Commit 3f22421f authored by Hector Martin's avatar Hector Martin Committed by Keith Busch
Browse files

apple-nvme: Support coprocessors left idle 



iBoot on at least some firmwares/machines leaves ANS2 running, requiring
a wake command instead of a CPU boot (and if we reset ANS2 in that
state, everything breaks).

Only stop the CPU if RTKit was running, and only do the reset dance if
the CPU is stopped.

Normal shutdown handoff:
- RTKit not yet running
- CPU detected not running
- Reset
- CPU powerup
- RTKit boot wait

ANS2 left running/idle:
- RTKit not yet running
- CPU detected running
- RTKit wake message

Sleep/resume cycle:
- RTKit shutdown
- CPU stopped
- (sleep here)
- CPU detected not running
- Reset
- CPU powerup
- RTKit boot wait

Shutdown or device removal:
- RTKit shutdown
- CPU stopped

Therefore, the CPU running bit serves as a consistent flag of whether
the coprocessor is fully stopped or just idle.

Signed-off-by: default avatarHector Martin <marcan@marcan.st>
Reviewed-by: default avatarNeal Gompa <neal@gompa.dev>
Reviewed-by: default avatarSven Peter <sven@svenpeter.dev>
Signed-off-by: default avatarAlyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
parent eefa72a1

drivers/nvme/host/apple.c

+36 −17
Original line number Diff line number Diff line
@@ -1011,9 +1011,16 @@ static void apple_nvme_reset_work(struct work_struct *work) 
		ret = apple_rtkit_shutdown(anv->rtk);

		if (ret)

			goto out;

	}



		writel(0, anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);

	}



	/*

	 * Only do the soft-reset if the CPU is not running, which means either we

	 * or the previous stage shut it down cleanly.

	 */

	if (!(readl(anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL) &

		APPLE_ANS_COPROC_CPU_CONTROL_RUN)) {



		ret = reset_control_assert(anv->reset);

		if (ret)
@@ -1029,7 +1036,12 @@ static void apple_nvme_reset_work(struct work_struct *work) 


		writel(APPLE_ANS_COPROC_CPU_CONTROL_RUN,

		       anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);



		ret = apple_rtkit_boot(anv->rtk);

	} else {

		ret = apple_rtkit_wake(anv->rtk);

	}



	if (ret) {

		dev_err(anv->dev, "ANS did not boot");

		goto out;
@@ -1565,9 +1577,12 @@ static void apple_nvme_remove(struct platform_device *pdev) 
	apple_nvme_disable(anv, true);

	nvme_uninit_ctrl(&anv->ctrl);



	if (apple_rtkit_is_running(anv->rtk))

	if (apple_rtkit_is_running(anv->rtk)) {

		apple_rtkit_shutdown(anv->rtk);



		writel(0, anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);

	}



	apple_nvme_detach_genpd(anv);

}
@@ -1576,8 +1591,11 @@ static void apple_nvme_shutdown(struct platform_device *pdev) 
	struct apple_nvme *anv = platform_get_drvdata(pdev);



	apple_nvme_disable(anv, true);

	if (apple_rtkit_is_running(anv->rtk))

	if (apple_rtkit_is_running(anv->rtk)) {

		apple_rtkit_shutdown(anv->rtk);



		writel(0, anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);

	}

}



static int apple_nvme_resume(struct device *dev)
@@ -1594,10 +1612,11 @@ static int apple_nvme_suspend(struct device *dev) 


	apple_nvme_disable(anv, true);



	if (apple_rtkit_is_running(anv->rtk))

	if (apple_rtkit_is_running(anv->rtk)) {

		ret = apple_rtkit_shutdown(anv->rtk);



		writel(0, anv->mmio_coproc + APPLE_ANS_COPROC_CPU_CONTROL);

	}



	return ret;

}