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-rw-r--r--MAINTAINERS6
-rw-r--r--drivers/crypto/nx/Kconfig9
-rw-r--r--drivers/crypto/nx/Makefile3
-rw-r--r--drivers/crypto/nx/nx-842.c1615
-rw-r--r--include/linux/nx842.h11
5 files changed, 1644 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 6720018bc67..f2dfb204c8e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3415,6 +3415,12 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git
S: Maintained
F: arch/ia64/
+IBM Power 842 compression accelerator
+M: Robert Jennings <rcj@linux.vnet.ibm.com>
+S: Supported
+F: drivers/crypto/nx/nx-842.c
+F: include/linux/nx842.h
+
IBM Power Linux RAID adapter
M: Brian King <brking@us.ibm.com>
S: Supported
diff --git a/drivers/crypto/nx/Kconfig b/drivers/crypto/nx/Kconfig
index dedde535024..f82616621ae 100644
--- a/drivers/crypto/nx/Kconfig
+++ b/drivers/crypto/nx/Kconfig
@@ -15,3 +15,12 @@ config CRYPTO_DEV_NX_ENCRYPT
Support for Power7+ in-Nest encryption acceleration. This
module supports acceleration for AES and SHA2 algorithms. If you
choose 'M' here, this module will be called nx_crypto.
+
+config CRYPTO_DEV_NX_COMPRESS
+ tristate "Compression acceleration support"
+ depends on PPC64 && IBMVIO
+ default y
+ help
+ Support for Power7+ in-Nest compression acceleration. This
+ module supports acceleration for AES and SHA2 algorithms. If you
+ choose 'M' here, this module will be called nx_compress.
diff --git a/drivers/crypto/nx/Makefile b/drivers/crypto/nx/Makefile
index 7f110e460da..bb770ea45ce 100644
--- a/drivers/crypto/nx/Makefile
+++ b/drivers/crypto/nx/Makefile
@@ -9,3 +9,6 @@ nx-crypto-objs := nx.o \
nx-aes-xcbc.o \
nx-sha256.o \
nx-sha512.o
+
+obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS) += nx-compress.o
+nx-compress-objs := nx-842.o
diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c
new file mode 100644
index 00000000000..9da0fb2d3f6
--- /dev/null
+++ b/drivers/crypto/nx/nx-842.c
@@ -0,0 +1,1615 @@
+/*
+ * 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 <linux/module.h>
+#include <asm/vio.h>
+#include <asm/pSeries_reconfig.h>
+#include <linux/slab.h>
+#include <asm/abs_addr.h>
+#include <linux/nx842.h>
+#include <linux/kernel.h>
+
+#include "nx_csbcpb.h" /* struct nx_csbcpb */
+
+#define MODULE_NAME "nx-compress"
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Robert Jennings <rcj@linux.vnet.ibm.com>");
+MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors");
+
+#define SHIFT_4K 12
+#define SHIFT_64K 16
+#define SIZE_4K (1UL << SHIFT_4K)
+#define SIZE_64K (1UL << SHIFT_64K)
+
+/* IO buffer must be 128 byte aligned */
+#define IO_BUFFER_ALIGN 128
+
+struct nx842_header {
+ int blocks_nr; /* number of compressed blocks */
+ int offset; /* offset of the first block (from beginning of header) */
+ int sizes[0]; /* size of compressed blocks */
+};
+
+static inline int nx842_header_size(const struct nx842_header *hdr)
+{
+ return sizeof(struct nx842_header) +
+ hdr->blocks_nr * sizeof(hdr->sizes[0]);
+}
+
+/* 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_SHIFT SHIFT_4K
+#define NX842_HW_PAGE_SIZE (ASM_CONST(1) << NX842_HW_PAGE_SHIFT)
+#define NX842_HW_PAGE_MASK (~(NX842_HW_PAGE_SIZE-1))
+
+enum nx842_status {
+ UNAVAILABLE,
+ AVAILABLE
+};
+
+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;
