From: Robin Murphy <robin.murphy@arm.com>
To: Yong Wu <yong.wu@mediatek.com>, Will Deacon <will@kernel.org>
Cc: youlin.pei@mediatek.com, devicetree@vger.kernel.org,
Nicolas Boichat <drinkcat@chromium.org>,
cui.zhang@mediatek.com, srv_heupstream@mediatek.com,
Tomasz Figa <tfiga@google.com>,
linux-kernel@vger.kernel.org, Evan Green <evgreen@chromium.org>,
chao.hao@mediatek.com, iommu@lists.linux-foundation.org,
Rob Herring <robh+dt@kernel.org>,
linux-mediatek@lists.infradead.org,
Matthias Brugger <matthias.bgg@gmail.com>,
ming-fan.chen@mediatek.com, anan.sun@mediatek.com,
Matthias Kaehlcke <mka@chromium.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v10 09/23] iommu/io-pgtable-arm-v7s: Extend to support PA[33:32] for MediaTek
Date: Thu, 22 Aug 2019 11:08:58 +0100 [thread overview]
Message-ID: <10d5122d-3375-161b-9356-2ddfc1c835bd@arm.com> (raw)
In-Reply-To: <1566464186.11621.7.camel@mhfsdcap03>
On 2019-08-22 9:56 am, Yong Wu wrote:
> On Wed, 2019-08-21 at 16:24 +0100, Will Deacon wrote:
>> On Wed, Aug 21, 2019 at 09:53:12PM +0800, Yong Wu wrote:
>>> MediaTek extend the arm v7s descriptor to support up to 34 bits PA where
>>> the bit32 and bit33 are encoded in the bit9 and bit4 of the PTE
>>> respectively. Meanwhile the iova still is 32bits.
>>>
>>> Regarding whether the pagetable address could be over 4GB, the mt8183
>>> support it while the previous mt8173 don't, thus keep it as is.
>>>
>>> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
>>> ---
>>> drivers/iommu/io-pgtable-arm-v7s.c | 32 +++++++++++++++++++++++++-------
>>> include/linux/io-pgtable.h | 7 +++----
>>> 2 files changed, 28 insertions(+), 11 deletions(-)
>>
>> [...]
>>
>>> @@ -731,7 +747,9 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
>>> {
>>> struct arm_v7s_io_pgtable *data;
>>>
>>> - if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS)
>>> + if (cfg->ias > ARM_V7S_ADDR_BITS ||
>>> + (cfg->oas > ARM_V7S_ADDR_BITS &&
>>> + !(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT)))
>>
>> Please can you instead change arm_v7s_alloc_pgtable() so that it allows an
>> ias of up to 34 when the IO_PGTABLE_QUIRK_ARM_MTK_EXT is set?
>
> Here I only simply skip the oas checking for our case. then which way do
> your prefer? something like you commented before:?
>
>
> if (cfg->ias > ARM_V7S_ADDR_BITS)
> return NULL;
>
> if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT) {
> if (!IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT))
> cfg->oas = min(cfg->oas, ARM_V7S_ADDR_BITS);
> else if (cfg->oas > 34)
> return NULL;
> } else if (cfg->oas > ARM_V7S_ADDR_BITS) {
> return NULL;
> }
All it should take is something like:
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT)
max_oas = 34;
else
max_oas = 32;
if (cfg->oas > max_oas)
return NULL;
or even just:
if (cfg->oas > 32 ||
(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT && cfg->oas > 34))
return NULL;
(and if we prefer the latter style, perhaps we could introduce some kind
of "is_mtk_4gb()" helper to save on verbosity)
We shouldn't need to care about the size of phys_addr_t either way - the
fact is that the MTK format can still encode up to 34 bits of PA
regardless of whether callers can actually pass addresses that large.
Robin.
