linux-hardened/drivers/crypto/nx/nx-842-pseries.c
Haren Myneni ea0b3984c1 crypto: 842 - Add CRC and validation support
This patch adds CRC generation and validation support for nx-842.
Add CRC flag so that nx842 coprocessor includes CRC during compression
and validates during decompression.

Also changes in 842 SW compression to append CRC value at the end
of template and checks during decompression.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-10-14 22:23:17 +08:00

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/*
* Driver for IBM Power 842 compression accelerator
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright (C) IBM Corporation, 2012
*
* Authors: Robert Jennings <rcj@linux.vnet.ibm.com>
* Seth Jennings <sjenning@linux.vnet.ibm.com>
*/
#include <asm/vio.h>
#include "nx-842.h"
#include "nx_csbcpb.h" /* struct nx_csbcpb */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>");
MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
MODULE_ALIAS_CRYPTO("842");
MODULE_ALIAS_CRYPTO("842-nx");
static struct nx842_constraints nx842_pseries_constraints = {
.alignment = DDE_BUFFER_ALIGN,
.multiple = DDE_BUFFER_LAST_MULT,
.minimum = DDE_BUFFER_LAST_MULT,
.maximum = PAGE_SIZE, /* dynamic, max_sync_size */
};
static int check_constraints(unsigned long buf, unsigned int *len, bool in)
{
if (!IS_ALIGNED(buf, nx842_pseries_constraints.alignment)) {
pr_debug("%s buffer 0x%lx not aligned to 0x%x\n",
in ? "input" : "output", buf,
nx842_pseries_constraints.alignment);
return -EINVAL;
}
if (*len % nx842_pseries_constraints.multiple) {
pr_debug("%s buffer len 0x%x not multiple of 0x%x\n",
in ? "input" : "output", *len,
nx842_pseries_constraints.multiple);
if (in)
return -EINVAL;
*len = round_down(*len, nx842_pseries_constraints.multiple);
}
if (*len < nx842_pseries_constraints.minimum) {
pr_debug("%s buffer len 0x%x under minimum 0x%x\n",
in ? "input" : "output", *len,
nx842_pseries_constraints.minimum);
return -EINVAL;
}
if (*len > nx842_pseries_constraints.maximum) {
pr_debug("%s buffer len 0x%x over maximum 0x%x\n",
in ? "input" : "output", *len,
nx842_pseries_constraints.maximum);
if (in)
return -EINVAL;
*len = nx842_pseries_constraints.maximum;
}
return 0;
}
/* I assume we need to align the CSB? */
#define WORKMEM_ALIGN (256)
struct nx842_workmem {
/* scatterlist */
char slin[4096];
char slout[4096];
/* coprocessor status/parameter block */
struct nx_csbcpb csbcpb;
char padding[WORKMEM_ALIGN];
} __aligned(WORKMEM_ALIGN);
/* Macros for fields within nx_csbcpb */
/* Check the valid bit within the csbcpb valid field */
#define NX842_CSBCBP_VALID_CHK(x) (x & BIT_MASK(7))
/* CE macros operate on the completion_extension field bits in the csbcpb.
* CE0 0=full completion, 1=partial completion
* CE1 0=CE0 indicates completion, 1=termination (output may be modified)
* CE2 0=processed_bytes is source bytes, 1=processed_bytes is target bytes */
#define NX842_CSBCPB_CE0(x) (x & BIT_MASK(7))
#define NX842_CSBCPB_CE1(x) (x & BIT_MASK(6))
#define NX842_CSBCPB_CE2(x) (x & BIT_MASK(5))
/* The NX unit accepts data only on 4K page boundaries */
#define NX842_HW_PAGE_SIZE (4096)
#define NX842_HW_PAGE_MASK (~(NX842_HW_PAGE_SIZE-1))
struct ibm_nx842_counters {
atomic64_t comp_complete;
atomic64_t comp_failed;
atomic64_t decomp_complete;
atomic64_t decomp_failed;
atomic64_t swdecomp;
atomic64_t comp_times[32];
atomic64_t decomp_times[32];
};
static struct nx842_devdata {
struct vio_dev *vdev;
struct device *dev;
struct ibm_nx842_counters *counters;
unsigned int max_sg_len;
unsigned int max_sync_size;
unsigned int max_sync_sg;
} __rcu *devdata;
static DEFINE_SPINLOCK(devdata_mutex);
#define NX842_COUNTER_INC(_x) \
static inline void nx842_inc_##_x( \
const struct nx842_devdata *dev) { \
if (dev) \
atomic64_inc(&dev->counters->_x); \
}
NX842_COUNTER_INC(comp_complete);
NX842_COUNTER_INC(comp_failed);
NX842_COUNTER_INC(decomp_complete);
NX842_COUNTER_INC(decomp_failed);
NX842_COUNTER_INC(swdecomp);
#define NX842_HIST_SLOTS 16
static void ibm_nx842_incr_hist(atomic64_t *times, unsigned int time)
{
int bucket = fls(time);
if (bucket)
bucket = min((NX842_HIST_SLOTS - 1), bucket - 1);
atomic64_inc(&times[bucket]);
}
/* NX unit operation flags */
