1103 lines
27 KiB
C
1103 lines
27 KiB
C
/*
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* Filename: dma.c
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*
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*
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* Authors: Joshua Morris <josh.h.morris@us.ibm.com>
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* Philip Kelleher <pjk1939@linux.vnet.ibm.com>
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*
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* (C) Copyright 2013 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more 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 program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/slab.h>
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#include "rsxx_priv.h"
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struct rsxx_dma {
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struct list_head list;
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u8 cmd;
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unsigned int laddr; /* Logical address */
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struct {
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u32 off;
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u32 cnt;
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} sub_page;
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dma_addr_t dma_addr;
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struct page *page;
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unsigned int pg_off; /* Page Offset */
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rsxx_dma_cb cb;
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void *cb_data;
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};
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/* This timeout is used to detect a stalled DMA channel */
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#define DMA_ACTIVITY_TIMEOUT msecs_to_jiffies(10000)
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struct hw_status {
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u8 status;
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u8 tag;
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__le16 count;
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__le32 _rsvd2;
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__le64 _rsvd3;
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} __packed;
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enum rsxx_dma_status {
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DMA_SW_ERR = 0x1,
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DMA_HW_FAULT = 0x2,
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DMA_CANCELLED = 0x4,
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};
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struct hw_cmd {
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u8 command;
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u8 tag;
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u8 _rsvd;
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u8 sub_page; /* Bit[0:2]: 512byte offset */
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/* Bit[4:6]: 512byte count */
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__le32 device_addr;
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__le64 host_addr;
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} __packed;
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enum rsxx_hw_cmd {
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HW_CMD_BLK_DISCARD = 0x70,
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HW_CMD_BLK_WRITE = 0x80,
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HW_CMD_BLK_READ = 0xC0,
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HW_CMD_BLK_RECON_READ = 0xE0,
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};
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enum rsxx_hw_status {
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HW_STATUS_CRC = 0x01,
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HW_STATUS_HARD_ERR = 0x02,
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HW_STATUS_SOFT_ERR = 0x04,
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HW_STATUS_FAULT = 0x08,
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};
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static struct kmem_cache *rsxx_dma_pool;
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struct dma_tracker {
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int next_tag;
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struct rsxx_dma *dma;
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};
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#define DMA_TRACKER_LIST_SIZE8 (sizeof(struct dma_tracker_list) + \
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(sizeof(struct dma_tracker) * RSXX_MAX_OUTSTANDING_CMDS))
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struct dma_tracker_list {
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spinlock_t lock;
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int head;
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struct dma_tracker list[0];
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};
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/*----------------- Misc Utility Functions -------------------*/
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static unsigned int rsxx_addr8_to_laddr(u64 addr8, struct rsxx_cardinfo *card)
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{
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unsigned long long tgt_addr8;
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tgt_addr8 = ((addr8 >> card->_stripe.upper_shift) &
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card->_stripe.upper_mask) |
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((addr8) & card->_stripe.lower_mask);
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do_div(tgt_addr8, RSXX_HW_BLK_SIZE);
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return tgt_addr8;
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}
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static unsigned int rsxx_get_dma_tgt(struct rsxx_cardinfo *card, u64 addr8)
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{
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unsigned int tgt;
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tgt = (addr8 >> card->_stripe.target_shift) & card->_stripe.target_mask;
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return tgt;
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}
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void rsxx_dma_queue_reset(struct rsxx_cardinfo *card)
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{
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/* Reset all DMA Command/Status Queues */
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iowrite32(DMA_QUEUE_RESET, card->regmap + RESET);
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}
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static unsigned int get_dma_size(struct rsxx_dma *dma)
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{
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if (dma->sub_page.cnt)
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return dma->sub_page.cnt << 9;
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else
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return RSXX_HW_BLK_SIZE;
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}
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/*----------------- DMA Tracker -------------------*/
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static void set_tracker_dma(struct dma_tracker_list *trackers,
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int tag,
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struct rsxx_dma *dma)
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{
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trackers->list[tag].dma = dma;
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}
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static struct rsxx_dma *get_tracker_dma(struct dma_tracker_list *trackers,
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int tag)
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{
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return trackers->list[tag].dma;
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}
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static int pop_tracker(struct dma_tracker_list *trackers)
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{
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int tag;
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spin_lock(&trackers->lock);
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tag = trackers->head;
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if (tag != -1) {
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trackers->head = trackers->list[tag].next_tag;
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trackers->list[tag].next_tag = -1;
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}
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spin_unlock(&trackers->lock);
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return tag;
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}
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static void push_tracker(struct dma_tracker_list *trackers, int tag)
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{
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spin_lock(&trackers->lock);
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trackers->list[tag].next_tag = trackers->head;
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trackers->head = tag;
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trackers->list[tag].dma = NULL;
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spin_unlock(&trackers->lock);
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}
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/*----------------- Interrupt Coalescing -------------*/
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/*
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* Interrupt Coalescing Register Format:
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* Interrupt Timer (64ns units) [15:0]
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* Interrupt Count [24:16]
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* Reserved [31:25]
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*/
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#define INTR_COAL_LATENCY_MASK (0x0000ffff)
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#define INTR_COAL_COUNT_SHIFT 16
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#define INTR_COAL_COUNT_BITS 9
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#define INTR_COAL_COUNT_MASK (((1 << INTR_COAL_COUNT_BITS) - 1) << \
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INTR_COAL_COUNT_SHIFT)
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#define INTR_COAL_LATENCY_UNITS_NS 64
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static u32 dma_intr_coal_val(u32 mode, u32 count, u32 latency)
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{
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u32 latency_units = latency / INTR_COAL_LATENCY_UNITS_NS;
