c47d63020c
Add support to the nx-842-pseries.c driver for running in little endian mode. The pSeries platform NX 842 driver currently only works as big endian. This adds cpu_to_be*() and be*_to_cpu() in the appropriate places to work in LE mode also. Signed-off-by: Dan Streetman <ddstreet@ieee.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
1141 lines
32 KiB
C
1141 lines
32 KiB
C
/*
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* Driver for IBM Power 842 compression accelerator
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (C) IBM Corporation, 2012
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*
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* Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
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* Seth Jennings <sjenning@linux.vnet.ibm.com>
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*/
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#include <asm/vio.h>
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#include "nx-842.h"
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#include "nx_csbcpb.h" /* struct nx_csbcpb */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>");
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MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
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static struct nx842_constraints nx842_pseries_constraints = {
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.alignment = DDE_BUFFER_ALIGN,
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.multiple = DDE_BUFFER_LAST_MULT,
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.minimum = DDE_BUFFER_LAST_MULT,
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.maximum = PAGE_SIZE, /* dynamic, max_sync_size */
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};
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static int check_constraints(unsigned long buf, unsigned int *len, bool in)
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{
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if (!IS_ALIGNED(buf, nx842_pseries_constraints.alignment)) {
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pr_debug("%s buffer 0x%lx not aligned to 0x%x\n",
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in ? "input" : "output", buf,
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nx842_pseries_constraints.alignment);
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return -EINVAL;
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}
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if (*len % nx842_pseries_constraints.multiple) {
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pr_debug("%s buffer len 0x%x not multiple of 0x%x\n",
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in ? "input" : "output", *len,
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nx842_pseries_constraints.multiple);
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if (in)
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return -EINVAL;
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*len = round_down(*len, nx842_pseries_constraints.multiple);
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}
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if (*len < nx842_pseries_constraints.minimum) {
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pr_debug("%s buffer len 0x%x under minimum 0x%x\n",
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in ? "input" : "output", *len,
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nx842_pseries_constraints.minimum);
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return -EINVAL;
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}
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if (*len > nx842_pseries_constraints.maximum) {
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pr_debug("%s buffer len 0x%x over maximum 0x%x\n",
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in ? "input" : "output", *len,
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nx842_pseries_constraints.maximum);
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if (in)
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return -EINVAL;
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*len = nx842_pseries_constraints.maximum;
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}
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return 0;
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}
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/* I assume we need to align the CSB? */
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#define WORKMEM_ALIGN (256)
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struct nx842_workmem {
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/* scatterlist */
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char slin[4096];
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char slout[4096];
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/* coprocessor status/parameter block */
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struct nx_csbcpb csbcpb;
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char padding[WORKMEM_ALIGN];
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} __aligned(WORKMEM_ALIGN);
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/* Macros for fields within nx_csbcpb */
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/* Check the valid bit within the csbcpb valid field */
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#define NX842_CSBCBP_VALID_CHK(x) (x & BIT_MASK(7))
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/* CE macros operate on the completion_extension field bits in the csbcpb.
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* CE0 0=full completion, 1=partial completion
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* CE1 0=CE0 indicates completion, 1=termination (output may be modified)
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* CE2 0=processed_bytes is source bytes, 1=processed_bytes is target bytes */
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#define NX842_CSBCPB_CE0(x) (x & BIT_MASK(7))
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#define NX842_CSBCPB_CE1(x) (x & BIT_MASK(6))
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#define NX842_CSBCPB_CE2(x) (x & BIT_MASK(5))
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/* The NX unit accepts data only on 4K page boundaries */
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#define NX842_HW_PAGE_SIZE (4096)
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#define NX842_HW_PAGE_MASK (~(NX842_HW_PAGE_SIZE-1))
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enum nx842_status {
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UNAVAILABLE,
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AVAILABLE
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};
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struct ibm_nx842_counters {
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atomic64_t comp_complete;
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atomic64_t comp_failed;
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atomic64_t decomp_complete;
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atomic64_t decomp_failed;
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atomic64_t swdecomp;
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atomic64_t comp_times[32];
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atomic64_t decomp_times[32];
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};
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static struct nx842_devdata {
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struct vio_dev *vdev;
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struct device *dev;
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struct ibm_nx842_counters *counters;
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unsigned int max_sg_len;
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unsigned int max_sync_size;
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unsigned int max_sync_sg;
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enum nx842_status status;
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} __rcu *devdata;
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static DEFINE_SPINLOCK(devdata_mutex);
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#define NX842_COUNTER_INC(_x) \
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static inline void nx842_inc_##_x( \
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const struct nx842_devdata *dev) { \
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if (dev) \
