![Linus Torvalds](/assets/img/avatar_default.png)
- Continue to re-factor code to prepare for eMMC CMDQ and blkmq support - Introduce queue semantics to prepare for eMMC CMDQ and blkmq support - Add helper functions to manage temporary enable/disable of eMMC CMDQ - Improve wait-busy detection for SDIO MMC host: - cavium: Add driver to support Cavium controllers - cavium: Extend Cavium driver to support Octeon SOCs and ThunderX SOCs - bcm2835: Add new driver for Broadcom BCM2835 controller - sdhci-xenon: Add driver to support Marvell Xenon SDHCI controller - sdhci-tegra: Add support for the Tegra186 variant - sdhci-of-esdhc: Support for UHS-I SD cards - sdhci-of-esdhc: Support for eMMC HS200 cards - sdhci-cadence: Add eMMC HS400 enhanced strobe support - sdhci-esdhc-imx: Reset tuning circuit when needed - sdhci-pci: Modernize and clean-up some PM related code - sdhci-pci: Avoid re-tuning at runtime PM for some Intel devices - sdhci-pci|acpi: Use aggressive PM for some Intel BYT controllers - sdhci: Re-factoring and modernizations - sdhci: Optimize delay loops - sdhci: Improve register dump print format - sdhci: Add support for the Command Queue Engine - meson-gx: Various improvements and clean-ups - meson-gx: Add support for CMD23 - meson-gx: Basic tuning support to avoid CRC errors - s3cmci: Enable probing via DT - mediatek: Improve tuning support for eMMC HS200 and HS400 mode - tmio: Improve DMA support - tmio: Use correct response for CMD12 - dw_mmc: Minor improvements and clean-ups -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJZCF8JAAoJEP4mhCVzWIwpjikP/iLwYZOP+aNl1wvHXJ7/UtOB bonqPPRLfW6mJkiphZyjnf3ZldS8DoUYp1Jh8gVsWoOPZhFuzAyFTGRJA5t0sEtH WzV0X72qzfDESekP1KGZZPQSfqfo/UnIEwa7U0Rlw8jlpvVsbXimqw54e+hCE0n8 bhZjQihxOkXofCMnS4CxFJwbSCNEkdw6cMgNk72P8KAQllbOA3UbOurAbRUT0I6S 3H3+8uKh0fZp3BYGV5y8DxzqIRaCz3ed8TTuGFc3YU8sNGEF67AwcbBzfDaegNsR qNPU12gccOU5IY8gbG/MMoEpSXodEj0RCW2uDqt+QT289eh3SpPLlS2en/iZj4t6 F1xnMEg48GpYJbiB4YImfK49c3RQXAtcdwf/v8SUcE4FUktuOsyQIozMglYIsUd1 fGZ3yr0caRBnwAkbj5GXaG3/VXzMExKYalf990kUuxhHHGuRQLLg0SHkfWNhJNA1 mw0XHXTrC9GO32PPfylgkdGOOCnlP36sbBPhGQqJUH6yeiy1wO4xoCVSO8iVI5J9 8W9BGgSYJRlPaItmH2syQEO9dSRMS5BLy7oICTBn+LsszXwMbuNn6cFBkhF1Xxwy 2MHU+b6EMn4V4qrp0c8gVfMraXkL9H7BwL9aCv1UTuti7d/7NM7G1wNW9qGala3Y 9cU8nzC1A521kfmDNPPO =p+Hb -----END PGP SIGNATURE----- Merge tag 'mmc-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc Pull MMC updates from Ulf Hansson: "MMC core: - Continue to re-factor code to prepare for eMMC CMDQ and blkmq support - Introduce queue semantics to prepare for eMMC CMDQ and blkmq support - Add helper functions to manage temporary enable/disable of eMMC CMDQ - Improve wait-busy detection for SDIO MMC host: - cavium: Add driver to support Cavium controllers - cavium: Extend Cavium driver to support Octeon and ThunderX SOCs - bcm2835: Add new driver for Broadcom BCM2835 controller - sdhci-xenon: Add driver to support Marvell Xenon SDHCI controller - sdhci-tegra: Add support for the Tegra186 variant - sdhci-of-esdhc: Support for UHS-I SD cards - sdhci-of-esdhc: Support for eMMC HS200 cards - sdhci-cadence: Add eMMC HS400 enhanced strobe support - sdhci-esdhc-imx: Reset tuning circuit when needed - sdhci-pci: Modernize and clean-up some PM related code - sdhci-pci: Avoid re-tuning at runtime PM for some Intel devices - sdhci-pci|acpi: Use aggressive PM for some Intel BYT controllers - sdhci: Re-factoring and modernizations - sdhci: Optimize delay loops - sdhci: Improve register dump print format - sdhci: Add support for the Command Queue Engine - meson-gx: Various improvements and clean-ups - meson-gx: Add support for CMD23 - meson-gx: Basic tuning support to avoid CRC errors - s3cmci: Enable probing via DT - mediatek: Improve tuning support for eMMC HS200 and HS400 mode - tmio: Improve DMA support - tmio: Use correct response for CMD12 - dw_mmc: Minor improvements and clean-ups" * tag 'mmc-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc: (148 commits) mmc: sdhci-of-esdhc: limit SD clock for ls1012a/ls1046a mmc: sdhci-of-esdhc: poll ESDHC_CLOCK_STABLE bit with udelay mmc: sdhci-xenon: Fix default value of LOGIC_TIMING_ADJUST for eMMC5.0 PHY mmc: sdhci-xenon: Fix the work flow in xenon_remove(). MIPS: Octeon: cavium_octeon_defconfig: Enable Octeon MMC mmc: sdhci-xenon: Remove redundant dev_err call in get_dt_pad_ctrl_data() mmc: cavium: Use module_pci_driver to simplify the code mmc: cavium: Add MMC support for Octeon SOCs. mmc: cavium: Fix detection of block or byte addressing. mmc: core: Export API to allow hosts to get the card address mmc: sdio: Fix sdio wait busy implement limitation mmc: sdhci-esdhc-imx: reset tuning circuit when power on mmc card clk: apn806: fix spelling mistake: "mising" -> "missing" mmc: sdhci-of-esdhc: add delay between tuning cycles mmc: sdhci: Control the delay between tuning commands mmc: sdhci-of-esdhc: add tuning support mmc: sdhci-of-esdhc: add support for signal voltage switch mmc: sdhci-of-esdhc: add peripheral clock support mmc: sdhci-pci: Allow for 3 bytes from Intel DSM mmc: cavium: Fix a shift wrapping bug ...
544 lines
12 KiB
C
544 lines
12 KiB
C
/*
