cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/pseries/hvcserver.c

/*
 * hvcserver.c
 * Copyright (C) 2004 Ryan S Arnold, IBM Corporation
 *
 * PPC64 virtual I/O console server support.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>

#include <asm/hvcall.h>
#include <asm/hvcserver.h>
#include <asm/io.h>


#define HVCS_ARCH_VERSION "1.0.0"

MODULE_AUTHOR("Ryan S. Arnold <rsa@us.ibm.com>");
MODULE_DESCRIPTION("IBM hvcs ppc64 API");
MODULE_LICENSE("GPL");

MODULE_VERSION(HVCS_ARCH_VERSION);

/*
 * Convert arch specific return codes into relevant errnos.  The hvcs
 * functions aren't performance sensitive, so this conversion isn't an
 * issue.
 */

static int hvcs_convert(long to_convert) { switch (to_convert) { case H_SUCCESS: return 0; case H_PARAMETER: return -EINVAL; case H_HARDWARE: return -EIO; case H_BUSY: case H_LONG_BUSY_ORDER_1_MSEC: case H_LONG_BUSY_ORDER_10_MSEC: case H_LONG_BUSY_ORDER_100_MSEC: case H_LONG_BUSY_ORDER_1_SEC: case H_LONG_BUSY_ORDER_10_SEC: case H_LONG_BUSY_ORDER_100_SEC: return -EBUSY; case H_FUNCTION: /* fall through */ default: return -EPERM; } }

Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold5782.61%133.33%
Segher Boessenkool1115.94%133.33%
Arnd Bergmann11.45%133.33%
Total69100.00%3100.00%

/** * hvcs_free_partner_info - free pi allocated by hvcs_get_partner_info * @head: list_head pointer for an allocated list of partner info structs to * free. * * This function is used to free the partner info list that was returned by * calling hvcs_get_partner_info(). */
int hvcs_free_partner_info(struct list_head *head) { struct hvcs_partner_info *pi; struct list_head *element; if (!head) return -EINVAL; while (!list_empty(head)) { element = head->next; pi = list_entry(element, struct hvcs_partner_info, node); list_del(element); kfree(pi); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold70100.00%1100.00%
Total70100.00%1100.00%

EXPORT_SYMBOL(hvcs_free_partner_info); /* Helper function for hvcs_get_partner_info */
static int hvcs_next_partner(uint32_t unit_address, unsigned long last_p_partition_ID, unsigned long last_p_unit_address, unsigned long *pi_buff) { long retval; retval = plpar_hcall_norets(H_VTERM_PARTNER_INFO, unit_address, last_p_partition_ID, last_p_unit_address, virt_to_phys(pi_buff)); return hvcs_convert(retval); }

Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold4897.96%266.67%
Arnd Bergmann12.04%133.33%
Total49100.00%3100.00%