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if (mode == RSXX_INTR_COAL_DISABLED)
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return 0;
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return ((count << INTR_COAL_COUNT_SHIFT) & INTR_COAL_COUNT_MASK) |
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(latency_units & INTR_COAL_LATENCY_MASK);
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}
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static void dma_intr_coal_auto_tune(struct rsxx_cardinfo *card)
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{
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int i;
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u32 q_depth = 0;
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u32 intr_coal;
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if (card->config.data.intr_coal.mode != RSXX_INTR_COAL_AUTO_TUNE ||
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unlikely(card->eeh_state))
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return;
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for (i = 0; i < card->n_targets; i++)
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q_depth += atomic_read(&card->ctrl[i].stats.hw_q_depth);
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intr_coal = dma_intr_coal_val(card->config.data.intr_coal.mode,
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q_depth / 2,
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card->config.data.intr_coal.latency);
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iowrite32(intr_coal, card->regmap + INTR_COAL);
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}
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/*----------------- RSXX DMA Handling -------------------*/
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static void rsxx_free_dma(struct rsxx_dma_ctrl *ctrl, struct rsxx_dma *dma)
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{
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if (dma->cmd != HW_CMD_BLK_DISCARD) {
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if (!pci_dma_mapping_error(ctrl->card->dev, dma->dma_addr)) {
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pci_unmap_page(ctrl->card->dev, dma->dma_addr,
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get_dma_size(dma),
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dma->cmd == HW_CMD_BLK_WRITE ?
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PCI_DMA_TODEVICE :
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PCI_DMA_FROMDEVICE);
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}
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}
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kmem_cache_free(rsxx_dma_pool, dma);
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}
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static void rsxx_complete_dma(struct rsxx_dma_ctrl *ctrl,
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struct rsxx_dma *dma,
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unsigned int status)
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{
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if (status & DMA_SW_ERR)
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ctrl->stats.dma_sw_err++;
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if (status & DMA_HW_FAULT)
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ctrl->stats.dma_hw_fault++;
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if (status & DMA_CANCELLED)
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ctrl->stats.dma_cancelled++;
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if (dma->cb)
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dma->cb(ctrl->card, dma->cb_data, status ? 1 : 0);
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rsxx_free_dma(ctrl, dma);
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}
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int rsxx_cleanup_dma_queue(struct rsxx_dma_ctrl *ctrl,
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struct list_head *q, unsigned int done)
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{
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struct rsxx_dma *dma;
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struct rsxx_dma *tmp;
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int cnt = 0;
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list_for_each_entry_safe(dma, tmp, q, list) {
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list_del(&dma->list);
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if (done & COMPLETE_DMA)
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rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
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else
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rsxx_free_dma(ctrl, dma);
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cnt++;
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}
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return cnt;
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}
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static void rsxx_requeue_dma(struct rsxx_dma_ctrl *ctrl,
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struct rsxx_dma *dma)
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{
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/*
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* Requeued DMAs go to the front of the queue so they are issued
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* first.
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*/
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spin_lock_bh(&ctrl->queue_lock);
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ctrl->stats.sw_q_depth++;
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list_add(&dma->list, &ctrl->queue);
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spin_unlock_bh(&ctrl->queue_lock);
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}
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static void rsxx_handle_dma_error(struct rsxx_dma_ctrl *ctrl,
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struct rsxx_dma *dma,
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u8 hw_st)
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{
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unsigned int status = 0;
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int requeue_cmd = 0;
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dev_dbg(CARD_TO_DEV(ctrl->card),
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"Handling DMA error(cmd x%02x, laddr x%08x st:x%02x)\n",
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dma->cmd, dma->laddr, hw_st);
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if (hw_st & HW_STATUS_CRC)
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ctrl->stats.crc_errors++;
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if (hw_st & HW_STATUS_HARD_ERR)
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ctrl->stats.hard_errors++;
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if (hw_st & HW_STATUS_SOFT_ERR)
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ctrl->stats.soft_errors++;
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switch (dma->cmd) {
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case HW_CMD_BLK_READ:
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if (hw_st & (HW_STATUS_CRC | HW_STATUS_HARD_ERR)) {
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if (ctrl->card->scrub_hard) {
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dma->cmd = HW_CMD_BLK_RECON_READ;
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requeue_cmd = 1;
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ctrl->stats.reads_retried++;
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} else {
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status |= DMA_HW_FAULT;
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ctrl->stats.reads_failed++;
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}
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} else if (hw_st & HW_STATUS_FAULT) {
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status |= DMA_HW_FAULT;
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ctrl->stats.reads_failed++;
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}
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break;
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case HW_CMD_BLK_RECON_READ:
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if (hw_st & (HW_STATUS_CRC | HW_STATUS_HARD_ERR)) {
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/* Data could not be reconstructed. */
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status |= DMA_HW_FAULT;
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ctrl->stats.reads_failed++;
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}
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break;
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case HW_CMD_BLK_WRITE:
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status |= DMA_HW_FAULT;
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ctrl->stats.writes_failed++;
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break;
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case HW_CMD_BLK_DISCARD:
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status |= DMA_HW_FAULT;
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ctrl->stats.discards_failed++;
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break;
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default:
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dev_err(CARD_TO_DEV(ctrl->card),
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"Unknown command in DMA!(cmd: x%02x "
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"laddr x%08x st: x%02x\n",
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dma->cmd, dma->laddr, hw_st);
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status |= DMA_SW_ERR;
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break;
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}
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if (requeue_cmd)
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rsxx_requeue_dma(ctrl, dma);
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else
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rsxx_complete_dma(ctrl, dma, status);
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}
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static void dma_engine_stalled(struct timer_list *t)
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{
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struct rsxx_dma_ctrl *ctrl = from_timer(ctrl, t, activity_timer);
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int cnt;
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if (atomic_read(&ctrl->stats.hw_q_depth) == 0 ||
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unlikely(ctrl->card->eeh_state))
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return;
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if (ctrl->cmd.idx != ioread32(ctrl->regmap + SW_CMD_IDX)) {
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/*
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* The dma engine was stalled because the SW_CMD_IDX write
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* was lost. Issue it again to recover.