+ enum nx842_status status;
+} __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 {
+ unsigned long ptr; /* Absolute address (use virt_to_abs()) */
+ unsigned long 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 nextpage;
+ struct nx842_slentry *entry;
+
+ sl->entry_nr = 0;
+
+ entry = sl->entries;
+ while (len) {
+ entry->ptr = virt_to_abs(buf);
+ nextpage = ALIGN(buf + 1, NX842_HW_PAGE_SIZE);
+ if (nextpage < buf + len) {
+ /* we aren't at the end yet */
+ if (IS_ALIGNED(buf, NX842_HW_PAGE_SIZE))
+ /* we are in the middle (or beginning) */
+ entry->len = NX842_HW_PAGE_SIZE;
+ else
+ /* we are at the beginning */
+ entry->len = nextpage - buf;
+ } else {
+ /* at the end */
+ entry->len = len;
+ }
+
+ len -= entry->len;
+ buf += entry->len;
+ sl->entry_nr++;
+ entry++;
+ }
+
+ return 0;
+}
+
+/*
+ * Working memory for software decompression
+ */
+struct sw842_fifo {
+ union {
+ char f8[256][8];
+ char f4[512][4];
+ };
+ char f2[256][2];
+ unsigned char f84_full;
+ unsigned char f2_full;
+ unsigned char f8_count;
+ unsigned char f2_count;
+ unsigned int f4_count;
+};
+
+/*
+ * Working memory for crypto API
+ */
+struct nx842_workmem {
+ char bounce[PAGE_SIZE]; /* bounce buffer for decompression input */
+ union {
+ /* hardware working memory */
+ struct {
+ /* scatterlist */
+ char slin[SIZE_4K];
+ char slout[SIZE_4K];
+ /* coprocessor status/parameter block */
+ struct nx_csbcpb csbcpb;
+ };
+ /* software working memory */
+ struct sw842_fifo swfifo; /* software decompression fifo */
+ };
+};
+
+int nx842_get_workmem_size(void)
+{
+ return sizeof(struct nx842_workmem) + NX842_HW_PAGE_SIZE;
+}
+EXPORT_SYMBOL_GPL(nx842_get_workmem_size);
+
+int nx842_get_workmem_size_aligned(void)
+{
+ return sizeof(struct nx842_workmem);
+}
+EXPORT_SYMBOL_GPL(nx842_get_workmem_size_aligned);
+
+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",
+ csb->processed_byte_count,
+ (unsigned long)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: /* Target bytes > Source bytes during compression */
+ case 13: /* Output buffer too small */
+ dev_dbg(dev, "%s: Compression output larger than input\n",
+ __func__);
+ return -ENOSPC;
+ 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_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, must be page aligned
+ * @inlen: Length of input buffer, must be PAGE_SIZE
+ * @out: Pointer to output buffer
+ * @outlen: Length of output buffer
+ * @wrkmem: ptr to buffer for working memory, size determined by
+ * nx842_get_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
+ * -EMSGSIZE XXX Difficult to describe this limitation
+ * -EIO Internal error
+ * -ENODEV Hardware unavailable
+ */
+int nx842_compress(const unsigned char *in, unsigned int inlen,
+ unsigned char *out, unsigned int *outlen, void *wmem)
+{
+ struct nx842_header *hdr;
+ 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, i, bytesleft, size, hdrsize;
+ unsigned long inbuf, outbuf, padding;
+ struct vio_pfo_op op = {
+ .done = NULL,
+ .handle = 0,
+ .timeout = 0,
+ };
+ unsigned long start_time = get_tb();
+
+ /*
+ * Make sure input buffer is 64k page aligned. This is assumed since
+ * this driver is designed for page compression only (for now). This
+ * is very nice since we can now use direct DDE(s) for the input and
+ * the alignment is guaranteed.
