1 files changed, 249 insertions, 67 deletions

diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c
index b9bd4ff5535e..c1a49ecf9d98 100644
--- a/drivers/media/video/cx18/cx18-queue.c
+++ b/drivers/media/video/cx18/cx18-queue.c
@@ -26,6 +26,7 @@
 #include "cx18-queue.h"
 #include "cx18-streams.h"
 #include "cx18-scb.h"
+#include "cx18-io.h"
 
 void cx18_buf_swap(struct cx18_buffer *buf)
 {
@@ -35,6 +36,17 @@ void cx18_buf_swap(struct cx18_buffer *buf)
                 swab32s((u32 *)(buf->buf + i));
 }
 
+void _cx18_mdl_swap(struct cx18_mdl *mdl)
+{
+        struct cx18_buffer *buf;
+
+        list_for_each_entry(buf, &mdl->buf_list, list) {
+                if (buf->bytesused == 0)
+                        break;
+                cx18_buf_swap(buf);
+        }
+}
+
 void cx18_queue_init(struct cx18_queue *q)
 {
         INIT_LIST_HEAD(&q->list);
@@ -42,15 +54,16 @@ void cx18_queue_init(struct cx18_queue *q)
         q->bytesused = 0;
 }
 
-struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
+struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_mdl *mdl,
                                  struct cx18_queue *q, int to_front)
 {
-        /* clear the buffer if it is not to be enqueued to the full queue */
+        /* clear the mdl if it is not to be enqueued to the full queue */
         if (q != &s->q_full) {
-                buf->bytesused = 0;
-                buf->readpos = 0;
-                buf->b_flags = 0;
-                buf->skipped = 0;
+                mdl->bytesused = 0;
+                mdl->readpos = 0;
+                mdl->m_flags = 0;
+                mdl->skipped = 0;
+                mdl->curr_buf = NULL;
         }
 
         /* q_busy is restricted to a max buffer count imposed by firmware */
@@ -61,125 +74,270 @@ struct cx18_queue *_cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf,
         spin_lock(&q->lock);
 
         if (to_front)
-                list_add(&buf->list, &q->list); /* LIFO */
+                list_add(&mdl->list, &q->list); /* LIFO */
         else
-                list_add_tail(&buf->list, &q->list); /* FIFO */
-        q->bytesused += buf->bytesused - buf->readpos;
+                list_add_tail(&mdl->list, &q->list); /* FIFO */
+        q->bytesused += mdl->bytesused - mdl->readpos;
         atomic_inc(&q->depth);
 
         spin_unlock(&q->lock);
         return q;
 }
 
-struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
+struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
 {
-        struct cx18_buffer *buf = NULL;
+        struct cx18_mdl *mdl = NULL;
 
         spin_lock(&q->lock);
         if (!list_empty(&q->list)) {
-                buf = list_first_entry(&q->list, struct cx18_buffer, list);
-                list_del_init(&buf->list);
-                q->bytesused -= buf->bytesused - buf->readpos;
-                buf->skipped = 0;
+                mdl = list_first_entry(&q->list, struct cx18_mdl, list);
+                list_del_init(&mdl->list);
+                q->bytesused -= mdl->bytesused - mdl->readpos;
+                mdl->skipped = 0;
                 atomic_dec(&q->depth);
         }
         spin_unlock(&q->lock);
-        return buf;
+        return mdl;
+}
+
+static void _cx18_mdl_set_buf_bytesused(struct cx18_stream *s,
+                                        struct cx18_mdl *mdl)
+{
+        struct cx18_buffer *buf;
+        u32 buf_size = s->buf_size;
+        u32 bytesused = mdl->bytesused;
+
+        list_for_each_entry(buf, &mdl->buf_list, list) {
+                buf->readpos = 0;
+                if (bytesused >= buf_size) {
+                        buf->bytesused = buf_size;
+                        bytesused -= buf_size;
+                } else {
+                        buf->bytesused = bytesused;
+                        bytesused = 0;
+                }
+        }
 }
 
-struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id,
+static inline void cx18_mdl_set_buf_bytesused(struct cx18_stream *s,
+                                              struct cx18_mdl *mdl)
+{
+        struct cx18_buffer *buf;
+
+        if (list_is_singular(&mdl->buf_list)) {
+                buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
+                                       list);
+                buf->bytesused = mdl->bytesused;
+                buf->readpos = 0;
+        } else {
+                _cx18_mdl_set_buf_bytesused(s, mdl);
+        }
+}
+
+struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
         u32 bytesused)
 {
         struct cx18 *cx = s->cx;
-        struct cx18_buffer *buf;
-        struct cx18_buffer *tmp;
-        struct cx18_buffer *ret = NULL;
+        struct cx18_mdl *mdl;
+        struct cx18_mdl *tmp;
+        struct cx18_mdl *ret = NULL;
         LIST_HEAD(sweep_up);
 
