From: Sascha Hauer <sha@pengutronix.de> To: Saravana Kannan <saravanak@google.com> Cc: Andrew Lunn <andrew@lunn.ch>, Ulf Hansson <ulf.hansson@linaro.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Linus Walleij <linus.walleij@linaro.org>, Eric Dumazet <edumazet@google.com>, Pavel Machek <pavel@ucw.cz>, Will Deacon <will@kernel.org>, Kevin Hilman <khilman@kernel.org>, Russell King <linux@armlinux.org.uk>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, kernel-team@android.com, Len Brown <len.brown@intel.com>, linux-pm@vger.kernel.org, linux-gpio@vger.kernel.org, Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, David Ahern <dsahern@kernel.org>, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, kernel@pengutronix.de, netdev@vger.kernel.org, "David S. Miller" <davem@davemloft.net>, Heiner Kallweit <hkallweit1@gmail.com> Subject: Re: [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default Date: Wed, 22 Jun 2022 09:47:56 +0200 [thread overview] Message-ID: <20220622074756.GA1647@pengutronix.de> (raw) In-Reply-To: <20220601070707.3946847-8-saravanak@google.com> On Wed, Jun 01, 2022 at 12:07:03AM -0700, Saravana Kannan wrote: > Now that deferred_probe_timeout is non-zero by default, fw_devlink will > never permanently block the probing of devices. It'll try its best to > probe the devices in the right order and then finally let devices probe > even if their suppliers don't have any drivers. > > Signed-off-by: Saravana Kannan <saravanak@google.com> > --- > drivers/base/core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) As mentioned here: https://lore.kernel.org/lkml/20220622062027.994614-1-peng.fan@oss.nxp.com/ This patch has the effect that console UART devices which have "dmas" properties specified in the device tree get deferred for 10 to 20 seconds. This happens on i.MX and likely on other SoCs as well. On i.MX the dma channel is only requested at UART startup time and not at probe time. dma is not used for the console. Nevertheless with this driver probe defers until the dma engine driver is available. It shouldn't go in as-is. Sascha > > diff --git a/drivers/base/core.c b/drivers/base/core.c > index 61fdfe99b348..977b379a495b 100644 > --- a/drivers/base/core.c > +++ b/drivers/base/core.c > @@ -1613,7 +1613,7 @@ static int __init fw_devlink_setup(char *arg) > } > early_param("fw_devlink", fw_devlink_setup); > > -static bool fw_devlink_strict; > +static bool fw_devlink_strict = true; > static int __init fw_devlink_strict_setup(char *arg) > { > return strtobool(arg, &fw_devlink_strict); > -- > 2.36.1.255.ge46751e96f-goog > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Sascha Hauer <sha@pengutronix.de> To: Saravana Kannan <saravanak@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Kevin Hilman <khilman@kernel.org>, Ulf Hansson <ulf.hansson@linaro.org>, Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>, Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>, Andrew Lunn <andrew@lunn.ch>, Heiner Kallweit <hkallweit1@gmail.com>, Russell King <linux@armlinux.org.uk>, "David S. Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Linus Walleij <linus.walleij@linaro.org>, Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>, David Ahern <dsahern@kernel.org>, kernel-team@android.