+ */
+ inbuf = (unsigned long)in;
+ if (!IS_ALIGNED(inbuf, PAGE_SIZE) || inlen != PAGE_SIZE)
+ 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;
+
+ /* Create the header */
+ hdr = (struct nx842_header *)out;
+ hdr->blocks_nr = PAGE_SIZE / max_sync_size;
+ hdrsize = nx842_header_size(hdr);
+ outbuf = (unsigned long)out + hdrsize;
+ bytesleft = *outlen - hdrsize;
+
+ /* Init scatterlist */
+ workmem = (struct nx842_workmem *)ALIGN((unsigned long)wmem,
+ NX842_HW_PAGE_SIZE);
+ slin.entries = (struct nx842_slentry *)workmem->slin;
+ slout.entries = (struct nx842_slentry *)workmem->slout;
+
+ /* Init operation */
+ op.flags = NX842_OP_COMPRESS;
+ csbcpb = &workmem->csbcpb;
+ memset(csbcpb, 0, sizeof(*csbcpb));
+ op.csbcpb = virt_to_abs(csbcpb);
+ op.out = virt_to_abs(slout.entries);
+
+ for (i = 0; i < hdr->blocks_nr; i++) {
+ /*
+ * Aligning the output blocks to 128 bytes does waste space,
+ * but it prevents the need for bounce buffers and memory
+ * copies. It also simplifies the code a lot. In the worst
+ * case (64k page, 4k max_sync_size), you lose up to
+ * (128*16)/64k = ~3% the compression factor. For 64k
+ * max_sync_size, the loss would be at most 128/64k = ~0.2%.
+ */
+ padding = ALIGN(outbuf, IO_BUFFER_ALIGN) - outbuf;
+ outbuf += padding;
+ bytesleft -= padding;
+ if (i == 0)
+ /* save offset into first block in header */
+ hdr->offset = padding + hdrsize;
+
+ if (bytesleft <= 0) {
+ ret = -ENOSPC;
+ goto unlock;
+ }
+
+ /*
+ * NOTE: If the default max_sync_size is changed from 4k
+ * to 64k, remove the "likely" case below, since a
+ * scatterlist will always be needed.
+ */
+ if (likely(max_sync_size == NX842_HW_PAGE_SIZE)) {
+ /* Create direct DDE */
+ op.in = virt_to_abs(inbuf);
+ op.inlen = max_sync_size;
+
+ } else {
+ /* Create indirect DDE (scatterlist) */
+ nx842_build_scatterlist(inbuf, max_sync_size, &slin);
+ op.in = virt_to_abs(slin.entries);
+ op.inlen = -nx842_get_scatterlist_size(&slin);
+ }
+
+ /*
+ * If max_sync_size != NX842_HW_PAGE_SIZE, an indirect
+ * DDE is required for the outbuf.
+ * If max_sync_size == NX842_HW_PAGE_SIZE, outbuf must
+ * also be page aligned (1 in 128/4k=32 chance) in order
+ * to use a direct DDE.
+ * This is unlikely, just use an indirect DDE always.
+ */
+ nx842_build_scatterlist(outbuf,
+ min(bytesleft, max_sync_size), &slout);
+ /* op.out set before loop */
+ op.outlen = -nx842_get_scatterlist_size(&slout);
+
+ /* 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 && ret != -ENOSPC)
+ goto unlock;
+
+ /* Handle incompressible data */
+ if (unlikely(ret == -ENOSPC)) {
+ if (bytesleft < max_sync_size) {
+ /*
+ * Not enough space left in the output buffer
+ * to store uncompressed block
+ */
+ goto unlock;
+ } else {
+ /* Store incompressible block */
+ memcpy((void *)outbuf, (void *)inbuf,
+ max_sync_size);
+ hdr->sizes[i] = -max_sync_size;
+ outbuf += max_sync_size;
+ bytesleft -= max_sync_size;
+ /* Reset ret, incompressible data handled */
+ ret = 0;
+ }
+ } else {
+ /* Normal case, compression was successful */
+ size = csbcpb->csb.processed_byte_count;
+ dev_dbg(dev, "%s: processed_bytes=%d\n",
+ __func__, size);
+ hdr->sizes[i] = size;
+ outbuf += size;
+ bytesleft -= size;
+ }
+
+ inbuf += max_sync_size;
+ }
+
+ *outlen = (unsigned int)(outbuf - (unsigned long)out);
+
+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_time) / tb_ticks_per_usec);
+ }
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nx842_compress);
+
+static int sw842_decompress(const unsigned char *, int, unsigned char *, int *,
+ const void *);
+
+/**
+ * nx842_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, will use bounce buffer if not 128 byte
+ * aligned
+ * @inlen: Length of input buffer
+ * @out: Pointer to output buffer, must be page aligned
+ * @outlen: Length of output buffer, must be PAGE_SIZE
+ * @wrkmem: ptr to buffer for working memory, size determined by
+ * nx842_get_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
+ */
+int nx842_decompress(const unsigned char *in, unsigned int inlen,
+ unsigned char *out, unsigned int *outlen, void *wmem)
+{
+ struct nx842_header *hdr;
+ 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, i, size, max_sync_size;
+ unsigned long inbuf, outbuf;
+ struct vio_pfo_op op = {
+ .done = NULL,
+ .handle = 0,
+ .timeout = 0,
+ };
+ unsigned long start_time = get_tb();
+
+ /* Ensure page alignment and size */
+ outbuf = (unsigned long)out;
+ if (!IS_ALIGNED(outbuf, PAGE_SIZE) || *outlen != PAGE_SIZE)
+ return -EINVAL;
+
+ rcu_read_lock();
+ local_devdata = rcu_dereference(devdata);
+ if (local_devdata)
+ dev = local_devdata->dev;
+
+ /* Get header */
+ hdr = (struct nx842_header *)in;
+
+ workmem = (struct nx842_workmem *)ALIGN((unsigned long)wmem,
+ NX842_HW_PAGE_SIZE);
+
+ inbuf = (unsigned long)in + hdr->offset;
+ if (likely(!IS_ALIGNED(inbuf, IO_BUFFER_ALIGN))) {
+ /* Copy block(s) into bounce buffer for alignment */
+ memcpy(workmem->bounce, in + hdr->offset, inlen - hdr->offset);
+ inbuf = (unsigned long)workmem->bounce;
+ }
+
+ /* 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 = virt_to_abs(csbcpb);
+
+ /*
+ * max_sync_size may have changed since compression,
+ * so we can't read it from the device info. We need
+ * to derive it from hdr->blocks_nr.
+ */
+ max_sync_size = PAGE_SIZE / hdr->blocks_nr;
+
+ for (i = 0; i < hdr->blocks_nr; i++) {
+ /* Skip padding */
+ inbuf = ALIGN(inbuf, IO_BUFFER_ALIGN);
+
+ if (hdr->sizes[i] < 0) {
+ /* Negative sizes indicate uncompressed data blocks */
+ size = abs(hdr->sizes[i]);
+ memcpy((void *)outbuf, (void *)inbuf, size);
+ outbuf += size;
+ inbuf += size;
+ continue;
+ }
+
+ if (!dev)
+ goto sw;
+
+ /*
+ * The better the compression, the more likely the "likely"
+ * case becomes.
+ */
+ if (likely((inbuf & NX842_HW_PAGE_MASK) ==
+ ((inbuf + hdr->sizes[i] - 1) & NX842_HW_PAGE_MASK))) {
+ /* Create direct DDE */
+ op.in = virt_to_abs(inbuf);
+ op.inlen = hdr->sizes[i];
+ } else {
+ /* Create indirect DDE (scatterlist) */
+ nx842_build_scatterlist(inbuf, hdr->sizes[i] , &slin);
+ op.in = virt_to_abs(slin.entries);
+ op.inlen = -nx842_get_scatterlist_size(&slin);
+ }
+
+ /*
+ * NOTE: If the default max_sync_size is changed from 4k
+ * to 64k, remove the "likely" case below, since a
+ * scatterlist will always be needed.
