2015-05-07 17:49:19 +00:00
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/*
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* Driver for IBM PowerNV 842 compression accelerator
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*
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* Copyright (C) 2015 Dan Streetman, IBM Corp
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include "nx-842.h"
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#include <linux/timer.h>
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#include <asm/prom.h>
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#include <asm/icswx.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>");
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MODULE_DESCRIPTION("842 H/W Compression driver for IBM PowerNV processors");
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#define WORKMEM_ALIGN (CRB_ALIGN)
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#define CSB_WAIT_MAX (5000) /* ms */
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struct nx842_workmem {
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/* Below fields must be properly aligned */
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struct coprocessor_request_block crb; /* CRB_ALIGN align */
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struct data_descriptor_entry ddl_in[DDL_LEN_MAX]; /* DDE_ALIGN align */
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struct data_descriptor_entry ddl_out[DDL_LEN_MAX]; /* DDE_ALIGN align */
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/* Above fields must be properly aligned */
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ktime_t start;
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char padding[WORKMEM_ALIGN]; /* unused, to allow alignment */
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} __packed __aligned(WORKMEM_ALIGN);
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struct nx842_coproc {
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unsigned int chip_id;
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unsigned int ct;
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unsigned int ci;
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struct list_head list;
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};
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/* no cpu hotplug on powernv, so this list never changes after init */
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static LIST_HEAD(nx842_coprocs);
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static unsigned int nx842_ct;
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/**
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* setup_indirect_dde - Setup an indirect DDE
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*
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* The DDE is setup with the the DDE count, byte count, and address of
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* first direct DDE in the list.
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*/
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static void setup_indirect_dde(struct data_descriptor_entry *dde,
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struct data_descriptor_entry *ddl,
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unsigned int dde_count, unsigned int byte_count)
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{
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dde->flags = 0;
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dde->count = dde_count;
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dde->index = 0;
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dde->length = cpu_to_be32(byte_count);
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dde->address = cpu_to_be64(nx842_get_pa(ddl));
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}
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/**
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* setup_direct_dde - Setup single DDE from buffer
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*
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* The DDE is setup with the buffer and length. The buffer must be properly
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* aligned. The used length is returned.
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* Returns:
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* N Successfully set up DDE with N bytes
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*/
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static unsigned int setup_direct_dde(struct data_descriptor_entry *dde,
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unsigned long pa, unsigned int len)
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{
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unsigned int l = min_t(unsigned int, len, LEN_ON_PAGE(pa));
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dde->flags = 0;
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dde->count = 0;
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dde->index = 0;
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dde->length = cpu_to_be32(l);
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dde->address = cpu_to_be64(pa);
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return l;
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}
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/**
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* setup_ddl - Setup DDL from buffer
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*
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* Returns:
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* 0 Successfully set up DDL
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*/
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static int setup_ddl(struct data_descriptor_entry *dde,
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struct data_descriptor_entry *ddl,
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unsigned char *buf, unsigned int len,
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bool in)
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{
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unsigned long pa = nx842_get_pa(buf);
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int i, ret, total_len = len;
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if (!IS_ALIGNED(pa, DDE_BUFFER_ALIGN)) {
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pr_debug("%s buffer pa 0x%lx not 0x%x-byte aligned\n",
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in ? "input" : "output", pa, DDE_BUFFER_ALIGN);
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return -EINVAL;
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}
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/* only need to check last mult; since buffer must be
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* DDE_BUFFER_ALIGN aligned, and that is a multiple of
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* DDE_BUFFER_SIZE_MULT, and pre-last page DDE buffers
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* are guaranteed a multiple of DDE_BUFFER_SIZE_MULT.