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, iommu@lists.linux-foundation.org, netdev@vger.kernel.org, linux-gpio@vger.kernel.org, kernel@pengutronix.de Subject: Re: [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default Date: Wed, 22 Jun 2022 09:47:56 +0200 [thread overview] Message-ID: <20220622074756.GA1647@pengutronix.de> (raw) In-Reply-To: <20220601070707.3946847-8-saravanak@google.com> On Wed, Jun 01, 2022 at 12:07:03AM -0700, Saravana Kannan wrote: > Now that deferred_probe_timeout is non-zero by default, fw_devlink will > never permanently block the probing of devices. It'll try its best to > probe the devices in the right order and then finally let devices probe > even if their suppliers don't have any drivers. > > Signed-off-by: Saravana Kannan <saravanak@google.com> > --- > drivers/base/core.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) As mentioned here: https://lore.kernel.org/lkml/20220622062027.994614-1-peng.fan@oss.nxp.com/ This patch has the effect that console UART devices which have "dmas" properties specified in the device tree get deferred for 10 to 20 seconds. This happens on i.MX and likely on other SoCs as well. On i.MX the dma channel is only requested at UART startup time and not at probe time. dma is not used for the console. Nevertheless with this driver probe defers until the dma engine driver is available. It shouldn't go in as-is. Sascha > > diff --git a/drivers/base/core.c b/drivers/base/core.c > index 61fdfe99b348..977b379a495b 100644 > --- a/drivers/base/core.c > +++ b/drivers/base/core.c > @@ -1613,7 +1613,7 @@ static int __init fw_devlink_setup(char *arg) > } > early_param("fw_devlink", fw_devlink_setup); > > -static bool fw_devlink_strict; > +static bool fw_devlink_strict = true; > static int __init fw_devlink_strict_setup(char *arg) > { > return strtobool(arg, &fw_devlink_strict); > -- > 2.36.1.255.ge46751e96f-goog > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
next prev parent reply other threads:[~2022-06-22 7:48 UTC|newest] Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-06-01 7:06 [PATCH v2 0/9] deferred_probe_timeout logic clean up Saravana Kannan via iommu 2022-06-01 7:06 ` Saravana Kannan 2022-06-01 7:06 ` [PATCH v2 1/9] PM: domains: Delete usage of driver_deferred_probe_check_state() Saravana Kannan 2022-06-01 7:06 ` Saravana Kannan via iommu 2022-06-09 11:44 ` Ulf Hansson 2022-06-09 11:44 ` Ulf Hansson 2022-06-09 19:29 ` Saravana Kannan 2022-06-09 19:29 ` Saravana Kannan via iommu 2022-06-21 7:28 ` Tony Lindgren 2022-06-21 7:28 ` Tony Lindgren 2022-06-21 19:34 ` Saravana Kannan 2022-06-21 19:34 ` Saravana Kannan via iommu 2022-06-22 4:58 ` Tony Lindgren 2022-06-22 4:58 ` Tony Lindgren 2022-06-22 19:09 ` Saravana Kannan 2022-06-22 19:09 ` Saravana Kannan via iommu 2022-06-23 7:01 ` Tony Lindgren 2022-06-23 7:01 ` Tony Lindgren 2022-06-23 8:21 ` Saravana Kannan 2022-06-23 8:21 ` Saravana Kannan via iommu 2022-06-27 9:10 ` Tony Lindgren 2022-06-27 9:10 ` Tony Lindgren 2022-06-30 23:10 ` Saravana Kannan 2022-06-30 23:10 ` Saravana Kannan via iommu 2022-06-30 23:26 ` Rob Herring 2022-06-30 23:26 ` Rob Herring 2022-06-30 23:30 ` Saravana Kannan 2022-06-30 23:30 ` Saravana Kannan via iommu 2022-07-01 5:33 ` Tony Lindgren 2022-07-01 5:33 ` Tony Lindgren 2022-07-01 6:12 ` Tony Lindgren 2022-07-01 6:12 ` Tony Lindgren 2022-07-01 8:10 ` Saravana Kannan 2022-07-01 8:10 ` Saravana Kannan via iommu 2022-07-01 8:26 ` Saravana Kannan via iommu 2022-07-01 8:26 ` Saravana Kannan 2022-07-01 13:00 ` Tony Lindgren 2022-07-01 13:00 ` Tony Lindgren 2022-07-12 7:12 ` Tony Lindgren 2022-07-13 0:49 ` Saravana Kannan 2022-07-13 8:06 ` Tony Lindgren 2022-07-01 15:08 ` Sudeep Holla 2022-07-01 15:08 ` Sudeep Holla 2022-07-01 19:13 ` Saravana Kannan 2022-07-01 19:13 ` Saravana Kannan via iommu 2022-07-05 8:44 ` Saravana Kannan 2022-07-05 8:44 ` Saravana Kannan via iommu 2022-07-01 7:38 ` Geert Uytterhoeven 