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atomic64_inc(&dev->counters->_x); \
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}
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NX842_COUNTER_INC(comp_complete);
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NX842_COUNTER_INC(comp_failed);
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NX842_COUNTER_INC(decomp_complete);
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NX842_COUNTER_INC(decomp_failed);
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NX842_COUNTER_INC(swdecomp);
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#define NX842_HIST_SLOTS 16
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static void ibm_nx842_incr_hist(atomic64_t *times, unsigned int time)
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{
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int bucket = fls(time);
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if (bucket)
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bucket = min((NX842_HIST_SLOTS - 1), bucket - 1);
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atomic64_inc(×[bucket]);
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}
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/* NX unit operation flags */
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#define NX842_OP_COMPRESS 0x0
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#define NX842_OP_CRC 0x1
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#define NX842_OP_DECOMPRESS 0x2
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#define NX842_OP_COMPRESS_CRC (NX842_OP_COMPRESS | NX842_OP_CRC)
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#define NX842_OP_DECOMPRESS_CRC (NX842_OP_DECOMPRESS | NX842_OP_CRC)
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#define NX842_OP_ASYNC (1<<23)
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#define NX842_OP_NOTIFY (1<<22)
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#define NX842_OP_NOTIFY_INT(x) ((x & 0xff)<<8)
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static unsigned long nx842_get_desired_dma(struct vio_dev *viodev)
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{
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/* No use of DMA mappings within the driver. */
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return 0;
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}
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struct nx842_slentry {
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__be64 ptr; /* Real address (use __pa()) */
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__be64 len;
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};
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/* pHyp scatterlist entry */
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struct nx842_scatterlist {
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int entry_nr; /* number of slentries */
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struct nx842_slentry *entries; /* ptr to array of slentries */
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};
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/* Does not include sizeof(entry_nr) in the size */
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static inline unsigned long nx842_get_scatterlist_size(
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struct nx842_scatterlist *sl)
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{
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return sl->entry_nr * sizeof(struct nx842_slentry);
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}
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static int nx842_build_scatterlist(unsigned long buf, int len,
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struct nx842_scatterlist *sl)
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{
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unsigned long entrylen;
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struct nx842_slentry *entry;
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sl->entry_nr = 0;
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entry = sl->entries;
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while (len) {
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entry->ptr = cpu_to_be64(nx842_get_pa((void *)buf));
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entrylen = min_t(int, len,
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LEN_ON_SIZE(buf, NX842_HW_PAGE_SIZE));
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entry->len = cpu_to_be64(entrylen);
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len -= entrylen;
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buf += entrylen;
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sl->entry_nr++;
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entry++;
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}
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return 0;
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}
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static int nx842_validate_result(struct device *dev,
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struct cop_status_block *csb)
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{
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/* The csb must be valid after returning from vio_h_cop_sync */
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if (!NX842_CSBCBP_VALID_CHK(csb->valid)) {
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dev_err(dev, "%s: cspcbp not valid upon completion.\n",
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__func__);
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dev_dbg(dev, "valid:0x%02x cs:0x%02x cc:0x%02x ce:0x%02x\n",
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csb->valid,
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csb->crb_seq_number,
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csb->completion_code,
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csb->completion_extension);
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dev_dbg(dev, "processed_bytes:%d address:0x%016lx\n",
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be32_to_cpu(csb->processed_byte_count),
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(unsigned long)be64_to_cpu(csb->address));
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return -EIO;
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}
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/* Check return values from the hardware in the CSB */
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switch (csb->completion_code) {
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case 0: /* Completed without error */
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break;
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case 64: /* Target bytes > Source bytes during compression */
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case 13: /* Output buffer too small */
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dev_dbg(dev, "%s: Compression output larger than input\n",
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__func__);
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return -ENOSPC;
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case 66: /* Input data contains an illegal template field */
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case 67: /* Template indicates data past the end of the input stream */
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dev_dbg(dev, "%s: Bad data for decompression (code:%d)\n",
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__func__, csb->completion_code);
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return -EINVAL;
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default:
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dev_dbg(dev, "%s: Unspecified error (code:%d)\n",
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__func__, csb->completion_code);
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return -EIO;
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}
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/* Hardware sanity check */
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if (!NX842_CSBCPB_CE2(csb->completion_extension)) {
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dev_err(dev, "%s: No error returned by hardware, but "
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"data returned is unusable, contact support.\n"
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"(Additional info: csbcbp->processed bytes "
