From: Shanker Donthineni <shankerd@codeaurora.org>
To: Julien Grall <julien.grall@arm.com>,
xen-devel <xen-devel@lists.xensource.com>,
Stefano Stabellini <sstabellini@kernel.org>
Cc: Philip Elcan <pelcan@codeaurora.org>,
Vikram Sethi <vikrams@codeaurora.org>
Subject: Re: [PATCH 0/8] Add support for parsing per CPU Redistributor entry
Date: Tue, 21 Jun 2016 08:37:12 -0500 [thread overview]
Message-ID: <57694308.7030002@codeaurora.org> (raw)
In-Reply-To: <576908AF.6080800@arm.com>
On 06/21/2016 04:28 AM, Julien Grall wrote:
> Hello Shanker,
>
> On 19/06/16 00:45, Shanker Donthineni wrote:
>> The current driver doesn't support parsing Redistributor entries that
>> are described in the MADT GICC table. Not all the GIC implementors
>> places the Redistributor regions in the always-on power domain. On
>> systems, the UEFI firmware should describe Redistributor base address
>> in the associated GIC CPU Interface (GICC) instead of GIC Redistributor
>> (GICR) table.
>>
>> The maximum number of mmio handlers and struct vgic_rdist_region
>> that holds Redistributor addresses are allocated through a static
>> array with hardcoded size. I don't think this is the right approach
>> and is not scalable for implementing features like this. I have
>> decided to convert static to dynamic allocation based on comments
>> from the below link.
>>
>> https://patchwork.kernel.org/patch/9163435/
>
> You addressed only one part of my comment. This series increases the
> number of I/O handlers but the lookup is still linear (see handle_mmio
> in arch/arm/io.c).
>
I agree with you, we need to bring binary search algorithm similar to
Linux KVM code. I want to keep it this change outside of this patchset.
> After this series, the maximum number of I/O handlers is 160. So in
> the worst case, we have to do 160 iterations before finding an handler
> or concluding the I/O cannot be emulated.
>
> Regards,
>
--
Shanker Donthineni
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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next prev parent reply other threads:[~2016-06-21 13:37 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-18 23:45 [PATCH 0/8] Add support for parsing per CPU Redistributor entry Shanker Donthineni
2016-06-18 23:45 ` [PATCH 1/8] arm/gic-v3: Add a separate function for mapping GICD region Shanker Donthineni
2016-06-21 9:42 ` Julien Grall
2016-06-18 23:45 ` [PATCH 2/8] arm/gic-v3: Fold GICR subtable parsing into a new function Shanker Donthineni
2016-06-21 10:17 ` Julien Grall
2016-06-21 14:02 ` Shanker Donthineni
2016-06-18 23:45 ` [PATCH 3/8] arm/gic-v3: Parse per-cpu redistributor entry in GICC subtable Shanker Donthineni
2016-06-21 10:16 ` Julien Grall
2016-06-21 13:52 ` Shanker Donthineni
2016-06-22 13:06 ` Julien Grall
2016-06-18 23:45 ` [PATCH 4/8] xen/arm: vgic: Use dynamic memory allocation for vgic_rdist_region Shanker Donthineni
2016-06-21 10:26 ` Julien Grall
2016-06-18 23:45 ` [PATCH 5/8] arm/gic-v3: Remove an unused macro MAX_RDIST_COUNT Shanker Donthineni
2016-06-18 23:45 ` [PATCH 6/8] arm: vgic: Split vgic_domain_init() functionality into two functions Shanker Donthineni
2016-06-21 10:49 ` Julien Grall
2016-06-21 14:36 ` Shanker Donthineni
2016-06-21 14:48 ` Julien Grall
2016-06-21 15:09 ` Shanker Donthineni
2016-06-18 23:45 ` [PATCH 7/8] arm/mmio: Use separate memory allocation for mmio handlers Shanker Donthineni
2016-06-18 23:45 ` [PATCH 8/8] arm/vgic: Change fixed number of mmio handlers to variable number Shanker Donthineni
2016-06-21 9:28 ` [PATCH 0/8] Add support for parsing per CPU Redistributor entry Julien Grall
2016-06-21 13:37 ` Shanker Donthineni [this message]
2016-06-21 13:50 ` Julien Grall
2016-06-21 14:16 ` Shanker Donthineni
2016-06-21 14:44 ` Julien Grall
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