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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/mmc/card.h>#include <linux/mmc/host.h>
#include "queue.h"#include "block.h"#include "core.h"#include "card.h"#include "crypto.h"#include "host.h"
#define MMC_DMA_MAP_MERGE_SEGMENTS 512
static inline bool mmc_cqe_dcmd_busy(struct mmc_queue *mq){ /* Allow only 1 DCMD at a time */ return mq->in_flight[MMC_ISSUE_DCMD];}
void mmc_cqe_check_busy(struct mmc_queue *mq){ if ((mq->cqe_busy & MMC_CQE_DCMD_BUSY) && !mmc_cqe_dcmd_busy(mq)) mq->cqe_busy &= ~MMC_CQE_DCMD_BUSY;}
static inline bool mmc_cqe_can_dcmd(struct mmc_host *host){ return host->caps2 & MMC_CAP2_CQE_DCMD;}
static enum mmc_issue_type mmc_cqe_issue_type(struct mmc_host *host, struct request *req){ switch (req_op(req)) { case REQ_OP_DRV_IN: case REQ_OP_DRV_OUT: case REQ_OP_DISCARD: case REQ_OP_SECURE_ERASE: case REQ_OP_WRITE_ZEROES: return MMC_ISSUE_SYNC; case REQ_OP_FLUSH: return mmc_cqe_can_dcmd(host) ? MMC_ISSUE_DCMD : MMC_ISSUE_SYNC; default: return MMC_ISSUE_ASYNC; }}
enum mmc_issue_type mmc_issue_type(struct mmc_queue *mq, struct request *req){ struct mmc_host *host = mq->card->host;
if (host->cqe_enabled && !host->hsq_enabled) return mmc_cqe_issue_type(host, req);
if (req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_WRITE) return MMC_ISSUE_ASYNC;
return MMC_ISSUE_SYNC;}
static void __mmc_cqe_recovery_notifier(struct mmc_queue *mq){ if (!mq->recovery_needed) { mq->recovery_needed = true; schedule_work(&mq->recovery_work); }}
void mmc_cqe_recovery_notifier(struct mmc_request *mrq){ struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req, brq.mrq); struct request *req = mmc_queue_req_to_req(mqrq); struct request_queue *q = req->q; struct mmc_queue *mq = q->queuedata; unsigned long flags;
spin_lock_irqsave(&mq->lock, flags); __mmc_cqe_recovery_notifier(mq); spin_unlock_irqrestore(&mq->lock, flags);}
static enum blk_eh_timer_return mmc_cqe_timed_out(struct request *req){ struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req); struct mmc_request *mrq = &mqrq->brq.mrq; struct mmc_queue *mq = req->q->queuedata; struct mmc_host *host = mq->card->host; enum mmc_issue_type issue_type = mmc_issue_type(mq, req); bool recovery_needed = false;
switch (issue_type) { case MMC_ISSUE_ASYNC: case MMC_ISSUE_DCMD: if (host->cqe_ops->cqe_timeout(host, mrq, &recovery_needed)) { if (recovery_needed) mmc_cqe_recovery_notifier(mrq); return BLK_EH_RESET_TIMER; } /* The request has gone already */ return BLK_EH_DONE; default: /* Timeout is handled by mmc core */ return BLK_EH_RESET_TIMER; }}
static enum blk_eh_timer_return mmc_mq_timed_out(struct request *req){ struct request_queue *q = req->q; struct mmc_queue *mq = q->queuedata; struct mmc_card *card = mq->card; struct mmc_host *host = card->host; unsigned long flags; bool ignore_tout;
spin_lock_irqsave(&mq->lock, flags); ignore_tout = mq->recovery_needed || !host->cqe_enabled || host->hsq_enabled; spin_unlock_irqrestore(&mq->lock, flags);
return ignore_tout ? BLK_EH_RESET_TIMER : mmc_cqe_timed_out(req);}
