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GET /api/1.2/patches/2224334/?format=api
{ "id": 2224334, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2224334/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260417-sdcard-performance-b4-v4-2-119e66be10c2@avm.de/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.2/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260417-sdcard-performance-b4-v4-2-119e66be10c2@avm.de>", "list_archive_url": null, "date": "2026-04-17T09:51:35", "name": "[v4,2/7] hw/sd/sd: Allow multi-byte read/write for generic paths", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "8de49898289a35921fbd083018aedd408df5c650", "submitter": { "id": 91343, "url": "http://patchwork.ozlabs.org/api/1.2/people/91343/?format=api", "name": "Christian Speich", "email": "c.speich@avm.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260417-sdcard-performance-b4-v4-2-119e66be10c2@avm.de/mbox/", "series": [ { "id": 500297, "url": "http://patchwork.ozlabs.org/api/1.2/series/500297/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500297", "date": "2026-04-17T09:51:34", "name": "hw/sd: Improve performance of read/write/erase", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/500297/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224334/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224334/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=avm.de header.i=@avm.de header.a=rsa-sha256\n header.s=mail header.b=E28HWfUH;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fxr0s2pD9z1yDF\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 17 Apr 2026 19:58:05 +1000 (AEST)", "from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from <qemu-devel-bounces@nongnu.org>)\n\tid 1wDfxO-0003Ek-Ct; Fri, 17 Apr 2026 05:57:50 -0400", "from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <c.speich@avm.de>)\n id 1wDfx9-0002jW-I8; Fri, 17 Apr 2026 05:57:35 -0400", "from mail.avm.de ([212.42.244.119])\n by eggs.gnu.org with esmtps (TLS1.2:DHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from <c.speich@avm.de>)\n id 1wDfx5-000302-HO; Fri, 17 Apr 2026 05:57:35 -0400", "from [172.16.0.1] (helo=mail.avm.de)\n by mail.avm.de with ESMTP (eXpurgate 4.55.2)\n (envelope-from <c.speich@avm.de>)\n id 69e20405-1e6c-7f0000032729-7f000001c518-1\n for <multiple-recipients>; Fri, 17 Apr 2026 11:57:25 +0200", "from mail-notes.avm.de (mail-notes.avm.de [172.16.0.1])\n by mail.avm.de (Postfix) with ESMTP;\n Fri, 17 Apr 2026 11:57:25 +0200 (CEST)", "from [127.0.1.1] ([172.17.89.139])\n by mail-notes.avm.de (HCL Domino Release 14.0FP4)\n with ESMTP id 2026041711572443-2975 ;\n Fri, 17 Apr 2026 11:57:24 +0200" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=avm.de; s=mail;\n t=1776419845; bh=hEncSpiJ83XFws/L5Xd2Q4V9lgBRfDDWRPUG5zSMWVU=;\n h=From:Date:Subject:References:In-Reply-To:To:Cc:From;\n b=E28HWfUHpE7UwXsF/9AJCkDWBgBQMTs2CFrv+Y79SGIPEBnx1twKaG+80LpmPQcCG\n VKRtrAz5GGEp6yvdveMg7qdAvej/86a8GBoWYkcIwJOo6Ixgj5xETcy0Oiy6ExlpQ8\n 3xG4GXoft2Fa1WD1V8sFtMbWSMQCealMpA6DaKvA=", "From": "Christian Speich <c.speich@avm.de>", "Date": "Fri, 17 Apr 2026 11:51:35 +0200", "Subject": "[PATCH v4 2/7] hw/sd/sd: Allow multi-byte read/write for generic\n paths", "MIME-Version": "1.0", "Message-Id": "<20260417-sdcard-performance-b4-v4-2-119e66be10c2@avm.de>", "References": "<20260417-sdcard-performance-b4-v4-0-119e66be10c2@avm.de>", "In-Reply-To": "<20260417-sdcard-performance-b4-v4-0-119e66be10c2@avm.de>", "To": "qemu-devel@nongnu.org", "Cc": "=?