         /*
          * We don't have to acquire multiple q locks here, because we are
          * serialized by the single threaded work handler.
-         * Buffers from the firmware will thus remain in order as
+         * MDLs from the firmware will thus remain in order as
          * they are moved from q_busy to q_full or to the dvb ring buffer.
          */
         spin_lock(&s->q_busy.lock);
-        list_for_each_entry_safe(buf, tmp, &s->q_busy.list, list) {
+        list_for_each_entry_safe(mdl, tmp, &s->q_busy.list, list) {
                 /*
                  * We should find what the firmware told us is done,
                  * right at the front of the queue.  If we don't, we likely have
-                 * missed a buffer done message from the firmware.
-                 * Once we skip a buffer repeatedly, relative to the size of
+                 * missed an mdl done message from the firmware.
+                 * Once we skip an mdl repeatedly, relative to the size of
                  * q_busy, we have high confidence we've missed it.
                  */
-                if (buf->id != id) {
-                        buf->skipped++;
-                        if (buf->skipped >= atomic_read(&s->q_busy.depth)-1) {
-                                /* buffer must have fallen out of rotation */
-                                CX18_WARN("Skipped %s, buffer %d, %d "
+                if (mdl->id != id) {
+                        mdl->skipped++;
+                        if (mdl->skipped >= atomic_read(&s->q_busy.depth)-1) {
+                                /* mdl must have fallen out of rotation */
+                                CX18_WARN("Skipped %s, MDL %d, %d "
                                           "times - it must have dropped out of "
-                                          "rotation\n", s->name, buf->id,
-                                          buf->skipped);
+                                          "rotation\n", s->name, mdl->id,
+                                          mdl->skipped);
                                 /* Sweep it up to put it back into rotation */
-                                list_move_tail(&buf->list, &sweep_up);
+                                list_move_tail(&mdl->list, &sweep_up);
                                 atomic_dec(&s->q_busy.depth);
                         }
                         continue;
                 }
                 /*
-                 * We pull the desired buffer off of the queue here.  Something
+                 * We pull the desired mdl off of the queue here.  Something
                  * will have to put it back on a queue later.
                  */
-                list_del_init(&buf->list);
+                list_del_init(&mdl->list);
                 atomic_dec(&s->q_busy.depth);
-                ret = buf;
+                ret = mdl;
                 break;
         }
         spin_unlock(&s->q_busy.lock);
 
         /*
-         * We found the buffer for which we were looking.  Get it ready for
+         * We found the mdl for which we were looking.  Get it ready for
          * the caller to put on q_full or in the dvb ring buffer.
          */
         if (ret != NULL) {
                 ret->bytesused = bytesused;
                 ret->skipped = 0;
-                /* readpos and b_flags were 0'ed when the buf went on q_busy */
-                cx18_buf_sync_for_cpu(s, ret);
+                /* 0'ed readpos, m_flags & curr_buf when mdl went on q_busy */
+                cx18_mdl_set_buf_bytesused(s, ret);
+                cx18_mdl_sync_for_cpu(s, ret);
                 if (s->type != CX18_ENC_STREAM_TYPE_TS)
-                        set_bit(CX18_F_B_NEED_BUF_SWAP, &ret->b_flags);
+                        set_bit(CX18_F_M_NEED_SWAP, &ret->m_flags);
         }
 
-        /* Put any buffers the firmware is ignoring back into normal rotation */
-        list_for_each_entry_safe(buf, tmp, &sweep_up, list) {
-                list_del_init(&buf->list);
-                cx18_enqueue(s, buf, &s->q_free);
+        /* Put any mdls the firmware is ignoring back into normal rotation */
+        list_for_each_entry_safe(mdl, tmp, &sweep_up, list) {
+                list_del_init(&mdl->list);
+                cx18_enqueue(s, mdl, &s->q_free);
         }
         return ret;
 }
 
-/* Move all buffers of a queue to q_free, while flushing the buffers */
-static void cx18_queue_flush(struct cx18_stream *s, struct cx18_queue *q)
+/* Move all mdls of a queue, while flushing the mdl */
+static void cx18_queue_flush(struct cx18_stream *s,
+                             struct cx18_queue *q_src, struct cx18_queue *q_dst)
 {
-        struct cx18_buffer *buf;
+        struct cx18_mdl *mdl;
 