+ */
+ if (likely(max_sync_size == NX842_HW_PAGE_SIZE)) {
+ /* Create direct DDE */
+ op.out = virt_to_abs(outbuf);
+ op.outlen = max_sync_size;
+ } else {
+ /* Create indirect DDE (scatterlist) */
+ nx842_build_scatterlist(outbuf, max_sync_size, &slout);
+ op.out = virt_to_abs(slout.entries);
+ op.outlen = -nx842_get_scatterlist_size(&slout);
+ }
+
+ /* 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);
+ dev = NULL;
+ goto sw;
+ }
+
+ /* Check for hardware error */
+ ret = nx842_validate_result(dev, &csbcpb->csb);
+ if (ret) {
+ dev = NULL;
+ goto sw;
+ }
+
+ /* HW decompression success */
+ inbuf += hdr->sizes[i];
+ outbuf += csbcpb->csb.processed_byte_count;
+ continue;
+
+sw:
+ /* software decompression */
+ size = max_sync_size;
+ ret = sw842_decompress(
+ (unsigned char *)inbuf, hdr->sizes[i],
+ (unsigned char *)outbuf, &size, wmem);
+ if (ret)
+ pr_debug("%s: sw842_decompress failed with %d\n",
+ __func__, ret);
+
+ if (ret) {
+ if (ret != -ENOSPC && ret != -EINVAL &&
+ ret != -EMSGSIZE)
+ ret = -EIO;
+ goto unlock;
+ }
+
+ /* SW decompression success */
+ inbuf += hdr->sizes[i];
+ outbuf += size;
+ }
+
+ *outlen = (unsigned int)(outbuf - (unsigned long)out);
+
+unlock:
+ if (ret)
+ /* decompress fail */
+ nx842_inc_decomp_failed(local_devdata);
+ else {
+ if (!dev)
+ /* software decompress */
+ nx842_inc_swdecomp(local_devdata);
+ nx842_inc_decomp_complete(local_devdata);
+ ibm_nx842_incr_hist(local_devdata->counters->decomp_times,
+ (get_tb() - start_time) / tb_ticks_per_usec);
+ }
+
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nx842_decompress);
+
+/**
+ * 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 int *maxsglen = prop->value;
+
+ 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 = (unsigned int)min(*maxsglen,
+ (int)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;
+ const struct maxsynccop_t {
+ int comp_elements;
+ int comp_data_limit;
+ int comp_sg_limit;
+ int decomp_elements;
+ int decomp_data_limit;
+ int 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;
+
+ /* 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 =
+ (unsigned int)min(maxsynccop->comp_data_limit,
+ maxsynccop->decomp_data_limit);
+
+ devdata->max_sync_size = min_t(unsigned int, devdata->max_sync_size,
+ SIZE_64K);
+
+ if (devdata->max_sync_size < SIZE_4K) {
+ 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;
+ }
+
+ devdata->max_sync_sg = (unsigned int)min(maxsynccop->comp_sg_limit,
+ maxsynccop->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;
+ }
+
+ /* Set ptr to new property if provided */
+ if (new_prop) {
+ /* Single property */
+ if (!strncmp(new_prop->name, "status", new_prop->length)) {
+ status = new_prop;
+
+ } else if (!strncmp(new_prop->name, "ibm,max-sg-len",
+ new_prop->length)) {
+ maxsglen = new_prop;
+
+ } else if (!strncmp(new_prop->name, "ibm,max-sync-cop",
+ new_prop->length)) {
+ maxsyncop = new_prop;
+
+ } else {
+ /*
+ * Skip the update, the property being updated
+ * has no impact.
+ */
+ 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 *update)
+{
+ struct pSeries_reconfig_prop_update *upd;
+ struct nx842_devdata *local_devdata;
+ struct device_node *node = NULL;
+
+ upd = (struct pSeries_reconfig_prop_update *)update;
+
+ rcu_read_lock();
+ local_devdata = rcu_dereference(devdata);
+ if (local_devdata)
+ node = local_devdata->dev->of_node;
+
+ if (local_devdata &&
+ action == PSERIES_UPDATE_PROPERTY &&