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@linaro.org>,\n Bin Meng <bmeng.cn@gmail.com>, qemu-block@nongnu.org,\n Marcel Apfelbaum <marcel.apfelbaum@gmail.com>,\n Yanan Wang <wangyanan55@huawei.com>, Zhao Liu <zhao1.liu@intel.com>,\n Christian Speich <c.speich@avm.de>", "X-Mailer": "b4 0.14.2", "X-MIMETrack": "Itemize by SMTP Server on ANIS1/AVM(Release 14.0FP4|March 10,\n 2025) at 17.04.2026 11:57:24,\n Serialize by Router on ANIS1/AVM(Release 14.0FP4|March 10, 2025) at\n 17.04.2026 11:57:24, Serialize complete at 17.04.2026 11:57:24", "X-TNEFEvaluated": "1", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain; charset=\"utf-8\"", "X-purgate-ID": "149429::1776419845-38707233-2F1C2574/0/0", "X-purgate-type": "clean", "X-purgate-size": "7064", "X-purgate-Ad": "Categorized by eleven eXpurgate (R) https://www.eleven.de", "X-purgate": [ "This mail is considered clean (visit https://www.eleven.de for\n further information)", "clean" ], "Received-SPF": "pass client-ip=212.42.244.119; envelope-from=c.speich@avm.de;\n helo=mail.avm.de", "X-Spam_score_int": "-48", "X-Spam_score": "-4.9", "X-Spam_bar": "----", "X-Spam_report": "(-4.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.54,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Paths that use sd_generic_write/read_data can now write/read multiple\nbytes with one call.\n\nSigned-off-by: Christian Speich <c.speich@avm.de>\nReviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>\n---\n hw/sd/sd.c | 62 +++++++++++++++++++++++++++++++++++---------------------------\n 1 file changed, 35 insertions(+), 27 deletions(-)", "diff": "diff --git a/hw/sd/sd.c b/hw/sd/sd.c\nindex 135113add29b5ee3cb11d9d535355eba8f6cb3f7..2c81776df316feda75f97e15cc9bbd1538f1a21c 100644\n--- a/hw/sd/sd.c\n+++ b/hw/sd/sd.c\n@@ -1609,7 +1609,7 @@ static sd_rsp_type_t sd_cmd_optional(SDState *sd, SDRequest req)\n return sd_illegal;\n }\n \n-/* Configure fields for following sd_generic_write_byte() calls */\n+/* Configure fields for following sd_generic_write_data() calls */\n static sd_rsp_type_t sd_cmd_to_receivingdata(SDState *sd, SDRequest req,\n uint64_t start, size_t size)\n {\n@@ -1624,7 +1624,7 @@ static sd_rsp_type_t sd_cmd_to_receivingdata(SDState *sd, SDRequest req,\n return sd_r1;\n }\n \n-/* Configure fields for following sd_generic_read_byte() calls */\n+/* Configure fields for following sd_generic_read_data() calls */\n static sd_rsp_type_t sd_cmd_to_sendingdata(SDState *sd, SDRequest req,\n uint64_t start,\n const void *data, size_t size)\n@@ -2614,11 +2614,15 @@ send_response:\n }\n \n /* Return true if buffer is consumed. Configured by sd_cmd_to_receivingdata() */\n-static bool sd_generic_write_byte(SDState *sd, uint8_t value)\n+static bool sd_generic_write_data(SDState *sd, const void *buf, size_t *len)\n {\n- sd->data[sd->data_offset] = value;\n+ size_t to_write = MIN(sd->data_size - sd->data_offset, *len);\n \n- if (++sd->data_offset >= sd->data_size) {\n+ memcpy(sd->data, buf, to_write);\n+ sd->data_offset += to_write;\n+ *len = to_write;\n+\n+ if (sd->data_offset >= sd->data_size) {\n sd->state = sd_transfer_state;\n return true;\n }\n@@ -2626,11 +2630,15 @@ static bool sd_generic_write_byte(SDState *sd, uint8_t value)\n }\n \n /* Return true when buffer is consumed. Configured by sd_cmd_to_sendingdata() */\n-static bool sd_generic_read_byte(SDState *sd, uint8_t *value)\n+static bool sd_generic_read_data(SDState *sd, void *buf, size_t *len)\n {\n- *value = sd->data[sd->data_offset];\n+ size_t to_read = MIN(sd->data_size - sd->data_offset, *len);\n+\n+ memcpy(buf, sd->data, to_read);\n+ sd->data_offset += to_read;\n+ *len = to_read;\n \n- if (++sd->data_offset >= sd->data_size) {\n+ if (sd->data_offset >= sd->data_size) {\n sd->state = sd_transfer_state;\n return true;\n }\n@@ -2657,18 +2665,12 @@ static size_t sd_write_data(SDState *sd, const void *buf, size_t length)\n if (sd->card_status & (ADDRESS_ERROR | WP_VIOLATION))\n return length;\n \n- /*\n- * Only read one byte at a time. We will be called again with the\n- * remaining.