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-rw-r--r--drivers/comedi/comedi_buf.c691
1 files changed, 691 insertions, 0 deletions
diff --git a/drivers/comedi/comedi_buf.c b/drivers/comedi/comedi_buf.c
new file mode 100644
index 000000000..393966c09
--- /dev/null
+++ b/drivers/comedi/comedi_buf.c
@@ -0,0 +1,691 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * comedi_buf.c
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
+ * Copyright (C) 2002 Frank Mori Hess <fmhess@users.sourceforge.net>
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/slab.h>
+#include <linux/comedi/comedidev.h>
+#include "comedi_internal.h"
+
+#ifdef PAGE_KERNEL_NOCACHE
+#define COMEDI_PAGE_PROTECTION PAGE_KERNEL_NOCACHE
+#else
+#define COMEDI_PAGE_PROTECTION PAGE_KERNEL
+#endif
+
+static void comedi_buf_map_kref_release(struct kref *kref)
+{
+ struct comedi_buf_map *bm =
+ container_of(kref, struct comedi_buf_map, refcount);
+ struct comedi_buf_page *buf;
+ unsigned int i;
+
+ if (bm->page_list) {
+ if (bm->dma_dir != DMA_NONE) {
+ /*
+ * DMA buffer was allocated as a single block.
+ * Address is in page_list[0].
+ */
+ buf = &bm->page_list[0];
+ dma_free_coherent(bm->dma_hw_dev,
+ PAGE_SIZE * bm->n_pages,
+ buf->virt_addr, buf->dma_addr);
+ } else {
+ for (i = 0; i < bm->n_pages; i++) {
+ buf = &bm->page_list[i];
+ ClearPageReserved(virt_to_page(buf->virt_addr));
+ free_page((unsigned long)buf->virt_addr);
+ }
+ }
+ vfree(bm->page_list);
+ }
+ if (bm->dma_dir != DMA_NONE)
+ put_device(bm->dma_hw_dev);
+ kfree(bm);
+}
+
+static void __comedi_buf_free(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+ struct comedi_buf_map *bm;
+ unsigned long flags;
+
+ if (async->prealloc_buf) {
+ if (s->async_dma_dir == DMA_NONE)
+ vunmap(async->prealloc_buf);
+ async->prealloc_buf = NULL;
+ async->prealloc_bufsz = 0;
+ }
+
+ spin_lock_irqsave(&s->spin_lock, flags);
+ bm = async->buf_map;
+ async->buf_map = NULL;
+ spin_unlock_irqrestore(&s->spin_lock, flags);
+ comedi_buf_map_put(bm);
+}
+
+static struct comedi_buf_map *
+comedi_buf_map_alloc(struct comedi_device *dev, enum dma_data_direction dma_dir,
+ unsigned int n_pages)
+{
+ struct comedi_buf_map *bm;
+ struct comedi_buf_page *buf;
+ unsigned int i;
+
+ bm = kzalloc(sizeof(*bm), GFP_KERNEL);
+ if (!bm)
+ return NULL;
+
+ kref_init(&bm->refcount);
+ bm->dma_dir = dma_dir;
+ if (bm->dma_dir != DMA_NONE) {
+ /* Need ref to hardware device to free buffer later. */
+ bm->dma_hw_dev = get_device(dev->hw_dev);
+ }
+
+ bm->page_list = vzalloc(sizeof(*buf) * n_pages);
+ if (!bm->page_list)
+ goto err;
+
+ if (bm->dma_dir != DMA_NONE) {
+ void *virt_addr;
+ dma_addr_t dma_addr;
+
+ /*
+ * Currently, the DMA buffer needs to be allocated as a
+ * single block so that it can be mmap()'ed.
