[PATCH v5 09/11] media: vsp1: Provide support for extended command pools
Kieran Bingham
kieran at bingham.xyz
Tue Jul 17 20:35:51 UTC 2018
From: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
VSPD and VSP-DL devices can provide extended display lists supporting
extended command display list objects.
These extended commands require their own dma memory areas for a header
and body specific to the command type.
Implement a command pool to allocate all necessary memory in a single
DMA allocation to reduce pressure on the TLB, and provide convenient
re-usable command objects for the entities to utilise.
Signed-off-by: Kieran Bingham <kieran.bingham+renesas at ideasonboard.com>
---
v2:
- Fix spelling typo in commit message
- constify, and staticify the instantiation of vsp1_extended_commands
- s/autfld_cmds/autofld_cmds/
- staticify cmd pool functions (Thanks kbuild-bot)
v5:
- Rename vsp1_dl_ext_cmd_header -> vsp1_pre_ext_dl_body
- fixup vsp1_cmd_pool structure documentation
- Rename dlm->autofld_cmds dlm->cmdpool
- Separate out the instatiation of vsp1_extended_commands
- Move initialisation of lock, and lists in vsp1_dl_cmd_pool_create to
immediately after allocation
- simplify vsp1_dlm_get_autofld_cmd
- Rename vsp1_dl_get_autofld_cmd() to vsp1_dl_get_pre_cmd() and moved
to "Display List Extended Command Management" section of vsp1_dl
drivers/media/platform/vsp1/vsp1_dl.c | 194 +++++++++++++++++++++++++++-
drivers/media/platform/vsp1/vsp1_dl.h | 3 +-
2 files changed, 197 insertions(+)
diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
index 2fffe977aa35..d5b3c24d160c 100644
--- a/drivers/media/platform/vsp1/vsp1_dl.c
+++ b/drivers/media/platform/vsp1/vsp1_dl.c
@@ -141,6 +141,30 @@ struct vsp1_dl_body_pool {
};
/**
+ * struct vsp1_cmd_pool - Display List commands pool
+ * @dma: DMA address of the entries
+ * @size: size of the full DMA memory pool in bytes
+ * @mem: CPU memory pointer for the pool
+ * @cmds: Array of command structures for the pool
+ * @free: Free pool entries
+ * @lock: Protects the free list
+ * @vsp1: the VSP1 device
+ */
+struct vsp1_dl_cmd_pool {
+ /* DMA allocation */
+ dma_addr_t dma;
+ size_t size;
+ void *mem;
+
+ struct vsp1_dl_ext_cmd *cmds;
+ struct list_head free;
+
+ spinlock_t lock;
+
+ struct vsp1_device *vsp1;
+};
+
+/**
* struct vsp1_dl_list - Display list
* @list: entry in the display list manager lists
* @dlm: the display list manager
@@ -186,6 +210,7 @@ struct vsp1_dl_list {
* @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
+ * @autofld_cmds: command pool to support auto-fld interlaced mode
*/
struct vsp1_dl_manager {
unsigned int index;
@@ -199,6 +224,7 @@ struct vsp1_dl_manager {
struct vsp1_dl_list *pending;
struct vsp1_dl_body_pool *pool;
+ struct vsp1_dl_cmd_pool *cmdpool;
};
/* -----------------------------------------------------------------------------
@@ -362,6 +388,157 @@ void vsp1_dl_body_write(struct vsp1_dl_body *dlb, u32 reg, u32 data)
}
/* -----------------------------------------------------------------------------
+ * Display List Extended Command Management
+ */
+
+enum vsp1_extcmd_type {
+ VSP1_EXTCMD_AUTODISP,
+ VSP1_EXTCMD_AUTOFLD,
+};
+
+struct vsp1_extended_command_info {
+ u16 opcode;
+ size_t body_size;
+};
+
+static const struct vsp1_extended_command_info vsp1_extended_commands[] = {
+ [VSP1_EXTCMD_AUTODISP] = { 0x02, 96 },
+ [VSP1_EXTCMD_AUTOFLD] = { 0x03, 160 },
+};
+
+/**
+ * vsp1_dl_cmd_pool_create - Create a pool of commands from a single allocation
+ * @vsp1: The VSP1 device
+ * @type: The command pool type
+ * @num_cmds: The number of commands to allocate
+ *
+ * Allocate a pool of commands each with enough memory to contain the private
+ * data of each command. The allocation sizes are dependent upon the command
+ * type.