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next prev parent reply other threads:[~2019-08-22 10:09 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 13:53 [PATCH v10 00/23] MT8183 IOMMU SUPPORT Yong Wu
2019-08-21 13:53 ` [PATCH v10 01/23] dt-bindings: mediatek: Add binding for mt8183 IOMMU and SMI Yong Wu
2019-08-21 13:53 ` [PATCH v10 02/23] iommu/mediatek: Use a struct as the platform data Yong Wu
2019-08-21 13:53 ` [PATCH v10 03/23] memory: mtk-smi: Use a general config_port interface Yong Wu
2019-08-21 13:53 ` [PATCH v10 04/23] memory: mtk-smi: Use a struct for the platform data for smi-common Yong Wu
2019-08-21 13:53 ` [PATCH v10 05/23] iommu/mediatek: Fix iova_to_phys PA start for 4GB mode Yong Wu
2019-08-21 13:53 ` [PATCH v10 06/23] iommu/io-pgtable-arm-v7s: Add paddr_to_iopte and iopte_to_paddr helpers Yong Wu
2019-08-21 13:53 ` [PATCH v10 07/23] iommu/io-pgtable-arm-v7s: Use ias/oas to check the valid iova/pa Yong Wu
2019-08-21 15:25 ` Will Deacon
2019-08-21 13:53 ` [PATCH v10 08/23] iommu/io-pgtable-arm-v7s: Rename the quirk from MTK_4GB to MTK_EXT Yong Wu
2019-08-21 15:25 ` Will Deacon
2019-08-21 13:53 ` [PATCH v10 09/23] iommu/io-pgtable-arm-v7s: Extend to support PA[33:32] for MediaTek Yong Wu
2019-08-21 15:24 ` Will Deacon
2019-08-21 15:34 ` Robin Murphy
2019-08-21 16:35 ` Will Deacon
2019-08-22 8:59 ` Yong Wu
2019-08-22 8:56 ` Yong Wu
2019-08-22 10:08 ` Will Deacon
2019-08-22 10:08 ` Robin Murphy [this message]
2019-08-22 10:17 ` Will Deacon
2019-08-22 10:57 ` Robin Murphy
2019-08-22 11:28 ` Will Deacon
2019-08-22 12:05 ` Yong Wu
2019-08-22 17:14 ` Will Deacon
2019-08-21 13:53 ` [PATCH v10 10/23] iommu/mediatek: Adjust the PA for the 4GB Mode Yong Wu
2019-08-21 13:53 ` [PATCH v10 11/23] iommu/mediatek: Add bclk can be supported optionally Yong Wu
2019-08-21 13:53 ` [PATCH v10 12/23] iommu/mediatek: Add larb-id remapped support Yong Wu
2019-08-21 13:53 ` [PATCH v10 13/23] iommu/mediatek: Refine protect memory definition Yong Wu
2019-08-21 13:53 ` [PATCH v10 14/23] iommu/mediatek: Move reset_axi into plat_data Yong Wu
2019-08-21 13:53 ` [PATCH v10 15/23] iommu/mediatek: Move vld_pa_rng " Yong Wu
2019-08-21 13:53 ` [PATCH v10 16/23] memory: mtk-smi: Add gals support Yong Wu
2019-08-21 13:53 ` [PATCH v10 17/23] iommu/mediatek: Add mt8183 IOMMU support Yong Wu
2019-08-21 13:53 ` [PATCH v10 18/23] iommu/mediatek: Add mmu1 support Yong Wu
2019-08-21 13:53 ` [PATCH v10 19/23] memory: mtk-smi: Invoke pm runtime_callback to enable clocks Yong Wu
2019-08-21 13:53 ` [PATCH v10 20/23] memory: mtk-smi: Add bus_sel for mt8183 Yong Wu
2019-08-21 13:53 ` [PATCH v10 21/23] iommu/mediatek: Fix VLD_PA_RNG register backup when suspend Yong Wu
2019-08-21 13:53 ` [PATCH v10 22/23] memory: mtk-smi: Get rid of need_larbid Yong Wu
2019-08-21 13:53 ` [PATCH v10 23/23] iommu/mediatek: Clean up struct mtk_smi_iommu Yong Wu
2019-08-22 14:07 ` Matthias Brugger
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