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Mon, 27 Feb 2023 22:42:42 +0000 Message-ID: Date: Mon, 27 Feb 2023 14:42:30 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0 Thunderbird/102.4.2 Subject: Re: [PATCH v1 0/6] PolarFire SoC Auto Update Support Content-Language: en-US To: Conor Dooley CC: Conor Dooley , Xu Yilun , Daire McNamara , Rob Herring , Krzysztof Kozlowski , Moritz Fischer , Wu Hao , Tom Rix , , , , References: <20230217164023.14255-1-conor@kernel.org> <21bebf9d-eb27-5607-b0a9-274c46ef8aa3@intel.com> From: Russ Weight In-Reply-To: X-ClientProxiedBy: MW4PR04CA0284.namprd04.prod.outlook.com (2603:10b6:303:89::19) To DM5PR11MB1899.namprd11.prod.outlook.com (2603:10b6:3:10b::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM5PR11MB1899:EE_|LV2PR11MB6069:EE_ X-MS-Office365-Filtering-Correlation-Id: 6737323c-845f-413c-4887-08db1913ef8b X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 2/27/23 14:16, Conor Dooley wrote: > Hey Russ, > > On Mon, Feb 27, 2023 at 02:04:36PM -0800, Russ Weight wrote: >> On 2/24/23 00:28, Conor Dooley wrote: >>> On Fri, Feb 24, 2023 at 03:57:09PM +0800, Xu Yilun wrote: >>>> On 2023-02-17 at 16:40:17 +0000, Conor Dooley wrote: >>>>> This patchset adds support for the "Auto Update" feature on PolarFire >>>>> SoC that allows for writing an FPGA bistream to the SPI flash connected >>>>> to the system controller. >>>> I haven't fully checked the patches yet, just some quick comments: >>>> >>>> Since this feature is just to R/W the flash, and would not affect the >>>> runtime FPGA region, I don't think an FPGA manager is actually needed. >>>> Why not just use the MTD uAPI? There is a set of exsiting MTD uAPI & >>>> MTD tool if I remember correctly. >>> A lack of interest in opening up the system controller to userspace! >>> You're right in that the writing of the image can be done that way, and >>> while I was testing I used the userspace bits of mtd along the way - but >>> for validating that the image we are writing we rely on the system >>> controller. >>> I'm really not interested in exposing the system controller's >>> functionality, especially the bitstream manipulation parts, to userspace >>> due to the risk of input validation bugs, so at least that side of >>> things should remain in the kernel. >>> I suppose I could implement something custom in drivers/soc that does >>> the validation only, and push the rest out to userspace. Just seemed >>> fitting to do the whole lot in drivers/fpga. >> In case you haven't already looked at the new firmware-upload >> support in the firmware-loader, I'll give you some references >> here to see if it fit you needs. This would only support the >> write (not the read) but it would allow the controller to do >> validation on the write. >> >> The is the cover letter which shows a usage example: >> https://lore.kernel.org/lkml/20220421212204.36052-1-russell.h.weight@intel.com/ >> >> And this is a pointer to the latest documentation for it: >> https://docs.kernel.org/driver-api/firmware/fw_upload.html >> >> The only current user is: drivers/fpga/intel-m10-bmc-sec-update.c > Sounds interesting, I shall go and take a look. Just quickly, when you > say it wouldn't support the read, what exactly do you mean? > The only read that I am really interested in doing is reading the first > 1K of flash as I need to RMW it, but I don't think that that's what you > mean. > Do you mean that I would not be able to dump the firmware using your > fw_upload interface? If so, that's an acceptable constraint IMO. Yes - I mean that you couldn't dump the firmware image from userspace using the fw_upload interface. The sysfs interface allows you to read and write a temporary buffer, but once you "echo 0 > loading", there is no sysfs interface associated with the firmware-loader that would allow you to read the image from flash. Your controller actually does the writes, so RMW in that context is fine. - Russ > > Your interface also circumvents us (Microchip) defining yet another > method for interacting with the FPGA, since from my nosing around, > everyone seems to do something different. > > Cheers, > Conor. > _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv