From: Julien Grall <julien.grall@arm.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu
Cc: james.morse@arm.com, marc.zyngier@arm.com,
julien.thierry@arm.com, suzuki.poulose@arm.com,
catalin.marinas@arm.com, will.deacon@arm.com,
Julien Grall <julien.grall@arm.com>
Subject: [RFC v2 08/14] arm64/mm: Split asid_inits in 2 parts
Date: Thu, 20 Jun 2019 14:06:02 +0100 [thread overview]
Message-ID: <20190620130608.17230-9-julien.grall@arm.com> (raw)
In-Reply-To: <20190620130608.17230-1-julien.grall@arm.com>
Move out the common initialization of the ASID allocator in a separate
function.
Signed-off-by: Julien Grall <julien.grall@arm.com>
---
arch/arm64/mm/context.c | 43 +++++++++++++++++++++++++++++++------------
1 file changed, 31 insertions(+), 12 deletions(-)
diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index beba8e5b4100..81bc3d365436 100644
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -271,31 +271,50 @@ asmlinkage void post_ttbr_update_workaround(void)
CONFIG_CAVIUM_ERRATUM_27456));
}
-static int asids_init(void)
+/*
+ * Initialize the ASID allocator
+ *
+ * @info: Pointer to the asid allocator structure
+ * @bits: Number of ASIDs available
+ * @asid_per_ctxt: Number of ASIDs to allocate per-context. ASIDs are
+ * allocated contiguously for a given context. This value should be a power of
+ * 2.
+ */
+static int asid_allocator_init(struct asid_info *info,
+ u32 bits, unsigned int asid_per_ctxt)
{
- struct asid_info *info = &asid_info;
-
- info->bits = get_cpu_asid_bits();
- info->ctxt_shift = ilog2(ASID_PER_CONTEXT);
+ info->bits = bits;
+ info->ctxt_shift = ilog2(asid_per_ctxt);
/*
* Expect allocation after rollover to fail if we don't have at least
- * one more ASID than CPUs. ASID #0 is reserved for init_mm.
+ * one more ASID than CPUs. ASID #0 is always reserved.
*/
WARN_ON(NUM_CTXT_ASIDS(info) - 1 <= num_possible_cpus());
atomic64_set(&info->generation, ASID_FIRST_VERSION(info));
info->map = kcalloc(BITS_TO_LONGS(NUM_CTXT_ASIDS(info)),
sizeof(*info->map), GFP_KERNEL);
if (!info->map)
- panic("Failed to allocate bitmap for %lu ASIDs\n",
- NUM_CTXT_ASIDS(info));
-
- info->active = &active_asids;
- info->reserved = &reserved_asids;
+ return -ENOMEM;
raw_spin_lock_init(&info->lock);
+ return 0;
+}
+
+static int asids_init(void)
+{
+ u32 bits = get_cpu_asid_bits();
+
+ if (!asid_allocator_init(&asid_info, bits, ASID_PER_CONTEXT))
+ panic("Unable to initialize ASID allocator for %lu ASIDs\n",
+ 1UL << bits);
+
+ asid_info.active = &active_asids;
+ asid_info.reserved = &reserved_asids;
+
pr_info("ASID allocator initialised with %lu entries\n",
- NUM_CTXT_ASIDS(info));
+ NUM_CTXT_ASIDS(&asid_info));
+
return 0;
}
early_initcall(asids_init);
--
2.11.0
next prev parent reply other threads:[~2019-06-20 13:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 13:05 [RFC v2 00/14] kvm/arm: Align the VMID allocation with the arm64 ASID one Julien Grall
2019-06-20 13:05 ` [RFC v2 01/14] arm64/mm: Introduce asid_info structure and move asid_generation/asid_map to it Julien Grall
2019-06-20 13:05 ` [RFC v2 02/14] arm64/mm: Move active_asids and reserved_asids to asid_info Julien Grall
2019-06-20 13:05 ` [RFC v2 03/14] arm64/mm: Move bits " Julien Grall
2019-06-20 13:05 ` [RFC v2 04/14] arm64/mm: Move the variable lock and tlb_flush_pending " Julien Grall
2019-06-20 13:05 ` [RFC v2 05/14] arm64/mm: Remove dependency on MM in new_context Julien Grall
2019-06-20 13:06 ` [RFC v2 06/14] arm64/mm: Store the number of asid allocated per context Julien Grall
2019-06-20 13:06 ` [RFC v2 07/14] arm64/mm: Introduce NUM_ASIDS Julien Grall
2019-06-20 13:06 ` Julien Grall [this message]
2019-06-20 13:06 ` [RFC v2 09/14] arm64/mm: Split the function check_and_switch_context in 3 parts Julien Grall
2019-06-20 13:06 ` [RFC v2 10/14] arm64/mm: Introduce a callback to flush the local context Julien Grall
2019-06-20 13:06 ` [RFC v2 11/14] arm64: Move the ASID allocator code in a separate file Julien Grall
2019-07-04 14:56 ` James Morse
2019-07-15 10:58 ` Julien Grall
2019-06-20 13:06 ` [RFC v2 12/14] arm64/lib: asid: Allow user to update the context under the lock Julien Grall
2019-07-03 17:35 ` James Morse
2019-07-15 14:38 ` Julien Grall
2019-06-20 13:06 ` [RFC v2 13/14] arm/kvm: Introduce a new VMID allocator Julien Grall
2019-06-20 13:06 ` [RFC v2 14/14] kvm/arm: Align the VMID allocation with the arm64 ASID one Julien Grall
2019-07-03 17:36 ` James Morse
2019-07-15 17:06 ` Julien Grall
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