618 lines
18 KiB
C
618 lines
18 KiB
C
/***********************license start***************
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* Author: Cavium Networks
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*
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* Contact: support@caviumnetworks.com
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* This file is part of the OCTEON SDK
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*
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* Copyright (c) 2003-2008 Cavium Networks
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, Version 2, as
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* published by the Free Software Foundation.
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*
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* This file is distributed in the hope that it will be useful, but
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* AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
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* NONINFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this file; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* or visit http://www.gnu.org/licenses/.
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*
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* This file may also be available under a different license from Cavium.
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* Contact Cavium Networks for more information
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***********************license end**************************************/
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/*
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*
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* Support functions for managing command queues used for
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* various hardware blocks.
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*
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* The common command queue infrastructure abstracts out the
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* software necessary for adding to Octeon's chained queue
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* structures. These structures are used for commands to the
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* PKO, ZIP, DFA, RAID, and DMA engine blocks. Although each
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* hardware unit takes commands and CSRs of different types,
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* they all use basic linked command buffers to store the
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* pending request. In general, users of the CVMX API don't
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* call cvmx-cmd-queue functions directly. Instead the hardware
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* unit specific wrapper should be used. The wrappers perform
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* unit specific validation and CSR writes to submit the
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* commands.
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*
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* Even though most software will never directly interact with
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* cvmx-cmd-queue, knowledge of its internal working can help
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* in diagnosing performance problems and help with debugging.
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*
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* Command queue pointers are stored in a global named block
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* called "cvmx_cmd_queues". Except for the PKO queues, each
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* hardware queue is stored in its own cache line to reduce SMP
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* contention on spin locks. The PKO queues are stored such that
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* every 16th queue is next to each other in memory. This scheme
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* allows for queues being in separate cache lines when there
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* are low number of queues per port. With 16 queues per port,
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* the first queue for each port is in the same cache area. The
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* second queues for each port are in another area, etc. This
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* allows software to implement very efficient lockless PKO with
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* 16 queues per port using a minimum of cache lines per core.
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* All queues for a given core will be isolated in the same
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* cache area.
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*
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* In addition to the memory pointer layout, cvmx-cmd-queue
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* provides an optimized fair ll/sc locking mechanism for the
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* queues. The lock uses a "ticket / now serving" model to
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* maintain fair order on contended locks. In addition, it uses
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* predicted locking time to limit cache contention. When a core
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* know it must wait in line for a lock, it spins on the
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* internal cycle counter to completely eliminate any causes of
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* bus traffic.
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*
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*/
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#ifndef __CVMX_CMD_QUEUE_H__
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#define __CVMX_CMD_QUEUE_H__
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#include <linux/prefetch.h>
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#include "cvmx-fpa.h"
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/**
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* By default we disable the max depth support. Most programs
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* don't use it and it slows down the command queue processing
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* significantly.
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*/
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#ifndef CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH
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#define CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH 0
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#endif
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/**
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* Enumeration representing all hardware blocks that use command
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* queues. Each hardware block has up to 65536 sub identifiers for
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* multiple command queues. Not all chips support all hardware
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* units.
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*/
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typedef enum {
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CVMX_CMD_QUEUE_PKO_BASE = 0x00000,
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#define CVMX_CMD_QUEUE_PKO(queue) \
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((cvmx_cmd_queue_id_t)(CVMX_CMD_QUEUE_PKO_BASE + (0xffff&(queue))))
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CVMX_CMD_QUEUE_ZIP = 0x10000,
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CVMX_CMD_QUEUE_DFA = 0x20000,
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CVMX_CMD_QUEUE_RAID = 0x30000,
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CVMX_CMD_QUEUE_DMA_BASE = 0x40000,
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#define CVMX_CMD_QUEUE_DMA(queue) \
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((cvmx_cmd_queue_id_t)(CVMX_CMD_QUEUE_DMA_BASE + (0xffff&(queue))))
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CVMX_CMD_QUEUE_END = 0x50000,
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} cvmx_cmd_queue_id_t;
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/**
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* Command write operations can fail if the command queue needs
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* a new buffer and the associated FPA pool is empty. It can also
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* fail if the number of queued command words reaches the maximum
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* set at initialization.