+ */
+ virt_addr = dma_alloc_coherent(bm->dma_hw_dev,
+ PAGE_SIZE * n_pages, &dma_addr,
+ GFP_KERNEL);
+ if (!virt_addr)
+ goto err;
+
+ for (i = 0; i < n_pages; i++) {
+ buf = &bm->page_list[i];
+ buf->virt_addr = virt_addr + (i << PAGE_SHIFT);
+ buf->dma_addr = dma_addr + (i << PAGE_SHIFT);
+ }
+
+ bm->n_pages = i;
+ } else {
+ for (i = 0; i < n_pages; i++) {
+ buf = &bm->page_list[i];
+ buf->virt_addr = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!buf->virt_addr)
+ break;
+
+ SetPageReserved(virt_to_page(buf->virt_addr));
+ }
+
+ bm->n_pages = i;
+ if (i < n_pages)
+ goto err;
+ }
+
+ return bm;
+
+err:
+ comedi_buf_map_put(bm);
+ return NULL;
+}
+
+static void __comedi_buf_alloc(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ unsigned int n_pages)
+{
+ struct comedi_async *async = s->async;
+ struct page **pages = NULL;
+ struct comedi_buf_map *bm;
+ struct comedi_buf_page *buf;
+ unsigned long flags;
+ unsigned int i;
+
+ if (!IS_ENABLED(CONFIG_HAS_DMA) && s->async_dma_dir != DMA_NONE) {
+ dev_err(dev->class_dev,
+ "dma buffer allocation not supported\n");
+ return;
+ }
+
+ bm = comedi_buf_map_alloc(dev, s->async_dma_dir, n_pages);
+ if (!bm)
+ return;
+
+ spin_lock_irqsave(&s->spin_lock, flags);
+ async->buf_map = bm;
+ spin_unlock_irqrestore(&s->spin_lock, flags);
+
+ if (bm->dma_dir != DMA_NONE) {
+ /*
+ * DMA buffer was allocated as a single block.
+ * Address is in page_list[0].
+ */
+ buf = &bm->page_list[0];
+ async->prealloc_buf = buf->virt_addr;
+ } else {
+ pages = vmalloc(sizeof(struct page *) * n_pages);
+ if (!pages)
+ return;
+
+ for (i = 0; i < n_pages; i++) {
+ buf = &bm->page_list[i];
+ pages[i] = virt_to_page(buf->virt_addr);
+ }
+
+ /* vmap the pages to prealloc_buf */
+ async->prealloc_buf = vmap(pages, n_pages, VM_MAP,
+ COMEDI_PAGE_PROTECTION);
+
+ vfree(pages);
+ }
+}
+
+void comedi_buf_map_get(struct comedi_buf_map *bm)
+{
+ if (bm)
+ kref_get(&bm->refcount);
+}
+
+int comedi_buf_map_put(struct comedi_buf_map *bm)
+{
+ if (bm)
+ return kref_put(&bm->refcount, comedi_buf_map_kref_release);
+ return 1;
+}
+
+/* helper for "access" vm operation */
+int comedi_buf_map_access(struct comedi_buf_map *bm, unsigned long offset,
+ void *buf, int len, int write)
+{
+ unsigned int pgoff = offset_in_page(offset);
+ unsigned long pg = offset >> PAGE_SHIFT;
+ int done = 0;
+
+ while (done < len && pg < bm->n_pages) {
+ int l = min_t(int, len - done, PAGE_SIZE - pgoff);
+ void *b = bm->page_list[pg].virt_addr + pgoff;
+
+ if (write)
+ memcpy(b, buf, l);
+ else
+ memcpy(buf, b, l);
+ buf += l;
+ done += l;
+ pg++;
+ pgoff = 0;
+ }
+ return done;
+}
+
+/* returns s->async->buf_map and increments its kref refcount */
+struct comedi_buf_map *
+comedi_buf_map_from_subdev_get(struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+ struct comedi_buf_map *bm = NULL;
+ unsigned long flags;
+
+ if (!async)
+ return NULL;
+
+ spin_lock_irqsave(&s->spin_lock, flags);
+ bm = async->buf_map;
+ /* only want it if buffer pages allocated */
+ if (bm && bm->n_pages)
+ comedi_buf_map_get(bm);
+ else
+ bm = NULL;
+ spin_unlock_irqrestore(&s->spin_lock, flags);
+
+ return bm;
+}
+
+bool comedi_buf_is_mmapped(struct comedi_subdevice *s)
+{
+ struct comedi_buf_map *bm = s->async->buf_map;
+
+ return bm && (kref_read(&bm->refcount) > 1);
+}
+
+int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,
+ unsigned long new_size)
+{
+ struct comedi_async *async = s->async;
+
+ lockdep_assert_held(&dev->mutex);
+
+ /* Round up new_size to multiple of PAGE_SIZE */
+ new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
+
+ /* if no change is required, do nothing */
+ if (async->prealloc_buf && async->prealloc_bufsz == new_size)
+ return 0;
+
+ /* deallocate old buffer */
+ __comedi_buf_free(dev, s);
+
+ /* allocate new buffer */
+ if (new_size) {
+ unsigned int n_pages = new_size >> PAGE_SHIFT;
+
+ __comedi_buf_alloc(dev, s, n_pages);
+
+ if (!async->prealloc_buf) {
+ /* allocation failed */
+ __comedi_buf_free(dev, s);
+ return -ENOMEM;
+ }
+ }
+ async->prealloc_bufsz = new_size;
+
+ return 0;
+}
+
+void comedi_buf_reset(struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+
+ async->buf_write_alloc_count = 0;
+ async->buf_write_count = 0;
+ async->buf_read_alloc_count = 0;
+ async->buf_read_count = 0;
+
+ async->buf_write_ptr = 0;
+ async->buf_read_ptr = 0;
+
+ async->cur_chan = 0;
+ async->scans_done = 0;
+ async->scan_progress = 0;
+ async->munge_chan = 0;
+ async->munge_count = 0;
+ async->munge_ptr = 0;
+
+ async->events = 0;
+}
+
+static unsigned int comedi_buf_write_n_unalloc(struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+ unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
+
+ return free_end - async->buf_write_alloc_count;
+}
+
+unsigned int comedi_buf_write_n_available(struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+ unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
+
+ return free_end - async->buf_write_count;
+}
+
+/**
+ * comedi_buf_write_alloc() - Reserve buffer space for writing
+ * @s: COMEDI subdevice.
