Hi Kieran,
Thank you for the patch.
On Thursday, 3 May 2018 16:35:43 EEST Kieran Bingham wrote:
> Adapt the dl->body0 object to use an object from the body pool. This
> greatly reduces the pressure on the TLB for IPMMU use cases, as all of
> the lists use a single allocation for the main body.
>
> The CLU and LUT objects pre-allocate a pool containing three bodies,
> allowing a userspace update before the hardware has committed a previous
> set of tables.
>
> Bodies are no longer 'freed' in interrupt context, but instead released
> back to their respective pools. This allows us to remove the garbage
> collector in the DLM.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+rene...@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinch...@ideasonboard.com>
> ---
> v9:
> - Remove redundant reference to gc_bodies
>
> v8:
> - Don't pass dlm->pool through vsp1_dl_list_alloc() as it's already in the
> dlm. - Fix up comments
>
> v4-v7:
> - No changes (except rebases)
>
> v3:
> - 's/fragment/body', 's/fragments/bodies/'
> - CLU/LUT now allocate 3 bodies
> - vsp1_dl_list_fragments_free -> vsp1_dl_list_bodies_put
>
> v2:
> - Use dl->body0->max_entries to determine header offset, instead of the
> global constant VSP1_DL_NUM_ENTRIES which is incorrect.
> - squash updates for LUT, CLU, and fragment cleanup into single patch.
> (Not fully bisectable when separated)
> ---
> drivers/media/platform/vsp1/vsp1_clu.c | 27 ++-
> drivers/media/platform/vsp1/vsp1_clu.h | 1 +-
> drivers/media/platform/vsp1/vsp1_dl.c | 221 ++++++--------------------
> drivers/media/platform/vsp1/vsp1_dl.h | 3 +-
> drivers/media/platform/vsp1/vsp1_lut.c | 27 ++-
> drivers/media/platform/vsp1/vsp1_lut.h | 1 +-
> 6 files changed, 100 insertions(+), 180 deletions(-)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_clu.c
> b/drivers/media/platform/vsp1/vsp1_clu.c index ebfbb915dcdc..8efa12f5e53f
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_clu.c
> +++ b/drivers/media/platform/vsp1/vsp1_clu.c
> @@ -19,6 +19,8 @@
> #define CLU_MIN_SIZE 4U
> #define CLU_MAX_SIZE 8190U
>
> +#define CLU_SIZE (17 * 17 * 17)
> +
> /*
> ---------------------------------------------------------------------------
> -- * Device Access
> */
> @@ -43,19 +45,19 @@ static int clu_set_table(struct vsp1_clu *clu, struct
> v4l2_ctrl *ctrl) struct vsp1_dl_body *dlb;
> unsigned int i;
>
> - dlb = vsp1_dl_body_alloc(clu->entity.vsp1, 1 + 17 * 17 * 17);
> + dlb = vsp1_dl_body_get(clu->pool);
> if (!dlb)
> return -ENOMEM;
>
> vsp1_dl_body_write(dlb, VI6_CLU_ADDR, 0);
> - for (i = 0; i < 17 * 17 * 17; ++i)
> + for (i = 0; i < CLU_SIZE; ++i)
> vsp1_dl_body_write(dlb, VI6_CLU_DATA, ctrl->p_new.p_u32[i]);
>
> spin_lock_irq(&clu->lock);
> swap(clu->clu, dlb);
> spin_unlock_irq(&clu->lock);
>
> - vsp1_dl_body_free(dlb);
> + vsp1_dl_body_put(dlb);
> return 0;
> }
>
> @@ -216,8 +218,16 @@ static void clu_configure(struct vsp1_entity *entity,
> }
> }
>
> +static void clu_destroy(struct vsp1_entity *entity)
> +{
> + struct vsp1_clu *clu = to_clu(&entity->subdev);
> +
> + vsp1_dl_body_pool_destroy(clu->pool);
> +}
> +
> static const struct vsp1_entity_operations clu_entity_ops = {
> .configure = clu_configure,
> + .destroy = clu_destroy,
> };
>
> /*
> ---------------------------------------------------------------------------
> -- @@ -243,6 +253,17 @@ struct vsp1_clu *vsp1_clu_create(struct vsp1_device
> *vsp1) if (ret < 0)
> return ERR_PTR(ret);
>
> + /*
> + * Pre-allocate a body pool, with 3 bodies allowing a userspace update
> + * before the hardware has committed a previous set of tables, handling
> + * both the queued and pending dl entries. One extra entry is added to
> + * the CLU_SIZE to allow for the VI6_CLU_ADDR header.
