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From: Serge Semin <fancer.lancer@gmail.com>
To: Tony Luck <tony.luck@intel.com>
Cc: Borislav Petkov <bp@alien8.de>,
	Serge Semin <Sergey.Semin@baikalelectronics.ru>,
	Michal Simek <michal.simek@xilinx.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	James Morse <james.morse@arm.com>,
	Robert Richter <rric@kernel.org>,
	Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
	Michail Ivanov <Michail.Ivanov@baikalelectronics.ru>,
	Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
	Punnaiah Choudary Kalluri  <punnaiah.choudary.kalluri@xilinx.com>,
	Manish Narani <manish.narani@xilinx.com>,
	Dinh Nguyen <dinguyen@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND v3 13/17] EDAC/mc: Add MC unique index allocation procedure
Date: Thu, 13 Oct 2022 00:31:13 +0300	[thread overview]
Message-ID: <20221012213113.fop4kqqtu43hka4b@mobilestation> (raw)
In-Reply-To: <Y0cnS0uOtjmYL7fQ@agluck-desk3.sc.intel.com>

On Wed, Oct 12, 2022 at 01:44:59PM -0700, Tony Luck wrote:
> On Wed, Oct 12, 2022 at 10:33:35PM +0200, Borislav Petkov wrote:
> > On Wed, Oct 12, 2022 at 11:01:54PM +0300, Serge Semin wrote:
> 
> > "A new special MC index is introduced here. It's defined by the
> > EDAC_AUTO_MC_NUM macro with a value specifically chosen as the least
> > probable value used for the real MC index. In case if the EDAC_AUTO_MC_NUM
> > index is specified by the EDAC LLDD, the MC index will be either retrieved
> > from the MC device OF-node alias index ("mc[:number:]") or automatically
> > generated as the next-free MC index found by the ID allocation procedure."
> 

> Just curious.If I have an EDAC driver using EDAC_AUTO_MC_NUM, and I
> unload and reload the driver a bunch of times. Do I get the same memory
> controller numbers each reload, or get an ever increasing set each time?

You'll get the same numbers if no other device-driver allocated them
(which we already established isn't relevant to EDAC since only one
driver per system is supposed to work). In order to implement what you
said I should have called idr_alloc_cyclic() instead.

Here is what the suggested implementation implies:

1. If there is a particular ID assigned in the framework of the dts aliases
(i.e. mcX = &ddr0) then that value will be selected for the controller.
2. If no particular ID is assigned but there are mcX-like aliases
defined in DTS, then the next free id greater than the last mcX value
will be assigned.
3. If none if the above is relevant the first free ID in the pool will be
allocated.
4. On the driver unload the driver remove method will be called thus
the allocated ID will be freed on the MC-controller de-registration.
Thus on the next driver loading the freed IDs will be reused by the
idr_alloc() method design.

-Sergey

> 
> -Tony

  reply	other threads:[~2022-10-12 21:31 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-29 23:26 [PATCH RESEND v3 00/17] EDAC/mc/synopsys: Various fixes and cleanups Serge Semin
2022-09-29 23:26 ` [PATCH RESEND v3 01/17] EDAC/synopsys: Fix native uMCTL2 IRQs handling procedure Serge Semin
2022-10-31 17:24   ` Borislav Petkov
2023-09-01 11:24     ` Serge Semin
2022-09-29 23:26 ` [PATCH RESEND v3 02/17] EDAC/synopsys: Fix generic device type detection procedure Serge Semin
2022-09-29 23:26 ` [PATCH RESEND v3 03/17] EDAC/synopsys: Fix mci->scrub_cap field setting Serge Semin
2022-09-29 23:26 ` [PATCH RESEND v3 04/17] EDAC/synopsys: Drop erroneous ADDRMAP4.addrmap_col_b10 parse Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 05/17] EDAC/synopsys: Fix reading errors count before ECC status Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 06/17] EDAC/synopsys: Use platform device devm ioremap method Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 07/17] EDAC/synopsys: Drop internal CE and UE counters Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 08/17] EDAC/synopsys: Drop local to_mci macro implementation Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 09/17] EDAC/synopsys: Drop struct ecc_error_info.blknr field Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 10/17] EDAC/synopsys: Shorten out struct ecc_error_info.bankgrpnr field name Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 11/17] EDAC/synopsys: Drop redundant info from error message Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 12/17] EDAC/mc: Init DIMM labels in MC registration method Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 13/17] EDAC/mc: Add MC unique index allocation procedure Serge Semin
2022-10-12 17:29   ` Borislav Petkov
2022-10-12 20:01     ` Serge Semin
2022-10-12 20:33       ` Borislav Petkov
2022-10-12 20:44         ` Tony Luck
2022-10-12 21:31           ` Serge Semin [this message]
2022-10-12 22:30         ` Serge Semin
2022-10-13  9:38           ` Borislav Petkov
2022-09-29 23:27 ` [PATCH RESEND v3 14/17] EDAC/synopsys: Detach Zynq DDRC controller support Serge Semin
2022-09-30 14:42   ` Borislav Petkov
2022-10-06 12:17     ` Serge Semin
2022-10-06 13:25       ` Borislav Petkov
2022-10-08  0:42         ` Serge Semin
2022-10-12 17:28           ` Borislav Petkov
2022-10-12 19:27             ` Serge Semin
2022-10-12 19:44               ` Borislav Petkov
2022-10-12 20:55                 ` Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 15/17] EDAC/synopsys: Drop unused platform-specific setup API Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 16/17] EDAC/synopsys: Unify the driver entities naming Serge Semin
2022-09-29 23:27 ` [PATCH RESEND v3 17/17] EDAC/synopsys: Convert to using BIT/GENMASK/FIELD_x macros Serge Semin
2022-09-30 14:29 ` [PATCH RESEND v3 00/17] EDAC/mc/synopsys: Various fixes and cleanups Borislav Petkov
2022-10-06  7:13   ` Michal Simek
2023-08-18 23:06 ` Serge Semin

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