f7618299b4
This patch extends pstore, a generic interface to platform dependent persistent storage, support for powernv platform to capture certain useful information, during dying moments. Such support is already in place for pseries platform. This patch re-uses most of that code. It is a common practice to compile kernels with both CONFIG_PPC_PSERIES=y and CONFIG_PPC_POWERNV=y. The code in nvram_init_oops_partition() routine still works as intended, as the caller is platform specific code which passes the appropriate value for "rtas_partition_exists" parameter. In all other places, where CONFIG_PPC_PSERIES or CONFIG_PPC_POWERNV flag is used in this patchset, it is to reduce the kernel size in cases where this flag is not set and doesn't have any impact logic wise. Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
99 lines
2 KiB
C
99 lines
2 KiB
C
/*
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* PowerNV nvram code.
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*
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* Copyright 2011 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define DEBUG
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <asm/opal.h>
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#include <asm/nvram.h>
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#include <asm/machdep.h>
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static unsigned int nvram_size;
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static ssize_t opal_nvram_size(void)
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{
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return nvram_size;
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}
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static ssize_t opal_nvram_read(char *buf, size_t count, loff_t *index)
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{
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s64 rc;
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int off;
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if (*index >= nvram_size)
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return 0;
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off = *index;
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if ((off + count) > nvram_size)
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count = nvram_size - off;
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rc = opal_read_nvram(__pa(buf), count, off);
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if (rc != OPAL_SUCCESS)
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return -EIO;
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*index += count;
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return count;
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}
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static ssize_t opal_nvram_write(char *buf, size_t count, loff_t *index)
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{
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s64 rc = OPAL_BUSY;
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int off;
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if (*index >= nvram_size)
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return 0;
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off = *index;
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if ((off + count) > nvram_size)
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count = nvram_size - off;
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while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
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rc = opal_write_nvram(__pa(buf), count, off);
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if (rc == OPAL_BUSY_EVENT)
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opal_poll_events(NULL);
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}
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*index += count;
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return count;
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}
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static int __init opal_nvram_init_log_partitions(void)
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{
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/* Scan nvram for partitions */
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nvram_scan_partitions();
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nvram_init_oops_partition(0);
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return 0;
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}
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machine_arch_initcall(powernv, opal_nvram_init_log_partitions);
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void __init opal_nvram_init(void)
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{
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struct device_node *np;
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const __be32 *nbytes_p;
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np = of_find_compatible_node(NULL, NULL, "ibm,opal-nvram");
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if (np == NULL)
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return;
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nbytes_p = of_get_property(np, "#bytes", NULL);
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if (!nbytes_p) {
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of_node_put(np);
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return;
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}
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nvram_size = be32_to_cpup(nbytes_p);
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pr_info("OPAL nvram setup, %u bytes\n", nvram_size);
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of_node_put(np);
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ppc_md.nvram_read = opal_nvram_read;
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ppc_md.nvram_write = opal_nvram_write;
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ppc_md.nvram_size = opal_nvram_size;
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}
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