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"does not specify processed bytes for the "
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"target buffer.)\n", __func__);
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return -EIO;
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}
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return 0;
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}
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/**
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* nx842_pseries_compress - Compress data using the 842 algorithm
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*
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* Compression provide by the NX842 coprocessor on IBM Power systems.
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* The input buffer is compressed and the result is stored in the
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* provided output buffer.
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*
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* Upon return from this function @outlen contains the length of the
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* compressed data. If there is an error then @outlen will be 0 and an
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* error will be specified by the return code from this function.
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*
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* @in: Pointer to input buffer
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* @inlen: Length of input buffer
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* @out: Pointer to output buffer
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* @outlen: Length of output buffer
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* @wrkmem: ptr to buffer for working memory, size determined by
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* nx842_pseries_driver.workmem_size
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*
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* Returns:
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* 0 Success, output of length @outlen stored in the buffer at @out
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* -ENOMEM Unable to allocate internal buffers
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* -ENOSPC Output buffer is to small
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* -EIO Internal error
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* -ENODEV Hardware unavailable
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*/
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static int nx842_pseries_compress(const unsigned char *in, unsigned int inlen,
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unsigned char *out, unsigned int *outlen,
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void *wmem)
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{
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struct nx842_devdata *local_devdata;
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struct device *dev = NULL;
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struct nx842_workmem *workmem;
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struct nx842_scatterlist slin, slout;
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struct nx_csbcpb *csbcpb;
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int ret = 0, max_sync_size;
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unsigned long inbuf, outbuf;
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struct vio_pfo_op op = {
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.done = NULL,
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.handle = 0,
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.timeout = 0,
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};
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unsigned long start = get_tb();
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inbuf = (unsigned long)in;
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if (check_constraints(inbuf, &inlen, true))
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return -EINVAL;
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outbuf = (unsigned long)out;
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if (check_constraints(outbuf, outlen, false))
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return -EINVAL;
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rcu_read_lock();
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local_devdata = rcu_dereference(devdata);
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if (!local_devdata || !local_devdata->dev) {
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rcu_read_unlock();
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return -ENODEV;
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}
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max_sync_size = local_devdata->max_sync_size;
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dev = local_devdata->dev;
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/* Init scatterlist */
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workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN);
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slin.entries = (struct nx842_slentry *)workmem->slin;
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slout.entries = (struct nx842_slentry *)workmem->slout;
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/* Init operation */
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op.flags = NX842_OP_COMPRESS;
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csbcpb = &workmem->csbcpb;
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memset(csbcpb, 0, sizeof(*csbcpb));
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op.csbcpb = nx842_get_pa(csbcpb);
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if ((inbuf & NX842_HW_PAGE_MASK) ==
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((inbuf + inlen - 1) & NX842_HW_PAGE_MASK)) {
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/* Create direct DDE */
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op.in = nx842_get_pa((void *)inbuf);
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op.inlen = inlen;
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} else {
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/* Create indirect DDE (scatterlist) */
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nx842_build_scatterlist(inbuf, inlen, &slin);
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op.in = nx842_get_pa(slin.entries);
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op.inlen = -nx842_get_scatterlist_size(&slin);
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}
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if ((outbuf & NX842_HW_PAGE_MASK) ==
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((outbuf + *outlen - 1) & NX842_HW_PAGE_MASK)) {
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/* Create direct DDE */
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op.out = nx842_get_pa((void *)outbuf);
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op.outlen = *outlen;
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} else {
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/* Create indirect DDE (scatterlist) */
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nx842_build_scatterlist(outbuf, *outlen, &slout);
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op.out = nx842_get_pa(slout.entries);
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op.outlen = -nx842_get_scatterlist_size(&slout);
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}
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dev_dbg(dev, "%s: op.in %lx op.inlen %ld op.out %lx op.outlen %ld\n",
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__func__, (unsigned long)op.in, (long)op.inlen,
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(unsigned long)op.out, (long)op.outlen);
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/* Send request to pHyp */
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ret = vio_h_cop_sync(local_devdata->vdev, &op);
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/* Check for pHyp error */
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if (ret) {
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dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n",
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__func__, ret, op.hcall_err);
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ret = -EIO;
