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From: Phil Elwell <phil@raspberrypi.com>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	linux-media@vger.kernel.org
Cc: "Kieran Bingham" <kieran.bingham@ideasonboard.com>,
	"Jacopo Mondi" <jacopo@jmondi.org>,
	"Niklas Söderlund" <niklas.soderlund@ragnatech.se>,
	"Naushir Patuck" <naush@raspberrypi.com>,
	"Dave Stevenson" <dave.stevenson@raspberrypi.com>,
	"Phil Elwell" <phil@raspberrypi.org>
Subject: Re: [PATCH v2 29/34] staging: vchiq: Add 36-bit address support
Date: Mon, 4 May 2020 21:46:01 +0100	[thread overview]
Message-ID: <7cbd4185-0d26-aa26-3f7a-56b5b13e5336@raspberrypi.com> (raw)
In-Reply-To: <00cc89e24aa5c3d4286b6f42347aa87e7699c4e5.camel@suse.de>

Hi Nicolas,

On 04/05/2020 18:40, Nicolas Saenz Julienne wrote:
> Hi Phil, Laurent,
>
> On Mon, 2020-05-04 at 12:26 +0300, Laurent Pinchart wrote:
>> From: Phil Elwell <phil@raspberrypi.org>
>>
>> Conditional on a new compatible string, change the pagelist encoding
>> such that the top 24 bits are the pfn, leaving 8 bits for run length
>> (-1).
>>
>> Signed-off-by: Phil Elwell <phil@raspberrypi.org>
>> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
>> ---
>>   .../interface/vchiq_arm/vchiq_2835_arm.c      | 88 ++++++++++++++-----
>>   .../interface/vchiq_arm/vchiq_arm.c           |  6 ++
>>   .../interface/vchiq_arm/vchiq_arm.h           |  1 +
>>   3 files changed, 74 insertions(+), 21 deletions(-)
>>
>> diff --git
>> a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
>> b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
>> index 3e422a7eb3f1..ecec84ad4345 100644
>> --- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
>> +++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
>> @@ -16,6 +16,8 @@
>>   #include <soc/bcm2835/raspberrypi-firmware.h>
>>     #define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32)
>> +#define VC_SAFE(x) (g_use_36bit_addrs ? ((u32)(x) | 0xc0000000) : (u32)(x))
>> +#define IS_VC_SAFE(x) (g_use_36bit_addrs ? !((x) & ~0x3fffffffull) : 1)
>
> As I commented earlier, this is a sign your dma-ranges are wrong, most of the
> code below reimplements what is already done by dma-direct (see
> kernel/dma/direct.c). Once properly setup, you should be able to use whatever
> phys address dmam_alloc_coherent() provides and drop g_use_36bit_addrs.
>
> Note that on arm32+LPAE, dma-direct/swiotlb are the default dma_ops, so this
> also applies there.

As I explained in an offline email, the problem is that VCHIQ needs access to two
kinds of "DMA" addresses - those suitable for the 40-bit DMA channel, and the
30-bit addresses that the VPU can use. Since each DT node only has access to a
single set of DMA ranges, I can't see how to use dma-direct to calculate addreses
for everything, but feel free to submit an alternative implementation showing how
it should be done.

Phil


  reply	other threads:[~2020-05-04 20:46 UTC|newest]

