From patchwork Thu May 6 19:13:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 12243051 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1AEDCC433ED for ; Thu, 6 May 2021 18:58:45 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DAE8661001 for ; Thu, 6 May 2021 18:58:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DAE8661001 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 486EA6ECF4; Thu, 6 May 2021 18:57:26 +0000 (UTC) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2426B6ED05; Thu, 6 May 2021 18:57:13 +0000 (UTC) IronPort-SDR: Dn7+fghrPzA104SV4vYHmDAMpY9OwfNLCsRDzJVDH1gF3Q97pJ3okX6Rzhz4Zhh5U0iyL5etAw wL+gSlPHLlXQ== X-IronPort-AV: E=McAfee;i="6200,9189,9976"; a="198195441" X-IronPort-AV: E=Sophos;i="5.82,278,1613462400"; d="scan'208";a="198195441" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2021 11:57:11 -0700 IronPort-SDR: RZJDVtU5qFgvvTC7JjxoyzDmBTtVCM8LxuDdrqXBdWIofZY0cnKLuaGS5X9y0Az792zbwsJagK 6T07RV08fiMQ== X-IronPort-AV: E=Sophos;i="5.82,278,1613462400"; d="scan'208";a="469583434" Received: from dhiatt-server.jf.intel.com ([10.54.81.3]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 May 2021 11:57:09 -0700 From: Matthew Brost To: , Subject: [RFC PATCH 25/97] drm/i915/guc: New definition of the CTB descriptor Date: Thu, 6 May 2021 12:13:39 -0700 Message-Id: <20210506191451.77768-26-matthew.brost@intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20210506191451.77768-1-matthew.brost@intel.com> References: <20210506191451.77768-1-matthew.brost@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: matthew.brost@intel.com, tvrtko.ursulin@intel.com, daniele.ceraolospurio@intel.com, jason.ekstrand@intel.com, jon.bloomfield@intel.com, daniel.vetter@intel.com, john.c.harrison@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Michal Wajdeczko Definition of the CTB descriptor has changed, leaving only minimal shared fields like HEAD/TAIL/STATUS. Both HEAD and TAIL are now in dwords. Add some ABI documentation and implement required changes. GuC: 57.0.0 GuC: 60.0.0 Signed-off-by: Michal Wajdeczko Signed-off-by: Matthew Brost --- .../gt/uc/abi/guc_communication_ctb_abi.h | 70 ++++++++++++++----- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 70 +++++++++---------- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h | 2 +- 3 files changed, 85 insertions(+), 57 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h index d38935f47ecf..c2a069a78e01 100644 --- a/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h +++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_communication_ctb_abi.h @@ -7,6 +7,58 @@ #define _ABI_GUC_COMMUNICATION_CTB_ABI_H #include +#include + +#include "guc_messages_abi.h" + +/** + * DOC: CT Buffer + * + * TBD + */ + +/** + * DOC: CTB Descriptor + * + * +---+-------+--------------------------------------------------------------+ + * | | Bits | Description | + * +===+=======+==============================================================+ + * | 0 | 31:0 | **HEAD** - offset (in dwords) to the last dword that was | + * | | | read from the `CT Buffer`_. | + * | | | It can only be updated by the receiver. | + * +---+-------+--------------------------------------------------------------+ + * | 1 | 31:0 | **TAIL** - offset (in dwords) to the last dword that was | + * | | | written to the `CT Buffer`_. | + * | | | It can only be updated by