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Tue, 25 Jan 2022 02:48:31 -0800 (PST) From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra Cc: Boris Brezillon , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/4] mtd: track maximum number of bitflips for each read request Date: Tue, 25 Jan 2022 11:48:19 +0100 Message-Id: <20220125104822.8420-2-kernel@kempniu.pl> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220125104822.8420-1-kernel@kempniu.pl> References: <20220125104822.8420-1-kernel@kempniu.pl> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220125_024835_752479_A2E586A2 X-CRM114-Status: GOOD ( 15.88 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org bXRkX3JlYWRfb29iKCkgY2FsbGVycyBhcmUgY3VycmVudGx5IG9ibGl2aW91cyB0byB0aGUgZGV0 YWlscyBvZiBFQ0MKZXJyb3JzIGRldGVjdGVkIGR1cmluZyB0aGUgcmVhZCBvcGVyYXRpb24gLSB0 aGV5IG9ubHkgbGVhcm4gKHRocm91Z2ggdGhlCnJldHVybiB2YWx1ZSkgd2hldGhlciBhbnkgY29y cmVjdGVkIGJpdGZsaXBzIG9yIHVuY29ycmVjdGFibGUgZXJyb3JzCm9jY3VycmVkLiAgTW9yZSBk ZXRhaWxlZCBFQ0MgaW5mb3JtYXRpb24gY2FuIGJlIHVzZWZ1bCB0byB1c2VyLXNwYWNlCmFwcGxp Y2F0aW9ucyBmb3IgbWFraW5nIGJldHRlci1pbmZvcm1lZCBjaG9pY2VzIGFib3V0IG1vdmluZyBk YXRhCmFyb3VuZC4KCkV4dGVuZCBzdHJ1Y3QgbXRkX29vYl9vcHMgd2l0aCBhIHBvaW50ZXIgdG8g YSBuZXdseS1pbnRyb2R1Y2VkIHN0cnVjdAptdGRfcmVxX3N0YXRzIGFuZCBzZXQgaXRzICdtYXhf Yml0ZmxpcHMnIGZpZWxkIHRvIHRoZSBtYXhpbXVtIG51bWJlciBvZgpiaXRmbGlwcyBmb3VuZCBp biBhIHNpbmdsZSBFQ0Mgc3RlcCBkdXJpbmcgdGhlIHJlYWQgb3BlcmF0aW9uIHBlcmZvcm1lZApi eSBtdGRfcmVhZF9vb2IoKS4gVGhpcyBpcyBhIHByZXJlcXVpc2l0ZSBmb3IgdWx0aW1hdGVseSBw YXNzaW5nIHRoYXQKdmFsdWUgYmFjayB0byB1c2VyIHNwYWNlLgoKU3VnZ2VzdGVkLWJ5OiBCb3Jp cyBCcmV6aWxsb24gPGJvcmlzLmJyZXppbGxvbkBjb2xsYWJvcmEuY29tPgpTaWduZWQtb2ZmLWJ5 OiBNaWNoYcWCIEvEmXBpZcWEIDxrZXJuZWxAa2VtcG5pdS5wbD4KLS0tCiBkcml2ZXJzL210ZC9t dGRjb3JlLmMgICB8IDUgKysrKysKIGluY2x1ZGUvbGludXgvbXRkL210ZC5oIHwgNSArKysrKwog MiBmaWxlcyBjaGFuZ2VkLCAxMCBpbnNlcnRpb25zKCspCgpkaWZmIC0tZ2l0IGEvZHJpdmVycy9t dGQvbXRkY29yZS5jIGIvZHJpdmVycy9tdGQvbXRkY29yZS5jCmluZGV4IDcwZjQ5MmRjZTE1OC4u OTQyM2FmNmRiMzg1IDEwMDY0NAotLS0gYS9kcml2ZXJzL210ZC9tdGRjb3JlLmMKKysrIGIvZHJp dmVycy9tdGQvbXRkY29yZS5jCkBAIC0xNTc1LDYgKzE1NzUsOSBAQCBpbnQgbXRkX3JlYWRfb29i KHN0cnVjdCBtdGRfaW5mbyAqbXRkLCBsb2ZmX3QgZnJvbSwgc3RydWN0IG10ZF9vb2Jfb3BzICpv cHMpCiAJaWYgKCFtYXN0ZXItPl9yZWFkX29vYiAmJiAoIW1hc3Rlci0+X3JlYWQgfHwgb3BzLT5v b2JidWYpKQogCQlyZXR1cm4gLUVPUE5PVFNVUFA7CiAKKwlpZiAob3BzLT5zdGF0cykKKwkJbWVt c2V0KG9wcy0+c3RhdHMsIDAsIHNpemVvZigqb3BzLT5zdGF0cykpOworCiAJaWYgKG10ZC0+Zmxh Z3MgJiBNVERfU0xDX09OX01MQ19FTVVMQVRJT04pCiAJCXJldF9jb2RlID0gbXRkX2lvX2VtdWxh dGVkX3NsYyhtdGQsIGZyb20sIHRydWUsIG9wcyk7CiAJZWxzZQpAQCAtMTU5Miw2ICsxNTk1LDgg QEAgaW50IG10ZF9yZWFkX29vYihzdHJ1Y3QgbXRkX2luZm8gKm10ZCwgbG9mZl90IGZyb20sIHN0 cnVjdCBtdGRfb29iX29wcyAqb3BzKQogCQlyZXR1cm4gcmV0X2NvZGU7CiAJaWYgKG10ZC0+ZWNj X3N0cmVuZ3RoID09IDApCiAJCXJldHVybiAwOwkvKiBkZXZpY2UgbGFja3MgZWNjICovCisJaWYg KG9wcy0+c3RhdHMpCisJCW9wcy0+c3RhdHMtPm1heF9iaXRmbGlwcyA9IHJldF9jb2RlOwogCXJl dHVybiByZXRfY29kZSA+PSBtdGQtPmJpdGZsaXBfdGhyZXNob2xkID8gLUVVQ0xFQU4gOiAwOwog fQogRVhQT1JUX1NZTUJPTF9HUEwobXRkX3JlYWRfb29iKTsKZGlmZiAtLWdpdCBhL2luY2x1ZGUv bGludXgvbXRkL210ZC5oIGIvaW5jbHVkZS9saW51eC9tdGQvbXRkLmgKaW5kZXggMWZmYTkzMzEy MWY2Li5mOTc2YWFiY2IzNzggMTAwNjQ0Ci0tLSBhL2luY2x1ZGUvbGludXgvbXRkL210ZC5oCisr KyBiL2luY2x1ZGUvbGludXgvbXRkL210ZC5oCkBAIC00MCw2ICs0MCwxMCBAQCBzdHJ1Y3QgbXRk X2VyYXNlX3JlZ2lvbl9pbmZvIHsKIAl1bnNpZ25lZCBsb25nICpsb2NrbWFwOwkJLyogSWYga2Vl