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*/
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dev_warn(CARD_TO_DEV(ctrl->card),
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"SW_CMD_IDX write was lost, re-writing...\n");
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iowrite32(ctrl->cmd.idx, ctrl->regmap + SW_CMD_IDX);
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mod_timer(&ctrl->activity_timer,
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jiffies + DMA_ACTIVITY_TIMEOUT);
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} else {
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dev_warn(CARD_TO_DEV(ctrl->card),
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"DMA channel %d has stalled, faulting interface.\n",
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ctrl->id);
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ctrl->card->dma_fault = 1;
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/* Clean up the DMA queue */
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spin_lock(&ctrl->queue_lock);
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cnt = rsxx_cleanup_dma_queue(ctrl, &ctrl->queue, COMPLETE_DMA);
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spin_unlock(&ctrl->queue_lock);
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cnt += rsxx_dma_cancel(ctrl);
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if (cnt)
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dev_info(CARD_TO_DEV(ctrl->card),
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"Freed %d queued DMAs on channel %d\n",
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cnt, ctrl->id);
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}
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}
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static void rsxx_issue_dmas(struct rsxx_dma_ctrl *ctrl)
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{
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struct rsxx_dma *dma;
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int tag;
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int cmds_pending = 0;
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struct hw_cmd *hw_cmd_buf;
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int dir;
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hw_cmd_buf = ctrl->cmd.buf;
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if (unlikely(ctrl->card->halt) ||
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unlikely(ctrl->card->eeh_state))
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return;
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while (1) {
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spin_lock_bh(&ctrl->queue_lock);
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if (list_empty(&ctrl->queue)) {
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spin_unlock_bh(&ctrl->queue_lock);
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break;
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}
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spin_unlock_bh(&ctrl->queue_lock);
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tag = pop_tracker(ctrl->trackers);
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if (tag == -1)
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break;
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spin_lock_bh(&ctrl->queue_lock);
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dma = list_entry(ctrl->queue.next, struct rsxx_dma, list);
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list_del(&dma->list);
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ctrl->stats.sw_q_depth--;
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spin_unlock_bh(&ctrl->queue_lock);
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/*
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* This will catch any DMAs that slipped in right before the
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* fault, but was queued after all the other DMAs were
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* cancelled.
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*/
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if (unlikely(ctrl->card->dma_fault)) {
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push_tracker(ctrl->trackers, tag);
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rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
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continue;
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}
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if (dma->cmd != HW_CMD_BLK_DISCARD) {
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if (dma->cmd == HW_CMD_BLK_WRITE)
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dir = PCI_DMA_TODEVICE;
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else
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dir = PCI_DMA_FROMDEVICE;
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/*
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* The function pci_map_page is placed here because we
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* can only, by design, issue up to 255 commands to the
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* hardware at one time per DMA channel. So the maximum
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* amount of mapped memory would be 255 * 4 channels *
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* 4096 Bytes which is less than 2GB, the limit of a x8
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* Non-HWWD PCIe slot. This way the pci_map_page
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* function should never fail because of a lack of
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* mappable memory.