> + */
> + clu->pool = vsp1_dl_body_pool_create(clu->entity.vsp1, 3, CLU_SIZE + 1,
> + 0);
> + if (!clu->pool)
> + return ERR_PTR(-ENOMEM);
> +
> /* Initialize the control handler. */
> v4l2_ctrl_handler_init(&clu->ctrls, 2);
> v4l2_ctrl_new_custom(&clu->ctrls, &clu_table_control, NULL);
> diff --git a/drivers/media/platform/vsp1/vsp1_clu.h
> b/drivers/media/platform/vsp1/vsp1_clu.h index c45e6e707592..cef2f44481ba
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_clu.h
> +++ b/drivers/media/platform/vsp1/vsp1_clu.h
> @@ -32,6 +32,7 @@ struct vsp1_clu {
> spinlock_t lock;
> unsigned int mode;
> struct vsp1_dl_body *clu;
> + struct vsp1_dl_body_pool *pool;
> };
>
> static inline struct vsp1_clu *to_clu(struct v4l2_subdev *subdev)
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.c
> b/drivers/media/platform/vsp1/vsp1_dl.c index 41ace89a585b..617c46a03dec
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.c
> +++ b/drivers/media/platform/vsp1/vsp1_dl.c
> @@ -108,7 +108,7 @@ struct vsp1_dl_list {
> struct vsp1_dl_header *header;
> dma_addr_t dma;
>
> - struct vsp1_dl_body body0;
> + struct vsp1_dl_body *body0;
> struct list_head bodies;
>
> bool has_chain;
> @@ -128,14 +128,12 @@ enum vsp1_dl_mode {
> * @mode: display list operation mode (header or headerless)
> * @singleshot: execute the display list in single-shot mode
> * @vsp1: the VSP1 device
> - * @lock: protects the free, active, queued, pending and gc_bodies lists
> + * @lock: protects the free, active, queued, and pending lists
> * @free: array of all free display lists
> * @active: list currently being processed (loaded) by hardware
> * @queued: list queued to the hardware (written to the DL registers)
> * @pending: list waiting to be queued to the hardware
> * @pool: body pool for the display list bodies
> - * @gc_work: bodies garbage collector work struct
> - * @gc_bodies: array of display list bodies waiting to be freed
> */
> struct vsp1_dl_manager {
> unsigned int index;
> @@ -150,9 +148,6 @@ struct vsp1_dl_manager {
> struct vsp1_dl_list *pending;
>
> struct vsp1_dl_body_pool *pool;
> -
> - struct work_struct gc_work;
> - struct list_head gc_bodies;
> };
>
> /*
> ---------------------------------------------------------------------------
> -- @@ -290,89 +285,6 @@ void vsp1_dl_body_put(struct vsp1_dl_body *dlb)
> spin_unlock_irqrestore(&dlb->pool->lock, flags);
> }
>
> -/*
> - * Initialize a display list body object and allocate DMA memory for the
> body - * data. The display list body object is expected to have been
> initialized to - * 0 when allocated.
> - */
> -static int vsp1_dl_body_init(struct vsp1_device *vsp1,
> - struct vsp1_dl_body *dlb, unsigned int num_entries,
> - size_t extra_size)
> -{
> - size_t size = num_entries * sizeof(*dlb->entries) + extra_size;
> -
> - dlb->vsp1 = vsp1;
> - dlb->size = size;
> - dlb->max_entries = num_entries;
> -
> - dlb->entries = dma_alloc_wc(vsp1->bus_master, dlb->size, &dlb->dma,
> - GFP_KERNEL);
> - if (!dlb->entries)
> - return -ENOMEM;
> -
> - return 0;
> -}
> -
> -/*
> - * Cleanup a display list body and free allocated DMA memory allocated.