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*/
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typedef enum {
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CVMX_CMD_QUEUE_SUCCESS = 0,
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CVMX_CMD_QUEUE_NO_MEMORY = -1,
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CVMX_CMD_QUEUE_FULL = -2,
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CVMX_CMD_QUEUE_INVALID_PARAM = -3,
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CVMX_CMD_QUEUE_ALREADY_SETUP = -4,
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} cvmx_cmd_queue_result_t;
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typedef struct {
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/* You have lock when this is your ticket */
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uint8_t now_serving;
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uint64_t unused1:24;
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/* Maximum outstanding command words */
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uint32_t max_depth;
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/* FPA pool buffers come from */
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uint64_t fpa_pool:3;
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/* Top of command buffer pointer shifted 7 */
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uint64_t base_ptr_div128:29;
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uint64_t unused2:6;
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/* FPA buffer size in 64bit words minus 1 */
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uint64_t pool_size_m1:13;
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/* Number of commands already used in buffer */
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uint64_t index:13;
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} __cvmx_cmd_queue_state_t;
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/**
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* This structure contains the global state of all command queues.
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* It is stored in a bootmem named block and shared by all
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* applications running on Octeon. Tickets are stored in a differnet
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* cahce line that queue information to reduce the contention on the
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* ll/sc used to get a ticket. If this is not the case, the update
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* of queue state causes the ll/sc to fail quite often.
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*/
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typedef struct {
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uint64_t ticket[(CVMX_CMD_QUEUE_END >> 16) * 256];
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__cvmx_cmd_queue_state_t state[(CVMX_CMD_QUEUE_END >> 16) * 256];
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} __cvmx_cmd_queue_all_state_t;
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/**
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* Initialize a command queue for use. The initial FPA buffer is
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* allocated and the hardware unit is configured to point to the
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* new command queue.
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*
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* @queue_id: Hardware command queue to initialize.
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* @max_depth: Maximum outstanding commands that can be queued.
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* @fpa_pool: FPA pool the command queues should come from.
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* @pool_size: Size of each buffer in the FPA pool (bytes)
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*
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* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
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*/
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cvmx_cmd_queue_result_t cvmx_cmd_queue_initialize(cvmx_cmd_queue_id_t queue_id,
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int max_depth, int fpa_pool,
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int pool_size);
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/**
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* Shutdown a queue a free it's command buffers to the FPA. The
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* hardware connected to the queue must be stopped before this
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* function is called.
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*
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* @queue_id: Queue to shutdown
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*
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* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
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*/
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cvmx_cmd_queue_result_t cvmx_cmd_queue_shutdown(cvmx_cmd_queue_id_t queue_id);
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/**
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* Return the number of command words pending in the queue. This
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* function may be relatively slow for some hardware units.
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*
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* @queue_id: Hardware command queue to query
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*
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* Returns Number of outstanding commands
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*/
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int cvmx_cmd_queue_length(cvmx_cmd_queue_id_t queue_id);
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/**
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* Return the command buffer to be written to. The purpose of this
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* function is to allow CVMX routine access t othe low level buffer
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* for initial hardware setup. User applications should not call this
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* function directly.
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*
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* @queue_id: Command queue to query
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*
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* Returns Command buffer or NULL on failure
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*/
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void *cvmx_cmd_queue_buffer(cvmx_cmd_queue_id_t queue_id);
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/**
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* Get the index into the state arrays for the supplied queue id.
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*
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* @queue_id: Queue ID to get an index for
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*
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* Returns Index into the state arrays
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*/
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static inline int __cvmx_cmd_queue_get_index(cvmx_cmd_queue_id_t queue_id)
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{
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/*
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* Warning: This code currently only works with devices that
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* have 256 queues or less. Devices with more than 16 queues
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* are laid out in memory to allow cores quick access to
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* every 16th queue. This reduces cache thrashing when you are
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* running 16 queues per port to support lockless operation.
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*/
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int unit = queue_id >> 16;
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int q = (queue_id >> 4) & 0xf;
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int core = queue_id & 0xf;
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return unit * 256 + core * 16 + q;
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}
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/**
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* Lock the supplied queue so nobody else is updating it at the same
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* time as us.
