From: Vikash Garodia <vgarodia@codeaurora.org>
To: Alexandre Courbot <acourbot@chromium.org>
Cc: Stanimir Varbanov <stanimir.varbanov@linaro.org>,
Hans Verkuil <hverkuil@xs4all.nl>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
robh@kernel.org, mark.rutland@arm.com,
Andy Gross <andy.gross@linaro.org>, Arnd Bergmann <arnd@arndb.de>,
bjorn.andersson@linaro.org,
Linux Media Mailing List <linux-media@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
devicetree@vger.kernel.org, linux-media-owner@vger.kernel.org
Subject: Re: [PATCH v6 3/4] venus: firmware: add no TZ boot and shutdown routine
Date: Mon, 27 Aug 2018 18:19:29 +0530 [thread overview]
Message-ID: <002138192bcb3f7e6bf55e090d1b5328@codeaurora.org> (raw)
In-Reply-To: <CAPBb6MX7EQvXfq_F+8b2FcqROpGY7ud4M6UyttGzoELsw=NJ=Q@mail.gmail.com>
On 2018-08-27 08:36, Alexandre Courbot wrote:
> On Fri, Aug 24, 2018 at 9:26 PM Vikash Garodia
> <vgarodia@codeaurora.org> wrote:
>>
>> Hi Alex,
>>
>> On 2018-08-24 13:09, Alexandre Courbot wrote:
>> > On Thu, Aug 23, 2018 at 11:29 PM Vikash Garodia
>> > <vgarodia@codeaurora.org> wrote:
>>
>> [snip]
>>
>> >> +struct video_firmware {
>> >> + struct device *dev;
>> >> + struct iommu_domain *iommu_domain;
>> >> +};
>> >> +
>> >> /**
>> >> * struct venus_core - holds core parameters valid for all instances
>> >> *
>> >> @@ -98,6 +103,7 @@ struct venus_caps {
>> >> * @dev: convenience struct device pointer
>> >> * @dev_dec: convenience struct device pointer for decoder device
>> >> * @dev_enc: convenience struct device pointer for encoder device
>> >> + * @fw: a struct for venus firmware info
>> >> * @no_tz: a flag that suggests presence of trustzone
>> >> * @lock: a lock for this strucure
>> >> * @instances: a list_head of all instances
>> >> @@ -130,6 +136,7 @@ struct venus_core {
>> >> struct device *dev;
>> >> struct device *dev_dec;
>> >> struct device *dev_enc;
>> >> + struct video_firmware fw;
>> >
>> > Since struct video_firmware is only used here I think you can declare
>> > it inline, i.e.
>> >
>> > struct {
>> > struct device *dev;
>> > struct iommu_domain *iommu_domain;
>> > } fw;
>> >
>> > This structure is actually a good candidate to hold the firmware
>> > memory area start address and size.
>>
>> I can make it inline.
>> Memory area and size are common parameters populated
>> locally while loading the firmware with or without tz. Firmware struct
>> has
>> info more specific to firmware device.
>>
>> [snip]
>>
>> >
>> >> +{
>> >> + struct iommu_domain *iommu_dom;
>> >> + struct device *dev;
>> >> + int ret;
>> >> +
>> >> + dev = core->fw.dev;
>> >> + if (!dev)
>> >> + return -EPROBE_DEFER;
>> >> +
>> >> + iommu_dom = iommu_domain_alloc(&platform_bus_type);
>> >> + if (!iommu_dom) {
>> >> + dev_err(dev, "Failed to allocate iommu domain\n");
>> >> + return -ENOMEM;
>> >> + }
>> >> +
>> >> + ret = iommu_attach_device(iommu_dom, dev);
>> >> + if (ret) {
>> >> + dev_err(dev, "could not attach device\n");
>> >> + goto err_attach;
>> >> + }
>> >
>> > I think like the above belongs more in venus_firmware_init()
>> > (introduced in patch 4/4) than here. There is no reason to
>> > detach/reattach the iommu if we stop the firmware.
>>
>> Consider the case when we want to reload the firmware during error
>> recovery.
>> Boot and shutdown will be needed in such case without the need to
>> populate
>> the firmware device again.
>
> Is there a need to reattach the iommu domain in case of an error?
re-attach is not needed. We can have alloc/attach in init and
detach/free in deinit.
map/reset and unmap/reset can continue to remain in boot and shutdown
calls. Let me
know if this is good, i can repatch the series.
next prev parent reply other threads:[~2018-08-27 12:49 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-23 14:28 [PATCH v6 0/4] Venus updates - PIL Vikash Garodia
2018-08-23 14:28 ` [PATCH v6 1/4] venus: firmware: add routine to reset ARM9 Vikash Garodia
2018-08-24 7:38 ` Alexandre Courbot
2018-08-24 8:57 ` Stanimir Varbanov
2018-08-24 12:35 ` Vikash Garodia
2018-08-27 3:04 ` Alexandre Courbot
2018-08-27 10:56 ` Stanimir Varbanov
2018-08-28 5:43 ` Alexandre Courbot
2018-08-23 14:28 ` [PATCH v6 2/4] venus: firmware: move load firmware in a separate function Vikash Garodia
2018-08-24 7:39 ` Alexandre Courbot
2018-08-24 9:01 ` Stanimir Varbanov
2018-08-27 3:10 ` Alexandre Courbot
2018-08-23 14:28 ` [PATCH v6 3/4] venus: firmware: add no TZ boot and shutdown routine Vikash Garodia
2018-08-24 7:39 ` Alexandre Courbot
2018-08-24 12:26 ` Vikash Garodia
2018-08-27 3:06 ` Alexandre Courbot
2018-08-27 12:49 ` Vikash Garodia [this message]
2018-08-28 5:45 ` Alexandre Courbot
2018-08-23 14:28 ` [PATCH v6 4/4] venus: firmware: register separate platform_device for firmware loader Vikash Garodia
2018-08-24 6:45 ` Stephen Boyd
2018-08-24 7:39 ` Alexandre Courbot
2018-08-28 22:15 ` Rob Herring
2018-08-30 3:53 ` kbuild test robot
2018-08-24 7:39 ` [PATCH v6 0/4] Venus updates - PIL Alexandre Courbot
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