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*/
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if (len % DDE_BUFFER_LAST_MULT) {
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pr_debug("%s buffer len 0x%x not a multiple of 0x%x\n",
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in ? "input" : "output", len, DDE_BUFFER_LAST_MULT);
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if (in)
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return -EINVAL;
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len = round_down(len, DDE_BUFFER_LAST_MULT);
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}
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/* use a single direct DDE */
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if (len <= LEN_ON_PAGE(pa)) {
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ret = setup_direct_dde(dde, pa, len);
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WARN_ON(ret < len);
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return 0;
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}
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/* use the DDL */
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for (i = 0; i < DDL_LEN_MAX && len > 0; i++) {
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ret = setup_direct_dde(&ddl[i], pa, len);
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buf += ret;
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len -= ret;
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pa = nx842_get_pa(buf);
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}
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if (len > 0) {
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pr_debug("0x%x total %s bytes 0x%x too many for DDL.\n",
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total_len, in ? "input" : "output", len);
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if (in)
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return -EMSGSIZE;
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total_len -= len;
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}
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setup_indirect_dde(dde, ddl, i, total_len);
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return 0;
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}
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#define CSB_ERR(csb, msg, ...) \
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pr_err("ERROR: " msg " : %02x %02x %02x %02x %08x\n", \
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##__VA_ARGS__, (csb)->flags, \
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(csb)->cs, (csb)->cc, (csb)->ce, \
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be32_to_cpu((csb)->count))
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#define CSB_ERR_ADDR(csb, msg, ...) \
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CSB_ERR(csb, msg " at %lx", ##__VA_ARGS__, \
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(unsigned long)be64_to_cpu((csb)->address))
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/**
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* wait_for_csb
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*/
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static int wait_for_csb(struct nx842_workmem *wmem,
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struct coprocessor_status_block *csb)
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{
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ktime_t start = wmem->start, now = ktime_get();
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ktime_t timeout = ktime_add_ms(start, CSB_WAIT_MAX);
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while (!(ACCESS_ONCE(csb->flags) & CSB_V)) {
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cpu_relax();
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now = ktime_get();
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if (ktime_after(now, timeout))
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break;
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}
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/* hw has updated csb and output buffer */
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barrier();
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/* check CSB flags */
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if (!(csb->flags & CSB_V)) {
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CSB_ERR(csb, "CSB still not valid after %ld us, giving up",
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(long)ktime_us_delta(now, start));
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return -ETIMEDOUT;
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}
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if (csb->flags & CSB_F) {
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CSB_ERR(csb, "Invalid CSB format");
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return -EPROTO;
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}
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if (csb->flags & CSB_CH) {
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CSB_ERR(csb, "Invalid CSB chaining state");
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return -EPROTO;
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}
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/* verify CSB completion sequence is 0 */
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if (csb->cs) {
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CSB_ERR(csb, "Invalid CSB completion sequence");
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return -EPROTO;
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}
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/* check CSB Completion Code */
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switch (csb->cc) {
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/* no error */
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case CSB_CC_SUCCESS:
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break;
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case CSB_CC_TPBC_GT_SPBC:
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/* not an error, but the compressed data is
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* larger than the uncompressed data :(
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*/
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break;
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/* input data errors */
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case CSB_CC_OPERAND_OVERLAP:
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/* input and output buffers overlap */
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CSB_ERR(csb, "Operand Overlap error");
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return -EINVAL;
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case CSB_CC_INVALID_OPERAND:
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CSB_ERR(csb, "Invalid operand");
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return -EINVAL;
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case CSB_CC_NOSPC:
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/* output buffer too small */
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return -ENOSPC;
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case CSB_CC_ABORT:
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CSB_ERR(csb, "Function aborted");
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return -EINTR;
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case CSB_CC_CRC_MISMATCH:
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CSB_ERR(csb, "CRC mismatch");
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return -EINVAL;
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case CSB_CC_TEMPL_INVALID:
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CSB_ERR(csb, "Compressed data template invalid");
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return -EINVAL;
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case CSB_CC_TEMPL_OVERFLOW:
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CSB_ERR(csb, "Compressed data template shows data past end");
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return -EINVAL;
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/* these should not happen */
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case CSB_CC_INVALID_ALIGN:
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/* setup_ddl should have detected this */
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CSB_ERR_ADDR(csb, "Invalid alignment");
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return -EINVAL;
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case CSB_CC_DATA_LENGTH:
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/* setup_ddl should have detected this */
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CSB_ERR(csb, "Invalid data length");
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return -EINVAL;
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case CSB_CC_WR_TRANSLATION:
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case CSB_CC_TRANSLATION:
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case CSB_CC_TRANSLATION_DUP1:
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case CSB_CC_TRANSLATION_DUP2:
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case CSB_CC_TRANSLATION_DUP3:
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case CSB_CC_TRANSLATION_DUP4:
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case CSB_CC_TRANSLATION_DUP5:
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case CSB_CC_TRANSLATION_DUP6:
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/* should not happen, we use physical addrs */
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CSB_ERR_ADDR(csb, "Translation error");
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return -EPROTO;
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case CSB_CC_WR_PROTECTION:
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case CSB_CC_PROTECTION:
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case CSB_CC_PROTECTION_DUP1:
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case CSB_CC_PROTECTION_DUP2:
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case CSB_CC_PROTECTION_DUP3:
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case CSB_CC_PROTECTION_DUP4:
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case CSB_CC_PROTECTION_DUP5:
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case CSB_CC_PROTECTION_DUP6:
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/* should not happen, we use physical addrs */
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CSB_ERR_ADDR(csb, "Protection error");
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return -EPROTO;
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case CSB_CC_PRIVILEGE:
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/* shouldn't happen, we're in HYP mode */
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CSB_ERR(csb, "Insufficient Privilege error");
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return -EPROTO;
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case CSB_CC_EXCESSIVE_DDE:
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/* shouldn't happen, setup_ddl doesn't use many dde's */
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CSB_ERR(csb, "Too many DDEs in DDL");
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return -EINVAL;
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case CSB_CC_TRANSPORT:
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/* shouldn't happen, we setup CRB correctly */
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CSB_ERR(csb, "Invalid CRB");
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return -EINVAL;
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case CSB_CC_SEGMENTED_DDL:
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/* shouldn't happen, setup_ddl creates DDL right */
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CSB_ERR(csb, "Segmented DDL error");
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return -EINVAL;
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case CSB_CC_DDE_OVERFLOW:
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/* shouldn't happen, setup_ddl creates DDL right */
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CSB_ERR(csb, "DDE overflow error");
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return -EINVAL;
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case CSB_CC_SESSION:
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/* should not happen with ICSWX */
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CSB_ERR(csb, "Session violation error");
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return -EPROTO;
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case CSB_CC_CHAIN:
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/* should not happen, we don't use chained CRBs */
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CSB_ERR(csb, "Chained CRB error");
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return -EPROTO;
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case CSB_CC_SEQUENCE:
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/* should not happen, we don't use chained CRBs */
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CSB_ERR(csb, "CRB seqeunce number error");
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return -EPROTO;
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case CSB_CC_UNKNOWN_CODE:
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CSB_ERR(csb, "Unknown subfunction code");
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return -EPROTO;
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/* hardware errors */
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case CSB_CC_RD_EXTERNAL:
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case CSB_CC_RD_EXTERNAL_DUP1:
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case CSB_CC_RD_EXTERNAL_DUP2:
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case CSB_CC_RD_EXTERNAL_DUP3:
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CSB_ERR_ADDR(csb, "Read error outside coprocessor");
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return -EPROTO;
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case CSB_CC_WR_EXTERNAL:
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CSB_ERR_ADDR(csb, "Write error outside coprocessor");
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return -EPROTO;
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case CSB_CC_INTERNAL:
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CSB_ERR(csb, "Internal error in coprocessor");
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return -EPROTO;
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case CSB_CC_PROVISION:
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CSB_ERR(csb, "Storage provision error");
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return -EPROTO;
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case CSB_CC_HW:
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CSB_ERR(csb, "Correctable hardware error");
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return -EPROTO;
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default:
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CSB_ERR(csb, "Invalid CC %d", csb->cc);
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return -EPROTO;
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}
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/* check Completion Extension state */
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if (csb->ce & CSB_CE_TERMINATION) {
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CSB_ERR(csb, "CSB request was terminated");
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return -EPROTO;
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}
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if (csb->ce & CSB_CE_INCOMPLETE) {
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CSB_ERR(csb, "CSB request not complete");
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return -EPROTO;
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}
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if (!(csb->ce & CSB_CE_TPBC)) {
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CSB_ERR(csb, "TPBC not provided, unknown target length");
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return -EPROTO;
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}
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/* successful completion */
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pr_debug_ratelimited("Processed %u bytes in %lu us\n", csb->count,
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(unsigned long)ktime_us_delta(now, start));
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return 0;
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}
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/**
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* nx842_powernv_function - compress/decompress data using the 842 algorithm
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*
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* (De)compression provided by the NX842 coprocessor on IBM PowerNV systems.
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* This compresses or decompresses the provided input buffer into the provided
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* output buffer.