the sender. | + * +---+-------+--------------------------------------------------------------+ + * | 2 | 31:0 | **STATUS** - status of the CTB | + * | | | | + * | | | - _`GUC_CTB_STATUS_NO_ERROR` = 0 (normal operation) | + * | | | - _`GUC_CTB_STATUS_OVERFLOW` = 1 (head/tail too large) | + * | | | - _`GUC_CTB_STATUS_UNDERFLOW` = 2 (truncated message) | + * | | | - _`GUC_CTB_STATUS_MISMATCH` = 4 (head/tail modified) | + * | | | - _`GUC_CTB_STATUS_NO_BACKCHANNEL` = 8 | + * | | | - _`GUC_CTB_STATUS_MALFORMED_MSG` = 16 | + * +---+-------+--------------------------------------------------------------+ + * |...| | RESERVED = MBZ | + * +---+-------+--------------------------------------------------------------+ + * | 15| 31:0 | RESERVED = MBZ | + * +---+-------+--------------------------------------------------------------+ + */ + +struct guc_ct_buffer_desc { + u32 head; + u32 tail; + u32 status; +#define GUC_CTB_STATUS_NO_ERROR 0 +#define GUC_CTB_STATUS_OVERFLOW (1 << 0) +#define GUC_CTB_STATUS_UNDERFLOW (1 << 1) +#define GUC_CTB_STATUS_MISMATCH (1 << 2) +#define GUC_CTB_STATUS_NO_BACKCHANNEL (1 << 3) +#define GUC_CTB_STATUS_MALFORMED_MSG (1 << 4) + u32 reserved[13]; +} __packed; +static_assert(sizeof(struct guc_ct_buffer_desc) == 64); /** * DOC: CTB based communication @@ -60,24 +112,6 @@ * - **flags**, holds various bits to control message handling */ -/* - * Describes single command transport buffer. - * Used by both guc-master and clients. - */ -struct guc_ct_buffer_desc { - u32 addr; /* gfx address */ - u64 host_private; /* host private data */ - u32 size; /* size in bytes */ - u32 head; /* offset updated by GuC*/ - u32 tail; /* offset updated by owner */ - u32 is_in_error; /* error indicator */ - u32 reserved1; - u32 reserved2; - u32 owner; /* id of the channel owner */ - u32 owner_sub_id; /* owner-defined field for extra tracking */ - u32 reserved[5]; -} __packed; - /* Type of command transport buffer */ #define INTEL_GUC_CT_BUFFER_TYPE_SEND 0x0u #define INTEL_GUC_CT_BUFFER_TYPE_RECV 0x1u diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c index 178f73ab2c96..282df9706912 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -112,32 +112,28 @@ static inline const char *guc_ct_buffer_type_to_str(u32 type) } } -static void guc_ct_buffer_desc_init(struct guc_ct_buffer_desc *desc, - u32 cmds_addr, u32 size) +static void guc_ct_buffer_desc_init(struct guc_ct_buffer_desc *desc) { memset(desc, 0, sizeof(*desc)); - desc->addr = cmds_addr; - desc->size = size; - desc->owner = CTB_OWNER_HOST; } -static void guc_ct_buffer_reset(struct intel_guc_ct_buffer *ctb, u32 cmds_addr) +static void guc_ct_buffer_reset(struct intel_guc_ct_buffer *ctb) { ctb->broken = false; - guc_ct_buffer_desc_init(ctb->desc, cmds_addr, ctb->size); + guc_ct_buffer_desc_init(ctb->desc); } static void guc_ct_buffer_init(struct intel_guc_ct_buffer *ctb, struct guc_ct_buffer_desc *desc, - u32 *cmds, u32 size) + u32 *cmds, u32 size_in_bytes) { - GEM_BUG_ON(size % 4); + GEM_BUG_ON(size_in_bytes % 4); ctb->desc = desc; ctb->cmds = cmds; - ctb->size = size; + ctb->size = size_in_bytes / 4; - guc_ct_buffer_reset(ctb, 0); + guc_ct_buffer_reset(ctb); } static int guc_action_register_ct_buffer(struct intel_guc *guc, @@ -279,10 +275,10 @@ int intel_guc_ct_enable(struct intel_guc_ct *ct) /* (re)initialize descriptors */ cmds = base + ptrdiff(ct->ctbs.send.cmds, blob); - guc_ct_buffer_reset(&ct->ctbs.send, cmds); + guc_ct_buffer_reset(&ct->ctbs.send); cmds = base + ptrdiff(ct->ctbs.recv.cmds, blob); - guc_ct_buffer_reset(&ct->ctbs.recv, cmds); + guc_ct_buffer_reset(&ct->ctbs.recv); /* * Register both CT buffers starting with RECV buffer. @@ -369,17 +365,15 @@ static int ct_write(struct intel_guc_ct *ct, if (unlikely(ctb->broken)) return -EPIPE; - if (unlikely(desc->is_in_error)) + if (unlikely(desc->status)) goto corrupted; - if (unlikely(!IS_ALIGNED(head | tail, 4) || - (tail | head) >= size)) + if (unlikely((tail | head) >= size)) { + CT_ERROR(ct, "Invalid offsets head=%u tail=%u (size=%u)\n", + head, tail, size); + desc->status |= GUC_CTB_STATUS_OVERFLOW; goto corrupted; - - /* later calculations will be done in dwords */ - head /= 4; - tail /= 4; - size /= 4; + } /* * tail == head condition indicates empty. GuC FW does not support @@ -419,14 +413,14 @@ static int ct_write(struct intel_guc_ct *ct, } GEM_BUG_ON(tail > size); - /* now update desc tail (back in bytes) */ - desc->tail = tail * 4; + /* now update descriptor */ + WRITE_ONCE(desc->tail, tail); + return 0; corrupted: - CT_ERROR(ct, "Corrupted descriptor addr=%#x head=%u tail=%u size=%u\n", - desc->addr, desc->head, desc->tail, desc->size); - desc->is_in_error = 1; + CT_ERROR(ct, "Corrupted descriptor head=%u tail=%u status=%#x\n", + desc->head, desc->tail, desc->status); ctb->broken = true; return -EPIPE; } @@ -616,17 +610,15 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) if (unlikely(ctb->broken)) return -EPIPE; - if (unlikely(desc->is_in_error)) + if (unlikely(desc->status)) goto corrupted; - if (unlikely(!IS_ALIGNED(head | tail, 4) || - (tail | head) >= size)) + if (unlikely((tail | head) >= size)) { + CT_ERROR(ct, "Invalid offsets head=%u tail=%u (size=%u)\n", + head, tail, size); + desc->status |= GUC_CTB_STATUS_OVERFLOW; goto corrupted; - - /* later calculations will be done in dwords */ - head /= 4; - tail /= 4; - size /= 4; + } /* tail == head condition indicates empty */ available = tail - head; @@ -653,6 +645,7 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) size - head : available - 1), &cmds[head], 4 * (head + available - 1 > size ? available - 1 - size + head : 0), &cmds[0]); + desc->status |= GUC_CTB_STATUS_UNDERFLOW; goto corrupted; } @@ -675,13 +668,14 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) } CT_DEBUG(ct, "received %*ph\n", 4 * len, (*msg)->msg); - desc->head = head * 4; + /* now update descriptor */ + WRITE_ONCE(desc->head, head); + return available - len; corrupted: - CT_ERROR(ct, "Corrupted descriptor addr=%#x head=%u tail=%u size=%u\n", - desc->addr, desc->head, desc->tail, desc->size); - desc->is_in_error = 1; + CT_ERROR(ct, "Corrupted descriptor head=%u tail=%u status=%#x\n", + desc->head, desc->tail, desc->status); ctb->broken = true; return -EPIPE; } diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h index 7d3cd375d6a7..905202caaad3 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h @@ -31,7 +31,7 @@ struct intel_guc; * @lock: protects access to the commands buffer and buffer descriptor * @desc: pointer to the buffer descriptor * @cmds: pointer to the commands buffer - * @size: size of the commands buffer + * @size: size of the commands buffer in dwords * @broken: flag to indicate if descriptor data is broken */ struct intel_guc_ct_buffer {