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*
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* @queue_id: Queue ID to lock
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* @qptr: Pointer to the queue's global state
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*/
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static inline void __cvmx_cmd_queue_lock(cvmx_cmd_queue_id_t queue_id,
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__cvmx_cmd_queue_state_t *qptr)
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{
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extern __cvmx_cmd_queue_all_state_t
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*__cvmx_cmd_queue_state_ptr;
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int tmp;
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int my_ticket;
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prefetch(qptr);
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asm volatile (
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".set push\n"
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".set noreorder\n"
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"1:\n"
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/* Atomic add one to ticket_ptr */
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"ll %[my_ticket], %[ticket_ptr]\n"
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/* and store the original value */
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"li %[ticket], 1\n"
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/* in my_ticket */
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"baddu %[ticket], %[my_ticket]\n"
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"sc %[ticket], %[ticket_ptr]\n"
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"beqz %[ticket], 1b\n"
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" nop\n"
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/* Load the current now_serving ticket */
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"lbu %[ticket], %[now_serving]\n"
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"2:\n"
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/* Jump out if now_serving == my_ticket */
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"beq %[ticket], %[my_ticket], 4f\n"
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/* Find out how many tickets are in front of me */
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" subu %[ticket], %[my_ticket], %[ticket]\n"
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/* Use tickets in front of me minus one to delay */
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"subu %[ticket], 1\n"
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/* Delay will be ((tickets in front)-1)*32 loops */
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"cins %[ticket], %[ticket], 5, 7\n"
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"3:\n"
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/* Loop here until our ticket might be up */
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"bnez %[ticket], 3b\n"
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" subu %[ticket], 1\n"
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/* Jump back up to check out ticket again */
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"b 2b\n"
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/* Load the current now_serving ticket */
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" lbu %[ticket], %[now_serving]\n"
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"4:\n"
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".set pop\n" :
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[ticket_ptr] "=m"(__cvmx_cmd_queue_state_ptr->ticket[__cvmx_cmd_queue_get_index(queue_id)]),
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[now_serving] "=m"(qptr->now_serving), [ticket] "=r"(tmp),
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[my_ticket] "=r"(my_ticket)
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);
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}
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/**
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* Unlock the queue, flushing all writes.
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*
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* @qptr: Queue to unlock
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*/
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static inline void __cvmx_cmd_queue_unlock(__cvmx_cmd_queue_state_t *qptr)
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{
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qptr->now_serving++;
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CVMX_SYNCWS;
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}
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/**
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* Get the queue state structure for the given queue id
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*
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* @queue_id: Queue id to get
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*
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* Returns Queue structure or NULL on failure
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*/
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static inline __cvmx_cmd_queue_state_t
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*__cvmx_cmd_queue_get_state(cvmx_cmd_queue_id_t queue_id)
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{
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extern __cvmx_cmd_queue_all_state_t
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*__cvmx_cmd_queue_state_ptr;
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return &__cvmx_cmd_queue_state_ptr->
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state[__cvmx_cmd_queue_get_index(queue_id)];
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}
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/**
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* Write an arbitrary number of command words to a command queue.
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* This is a generic function; the fixed number of command word
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* functions yield higher performance.
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*
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* @queue_id: Hardware command queue to write to
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* @use_locking:
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* Use internal locking to ensure exclusive access for queue
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* updates. If you don't use this locking you must ensure
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* exclusivity some other way. Locking is strongly recommended.
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* @cmd_count: Number of command words to write
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* @cmds: Array of commands to write
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*
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* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
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*/
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static inline cvmx_cmd_queue_result_t cvmx_cmd_queue_write(cvmx_cmd_queue_id_t
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queue_id,
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int use_locking,
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int cmd_count,
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uint64_t *cmds)
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{
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__cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
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/* Make sure nobody else is updating the same queue */
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if (likely(use_locking))
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__cvmx_cmd_queue_lock(queue_id, qptr);
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/*
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* If a max queue length was specified then make sure we don't
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* exceed it. If any part of the command would be below the
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* limit we allow it.
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*/
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if (CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH && unlikely(qptr->max_depth)) {
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if (unlikely
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(cvmx_cmd_queue_length(queue_id) > (int)qptr->max_depth)) {
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if (likely(use_locking))
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__cvmx_cmd_queue_unlock(qptr);
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return CVMX_CMD_QUEUE_FULL;
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}
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}
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/*
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* Normally there is plenty of room in the current buffer for
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* the command.
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*/
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if (likely(qptr->index + cmd_count < qptr->pool_size_m1)) {
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uint64_t *ptr =
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(uint64_t *) cvmx_phys_to_ptr((uint64_t) qptr->
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base_ptr_div128 << 7);
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ptr += qptr->index;
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qptr->index += cmd_count;
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while (cmd_count--)
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*ptr++ = *cmds++;
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} else {
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uint64_t *ptr;
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int count;
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/*
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* We need a new command buffer. Fail if there isn't
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* one available.