\n- */\n- length = 1;\n-\n trace_sdcard_write_data(sd->proto->name,\n sd->last_cmd_name,\n sd->current_cmd, sd->data_offset, value[0]);\n switch (sd->current_cmd) {\n case 24: /* CMD24: WRITE_SINGLE_BLOCK */\n- if (sd_generic_write_byte(sd, value[0])) {\n+ if (sd_generic_write_data(sd, buf, &length)) {\n /* TODO: Check CRC before committing */\n sd->state = sd_programming_state;\n sd_blk_write(sd, sd->data_start, sd->data_offset);\n@@ -2680,6 +2682,12 @@ static size_t sd_write_data(SDState *sd, const void *buf, size_t length)\n break;\n \n case 25: /* CMD25: WRITE_MULTIPLE_BLOCK */\n+ /*\n+ * Only read one byte at a time. We will be called again with the\n+ * remaining.\n+ */\n+ length = 1;\n+\n if (sd->data_offset == 0) {\n /* Start of the block - let's check the address is valid */\n if (!address_in_range(sd, \"WRITE_MULTIPLE_BLOCK\",\n@@ -2723,7 +2731,7 @@ static size_t sd_write_data(SDState *sd, const void *buf, size_t length)\n break;\n \n case 26: /* CMD26: PROGRAM_CID */\n- if (sd_generic_write_byte(sd, value[0])) {\n+ if (sd_generic_write_data(sd, buf, &length)) {\n /* TODO: Check CRC before committing */\n sd->state = sd_programming_state;\n for (i = 0; i < sizeof(sd->cid); i ++)\n@@ -2741,7 +2749,7 @@ static size_t sd_write_data(SDState *sd, const void *buf, size_t length)\n break;\n \n case 27: /* CMD27: PROGRAM_CSD */\n- if (sd_generic_write_byte(sd, value[0])) {\n+ if (sd_generic_write_data(sd, buf, &length)) {\n /* TODO: Check CRC before committing */\n sd->state = sd_programming_state;\n for (i = 0; i < sizeof(sd->csd); i ++)\n@@ -2764,7 +2772,7 @@ static size_t sd_write_data(SDState *sd, const void *buf, size_t length)\n break;\n \n case 42: /* CMD42: LOCK_UNLOCK */\n- if (sd_generic_write_byte(sd, value[0])) {\n+ if (sd_generic_write_data(sd, buf, &length)) {\n /* TODO: Check CRC before committing */\n sd->state = sd_programming_state;\n sd_lock_command(sd);\n@@ -2774,7 +2782,7 @@ static size_t sd_write_data(SDState *sd, const void *buf, size_t length)\n break;\n \n case 56: /* CMD56: GEN_CMD */\n- sd_generic_write_byte(sd, value[0]);\n+ sd_generic_write_data(sd, buf, &length);\n break;\n \n default:\n@@ -2809,12 +2817,6 @@ static size_t sd_read_data(SDState *sd, void *buf, size_t length)\n return length;\n }\n \n- /*\n- * We will only read one byte at a time. We will be called again with the\n- * remaining buffer.\n- */\n- length = 1;\n-\n io_len = sd_blk_len(sd);\n \n trace_sdcard_read_data(sd->proto->name,\n@@ -2832,10 +2834,16 @@ static size_t sd_read_data(SDState *sd, void *buf, size_t length)\n case 30: /* CMD30: SEND_WRITE_PROT */\n case 51: /* ACMD51: SEND_SCR */\n case 56: /* CMD56: GEN_CMD */\n- sd_generic_read_byte(sd, value);\n+ sd_generic_read_data(sd, buf, &length);\n break;\n \n case 18: /* CMD18: READ_MULTIPLE_BLOCK */\n+ /*\n+ * We will only read one byte at a time. We will be called again with\n+ * the remaining buffer.\n+ */\n+ length = 1;\n+\n if (sd->data_offset == 0) {\n if (!address_in_range(sd, \"READ_MULTIPLE_BLOCK\",\n sd->data_start, io_len)) {\n@@ -2868,7 +2876,7 @@ static size_t sd_read_data(SDState *sd, void *buf, size_t length)\n default:\n qemu_log_mask(LOG_GUEST_ERROR, \"%s: DAT read illegal for command %s\\n\",\n __func__, sd->last_cmd_name);\n- *value = dummy_byte;\n+ memset(buf, dummy_byte, length);\n }\n \n return length;\n", "prefixes": [ "v4", "2/7" ] }