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*
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|
* Upon return from this function @outlen contains the length of the
|
|
|
|
* output data. If there is an error then @outlen will be 0 and an
|
|
|
|
* error will be specified by the return code from this function.
|
|
|
|
*
|
|
|
|
* The @workmem buffer should only be used by one function call at a time.
|
|
|
|
*
|
|
|
|
* @in: input buffer pointer
|
|
|
|
* @inlen: input buffer size
|
|
|
|
* @out: output buffer pointer
|
|
|
|
* @outlenp: output buffer size pointer
|
|
|
|
* @workmem: working memory buffer pointer, must be at least NX842_MEM_COMPRESS
|
|
|
|
* @fc: function code, see CCW Function Codes in nx-842.h
|
|
|
|
*
|
|
|
|
* Returns:
|
|
|
|
* 0 Success, output of length @outlenp stored in the buffer at @out
|
|
|
|
* -ENODEV Hardware unavailable
|
|
|
|
* -ENOSPC Output buffer is to small
|
|
|
|
* -EMSGSIZE Input buffer too large
|
|
|
|
* -EINVAL buffer constraints do not fix nx842_constraints
|
|
|
|
* -EPROTO hardware error during operation
|
|
|
|
* -ETIMEDOUT hardware did not complete operation in reasonable time
|
|
|
|
* -EINTR operation was aborted
|
|
|
|
*/
|
|
|
|
static int nx842_powernv_function(const unsigned char *in, unsigned int inlen,
|
|
|
|
unsigned char *out, unsigned int *outlenp,
|
|
|
|
void *workmem, int fc)
|
|
|
|
{
|
|
|
|
struct coprocessor_request_block *crb;
|
|
|
|
struct coprocessor_status_block *csb;
|
|
|
|
struct nx842_workmem *wmem;
|
|
|
|
int ret;
|
|
|
|
u64 csb_addr;
|
|
|
|
u32 ccw;
|
|
|
|
unsigned int outlen = *outlenp;
|
|
|
|
|
|
|
|
wmem = PTR_ALIGN(workmem, WORKMEM_ALIGN);
|
|
|
|
|
|
|
|
*outlenp = 0;
|
|
|
|
|
|
|
|
/* shoudn't happen, we don't load without a coproc */
|
|
|
|
if (!nx842_ct) {
|
|
|
|
pr_err_ratelimited("coprocessor CT is 0");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
crb = &wmem->crb;
|
|
|
|
csb = &crb->csb;
|
|
|
|
|
|
|
|
/* Clear any previous values */
|
|
|
|
memset(crb, 0, sizeof(*crb));
|
|
|
|
|
|
|
|
/* set up DDLs */
|
|
|
|
ret = setup_ddl(&crb->source, wmem->ddl_in,
|
|
|
|
(unsigned char *)in, inlen, true);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
ret = setup_ddl(&crb->target, wmem->ddl_out,
|
|
|
|
out, outlen, false);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
/* set up CCW */
|
|
|
|
ccw = 0;
|
|
|
|
ccw = SET_FIELD(ccw, CCW_CT, nx842_ct);
|
|
|
|
ccw = SET_FIELD(ccw, CCW_CI_842, 0); /* use 0 for hw auto-selection */
|
|
|
|
ccw = SET_FIELD(ccw, CCW_FC_842, fc);
|
|
|
|
|
|
|
|
/* set up CRB's CSB addr */
|
|
|
|
csb_addr = nx842_get_pa(csb) & CRB_CSB_ADDRESS;
|
|
|
|
csb_addr |= CRB_CSB_AT; /* Addrs are phys */
|
|
|
|
crb->csb_addr = cpu_to_be64(csb_addr);
|
|
|
|
|
|
|
|
wmem->start = ktime_get();
|
|
|
|
|
|
|
|
/* do ICSWX */
|
|
|
|
ret = icswx(cpu_to_be32(ccw), crb);
|
|
|
|
|
|
|
|
pr_debug_ratelimited("icswx CR %x ccw %x crb->ccw %x\n", ret,
|
|
|
|
(unsigned int)ccw,
|
|
|
|
(unsigned int)be32_to_cpu(crb->ccw));
|
|
|
|
|
|
|
|
switch (ret) {
|
|
|
|
case ICSWX_INITIATED:
|
|
|
|
ret = wait_for_csb(wmem, csb);
|
|
|
|
break;
|
|
|
|
case ICSWX_BUSY:
|
|
|
|
pr_debug_ratelimited("842 Coprocessor busy\n");
|
|
|
|
ret = -EBUSY;
|
|
|
|
break;
|
|
|
|
case ICSWX_REJECTED:
|
|
|
|
pr_err_ratelimited("ICSWX rejected\n");
|
|
|
|
ret = -EPROTO;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
pr_err_ratelimited("Invalid ICSWX return code %x\n", ret);
|
|
|
|
ret = -EPROTO;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!ret)
|
|
|
|
*outlenp = be32_to_cpu(csb->count);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* nx842_powernv_compress - Compress data using the 842 algorithm
|
|
|
|
*
|
|
|
|
* Compression provided by the NX842 coprocessor on IBM PowerNV systems.