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goto unlock;
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}
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|
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/* Check for hardware error */
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ret = nx842_validate_result(dev, &csbcpb->csb);
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if (ret)
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goto unlock;
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*outlen = be32_to_cpu(csbcpb->csb.processed_byte_count);
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dev_dbg(dev, "%s: processed_bytes=%d\n", __func__, *outlen);
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unlock:
|
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if (ret)
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nx842_inc_comp_failed(local_devdata);
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else {
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nx842_inc_comp_complete(local_devdata);
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ibm_nx842_incr_hist(local_devdata->counters->comp_times,
|
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(get_tb() - start) / tb_ticks_per_usec);
|
||
}
|
||
rcu_read_unlock();
|
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return ret;
|
||
}
|
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|
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/**
|
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* nx842_pseries_decompress - Decompress data using the 842 algorithm
|
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*
|
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* Decompression provide by the NX842 coprocessor on IBM Power systems.
|
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* The input buffer is decompressed and the result is stored in the
|
||
* provided output buffer. The size allocated to the output buffer is
|
||
* provided by the caller of this function in @outlen. Upon return from
|
||
* this function @outlen contains the length of the decompressed data.
|
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* If there is an error then @outlen will be 0 and an error will be
|
||
* specified by the return code from this function.
|
||
*
|
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* @in: Pointer to input buffer
|
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* @inlen: Length of input buffer
|
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* @out: Pointer to output buffer
|
||
* @outlen: Length of output buffer
|
||
* @wrkmem: ptr to buffer for working memory, size determined by
|
||
* nx842_pseries_driver.workmem_size
|
||
*
|
||
* Returns:
|
||
* 0 Success, output of length @outlen stored in the buffer at @out
|
||
* -ENODEV Hardware decompression device is unavailable
|
||
* -ENOMEM Unable to allocate internal buffers
|
||
* -ENOSPC Output buffer is to small
|
||
* -EINVAL Bad input data encountered when attempting decompress
|
||
* -EIO Internal error
|
||
*/
|
||
static int nx842_pseries_decompress(const unsigned char *in, unsigned int inlen,
|
||
unsigned char *out, unsigned int *outlen,
|
||
void *wmem)
|
||
{
|
||
struct nx842_devdata *local_devdata;
|
||
struct device *dev = NULL;
|
||
struct nx842_workmem *workmem;
|
||
struct nx842_scatterlist slin, slout;
|
||
struct nx_csbcpb *csbcpb;
|
||
int ret = 0, max_sync_size;
|
||
unsigned long inbuf, outbuf;
|
||
struct vio_pfo_op op = {
|
||
.done = NULL,
|
||
.handle = 0,
|
||
.timeout = 0,
|
||
};
|
||
unsigned long start = get_tb();
|
||
|
||
/* Ensure page alignment and size */
|
||
inbuf = (unsigned long)in;
|
||
if (check_constraints(inbuf, &inlen, true))
|
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return -EINVAL;
|
||
|
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outbuf = (unsigned long)out;
|
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if (check_constraints(outbuf, outlen, false))
|
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return -EINVAL;
|
||
|
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rcu_read_lock();
|
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local_devdata = rcu_dereference(devdata);
|
||
if (!local_devdata || !local_devdata->dev) {
|
||
rcu_read_unlock();
|
||
return -ENODEV;
|
||
}
|
||
max_sync_size = local_devdata->max_sync_size;
|
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dev = local_devdata->dev;
|
||
|
||
workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN);
|
||
|
||
/* Init scatterlist */
|
||
slin.entries = (struct nx842_slentry *)workmem->slin;
|
||
slout.entries = (struct nx842_slentry *)workmem->slout;
|
||
|
||
/* Init operation */
|
||
op.flags = NX842_OP_DECOMPRESS;
|
||
csbcpb = &workmem->csbcpb;
|
||
memset(csbcpb, 0, sizeof(*csbcpb));
|
||
op.csbcpb = nx842_get_pa(csbcpb);
|
||
|
||
if ((inbuf & NX842_HW_PAGE_MASK) ==
|
||
((inbuf + inlen - 1) & NX842_HW_PAGE_MASK)) {
|
||
/* Create direct DDE */
|
||
op.in = nx842_get_pa((void *)inbuf);
|
||
op.inlen = inlen;
|
||
} else {
|
||
/* Create indirect DDE (scatterlist) */
|
||
nx842_build_scatterlist(inbuf, inlen, &slin);
|
||
op.in = nx842_get_pa(slin.entries);
|
||
op.inlen = -nx842_get_scatterlist_size(&slin);
|
||
}
|
||
|
||
if ((outbuf & NX842_HW_PAGE_MASK) ==
|
||
((outbuf + *outlen - 1) & NX842_HW_PAGE_MASK)) {
|
||
/* Create direct DDE */
|
||
op.out = nx842_get_pa((void *)outbuf);
|
||
op.outlen = *outlen;
|
||
} else {
|
||
/* Create indirect DDE (scatterlist) */
|
||
nx842_build_scatterlist(outbuf, *outlen, &slout);
|
||
op.out = nx842_get_pa(slout.entries);
|
||
op.outlen = -nx842_get_scatterlist_size(&slout);
|
||
}
|
||
|
||
dev_dbg(dev, "%s: op.in %lx op.inlen %ld op.out %lx op.outlen %ld\n",
|
||
__func__, (unsigned long)op.in, (long)op.inlen,
|
||
(unsigned long)op.out, (long)op.outlen);
|
||
|
||
/* Send request to pHyp */
|
||
ret = vio_h_cop_sync(local_devdata->vdev, &op);
|
||
|
||
/* Check for pHyp error */
|
||
if (ret) {
|
||
dev_dbg(dev, "%s: vio_h_cop_sync error (ret=%d, hret=%ld)\n",
|
||
__func__, ret, op.hcall_err);
|
||
goto unlock;
|
||
}
|
||
|
||
/* Check for hardware error */
|
||
ret = nx842_validate_result(dev, &csbcpb->csb);
|
||
if (ret)
|
||
goto unlock;
|
||
|
||
*outlen = be32_to_cpu(csbcpb->csb.processed_byte_count);
|
||
|
||
unlock:
|
||
if (ret)
|
||
/* decompress fail */
|
||
nx842_inc_decomp_failed(local_devdata);
|
||
else {
|
||
nx842_inc_decomp_complete(local_devdata);
|
||
ibm_nx842_incr_hist(local_devdata->counters->decomp_times,
|
||
(get_tb() - start) / tb_ticks_per_usec);
|
||
}
|
||
|
||
rcu_read_unlock();
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* nx842_OF_set_defaults -- Set default (disabled) values for devdata
|
||
*
|
||
* @devdata - struct nx842_devdata to update
|
||
*
|
||
* Returns:
|
||
* 0 on success
|
||
* -ENOENT if @devdata ptr is NULL
|
||
*/
|
||
static int nx842_OF_set_defaults(struct nx842_devdata *devdata)
|
||
{
|
||
if (devdata) {
|
||
devdata->max_sync_size = 0;
|
||
devdata->max_sync_sg = 0;
|
||
devdata->max_sg_len = 0;
|
||
devdata->status = UNAVAILABLE;
|
||
return 0;
|
||
} else
|
||
return -ENOENT;
|
||
}
|
||
|
||
/**
|
||
* nx842_OF_upd_status -- Update the device info from OF status prop
|
||
*
|
||
* The status property indicates if the accelerator is enabled. If the
|
||
* device is in the OF tree it indicates that the hardware is present.
|
||
* The status field indicates if the device is enabled when the status
|
||
* is 'okay'. Otherwise the device driver will be disabled.
|
||
*
|
||
* @devdata - struct nx842_devdata to update
|
||
* @prop - struct property point containing the maxsyncop for the update
|
||
*
|
||
* Returns:
|
||
* 0 - Device is available
|
||
* -EINVAL - Device is not available
|
||
*/
|
||
static int nx842_OF_upd_status(struct nx842_devdata *devdata,
|
||
struct property *prop) {
|
||
int ret = 0;
|
||
const char *status = (const char *)prop->value;
|
||
|
||
if (!strncmp(status, "okay", (size_t)prop->length)) {
|
||
devdata->status = AVAILABLE;
|
||
} else {
|
||
dev_info(devdata->dev, "%s: status '%s' is not 'okay'\n",
|
||
__func__, status);
|
||
devdata->status = UNAVAILABLE;
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* nx842_OF_upd_maxsglen -- Update the device info from OF maxsglen prop
|
||
*
|
||
* Definition of the 'ibm,max-sg-len' OF property:
|
||
* This field indicates the maximum byte length of a scatter list
|
||
* for the platform facility. It is a single cell encoded as with encode-int.
|
||
*
|
||
* Example:
|
||
* # od -x ibm,max-sg-len
|
||
* 0000000 0000 0ff0
|
||
*
|
||
* In this example, the maximum byte length of a scatter list is
|
||
* 0x0ff0 (4,080).