cGluZyBiaXRtYXAgb2YgbG9ja3MgKi8KIH07CiAKK3N0cnVjdCBtdGRfcmVxX3N0YXRzIHsKKwl1 bnNpZ25lZCBpbnQgbWF4X2JpdGZsaXBzOworfTsKKwogLyoqCiAgKiBzdHJ1Y3QgbXRkX29vYl9v cHMgLSBvb2Igb3BlcmF0aW9uIG9wZXJhbmRzCiAgKiBAbW9kZToJb3BlcmF0aW9uIG1vZGUKQEAg LTcwLDYgKzc0LDcgQEAgc3RydWN0IG10ZF9vb2Jfb3BzIHsKIAl1aW50MzJfdAlvb2JvZmZzOwog CXVpbnQ4X3QJCSpkYXRidWY7CiAJdWludDhfdAkJKm9vYmJ1ZjsKKwlzdHJ1Y3QgbXRkX3JlcV9z dGF0cyAqc3RhdHM7CiB9OwogCiAvKioKLS0gCjIuMzQuMQoKCl9fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpMaW51eCBNVEQgZGlzY3Vzc2lvbiBt YWlsaW5nIGxpc3QKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9s aW51eC1tdGQvCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2474C433EF for ; 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Tue, 25 Jan 2022 02:48:31 -0800 (PST) From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra Cc: Boris Brezillon , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 1/4] mtd: track maximum number of bitflips for each read request Date: Tue, 25 Jan 2022 11:48:19 +0100 Message-Id: <20220125104822.8420-2-kernel@kempniu.pl> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220125104822.8420-1-kernel@kempniu.pl> References: <20220125104822.8420-1-kernel@kempniu.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mtd_read_oob() callers are currently oblivious to the details of ECC errors detected during the read operation - they only learn (through the return value) whether any corrected bitflips or uncorrectable errors occurred. More detailed ECC information can be useful to user-space applications for making better-informed choices about moving data around. Extend struct mtd_oob_ops with a pointer to a newly-introduced struct mtd_req_stats and set its 'max_bitflips' field to the maximum number of bitflips found in a single ECC step during the read operation performed by mtd_read_oob(). This is a prerequisite for ultimately passing that value back to user space. Suggested-by: Boris Brezillon Signed-off-by: Michał Kępień --- drivers/mtd/mtdcore.c | 5 +++++ include/linux/mtd/mtd.h | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 70f492dce158..9423af6db385 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1575,6 +1575,9 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) if (!master->_read_oob && (!master->_read || ops->oobbuf)) return -EOPNOTSUPP; + if (ops->stats) + memset(ops->stats, 0, sizeof(*ops->stats)); + if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) ret_code = mtd_io_emulated_slc(mtd, from, true, ops); else @@ -1592,6 +1595,8 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) return ret_code; if (mtd->ecc_strength == 0) return 0; /* device lacks ecc */ + if (ops->stats) + ops->stats->max_bitflips = ret_code; return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; } EXPORT_SYMBOL_GPL(mtd_read_oob); diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 1ffa933121f6..f976aabcb378 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -40,6 +40,10 @@ struct mtd_erase_region_info { unsigned long *lockmap; /* If keeping bitmap of locks */ }; +struct mtd_req_stats { + unsigned int max_bitflips; +}; + /** * struct mtd_oob_ops - oob operation operands * @mode: operation mode @@ -70,6 +74,7 @@ struct mtd_oob_ops { uint32_t ooboffs; uint8_t *datbuf; uint8_t *oobbuf; + struct mtd_req_stats *stats; }; /** -- 2.34.1