static void mmc_mq_recovery_handler(struct work_struct *work){ struct mmc_queue *mq = container_of(work, struct mmc_queue, recovery_work); struct request_queue *q = mq->queue; struct mmc_host *host = mq->card->host;
mmc_get_card(mq->card, &mq->ctx);
mq->in_recovery = true;
if (host->cqe_enabled && !host->hsq_enabled) mmc_blk_cqe_recovery(mq); else mmc_blk_mq_recovery(mq);
mq->in_recovery = false;
spin_lock_irq(&mq->lock); mq->recovery_needed = false; spin_unlock_irq(&mq->lock);
if (host->hsq_enabled) host->cqe_ops->cqe_recovery_finish(host);
mmc_put_card(mq->card, &mq->ctx);
blk_mq_run_hw_queues(q, true);}
static struct scatterlist *mmc_alloc_sg(unsigned short sg_len, gfp_t gfp){ struct scatterlist *sg;
sg = kmalloc_objs(*sg, sg_len, gfp); if (sg) sg_init_table(sg, sg_len);
return sg;}
static void mmc_queue_setup_discard(struct mmc_card *card, struct queue_limits *lim){ unsigned max_discard;
max_discard = mmc_calc_max_discard(card); if (!max_discard) return;
lim->max_hw_discard_sectors = max_discard; if (mmc_card_can_secure_erase_trim(card)) { if (mmc_card_fixed_secure_erase_trim_time(card)) lim->max_secure_erase_sectors = UINT_MAX >> card->erase_shift; else lim->max_secure_erase_sectors = max_discard; }
if (mmc_card_can_trim(card) && card->erased_byte == 0) lim->max_write_zeroes_sectors = max_discard;
/* granularity must not be greater than max. discard */ if (card->pref_erase > max_discard) lim->discard_granularity = SECTOR_SIZE; else lim->discard_granularity = card->pref_erase << 9;}
static unsigned short mmc_get_max_segments(struct mmc_host *host){ return host->can_dma_map_merge ? MMC_DMA_MAP_MERGE_SEGMENTS : host->max_segs;}
static int mmc_mq_init_request(struct blk_mq_tag_set *set, struct request *req, unsigned int hctx_idx, int numa_node){ struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req); struct mmc_queue *mq = set->driver_data; struct mmc_card *card = mq->card; struct mmc_host *host = card->host; u16 sg_len = mmc_get_max_segments(host);
if (!sg_len) { dev_err(mmc_dev(host), "Wrong max_segs assigned\n"); return -EINVAL; }
mq_rq->sg = mmc_alloc_sg(sg_len, GFP_KERNEL); if (!mq_rq->sg) return -ENOMEM;
return 0;}
static void mmc_mq_exit_request(struct blk_mq_tag_set *set, struct request *req, unsigned int hctx_idx){ struct mmc_queue_req *mq_rq = req_to_mmc_queue_req(req);
kfree(mq_rq->sg); mq_rq->sg = NULL;}
static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd){ struct request *req = bd->rq; struct request_queue *q = req->q; struct mmc_queue *mq = q->queuedata; struct mmc_card *card = mq->card; struct mmc_host *host = card->host; enum mmc_issue_type issue_type; enum mmc_issued issued; bool get_card, cqe_retune_ok; blk_status_t ret;
if (mmc_card_removed(mq->card)) { req->rq_flags |= RQF_QUIET; return BLK_STS_IOERR; }
issue_type = mmc_issue_type(mq, req);
spin_lock_irq(&mq->lock);
if (mq->recovery_needed || mq->busy) { spin_unlock_irq(&mq->lock); return BLK_STS_RESOURCE; }