2022-07-01 7:38 ` Geert Uytterhoeven 2022-06-23 12:08 ` Alexander Stein 2022-06-23 12:08 ` Alexander Stein 2022-07-01 0:37 ` Saravana Kannan 2022-07-01 0:37 ` Saravana Kannan via iommu 2022-07-01 6:01 ` (EXT) " Alexander Stein 2022-07-01 6:01 ` Alexander Stein 2022-07-01 7:02 ` Saravana Kannan 2022-07-01 7:02 ` Saravana Kannan via iommu 2022-07-04 7:07 ` (EXT) " Alexander Stein 2022-07-04 7:07 ` Alexander Stein 2022-07-05 1:24 ` Saravana Kannan 2022-07-05 1:24 ` Saravana Kannan via iommu 2022-07-06 13:02 ` Re: " Alexander Stein 2022-07-06 13:02 ` Alexander Stein 2022-07-13 0:45 ` Saravana Kannan 2022-07-14 6:41 ` Alexander Stein 2022-07-15 22:08 ` Saravana Kannan 2022-07-01 7:30 ` Geert Uytterhoeven 2022-07-01 7:30 ` Geert Uytterhoeven 2022-06-01 7:06 ` [PATCH v2 2/9] pinctrl: devicetree: " Saravana Kannan 2022-06-01 7:06 ` Saravana Kannan via iommu 2022-06-01 7:06 ` [PATCH v2 3/9] net: mdio: " Saravana Kannan 2022-06-01 7:06 ` Saravana Kannan via iommu 2022-07-05 9:11 ` Geert Uytterhoeven 2022-07-05 9:11 ` Geert Uytterhoeven 2022-07-13 1:40 ` Saravana Kannan 2022-07-13 11:39 ` Geert Uytterhoeven 2022-08-15 8:38 ` Geert Uytterhoeven 2022-06-01 7:07 ` [PATCH v2 4/9] driver core: Add wait_for_init_devices_probe helper function Saravana Kannan 2022-06-01 7:07 ` Saravana Kannan via iommu 2022-06-01 7:07 ` [PATCH v2 5/9] net: ipconfig: Relax fw_devlink if we need to mount a network rootfs Saravana Kannan 2022-06-01 7:07 ` Saravana Kannan via iommu 2022-06-01 7:07 ` [PATCH v2 6/9] Revert "driver core: Set default deferred_probe_timeout back to 0." Saravana Kannan 2022-06-01 7:07 ` Saravana Kannan via iommu 2022-07-20 17:31 ` Geert Uytterhoeven 2022-07-20 19:01 ` Saravana Kannan 2022-07-21 8:40 ` Geert Uytterhoeven 2022-06-01 7:07 ` [PATCH v2 7/9] driver core: Set fw_devlink.strict=1 by default Saravana Kannan 2022-06-01 7:07 ` Saravana Kannan via iommu 2022-06-22 7:47 ` Sascha Hauer [this message] 2022-06-22 7:47 ` Sascha Hauer 2022-06-22 8:44 ` Linus Walleij 2022-06-22 8:44 ` Linus Walleij 2022-06-22 10:52 ` Andy Shevchenko 2022-06-22 10:52 ` Andy Shevchenko 2022-06-22 11:18 ` Sascha Hauer 2022-06-22 11:18 ` Sascha Hauer 2022-06-22 19:40 ` Saravana Kannan via iommu 2022-06-22 19:40 ` Saravana Kannan 2022-06-22 20:35 ` Saravana Kannan 2022-06-22 20:35 ` Saravana Kannan via iommu 2022-06-22 22:30 ` Saravana Kannan 2022-06-22 22:30 ` Saravana Kannan via iommu 2022-06-28 13:09 ` Linus Walleij 2022-06-28 13:09 ` Linus Walleij 2022-06-01 7:07 ` [PATCH v2 8/9] iommu/of: Delete usage of driver_deferred_probe_check_state() Saravana Kannan 2022-06-01 7:07 ` Saravana Kannan via iommu 2022-08-19 14:26 ` Jean-Philippe Brucker 2022-06-01 7:07 ` [PATCH v2 9/9] driver core: Delete driver_deferred_probe_check_state() Saravana Kannan 2022-06-01 7:07 ` Saravana Kannan via iommu 2022-06-07 18:07 ` [PATCH v2 0/9] deferred_probe_timeout logic clean up Geert Uytterhoeven 2022-06-07 18:07 ` Geert Uytterhoeven 2022-06-08 0:55 ` Saravana Kannan via iommu 2022-06-08 0:55 ` Saravana Kannan 2022-06-08 4:17 ` Saravana Kannan via iommu 2022-06-08 4:17 ` Saravana Kannan 2022-06-08 10:25 ` Geert Uytterhoeven 2022-06-08 10:25 ` Geert Uytterhoeven 2022-06-08 18:12 ` Saravana Kannan 2022-06-08 18:12 ` Saravana Kannan via iommu 2022-06-08 18:47 ` Geert Uytterhoeven 2022-06-08 18:47 ` Geert Uytterhoeven 2022-06-08 21:07 ` Saravana Kannan 2022-06-08 21:07 ` Saravana Kannan via iommu 2022-06-08 22:49 ` Jakub Kicinski 2022-06-08 22:49 ` Jakub Kicinski 2022-06-08 23:15 ` Saravana Kannan via iommu 2022-06-08 23:15 ` Saravana Kannan
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