+ *
+ * Return a pointer to the pool on success or NULL if memory can't be allocated.
+ */
+static struct vsp1_dl_cmd_pool *
+vsp1_dl_cmd_pool_create(struct vsp1_device *vsp1, enum vsp1_extcmd_type type,
+ unsigned int num_cmds)
+{
+ struct vsp1_dl_cmd_pool *pool;
+ unsigned int i;
+ size_t cmd_size;
+
+ pool = kzalloc(sizeof(*pool), GFP_KERNEL);
+ if (!pool)
+ return NULL;
+
+ spin_lock_init(&pool->lock);
+ INIT_LIST_HEAD(&pool->free);
+
+ pool->cmds = kcalloc(num_cmds, sizeof(*pool->cmds), GFP_KERNEL);
+ if (!pool->cmds) {
+ kfree(pool);
+ return NULL;
+ }
+
+ cmd_size = sizeof(struct vsp1_pre_ext_dl_body) +
+ vsp1_extended_commands[type].body_size;
+ cmd_size = ALIGN(cmd_size, 16);
+
+ pool->size = cmd_size * num_cmds;
+ pool->mem = dma_alloc_wc(vsp1->bus_master, pool->size, &pool->dma,
+ GFP_KERNEL);
+ if (!pool->mem) {
+ kfree(pool->cmds);
+ kfree(pool);
+ return NULL;
+ }
+
+ for (i = 0; i < num_cmds; ++i) {
+ struct vsp1_dl_ext_cmd *cmd = &pool->cmds[i];
+ size_t cmd_offset = i * cmd_size;
+ /* data_offset must be 16 byte aligned for DMA. */
+ size_t data_offset = sizeof(struct vsp1_pre_ext_dl_body) +
+ cmd_offset;
+
+ cmd->pool = pool;
+ cmd->opcode = vsp1_extended_commands[type].opcode;
+
+ /*
+ * TODO: Auto-disp can utilise more than one extended body
+ * command per cmd.
+ */
+ cmd->num_cmds = 1;
+ cmd->cmds = pool->mem + cmd_offset;
+ cmd->cmd_dma = pool->dma + cmd_offset;
+
+ cmd->data = pool->mem + data_offset;
+ cmd->data_dma = pool->dma + data_offset;
+
+ list_add_tail(&cmd->free, &pool->free);
+ }
+
+ return pool;
+}
+
+static
+struct vsp1_dl_ext_cmd *vsp1_dl_ext_cmd_get(struct vsp1_dl_cmd_pool *pool)
+{
+ struct vsp1_dl_ext_cmd *cmd = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pool->lock, flags);
+
+ if (!list_empty(&pool->free)) {
+ cmd = list_first_entry(&pool->free, struct vsp1_dl_ext_cmd,
+ free);
+ list_del(&cmd->free);
+ }
+
+ spin_unlock_irqrestore(&pool->lock, flags);
+
+ return cmd;
+}
+
+static void vsp1_dl_ext_cmd_put(struct vsp1_dl_ext_cmd *cmd)
+{
+ unsigned long flags;
+
+ if (!cmd)
+ return;
+
+ /* Reset flags, these mark data usage. */
+ cmd->flags = 0;
+
+ spin_lock_irqsave(&cmd->pool->lock, flags);
+ list_add_tail(&cmd->free, &cmd->pool->free);
+ spin_unlock_irqrestore(&cmd->pool->lock, flags);
+}
+
+static void vsp1_dl_ext_cmd_pool_destroy(struct vsp1_dl_cmd_pool *pool)
+{
+ if (!pool)
+ return;
+
+ if (pool->mem)
+ dma_free_wc(pool->vsp1->bus_master, pool->size, pool->mem,