|
|
|
|
* The input buffer is compressed and the result is stored in the
|
|
|
|
* provided output buffer.
|
|
|
|
*
|
|
|
|
* Upon return from this function @outlen contains the length of the
|
|
|
|
* compressed data. If there is an error then @outlen will be 0 and an
|
|
|
|
* error will be specified by the return code from this function.
|
|
|
|
*
|
|
|
|
* @in: input buffer pointer
|
|
|
|
* @inlen: input buffer size
|
|
|
|
* @out: output buffer pointer
|
|
|
|
* @outlenp: output buffer size pointer
|
|
|
|
* @workmem: working memory buffer pointer, must be at least NX842_MEM_COMPRESS
|
|
|
|
*
|
|
|
|
* Returns: see @nx842_powernv_function()
|
|
|
|
*/
|
|
|
|
static int nx842_powernv_compress(const unsigned char *in, unsigned int inlen,
|
|
|
|
unsigned char *out, unsigned int *outlenp,
|
|
|
|
void *wmem)
|
|
|
|
{
|
|
|
|
return nx842_powernv_function(in, inlen, out, outlenp,
|
|
|
|
wmem, CCW_FC_842_COMP_NOCRC);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* nx842_powernv_decompress - Decompress data using the 842 algorithm
|
|
|
|
*
|
|
|
|
* Decompression provided by the NX842 coprocessor on IBM PowerNV systems.
|
|
|
|
* The input buffer is decompressed and the result is stored in the
|
|
|
|
* provided output buffer.
|
|
|
|
*
|
|
|
|
* Upon return from this function @outlen contains the length of the
|
|
|
|
* decompressed data. If there is an error then @outlen will be 0 and an
|
|
|
|
* error will be specified by the return code from this function.
|
|
|
|
*
|
|
|
|
* @in: input buffer pointer
|
|
|
|
* @inlen: input buffer size
|
|
|
|
* @out: output buffer pointer
|
|
|
|
* @outlenp: output buffer size pointer
|
|
|
|
* @workmem: working memory buffer pointer, must be at least NX842_MEM_COMPRESS
|
|
|
|
*
|
|
|
|
* Returns: see @nx842_powernv_function()
|
|
|
|
*/
|
|
|
|
static int nx842_powernv_decompress(const unsigned char *in, unsigned int inlen,
|
|
|
|
unsigned char *out, unsigned int *outlenp,
|
|
|
|
void *wmem)
|
|
|
|
{
|
|
|
|
return nx842_powernv_function(in, inlen, out, outlenp,
|
|
|
|
wmem, CCW_FC_842_DECOMP_NOCRC);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init nx842_powernv_probe(struct device_node *dn)
|
|
|
|
{
|
|
|
|
struct nx842_coproc *coproc;
|
|
|
|
struct property *ct_prop, *ci_prop;
|
|
|
|
unsigned int ct, ci;
|
|
|
|
int chip_id;
|
|
|
|
|
|
|
|
chip_id = of_get_ibm_chip_id(dn);
|
|
|
|
if (chip_id < 0) {
|
|
|
|
pr_err("ibm,chip-id missing\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
ct_prop = of_find_property(dn, "ibm,842-coprocessor-type", NULL);
|
|
|
|
if (!ct_prop) {
|
|
|
|
pr_err("ibm,842-coprocessor-type missing\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
ct = be32_to_cpu(*(unsigned int *)ct_prop->value);
|
|
|
|
ci_prop = of_find_property(dn, "ibm,842-coprocessor-instance", NULL);
|
|
|
|
if (!ci_prop) {
|
|
|
|
pr_err("ibm,842-coprocessor-instance missing\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
ci = be32_to_cpu(*(unsigned int *)ci_prop->value);
|
|
|
|
|
|
|
|