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* Copyright (C) 2003 Russell King, All Rights Reserved.
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* Copyright 2006-2007 Pierre Ossman
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*
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* This program 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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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-mapping.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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#include "queue.h"
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#include "block.h"
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#include "core.h"
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#include "card.h"
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#define MMC_QUEUE_BOUNCESZ 65536
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/*
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* Prepare a MMC request. This just filters out odd stuff.
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*/
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static int mmc_prep_request(struct request_queue *q, struct request *req)
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{
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struct mmc_queue *mq = q->queuedata;
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if (mq && (mmc_card_removed(mq->card) || mmc_access_rpmb(mq)))
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return BLKPREP_KILL;
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req->rq_flags |= RQF_DONTPREP;
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return BLKPREP_OK;
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}
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struct mmc_queue_req *mmc_queue_req_find(struct mmc_queue *mq,
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struct request *req)
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{
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struct mmc_queue_req *mqrq;
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int i = ffz(mq->qslots);
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if (i >= mq->qdepth)
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return NULL;
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mqrq = &mq->mqrq[i];
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WARN_ON(mqrq->req || mq->qcnt >= mq->qdepth ||
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test_bit(mqrq->task_id, &mq->qslots));
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mqrq->req = req;
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mq->qcnt += 1;
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__set_bit(mqrq->task_id, &mq->qslots);
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return mqrq;
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}
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void mmc_queue_req_free(struct mmc_queue *mq,
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struct mmc_queue_req *mqrq)
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{
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WARN_ON(!mqrq->req || mq->qcnt < 1 ||
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!test_bit(mqrq->task_id, &mq->qslots));
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mqrq->req = NULL;
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mq->qcnt -= 1;
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__clear_bit(mqrq->task_id, &mq->qslots);
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}
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static int mmc_queue_thread(void *d)
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{
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struct mmc_queue *mq = d;
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struct request_queue *q = mq->queue;
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struct mmc_context_info *cntx = &mq->card->host->context_info;
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current->flags |= PF_MEMALLOC;
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down(&mq->thread_sem);
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do {
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struct request *req;
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spin_lock_irq(q->queue_lock);
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set_current_state(TASK_INTERRUPTIBLE);
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req = blk_fetch_request(q);
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mq->asleep = false;
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cntx->is_waiting_last_req = false;
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cntx->is_new_req = false;
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if (!req) {
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/*
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* Dispatch queue is empty so set flags for
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* mmc_request_fn() to wake us up.
