From: tip-bot for Thomas Gleixner <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, eranian@google.com,
Suravee.Suthikulpanit@amd.com, tglx@linutronix.de,
ashok.raj@intel.com, mingo@kernel.org, ravi.v.shankar@intel.com,
peterz@infradead.org, hpa@zytor.com, andi.kleen@intel.com,
ricardo.neri-calderon@linux.intel.com
Subject: [tip:x86/timers] x86/hpet: Add function to select a /dev/hpet channel
Date: Thu, 27 Jun 2019 16:48:17 -0700 [thread overview]
Message-ID: <tip-af5a1dadf3fcf673906af1a1129b2b7528494ee5@git.kernel.org> (raw)
In-Reply-To: <20190623132436.002758910@linutronix.de>
Commit-ID: af5a1dadf3fcf673906af1a1129b2b7528494ee5
Gitweb: https://git.kernel.org/tip/af5a1dadf3fcf673906af1a1129b2b7528494ee5
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Sun, 23 Jun 2019 15:24:01 +0200
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Fri, 28 Jun 2019 00:57:23 +0200
x86/hpet: Add function to select a /dev/hpet channel
If CONFIG_HPET=y is enabled the x86 specific HPET code should reserve at
least one channel for the /dev/hpet character device, so that not all
channels are absorbed for per CPU clockevent devices.
Create a function to assign HPET_MODE_DEVICE so the rework of the
clockevents allocation code can utilize the mode information instead of
reducing the number of evaluated channels by #ifdef hackery.
The function is not yet used, but provided as a separate patch for ease of
review. It will be used when the rework of the clockevent selection takes
place.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Andi Kleen <andi.kleen@intel.com>
Cc: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Link: https://lkml.kernel.org/r/20190623132436.002758910@linutronix.de
---
arch/x86/kernel/hpet.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 3a8ec363d569..640ff75cc523 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -228,8 +228,25 @@ static void __init hpet_reserve_platform_timers(void)
hpet_alloc(&hd);
}
+
+static void __init hpet_select_device_channel(void)
+{
+ int i;
+
+ for (i = 0; i < hpet_base.nr_channels; i++) {
+ struct hpet_channel *hc = hpet_base.channels + i;
+
+ /* Associate the first unused channel to /dev/hpet */
+ if (hc->mode == HPET_MODE_UNUSED) {
+ hc->mode = HPET_MODE_DEVICE;
+ return;
+ }
+ }
+}
+
#else
static inline void hpet_reserve_platform_timers(void) { }
+static inline void hpet_select_device_channel(void) {}
#endif
/* Common HPET functions */
next prev parent reply other threads:[~2019-06-27 23:48 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-23 13:23 [patch 00/29] x86/hpet: Cleanup the channel management Thomas Gleixner
2019-06-23 13:23 ` [patch 01/29] x86/hpet: Simplify CPU online code Thomas Gleixner
2019-06-27 23:34 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 02/29] x86/hpet: Replace printk(KERN...) with pr_...() Thomas Gleixner
2019-06-27 23:34 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 03/29] x86/hpet: Restructure init code Thomas Gleixner
2019-06-27 23:35 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 04/29] x86/hpet: Remove pointless x86-64 specific #include Thomas Gleixner
2019-06-27 23:36 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 05/29] x86/hpet: Remove unused parameter from hpet_next_event() Thomas Gleixner
2019-06-27 23:36 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 06/29] x86/hpet: Remove the unused hpet_msi_read() function Thomas Gleixner
2019-06-27 23:37 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 07/29] x86/hpet: Mark init functions __init Thomas Gleixner
2019-06-27 23:38 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 08/29] x86/hpet: Sanitize stub functions Thomas Gleixner
2019-06-27 23:39 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 09/29] x86/hpet: Move static and global variables to one place Thomas Gleixner
2019-06-27 23:39 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 10/29] x86/hpet: Shuffle code around for readability sake Thomas Gleixner
2019-06-27 23:40 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 11/29] x86/hpet: Separate counter check out of clocksource register code Thomas Gleixner
2019-06-27 23:41 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 12/29] x86/hpet: Simplify counter validation Thomas Gleixner
2019-06-27 23:41 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 13/29] x86/hpet: Decapitalize and rename EVT_TO_HPET_DEV Thomas Gleixner
2019-06-27 23:42 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 14/29] x86/hpet: Remove not required includes Thomas Gleixner
2019-06-27 23:43 ` [tip:x86/timers] " tip-bot for Ingo Molnar
2019-06-23 13:23 ` [patch 15/29] x86/hpet: Make naming consistent Thomas Gleixner
2019-06-27 23:44 ` [tip:x86/timers] " tip-bot for Ingo Molnar
2019-06-23 13:23 ` [patch 16/29] x86/hpet: Clean up comments Thomas Gleixner
2019-06-27 23:44 ` [tip:x86/timers] " tip-bot for Ingo Molnar
2019-06-23 13:23 ` [patch 17/29] x86/hpet: Coding style cleanup Thomas Gleixner
2019-06-27 23:45 ` [tip:x86/timers] " tip-bot for Ingo Molnar
2019-06-23 13:23 ` [patch 18/29] x86/hpet: Introduce struct hpet_base and struct hpet_channel Thomas Gleixner
2019-06-27 23:46 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:23 ` [patch 19/29] x86/hpet: Use cached channel data Thomas Gleixner
2019-06-27 23:46 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 20/29] x86/hpet: Add mode information to struct hpet_channel Thomas Gleixner
2019-06-27 23:47 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 21/29] x86/hpet: Add function to select a /dev/hpet channel Thomas Gleixner
2019-06-27 23:48 ` tip-bot for Thomas Gleixner [this message]
2019-06-23 13:24 ` [patch 22/29] x86/hpet: Rename variables to prepare for switching to channels Thomas Gleixner
2019-06-27 23:49 ` [tip:x86/timers] " tip-bot for Ingo Molnar
2019-06-23 13:24 ` [patch 23/29] x86/hpet: Move clockevents into channels Thomas Gleixner
2019-06-27 23:49 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 24/29] x86/hpet: Use cached info instead of extra flags Thomas Gleixner
2019-06-26 21:20 ` Ingo Molnar
2019-06-27 23:50 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 25/29] x86/hpet: Wrap legacy clockevent in hpet_channel Thomas Gleixner
2019-06-27 23:51 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 26/29] x86/hpet: Consolidate clockevent functions Thomas Gleixner
2019-06-26 21:17 ` Ingo Molnar
2019-06-27 22:44 ` Thomas Gleixner
2019-06-27 22:53 ` Thomas Gleixner
2019-06-28 8:32 ` Ingo Molnar
2019-06-27 23:51 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 27/29] x86/hpet: Carve out shareable parts of init_one_hpet_msi_clockevent() Thomas Gleixner
2019-06-27 23:52 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 28/29] x86/hpet: Use common init for legacy clockevent Thomas Gleixner
2019-06-26 21:13 ` Ingo Molnar
2019-06-27 23:53 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-23 13:24 ` [patch 29/29] x86/hpet: Use channel for legacy clockevent storage Thomas Gleixner
2019-06-27 23:53 ` [tip:x86/timers] " tip-bot for Thomas Gleixner
2019-06-26 21:22 ` [patch 00/29] x86/hpet: Cleanup the channel management Ingo Molnar
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