switch (issue_type) { case MMC_ISSUE_DCMD: if (mmc_cqe_dcmd_busy(mq)) { mq->cqe_busy |= MMC_CQE_DCMD_BUSY; spin_unlock_irq(&mq->lock); return BLK_STS_RESOURCE; } break; case MMC_ISSUE_ASYNC: if (host->hsq_enabled && mq->in_flight[issue_type] > host->hsq_depth) { spin_unlock_irq(&mq->lock); return BLK_STS_RESOURCE; } break; default: /* * Timeouts are handled by mmc core, and we don't have a host * API to abort requests, so we can't handle the timeout anyway. * However, when the timeout happens, blk_mq_complete_request() * no longer works (to stop the request disappearing under us). * To avoid racing with that, set a large timeout. */ req->timeout = 600 * HZ; break; }
/* Parallel dispatch of requests is not supported at the moment */ mq->busy = true;
mq->in_flight[issue_type] += 1; get_card = (mmc_tot_in_flight(mq) == 1); cqe_retune_ok = (mmc_cqe_qcnt(mq) == 1);
spin_unlock_irq(&mq->lock);
if (!(req->rq_flags & RQF_DONTPREP)) { req_to_mmc_queue_req(req)->retries = 0; req->rq_flags |= RQF_DONTPREP; }
if (get_card) mmc_get_card(card, &mq->ctx);
if (host->cqe_enabled) { host->retune_now = host->need_retune && cqe_retune_ok && !host->hold_retune; }
blk_mq_start_request(req);
issued = mmc_blk_mq_issue_rq(mq, req);
switch (issued) { case MMC_REQ_BUSY: ret = BLK_STS_RESOURCE; break; case MMC_REQ_FAILED_TO_START: ret = BLK_STS_IOERR; break; default: ret = BLK_STS_OK; break; }
if (issued != MMC_REQ_STARTED) { bool put_card = false;
spin_lock_irq(&mq->lock); mq->in_flight[issue_type] -= 1; if (mmc_tot_in_flight(mq) == 0) put_card = true; mq->busy = false; spin_unlock_irq(&mq->lock); if (put_card) mmc_put_card(card, &mq->ctx); } else { WRITE_ONCE(mq->busy, false); }
return ret;}
static const struct blk_mq_ops mmc_mq_ops = { .queue_rq = mmc_mq_queue_rq, .init_request = mmc_mq_init_request, .exit_request = mmc_mq_exit_request, .complete = mmc_blk_mq_complete, .timeout = mmc_mq_timed_out,};
static struct gendisk *mmc_alloc_disk(struct mmc_queue *mq, struct mmc_card *card, unsigned int features){ struct mmc_host *host = card->host; struct queue_limits lim = { .features = features, }; struct gendisk *disk;
if (mmc_card_can_erase(card)) mmc_queue_setup_discard(card, &lim);
lim.max_hw_sectors = min(host->max_blk_count, host->max_req_size / 512);
if (mmc_card_mmc(card) && card->ext_csd.data_sector_size) lim.logical_block_size = card->ext_csd.data_sector_size; else lim.logical_block_size = 512;
WARN_ON_ONCE(lim.logical_block_size != 512 && lim.logical_block_size != 4096);
/* * Setting a virt_boundary implicity sets a max_segment_size, so try * to set the hardware one here. */ if (host->can_dma_map_merge) { lim.virt_boundary_mask = dma_get_merge_boundary(mmc_dev(host)); lim.max_segments = MMC_DMA_MAP_MERGE_SEGMENTS; } else { lim.max_segment_size = round_down(host->max_seg_size, lim.logical_block_size); lim.max_segments = host->max_segs; }
if (mmc_host_is_spi(host) && host->use_spi_crc) lim.features |= BLK_FEAT_STABLE_WRITES;
disk = blk_mq_alloc_disk(&mq->tag_set, &lim, mq); if (IS_ERR(disk)) return disk; mq->queue = disk->queue;
blk_queue_rq_timeout(mq->queue, 60 * HZ);
if (mmc_dev(host)->dma_parms) dma_set_max_seg_size(mmc_dev(host), queue_max_segment_size(mq->queue));
INIT_WORK(&mq->recovery_work, mmc_mq_recovery_handler); INIT_WORK(&mq->complete_work, mmc_blk_mq_complete_work);
mutex_init(&mq->complete_lock);