|
||
*
|
||
* @devdata - struct nx842_devdata to update
|
||
* @prop - struct property point containing the maxsyncop for the update
|
||
*
|
||
* Returns:
|
||
* 0 on success
|
||
* -EINVAL on failure
|
||
*/
|
||
static int nx842_OF_upd_maxsglen(struct nx842_devdata *devdata,
|
||
struct property *prop) {
|
||
int ret = 0;
|
||
const unsigned int maxsglen = of_read_number(prop->value, 1);
|
||
|
||
if (prop->length != sizeof(maxsglen)) {
|
||
dev_err(devdata->dev, "%s: unexpected format for ibm,max-sg-len property\n", __func__);
|
||
dev_dbg(devdata->dev, "%s: ibm,max-sg-len is %d bytes long, expected %lu bytes\n", __func__,
|
||
prop->length, sizeof(maxsglen));
|
||
ret = -EINVAL;
|
||
} else {
|
||
devdata->max_sg_len = min_t(unsigned int,
|
||
maxsglen, NX842_HW_PAGE_SIZE);
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* nx842_OF_upd_maxsyncop -- Update the device info from OF maxsyncop prop
|
||
*
|
||
* Definition of the 'ibm,max-sync-cop' OF property:
|
||
* Two series of cells. The first series of cells represents the maximums
|
||
* that can be synchronously compressed. The second series of cells
|
||
* represents the maximums that can be synchronously decompressed.
|
||
* 1. The first cell in each series contains the count of the number of
|
||
* data length, scatter list elements pairs that follow – each being
|
||
* of the form
|
||
* a. One cell data byte length
|
||
* b. One cell total number of scatter list elements
|
||
*
|
||
* Example:
|
||
* # od -x ibm,max-sync-cop
|
||
* 0000000 0000 0001 0000 1000 0000 01fe 0000 0001
|
||
* 0000020 0000 1000 0000 01fe
|
||
*
|
||
* In this example, compression supports 0x1000 (4,096) data byte length
|
||
* and 0x1fe (510) total scatter list elements. Decompression supports
|
||
* 0x1000 (4,096) data byte length and 0x1f3 (510) total scatter list
|
||
* elements.
|
||
*
|
||
* @devdata - struct nx842_devdata to update
|
||
* @prop - struct property point containing the maxsyncop for the update
|
||
*
|
||
* Returns:
|
||
* 0 on success
|
||
* -EINVAL on failure
|
||
*/
|
||
static int nx842_OF_upd_maxsyncop(struct nx842_devdata *devdata,
|
||
struct property *prop) {
|
||
int ret = 0;
|
||
unsigned int comp_data_limit, decomp_data_limit;
|
||
unsigned int comp_sg_limit, decomp_sg_limit;
|
||
const struct maxsynccop_t {
|
||
__be32 comp_elements;
|
||
__be32 comp_data_limit;
|
||
__be32 comp_sg_limit;
|
||
__be32 decomp_elements;
|
||
__be32 decomp_data_limit;
|
||
__be32 decomp_sg_limit;
|
||
} *maxsynccop;
|
||
|
||
if (prop->length != sizeof(*maxsynccop)) {
|
||
dev_err(devdata->dev, "%s: unexpected format for ibm,max-sync-cop property\n", __func__);
|
||
dev_dbg(devdata->dev, "%s: ibm,max-sync-cop is %d bytes long, expected %lu bytes\n", __func__, prop->length,
|
||
sizeof(*maxsynccop));
|
||
ret = -EINVAL;
|
||
goto out;
|
||
}
|
||
|
||
maxsynccop = (const struct maxsynccop_t *)prop->value;
|
||
comp_data_limit = be32_to_cpu(maxsynccop->comp_data_limit);
|
||
comp_sg_limit = be32_to_cpu(maxsynccop->comp_sg_limit);
|
||
decomp_data_limit = be32_to_cpu(maxsynccop->decomp_data_limit);
|
||
decomp_sg_limit = be32_to_cpu(maxsynccop->decomp_sg_limit);
|
||
|
||
/* Use one limit rather than separate limits for compression and
|
||
* decompression. Set a maximum for this so as not to exceed the
|
||
* size that the header can support and round the value down to
|
||
* the hardware page size (4K) */
|
||
devdata->max_sync_size = min(comp_data_limit, decomp_data_limit);
|
||
|
||
devdata->max_sync_size = min_t(unsigned int, devdata->max_sync_size,
|
||
65536);
|
||
|
||
if (devdata->max_sync_size < 4096) {
|
||
dev_err(devdata->dev, "%s: hardware max data size (%u) is "
|
||
"less than the driver minimum, unable to use "
|
||
"the hardware device\n",
|
||
__func__, devdata->max_sync_size);
|
||
ret = -EINVAL;
|
||
goto out;
|
||
}
|
||
|
||
nx842_pseries_constraints.maximum = devdata->max_sync_size;
|
||
|
||
devdata->max_sync_sg = min(comp_sg_limit, decomp_sg_limit);
|
||
if (devdata->max_sync_sg < 1) {
|
||
dev_err(devdata->dev, "%s: hardware max sg size (%u) is "
|
||
"less than the driver minimum, unable to use "
|
||
"the hardware device\n",
|
||
__func__, devdata->max_sync_sg);
|
||
ret = -EINVAL;
|
||
goto out;
|
||
}
|
||
|
||
out:
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
*
|
||
* nx842_OF_upd -- Handle OF properties updates for the device.
|
||
*
|
||
* Set all properties from the OF tree. Optionally, a new property
|
||
* can be provided by the @new_prop pointer to overwrite an existing value.
|
||
* The device will remain disabled until all values are valid, this function
|
||
* will return an error for updates unless all values are valid.
|
||
*
|
||
* @new_prop: If not NULL, this property is being updated. If NULL, update
|
||
* all properties from the current values in the OF tree.
|
||
*
|
||
* Returns:
|
||
* 0 - Success
|
||
* -ENOMEM - Could not allocate memory for new devdata structure
|
||
* -EINVAL - property value not found, new_prop is not a recognized
|
||
* property for the device or property value is not valid.