+ pool->dma);
+
+ kfree(pool->cmds);
+ kfree(pool);
+}
+
+struct vsp1_dl_ext_cmd *vsp1_dl_get_pre_cmd(struct vsp1_dl_list *dl)
+{
+ struct vsp1_dl_manager *dlm = dl->dlm;
+
+ if (dl->pre_cmd)
+ return dl->pre_cmd;
+
+ dl->pre_cmd = vsp1_dl_ext_cmd_get(dlm->cmdpool);
+
+ return dl->pre_cmd;
+}
+
+/* ----------------------------------------------------------------------------
* Display List Transaction Management
*/
@@ -463,6 +640,12 @@ static void __vsp1_dl_list_put(struct vsp1_dl_list *dl)
vsp1_dl_list_bodies_put(dl);
+ vsp1_dl_ext_cmd_put(dl->pre_cmd);
+ vsp1_dl_ext_cmd_put(dl->post_cmd);
+
+ dl->pre_cmd = NULL;
+ dl->post_cmd = NULL;
+
/*
* body0 is reused as as an optimisation as presently every display list
* has at least one body, thus we reinitialise the entries list.
@@ -913,6 +1096,15 @@ struct vsp1_dl_manager *vsp1_dlm_create(struct vsp1_device *vsp1,
list_add_tail(&dl->list, &dlm->free);
}
+ if (vsp1_feature(vsp1, VSP1_HAS_EXT_DL)) {
+ dlm->cmdpool = vsp1_dl_cmd_pool_create(vsp1,
+ VSP1_EXTCMD_AUTOFLD, prealloc);
+ if (!dlm->cmdpool) {
+ vsp1_dlm_destroy(dlm);
+ return NULL;
+ }
+ }
+
return dlm;
}
@@ -929,4 +1121,6 @@ void vsp1_dlm_destroy(struct vsp1_dl_manager *dlm)
}
vsp1_dl_body_pool_destroy(dlm->pool);
+ vsp1_dl_ext_cmd_pool_destroy(dlm->cmdpool);
}
+
diff --git a/drivers/media/platform/vsp1/vsp1_dl.h b/drivers/media/platform/vsp1/vsp1_dl.h
index afefd5bfa136..125750dc8b5c 100644
--- a/drivers/media/platform/vsp1/vsp1_dl.h
+++ b/drivers/media/platform/vsp1/vsp1_dl.h
@@ -22,6 +22,7 @@ struct vsp1_dl_manager;
/**
* struct vsp1_dl_ext_cmd - Extended Display command
+ * @pool: pool to which this command belongs
* @free: entry in the pool of free commands list
* @opcode: command type opcode
* @flags: flags used by the command
@@ -32,6 +33,7 @@ struct vsp1_dl_manager;
* @data_dma: DMA address for command-specific data
*/
struct vsp1_dl_ext_cmd {
+ struct vsp1_dl_cmd_pool *pool;
struct list_head free;
u8 opcode;
@@ -58,6 +60,7 @@ struct vsp1_dl_body *vsp1_dlm_dl_body_get(struct vsp1_dl_manager *dlm);
struct vsp1_dl_list *vsp1_dl_list_get(struct vsp1_dl_manager *dlm);
void vsp1_dl_list_put(struct vsp1_dl_list *dl);
struct vsp1_dl_body *vsp1_dl_list_get_body0(struct vsp1_dl_list *dl);
+struct vsp1_dl_ext_cmd *vsp1_dl_get_pre_cmd(struct vsp1_dl_list *dl);
void vsp1_dl_list_commit(struct vsp1_dl_list *dl, bool internal);
struct vsp1_dl_body_pool *
--
git-series 0.9.1
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