coproc = kmalloc(sizeof(*coproc), GFP_KERNEL);
|
|
|
|
if (!coproc)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
coproc->chip_id = chip_id;
|
|
|
|
coproc->ct = ct;
|
|
|
|
coproc->ci = ci;
|
|
|
|
INIT_LIST_HEAD(&coproc->list);
|
|
|
|
list_add(&coproc->list, &nx842_coprocs);
|
|
|
|
|
|
|
|
pr_info("coprocessor found on chip %d, CT %d CI %d\n", chip_id, ct, ci);
|
|
|
|
|
|
|
|
if (!nx842_ct)
|
|
|
|
nx842_ct = ct;
|
|
|
|
else if (nx842_ct != ct)
|
|
|
|
pr_err("NX842 chip %d, CT %d != first found CT %d\n",
|
|
|
|
chip_id, ct, nx842_ct);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nx842_constraints nx842_powernv_constraints = {
|
|
|
|
.alignment = DDE_BUFFER_ALIGN,
|
|
|
|
.multiple = DDE_BUFFER_LAST_MULT,
|
|
|
|
.minimum = DDE_BUFFER_LAST_MULT,
|
|
|
|
.maximum = (DDL_LEN_MAX - 1) * PAGE_SIZE,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct nx842_driver nx842_powernv_driver = {
|
2015-05-28 20:21:31 +00:00
|
|
|
.name = KBUILD_MODNAME,
|
2015-05-07 17:49:19 +00:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.constraints = &nx842_powernv_constraints,
|
|
|
|
.compress = nx842_powernv_compress,
|
|
|
|
.decompress = nx842_powernv_decompress,
|
|
|
|
};
|
|
|
|
|
|
|
|
static __init int nx842_powernv_init(void)
|
|
|
|
{
|
|
|
|
struct device_node *dn;
|
|
|
|
|
|
|
|
/* verify workmem size/align restrictions */
|
|
|
|
BUILD_BUG_ON(sizeof(struct nx842_workmem) > NX842_MEM_COMPRESS);
|
|
|
|
BUILD_BUG_ON(WORKMEM_ALIGN % CRB_ALIGN);
|
|
|
|
BUILD_BUG_ON(CRB_ALIGN % DDE_ALIGN);
|
|
|
|
BUILD_BUG_ON(CRB_SIZE % DDE_ALIGN);
|
|
|
|
/* verify buffer size/align restrictions */
|
|
|
|
BUILD_BUG_ON(PAGE_SIZE % DDE_BUFFER_ALIGN);
|
|
|
|
BUILD_BUG_ON(DDE_BUFFER_ALIGN % DDE_BUFFER_SIZE_MULT);
|
|
|
|
BUILD_BUG_ON(DDE_BUFFER_SIZE_MULT % DDE_BUFFER_LAST_MULT);
|
|
|
|
|
|
|
|
pr_info("loading\n");
|
|
|
|
|
2015-05-28 20:21:31 +00:00
|
|
|
for_each_compatible_node(dn, NULL, "ibm,power-nx")
|
2015-05-07 17:49:19 +00:00
|
|
|
nx842_powernv_probe(dn);
|
|
|
|
|
|
|
|
if (!nx842_ct) {
|
|
|
|
pr_err("no coprocessors found\n");
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
2015-05-28 20:21:31 +00:00
|
|
|
if (!nx842_platform_driver_set(&nx842_powernv_driver)) {
|
|
|
|
struct nx842_coproc *coproc, *n;
|
|
|
|
|
|
|
|
list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) {
|
|
|
|
list_del(&coproc->list);
|
|
|
|
kfree(coproc);
|
|
|
|
}
|
|
|
|
|
|
|
|
return -EEXIST;
|
|
|
|
}
|
2015-05-07 17:49:19 +00:00
|
|
|
|
|
|
|
pr_info("loaded\n");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
module_init(nx842_powernv_init);
|
|
|
|
|
|
|
|
static void __exit nx842_powernv_exit(void)
|
|
|
|
{
|
|
|
|
struct nx842_coproc *coproc, *n;
|
|
|
|
|
2015-05-28 20:21:31 +00:00
|
|
|
nx842_platform_driver_unset(&nx842_powernv_driver);
|
2015-05-07 17:49:19 +00:00
|
|
|
|
|
|
|
list_for_each_entry_safe(coproc, n, &nx842_coprocs, list) {
|
|
|
|
list_del(&coproc->list);
|
|
|
|
kfree(coproc);
|
|
|
|
}
|
|
|
|
|
|
|
|
pr_info("unloaded\n");
|
|
|
|
}
|
|
|
|
module_exit(nx842_powernv_exit);
|