Re: [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver

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From: Christoffer Dall <christoffer.dall@linaro.org>
To: Sinan Kaya <okaya@codeaurora.org>
Cc: dmaengine@vger.kernel.org, marc.zyngier@arm.com,
	mark.rutland@arm.com, timur@codeaurora.org,
	devicetree@vger.kernel.org, cov@codeaurora.org,
	vinod.koul@intel.com, jcm@redhat.com, vikrams@codeaurora.org,
	arnd@arndb.de, eric.auger@linaro.org,
	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, agross@codeaurora.org,
	shankerd@codeaurora.org
Subject: Re: [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver
Date: Mon, 8 Feb 2016 11:14:32 +0100	[thread overview]
Message-ID: <20160208101432.GA1150@cbox> (raw)
In-Reply-To: <1454646882-24369-1-git-send-email-okaya@codeaurora.org>

Hi Sinan,

On Thu, Feb 04, 2016 at 11:34:31PM -0500, Sinan Kaya wrote:
> The Qualcomm Technologies HIDMA device has been designed
> to support virtualization technology. The driver has been
> divided into two to follow the hardware design.
> 
> 1. HIDMA Management driver
> 2. HIDMA Channel driver
> 
> Each HIDMA HW consists of multiple channels. These channels
> share some set of common parameters. These parameters are
> initialized by the management driver during power up.
> Same management driver is used for monitoring the execution
> of the channels. Management driver can change the performance
> behavior dynamically such as bandwidth allocation and
> prioritization in the future.
> 
> The management driver is executed in host context and
> is the main management entity for all channels provided by
> the device.

I'm not at all familiar with this kind of hardware.

Once an entity (userspace or VM) has a HIDAM channel assigned via VFIO,
how does it use it?  Is it used in relation with another device to
perform DMA on its behalf or is a HIDMA channel something that's useful
on its own?

Thanks,
-Christoffer

WARNING: multiple messages have this Message-ID (diff)

From: christoffer.dall@linaro.org (Christoffer Dall)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver
Date: Mon, 8 Feb 2016 11:14:32 +0100	[thread overview]
Message-ID: <20160208101432.GA1150@cbox> (raw)
In-Reply-To: <1454646882-24369-1-git-send-email-okaya@codeaurora.org>

Hi Sinan,

On Thu, Feb 04, 2016 at 11:34:31PM -0500, Sinan Kaya wrote:
> The Qualcomm Technologies HIDMA device has been designed
> to support virtualization technology. The driver has been
> divided into two to follow the hardware design.
> 
> 1. HIDMA Management driver
> 2. HIDMA Channel driver
> 
> Each HIDMA HW consists of multiple channels. These channels
> share some set of common parameters. These parameters are
> initialized by the management driver during power up.
> Same management driver is used for monitoring the execution
> of the channels. Management driver can change the performance
> behavior dynamically such as bandwidth allocation and
> prioritization in the future.
> 
> The management driver is executed in host context and
> is the main management entity for all channels provided by
> the device.

I'm not at all familiar with this kind of hardware.

Once an entity (userspace or VM) has a HIDAM channel assigned via VFIO,
how does it use it?  Is it used in relation with another device to
perform DMA on its behalf or is a HIDMA channel something that's useful
on its own?

