240 lines
7.1 KiB
C
240 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* hvcserver.c
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* Copyright (C) 2004 Ryan S Arnold, IBM Corporation
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*
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* PPC64 virtual I/O console server support.
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*/
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <asm/hvcall.h>
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#include <asm/hvcserver.h>
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#include <asm/io.h>
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#define HVCS_ARCH_VERSION "1.0.0"
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MODULE_AUTHOR("Ryan S. Arnold <rsa@us.ibm.com>");
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MODULE_DESCRIPTION("IBM hvcs ppc64 API");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(HVCS_ARCH_VERSION);
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/*
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* Convert arch specific return codes into relevant errnos. The hvcs
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* functions aren't performance sensitive, so this conversion isn't an
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* issue.
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*/
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static int hvcs_convert(long to_convert)
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{
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switch (to_convert) {
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case H_SUCCESS:
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return 0;
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case H_PARAMETER:
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return -EINVAL;
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case H_HARDWARE:
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return -EIO;
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case H_BUSY:
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case H_LONG_BUSY_ORDER_1_MSEC:
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case H_LONG_BUSY_ORDER_10_MSEC:
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case H_LONG_BUSY_ORDER_100_MSEC:
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case H_LONG_BUSY_ORDER_1_SEC:
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case H_LONG_BUSY_ORDER_10_SEC:
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case H_LONG_BUSY_ORDER_100_SEC:
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return -EBUSY;
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case H_FUNCTION:
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default:
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return -EPERM;
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}
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}
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/**
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* hvcs_free_partner_info - free pi allocated by hvcs_get_partner_info
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* @head: list_head pointer for an allocated list of partner info structs to
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* free.
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*
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* This function is used to free the partner info list that was returned by
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* calling hvcs_get_partner_info().
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*/
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int hvcs_free_partner_info(struct list_head *head)
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{
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struct hvcs_partner_info *pi;
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struct list_head *element;
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if (!head)
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return -EINVAL;
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while (!list_empty(head)) {
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element = head->next;
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pi = list_entry(element, struct hvcs_partner_info, node);
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list_del(element);
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kfree(pi);
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}
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return 0;
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}
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EXPORT_SYMBOL(hvcs_free_partner_info);
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/* Helper function for hvcs_get_partner_info */
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static int hvcs_next_partner(uint32_t unit_address,
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unsigned long last_p_partition_ID,
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unsigned long last_p_unit_address, unsigned long *pi_buff)
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{
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long retval;
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retval = plpar_hcall_norets(H_VTERM_PARTNER_INFO, unit_address,
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last_p_partition_ID,
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last_p_unit_address, virt_to_phys(pi_buff));
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return hvcs_convert(retval);
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}
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/**
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* hvcs_get_partner_info - Get all of the partner info for a vty-server adapter
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* @unit_address: The unit_address of the vty-server adapter for which this
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* function is fetching partner info.
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* @head: An initialized list_head pointer to an empty list to use to return the
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* list of partner info fetched from the hypervisor to the caller.
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* @pi_buff: A page sized buffer pre-allocated prior to calling this function
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* that is to be used to be used by firmware as an iterator to keep track
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* of the partner info retrieval.
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*
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* This function returns non-zero on success, or if there is no partner info.
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*
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* The pi_buff is pre-allocated prior to calling this function because this
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* function may be called with a spin_lock held and kmalloc of a page is not
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* recommended as GFP_ATOMIC.
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*
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* The first long of this buffer is used to store a partner unit address. The
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* second long is used to store a partner partition ID and starting at
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* pi_buff[2] is the 79 character Converged Location Code (diff size than the
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* unsigned longs, hence the casting mumbo jumbo you see later).
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*
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* Invocation of this function should always be followed by an invocation of
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* hvcs_free_partner_info() using a pointer to the SAME list head instance
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* that was passed as a parameter to this function.
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*/
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int hvcs_get_partner_info(uint32_t unit_address, struct list_head *head,
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unsigned long *pi_buff)
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{
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/*
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* Dealt with as longs because of the hcall interface even though the
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* values are uint32_t.