|
||
* -ENODEV - Device is not available
|
||
*/
|
||
static int nx842_OF_upd(struct property *new_prop)
|
||
{
|
||
struct nx842_devdata *old_devdata = NULL;
|
||
struct nx842_devdata *new_devdata = NULL;
|
||
struct device_node *of_node = NULL;
|
||
struct property *status = NULL;
|
||
struct property *maxsglen = NULL;
|
||
struct property *maxsyncop = NULL;
|
||
int ret = 0;
|
||
unsigned long flags;
|
||
|
||
spin_lock_irqsave(&devdata_mutex, flags);
|
||
old_devdata = rcu_dereference_check(devdata,
|
||
lockdep_is_held(&devdata_mutex));
|
||
if (old_devdata)
|
||
of_node = old_devdata->dev->of_node;
|
||
|
||
if (!old_devdata || !of_node) {
|
||
pr_err("%s: device is not available\n", __func__);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
return -ENODEV;
|
||
}
|
||
|
||
new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS);
|
||
if (!new_devdata) {
|
||
dev_err(old_devdata->dev, "%s: Could not allocate memory for device data\n", __func__);
|
||
ret = -ENOMEM;
|
||
goto error_out;
|
||
}
|
||
|
||
memcpy(new_devdata, old_devdata, sizeof(*old_devdata));
|
||
new_devdata->counters = old_devdata->counters;
|
||
|
||
/* Set ptrs for existing properties */
|
||
status = of_find_property(of_node, "status", NULL);
|
||
maxsglen = of_find_property(of_node, "ibm,max-sg-len", NULL);
|
||
maxsyncop = of_find_property(of_node, "ibm,max-sync-cop", NULL);
|
||
if (!status || !maxsglen || !maxsyncop) {
|
||
dev_err(old_devdata->dev, "%s: Could not locate device properties\n", __func__);
|
||
ret = -EINVAL;
|
||
goto error_out;
|
||
}
|
||
|
||
/*
|
||
* If this is a property update, there are only certain properties that
|
||
* we care about. Bail if it isn't in the below list
|
||
*/
|
||
if (new_prop && (strncmp(new_prop->name, "status", new_prop->length) ||
|
||
strncmp(new_prop->name, "ibm,max-sg-len", new_prop->length) ||
|
||
strncmp(new_prop->name, "ibm,max-sync-cop", new_prop->length)))
|
||
goto out;
|
||
|
||
/* Perform property updates */
|
||
ret = nx842_OF_upd_status(new_devdata, status);
|
||
if (ret)
|
||
goto error_out;
|
||
|
||
ret = nx842_OF_upd_maxsglen(new_devdata, maxsglen);
|
||
if (ret)
|
||
goto error_out;
|
||
|
||
ret = nx842_OF_upd_maxsyncop(new_devdata, maxsyncop);
|
||
if (ret)
|
||
goto error_out;
|
||
|
||
out:
|
||
dev_info(old_devdata->dev, "%s: max_sync_size new:%u old:%u\n",
|
||
__func__, new_devdata->max_sync_size,
|
||
old_devdata->max_sync_size);
|
||
dev_info(old_devdata->dev, "%s: max_sync_sg new:%u old:%u\n",
|
||
__func__, new_devdata->max_sync_sg,
|
||
old_devdata->max_sync_sg);
|
||
dev_info(old_devdata->dev, "%s: max_sg_len new:%u old:%u\n",
|
||
__func__, new_devdata->max_sg_len,
|
||
old_devdata->max_sg_len);
|
||
|
||
rcu_assign_pointer(devdata, new_devdata);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
synchronize_rcu();
|
||
dev_set_drvdata(new_devdata->dev, new_devdata);
|
||
kfree(old_devdata);
|
||
return 0;
|
||
|
||
error_out:
|
||
if (new_devdata) {
|
||
dev_info(old_devdata->dev, "%s: device disabled\n", __func__);
|
||
nx842_OF_set_defaults(new_devdata);
|
||
rcu_assign_pointer(devdata, new_devdata);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
synchronize_rcu();
|
||
dev_set_drvdata(new_devdata->dev, new_devdata);
|
||
kfree(old_devdata);
|
||
} else {
|
||
dev_err(old_devdata->dev, "%s: could not update driver from hardware\n", __func__);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
}
|
||
|
||
if (!ret)
|
||
ret = -EINVAL;
|
||
return ret;
|
||
}
|
||
|
||
/**
|
||
* nx842_OF_notifier - Process updates to OF properties for the device
|
||
*
|
||
* @np: notifier block
|
||
* @action: notifier action
|
||
* @update: struct pSeries_reconfig_prop_update pointer if action is
|
||
* PSERIES_UPDATE_PROPERTY
|
||
*
|
||
* Returns:
|
||
* NOTIFY_OK on success
|
||
* NOTIFY_BAD encoded with error number on failure, use
|
||
* notifier_to_errno() to decode this value
|
||
*/
|
||
static int nx842_OF_notifier(struct notifier_block *np, unsigned long action,
|
||
void *data)
|
||
{
|
||
struct of_reconfig_data *upd = data;
|
||
struct nx842_devdata *local_devdata;
|
||
struct device_node *node = NULL;
|
||
|
||
rcu_read_lock();
|
||
local_devdata = rcu_dereference(devdata);
|
||
if (local_devdata)
|
||
