From patchwork Tue Mar 8 09:38:05 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mullati Siva X-Patchwork-Id: 12773389 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 1C340C433F5 for ; Tue, 8 Mar 2022 09:39:34 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9319210E230; Tue, 8 Mar 2022 09:39:33 +0000 (UTC) Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTPS id 83B9B10E2A9 for ; Tue, 8 Mar 2022 09:39:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1646732371; x=1678268371; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5FlzvLR/r1ymh7OZzEstFAiWgGuju635HbkWTgk6vtU=; b=SSkCsfeIGrhBIbZ7me6oURoWuVyd2I/+LwFRJ2Q1QAu8VZTTpmWsLtVr oB0hQyCaaDVpyoVG9mhZx9OH8f9L+yu1Ppbrn52eb/UEBzREpSaQXepOo ycOaryYWgjk47IZOmncwBBet5aveGTQrDvEBJQlTk7KZoBJIJvXiXtBjJ DefXIyy4F137CyTJJ5DVYNsYOQly10dMc2JJ76rOqjOkCbhHqN3MsmZND +dU2H/cZC3XQYtt+NqkurO9/MOi+6N1P3mFhPY361jQI8FwSQ/1j/Y23H 8EfyhI98sqbT9gdutKzRvZpqizi1lGdCqVPuUJkTSFRi8XEulhWyCg5mO w==; X-IronPort-AV: E=McAfee;i="6200,9189,10279"; a="242079098" X-IronPort-AV: E=Sophos;i="5.90,164,1643702400"; d="scan'208";a="242079098" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Mar 2022 01:38:29 -0800 X-IronPort-AV: E=Sophos;i="5.90,164,1643702400"; d="scan'208";a="537502163" Received: from sseethax-mobl1.gar.corp.intel.com (HELO smullati-desk.gar.corp.intel.com) ([10.213.81.146]) by orsmga007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Mar 2022 01:38:27 -0800 From: Mullati Siva To: intel-gfx@lists.freedesktop.org, siva.mullati@intel.com Date: Tue, 8 Mar 2022 15:08:05 +0530 Message-Id: <20220308093805.879262-3-siva.mullati@intel.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20220308093805.879262-1-siva.mullati@intel.com> References: <20220308093805.879262-1-siva.mullati@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 2/2] drm/i915/guc: Convert ct buffer to iosys_map X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lucas.demarchi@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" From: Siva Mullati Convert CT commands and descriptors to use iosys_map rather than plain pointer and save it in the intel_guc_ct_buffer struct. This will help with ct_write and ct_read for cmd send and receive after the initialization by abstracting the IO vs system memory. Signed-off-by: Siva Mullati --- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c | 170 +++++++++++++--------- drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h | 9 +- 2 files changed, 110 insertions(+), 69 deletions(-) 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 f01325cd1b62..457deca1c25a 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c @@ -44,6 +44,11 @@ static inline struct drm_device *ct_to_drm(struct intel_guc_ct *ct) #define CT_PROBE_ERROR(_ct, _fmt, ...) \ i915_probe_error(ct_to_i915(ct), "CT: " _fmt, ##__VA_ARGS__) +#define ct_desc_read(desc_map_, field_) \ + iosys_map_rd_field(desc_map_, 0, struct guc_ct_buffer_desc, field_) +#define ct_desc_write(desc_map_, field_, val_) \ + iosys_map_wr_field(desc_map_, 0, struct guc_ct_buffer_desc, field_, val_) + /** * DOC: CTB Blob * @@ -113,9 +118,9 @@ void intel_guc_ct_init_early(struct intel_guc_ct *ct) init_waitqueue_head(&ct->wq); } -static void guc_ct_buffer_desc_init(struct guc_ct_buffer_desc *desc) +static void guc_ct_buffer_desc_init(struct iosys_map *desc) { - memset(desc, 0, sizeof(*desc)); + iosys_map_memset(desc, 0, 0, sizeof(struct guc_ct_buffer_desc)); } static void guc_ct_buffer_reset(struct intel_guc_ct_buffer *ctb) @@ -128,17 +133,24 @@ static void guc_ct_buffer_reset(struct intel_guc_ct_buffer *ctb) space = CIRC_SPACE(ctb->tail, ctb->head, ctb->size) - ctb->resv_space; atomic_set(&ctb->space, space); - guc_ct_buffer_desc_init(ctb->desc); + guc_ct_buffer_desc_init(&ctb->desc_map); } static void