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*/
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dma->dma_addr = pci_map_page(ctrl->card->dev, dma->page,
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dma->pg_off, dma->sub_page.cnt << 9, dir);
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if (pci_dma_mapping_error(ctrl->card->dev, dma->dma_addr)) {
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push_tracker(ctrl->trackers, tag);
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rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
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continue;
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}
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}
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set_tracker_dma(ctrl->trackers, tag, dma);
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hw_cmd_buf[ctrl->cmd.idx].command = dma->cmd;
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hw_cmd_buf[ctrl->cmd.idx].tag = tag;
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hw_cmd_buf[ctrl->cmd.idx]._rsvd = 0;
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hw_cmd_buf[ctrl->cmd.idx].sub_page =
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((dma->sub_page.cnt & 0x7) << 4) |
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(dma->sub_page.off & 0x7);
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hw_cmd_buf[ctrl->cmd.idx].device_addr =
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cpu_to_le32(dma->laddr);
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hw_cmd_buf[ctrl->cmd.idx].host_addr =
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cpu_to_le64(dma->dma_addr);
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dev_dbg(CARD_TO_DEV(ctrl->card),
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"Issue DMA%d(laddr %d tag %d) to idx %d\n",
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ctrl->id, dma->laddr, tag, ctrl->cmd.idx);
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ctrl->cmd.idx = (ctrl->cmd.idx + 1) & RSXX_CS_IDX_MASK;
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cmds_pending++;
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if (dma->cmd == HW_CMD_BLK_WRITE)
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ctrl->stats.writes_issued++;
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else if (dma->cmd == HW_CMD_BLK_DISCARD)
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ctrl->stats.discards_issued++;
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else
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ctrl->stats.reads_issued++;
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}
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/* Let HW know we've queued commands. */
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if (cmds_pending) {
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atomic_add(cmds_pending, &ctrl->stats.hw_q_depth);
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mod_timer(&ctrl->activity_timer,
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jiffies + DMA_ACTIVITY_TIMEOUT);
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if (unlikely(ctrl->card->eeh_state)) {
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del_timer_sync(&ctrl->activity_timer);
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return;
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}
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iowrite32(ctrl->cmd.idx, ctrl->regmap + SW_CMD_IDX);
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}
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}
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static void rsxx_dma_done(struct rsxx_dma_ctrl *ctrl)
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{
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struct rsxx_dma *dma;
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unsigned long flags;
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u16 count;