+ * @nbytes: Maximum space to reserve in bytes.
+ *
+ * Reserve up to @nbytes bytes of space to be written in the COMEDI acquisition
+ * data buffer associated with the subdevice. The amount reserved is limited
+ * by the space available.
+ *
+ * Return: The amount of space reserved in bytes.
+ */
+unsigned int comedi_buf_write_alloc(struct comedi_subdevice *s,
+ unsigned int nbytes)
+{
+ struct comedi_async *async = s->async;
+ unsigned int unalloc = comedi_buf_write_n_unalloc(s);
+
+ if (nbytes > unalloc)
+ nbytes = unalloc;
+
+ async->buf_write_alloc_count += nbytes;
+
+ /*
+ * ensure the async buffer 'counts' are read and updated
+ * before we write data to the write-alloc'ed buffer space
+ */
+ smp_mb();
+
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_write_alloc);
+
+/*
+ * munging is applied to data by core as it passes between user
+ * and kernel space
+ */
+static unsigned int comedi_buf_munge(struct comedi_subdevice *s,
+ unsigned int num_bytes)
+{
+ struct comedi_async *async = s->async;
+ unsigned int count = 0;
+ const unsigned int num_sample_bytes = comedi_bytes_per_sample(s);
+
+ if (!s->munge || (async->cmd.flags & CMDF_RAWDATA)) {
+ async->munge_count += num_bytes;
+ return num_bytes;
+ }
+
+ /* don't munge partial samples */
+ num_bytes -= num_bytes % num_sample_bytes;
+ while (count < num_bytes) {
+ int block_size = num_bytes - count;
+ unsigned int buf_end;
+
+ buf_end = async->prealloc_bufsz - async->munge_ptr;
+ if (block_size > buf_end)
+ block_size = buf_end;
+
+ s->munge(s->device, s,
+ async->prealloc_buf + async->munge_ptr,
+ block_size, async->munge_chan);
+
+ /*
+ * ensure data is munged in buffer before the
+ * async buffer munge_count is incremented
+ */
+ smp_wmb();
+
+ async->munge_chan += block_size / num_sample_bytes;
+ async->munge_chan %= async->cmd.chanlist_len;
+ async->munge_count += block_size;
+ async->munge_ptr += block_size;
+ async->munge_ptr %= async->prealloc_bufsz;
+ count += block_size;
+ }
+
+ return count;
+}
+
+unsigned int comedi_buf_write_n_allocated(struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+
+ return async->buf_write_alloc_count - async->buf_write_count;
+}
+
+/**
+ * comedi_buf_write_free() - Free buffer space after it is written
+ * @s: COMEDI subdevice.
+ * @nbytes: Maximum space to free in bytes.
+ *
+ * Free up to @nbytes bytes of space previously reserved for writing in the
+ * COMEDI acquisition data buffer associated with the subdevice. The amount of
+ * space freed is limited to the amount that was reserved. The freed space is
+ * assumed to have been filled with sample data by the writer.
+ *
+ * If the samples in the freed space need to be "munged", do so here. The
+ * freed space becomes available for allocation by the reader.
+ *
+ * Return: The amount of space freed in bytes.
