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Wed, 14 Feb 2024 00:00:11 -0800 (PST) Message-ID: <7b3c08b0-80ed-4409-96d4-d55b938df6f4@linaro.org> Date: Wed, 14 Feb 2024 08:00:06 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] spi: spi-mem: add statistics support to ->exec_op() calls To: =?UTF-8?Q?Th=C3=A9o_Lebrun?= , Mark Brown Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Dhruva Gole , Gregory CLEMENT , Vladimir Kondratiev , Thomas Petazzoni , Tawfik Bayouk References: <20240209-spi-mem-stats-v1-1-dd1a422fc015@bootlin.com> Content-Language: en-US From: Tudor Ambarus In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 2/13/24 15:00, Théo Lebrun wrote: > Hello Tudor, Hi! > > On Tue Feb 13, 2024 at 1:39 PM CET, Tudor Ambarus wrote: >>> /** >>> * spi_mem_exec_op() - Execute a memory operation >>> * @mem: the SPI memory >>> @@ -339,8 +383,12 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) >>> * read path) and expect the core to use the regular SPI >>> * interface in other cases. >>> */ >>> - if (!ret || ret != -ENOTSUPP || ret != -EOPNOTSUPP) >>> + if (!ret || ret != -ENOTSUPP || ret != -EOPNOTSUPP) { >>> + spi_mem_add_op_stats(ctlr->pcpu_statistics, op, ret); >>> + spi_mem_add_op_stats(mem->spi->pcpu_statistics, op, ret); >>> + >> >> Would be good to be able to opt out the statistics if one wants it. >> >> SPI NORs can write with a single write op maximum page_size bytes, which >> is typically 256 bytes. And since there are SPI NORs that can run at 400 >> MHz, I guess some performance penalty shouldn't be excluded. > > I did my testing on a 40 MHz octal SPI NOR with most reads being much > bigger than 256 bytes, so I probably didn't have the fastest setup > indeed. yeah, reads are bigger, the entire flash can be read with a single read op. > > What shape would that take? A spi-mem DT prop? New field in the SPI > statistics sysfs directory? > I think I'd go with a sysfs entry, it provides flexibility. But I guess we can worry about this if we have some numbers, and I don't have, so you're fine even without the opt-out option. > Other remarks have been taken into account, thanks! > Ok, thanks. Cheers, ta