-        if (q == &s->q_free)
+        /* It only makes sense to flush to q_free or q_idle */
+        if (q_src == q_dst || q_dst == &s->q_full || q_dst == &s->q_busy)
                 return;
 
-        spin_lock(&q->lock);
-        while (!list_empty(&q->list)) {
-                buf = list_first_entry(&q->list, struct cx18_buffer, list);
-                list_move_tail(&buf->list, &s->q_free.list);
-                buf->bytesused = buf->readpos = buf->b_flags = buf->skipped = 0;
-                atomic_inc(&s->q_free.depth);
+        spin_lock(&q_src->lock);
+        spin_lock(&q_dst->lock);
+        while (!list_empty(&q_src->list)) {
+                mdl = list_first_entry(&q_src->list, struct cx18_mdl, list);
+                list_move_tail(&mdl->list, &q_dst->list);
+                mdl->bytesused = 0;
+                mdl->readpos = 0;
+                mdl->m_flags = 0;
+                mdl->skipped = 0;
+                mdl->curr_buf = NULL;
+                atomic_inc(&q_dst->depth);
         }
-        cx18_queue_init(q);
-        spin_unlock(&q->lock);
+        cx18_queue_init(q_src);
+        spin_unlock(&q_src->lock);
+        spin_unlock(&q_dst->lock);
 }
 
 void cx18_flush_queues(struct cx18_stream *s)
 {
-        cx18_queue_flush(s, &s->q_busy);
-        cx18_queue_flush(s, &s->q_full);
+        cx18_queue_flush(s, &s->q_busy, &s->q_free);
+        cx18_queue_flush(s, &s->q_full, &s->q_free);
+}
+
+/*
+ * Note, s->buf_pool is not protected by a lock,
+ * the stream better not have *anything* going on when calling this
+ */
+void cx18_unload_queues(struct cx18_stream *s)
+{
+        struct cx18_queue *q_idle = &s->q_idle;
+        struct cx18_mdl *mdl;
+        struct cx18_buffer *buf;
+
+        /* Move all MDLS to q_idle */
+        cx18_queue_flush(s, &s->q_busy, q_idle);
+        cx18_queue_flush(s, &s->q_full, q_idle);
+        cx18_queue_flush(s, &s->q_free, q_idle);
+
+        /* Reset MDL id's and move all buffers back to the stream's buf_pool */
+        spin_lock(&q_idle->lock);
+        list_for_each_entry(mdl, &q_idle->list, list) {
+                while (!list_empty(&mdl->buf_list)) {
+                        buf = list_first_entry(&mdl->buf_list,
+                                               struct cx18_buffer, list);
+                        list_move_tail(&buf->list, &s->buf_pool);
+                        buf->bytesused = 0;
+                        buf->readpos = 0;
+                }
+                mdl->id = s->mdl_base_idx; /* reset id to a "safe" value */
+                /* all other mdl fields were cleared by cx18_queue_flush() */
+        }
+        spin_unlock(&q_idle->lock);
+}
+
+/*
+ * Note, s->buf_pool is not protected by a lock,
+ * the stream better not have *anything* going on when calling this
+ */
+void cx18_load_queues(struct cx18_stream *s)
+{
+        struct cx18 *cx = s->cx;
+        struct cx18_mdl *mdl;
+        struct cx18_buffer *buf;
+        int mdl_id;
+        int i;
+
+        /*
+         * Attach buffers to MDLs, give the MDLs ids, and add MDLs to q_free
+         * Excess MDLs are left on q_idle
+         * Excess buffers are left in buf_pool and/or on an MDL in q_idle
+         */
+        mdl_id = s->mdl_base_idx;
+        for (mdl = cx18_dequeue(s, &s->q_idle), i = s->bufs_per_mdl;
+             mdl != NULL && i == s->bufs_per_mdl;
+             mdl = cx18_dequeue(s, &s->q_idle)) {
+
+                mdl->id = mdl_id;
+
+                for (i = 0; i < s->bufs_per_mdl; i++) {
+                        if (list_empty(&s->buf_pool))
+                                break;
+
+                        buf = list_first_entry(&s->buf_pool, struct cx18_buffer,
+                                               list);
+                        list_move_tail(&buf->list, &mdl->buf_list);
+
+                        /* update the firmware's MDL array with this buffer */
+                        cx18_writel(cx, buf->dma_handle,
+                                    &cx->scb->cpu_mdl[mdl_id + i].paddr);
+                        cx18_writel(cx, s->buf_size,
+                                    &cx->scb->cpu_mdl[mdl_id + i].length);
+                }
+
+                if (i == s->bufs_per_mdl)
+                        cx18_enqueue(s, mdl, &s->q_free);
+                else
+                        cx18_push(s, mdl, &s->q_idle); /* not enough buffers */
+                mdl_id += i;
+        }
+}
+
+void _cx18_mdl_sync_for_cpu(struct cx18_stream *s, struct cx18_mdl *mdl)
+{
+        int dma = s->dma;
+        u32 buf_size = s->buf_size;
+        struct pci_dev *pci_dev = s->cx->pci_dev;
+        struct cx18_buffer *buf;
+
+        list_for_each_entry(buf, &mdl->buf_list, list)
+                pci_dma_sync_single_for_cpu(pci_dev, buf->dma_handle,
+                                            buf_size, dma);
+}
+
+void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl)
+{
+        int dma = s->dma;
+        u32 buf_size = s->buf_size;
+        struct pci_dev *pci_dev = s->cx->pci_dev;
+        struct cx18_buffer *buf;
+
+        list_for_each_entry(buf, &mdl->buf_list, list)
+                pci_dma_sync_single_for_device(pci_dev, buf->dma_handle,
+                                               buf_size, dma);
 }
 