> - */
> -static void vsp1_dl_body_cleanup(struct vsp1_dl_body *dlb)
> -{
> - dma_free_wc(dlb->vsp1->bus_master, dlb->size, dlb->entries, dlb->dma);
> -}
> -
> -/**
> - * vsp1_dl_body_alloc - Allocate a display list body
> - * @vsp1: The VSP1 device
> - * @num_entries: The maximum number of entries that the body can contain
> - *
> - * Allocate a display list body with enough memory to contain the requested
> - * number of entries.
> - *
> - * Return a pointer to a body on success or NULL if memory can't be
> allocated. - */
> -struct vsp1_dl_body *vsp1_dl_body_alloc(struct vsp1_device *vsp1,
> - unsigned int num_entries)
> -{
> - struct vsp1_dl_body *dlb;
> - int ret;
> -
> - dlb = kzalloc(sizeof(*dlb), GFP_KERNEL);
> - if (!dlb)
> - return NULL;
> -
> - ret = vsp1_dl_body_init(vsp1, dlb, num_entries, 0);
> - if (ret < 0) {
> - kfree(dlb);
> - return NULL;
> - }
> -
> - return dlb;
> -}
> -
> -/**
> - * vsp1_dl_body_free - Free a display list body
> - * @dlb: The body
> - *
> - * Free the given display list body and the associated DMA memory.
> - *
> - * Bodies must only be freed explicitly if they are not added to a display
> - * list, as the display list will take ownership of them and free them
> - * otherwise. Manual free typically happens at cleanup time for bodies that
> - * have been allocated but not used.
> - *
> - * Passing a NULL pointer to this function is safe, in that case no
> operation - * will be performed.
> - */
> -void vsp1_dl_body_free(struct vsp1_dl_body *dlb)
> -{
> - if (!dlb)
> - return;
> -
> - vsp1_dl_body_cleanup(dlb);
> - kfree(dlb);
> -}
> -
> /**
> * vsp1_dl_body_write - Write a register to a display list body
> * @dlb: The body
> @@ -401,8 +313,6 @@ void vsp1_dl_body_write(struct vsp1_dl_body *dlb, u32
> reg, u32 data) static struct vsp1_dl_list *vsp1_dl_list_alloc(struct
> vsp1_dl_manager *dlm) {
> struct vsp1_dl_list *dl;
> - size_t header_size;
> - int ret;
>
> dl = kzalloc(sizeof(*dl), GFP_KERNEL);
> if (!dl)
> @@ -411,41 +321,39 @@ static struct vsp1_dl_list *vsp1_dl_list_alloc(struct
> vsp1_dl_manager *dlm) INIT_LIST_HEAD(&dl->bodies);
> dl->dlm = dlm;
>
> - /*
> - * Initialize the display list body and allocate DMA memory for the body
> - * and the optional header. Both are allocated together to avoid memory
> - * fragmentation, with the header located right after the body in
> - * memory.
