152 lines
3.8 KiB
C
152 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#define pr_fmt(fmt) "papr-sysparm: " fmt
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#include <linux/bug.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/printk.h>
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#include <linux/slab.h>
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#include <asm/rtas.h>
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#include <asm/papr-sysparm.h>
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#include <asm/rtas-work-area.h>
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struct papr_sysparm_buf *papr_sysparm_buf_alloc(void)
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{
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struct papr_sysparm_buf *buf = kzalloc(sizeof(*buf), GFP_KERNEL);
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return buf;
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}
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void papr_sysparm_buf_free(struct papr_sysparm_buf *buf)
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{
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kfree(buf);
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}
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/**
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* papr_sysparm_get() - Retrieve the value of a PAPR system parameter.
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* @param: PAPR system parameter token as described in
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* 7.3.16 "System Parameters Option".
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* @buf: A &struct papr_sysparm_buf as returned from papr_sysparm_buf_alloc().
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*
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* Place the result of querying the specified parameter, if available,
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* in @buf. The result includes a be16 length header followed by the
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* value, which may be a string or binary data. See &struct papr_sysparm_buf.
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*
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* Since there is at least one parameter (60, OS Service Entitlement
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* Status) where the results depend on the incoming contents of the
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* work area, the caller-supplied buffer is copied unmodified into the
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* work area before calling ibm,get-system-parameter.
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*
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* A defined parameter may not be implemented on a given system, and
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* some implemented parameters may not be available to all partitions
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* on a system. A parameter's disposition may change at any time due
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* to system configuration changes or partition migration.
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*
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* Context: This function may sleep.
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*
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* Return: 0 on success, -errno otherwise. @buf is unmodified on error.
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*/
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int papr_sysparm_get(papr_sysparm_t param, struct papr_sysparm_buf *buf)
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{
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const s32 token = rtas_function_token(RTAS_FN_IBM_GET_SYSTEM_PARAMETER);
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struct rtas_work_area *work_area;
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s32 fwrc;
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int ret;
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might_sleep();
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if (WARN_ON(!buf))
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return -EFAULT;
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if (token == RTAS_UNKNOWN_SERVICE)
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return -ENOENT;
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work_area = rtas_work_area_alloc(sizeof(*buf));
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memcpy(rtas_work_area_raw_buf(work_area), buf, sizeof(*buf));
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do {
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fwrc = rtas_call(token, 3, 1, NULL, param.token,
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rtas_work_area_phys(work_area),
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rtas_work_area_size(work_area));
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} while (rtas_busy_delay(fwrc));
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switch (fwrc) {
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case 0:
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ret = 0;
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memcpy(buf, rtas_work_area_raw_buf(work_area), sizeof(*buf));
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break;
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case -3: /* parameter not implemented */
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ret = -EOPNOTSUPP;
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break;
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case -9002: /* this partition not authorized to retrieve this parameter */
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ret = -EPERM;
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break;
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case -9999: /* "parameter error" e.g. the buffer is too small */
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ret = -EINVAL;
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break;
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default:
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pr_err("unexpected ibm,get-system-parameter result %d\n", fwrc);
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fallthrough;
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case -1: /* Hardware/platform error */
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ret = -EIO;
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break;
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}
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rtas_work_area_free(work_area);
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return ret;
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}
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int papr_sysparm_set(papr_sysparm_t param, const struct papr_sysparm_buf *buf)
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{
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const s32 token = rtas_function_token(RTAS_FN_IBM_SET_SYSTEM_PARAMETER);
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struct rtas_work_area *work_area;
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s32 fwrc;
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int ret;
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might_sleep();
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if (WARN_ON(!buf))
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return -EFAULT;
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if (token == RTAS_UNKNOWN_SERVICE)
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return -ENOENT;
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work_area = rtas_work_area_alloc(sizeof(*buf));
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memcpy(rtas_work_area_raw_buf(work_area), buf, sizeof(*buf));
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do {
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fwrc = rtas_call(token, 2, 1, NULL, param.token,
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rtas_work_area_phys(work_area));
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} while (rtas_busy_delay(fwrc));
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switch (fwrc) {
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case 0:
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ret = 0;
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break;
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case -3: /* parameter not supported */
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ret = -EOPNOTSUPP;
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break;
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case -9002: /* this partition not authorized to modify this parameter */
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ret = -EPERM;
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break;
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case -9999: /* "parameter error" e.g. invalid input data */
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ret = -EINVAL;
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break;
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default:
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pr_err("unexpected ibm,set-system-parameter result %d\n", fwrc);
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fallthrough;
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case -1: /* Hardware/platform error */
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ret = -EIO;
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break;
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}
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rtas_work_area_free(work_area);
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return ret;
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}
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