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*/
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unsigned long last_p_partition_ID;
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unsigned long last_p_unit_address;
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struct hvcs_partner_info *next_partner_info = NULL;
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int more = 1;
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int retval;
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/* invalid parameters */
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if (!head || !pi_buff)
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return -EINVAL;
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memset(pi_buff, 0x00, PAGE_SIZE);
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last_p_partition_ID = last_p_unit_address = ~0UL;
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INIT_LIST_HEAD(head);
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do {
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retval = hvcs_next_partner(unit_address, last_p_partition_ID,
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last_p_unit_address, pi_buff);
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if (retval) {
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/*
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* Don't indicate that we've failed if we have
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* any list elements.
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*/
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if (!list_empty(head))
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return 0;
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return retval;
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}
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last_p_partition_ID = be64_to_cpu(pi_buff[0]);
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last_p_unit_address = be64_to_cpu(pi_buff[1]);
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/* This indicates that there are no further partners */
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if (last_p_partition_ID == ~0UL
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&& last_p_unit_address == ~0UL)
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break;
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/* This is a very small struct and will be freed soon in
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* hvcs_free_partner_info(). */
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next_partner_info = kmalloc(sizeof(struct hvcs_partner_info),
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GFP_ATOMIC);
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if (!next_partner_info) {
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printk(KERN_WARNING "HVCONSOLE: kmalloc() failed to"
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" allocate partner info struct.\n");
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hvcs_free_partner_info(head);
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return -ENOMEM;
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}
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next_partner_info->unit_address
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= (unsigned int)last_p_unit_address;
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next_partner_info->partition_ID
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= (unsigned int)last_p_partition_ID;
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/* copy the Null-term char too */
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strlcpy(&next_partner_info->location_code[0],
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(char *)&pi_buff[2],
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sizeof(next_partner_info->location_code));
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list_add_tail(&(next_partner_info->node), head);
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next_partner_info = NULL;
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} while (more);
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return 0;
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}
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EXPORT_SYMBOL(hvcs_get_partner_info);
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/**
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* hvcs_register_connection - establish a connection between this vty-server and
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* a vty.
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* @unit_address: The unit address of the vty-server adapter that is to be
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* establish a connection.
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* @p_partition_ID: The partition ID of the vty adapter that is to be connected.
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* @p_unit_address: The unit address of the vty adapter to which the vty-server
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* is to be connected.
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*
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* If this function is called once and -EINVAL is returned it may
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* indicate that the partner info needs to be refreshed for the
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* target unit address at which point the caller must invoke
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* hvcs_get_partner_info() and then call this function again. If,
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* for a second time, -EINVAL is returned then it indicates that
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* there is probably already a partner connection registered to a
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* different vty-server adapter. It is also possible that a second
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* -EINVAL may indicate that one of the parms is not valid, for
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* instance if the link was removed between the vty-server adapter
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* and the vty adapter that you are trying to open. Don't shoot the
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* messenger. Firmware implemented it this way.
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*/
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int hvcs_register_connection( uint32_t unit_address,
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uint32_t p_partition_ID, uint32_t p_unit_address)
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{
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long retval;
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retval = plpar_hcall_norets(H_REGISTER_VTERM, unit_address,
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p_partition_ID, p_unit_address);
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return hvcs_convert(retval);
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}
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EXPORT_SYMBOL(hvcs_register_connection);
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/**
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* hvcs_free_connection - free the connection between a vty-server and vty
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* @unit_address: The unit address of the vty-server that is to have its
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* connection severed.
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*
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* This function is used to free the partner connection between a vty-server
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* adapter and a vty adapter.
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*
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* If -EBUSY is returned continue to call this function until 0 is returned.
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*/
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int hvcs_free_connection(uint32_t unit_address)
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{
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long retval;
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retval = plpar_hcall_norets(H_FREE_VTERM, unit_address);
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return hvcs_convert(retval);
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}
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EXPORT_SYMBOL(hvcs_free_connection);
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