+ */
+unsigned int comedi_buf_write_free(struct comedi_subdevice *s,
+ unsigned int nbytes)
+{
+ struct comedi_async *async = s->async;
+ unsigned int allocated = comedi_buf_write_n_allocated(s);
+
+ if (nbytes > allocated)
+ nbytes = allocated;
+
+ async->buf_write_count += nbytes;
+ async->buf_write_ptr += nbytes;
+ comedi_buf_munge(s, async->buf_write_count - async->munge_count);
+ if (async->buf_write_ptr >= async->prealloc_bufsz)
+ async->buf_write_ptr %= async->prealloc_bufsz;
+
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_write_free);
+
+/**
+ * comedi_buf_read_n_available() - Determine amount of readable buffer space
+ * @s: COMEDI subdevice.
+ *
+ * Determine the amount of readable buffer space in the COMEDI acquisition data
+ * buffer associated with the subdevice. The readable buffer space is that
+ * which has been freed by the writer and "munged" to the sample data format
+ * expected by COMEDI if necessary.
+ *
+ * Return: The amount of readable buffer space.
+ */
+unsigned int comedi_buf_read_n_available(struct comedi_subdevice *s)
+{
+ struct comedi_async *async = s->async;
+ unsigned int num_bytes;
+
+ if (!async)
+ return 0;
+
+ num_bytes = async->munge_count - async->buf_read_count;
+
+ /*
+ * ensure the async buffer 'counts' are read before we
+ * attempt to read data from the buffer
+ */
+ smp_rmb();
+
+ return num_bytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_read_n_available);
+
+/**
+ * comedi_buf_read_alloc() - Reserve buffer space for reading
+ * @s: COMEDI subdevice.
+ * @nbytes: Maximum space to reserve in bytes.
+ *
+ * Reserve up to @nbytes bytes of previously written and "munged" buffer space
+ * for reading in the COMEDI acquisition data buffer associated with the
+ * subdevice. The amount reserved is limited to the space available. The
+ * reader can read from the reserved space and then free it. A reader is also
+ * allowed to read from the space before reserving it as long as it determines
+ * the amount of readable data available, but the space needs to be marked as
+ * reserved before it can be freed.
+ *
+ * Return: The amount of space reserved in bytes.
+ */
+unsigned int comedi_buf_read_alloc(struct comedi_subdevice *s,
+ unsigned int nbytes)
+{
+ struct comedi_async *async = s->async;
+ unsigned int available;
+
+ available = async->munge_count - async->buf_read_alloc_count;
+ if (nbytes > available)
+ nbytes = available;
+
+ async->buf_read_alloc_count += nbytes;
+
+ /*
+ * ensure the async buffer 'counts' are read before we
+ * attempt to read data from the read-alloc'ed buffer space
+ */
+ smp_rmb();
+
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_read_alloc);
+
+static unsigned int comedi_buf_read_n_allocated(struct comedi_async *async)
+{
+ return async->buf_read_alloc_count - async->buf_read_count;
+}
+
+/**
+ * comedi_buf_read_free() - Free buffer space after it has been read
+ * @s: COMEDI subdevice.
+ * @nbytes: Maximum space to free in bytes.
+ *
+ * Free up to @nbytes bytes of buffer space previously reserved for reading in
+ * the COMEDI acquisition data buffer associated with the subdevice. The
+ * amount of space freed is limited to the amount that was reserved.
+ *
+ * The freed space becomes available for allocation by the writer.
+ *
+ * Return: The amount of space freed in bytes.
+ */
+unsigned int comedi_buf_read_free(struct comedi_subdevice *s,
+ unsigned int nbytes)
+{
+ struct comedi_async *async = s->async;
+ unsigned int allocated;
+
+ /*
+ * ensure data has been read out of buffer before
+ * the async read count is incremented
+ */
+ smp_mb();
+
+ allocated = comedi_buf_read_n_allocated(async);
+ if (nbytes > allocated)
+ nbytes = allocated;
+
+ async->buf_read_count += nbytes;
+ async->buf_read_ptr += nbytes;
+ async->buf_read_ptr %= async->prealloc_bufsz;
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_read_free);
+
+static void comedi_buf_memcpy_to(struct comedi_subdevice *s,
+ const void *data, unsigned int num_bytes)
+{
+ struct comedi_async *async = s->async;
+ unsigned int write_ptr = async->buf_write_ptr;
+
+ while (num_bytes) {
+ unsigned int block_size;
+
+ if (write_ptr + num_bytes > async->prealloc_bufsz)
+ block_size = async->prealloc_bufsz - write_ptr;
+ else
+ block_size = num_bytes;
+
+ memcpy(async->prealloc_buf + write_ptr, data, block_size);
+
+ data += block_size;
+ num_bytes -= block_size;
+
+ write_ptr = 0;
+ }
+}
+
+static void comedi_buf_memcpy_from(struct comedi_subdevice *s,
+ void *dest, unsigned int nbytes)
+{
+ void *src;
+ struct comedi_async *async = s->async;
+ unsigned int read_ptr = async->buf_read_ptr;
+
+ while (nbytes) {
+ unsigned int block_size;
+
+ src = async->prealloc_buf + read_ptr;
+
+ if (nbytes >= async->prealloc_bufsz - read_ptr)
+ block_size = async->prealloc_bufsz - read_ptr;
+ else
+ block_size = nbytes;
+
+ memcpy(dest, src, block_size);
+ nbytes -= block_size;
+ dest += block_size;
+ read_ptr = 0;
+ }
+}
+
+/**
+ * comedi_buf_write_samples() - Write sample data to COMEDI buffer
+ * @s: COMEDI subdevice.