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*/
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uint64_t *new_buffer =
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(uint64_t *) cvmx_fpa_alloc(qptr->fpa_pool);
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if (unlikely(new_buffer == NULL)) {
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if (likely(use_locking))
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__cvmx_cmd_queue_unlock(qptr);
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return CVMX_CMD_QUEUE_NO_MEMORY;
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}
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ptr =
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(uint64_t *) cvmx_phys_to_ptr((uint64_t) qptr->
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base_ptr_div128 << 7);
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/*
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* Figure out how many command words will fit in this
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* buffer. One location will be needed for the next
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* buffer pointer.
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*/
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count = qptr->pool_size_m1 - qptr->index;
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ptr += qptr->index;
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cmd_count -= count;
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while (count--)
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*ptr++ = *cmds++;
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*ptr = cvmx_ptr_to_phys(new_buffer);
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/*
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* The current buffer is full and has a link to the
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* next buffer. Time to write the rest of the commands
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* into the new buffer.
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*/
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qptr->base_ptr_div128 = *ptr >> 7;
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qptr->index = cmd_count;
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ptr = new_buffer;
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while (cmd_count--)
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*ptr++ = *cmds++;
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}
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/* All updates are complete. Release the lock and return */
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if (likely(use_locking))
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__cvmx_cmd_queue_unlock(qptr);
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return CVMX_CMD_QUEUE_SUCCESS;
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}
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/**
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* Simple function to write two command words to a command
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* queue.
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*
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* @queue_id: Hardware command queue to write to
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* @use_locking:
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* Use internal locking to ensure exclusive access for queue
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* updates. If you don't use this locking you must ensure
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* exclusivity some other way. Locking is strongly recommended.
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* @cmd1: Command
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* @cmd2: Command
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*
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* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
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*/
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static inline cvmx_cmd_queue_result_t cvmx_cmd_queue_write2(cvmx_cmd_queue_id_t
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queue_id,
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int use_locking,
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uint64_t cmd1,
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uint64_t cmd2)
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{
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__cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
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/* Make sure nobody else is updating the same queue */
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if (likely(use_locking))
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__cvmx_cmd_queue_lock(queue_id, qptr);
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/*
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* If a max queue length was specified then make sure we don't
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* exceed it. If any part of the command would be below the
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* limit we allow it.
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*/
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if (CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH && unlikely(qptr->max_depth)) {
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if (unlikely
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(cvmx_cmd_queue_length(queue_id) > (int)qptr->max_depth)) {
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if (likely(use_locking))
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__cvmx_cmd_queue_unlock(qptr);
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return CVMX_CMD_QUEUE_FULL;
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}
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}
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/*
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* Normally there is plenty of room in the current buffer for
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* the command.
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*/
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if (likely(qptr->index + 2 < qptr->pool_size_m1)) {
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uint64_t *ptr =
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(uint64_t *) cvmx_phys_to_ptr((uint64_t) qptr->
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base_ptr_div128 << 7);
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ptr += qptr->index;
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qptr->index += 2;
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ptr[0] = cmd1;
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ptr[1] = cmd2;
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} else {
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uint64_t *ptr;
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/*
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* Figure out how many command words will fit in this
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* buffer. One location will be needed for the next
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* buffer pointer.
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*/
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int count = qptr->pool_size_m1 - qptr->index;
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/*
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* We need a new command buffer. Fail if there isn't
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* one available.
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*/
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uint64_t *new_buffer =
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(uint64_t *) cvmx_fpa_alloc(qptr->fpa_pool);
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if (unlikely(new_buffer == NULL)) {
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if (likely(use_locking))
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__cvmx_cmd_queue_unlock(qptr);
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return CVMX_CMD_QUEUE_NO_MEMORY;
|
|
}
|
|
count--;
|
|
ptr =
|
|
(uint64_t *) cvmx_phys_to_ptr((uint64_t) qptr->
|
|
base_ptr_div128 << 7);
|
|
ptr += qptr->index;
|
|
*ptr++ = cmd1;
|
|
if (likely(count))
|
|
*ptr++ = cmd2;
|
|
*ptr = cvmx_ptr_to_phys(new_buffer);
|
|
/*
|
|
* The current buffer is full and has a link to the
|
|
* next buffer. Time to write the rest of the commands
|
|
* into the new buffer.
|
|
*/
|
|
qptr->base_ptr_div128 = *ptr >> 7;
|
|
qptr->index = 0;
|
|
if (unlikely(count == 0)) {
|
|
qptr->index = 1;
|
|
new_buffer[0] = cmd2;
|
|
}
|
|
}
|
|
|
|
/* All updates are complete. Release the lock and return */
|
|
if (likely(use_locking))
|
|
__cvmx_cmd_queue_unlock(qptr);
|
|
return CVMX_CMD_QUEUE_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Simple function to write three command words to a command
|
|
* queue.