Thread overview: 104+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-04  9:25 [PATCH v2 00/34] Drivers for the BCM283x CSI-2/CCP2 receiver and ISP Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 01/34] media: uapi: v4l2-core: Add sensor ancillary data V4L2 fourcc type Laurent Pinchart
2020-05-04 13:48   ` Hans Verkuil
2020-05-04 14:39     ` Dave Stevenson
2020-05-04 15:32       ` Hans Verkuil
2020-05-04 16:08         ` Laurent Pinchart
2020-05-05 11:20           ` Dave Stevenson
2020-05-04  9:25 ` [PATCH v2 02/34] media: uapi: Add MEDIA_BUS_FMT_SENSOR_DATA media bus format Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 03/34] dt-bindings: media: Document BCM283x CSI2/CCP2 receiver Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 04/34] media: bcm2835-unicam: Driver for CCP2/CSI2 camera interface Laurent Pinchart
2020-05-04 15:21   ` Hans Verkuil
2020-05-05  1:26   ` kbuild test robot
2020-05-06 18:01   ` Nicolas Saenz Julienne
2020-08-29 11:20   ` Jacopo Mondi
2020-08-29 18:32     ` Laurent Pinchart
2020-08-31  7:38       ` Jacopo Mondi
2020-08-31 14:17         ` Laurent Pinchart
2020-08-31 14:46           ` Jacopo Mondi
2020-08-31 14:56             ` Laurent Pinchart
2020-09-01  8:41               ` Dave Stevenson
2020-09-01 10:22                 ` Jacopo Mondi
2020-09-01 16:37                   ` Dave Stevenson
2020-09-01 17:11                     ` Laurent Pinchart
2020-09-15  7:03   ` Sakari Ailus
2020-09-15  9:32     ` Laurent Pinchart
2020-09-15 13:28       ` Dave Stevenson
2020-10-30 17:53         ` Jacopo Mondi
2020-09-15 17:30     ` Dave Stevenson
2020-05-04  9:25 ` [PATCH v2 05/34] ARM: dts: bcm2711: Add Unicam DT nodes Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 06/34] staging: vc04_services: Add new vc-sm-cma driver Laurent Pinchart
2020-05-05  2:38   ` kbuild test robot
2020-05-05 12:17   ` kbuild test robot
2020-05-06  3:05   ` kbuild test robot
2020-05-06 18:04   ` Nicolas Saenz Julienne
2020-05-06 19:24     ` Dave Stevenson
2020-05-08  0:11       ` Laurent Pinchart
2020-05-18 12:06         ` Hans Verkuil
2020-08-24 16:39       ` Jacopo Mondi
2020-08-25 17:52         ` Dave Stevenson
2020-08-27 10:38           ` Jacopo Mondi
2020-08-27 12:51             ` Dave Stevenson
2020-08-27 16:46               ` Jacopo Mondi
2020-08-27 17:19                 ` Dave Stevenson
2020-05-11 18:42   ` Nicolas Saenz Julienne
2020-05-18 15:48     ` Dave Stevenson
2020-05-20 14:41       ` Nicolas Saenz Julienne
2020-05-21 11:01         ` Dave Stevenson
2020-05-04  9:25 ` [PATCH v2 07/34] staging: bcm2835: Break MMAL support out from camera Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 08/34] staging: mmal-vchiq: Allocate and free components as required Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 09/34] staging: mmal-vchiq: Avoid use of bool in structures Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 10/34] staging: mmal-vchiq: Make timeout a defined parameter Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 11/34] staging: mmal-vchiq: Make a mmal_buf struct for passing parameters Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 12/34] staging: mmal-vchiq: Add support for event callbacks Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 13/34] staging: mmal-vchiq: Support sending data to MMAL ports Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 14/34] staging: mmal-vchiq: Fixup vchiq-mmal include ordering Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 15/34] staging: mmal-vchiq: Use vc-sm-cma to support zero copy Laurent Pinchart
