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8c405cdccc
The patches were generated from the RPi repo with the following command: git format-patch v6.6.34..rpi-6.1.y Some patches needed rebasing and, as usual, the applied and reverted, wireless drivers, Github workflows, READMEs and defconfigs patches were removed. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
112 lines
3.0 KiB
Diff
112 lines
3.0 KiB
Diff
From a6f14ebd60346418df6cb750c9e36563bd887720 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Thu, 18 Jan 2024 14:32:16 +0000
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Subject: [PATCH 0843/1085] mmc: bcm2835-sdhost: use Host Software Queueing
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mechanism
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See commit 511ce378e16f ("mmc: Add MMC host software queue support")
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Introduced in 5.8, this feature lets the block layer issue up to 2
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pending requests to the MMC layer which in certain cases can improve
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throughput, but in the case of this driver can significantly reduce
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context switching when performing random reads.
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On bcm2837 with a performant class A1 card, context switches under FIO
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random 4k reads go from ~8800 per second to ~5800, with a reduction in
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hardIRQs per second from ~5800 to ~4000. There is no appreciable
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difference in throughput.
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For bcm2835, and for workloads other than random read, HSQ is a wash in
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terms of throughput and CPU load.
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So, use it by default.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/mmc/host/Kconfig | 1 +
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drivers/mmc/host/bcm2835-sdhost.c | 27 ++++++++++++++++++++++-----
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2 files changed, 23 insertions(+), 5 deletions(-)
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--- a/drivers/mmc/host/Kconfig
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+++ b/drivers/mmc/host/Kconfig
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@@ -37,6 +37,7 @@ config MMC_BCM2835_PIO_DMA_BARRIER
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config MMC_BCM2835_SDHOST
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tristate "Support for the SDHost controller on BCM2708/9"
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depends on ARCH_BCM2835
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+ select MMC_HSQ
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help
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This selects the SDHost controller on BCM2835/6.
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--- a/drivers/mmc/host/bcm2835-sdhost.c
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+++ b/drivers/mmc/host/bcm2835-sdhost.c
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@@ -57,6 +57,7 @@
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/* For mmc_card_blockaddr */
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#include "../core/card.h"
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+#include "mmc_hsq.h"
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#define DRIVER_NAME "sdhost-bcm2835"
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@@ -1891,13 +1892,16 @@ static void bcm2835_sdhost_tasklet_finis
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mmc_hostname(host->mmc));
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}
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- mmc_request_done(host->mmc, mrq);
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+ if (!mmc_hsq_finalize_request(host->mmc, mrq))
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+ mmc_request_done(host->mmc, mrq);
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log_event("TSK>", mrq, 0);
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}
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-int bcm2835_sdhost_add_host(struct bcm2835_host *host)
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+int bcm2835_sdhost_add_host(struct platform_device *pdev)
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{
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+ struct bcm2835_host *host = platform_get_drvdata(pdev);
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struct mmc_host *mmc;
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+ struct mmc_hsq *hsq;
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struct dma_slave_config cfg;
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char pio_limit_string[20];
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int ret;
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@@ -1992,6 +1996,16 @@ int bcm2835_sdhost_add_host(struct bcm28
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goto untasklet;
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}
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+ hsq = devm_kzalloc(&pdev->dev, sizeof(*hsq), GFP_KERNEL);
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+ if (!hsq) {
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+ ret = -ENOMEM;
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+ goto free_irq;
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+ }
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+
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+ ret = mmc_hsq_init(hsq, host->mmc);
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+ if (ret)
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+ goto free_irq;
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+
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mmc_add_host(mmc);
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pio_limit_string[0] = '\0';
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@@ -2004,6 +2018,9 @@ int bcm2835_sdhost_add_host(struct bcm28
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return 0;
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+free_irq:
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+ free_irq(host->irq, host);
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+
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untasklet:
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tasklet_kill(&host->finish_tasklet);
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@@ -2134,12 +2151,12 @@ static int bcm2835_sdhost_probe(struct p
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host->firmware_sets_cdiv = (msg[1] != ~0);
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- ret = bcm2835_sdhost_add_host(host);
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+ platform_set_drvdata(pdev, host);
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+
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+ ret = bcm2835_sdhost_add_host(pdev);
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if (ret)
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goto err;
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- platform_set_drvdata(pdev, host);
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-
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pr_debug("bcm2835_sdhost_probe -> OK\n");
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return 0;
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