for such a configuration. Signed-off-by: David Rientjes <rientjes@google.com> LKML-Reference: <alpine.DEB.2.00.1012221701360.3701@chino.kir.corp.google.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
#ifndef _ASM_X86_AMD_NB_H
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#define _ASM_X86_AMD_NB_H
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#include <linux/pci.h>
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extern struct pci_device_id amd_nb_misc_ids[];
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struct bootnode;
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extern int early_is_amd_nb(u32 value);
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extern int amd_cache_northbridges(void);
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extern void amd_flush_garts(void);
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extern int amd_numa_init(unsigned long start_pfn, unsigned long end_pfn);
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extern int amd_scan_nodes(void);
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#ifdef CONFIG_NUMA_EMU
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extern void amd_fake_nodes(const struct bootnode *nodes, int nr_nodes);
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extern int amd_get_nodes(struct bootnode *nodes);
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#endif
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struct amd_northbridge {
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struct pci_dev *misc;
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};
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struct amd_northbridge_info {
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u16 num;
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u64 flags;
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struct amd_northbridge *nb;
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};
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extern struct amd_northbridge_info amd_northbridges;
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#define AMD_NB_GART 0x1
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#define AMD_NB_L3_INDEX_DISABLE 0x2
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#ifdef CONFIG_AMD_NB
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static inline int amd_nb_num(void)
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{
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return amd_northbridges.num;
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}
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static inline int amd_nb_has_feature(int feature)
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{
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return ((amd_northbridges.flags & feature) == feature);
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}
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static inline struct amd_northbridge *node_to_amd_nb(int node)
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{
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return (node < amd_northbridges.num) ? &amd_northbridges.nb[node] : NULL;
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}
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#else
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#define amd_nb_num(x) 0
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#define amd_nb_has_feature(x) false
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#define node_to_amd_nb(x) NULL
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#endif
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#endif /* _ASM_X86_AMD_NB_H */
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