node = local_devdata->dev->of_node;
|
||
|
||
if (local_devdata &&
|
||
action == OF_RECONFIG_UPDATE_PROPERTY &&
|
||
!strcmp(upd->dn->name, node->name)) {
|
||
rcu_read_unlock();
|
||
nx842_OF_upd(upd->prop);
|
||
} else
|
||
rcu_read_unlock();
|
||
|
||
return NOTIFY_OK;
|
||
}
|
||
|
||
static struct notifier_block nx842_of_nb = {
|
||
.notifier_call = nx842_OF_notifier,
|
||
};
|
||
|
||
#define nx842_counter_read(_name) \
|
||
static ssize_t nx842_##_name##_show(struct device *dev, \
|
||
struct device_attribute *attr, \
|
||
char *buf) { \
|
||
struct nx842_devdata *local_devdata; \
|
||
int p = 0; \
|
||
rcu_read_lock(); \
|
||
local_devdata = rcu_dereference(devdata); \
|
||
if (local_devdata) \
|
||
p = snprintf(buf, PAGE_SIZE, "%ld\n", \
|
||
atomic64_read(&local_devdata->counters->_name)); \
|
||
rcu_read_unlock(); \
|
||
return p; \
|
||
}
|
||
|
||
#define NX842DEV_COUNTER_ATTR_RO(_name) \
|
||
nx842_counter_read(_name); \
|
||
static struct device_attribute dev_attr_##_name = __ATTR(_name, \
|
||
0444, \
|
||
nx842_##_name##_show,\
|
||
NULL);
|
||
|
||
NX842DEV_COUNTER_ATTR_RO(comp_complete);
|
||
NX842DEV_COUNTER_ATTR_RO(comp_failed);
|
||
NX842DEV_COUNTER_ATTR_RO(decomp_complete);
|
||
NX842DEV_COUNTER_ATTR_RO(decomp_failed);
|
||
NX842DEV_COUNTER_ATTR_RO(swdecomp);
|
||
|
||
static ssize_t nx842_timehist_show(struct device *,
|
||
struct device_attribute *, char *);
|
||
|
||
static struct device_attribute dev_attr_comp_times = __ATTR(comp_times, 0444,
|
||
nx842_timehist_show, NULL);
|
||
static struct device_attribute dev_attr_decomp_times = __ATTR(decomp_times,
|
||
0444, nx842_timehist_show, NULL);
|
||
|
||
static ssize_t nx842_timehist_show(struct device *dev,
|
||
struct device_attribute *attr, char *buf) {
|
||
char *p = buf;
|
||
struct nx842_devdata *local_devdata;
|
||
atomic64_t *times;
|
||
int bytes_remain = PAGE_SIZE;
|
||
int bytes;
|
||
int i;
|
||
|
||
rcu_read_lock();
|
||
local_devdata = rcu_dereference(devdata);
|
||
if (!local_devdata) {
|
||
rcu_read_unlock();
|
||
return 0;
|
||
}
|
||
|
||
if (attr == &dev_attr_comp_times)
|
||
times = local_devdata->counters->comp_times;
|
||
else if (attr == &dev_attr_decomp_times)
|
||
times = local_devdata->counters->decomp_times;
|
||
else {
|
||
rcu_read_unlock();
|
||
return 0;
|
||
}
|
||
|
||
for (i = 0; i < (NX842_HIST_SLOTS - 2); i++) {
|
||
bytes = snprintf(p, bytes_remain, "%u-%uus:\t%ld\n",
|
||
i ? (2<<(i-1)) : 0, (2<<i)-1,
|
||
atomic64_read(×[i]));
|
||
bytes_remain -= bytes;
|
||
p += bytes;
|
||
}
|
||
/* The last bucket holds everything over
|
||
* 2<<(NX842_HIST_SLOTS - 2) us */
|
||
bytes = snprintf(p, bytes_remain, "%uus - :\t%ld\n",
|
||
2<<(NX842_HIST_SLOTS - 2),
|
||
atomic64_read(×[(NX842_HIST_SLOTS - 1)]));
|
||
p += bytes;
|
||
|
||
rcu_read_unlock();
|
||
return p - buf;
|
||
}
|
||
|
||
static struct attribute *nx842_sysfs_entries[] = {
|
||
&dev_attr_comp_complete.attr,
|
||
&dev_attr_comp_failed.attr,
|
||
&dev_attr_decomp_complete.attr,
|
||
&dev_attr_decomp_failed.attr,
|
||
&dev_attr_swdecomp.attr,
|
||
&dev_attr_comp_times.attr,
|
||
&dev_attr_decomp_times.attr,
|
||
NULL,
|
||
};
|
||
|
||
static struct attribute_group nx842_attribute_group = {
|
||
.name = NULL, /* put in device directory */
|
||
.attrs = nx842_sysfs_entries,
|
||
};
|
||
|
||
static struct nx842_driver nx842_pseries_driver = {
|
||
.name = KBUILD_MODNAME,
|
||
.owner = THIS_MODULE,
|
||
.workmem_size = sizeof(struct nx842_workmem),
|
||
.constraints = &nx842_pseries_constraints,
|
||
.compress = nx842_pseries_compress,
|
||
.decompress = nx842_pseries_decompress,
|
||
};
|
||
|
||
static int __init nx842_probe(struct vio_dev *viodev,
|
||
const struct vio_device_id *id)
|
||
{
|
||
struct nx842_devdata *old_devdata, *new_devdata = NULL;
|
||
unsigned long flags;
|
||
int ret = 0;
|
||
|
||
spin_lock_irqsave(&devdata_mutex, flags);
|
||
old_devdata = rcu_dereference_check(devdata,
|
||
lockdep_is_held(&devdata_mutex));
|
||
|
||
if (old_devdata && old_devdata->vdev != NULL) {
|
||
dev_err(&viodev->dev, "%s: Attempt to register more than one instance of the hardware\n", __func__);
|
||
ret = -1;
|
||
goto error_unlock;
|
||
}
|
||
|
||
dev_set_drvdata(&viodev->dev, NULL);
|
||
|
||
new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS);