/** * hvcs_get_partner_info - Get all of the partner info for a vty-server adapter * @unit_address: The unit_address of the vty-server adapter for which this * function is fetching partner info. * @head: An initialized list_head pointer to an empty list to use to return the * list of partner info fetched from the hypervisor to the caller. * @pi_buff: A page sized buffer pre-allocated prior to calling this function * that is to be used to be used by firmware as an iterator to keep track * of the partner info retrieval. * * This function returns non-zero on success, or if there is no partner info. * * The pi_buff is pre-allocated prior to calling this function because this * function may be called with a spin_lock held and kmalloc of a page is not * recommended as GFP_ATOMIC. * * The first long of this buffer is used to store a partner unit address. The * second long is used to store a partner partition ID and starting at * pi_buff[2] is the 79 character Converged Location Code (diff size than the * unsigned longs, hence the casting mumbo jumbo you see later). * * Invocation of this function should always be followed by an invocation of * hvcs_free_partner_info() using a pointer to the SAME list head instance * that was passed as a parameter to this function. */
int hvcs_get_partner_info(uint32_t unit_address, struct list_head *head, unsigned long *pi_buff) { /* * Dealt with as longs because of the hcall interface even though the * values are uint32_t. */ unsigned long last_p_partition_ID; unsigned long last_p_unit_address; struct hvcs_partner_info *next_partner_info = NULL; int more = 1; int retval; /* invalid parameters */ if (!head || !pi_buff) return -EINVAL; memset(pi_buff, 0x00, PAGE_SIZE); last_p_partition_ID = last_p_unit_address = ~0UL; INIT_LIST_HEAD(head); do { retval = hvcs_next_partner(unit_address, last_p_partition_ID, last_p_unit_address, pi_buff); if (retval) { /* * Don't indicate that we've failed if we have * any list elements. */ if (!list_empty(head)) return 0; return retval; } last_p_partition_ID = be64_to_cpu(pi_buff[0]); last_p_unit_address = be64_to_cpu(pi_buff[1]); /* This indicates that there are no further partners */ if (last_p_partition_ID == ~0UL && last_p_unit_address == ~0UL) break; /* This is a very small struct and will be freed soon in * hvcs_free_partner_info(). */ next_partner_info = kmalloc(sizeof(struct hvcs_partner_info), GFP_ATOMIC); if (!next_partner_info) { printk(KERN_WARNING "HVCONSOLE: kmalloc() failed to" " allocate partner info struct.\n"); hvcs_free_partner_info(head); return -ENOMEM; } next_partner_info->unit_address = (unsigned int)last_p_unit_address; next_partner_info->partition_ID = (unsigned int)last_p_partition_ID; /* copy the Null-term char too */ strlcpy(&next_partner_info->location_code[0], (char *)&pi_buff[2], sizeof(next_partner_info->location_code)); list_add_tail(&(next_partner_info->node), head); next_partner_info = NULL; } while (more); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold23792.22%240.00%
Colin Ian King93.50%120.00%
Thomas Falcon62.33%120.00%
Chen Gang S51.95%120.00%
Total257100.00%5100.00%

EXPORT_SYMBOL(hvcs_get_partner_info); /** * hvcs_register_connection - establish a connection between this vty-server and * a vty. * @unit_address: The unit address of the vty-server adapter that is to be * establish a connection. * @p_partition_ID: The partition ID of the vty adapter that is to be connected. * @p_unit_address: The unit address of the vty adapter to which the vty-server * is to be connected. * * If this function is called once and -EINVAL is returned it may * indicate that the partner info needs to be refreshed for the * target unit address at which point the caller must invoke * hvcs_get_partner_info() and then call this function again. If, * for a second time, -EINVAL is returned then it indicates that * there is probably already a partner connection registered to a * different vty-server adapter. It is also possible that a second * -EINVAL may indicate that one of the parms is not valid, for * instance if the link was removed between the vty-server adapter * and the vty adapter that you are trying to open. Don't shoot the * messenger. Firmware implemented it this way. */
int hvcs_register_connection( uint32_t unit_address, uint32_t p_partition_ID, uint32_t p_unit_address) { long retval; retval = plpar_hcall_norets(H_REGISTER_VTERM, unit_address, p_partition_ID, p_unit_address); return hvcs_convert(retval); }

Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold36100.00%2100.00%
Total36100.00%2100.00%

EXPORT_SYMBOL(hvcs_register_connection); /** * hvcs_free_connection - free the connection between a vty-server and vty * @unit_address: The unit address of the vty-server that is to have its * connection severed. * * This function is used to free the partner connection between a vty-server * adapter and a vty adapter. * * If -EBUSY is returned continue to call this function until 0 is returned. */
int hvcs_free_connection(uint32_t unit_address) { long retval; retval = plpar_hcall_norets(H_FREE_VTERM, unit_address); return hvcs_convert(retval); }

Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold26100.00%2100.00%
Total26100.00%2100.00%

EXPORT_SYMBOL(hvcs_free_connection);

Overall Contributors

PersonTokensPropCommitsCommitProp
Ryan S. Arnold54393.30%225.00%
Segher Boessenkool111.89%112.50%
Colin Ian King91.55%112.50%
Chen Gang S81.37%112.50%
Thomas Falcon61.03%112.50%
Tim Schmielau30.52%112.50%
Arnd Bergmann20.34%112.50%
Total582100.00%8100.00%
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