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linuxdebug/drivers/crypto/nx/nx-common-pseries.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for IBM Power 842 compression accelerator
*
* 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 <asm/hvcall.h>
#include <asm/vas.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");
/*
* Coprocessor type specific capabilities from the hypervisor.
*/
struct hv_nx_cop_caps {
__be64 descriptor;
__be64 req_max_processed_len; /* Max bytes in one GZIP request */
__be64 min_compress_len; /* Min compression size in bytes */
__be64 min_decompress_len; /* Min decompression size in bytes */
} __packed __aligned(0x1000);
/*
* Coprocessor type specific capabilities.
*/
struct nx_cop_caps {
u64 descriptor;
u64 req_max_processed_len; /* Max bytes in one GZIP request */
u64 min_compress_len; /* Min compression in bytes */
u64 min_decompress_len; /* Min decompression in bytes */
};
static u64 caps_feat;
static struct nx_cop_caps nx_cop_caps;
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
* @wmem: 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;
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;
}
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
* @wmem: 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;
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;
}
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.
*
* @devdata: struct nx842_devdata to use for dev_info
* @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 nx842_devdata *devdata,
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(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
* @data: struct of_reconfig_data pointer
*
* 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, "%lld\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%lld\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%lld\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 const struct attribute_group nx842_attribute_group = {
.name = NULL, /* put in device directory */
.attrs = nx842_sysfs_entries,
};
#define nxcop_caps_read(_name) \
static ssize_t nxcop_##_name##_show(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
return sprintf(buf, "%lld\n", nx_cop_caps._name); \
}
#define NXCT_ATTR_RO(_name) \
nxcop_caps_read(_name); \
static struct device_attribute dev_attr_##_name = __ATTR(_name, \
0444, \
nxcop_##_name##_show, \
NULL);
NXCT_ATTR_RO(req_max_processed_len);
NXCT_ATTR_RO(min_compress_len);
NXCT_ATTR_RO(min_decompress_len);
static struct attribute *nxcop_caps_sysfs_entries[] = {
&dev_attr_req_max_processed_len.attr,
&dev_attr_min_compress_len.attr,
&dev_attr_min_decompress_len.attr,
NULL,
};
static const struct attribute_group nxcop_caps_attr_group = {
.name = "nx_gzip_caps",
.attrs = nxcop_caps_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;
}
if (caps_feat) {
if (sysfs_create_group(&viodev->dev.kobj,
&nxcop_caps_attr_group)) {
dev_err(&viodev->dev,
"Could not create sysfs NX capability entries\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 void 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);
if (caps_feat)
sysfs_remove_group(&viodev->dev.kobj, &nxcop_caps_attr_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);
}
/*
* Get NX capabilities from the hypervisor.
* Only NXGZIP capabilities are provided by the hypersvisor right
* now and these values are available to user space with sysfs.
*/
static void __init nxcop_get_capabilities(void)
{
struct hv_vas_all_caps *hv_caps;
struct hv_nx_cop_caps *hv_nxc;
int rc;
hv_caps = kmalloc(sizeof(*hv_caps), GFP_KERNEL);
if (!hv_caps)
return;
/*
* Get NX overall capabilities with feature type=0
*/
rc = h_query_vas_capabilities(H_QUERY_NX_CAPABILITIES, 0,
(u64)virt_to_phys(hv_caps));
if (rc)
goto out;
caps_feat = be64_to_cpu(hv_caps->feat_type);
/*
* NX-GZIP feature available
*/
if (caps_feat & VAS_NX_GZIP_FEAT_BIT) {
hv_nxc = kmalloc(sizeof(*hv_nxc), GFP_KERNEL);
if (!hv_nxc)
goto out;
/*
* Get capabilities for NX-GZIP feature
*/
rc = h_query_vas_capabilities(H_QUERY_NX_CAPABILITIES,
VAS_NX_GZIP_FEAT,
(u64)virt_to_phys(hv_nxc));
} else {
pr_err("NX-GZIP feature is not available\n");
rc = -EINVAL;
}
if (!rc) {
nx_cop_caps.descriptor = be64_to_cpu(hv_nxc->descriptor);
nx_cop_caps.req_max_processed_len =
be64_to_cpu(hv_nxc->req_max_processed_len);
nx_cop_caps.min_compress_len =
be64_to_cpu(hv_nxc->min_compress_len);
nx_cop_caps.min_decompress_len =
be64_to_cpu(hv_nxc->min_decompress_len);
} else {
caps_feat = 0;
}
kfree(hv_nxc);
out:
kfree(hv_caps);
}
static const struct vio_device_id nx842_vio_driver_ids[] = {
{"ibm,compression-v1", "ibm,compression"},
{"", ""},
};
MODULE_DEVICE_TABLE(vio, nx842_vio_driver_ids);
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;
struct device_node *np;
int ret;
np = of_find_compatible_node(NULL, NULL, "ibm,compression");
if (!np)
return -ENODEV;
of_node_put(np);
RCU_INIT_POINTER(devdata, NULL);
new_devdata = kzalloc(sizeof(*new_devdata), GFP_KERNEL);
if (!new_devdata)
return -ENOMEM;
RCU_INIT_POINTER(devdata, new_devdata);
/*
* Get NX capabilities from the hypervisor.
*/
nxcop_get_capabilities();
ret = vio_register_driver(&nx842_vio_driver);
if (ret) {
pr_err("Could not register VIO driver %d\n", ret);
kfree(new_devdata);
return ret;
}
ret = vas_register_api_pseries(THIS_MODULE, VAS_COP_TYPE_GZIP,
"nx-gzip");
if (ret)
pr_err("NX-GZIP is not supported. Returned=%d\n", ret);
return 0;
}
module_init(nx842_pseries_init);
static void __exit nx842_pseries_exit(void)
{
struct nx842_devdata *old_devdata;
unsigned long flags;
vas_unregister_api_pseries();
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);