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*/
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if (mq->qcnt)
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cntx->is_waiting_last_req = true;
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else
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mq->asleep = true;
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}
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spin_unlock_irq(q->queue_lock);
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if (req || mq->qcnt) {
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set_current_state(TASK_RUNNING);
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mmc_blk_issue_rq(mq, req);
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cond_resched();
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} else {
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if (kthread_should_stop()) {
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set_current_state(TASK_RUNNING);
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break;
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}
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up(&mq->thread_sem);
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schedule();
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down(&mq->thread_sem);
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}
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} while (1);
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up(&mq->thread_sem);
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return 0;
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}
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/*
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* Generic MMC request handler. This is called for any queue on a
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* particular host. When the host is not busy, we look for a request
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* on any queue on this host, and attempt to issue it. This may
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* not be the queue we were asked to process.
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*/
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static void mmc_request_fn(struct request_queue *q)
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{
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struct mmc_queue *mq = q->queuedata;
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struct request *req;
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struct mmc_context_info *cntx;
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if (!mq) {
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while ((req = blk_fetch_request(q)) != NULL) {
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req->rq_flags |= RQF_QUIET;
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__blk_end_request_all(req, -EIO);
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}
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return;
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}
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cntx = &mq->card->host->context_info;
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if (cntx->is_waiting_last_req) {
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cntx->is_new_req = true;
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wake_up_interruptible(&cntx->wait);
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}
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if (mq->asleep)
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wake_up_process(mq->thread);
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}
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static struct scatterlist *mmc_alloc_sg(int sg_len)
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{
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struct scatterlist *sg;
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sg = kmalloc_array(sg_len, sizeof(*sg), GFP_KERNEL);
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if (sg)
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sg_init_table(sg, sg_len);
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return sg;
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}
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static void mmc_queue_setup_discard(struct request_queue *q,
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struct mmc_card *card)
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{
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unsigned max_discard;
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max_discard = mmc_calc_max_discard(card);
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if (!max_discard)
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return;
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queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
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blk_queue_max_discard_sectors(q, max_discard);
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q->limits.discard_granularity = card->pref_erase << 9;
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/* granularity must not be greater than max. discard */
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if (card->pref_erase > max_discard)
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q->limits.discard_granularity = 0;
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if (mmc_can_secure_erase_trim(card))
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queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, q);
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}
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static void mmc_queue_req_free_bufs(struct mmc_queue_req *mqrq)
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{
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kfree(mqrq->bounce_sg);
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mqrq->bounce_sg = NULL;
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kfree(mqrq->sg);
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mqrq->sg = NULL;
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kfree(mqrq->bounce_buf);
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mqrq->bounce_buf = NULL;
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}
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static void mmc_queue_reqs_free_bufs(struct mmc_queue_req *mqrq, int qdepth)
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{
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int i;
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for (i = 0; i < qdepth; i++)
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mmc_queue_req_free_bufs(&mqrq[i]);
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}
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static void mmc_queue_free_mqrqs(struct mmc_queue_req *mqrq, int qdepth)
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{
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mmc_queue_reqs_free_bufs(mqrq, qdepth);
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kfree(mqrq);
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}
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static struct mmc_queue_req *mmc_queue_alloc_mqrqs(int qdepth)
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{
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struct mmc_queue_req *mqrq;
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int i;
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mqrq = kcalloc(qdepth, sizeof(*mqrq), GFP_KERNEL);