> - */
> - header_size = dlm->mode == VSP1_DL_MODE_HEADER
> - ? ALIGN(sizeof(struct vsp1_dl_header), 8)
> - : 0;
> -
> - ret = vsp1_dl_body_init(dlm->vsp1, &dl->body0, VSP1_DL_NUM_ENTRIES,
> - header_size);
> - if (ret < 0) {
> - kfree(dl);
> + /* Get a default body for our list. */
> + dl->body0 = vsp1_dl_body_get(dlm->pool);
> + if (!dl->body0)
> return NULL;
> - }
> -
> if (dlm->mode == VSP1_DL_MODE_HEADER) {
> - size_t header_offset = VSP1_DL_NUM_ENTRIES
> - * sizeof(*dl->body0.entries);
> + size_t header_offset = dl->body0->max_entries
> + * sizeof(*dl->body0->entries);
>
> - dl->header = ((void *)dl->body0.entries) + header_offset;
> - dl->dma = dl->body0.dma + header_offset;
> + dl->header = ((void *)dl->body0->entries) + header_offset;
> + dl->dma = dl->body0->dma + header_offset;
>
> memset(dl->header, 0, sizeof(*dl->header));
> - dl->header->lists[0].addr = dl->body0.dma;
> + dl->header->lists[0].addr = dl->body0->dma;
> }
>
> return dl;
> }
>
> +static void vsp1_dl_list_bodies_put(struct vsp1_dl_list *dl)
> +{
> + struct vsp1_dl_body *dlb, *tmp;
> +
> + list_for_each_entry_safe(dlb, tmp, &dl->bodies, list) {
> + list_del(&dlb->list);
> + vsp1_dl_body_put(dlb);
> + }
> +}
> +
> static void vsp1_dl_list_free(struct vsp1_dl_list *dl)
> {
> - vsp1_dl_body_cleanup(&dl->body0);
> - list_splice_init(&dl->bodies, &dl->dlm->gc_bodies);
> + vsp1_dl_body_put(dl->body0);
> + vsp1_dl_list_bodies_put(dl);
> +
> kfree(dl);
> }
>
> @@ -499,18 +407,13 @@ static void __vsp1_dl_list_put(struct vsp1_dl_list
> *dl)
>
> dl->has_chain = false;
>
> + vsp1_dl_list_bodies_put(dl);
> +
> /*
> - * We can't free bodies here as DMA memory can only be freed in
> - * interruptible context. Move all bodies to the display list manager's
> - * list of bodies to be freed, they will be garbage-collected by the
> - * work queue.
> + * body0 is reused as as an optimisation as presently every display list
> + * has at least one body, thus we reinitialise the entries list.
> */
> - if (!list_empty(&dl->bodies)) {
> - list_splice_init(&dl->bodies, &dl->dlm->gc_bodies);
> - schedule_work(&dl->dlm->gc_work);
> - }
> -
> - dl->body0.num_entries = 0;
> + dl->body0->num_entries = 0;
>
> list_add_tail(&dl->list, &dl->dlm->free);
> }
> @@ -547,7 +450,7 @@ void vsp1_dl_list_put(struct vsp1_dl_list *dl)
> */
> void vsp1_dl_list_write(struct vsp1_dl_list *dl, u32 reg, u32 data)
> {
> - vsp1_dl_body_write(&dl->body0, reg, data);
> + vsp1_dl_body_write(dl->body0, reg, data);
> }
>
> /**
> @@ -560,8 +463,8 @@ void vsp1_dl_list_write(struct vsp1_dl_list *dl, u32
> reg, u32 data) * which bodies are added.
> *
> * Adding a body to a display list passes ownership of the body to the
> list. The - * caller must not touch the body after this call, and must not
> free it - * explicitly with vsp1_dl_body_free().
> + * caller must not touch the body after this call, and must not release it
> + * explicitly with vsp1_dl_body_put().
> *
> * Additional bodies are only usable for display lists in header mode.
> * Attempting to add a body to a header-less display list will return an
> error. @@ -619,7 +522,7 @@ static void vsp1_dl_list_fill_header(struct
> vsp1_dl_list *dl, bool is_last) * list was allocated.
> */
>
> - hdr->num_bytes = dl->body0.num_entries
> + hdr->num_bytes = dl->body0->num_entries
> * sizeof(*dl->header->lists);
>
> list_for_each_entry(dlb, &dl->bodies, list) {
> @@ -693,9 +596,9 @@ static void vsp1_dl_list_hw_enqueue(struct vsp1_dl_list
> *dl) * bit will be cleared by the hardware when the display list
> * processing starts.
> */
> - vsp1_write(vsp1, VI6_DL_HDR_ADDR(0), dl->body0.dma);
> + vsp1_write(vsp1, VI6_DL_HDR_ADDR(0), dl->body0->dma);
> vsp1_write(vsp1, VI6_DL_BODY_SIZE, VI6_DL_BODY_SIZE_UPD |
> - (dl->body0.num_entries *
> sizeof(*dl->header->lists)));
> + (dl->body0->num_entries * sizeof(*dl->header->lists)));
> } else {
> /*
> * In header mode, program the display list header address. If
> @@ -900,45 +803,12 @@ void vsp1_dlm_reset(struct vsp1_dl_manager *dlm)
> dlm->pending = NULL;
> }
>
> -/*
> - * Free all bodies awaiting to be garbage-collected.
