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sgi-xp: support runtime selection of xp_max_npartitions
Support runtime selection of the max number of partitions based on the hardware being run on. Signed-off-by: Dean Nelson <dcn@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Dean Nelson
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Linus Torvalds
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Jul 30, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| /* | ||
| * This file is subject to the terms and conditions of the GNU General Public | ||
| * License. See the file "COPYING" in the main directory of this archive | ||
| * for more details. | ||
| * | ||
| * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. | ||
| */ | ||
|
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| /* | ||
| * Cross Partition (XP) sn2-based functions. | ||
| * | ||
| * Architecture specific implementation of common functions. | ||
| */ | ||
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| #include <linux/device.h> | ||
| #include <asm/sn/sn_sal.h> | ||
| #include "xp.h" | ||
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| /* | ||
| * The export of xp_nofault_PIOR needs to happen here since it is defined | ||
| * in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is | ||
| * defined here. | ||
| */ | ||
| EXPORT_SYMBOL_GPL(xp_nofault_PIOR); | ||
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| u64 xp_nofault_PIOR_target; | ||
| EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target); | ||
|
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| /* | ||
| * Register a nofault code region which performs a cross-partition PIO read. | ||
| * If the PIO read times out, the MCA handler will consume the error and | ||
| * return to a kernel-provided instruction to indicate an error. This PIO read | ||
| * exists because it is guaranteed to timeout if the destination is down | ||
| * (AMO operations do not timeout on at least some CPUs on Shubs <= v1.2, | ||
| * which unfortunately we have to work around). | ||
| */ | ||
| static enum xp_retval | ||
| xp_register_nofault_code_sn2(void) | ||
| { | ||
| int ret; | ||
| u64 func_addr; | ||
| u64 err_func_addr; | ||
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| func_addr = *(u64 *)xp_nofault_PIOR; | ||
| err_func_addr = *(u64 *)xp_error_PIOR; | ||
| ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr, | ||
| 1, 1); | ||
| if (ret != 0) { | ||
| dev_err(xp, "can't register nofault code, error=%d\n", ret); | ||
| return xpSalError; | ||
| } | ||
| /* | ||
| * Setup the nofault PIO read target. (There is no special reason why | ||
| * SH_IPI_ACCESS was selected.) | ||
| */ | ||
| if (is_shub1()) | ||
| xp_nofault_PIOR_target = SH1_IPI_ACCESS; | ||
| else if (is_shub2()) | ||
| xp_nofault_PIOR_target = SH2_IPI_ACCESS0; | ||
|
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| return xpSuccess; | ||
| } | ||
|
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| void | ||
| xp_unregister_nofault_code_sn2(void) | ||
| { | ||
| u64 func_addr = *(u64 *)xp_nofault_PIOR; | ||
| u64 err_func_addr = *(u64 *)xp_error_PIOR; | ||
|
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| /* unregister the PIO read nofault code region */ | ||
| (void)sn_register_nofault_code(func_addr, err_func_addr, | ||
| err_func_addr, 1, 0); | ||
| } | ||
|
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| enum xp_retval | ||
| xp_init_sn2(void) | ||
| { | ||
| BUG_ON(!is_shub()); | ||
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| xp_max_npartitions = XP_MAX_NPARTITIONS_SN2; | ||
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| return xp_register_nofault_code_sn2(); | ||
| } | ||
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| void | ||
| xp_exit_sn2(void) | ||
| { | ||
| BUG_ON(!is_shub()); | ||
|
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| xp_unregister_nofault_code_sn2(); | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| * This file is subject to the terms and conditions of the GNU General Public | ||
| * License. See the file "COPYING" in the main directory of this archive | ||
| * for more details. | ||
| * | ||
| * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. | ||
| */ | ||
|
|
||
| /* | ||
| * Cross Partition (XP) uv-based functions. | ||
| * | ||
| * Architecture specific implementation of common functions. | ||
| * | ||
| */ | ||
|
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| #include "xp.h" | ||
|
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| enum xp_retval | ||
| xp_init_uv(void) | ||
| { | ||
| BUG_ON(!is_uv()); | ||
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| xp_max_npartitions = XP_MAX_NPARTITIONS_UV; | ||
| } | ||
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| void | ||
| xp_exit_uv(void) | ||
| { | ||
| BUG_ON(!is_uv()); | ||
| } |
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