#define NX842_OP_COMPRESS 0x0
#define NX842_OP_CRC 0x1
#define NX842_OP_DECOMPRESS 0x2
#define NX842_OP_COMPRESS_CRC (NX842_OP_COMPRESS | NX842_OP_CRC)
#define NX842_OP_DECOMPRESS_CRC (NX842_OP_DECOMPRESS | NX842_OP_CRC)
#define NX842_OP_ASYNC (1<<23)
#define NX842_OP_NOTIFY (1<<22)
#define NX842_OP_NOTIFY_INT(x) ((x & 0xff)<<8)
static unsigned long nx842_get_desired_dma(struct vio_dev *viodev)
{
/* No use of DMA mappings within the driver. */
return 0;
}
struct nx842_slentry {
__be64 ptr; /* Real address (use __pa()) */
__be64 len;
};
/* pHyp scatterlist entry */
struct nx842_scatterlist {
int entry_nr; /* number of slentries */
struct nx842_slentry *entries; /* ptr to array of slentries */
};
/* Does not include sizeof(entry_nr) in the size */
static inline unsigned long nx842_get_scatterlist_size(
struct nx842_scatterlist *sl)
{
return sl->entry_nr * sizeof(struct nx842_slentry);
}
static int nx842_build_scatterlist(unsigned long buf, int len,
struct nx842_scatterlist *sl)
{
unsigned long entrylen;
struct nx842_slentry *entry;
sl->entry_nr = 0;
entry = sl->entries;
while (len) {
entry->ptr = cpu_to_be64(nx842_get_pa((void *)buf));
entrylen = min_t(int, len,
LEN_ON_SIZE(buf, NX842_HW_PAGE_SIZE));
entry->len = cpu_to_be64(entrylen);
len -= entrylen;
buf += entrylen;
sl->entry_nr++;
entry++;
}
return 0;
}
static int nx842_validate_result(struct device *dev,
struct cop_status_block *csb)
{
/* The csb must be valid after returning from vio_h_cop_sync */
if (!NX842_CSBCBP_VALID_CHK(csb->valid)) {
dev_err(dev, "%s: cspcbp not valid upon completion.\n",
__func__);
dev_dbg(dev, "valid:0x%02x cs:0x%02x cc:0x%02x ce:0x%02x\n",
csb->valid,
csb->crb_seq_number,
csb->completion_code,
csb->completion_extension);
dev_dbg(dev, "processed_bytes:%d address:0x%016lx\n",
be32_to_cpu(csb->processed_byte_count),
(unsigned long)be64_to_cpu(csb->address));
return -EIO;
}
/* Check return values from the hardware in the CSB */
switch (csb->completion_code) {
case 0: /* Completed without error */
break;
case 64: /* Compression ok, but output larger than input */
dev_dbg(dev, "%s: output size larger than input size\n",
__func__);
break;
case 13: /* Output buffer too small */
dev_dbg(dev, "%s: Out of space in output buffer\n",
__func__);
return -ENOSPC;
case 65: /* Calculated CRC doesn't match the passed value */
dev_dbg(dev, "%s: CRC mismatch for decompression\n",
__func__);
return -EINVAL;
case 66: /* Input data contains an illegal template field */
case 67: /* Template indicates data past the end of the input stream */
dev_dbg(dev, "%s: Bad data for decompression (code:%d)\n",
__func__, csb->completion_code);
return -EINVAL;
default:
dev_dbg(dev, "%s: Unspecified error (code:%d)\n",
__func__, csb->completion_code);
return -EIO;
}
/* Hardware sanity check */
if (!NX842_CSBCPB_CE2(csb->completion_extension)) {
dev_err(dev, "%s: No error returned by hardware, but "
"data returned is unusable, contact support.\n"
"(Additional info: csbcbp->processed bytes "
"does not specify processed bytes for the "
"target buffer.)\n", __func__);
return -EIO;
}
return 0;
}
/**
* nx842_pseries_compress - Compress data using the 842 algorithm
*
* Compression provide by the NX842 coprocessor on IBM Power 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: Pointer to input buffer
* @inlen: Length of input buffer
* @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
* -ENOMEM Unable to allocate internal buffers
* -ENOSPC Output buffer is to small
* -EIO Internal error
* -ENODEV Hardware unavailable
*/
static int nx842_pseries_compress(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();
inbuf = (unsigned long)in;
if (check_constraints(inbuf, &inlen, true))
return -EINVAL;
outbuf = (unsigned long)out;
if (check_constraints(outbuf, outlen, false))
return -EINVAL;
rcu_read_lock();
local_devdata = rcu_dereference(devdata);
if (!local_devdata || !local_devdata->dev) {
rcu_read_unlock();
return -ENODEV;
}
max_sync_size = local_devdata->max_sync_size;
dev = local_devdata->dev;
/* Init scatterlist */
workmem = PTR_ALIGN(wmem, WORKMEM_ALIGN);
slin.entries = (struct nx842_slentry *)workmem->slin;
slout.entries = (struct nx842_slentry *)workmem->slout;
/* Init operation */