2020-05-04 16:30   ` Nicolas Saenz Julienne
2020-05-05 16:07   ` kbuild test robot
2020-05-11 19:15   ` Nicolas Saenz Julienne
2020-05-04  9:25 ` [PATCH v2 16/34] staging: mmal-vchiq: Fix client_component for 64 bit kernel Laurent Pinchart
2020-05-18 10:19   ` Hans Verkuil
2020-05-04  9:25 ` [PATCH v2 17/34] staging: mmal_vchiq: Add in the Bayer encoding formats Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 18/34] staging: mmal-vchiq: Always return the param size from param_get Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 19/34] staging: mmal-vchiq: If the VPU returns an error, don't negate it Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 20/34] staging: mmal-vchiq: Fix handling of VB2_MEMORY_DMABUF buffers Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 21/34] staging: mmal-vchiq: Update mmal_parameters.h with recently defined params Laurent Pinchart
2020-05-04  9:25 ` [PATCH v2 22/34] staging: mmal-vchiq: Free the event context for control ports Laurent Pinchart
2020-05-04  9:26 ` [PATCH v2 23/34] staging: mmal-vchiq: Fix memory leak in error path Laurent Pinchart
2020-05-04  9:26 ` [PATCH v2 24/34] staging: mmal-vchiq: Fix formatting errors in mmal_parameters.h Laurent Pinchart
2020-05-04  9:26 ` [PATCH v2 25/34] staging: vchiq_arm: Register vcsm-cma as a platform driver Laurent Pinchart
2020-05-04  9:26 ` [PATCH v2 26/34] staging: vchiq_arm: Set up dma ranges on child devices Laurent Pinchart
2020-05-04 16:54   ` Nicolas Saenz Julienne
2020-08-25 16:57     ` Jacopo Mondi
2020-05-04  9:26 ` [PATCH v2 27/34] staging: vchiq: Use the old dma controller for OF config on platform devices Laurent Pinchart
2020-05-04 15:44   ` Nicolas Saenz Julienne
2020-05-04  9:26 ` [PATCH v2 28/34] staging: vchiq_2835_arm: Implement a DMA pool for small bulk transfers Laurent Pinchart
2020-05-04  9:26 ` [PATCH v2 29/34] staging: vchiq: Add 36-bit address support Laurent Pinchart
2020-05-04 17:40   ` Nicolas Saenz Julienne
2020-05-04 20:46     ` Phil Elwell [this message]
2020-05-05 10:13       ` Nicolas Saenz Julienne
2020-05-05 10:57         ` Phil Elwell
2020-05-05 13:22   ` kbuild test robot
2020-05-04  9:26 ` [PATCH v2 30/34] staging: vchiq_arm: Give vchiq children DT nodes Laurent Pinchart
2020-05-04 17:12   ` Nicolas Saenz Julienne
2020-05-04 19:42     ` Phil Elwell
2020-05-05 10:37       ` Nicolas Saenz Julienne
2020-05-05 10:50         ` Phil Elwell
2020-05-04  9:26 ` [PATCH v2 31/34] staging: vchiq_arm: Add a matching unregister call Laurent Pinchart
2020-05-04  9:26 ` [PATCH v2 32/34] media: videobuf2: Allow exporting of a struct dmabuf Laurent Pinchart
2020-05-04 13:36   ` Hans Verkuil
2020-05-04  9:26 ` [PATCH v2 33/34] staging: bcm2835-isp: Add support for BC2835 ISP Laurent Pinchart
2020-05-11 19:19   ` Nicolas Saenz Julienne
2020-05-18 13:38     ` Dave Stevenson
2020-05-20 13:46       ` Nicolas Saenz Julienne
2020-05-18 12:02   ` Hans Verkuil
2020-05-18 14:36     ` Dave Stevenson
2020-05-18 15:07       ` Hans Verkuil
2020-05-19 12:47     ` Naushir Patuck
2020-05-19 13:03       ` Jacopo Mondi
2020-06-24 11:28       ` Hans Verkuil
2020-05-04  9:26 ` [PATCH v2 34/34] staging: vchiq: Load bcm2835_isp driver from vchiq Laurent Pinchart
2020-05-04 15:15 ` [PATCH v2 00/34] Drivers for the BCM283x CSI-2/CCP2 receiver and ISP Nicolas Saenz Julienne
2020-05-04 15:38   ` Laurent Pinchart
2020-05-04 16:15     ` Nicolas Saenz Julienne

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