init_waitqueue_head(&mq->wait);
mmc_crypto_setup_queue(mq->queue, host); return disk;}
static inline bool mmc_merge_capable(struct mmc_host *host){ return host->caps2 & MMC_CAP2_MERGE_CAPABLE;}
/* Set queue depth to get a reasonable value for q->nr_requests */#define MMC_QUEUE_DEPTH 64
/** * mmc_init_queue - initialise a queue structure. * @mq: mmc queue * @card: mmc card to attach this queue * @features: block layer features (BLK_FEAT_*) * * Initialise a MMC card request queue. */struct gendisk *mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card, unsigned int features){ struct mmc_host *host = card->host; struct gendisk *disk; int ret;
mq->card = card; spin_lock_init(&mq->lock);
memset(&mq->tag_set, 0, sizeof(mq->tag_set)); mq->tag_set.ops = &mmc_mq_ops; /* * The queue depth for CQE must match the hardware because the request * tag is used to index the hardware queue. */ if (host->cqe_enabled && !host->hsq_enabled) mq->tag_set.queue_depth = min_t(int, card->ext_csd.cmdq_depth, host->cqe_qdepth); else mq->tag_set.queue_depth = MMC_QUEUE_DEPTH; mq->tag_set.numa_node = NUMA_NO_NODE; mq->tag_set.flags = BLK_MQ_F_BLOCKING; mq->tag_set.nr_hw_queues = 1; mq->tag_set.cmd_size = sizeof(struct mmc_queue_req); mq->tag_set.driver_data = mq;
/* * Since blk_mq_alloc_tag_set() calls .init_request() of mmc_mq_ops, * the host->can_dma_map_merge should be set before to get max_segs * from mmc_get_max_segments(). */ if (mmc_merge_capable(host) && host->max_segs < MMC_DMA_MAP_MERGE_SEGMENTS && dma_get_merge_boundary(mmc_dev(host))) host->can_dma_map_merge = 1; else host->can_dma_map_merge = 0;
ret = blk_mq_alloc_tag_set(&mq->tag_set); if (ret) return ERR_PTR(ret);
disk = mmc_alloc_disk(mq, card, features); if (IS_ERR(disk)) blk_mq_free_tag_set(&mq->tag_set); return disk;}
void mmc_queue_suspend(struct mmc_queue *mq){ blk_mq_quiesce_queue(mq->queue);
/* * The host remains claimed while there are outstanding requests, so * simply claiming and releasing here ensures there are none. */ mmc_claim_host(mq->card->host); mmc_release_host(mq->card->host);}
void mmc_queue_resume(struct mmc_queue *mq){ blk_mq_unquiesce_queue(mq->queue);}
void mmc_cleanup_queue(struct mmc_queue *mq){ struct request_queue *q = mq->queue;
/* * The legacy code handled the possibility of being suspended, * so do that here too. */ if (blk_queue_quiesced(q)) blk_mq_unquiesce_queue(q);
/* * If the recovery completes the last (and only remaining) request in * the queue, and the card has been removed, we could end up here with * the recovery not quite finished yet, so cancel it. */ cancel_work_sync(&mq->recovery_work);
blk_mq_free_tag_set(&mq->tag_set);
/* * A request can be completed before the next request, potentially * leaving a complete_work with nothing to do. Such a work item might * still be queued at this point. Flush it. */ flush_work(&mq->complete_work);
mq->card = NULL;}
/* * Prepare the sg list(s) to be handed of to the host driver */unsigned int mmc_queue_map_sg(struct mmc_queue *mq, struct mmc_queue_req *mqrq){ struct request *req = mmc_queue_req_to_req(mqrq);
return blk_rq_map_sg(req, mqrq->sg);}