op.flags = NX842_OP_COMPRESS_CRC;
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);
ret = -EIO;
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);
dev_dbg(dev, "%s: processed_bytes=%d\n", __func__, *outlen);
unlock:
if (ret)
nx842_inc_comp_failed(local_devdata);
else {
nx842_inc_comp_complete(local_devdata);
ibm_nx842_incr_hist(local_devdata->counters->comp_times,
(get_tb() - start) / tb_ticks_per_usec);
}
rcu_read_unlock();
return ret;
}
/**
* nx842_pseries_decompress - Decompress data using the 842 algorithm
*
* Decompression provide by the NX842 coprocessor on IBM Power systems.
* 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.
* If there is an error then @outlen will be 0 and an error will be
* specified by the return code from this function.
*
* @in: Pointer to input buffer
* @inlen: Length of input buffer
* @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))
return -EINVAL;
outbuf = (unsigned long)out;
if (check_constraints(outbuf, outlen, false))
return -EINVAL;
rcu_read_lock();
local_devdata = rcu_dereference(devdata);
if (!local_devdata || !local_devdata->dev) {
rcu_read_unlock();
return -ENODEV;
}
max_sync_size = local_devdata->max_sync_size;
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_CRC;
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;
return 0;
} else
return -ENOENT;
}
/**
* nx842_OF_upd_status -- Check 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.
*
* @prop - struct property point containing the maxsyncop for the update
*
* Returns:
* 0 - Device is available
* -ENODEV - Device is not available
*/
static int nx842_OF_upd_status(struct property *prop)
{
const char *status = (const char *)prop->value;
if (!strncmp(status, "okay", (size_t)prop->length))
return 0;
if (!strncmp(status, "disabled", (size_t)prop->length))
return -ENODEV;
dev_info(devdata->dev, "%s: unknown status '%s'\n", __func__, status);
return -EINVAL;
}
/**
* 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;
new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS);
if (!new_devdata)
return -ENOMEM;
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);
kfree(new_devdata);
return -ENODEV;
}
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(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(&times[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(&times[(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 nx842_pseries_crypto_init(struct crypto_tfm *tfm)
{
return nx842_crypto_init(tfm, &nx842_pseries_driver);
}
static struct crypto_alg nx842_pseries_alg = {
.cra_name = "842",
.cra_driver_name = "842-nx",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
.cra_ctxsize = sizeof(struct nx842_crypto_ctx),
.cra_module = THIS_MODULE,
.cra_init = nx842_pseries_crypto_init,
.cra_exit = nx842_crypto_exit,
.cra_u = { .compress = {
.coa_compress = nx842_crypto_compress,
.coa_decompress = nx842_crypto_decompress } }
};
static int 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;
new_devdata = kzalloc(sizeof(*new_devdata), GFP_NOFS);
if (!new_devdata)
return -ENOMEM;
new_devdata->counters = kzalloc(sizeof(*new_devdata->counters),
GFP_NOFS);
if (!new_devdata->counters) {
kfree(new_devdata);
return -ENOMEM;
}
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->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)
goto error;
ret = crypto_register_alg(&nx842_pseries_alg);
if (ret) {
dev_err(&viodev->dev, "could not register comp alg: %d\n", ret);
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 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);
crypto_unregister_alg(&nx842_pseries_alg);
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 = nx842_remove,
.get_desired_dma = nx842_get_desired_dma,
.id_table = nx842_vio_driver_ids,
};
static int __init nx842_pseries_init(void)
{
struct nx842_devdata *new_devdata;
int ret;
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;
}
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;
}
return 0;
}
module_init(nx842_pseries_init);
static void __exit nx842_pseries_exit(void)
{
struct nx842_devdata *old_devdata;
unsigned long flags;
crypto_unregister_alg(&nx842_pseries_alg);
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_pseries_exit);