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u8 status;
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u8 tag;
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struct hw_status *hw_st_buf;
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|
|
hw_st_buf = ctrl->status.buf;
|
|
|
|
if (unlikely(ctrl->card->halt) ||
|
|
unlikely(ctrl->card->dma_fault) ||
|
|
unlikely(ctrl->card->eeh_state))
|
|
return;
|
|
|
|
count = le16_to_cpu(hw_st_buf[ctrl->status.idx].count);
|
|
|
|
while (count == ctrl->e_cnt) {
|
|
/*
|
|
* The read memory-barrier is necessary to keep aggressive
|
|
* processors/optimizers (such as the PPC Apple G5) from
|
|
* reordering the following status-buffer tag & status read
|
|
* *before* the count read on subsequent iterations of the
|
|
* loop!
|
|
*/
|
|
rmb();
|
|
|
|
status = hw_st_buf[ctrl->status.idx].status;
|
|
tag = hw_st_buf[ctrl->status.idx].tag;
|
|
|
|
dma = get_tracker_dma(ctrl->trackers, tag);
|
|
if (dma == NULL) {
|
|
spin_lock_irqsave(&ctrl->card->irq_lock, flags);
|
|
rsxx_disable_ier(ctrl->card, CR_INTR_DMA_ALL);
|
|
spin_unlock_irqrestore(&ctrl->card->irq_lock, flags);
|
|
|
|
dev_err(CARD_TO_DEV(ctrl->card),
|
|
"No tracker for tag %d "
|
|
"(idx %d id %d)\n",
|
|
tag, ctrl->status.idx, ctrl->id);
|
|
return;
|
|
}
|
|
|
|
dev_dbg(CARD_TO_DEV(ctrl->card),
|
|
"Completing DMA%d"
|
|
"(laddr x%x tag %d st: x%x cnt: x%04x) from idx %d.\n",
|
|
ctrl->id, dma->laddr, tag, status, count,
|
|
ctrl->status.idx);
|
|
|
|
atomic_dec(&ctrl->stats.hw_q_depth);
|
|
|
|
mod_timer(&ctrl->activity_timer,
|
|
jiffies + DMA_ACTIVITY_TIMEOUT);
|
|
|
|
if (status)
|
|
rsxx_handle_dma_error(ctrl, dma, status);
|
|
else
|
|
rsxx_complete_dma(ctrl, dma, 0);
|
|
|
|
push_tracker(ctrl->trackers, tag);
|
|
|
|
ctrl->status.idx = (ctrl->status.idx + 1) &
|
|
RSXX_CS_IDX_MASK;
|
|
ctrl->e_cnt++;
|
|
|
|
count = le16_to_cpu(hw_st_buf[ctrl->status.idx].count);
|
|
}
|
|
|
|
dma_intr_coal_auto_tune(ctrl->card);
|
|
|
|
if (atomic_read(&ctrl->stats.hw_q_depth) == 0)
|
|
del_timer_sync(&ctrl->activity_timer);
|
|
|
|
spin_lock_irqsave(&ctrl->card->irq_lock, flags);
|
|
rsxx_enable_ier(ctrl->card, CR_INTR_DMA(ctrl->id));
|
|
spin_unlock_irqrestore(&ctrl->card->irq_lock, flags);
|
|
|
|
spin_lock_bh(&ctrl->queue_lock);
|
|
if (ctrl->stats.sw_q_depth)
|
|
queue_work(ctrl->issue_wq, &ctrl->issue_dma_work);
|
|
spin_unlock_bh(&ctrl->queue_lock);
|
|
}
|
|
|
|
static void rsxx_schedule_issue(struct work_struct *work)
|
|
{
|
|
struct rsxx_dma_ctrl *ctrl;
|
|
|
|
ctrl = container_of(work, struct rsxx_dma_ctrl, issue_dma_work);
|
|
|
|
mutex_lock(&ctrl->work_lock);
|
|
rsxx_issue_dmas(ctrl);
|
|
mutex_unlock(&ctrl->work_lock);
|
|
}
|
|
|
|
static void rsxx_schedule_done(struct work_struct *work)
|
|
{
|
|
struct rsxx_dma_ctrl *ctrl;
|
|
|
|
ctrl = container_of(work, struct rsxx_dma_ctrl, dma_done_work);
|
|
|
|
mutex_lock(&ctrl->work_lock);
|
|
rsxx_dma_done(ctrl);
|
|
mutex_unlock(&ctrl->work_lock);
|
|
}
|
|
|
|
static blk_status_t rsxx_queue_discard(struct rsxx_cardinfo *card,
|
|
struct list_head *q,
|
|
unsigned int laddr,
|
|
rsxx_dma_cb cb,
|
|
void *cb_data)
|
|
{
|
|
struct rsxx_dma *dma;
|
|
|
|
dma = kmem_cache_alloc(rsxx_dma_pool, GFP_KERNEL);
|
|
if (!dma)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
dma->cmd = HW_CMD_BLK_DISCARD;
|
|
dma->laddr = laddr;
|
|
dma->dma_addr = 0;
|
|
dma->sub_page.off = 0;
|
|
dma->sub_page.cnt = 0;
|
|
dma->page = NULL;
|
|
dma->pg_off = 0;
|
|
dma->cb = cb;
|
|
dma->cb_data = cb_data;
|
|
|
|
dev_dbg(CARD_TO_DEV(card), "Queuing[D] laddr %x\n", dma->laddr);
|
|
|
|
list_add_tail(&dma->list, q);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static blk_status_t rsxx_queue_dma(struct rsxx_cardinfo *card,
|
|
struct list_head *q,
|
|
int dir,
|
|
unsigned int dma_off,
|
|
unsigned int dma_len,
|
|
unsigned int laddr,
|
|
struct page *page,
|
|
unsigned int pg_off,
|
|
rsxx_dma_cb cb,
|
|
void *cb_data)
|
|
{
|
|
struct rsxx_dma *dma;
|
|
|
|