|
||
if (!new_devdata) {
|
||
dev_err(&viodev->dev, "%s: Could not allocate memory for device data\n", __func__);
|
||
ret = -ENOMEM;
|
||
goto error_unlock;
|
||
}
|
||
|
||
new_devdata->counters = kzalloc(sizeof(*new_devdata->counters),
|
||
GFP_NOFS);
|
||
if (!new_devdata->counters) {
|
||
dev_err(&viodev->dev, "%s: Could not allocate memory for performance counters\n", __func__);
|
||
ret = -ENOMEM;
|
||
goto error_unlock;
|
||
}
|
||
|
||
new_devdata->vdev = viodev;
|
||
new_devdata->dev = &viodev->dev;
|
||
nx842_OF_set_defaults(new_devdata);
|
||
|
||
rcu_assign_pointer(devdata, new_devdata);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
synchronize_rcu();
|
||
kfree(old_devdata);
|
||
|
||
of_reconfig_notifier_register(&nx842_of_nb);
|
||
|
||
ret = nx842_OF_upd(NULL);
|
||
if (ret && ret != -ENODEV) {
|
||
dev_err(&viodev->dev, "could not parse device tree. %d\n", ret);
|
||
ret = -1;
|
||
goto error;
|
||
}
|
||
|
||
rcu_read_lock();
|
||
dev_set_drvdata(&viodev->dev, rcu_dereference(devdata));
|
||
rcu_read_unlock();
|
||
|
||
if (sysfs_create_group(&viodev->dev.kobj, &nx842_attribute_group)) {
|
||
dev_err(&viodev->dev, "could not create sysfs device attributes\n");
|
||
ret = -1;
|
||
goto error;
|
||
}
|
||
|
||
return 0;
|
||
|
||
error_unlock:
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
if (new_devdata)
|
||
kfree(new_devdata->counters);
|
||
kfree(new_devdata);
|
||
error:
|
||
return ret;
|
||
}
|
||
|
||
static int __exit nx842_remove(struct vio_dev *viodev)
|
||
{
|
||
struct nx842_devdata *old_devdata;
|
||
unsigned long flags;
|
||
|
||
pr_info("Removing IBM Power 842 compression device\n");
|
||
sysfs_remove_group(&viodev->dev.kobj, &nx842_attribute_group);
|
||
|
||
spin_lock_irqsave(&devdata_mutex, flags);
|
||
old_devdata = rcu_dereference_check(devdata,
|
||
lockdep_is_held(&devdata_mutex));
|
||
of_reconfig_notifier_unregister(&nx842_of_nb);
|
||
RCU_INIT_POINTER(devdata, NULL);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
synchronize_rcu();
|
||
dev_set_drvdata(&viodev->dev, NULL);
|
||
if (old_devdata)
|
||
kfree(old_devdata->counters);
|
||
kfree(old_devdata);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static struct vio_device_id nx842_vio_driver_ids[] = {
|
||
{"ibm,compression-v1", "ibm,compression"},
|
||
{"", ""},
|
||
};
|
||
|
||
static struct vio_driver nx842_vio_driver = {
|
||
.name = KBUILD_MODNAME,
|
||
.probe = nx842_probe,
|
||
.remove = __exit_p(nx842_remove),
|
||
.get_desired_dma = nx842_get_desired_dma,
|
||
.id_table = nx842_vio_driver_ids,
|
||
};
|
||
|
||
static int __init nx842_init(void)
|
||
{
|
||
struct nx842_devdata *new_devdata;
|
||
int ret;
|
||
|
||
pr_info("Registering IBM Power 842 compression driver\n");
|
||
|
||
if (!of_find_compatible_node(NULL, NULL, "ibm,compression"))
|
||
return -ENODEV;
|
||
|
||
RCU_INIT_POINTER(devdata, NULL);
|
||
new_devdata = kzalloc(sizeof(*new_devdata), GFP_KERNEL);
|
||
if (!new_devdata) {
|
||
pr_err("Could not allocate memory for device data\n");
|
||
return -ENOMEM;
|
||
}
|
||
new_devdata->status = UNAVAILABLE;
|
||
RCU_INIT_POINTER(devdata, new_devdata);
|
||
|
||
ret = vio_register_driver(&nx842_vio_driver);
|
||
if (ret) {
|
||
pr_err("Could not register VIO driver %d\n", ret);
|
||
|
||
kfree(new_devdata);
|
||
return ret;
|
||
}
|
||
|
||
if (!nx842_platform_driver_set(&nx842_pseries_driver)) {
|
||
vio_unregister_driver(&nx842_vio_driver);
|
||
kfree(new_devdata);
|
||
return -EEXIST;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
module_init(nx842_init);
|
||
|
||
static void __exit nx842_exit(void)
|
||
{
|
||
struct nx842_devdata *old_devdata;
|
||
unsigned long flags;
|
||
|
||
pr_info("Exiting IBM Power 842 compression driver\n");
|
||
nx842_platform_driver_unset(&nx842_pseries_driver);
|
||
spin_lock_irqsave(&devdata_mutex, flags);
|
||
old_devdata = rcu_dereference_check(devdata,
|
||
lockdep_is_held(&devdata_mutex));
|
||
RCU_INIT_POINTER(devdata, NULL);
|
||
spin_unlock_irqrestore(&devdata_mutex, flags);
|
||
synchronize_rcu();
|
||
if (old_devdata && old_devdata->dev)
|
||
dev_set_drvdata(old_devdata->dev, NULL);
|
||
kfree(old_devdata);
|
||
vio_unregister_driver(&nx842_vio_driver);
|
||
}
|
||
|
||
module_exit(nx842_exit);
|
||
|