|
|
*
|
|
* @queue_id: Hardware command queue to write to
|
|
* @use_locking:
|
|
* Use internal locking to ensure exclusive access for queue
|
|
* updates. If you don't use this locking you must ensure
|
|
* exclusivity some other way. Locking is strongly recommended.
|
|
* @cmd1: Command
|
|
* @cmd2: Command
|
|
* @cmd3: Command
|
|
*
|
|
* Returns CVMX_CMD_QUEUE_SUCCESS or a failure code
|
|
*/
|
|
static inline cvmx_cmd_queue_result_t cvmx_cmd_queue_write3(cvmx_cmd_queue_id_t
|
|
queue_id,
|
|
int use_locking,
|
|
uint64_t cmd1,
|
|
uint64_t cmd2,
|
|
uint64_t cmd3)
|
|
{
|
|
__cvmx_cmd_queue_state_t *qptr = __cvmx_cmd_queue_get_state(queue_id);
|
|
|
|
/* Make sure nobody else is updating the same queue */
|
|
if (likely(use_locking))
|
|
__cvmx_cmd_queue_lock(queue_id, qptr);
|
|
|
|
/*
|
|
* If a max queue length was specified then make sure we don't
|
|
* exceed it. If any part of the command would be below the
|
|
* limit we allow it.
|
|
*/
|
|
if (CVMX_CMD_QUEUE_ENABLE_MAX_DEPTH && unlikely(qptr->max_depth)) {
|
|
if (unlikely
|
|
(cvmx_cmd_queue_length(queue_id) > (int)qptr->max_depth)) {
|
|
if (likely(use_locking))
|
|
__cvmx_cmd_queue_unlock(qptr);
|
|
return CVMX_CMD_QUEUE_FULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Normally there is plenty of room in the current buffer for
|
|
* the command.
|
|
*/
|
|
if (likely(qptr->index + 3 < qptr->pool_size_m1)) {
|
|
uint64_t *ptr =
|
|
(uint64_t *) cvmx_phys_to_ptr((uint64_t) qptr->
|
|
base_ptr_div128 << 7);
|
|
ptr += qptr->index;
|
|
qptr->index += 3;
|
|
ptr[0] = cmd1;
|
|
ptr[1] = cmd2;
|
|
ptr[2] = cmd3;
|
|
} else {
|
|
uint64_t *ptr;
|
|
/*
|
|
* Figure out how many command words will fit in this
|
|
* buffer. One location will be needed for the next
|
|
* buffer pointer
|
|
*/
|
|
int count = qptr->pool_size_m1 - qptr->index;
|
|
/*
|
|
* We need a new command buffer. Fail if there isn't
|
|
* one available
|
|
*/
|
|
uint64_t *new_buffer =
|
|
(uint64_t *) cvmx_fpa_alloc(qptr->fpa_pool);
|
|
if (unlikely(new_buffer == NULL)) {
|
|
if (likely(use_locking))
|
|
__cvmx_cmd_queue_unlock(qptr);
|
|
return CVMX_CMD_QUEUE_NO_MEMORY;
|
|
}
|
|
count--;
|
|
ptr =
|
|
(uint64_t *) cvmx_phys_to_ptr((uint64_t) qptr->
|
|
base_ptr_div128 << 7);
|
|
ptr += qptr->index;
|
|
*ptr++ = cmd1;
|
|
if (count) {
|
|
*ptr++ = cmd2;
|
|
if (count > 1)
|
|
*ptr++ = cmd3;
|
|
}
|
|
*ptr = cvmx_ptr_to_phys(new_buffer);
|
|
/*
|
|
* The current buffer is full and has a link to the
|
|
* next buffer. Time to write the rest of the commands
|
|
* into the new buffer.
|
|
*/
|
|
qptr->base_ptr_div128 = *ptr >> 7;
|
|
qptr->index = 0;
|
|
ptr = new_buffer;
|
|
if (count == 0) {
|
|
*ptr++ = cmd2;
|
|
qptr->index++;
|
|
}
|
|
if (count < 2) {
|
|
*ptr++ = cmd3;
|
|
qptr->index++;
|
|
}
|
|
}
|
|
|
|
/* All updates are complete. Release the lock and return */
|
|
if (likely(use_locking))
|
|
__cvmx_cmd_queue_unlock(qptr);
|
|
return CVMX_CMD_QUEUE_SUCCESS;
|
|
}
|
|
|
|
#endif /* __CVMX_CMD_QUEUE_H__ */
|