dma = kmem_cache_alloc(rsxx_dma_pool, GFP_KERNEL);
|
|
if (!dma)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
dma->cmd = dir ? HW_CMD_BLK_WRITE : HW_CMD_BLK_READ;
|
|
dma->laddr = laddr;
|
|
dma->sub_page.off = (dma_off >> 9);
|
|
dma->sub_page.cnt = (dma_len >> 9);
|
|
dma->page = page;
|
|
dma->pg_off = pg_off;
|
|
dma->cb = cb;
|
|
dma->cb_data = cb_data;
|
|
|
|
dev_dbg(CARD_TO_DEV(card),
|
|
"Queuing[%c] laddr %x off %d cnt %d page %p pg_off %d\n",
|
|
dir ? 'W' : 'R', dma->laddr, dma->sub_page.off,
|
|
dma->sub_page.cnt, dma->page, dma->pg_off);
|
|
|
|
/* Queue the DMA */
|
|
list_add_tail(&dma->list, q);
|
|
|
|
return 0;
|
|
}
|
|
|
|
blk_status_t rsxx_dma_queue_bio(struct rsxx_cardinfo *card,
|
|
struct bio *bio,
|
|
atomic_t *n_dmas,
|
|
rsxx_dma_cb cb,
|
|
void *cb_data)
|
|
{
|
|
struct list_head dma_list[RSXX_MAX_TARGETS];
|
|
struct bio_vec bvec;
|
|
struct bvec_iter iter;
|
|
unsigned long long addr8;
|
|
unsigned int laddr;
|
|
unsigned int bv_len;
|
|
unsigned int bv_off;
|
|
unsigned int dma_off;
|
|
unsigned int dma_len;
|
|
int dma_cnt[RSXX_MAX_TARGETS];
|
|
int tgt;
|
|
blk_status_t st;
|
|
int i;
|
|
|
|
addr8 = bio->bi_iter.bi_sector << 9; /* sectors are 512 bytes */
|
|
atomic_set(n_dmas, 0);
|
|
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
INIT_LIST_HEAD(&dma_list[i]);
|
|
dma_cnt[i] = 0;
|
|
}
|
|
|
|
if (bio_op(bio) == REQ_OP_DISCARD) {
|
|
bv_len = bio->bi_iter.bi_size;
|
|
|
|
while (bv_len > 0) {
|
|
tgt = rsxx_get_dma_tgt(card, addr8);
|
|
laddr = rsxx_addr8_to_laddr(addr8, card);
|
|
|
|
st = rsxx_queue_discard(card, &dma_list[tgt], laddr,
|
|
cb, cb_data);
|
|
if (st)
|
|
goto bvec_err;
|
|
|
|
dma_cnt[tgt]++;
|
|
atomic_inc(n_dmas);
|
|
addr8 += RSXX_HW_BLK_SIZE;
|
|
bv_len -= RSXX_HW_BLK_SIZE;
|
|
}
|
|
} else {
|
|
bio_for_each_segment(bvec, bio, iter) {
|
|
bv_len = bvec.bv_len;
|
|
bv_off = bvec.bv_offset;
|
|
|
|
while (bv_len > 0) {
|
|
tgt = rsxx_get_dma_tgt(card, addr8);
|
|
laddr = rsxx_addr8_to_laddr(addr8, card);
|
|
dma_off = addr8 & RSXX_HW_BLK_MASK;
|
|
dma_len = min(bv_len,
|
|
RSXX_HW_BLK_SIZE - dma_off);
|
|
|
|
st = rsxx_queue_dma(card, &dma_list[tgt],
|
|
bio_data_dir(bio),
|
|
dma_off, dma_len,
|
|
laddr, bvec.bv_page,
|
|
bv_off, cb, cb_data);
|
|
if (st)
|
|
goto bvec_err;
|
|
|
|
dma_cnt[tgt]++;
|
|
atomic_inc(n_dmas);
|
|
addr8 += dma_len;
|
|
bv_off += dma_len;
|
|
bv_len -= dma_len;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
if (!list_empty(&dma_list[i])) {
|
|
spin_lock_bh(&card->ctrl[i].queue_lock);
|
|
card->ctrl[i].stats.sw_q_depth += dma_cnt[i];
|
|
list_splice_tail(&dma_list[i], &card->ctrl[i].queue);
|
|
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
|
|
|
queue_work(card->ctrl[i].issue_wq,
|
|
&card->ctrl[i].issue_dma_work);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
bvec_err:
|
|
for (i = 0; i < card->n_targets; i++)
|
|
rsxx_cleanup_dma_queue(&card->ctrl[i], &dma_list[i],
|
|
FREE_DMA);
|
|
return st;
|
|
}
|
|
|
|
|
|
/*----------------- DMA Engine Initialization & Setup -------------------*/
|
|
int rsxx_hw_buffers_init(struct pci_dev *dev, struct rsxx_dma_ctrl *ctrl)
|
|
{
|
|
ctrl->status.buf = pci_alloc_consistent(dev, STATUS_BUFFER_SIZE8,
|
|
&ctrl->status.dma_addr);
|
|
ctrl->cmd.buf = pci_alloc_consistent(dev, COMMAND_BUFFER_SIZE8,
|
|
&ctrl->cmd.dma_addr);
|
|
if (ctrl->status.buf == NULL || ctrl->cmd.buf == NULL)
|
|
return -ENOMEM;
|
|
|
|
memset(ctrl->status.buf, 0xac, STATUS_BUFFER_SIZE8);
|
|
iowrite32(lower_32_bits(ctrl->status.dma_addr),
|
|
ctrl->regmap + SB_ADD_LO);
|
|
iowrite32(upper_32_bits(ctrl->status.dma_addr),
|
|
ctrl->regmap + SB_ADD_HI);
|
|
|
|
memset(ctrl->cmd.buf, 0x83, COMMAND_BUFFER_SIZE8);
|
|
iowrite32(lower_32_bits(ctrl->cmd.dma_addr), ctrl->regmap + CB_ADD_LO);
|
|
iowrite32(upper_32_bits(ctrl->cmd.dma_addr), ctrl->regmap + CB_ADD_HI);
|
|
|
|
ctrl->status.idx = ioread32(ctrl->regmap + HW_STATUS_CNT);
|
|
if (ctrl->status.idx > RSXX_MAX_OUTSTANDING_CMDS) {
|
|
dev_crit(&dev->dev, "Failed reading status cnt x%x\n",
|
|
ctrl->status.idx);