+ !strcmp(upd->node->name, node->name)) {
+ rcu_read_unlock();
+ nx842_OF_upd(upd->property);
+ } 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 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);
+
+ pSeries_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();
+ if (dev_set_drvdata(&viodev->dev, rcu_dereference(devdata))) {
+ rcu_read_unlock();
+ dev_err(&viodev->dev, "failed to set driver data for device\n");
+ ret = -1;
+ goto error;
+ }
+ 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));
+ pSeries_reconfig_notifier_unregister(&nx842_of_nb);
+ rcu_assign_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_driver_ids[] = {
+ {"ibm,compression-v1", "ibm,compression"},
+ {"", ""},
+};
+
+static struct vio_driver nx842_driver = {
+ .name = MODULE_NAME,
+ .probe = nx842_probe,
+ .remove = nx842_remove,
+ .get_desired_dma = nx842_get_desired_dma,
+ .id_table = nx842_driver_ids,
+};
+
+static int __init nx842_init(void)
+{
+ struct nx842_devdata *new_devdata;
+ pr_info("Registering IBM Power 842 compression driver\n");
+
+ 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);
+
+ return vio_register_driver(&nx842_driver);
+}
+
+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");
+ spin_lock_irqsave(&devdata_mutex, flags);
+ old_devdata = rcu_dereference_check(devdata,
+ lockdep_is_held(&devdata_mutex));
+ rcu_assign_pointer(devdata, NULL);
+ spin_unlock_irqrestore(&devdata_mutex, flags);
+ synchronize_rcu();
+ if (old_devdata)
+ dev_set_drvdata(old_devdata->dev, NULL);
+ kfree(old_devdata);
+ vio_unregister_driver(&nx842_driver);
+}
+
+module_exit(nx842_exit);
+
+/*********************************
+ * 842 software decompressor
+*********************************/
+typedef int (*sw842_template_op)(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+
+static int sw842_data8(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+static int sw842_data4(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+static int sw842_data2(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+static int sw842_ptr8(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+static int sw842_ptr4(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+static int sw842_ptr2(const char **, int *, unsigned char **,
+ struct sw842_fifo *);
+
+/* special templates */
+#define SW842_TMPL_REPEAT 0x1B
+#define SW842_TMPL_ZEROS 0x1C
+#define SW842_TMPL_EOF 0x1E
+
+static sw842_template_op sw842_tmpl_ops[26][4] = {
+ { sw842_data8, NULL}, /* 0 (00000) */
+ { sw842_data4, sw842_data2, sw842_ptr2, NULL},
+ { sw842_data4, sw842_ptr2, sw842_data2, NULL},
+ { sw842_data4, sw842_ptr2, sw842_ptr2, NULL},
+ { sw842_data4, sw842_ptr4, NULL},
+ { sw842_data2, sw842_ptr2, sw842_data4, NULL},
+ { sw842_data2, sw842_ptr2, sw842_data2, sw842_ptr2},
+ { sw842_data2, sw842_ptr2, sw842_ptr2, sw842_data2},
+ { sw842_data2, sw842_ptr2, sw842_ptr2, sw842_ptr2,},
+ { sw842_data2, sw842_ptr2, sw842_ptr4, NULL},
+ { sw842_ptr2, sw842_data2, sw842_data4, NULL}, /* 10 (01010) */
+ { sw842_ptr2, sw842_data4, sw842_ptr2, NULL},
+ { sw842_ptr2, sw842_data2, sw842_ptr2, sw842_data2},
+ { sw842_ptr2, sw842_data2, sw842_ptr2, sw842_ptr2},
+ { sw842_ptr2, sw842_data2, sw842_ptr4, NULL},
+ { sw842_ptr2, sw842_ptr2, sw842_data4, NULL},
+ { sw842_ptr2, sw842_ptr2, sw842_data2, sw842_ptr2},
+ { sw842_ptr2, sw842_ptr2, sw842_ptr2, sw842_data2},
+ { sw842_ptr2, sw842_ptr2, sw842_ptr2, sw842_ptr2},
