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 09:16:59 -0500 [thread overview]
Message-ID: <57694C5B.8040308@codeaurora.org> (raw)
In-Reply-To: <57694634.2040103@arm.com>
On 06/21/2016 08:50 AM, Julien Grall wrote:
>
>
> On 21/06/16 14:37, Shanker Donthineni wrote:
>> On 06/21/2016 04:28 AM, Julien Grall wrote:
>>> 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.
>
> This should be a prerequisite of this series then, not a follow-up.
>
For the functionality and correctness purpose we don't need this change
immediately.
We are not able to boot XEN on Qualcomm Technologies because of not
supporting
GICC table parsing for GICR address.
I am okay to wait for my patchset if someone adding bseach look ups for
mmio handlers.
> 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 14:16 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
2016-06-21 13:50 ` Julien Grall
2016-06-21 14:16 ` Shanker Donthineni [this message]
2016-06-21 14:44 ` Julien Grall
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