|
|
return -EINVAL;
|
|
}
|
|
iowrite32(ctrl->status.idx, ctrl->regmap + HW_STATUS_CNT);
|
|
iowrite32(ctrl->status.idx, ctrl->regmap + SW_STATUS_CNT);
|
|
|
|
ctrl->cmd.idx = ioread32(ctrl->regmap + HW_CMD_IDX);
|
|
if (ctrl->cmd.idx > RSXX_MAX_OUTSTANDING_CMDS) {
|
|
dev_crit(&dev->dev, "Failed reading cmd cnt x%x\n",
|
|
ctrl->status.idx);
|
|
return -EINVAL;
|
|
}
|
|
iowrite32(ctrl->cmd.idx, ctrl->regmap + HW_CMD_IDX);
|
|
iowrite32(ctrl->cmd.idx, ctrl->regmap + SW_CMD_IDX);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rsxx_dma_ctrl_init(struct pci_dev *dev,
|
|
struct rsxx_dma_ctrl *ctrl)
|
|
{
|
|
int i;
|
|
int st;
|
|
|
|
memset(&ctrl->stats, 0, sizeof(ctrl->stats));
|
|
|
|
ctrl->trackers = vmalloc(DMA_TRACKER_LIST_SIZE8);
|
|
if (!ctrl->trackers)
|
|
return -ENOMEM;
|
|
|
|
ctrl->trackers->head = 0;
|
|
for (i = 0; i < RSXX_MAX_OUTSTANDING_CMDS; i++) {
|
|
ctrl->trackers->list[i].next_tag = i + 1;
|
|
ctrl->trackers->list[i].dma = NULL;
|
|
}
|
|
ctrl->trackers->list[RSXX_MAX_OUTSTANDING_CMDS-1].next_tag = -1;
|
|
spin_lock_init(&ctrl->trackers->lock);
|
|
|
|
spin_lock_init(&ctrl->queue_lock);
|
|
mutex_init(&ctrl->work_lock);
|
|
INIT_LIST_HEAD(&ctrl->queue);
|
|
|
|
timer_setup(&ctrl->activity_timer, dma_engine_stalled, 0);
|
|
|
|
ctrl->issue_wq = alloc_ordered_workqueue(DRIVER_NAME"_issue", 0);
|
|
if (!ctrl->issue_wq)
|
|
return -ENOMEM;
|
|
|
|
ctrl->done_wq = alloc_ordered_workqueue(DRIVER_NAME"_done", 0);
|
|
if (!ctrl->done_wq)
|
|
return -ENOMEM;
|
|
|
|
INIT_WORK(&ctrl->issue_dma_work, rsxx_schedule_issue);
|
|
INIT_WORK(&ctrl->dma_done_work, rsxx_schedule_done);
|
|
|
|
st = rsxx_hw_buffers_init(dev, ctrl);
|
|
if (st)
|
|
return st;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rsxx_dma_stripe_setup(struct rsxx_cardinfo *card,
|
|
unsigned int stripe_size8)
|
|
{
|
|
if (!is_power_of_2(stripe_size8)) {
|
|
dev_err(CARD_TO_DEV(card),
|
|
"stripe_size is NOT a power of 2!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
card->_stripe.lower_mask = stripe_size8 - 1;
|
|
|
|
card->_stripe.upper_mask = ~(card->_stripe.lower_mask);
|
|
card->_stripe.upper_shift = ffs(card->n_targets) - 1;
|
|
|
|
card->_stripe.target_mask = card->n_targets - 1;
|
|
card->_stripe.target_shift = ffs(stripe_size8) - 1;
|
|
|
|
dev_dbg(CARD_TO_DEV(card), "_stripe.lower_mask = x%016llx\n",
|
|
card->_stripe.lower_mask);
|
|
dev_dbg(CARD_TO_DEV(card), "_stripe.upper_shift = x%016llx\n",
|
|
card->_stripe.upper_shift);
|
|
dev_dbg(CARD_TO_DEV(card), "_stripe.upper_mask = x%016llx\n",
|
|
card->_stripe.upper_mask);
|
|
dev_dbg(CARD_TO_DEV(card), "_stripe.target_mask = x%016llx\n",
|
|
card->_stripe.target_mask);
|
|
dev_dbg(CARD_TO_DEV(card), "_stripe.target_shift = x%016llx\n",
|
|
card->_stripe.target_shift);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rsxx_dma_configure(struct rsxx_cardinfo *card)
|
|
{
|
|
u32 intr_coal;
|
|
|
|
intr_coal = dma_intr_coal_val(card->config.data.intr_coal.mode,
|
|
card->config.data.intr_coal.count,
|
|
card->config.data.intr_coal.latency);
|
|
iowrite32(intr_coal, card->regmap + INTR_COAL);
|
|
|
|
return rsxx_dma_stripe_setup(card, card->config.data.stripe_size);
|
|
}
|
|
|
|
int rsxx_dma_setup(struct rsxx_cardinfo *card)
|
|
{
|
|
unsigned long flags;
|
|
int st;
|
|
int i;
|
|
|
|
dev_info(CARD_TO_DEV(card),
|
|
"Initializing %d DMA targets\n",
|
|
card->n_targets);
|
|
|
|
/* Regmap is divided up into 4K chunks. One for each DMA channel */
|
|
for (i = 0; i < card->n_targets; i++)
|
|
card->ctrl[i].regmap = card->regmap + (i * 4096);
|
|
|
|
card->dma_fault = 0;
|
|
|
|
/* Reset the DMA queues */
|
|
rsxx_dma_queue_reset(card);
|
|
|
|
/************* Setup DMA Control *************/
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
st = rsxx_dma_ctrl_init(card->dev, &card->ctrl[i]);
|
|
if (st)
|
|
goto failed_dma_setup;
|
|
|
|
card->ctrl[i].card = card;
|
|
card->ctrl[i].id = i;
|
|
}
|
|
|
|
card->scrub_hard = 1;
|
|
|
|
if (card->config_valid)
|
|
rsxx_dma_configure(card);
|
|
|
|