+ { sw842_ptr2, sw842_ptr2, sw842_ptr4, NULL},
+ { sw842_ptr4, sw842_data4, NULL}, /* 20 (10100) */
+ { sw842_ptr4, sw842_data2, sw842_ptr2, NULL},
+ { sw842_ptr4, sw842_ptr2, sw842_data2, NULL},
+ { sw842_ptr4, sw842_ptr2, sw842_ptr2, NULL},
+ { sw842_ptr4, sw842_ptr4, NULL},
+ { sw842_ptr8, NULL}
+};
+
+/* Software decompress helpers */
+
+static uint8_t sw842_get_byte(const char *buf, int bit)
+{
+ uint8_t tmpl;
+ uint16_t tmp;
+ tmp = htons(*(uint16_t *)(buf));
+ tmp = (uint16_t)(tmp << bit);
+ tmp = ntohs(tmp);
+ memcpy(&tmpl, &tmp, 1);
+ return tmpl;
+}
+
+static uint8_t sw842_get_template(const char **buf, int *bit)
+{
+ uint8_t byte;
+ byte = sw842_get_byte(*buf, *bit);
+ byte = byte >> 3;
+ byte &= 0x1F;
+ *buf += (*bit + 5) / 8;
+ *bit = (*bit + 5) % 8;
+ return byte;
+}
+
+/* repeat_count happens to be 5-bit too (like the template) */
+static uint8_t sw842_get_repeat_count(const char **buf, int *bit)
+{
+ uint8_t byte;
+ byte = sw842_get_byte(*buf, *bit);
+ byte = byte >> 2;
+ byte &= 0x3F;
+ *buf += (*bit + 6) / 8;
+ *bit = (*bit + 6) % 8;
+ return byte;
+}
+
+static uint8_t sw842_get_ptr2(const char **buf, int *bit)
+{
+ uint8_t ptr;
+ ptr = sw842_get_byte(*buf, *bit);
+ (*buf)++;
+ return ptr;
+}
+
+static uint16_t sw842_get_ptr4(const char **buf, int *bit,
+ struct sw842_fifo *fifo)
+{
+ uint16_t ptr;
+ ptr = htons(*(uint16_t *)(*buf));
+ ptr = (uint16_t)(ptr << *bit);
+ ptr = ptr >> 7;
+ ptr &= 0x01FF;
+ *buf += (*bit + 9) / 8;
+ *bit = (*bit + 9) % 8;
+ return ptr;
+}
+
+static uint8_t sw842_get_ptr8(const char **buf, int *bit,
+ struct sw842_fifo *fifo)
+{
+ return sw842_get_ptr2(buf, bit);
+}
+
+/* Software decompress template ops */
+
+static int sw842_data8(const char **inbuf, int *inbit,
+ unsigned char **outbuf, struct sw842_fifo *fifo)
+{
+ int ret;
+
+ ret = sw842_data4(inbuf, inbit, outbuf, fifo);
+ if (ret)
+ return ret;
+ ret = sw842_data4(inbuf, inbit, outbuf, fifo);
+ return ret;
+}
+
+static int sw842_data4(const char **inbuf, int *inbit,
+ unsigned char **outbuf, struct sw842_fifo *fifo)
+{
+ int ret;
+
+ ret = sw842_data2(inbuf, inbit, outbuf, fifo);
+ if (ret)
+ return ret;
+ ret = sw842_data2(inbuf, inbit, outbuf, fifo);
+ return ret;
+}
+
+static int sw842_data2(const char **inbuf, int *inbit,
+ unsigned char **outbuf, struct sw842_fifo *fifo)
+{
+ **outbuf = sw842_get_byte(*inbuf, *inbit);
+ (*inbuf)++;
+ (*outbuf)++;
+ **outbuf = sw842_get_byte(*inbuf, *inbit);
+ (*inbuf)++;
+ (*outbuf)++;
+ return 0;
+}
+
+static int sw842_ptr8(const char **inbuf, int *inbit,
+ unsigned char **outbuf, struct sw842_fifo *fifo)
+{
+ uint8_t ptr;
+ ptr = sw842_get_ptr8(inbuf, inbit, fifo);
+ if (!fifo->f84_full && (ptr >= fifo->f8_count))
+ return 1;
+ memcpy(*outbuf, fifo->f8[ptr], 8);
+ *outbuf += 8;
+ return 0;
+}
+
+static int sw842_ptr4(const char **inbuf, int *inbit,
+ unsigned char **outbuf, struct sw842_fifo *fifo)
+{
+ uint16_t ptr;
+ ptr = sw842_get_ptr4(inbuf, inbit, fifo);
+ if (!fifo->f84_full && (ptr >= fifo->f4_count))
+ return 1;
+ memcpy(*outbuf, fifo->f4[ptr], 4);
+ *outbuf += 4;
+ return 0;
+}
+
+static int sw842_ptr2(const char **inbuf, int *inbit,
+ unsigned char **outbuf, struct sw842_fifo *fifo)
+{
+ uint8_t ptr;
+ ptr = sw842_get_ptr2(inbuf, inbit);
+ if (!fifo->f2_full && (ptr >= fifo->f2_count))
+ return 1;
+ memcpy(*outbuf, fifo->f2[ptr], 2);
+ *outbuf += 2;
+ return 0;
+}
+
+static void sw842_copy_to_fifo(const char *buf, struct sw842_fifo *fifo)