Thanks,
-Christoffer

next prev parent reply	other threads:[~2016-02-08 10:14 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-05  4:34 [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver Sinan Kaya
2016-02-05  4:34 ` Sinan Kaya
2016-02-05  4:34 ` [PATCH V14 1/9] dma: qcom_bam_dma: move to qcom directory Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-03-11  2:13   ` Vinod Koul
2016-03-11  2:13     ` Vinod Koul
2016-02-05  4:34 ` [PATCH V14 2/9] dma: hidma: Add Device Tree binding Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-03-11  2:16   ` Vinod Koul
2016-03-11  2:16     ` Vinod Koul
2016-02-05  4:34 ` [PATCH V14 3/9] dma: add Qualcomm Technologies HIDMA management driver Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-03-11  2:16   ` Vinod Koul
2016-03-11  2:16     ` Vinod Koul
2016-02-05  4:34 ` [PATCH V14 4/9] dma: add Qualcomm Technologies HIDMA channel driver Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
     [not found]   ` <1454646882-24369-5-git-send-email-okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-11  2:17     ` Vinod Koul
2016-03-11  2:17       ` Vinod Koul
2016-03-11  2:17       ` Vinod Koul
2016-02-05  4:34 ` [PATCH V14 5/9] dma: qcom_hidma: implement lower level hardware interface Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-03-11  2:06   ` Vinod Koul
2016-03-11  2:06     ` Vinod Koul
2016-03-11  3:08     ` Okaya-sgV2jX0FEOL9JmXXK+q4OQ
2016-03-11  3:08       ` Okaya
2016-03-11  3:08       ` Okaya at codeaurora.org
2016-03-11 16:02     ` Sinan Kaya
2016-03-11 16:02       ` Sinan Kaya
     [not found]       ` <56E2EC1C.6040107-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-11 16:32         ` Vinod Koul
2016-03-11 16:32           ` Vinod Koul
2016-03-11 16:32           ` Vinod Koul
2016-03-11 16:44           ` Sinan Kaya
2016-03-11 16:44             ` Sinan Kaya
2016-03-11 19:29             ` Sinan Kaya
2016-03-11 19:29               ` Sinan Kaya
2016-03-11 21:59               ` Sinan Kaya
2016-03-11 21:59                 ` Sinan Kaya
2016-03-13 16:00                 ` Vinod Koul
2016-03-13 16:00                   ` Vinod Koul
2016-03-14 13:53                   ` Sinan Kaya
2016-03-14 13:53                     ` Sinan Kaya
2016-03-13 15:59               ` Vinod Koul
2016-03-13 15:59                 ` Vinod Koul
2016-03-14 13:56                 ` Sinan Kaya
2016-03-14 13:56                   ` Sinan Kaya
2016-02-05  4:34 ` [PATCH V14 6/9] dma: qcom_hidma: add debugfs hooks Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-02-05  4:34 ` [PATCH V14 7/9] dma: qcom_hidma: add support for object hierarchy Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-02-05  4:34 ` [PATCH V14 8/9] vfio, platform: add support for ACPI while detecting the reset driver Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
     [not found]   ` <1454646882-24369-9-git-send-email-okaya-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-02-26 16:24     ` Sinan Kaya
2016-02-26 16:24       ` Sinan Kaya
2016-02-26 16:24       ` Sinan Kaya
2016-02-26 17:15     ` Eric Auger
2016-02-26 17:15       ` Eric Auger
2016-02-26 17:15       ` Eric Auger
2016-02-26 19:21       ` Sinan Kaya
2016-02-26 19:21         ` Sinan Kaya
2016-03-02 18:34       ` Sinan Kaya
2016-03-02 18:34         ` Sinan Kaya
2016-03-03 23:14         ` Eric Auger
2016-03-03 23:14           ` Eric Auger
2016-03-04  5:20           ` Sinan Kaya
2016-03-04  5:20             ` Sinan Kaya
2016-03-07  4:09             ` Eric Auger
2016-03-07  4:09               ` Eric Auger
     [not found]               ` <56DCFEE0.6080101-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2016-03-07 15:30                 ` Sinan Kaya
2016-03-07 15:30                   ` Sinan Kaya
2016-03-07 15:30                   ` Sinan Kaya
2016-03-08  4:46                   ` Eric Auger
2016-03-08  4:46                     ` Eric Auger
2016-03-08  5:07                     ` Sinan Kaya
2016-03-08  5:07                       ` Sinan Kaya
2016-03-08 15:44                       ` Sinan Kaya
2016-03-08 15:44                         ` Sinan Kaya
2016-02-05  4:34 ` [PATCH V14 9/9] vfio, platform: add QTI HIDMA " Sinan Kaya
2016-02-05  4:34   ` Sinan Kaya
2016-02-26 17:52   ` Eric Auger
2016-02-26 17:52     ` Eric Auger
2016-02-26 19:05     ` Sinan Kaya
2016-02-26 19:05       ` Sinan Kaya
2016-02-08 10:14 ` Christoffer Dall [this message]
2016-02-08 10:14   ` [PATCH V14 0/9] dma: add Qualcomm Technologies HIDMA driver Christoffer Dall
2016-02-08 14:24   ` Sinan Kaya
2016-02-08 14:24     ` Sinan Kaya
2016-02-08 17:00     ` Christoffer Dall
2016-02-08 17:00       ` Christoffer Dall
2016-02-26 16:21 ` Sinan Kaya
2016-02-26 16:21   ` Sinan Kaya
2016-02-26 16:52   ` Timur Tabi
2016-02-26 16:52     ` Timur Tabi
2016-03-02 18:40     ` Sinan Kaya
2016-03-02 18:40       ` Sinan Kaya
     [not found]       ` <56D733BA.6030203-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2016-03-03  3:44         ` Vinod Koul
2016-03-03  3:44           ` Vinod Koul
2016-03-03  3:44           ` Vinod Koul
2016-03-03 15:22           ` Sinan Kaya
2016-03-03 15:22             ` Sinan Kaya

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