From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Ben Widawsky <ben.widawsky@intel.com>
Cc: linux-cxl@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
linux-pci@vger.kernel.org, Bjorn Helgaas <helgaas@kernel.org>,
Chris Browy <cbrowy@avery-design.com>,
Christoph Hellwig <hch@infradead.org>,
David Hildenbrand <david@redhat.com>,
David Rientjes <rientjes@google.com>,
Jon Masters <jcm@jonmasters.org>,
Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
Rafael Wysocki <rafael.j.wysocki@intel.com>,
Randy Dunlap <rdunlap@infradead.org>,
"John Groves (jgroves)" <jgroves@micron.com>,
"Kelley, Sean V" <sean.v.kelley@intel.com>,
Ariel Sibley <Ariel.Sibley@microchip.com>
Subject: Re: [PATCH v5 5/9] cxl/mem: Add a "RAW" send command
Date: Fri, 19 Feb 2021 20:03:57 -0500 [thread overview]
Message-ID: <YDBf/QD8LMFi6JbH@Konrads-MacBook-Pro.local> (raw)
In-Reply-To: <20210217040958.1354670-6-ben.widawsky@intel.com>
On Tue, Feb 16, 2021 at 08:09:54PM -0800, Ben Widawsky wrote:
> The CXL memory device send interface will have a number of supported
> commands. The raw command is not such a command. Raw commands allow
> userspace to send a specified opcode to the underlying hardware and
> bypass all driver checks on the command. The primary use for this
> command is to [begrudgingly] allow undocumented vendor specific hardware
> commands.
>
> While not the main motivation, it also allows prototyping new hardware
> commands without a driver patch and rebuild.
>
> While this all sounds very powerful it comes with a couple of caveats:
> 1. Bug reports using raw commands will not get the same level of
> attention as bug reports using supported commands (via taint).
> 2. Supported commands will be rejected by the RAW command.
>
> With this comes new debugfs knob to allow full access to your toes with
> your weapon of choice.
>
> Cc: Ariel Sibley <Ariel.Sibley@microchip.com>
> Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
> Reviewed-by: Dan Williams <dan.j.williams@intel.com> (v2)
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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WARNING: multiple messages have this Message-ID (diff)
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Ben Widawsky <ben.widawsky@intel.com>
Cc: linux-cxl@vger.kernel.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
linux-pci@vger.kernel.org, Bjorn Helgaas <helgaas@kernel.org>,
Chris Browy <cbrowy@avery-design.com>,
Christoph Hellwig <hch@infradead.org>,
Dan Williams <dan.j.williams@intel.com>,
David Hildenbrand <david@redhat.com>,
David Rientjes <rientjes@google.com>,
Ira Weiny <ira.weiny@intel.com>, Jon Masters <jcm@jonmasters.org>,
Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
Rafael Wysocki <rafael.j.wysocki@intel.com>,
Randy Dunlap <rdunlap@infradead.org>,
Vishal Verma <vishal.l.verma@intel.com>,
"John Groves (jgroves)" <jgroves@micron.com>,
"Kelley, Sean V" <sean.v.kelley@intel.com>,
Ariel Sibley <Ariel.Sibley@microchip.com>
Subject: Re: [PATCH v5 5/9] cxl/mem: Add a "RAW" send command
Date: Fri, 19 Feb 2021 20:03:57 -0500 [thread overview]
Message-ID: <YDBf/QD8LMFi6JbH@Konrads-MacBook-Pro.local> (raw)
In-Reply-To: <20210217040958.1354670-6-ben.widawsky@intel.com>
On Tue, Feb 16, 2021 at 08:09:54PM -0800, Ben Widawsky wrote:
> The CXL memory device send interface will have a number of supported
> commands. The raw command is not such a command. Raw commands allow
> userspace to send a specified opcode to the underlying hardware and
> bypass all driver checks on the command. The primary use for this
> command is to [begrudgingly] allow undocumented vendor specific hardware
> commands.
>
> While not the main motivation, it also allows prototyping new hardware
> commands without a driver patch and rebuild.
>
> While this all sounds very powerful it comes with a couple of caveats:
> 1. Bug reports using raw commands will not get the same level of
> attention as bug reports using supported commands (via taint).
> 2. Supported commands will be rejected by the RAW command.
>
> With this comes new debugfs knob to allow full access to your toes with
> your weapon of choice.
>
> Cc: Ariel Sibley <Ariel.Sibley@microchip.com>
> Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
> Reviewed-by: Dan Williams <dan.j.williams@intel.com> (v2)
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
next prev parent reply other threads:[~2021-02-20 1:05 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-17 4:09 [PATCH v5 0/9] CXL 2.0 Support Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-17 4:09 ` [PATCH v5 1/9] cxl/mem: Introduce a driver for CXL-2.0-Type-3 endpoints Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-20 0:54 ` Konrad Rzeszutek Wilk
2021-02-20 0:54 ` Konrad Rzeszutek Wilk
2021-02-17 4:09 ` [PATCH v5 2/9] cxl/mem: Find device capabilities Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-17 12:22 ` Jonathan Cameron
2021-02-17 12:22 ` Jonathan Cameron
2021-02-17 4:09 ` [PATCH v5 3/9] cxl/mem: Register CXL memX devices Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-17 4:09 ` [PATCH v5 4/9] cxl/mem: Add basic IOCTL interface Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-17 14:16 ` Jonathan Cameron
2021-02-17 14:16 ` Jonathan Cameron
2021-02-20 1:22 ` Konrad Rzeszutek Wilk
2021-02-20 1:22 ` Konrad Rzeszutek Wilk
2021-02-20 16:33 ` Ben Widawsky
2021-02-20 16:33 ` Ben Widawsky
2021-02-20 17:48 ` Dan Williams
2021-02-20 17:48 ` Dan Williams
2021-02-17 4:09 ` [PATCH v5 5/9] cxl/mem: Add a "RAW" send command Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-20 1:03 ` Konrad Rzeszutek Wilk [this message]
2021-02-20 1:03 ` Konrad Rzeszutek Wilk
2021-02-17 4:09 ` [PATCH v5 6/9] cxl/mem: Enable commands via CEL Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-20 1:11 ` Konrad Rzeszutek Wilk
2021-02-20 1:11 ` Konrad Rzeszutek Wilk
2021-02-17 4:09 ` [PATCH v5 7/9] cxl/mem: Add set of informational commands Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-20 1:12 ` Konrad Rzeszutek Wilk
2021-02-20 1:12 ` Konrad Rzeszutek Wilk
2021-02-17 4:09 ` [PATCH v5 8/9] MAINTAINERS: Add maintainers of the CXL driver Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
2021-02-17 4:09 ` [RFC PATCH v5 9/9] cxl/mem: Add payload dumping for debug Ben Widawsky
2021-02-17 4:09 ` Ben Widawsky
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