> - *
> - * This function must be called without the display list manager lock held.
> - */
> -static void vsp1_dlm_bodies_free(struct vsp1_dl_manager *dlm)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&dlm->lock, flags);
> -
> - while (!list_empty(&dlm->gc_bodies)) {
> - struct vsp1_dl_body *dlb;
> -
> - dlb = list_first_entry(&dlm->gc_bodies, struct vsp1_dl_body,
> - list);
> - list_del(&dlb->list);
> -
> - spin_unlock_irqrestore(&dlm->lock, flags);
> - vsp1_dl_body_free(dlb);
> - spin_lock_irqsave(&dlm->lock, flags);
> - }
> -
> - spin_unlock_irqrestore(&dlm->lock, flags);
> -}
> -
> -static void vsp1_dlm_garbage_collect(struct work_struct *work)
> -{
> - struct vsp1_dl_manager *dlm =
> - container_of(work, struct vsp1_dl_manager, gc_work);
> -
> - vsp1_dlm_bodies_free(dlm);
> -}
> -
> struct vsp1_dl_manager *vsp1_dlm_create(struct vsp1_device *vsp1,
> unsigned int index,
> unsigned int prealloc)
> {
> struct vsp1_dl_manager *dlm;
> + size_t header_size;
> unsigned int i;
>
> dlm = devm_kzalloc(vsp1->dev, sizeof(*dlm), GFP_KERNEL);
> @@ -953,8 +823,21 @@ struct vsp1_dl_manager *vsp1_dlm_create(struct
> vsp1_device *vsp1,
>
> spin_lock_init(&dlm->lock);
> INIT_LIST_HEAD(&dlm->free);
> - INIT_LIST_HEAD(&dlm->gc_bodies);
> - INIT_WORK(&dlm->gc_work, vsp1_dlm_garbage_collect);
> +
> + /*
> + * Initialize the display list body and allocate DMA memory for the body
> + * and the optional header. Both are allocated together to avoid memory
> + * fragmentation, with the header located right after the body in
> + * memory.
> + */
> + header_size = dlm->mode == VSP1_DL_MODE_HEADER
> + ? ALIGN(sizeof(struct vsp1_dl_header), 8)
> + : 0;
> +
> + dlm->pool = vsp1_dl_body_pool_create(vsp1, prealloc,
> + VSP1_DL_NUM_ENTRIES, header_size);
> + if (!dlm->pool)
> + return NULL;
>
> for (i = 0; i < prealloc; ++i) {
> struct vsp1_dl_list *dl;
> @@ -976,12 +859,10 @@ void vsp1_dlm_destroy(struct vsp1_dl_manager *dlm)
> if (!dlm)
> return;
>
> - cancel_work_sync(&dlm->gc_work);
> -
> list_for_each_entry_safe(dl, next, &dlm->free, list) {
> list_del(&dl->list);
> vsp1_dl_list_free(dl);
> }
>
> - vsp1_dlm_bodies_free(dlm);
> + vsp1_dl_body_pool_destroy(dlm->pool);
> }
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.h
> b/drivers/media/platform/vsp1/vsp1_dl.h index 107eebcdbab6..6a7d48e385d5
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.h
> +++ b/drivers/media/platform/vsp1/vsp1_dl.h
> @@ -41,9 +41,6 @@ void vsp1_dl_body_pool_destroy(struct vsp1_dl_body_pool
> *pool); struct vsp1_dl_body *vsp1_dl_body_get(struct vsp1_dl_body_pool
> *pool); void vsp1_dl_body_put(struct vsp1_dl_body *dlb);
>
> -struct vsp1_dl_body *vsp1_dl_body_alloc(struct vsp1_device *vsp1,
> - unsigned int num_entries);
> -void vsp1_dl_body_free(struct vsp1_dl_body *dlb);
> void vsp1_dl_body_write(struct vsp1_dl_body *dlb, u32 reg, u32 data);
> int vsp1_dl_list_add_body(struct vsp1_dl_list *dl, struct vsp1_dl_body
> *dlb); int vsp1_dl_list_add_chain(struct vsp1_dl_list *head, struct
> vsp1_dl_list *dl); diff --git a/drivers/media/platform/vsp1/vsp1_lut.c
> b/drivers/media/platform/vsp1/vsp1_lut.c index acbaca0f47f0..6b358617ce15
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_lut.c
> +++ b/drivers/media/platform/vsp1/vsp1_lut.c
> @@ -19,6 +19,8 @@
> #define LUT_MIN_SIZE 4U
> #define LUT_MAX_SIZE 8190U
>
> +#define LUT_SIZE 256
> +
> /*
> ---------------------------------------------------------------------------
> -- * Device Access
> */
> @@ -40,11 +42,11 @@ static int lut_set_table(struct vsp1_lut *lut, struct
> v4l2_ctrl *ctrl) struct vsp1_dl_body *dlb;
> unsigned int i;
>
> - dlb = vsp1_dl_body_alloc(lut->entity.vsp1, 256);
> + dlb = vsp1_dl_body_get(lut->pool);
> if (!dlb)
> return -ENOMEM;
>
> - for (i = 0; i < 256; ++i)
> + for (i = 0; i < LUT_SIZE; ++i)
> vsp1_dl_body_write(dlb, VI6_LUT_TABLE + 4 * i,
> ctrl->p_new.p_u32[i]);
>
> @@ -52,7 +54,7 @@ static int lut_set_table(struct vsp1_lut *lut, struct
> v4l2_ctrl *ctrl) swap(lut->lut, dlb);
> spin_unlock_irq(&lut->lock);
>
> - vsp1_dl_body_free(dlb);
> + vsp1_dl_body_put(dlb);
> return 0;
> }
>
> @@ -83,7 +85,7 @@ static const struct v4l2_ctrl_config lut_table_control = {
> .max = 0x00ffffff,
> .step = 1,
> .def = 0,
> - .dims = { 256},
> + .dims = { LUT_SIZE },
> };
>
> /*
> ---------------------------------------------------------------------------
> -- @@ -172,8 +174,16 @@ static void lut_configure(struct vsp1_entity
> *entity, }
> }
>
> +static void lut_destroy(struct vsp1_entity *entity)
> +{
> + struct vsp1_lut *lut = to_lut(&entity->subdev);
> +
> + vsp1_dl_body_pool_destroy(lut->pool);
> +}
> +
> static const struct vsp1_entity_operations lut_entity_ops = {
> .configure = lut_configure,
> + .destroy = lut_destroy,
> };
>
> /*
> ---------------------------------------------------------------------------
> -- @@ -199,6 +209,15 @@ struct vsp1_lut *vsp1_lut_create(struct vsp1_device
> *vsp1) if (ret < 0)
> return ERR_PTR(ret);
>
> + /*
> + * Pre-allocate a body pool, with 3 bodies allowing a userspace update
> + * before the hardware has committed a previous set of tables, handling
> + * both the queued and pending dl entries.
> + */
> + lut->pool = vsp1_dl_body_pool_create(vsp1, 3, LUT_SIZE, 0);
> + if (!lut->pool)
> + return ERR_PTR(-ENOMEM);
> +
> /* Initialize the control handler. */
> v4l2_ctrl_handler_init(&lut->ctrls, 1);
> v4l2_ctrl_new_custom(&lut->ctrls, &lut_table_control, NULL);
> diff --git a/drivers/media/platform/vsp1/vsp1_lut.h
> b/drivers/media/platform/vsp1/vsp1_lut.h index dce2fdc315f6..8cb0df1b7e27
> 100644
> --- a/drivers/media/platform/vsp1/vsp1_lut.h
> +++ b/drivers/media/platform/vsp1/vsp1_lut.h
> @@ -29,6 +29,7 @@ struct vsp1_lut {
>
> spinlock_t lock;
> struct vsp1_dl_body *lut;
> + struct vsp1_dl_body_pool *pool;
> };
>
> static inline struct vsp1_lut *to_lut(struct v4l2_subdev *subdev)
--
Regards,
Laurent Pinchart