 int cx18_stream_alloc(struct cx18_stream *s)
@@ -207,24 +365,40 @@ int cx18_stream_alloc(struct cx18_stream *s)
 
         s->mdl_base_idx = cx->free_mdl_idx;
 
-        /* allocate stream buffers. Initially all buffers are in q_free. */
+        /* allocate stream buffers and MDLs */
         for (i = 0; i < s->buffers; i++) {
-                struct cx18_buffer *buf = kzalloc(sizeof(struct cx18_buffer),
-                                                GFP_KERNEL|__GFP_NOWARN);
+                struct cx18_mdl *mdl;
+                struct cx18_buffer *buf;
 
-                if (buf == NULL)
+                /* 1 MDL per buffer to handle the worst & also default case */
+                mdl = kzalloc(sizeof(struct cx18_mdl), GFP_KERNEL|__GFP_NOWARN);
+                if (mdl == NULL)
                         break;
+
+                buf = kzalloc(sizeof(struct cx18_buffer),
+                                GFP_KERNEL|__GFP_NOWARN);
+                if (buf == NULL) {
+                        kfree(mdl);
+                        break;
+                }
+
                 buf->buf = kmalloc(s->buf_size, GFP_KERNEL|__GFP_NOWARN);
                 if (buf->buf == NULL) {
+                        kfree(mdl);
                         kfree(buf);
                         break;
                 }
-                buf->id = cx->buffer_id++;
+
+                INIT_LIST_HEAD(&mdl->list);
+                INIT_LIST_HEAD(&mdl->buf_list);
+                mdl->id = s->mdl_base_idx; /* a somewhat safe value */
+                cx18_enqueue(s, mdl, &s->q_idle);
+
                 INIT_LIST_HEAD(&buf->list);
                 buf->dma_handle = pci_map_single(s->cx->pci_dev,
                                 buf->buf, s->buf_size, s->dma);
                 cx18_buf_sync_for_cpu(s, buf);
-                cx18_enqueue(s, buf, &s->q_free);
+                list_add_tail(&buf->list, &s->buf_pool);
         }
         if (i == s->buffers) {
                 cx->free_mdl_idx += s->buffers;
@@ -237,13 +411,21 @@ int cx18_stream_alloc(struct cx18_stream *s)
 
 void cx18_stream_free(struct cx18_stream *s)
 {
+        struct cx18_mdl *mdl;
         struct cx18_buffer *buf;
 
-        /* move all buffers to q_free */
-        cx18_flush_queues(s);
+        /* move all buffers to buf_pool and all MDLs to q_idle */
+        cx18_unload_queues(s);
+
+        /* empty q_idle */
+        while ((mdl = cx18_dequeue(s, &s->q_idle)))
+                kfree(mdl);
+
+        /* empty buf_pool */
+        while (!list_empty(&s->buf_pool)) {
+                buf = list_first_entry(&s->buf_pool, struct cx18_buffer, list);
+                list_del_init(&buf->list);
 
-        /* empty q_free */
-        while ((buf = cx18_dequeue(s, &s->q_free))) {
                 pci_unmap_single(s->cx->pci_dev, buf->dma_handle,
                                 s->buf_size, s->dma);
                 kfree(buf->buf);