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if (mqrq) {
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for (i = 0; i < qdepth; i++)
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mqrq[i].task_id = i;
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}
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return mqrq;
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}
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#ifdef CONFIG_MMC_BLOCK_BOUNCE
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static int mmc_queue_alloc_bounce_bufs(struct mmc_queue_req *mqrq, int qdepth,
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unsigned int bouncesz)
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{
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int i;
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for (i = 0; i < qdepth; i++) {
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mqrq[i].bounce_buf = kmalloc(bouncesz, GFP_KERNEL);
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if (!mqrq[i].bounce_buf)
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return -ENOMEM;
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mqrq[i].sg = mmc_alloc_sg(1);
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if (!mqrq[i].sg)
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return -ENOMEM;
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mqrq[i].bounce_sg = mmc_alloc_sg(bouncesz / 512);
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if (!mqrq[i].bounce_sg)
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return -ENOMEM;
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}
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return 0;
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}
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static bool mmc_queue_alloc_bounce(struct mmc_queue_req *mqrq, int qdepth,
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unsigned int bouncesz)
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{
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int ret;
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ret = mmc_queue_alloc_bounce_bufs(mqrq, qdepth, bouncesz);
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if (ret)
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mmc_queue_reqs_free_bufs(mqrq, qdepth);
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return !ret;
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}
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static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
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{
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unsigned int bouncesz = MMC_QUEUE_BOUNCESZ;
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if (host->max_segs != 1)
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return 0;
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if (bouncesz > host->max_req_size)
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bouncesz = host->max_req_size;
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if (bouncesz > host->max_seg_size)
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bouncesz = host->max_seg_size;
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if (bouncesz > host->max_blk_count * 512)
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bouncesz = host->max_blk_count * 512;
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if (bouncesz <= 512)
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return 0;
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return bouncesz;
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}
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#else
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static inline bool mmc_queue_alloc_bounce(struct mmc_queue_req *mqrq,
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int qdepth, unsigned int bouncesz)
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{
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return false;
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}
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static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
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{
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return 0;
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}
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#endif
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static int mmc_queue_alloc_sgs(struct mmc_queue_req *mqrq, int qdepth,
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int max_segs)
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{
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int i;
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for (i = 0; i < qdepth; i++) {
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mqrq[i].sg = mmc_alloc_sg(max_segs);
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if (!mqrq[i].sg)
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return -ENOMEM;
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}
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return 0;
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}
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void mmc_queue_free_shared_queue(struct mmc_card *card)
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{
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if (card->mqrq) {
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mmc_queue_free_mqrqs(card->mqrq, card->qdepth);
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card->mqrq = NULL;
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}
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}
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static int __mmc_queue_alloc_shared_queue(struct mmc_card *card, int qdepth)
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{
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struct mmc_host *host = card->host;
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struct mmc_queue_req *mqrq;
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unsigned int bouncesz;
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int ret = 0;
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if (card->mqrq)
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return -EINVAL;
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mqrq = mmc_queue_alloc_mqrqs(qdepth);
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if (!mqrq)
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return -ENOMEM;
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card->mqrq = mqrq;
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card->qdepth = qdepth;
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bouncesz = mmc_queue_calc_bouncesz(host);
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if (bouncesz && !mmc_queue_alloc_bounce(mqrq, qdepth, bouncesz)) {
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bouncesz = 0;
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pr_warn("%s: unable to allocate bounce buffers\n",
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mmc_card_name(card));
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}
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card->bouncesz = bouncesz;
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if (!bouncesz) {
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ret = mmc_queue_alloc_sgs(mqrq, qdepth, host->max_segs);
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if (ret)
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goto out_err;
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}
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return ret;
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out_err:
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mmc_queue_free_shared_queue(card);
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return ret;
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}
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int mmc_queue_alloc_shared_queue(struct mmc_card *card)
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{
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return __mmc_queue_alloc_shared_queue(card, 2);
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}
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/**
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* mmc_init_queue - initialise a queue structure.
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* @mq: mmc queue
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* @card: mmc card to attach this queue
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* @lock: queue lock
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* @subname: partition subname
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*
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* Initialise a MMC card request queue.
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*/
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int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
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spinlock_t *lock, const char *subname)
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{
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struct mmc_host *host = card->host;
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u64 limit = BLK_BOUNCE_HIGH;
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int ret = -ENOMEM;
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if (mmc_dev(host)->dma_mask && *mmc_dev(host)->dma_mask)
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limit = (u64)dma_max_pfn(mmc_dev(host)) << PAGE_SHIFT;
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mq->card = card;
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mq->queue = blk_init_queue(mmc_request_fn, lock);
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if (!mq->queue)
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return -ENOMEM;
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mq->mqrq = card->mqrq;
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mq->qdepth = card->qdepth;
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mq->queue->queuedata = mq;
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blk_queue_prep_rq(mq->queue, mmc_prep_request);
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queue_flag_set_unlocked(QUEUE_FLAG_NONROT, mq->queue);
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queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, mq->queue);
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if (mmc_can_erase(card))
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mmc_queue_setup_discard(mq->queue, card);
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if (card->bouncesz) {
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blk_queue_bounce_limit(mq->queue, BLK_BOUNCE_ANY);
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blk_queue_max_hw_sectors(mq->queue, card->bouncesz / 512);
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blk_queue_max_segments(mq->queue, card->bouncesz / 512);
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blk_queue_max_segment_size(mq->queue, card->bouncesz);
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} else {
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blk_queue_bounce_limit(mq->queue, limit);
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blk_queue_max_hw_sectors(mq->queue,
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min(host->max_blk_count, host->max_req_size / 512));
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blk_queue_max_segments(mq->queue, host->max_segs);
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blk_queue_max_segment_size(mq->queue, host->max_seg_size);
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}
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sema_init(&mq->thread_sem, 1);
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mq->thread = kthread_run(mmc_queue_thread, mq, "mmcqd/%d%s",
|
|
host->index, subname ? subname : "");
|
|
|
|
if (IS_ERR(mq->thread)) {
|
|
ret = PTR_ERR(mq->thread);
|
|
goto cleanup_queue;
|
|
}
|
|
|
|
return 0;
|
|
|
|
cleanup_queue:
|
|
mq->mqrq = NULL;
|
|
blk_cleanup_queue(mq->queue);
|
|
return ret;
|
|
}
|
|
|
|
void mmc_cleanup_queue(struct mmc_queue *mq)
|
|
{
|
|
struct request_queue *q = mq->queue;
|
|
unsigned long flags;
|
|
|
|
/* Make sure the queue isn't suspended, as that will deadlock */
|
|
mmc_queue_resume(mq);
|
|
|
|
/* Then terminate our worker thread */
|
|
kthread_stop(mq->thread);
|
|
|
|
/* Empty the queue */
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
q->queuedata = NULL;
|
|
blk_start_queue(q);
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
|
|
mq->mqrq = NULL;
|
|
mq->card = NULL;
|
|
}
|
|
EXPORT_SYMBOL(mmc_cleanup_queue);
|
|
|
|
/**
|
|
* mmc_queue_suspend - suspend a MMC request queue
|
|
* @mq: MMC queue to suspend
|
|
*
|
|
* Stop the block request queue, and wait for our thread to
|
|
* complete any outstanding requests. This ensures that we
|
|
* won't suspend while a request is being processed.
|
|
*/
|
|
void mmc_queue_suspend(struct mmc_queue *mq)
|
|
{
|
|
struct request_queue *q = mq->queue;
|
|
unsigned long flags;
|
|
|
|
if (!mq->suspended) {
|
|
mq->suspended |= true;
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
blk_stop_queue(q);
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
|
|
down(&mq->thread_sem);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mmc_queue_resume - resume a previously suspended MMC request queue
|
|
* @mq: MMC queue to resume
|
|
*/
|
|
void mmc_queue_resume(struct mmc_queue *mq)
|
|
{
|
|
struct request_queue *q = mq->queue;
|
|
unsigned long flags;
|
|
|
|
if (mq->suspended) {
|
|
mq->suspended = false;
|
|
|
|
up(&mq->thread_sem);
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
blk_start_queue(q);
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
unsigned int sg_len;
|
|
size_t buflen;
|
|
struct scatterlist *sg;
|
|
int i;
|
|
|
|
if (!mqrq->bounce_buf)
|
|
return blk_rq_map_sg(mq->queue, mqrq->req, mqrq->sg);
|
|
|
|
sg_len = blk_rq_map_sg(mq->queue, mqrq->req, mqrq->bounce_sg);
|
|
|
|
mqrq->bounce_sg_len = sg_len;
|
|
|
|
buflen = 0;
|
|
for_each_sg(mqrq->bounce_sg, sg, sg_len, i)
|
|
buflen += sg->length;
|
|
|
|
sg_init_one(mqrq->sg, mqrq->bounce_buf, buflen);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* If writing, bounce the data to the buffer before the request
|
|
* is sent to the host driver
|
|
*/
|
|
void mmc_queue_bounce_pre(struct mmc_queue_req *mqrq)
|
|
{
|
|
if (!mqrq->bounce_buf)
|
|
return;
|
|
|
|
if (rq_data_dir(mqrq->req) != WRITE)
|
|
return;
|
|
|
|
sg_copy_to_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
|
|
mqrq->bounce_buf, mqrq->sg[0].length);
|
|
}
|
|
|
|
/*
|
|
* If reading, bounce the data from the buffer after the request
|
|
* has been handled by the host driver
|
|
*/
|
|
void mmc_queue_bounce_post(struct mmc_queue_req *mqrq)
|
|
{
|
|
if (!mqrq->bounce_buf)
|
|
return;
|
|
|
|
if (rq_data_dir(mqrq->req) != READ)
|
|
return;
|
|
|
|
sg_copy_from_buffer(mqrq->bounce_sg, mqrq->bounce_sg_len,
|
|
mqrq->bounce_buf, mqrq->sg[0].length);
|
|
}
|