+ * @data: Pointer to source samples.
+ * @nsamples: Number of samples to write.
+ *
+ * Write up to @nsamples samples to the COMEDI acquisition data buffer
+ * associated with the subdevice, mark it as written and update the
+ * acquisition scan progress. If there is not enough room for the specified
+ * number of samples, the number of samples written is limited to the number
+ * that will fit and the %COMEDI_CB_OVERFLOW event flag is set to cause the
+ * acquisition to terminate with an overrun error. Set the %COMEDI_CB_BLOCK
+ * event flag if any samples are written to cause waiting tasks to be woken
+ * when the event flags are processed.
+ *
+ * Return: The amount of data written in bytes.
+ */
+unsigned int comedi_buf_write_samples(struct comedi_subdevice *s,
+ const void *data, unsigned int nsamples)
+{
+ unsigned int max_samples;
+ unsigned int nbytes;
+
+ /*
+ * Make sure there is enough room in the buffer for all the samples.
+ * If not, clamp the nsamples to the number that will fit, flag the
+ * buffer overrun and add the samples that fit.
+ */
+ max_samples = comedi_bytes_to_samples(s, comedi_buf_write_n_unalloc(s));
+ if (nsamples > max_samples) {
+ dev_warn(s->device->class_dev, "buffer overrun\n");
+ s->async->events |= COMEDI_CB_OVERFLOW;
+ nsamples = max_samples;
+ }
+
+ if (nsamples == 0)
+ return 0;
+
+ nbytes = comedi_buf_write_alloc(s,
+ comedi_samples_to_bytes(s, nsamples));
+ comedi_buf_memcpy_to(s, data, nbytes);
+ comedi_buf_write_free(s, nbytes);
+ comedi_inc_scan_progress(s, nbytes);
+ s->async->events |= COMEDI_CB_BLOCK;
+
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_write_samples);
+
+/**
+ * comedi_buf_read_samples() - Read sample data from COMEDI buffer
+ * @s: COMEDI subdevice.
+ * @data: Pointer to destination.
+ * @nsamples: Maximum number of samples to read.
+ *
+ * Read up to @nsamples samples from the COMEDI acquisition data buffer
+ * associated with the subdevice, mark it as read and update the acquisition
+ * scan progress. Limit the number of samples read to the number available.
+ * Set the %COMEDI_CB_BLOCK event flag if any samples are read to cause waiting
+ * tasks to be woken when the event flags are processed.
+ *
+ * Return: The amount of data read in bytes.
+ */
+unsigned int comedi_buf_read_samples(struct comedi_subdevice *s,
+ void *data, unsigned int nsamples)
+{
+ unsigned int max_samples;
+ unsigned int nbytes;
+
+ /* clamp nsamples to the number of full samples available */
+ max_samples = comedi_bytes_to_samples(s,
+ comedi_buf_read_n_available(s));
+ if (nsamples > max_samples)
+ nsamples = max_samples;
+
+ if (nsamples == 0)
+ return 0;
+
+ nbytes = comedi_buf_read_alloc(s,
+ comedi_samples_to_bytes(s, nsamples));
+ comedi_buf_memcpy_from(s, data, nbytes);
+ comedi_buf_read_free(s, nbytes);
+ comedi_inc_scan_progress(s, nbytes);
+ s->async->events |= COMEDI_CB_BLOCK;
+
+ return nbytes;
+}
+EXPORT_SYMBOL_GPL(comedi_buf_read_samples);