/* Enable the interrupts after all setup has completed. */
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
spin_lock_irqsave(&card->irq_lock, flags);
|
|
rsxx_enable_ier_and_isr(card, CR_INTR_DMA(i));
|
|
spin_unlock_irqrestore(&card->irq_lock, flags);
|
|
}
|
|
|
|
return 0;
|
|
|
|
failed_dma_setup:
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
struct rsxx_dma_ctrl *ctrl = &card->ctrl[i];
|
|
|
|
if (ctrl->issue_wq) {
|
|
destroy_workqueue(ctrl->issue_wq);
|
|
ctrl->issue_wq = NULL;
|
|
}
|
|
|
|
if (ctrl->done_wq) {
|
|
destroy_workqueue(ctrl->done_wq);
|
|
ctrl->done_wq = NULL;
|
|
}
|
|
|
|
if (ctrl->trackers)
|
|
vfree(ctrl->trackers);
|
|
|
|
if (ctrl->status.buf)
|
|
pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
|
|
ctrl->status.buf,
|
|
ctrl->status.dma_addr);
|
|
if (ctrl->cmd.buf)
|
|
pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
|
|
ctrl->cmd.buf, ctrl->cmd.dma_addr);
|
|
}
|
|
|
|
return st;
|
|
}
|
|
|
|
int rsxx_dma_cancel(struct rsxx_dma_ctrl *ctrl)
|
|
{
|
|
struct rsxx_dma *dma;
|
|
int i;
|
|
int cnt = 0;
|
|
|
|
/* Clean up issued DMAs */
|
|
for (i = 0; i < RSXX_MAX_OUTSTANDING_CMDS; i++) {
|
|
dma = get_tracker_dma(ctrl->trackers, i);
|
|
if (dma) {
|
|
atomic_dec(&ctrl->stats.hw_q_depth);
|
|
rsxx_complete_dma(ctrl, dma, DMA_CANCELLED);
|
|
push_tracker(ctrl->trackers, i);
|
|
cnt++;
|
|
}
|
|
}
|
|
|
|
return cnt;
|
|
}
|
|
|
|
void rsxx_dma_destroy(struct rsxx_cardinfo *card)
|
|
{
|
|
struct rsxx_dma_ctrl *ctrl;
|
|
int i;
|
|
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
ctrl = &card->ctrl[i];
|
|
|
|
if (ctrl->issue_wq) {
|
|
destroy_workqueue(ctrl->issue_wq);
|
|
ctrl->issue_wq = NULL;
|
|
}
|
|
|
|
if (ctrl->done_wq) {
|
|
destroy_workqueue(ctrl->done_wq);
|
|
ctrl->done_wq = NULL;
|
|
}
|
|
|
|
if (timer_pending(&ctrl->activity_timer))
|
|
del_timer_sync(&ctrl->activity_timer);
|
|
|
|
/* Clean up the DMA queue */
|
|
spin_lock_bh(&ctrl->queue_lock);
|
|
rsxx_cleanup_dma_queue(ctrl, &ctrl->queue, COMPLETE_DMA);
|
|
spin_unlock_bh(&ctrl->queue_lock);
|
|
|
|
rsxx_dma_cancel(ctrl);
|
|
|
|
vfree(ctrl->trackers);
|
|
|
|
pci_free_consistent(card->dev, STATUS_BUFFER_SIZE8,
|
|
ctrl->status.buf, ctrl->status.dma_addr);
|
|
pci_free_consistent(card->dev, COMMAND_BUFFER_SIZE8,
|
|
ctrl->cmd.buf, ctrl->cmd.dma_addr);
|
|
}
|
|
}
|
|
|
|
int rsxx_eeh_save_issued_dmas(struct rsxx_cardinfo *card)
|
|
{
|
|
int i;
|
|
int j;
|
|
int cnt;
|
|
struct rsxx_dma *dma;
|
|
struct list_head *issued_dmas;
|
|
|
|
issued_dmas = kcalloc(card->n_targets, sizeof(*issued_dmas),
|
|
GFP_KERNEL);
|
|
if (!issued_dmas)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < card->n_targets; i++) {
|
|
INIT_LIST_HEAD(&issued_dmas[i]);
|
|
cnt = 0;
|
|
for (j = 0; j < RSXX_MAX_OUTSTANDING_CMDS; j++) {
|
|
dma = get_tracker_dma(card->ctrl[i].trackers, j);
|
|
if (dma == NULL)
|
|
continue;
|
|
|
|
if (dma->cmd == HW_CMD_BLK_WRITE)
|
|
card->ctrl[i].stats.writes_issued--;
|
|
else if (dma->cmd == HW_CMD_BLK_DISCARD)
|
|
card->ctrl[i].stats.discards_issued--;
|
|
else
|
|
card->ctrl[i].stats.reads_issued--;
|
|
|
|
if (dma->cmd != HW_CMD_BLK_DISCARD) {
|
|
pci_unmap_page(card->dev, dma->dma_addr,
|
|
get_dma_size(dma),
|
|
dma->cmd == HW_CMD_BLK_WRITE ?
|
|
PCI_DMA_TODEVICE :
|
|
PCI_DMA_FROMDEVICE);
|
|
}
|
|
|
|
list_add_tail(&dma->list, &issued_dmas[i]);
|
|
push_tracker(card->ctrl[i].trackers, j);
|
|
cnt++;
|
|
}
|
|
|
|
spin_lock_bh(&card->ctrl[i].queue_lock);
|
|
list_splice(&issued_dmas[i], &card->ctrl[i].queue);
|
|
|
|
atomic_sub(cnt, &card->ctrl[i].stats.hw_q_depth);
|
|
card->ctrl[i].stats.sw_q_depth += cnt;
|
|
card->ctrl[i].e_cnt = 0;
|
|
spin_unlock_bh(&card->ctrl[i].queue_lock);
|
|
}
|
|
|
|
kfree(issued_dmas);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int rsxx_dma_init(void)
|
|
{
|
|
rsxx_dma_pool = KMEM_CACHE(rsxx_dma, SLAB_HWCACHE_ALIGN);
|
|
if (!rsxx_dma_pool)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void rsxx_dma_cleanup(void)
|
|
{
|
|
kmem_cache_destroy(rsxx_dma_pool);
|
|
}
|
|
|