+{
+ unsigned char initial_f2count = fifo->f2_count;
+
+ memcpy(fifo->f8[fifo->f8_count], buf, 8);
+ fifo->f4_count += 2;
+ fifo->f8_count += 1;
+
+ if (!fifo->f84_full && fifo->f4_count >= 512) {
+ fifo->f84_full = 1;
+ fifo->f4_count /= 512;
+ }
+
+ memcpy(fifo->f2[fifo->f2_count++], buf, 2);
+ memcpy(fifo->f2[fifo->f2_count++], buf + 2, 2);
+ memcpy(fifo->f2[fifo->f2_count++], buf + 4, 2);
+ memcpy(fifo->f2[fifo->f2_count++], buf + 6, 2);
+ if (fifo->f2_count < initial_f2count)
+ fifo->f2_full = 1;
+}
+
+static int sw842_decompress(const unsigned char *src, int srclen,
+ unsigned char *dst, int *destlen,
+ const void *wrkmem)
+{
+ uint8_t tmpl;
+ const char *inbuf;
+ int inbit = 0;
+ unsigned char *outbuf, *outbuf_end, *origbuf, *prevbuf;
+ const char *inbuf_end;
+ sw842_template_op op;
+ int opindex;
+ int i, repeat_count;
+ struct sw842_fifo *fifo;
+ int ret = 0;
+
+ fifo = &((struct nx842_workmem *)(wrkmem))->swfifo;
+ memset(fifo, 0, sizeof(*fifo));
+
+ origbuf = NULL;
+ inbuf = src;
+ inbuf_end = src + srclen;
+ outbuf = dst;
+ outbuf_end = dst + *destlen;
+
+ while ((tmpl = sw842_get_template(&inbuf, &inbit)) != SW842_TMPL_EOF) {
+ if (inbuf >= inbuf_end) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ opindex = 0;
+ prevbuf = origbuf;
+ origbuf = outbuf;
+ switch (tmpl) {
+ case SW842_TMPL_REPEAT:
+ if (prevbuf == NULL) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ repeat_count = sw842_get_repeat_count(&inbuf,
+ &inbit) + 1;
+
+ /* Did the repeat count advance past the end of input */
+ if (inbuf > inbuf_end) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ for (i = 0; i < repeat_count; i++) {
+ /* Would this overflow the output buffer */
+ if ((outbuf + 8) > outbuf_end) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ memcpy(outbuf, prevbuf, 8);
+ sw842_copy_to_fifo(outbuf, fifo);
+ outbuf += 8;
+ }
+ break;
+
+ case SW842_TMPL_ZEROS:
+ /* Would this overflow the output buffer */
+ if ((outbuf + 8) > outbuf_end) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ memset(outbuf, 0, 8);
+ sw842_copy_to_fifo(outbuf, fifo);
+ outbuf += 8;
+ break;
+
+ default:
+ if (tmpl > 25) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Does this go past the end of the input buffer */
+ if ((inbuf + 2) > inbuf_end) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* Would this overflow the output buffer */
+ if ((outbuf + 8) > outbuf_end) {
+ ret = -ENOSPC;
+ goto out;
+ }
+
+ while (opindex < 4 &&
+ (op = sw842_tmpl_ops[tmpl][opindex++])
+ != NULL) {
+ ret = (*op)(&inbuf, &inbit, &outbuf, fifo);
+ if (ret) {
+ ret = -EINVAL;
+ goto out;
+ }
+ sw842_copy_to_fifo(origbuf, fifo);
+ }
+ }
+ }
+
+out:
+ if (!ret)
+ *destlen = (unsigned int)(outbuf - dst);
+ else
+ *destlen = 0;
+
+ return ret;
+}
diff --git a/include/linux/nx842.h b/include/linux/nx842.h
new file mode 100644
index 00000000000..a4d324c6406
--- /dev/null
+++ b/include/linux/nx842.h
@@ -0,0 +1,11 @@
+#ifndef __NX842_H__
+#define __NX842_H__
+
+int nx842_get_workmem_size(void);
+int nx842_get_workmem_size_aligned(void);
+int nx842_compress(const unsigned char *in, unsigned int in_len,
+ unsigned char *out, unsigned int *out_len, void *wrkmem);
+int nx842_decompress(const unsigned char *in, unsigned int in_len,
+ unsigned char *out, unsigned int *out_len, void *wrkmem);
+
+#endif
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-20 11:38:23 +0000