guc_ct_buffer_init(struct intel_guc_ct_buffer *ctb, - struct guc_ct_buffer_desc *desc, - u32 *cmds, u32 size_in_bytes, u32 resv_space) + void *desc, void *cmds, u32 size_in_bytes, + u32 resv_space, bool lmem) { GEM_BUG_ON(size_in_bytes % 4); - ctb->desc = desc; - ctb->cmds = cmds; + if (lmem) { + iosys_map_set_vaddr_iomem(&ctb->desc_map, + (void __iomem *)desc); + iosys_map_set_vaddr_iomem(&ctb->cmds_map, + (void __iomem *)cmds); + } else { + iosys_map_set_vaddr(&ctb->desc_map, desc); + iosys_map_set_vaddr(&ctb->cmds_map, cmds); + } ctb->size = size_in_bytes / 4; ctb->resv_space = resv_space / 4; @@ -218,13 +230,12 @@ static int ct_register_buffer(struct intel_guc_ct *ct, bool send, int intel_guc_ct_init(struct intel_guc_ct *ct) { struct intel_guc *guc = ct_to_guc(ct); - struct guc_ct_buffer_desc *desc; u32 blob_size; u32 cmds_size; u32 resv_space; - void *blob; - u32 *cmds; + void *blob, *desc, *cmds; int err; + bool lmem; err = i915_inject_probe_error(guc_to_gt(guc)->i915, -ENXIO); if (err) @@ -242,6 +253,8 @@ int intel_guc_ct_init(struct intel_guc_ct *ct) CT_DEBUG(ct, "base=%#x size=%u\n", intel_guc_ggtt_offset(guc, ct->vma), blob_size); + lmem = i915_gem_object_is_lmem(ct->vma->obj); + /* store pointers to desc and cmds for send ctb */ desc = blob; cmds = blob + 2 * CTB_DESC_SIZE; @@ -251,7 +264,8 @@ int intel_guc_ct_init(struct intel_guc_ct *ct) ptrdiff(desc, blob), ptrdiff(cmds, blob), cmds_size, resv_space); - guc_ct_buffer_init(&ct->ctbs.send, desc, cmds, cmds_size, resv_space); + guc_ct_buffer_init(&ct->ctbs.send, + desc, cmds, cmds_size, resv_space, lmem); /* store pointers to desc and cmds for recv ctb */ desc = blob + CTB_DESC_SIZE; @@ -262,7 +276,8 @@ int intel_guc_ct_init(struct intel_guc_ct *ct) ptrdiff(desc, blob), ptrdiff(cmds, blob), cmds_size, resv_space); - guc_ct_buffer_init(&ct->ctbs.recv, desc, cmds, cmds_size, resv_space); + guc_ct_buffer_init(&ct->ctbs.recv, + desc, cmds, cmds_size, resv_space, lmem); return 0; } @@ -279,6 +294,10 @@ void intel_guc_ct_fini(struct intel_guc_ct *ct) tasklet_kill(&ct->receive_tasklet); i915_vma_unpin_and_release(&ct->vma, I915_VMA_RELEASE_MAP); + iosys_map_clear(&ct->ctbs.send.desc_map); + iosys_map_clear(&ct->ctbs.send.cmds_map); + iosys_map_clear(&ct->ctbs.recv.desc_map); + iosys_map_clear(&ct->ctbs.recv.cmds_map); memset(ct, 0, sizeof(*ct)); } @@ -291,6 +310,7 @@ void intel_guc_ct_fini(struct intel_guc_ct *ct) int intel_guc_ct_enable(struct intel_guc_ct *ct) { struct intel_guc *guc = ct_to_guc(ct); + struct iosys_map blob_map; u32 base, desc, cmds, size; void *blob; int err; @@ -302,9 +322,14 @@ int intel_guc_ct_enable(struct intel_guc_ct *ct) GEM_BUG_ON(!i915_gem_object_has_pinned_pages(ct->vma->obj)); base = intel_guc_ggtt_offset(guc, ct->vma); - /* blob should start with send descriptor */ blob = __px_vaddr(ct->vma->obj); - GEM_BUG_ON(blob != ct->ctbs.send.desc); + if (i915_gem_object_is_lmem(ct->vma->obj)) + iosys_map_set_vaddr_iomem(&blob_map, (void __iomem *)blob); + else + iosys_map_set_vaddr(&blob_map, blob); + + /* blob should start with send descriptor */ + GEM_BUG_ON(!iosys_map_is_equal(&blob_map, &ct->ctbs.send.desc_map)); /* (re)initialize descriptors */ guc_ct_buffer_reset(&ct->ctbs.send); @@ -314,15 +339,15 @@ int intel_guc_ct_enable(struct intel_guc_ct *ct) * Register both CT buffers starting with RECV buffer. * Descriptors are in first half of the blob. */ - desc = base + ptrdiff(ct->ctbs.recv.desc, blob); - cmds = base + ptrdiff(ct->ctbs.recv.cmds, blob); + desc = base + iosys_map_ptrdiff(&ct->ctbs.recv.desc_map, &blob_map); + cmds = base + iosys_map_ptrdiff(&ct->ctbs.recv.cmds_map, &blob_map); size = ct->ctbs.recv.size * 4; err = ct_register_buffer(ct, false, desc, cmds, size); if (unlikely(err)) goto err_out; - desc = base + ptrdiff(ct->ctbs.send.desc, blob); - cmds = base + ptrdiff(ct->ctbs.send.cmds, blob); + desc = base + iosys_map_ptrdiff(&ct->ctbs.send.desc_map, &blob_map); + cmds = base + iosys_map_ptrdiff(&ct->ctbs.send.cmds_map, &blob_map); size = ct->ctbs.send.size * 4; err = ct_register_buffer(ct, true, desc, cmds, size); if (unlikely(err)) @@ -371,31 +396,35 @@ static int ct_write(struct intel_guc_ct *ct, u32 fence, u32 flags) { struct intel_guc_ct_buffer *ctb = &ct->ctbs.send; - struct guc_ct_buffer_desc *desc = ctb->desc; + struct iosys_map desc = ctb->desc_map; + struct iosys_map cmds = ctb->cmds_map; u32 tail = ctb->tail; u32 size = ctb->size; u32 header; u32 hxg; u32 type; - u32 *cmds = ctb->cmds; + u32 status = ct_desc_read(&desc, status); unsigned int i; - if (unlikely(desc->status)) + if (unlikely(status)) goto corrupted; GEM_BUG_ON(tail > size); #ifdef CONFIG_DRM_I915_DEBUG_GUC - if (unlikely(tail != READ_ONCE(desc->tail))) { + if (unlikely(tail != ct_desc_read(&desc, tail))) { CT_ERROR(ct, "Tail was modified %u != %u\n", - desc->tail, tail); - desc->status |= GUC_CTB_STATUS_MISMATCH; + ct_desc_read(&desc, tail), tail); + status |= GUC_CTB_STATUS_MISMATCH; + ct_desc_write(&desc, status, status); goto corrupted; } - if (unlikely(READ_ONCE(desc->head) >= size)) { + if (unlikely(ct_desc_read(&desc, head) >= size)) { CT_ERROR(ct, "Invalid head offset %u >= %u)\n", - desc->head, size); - desc->status |= GUC_CTB_STATUS_OVERFLOW; + ct_desc_read(&desc, head), size); + status = ct_desc_read(&desc, status) | + GUC_CTB_STATUS_OVERFLOW; + ct_desc_write(&desc, status, status); goto corrupted; } #endif @@ -418,14 +447,14 @@ static int ct_write(struct intel_guc_ct *ct, CT_DEBUG(ct, "writing (tail %u) %*ph %*ph %*ph\n", tail, 4, &header, 4, &hxg, 4 * (len - 1), &action[1]); - cmds[tail] = header; + iosys_map_wr(&cmds, (4 * tail), u32, header); tail = (tail + 1) % size; - cmds[tail] = hxg; + iosys_map_wr(&cmds, (4 * tail), u32, hxg); tail = (tail + 1) % size; for (i = 1; i < len; i++) { - cmds[tail] = action[i]; + iosys_map_wr(&cmds, (4 * tail), u32, action[i]); tail = (tail + 1) % size; } GEM_BUG_ON(tail > size); @@ -442,13 +471,14 @@ static int ct_write(struct intel_guc_ct *ct, atomic_sub(len + GUC_CTB_HDR_LEN, &ctb->space); /* now update descriptor */ - WRITE_ONCE(desc->tail, tail); + ct_desc_write(&desc, tail, tail); return 0; corrupted: CT_ERROR(ct, "Corrupted descriptor head=%u tail=%u status=%#x\n", - desc->head, desc->tail, desc->status); + ct_desc_read(&desc, head), ct_desc_read(&desc, tail), + ct_desc_read(&desc, status)); ctb->broken = true; return -EPIPE; } @@ -499,20 +529,21 @@ static inline bool ct_deadlocked(struct intel_guc_ct *ct) bool ret = ktime_ms_delta(ktime_get(), ct->stall_time) > timeout; if (unlikely(ret)) { - struct guc_ct_buffer_desc *send = ct->ctbs.send.desc; - struct guc_ct_buffer_desc *recv = ct->ctbs.send.desc; + struct iosys_map send = ct->ctbs.send.desc_map; + struct iosys_map recv = ct->ctbs.recv.desc_map; CT_ERROR(ct, "Communication stalled for %lld ms, desc status=%#x,%#x\n", ktime_ms_delta(ktime_get(), ct->stall_time), - send->status, recv->status); + ct_desc_read(&send, status), + ct_desc_read(&recv, status)); CT_ERROR(ct, "H2G Space: %u (Bytes)\n", atomic_read(&ct->ctbs.send.space) * 4); - CT_ERROR(ct, "Head: %u (Dwords)\n", ct->ctbs.send.desc->head); - CT_ERROR(ct, "Tail: %u (Dwords)\n", ct->ctbs.send.desc->tail); + CT_ERROR(ct, "Head: %u (Dwords)\n", ct_desc_read(&send, head)); + CT_ERROR(ct, "Tail: %u (Dwords)\n", ct_desc_read(&send, tail)); CT_ERROR(ct, "G2H Space: %u (Bytes)\n", atomic_read(&ct->ctbs.recv.space) * 4); - CT_ERROR(ct, "Head: %u\n (Dwords)", ct->ctbs.recv.desc->head); - CT_ERROR(ct, "Tail: %u\n (Dwords)", ct->ctbs.recv.desc->tail); + CT_ERROR(ct, "Head: %u\n (Dwords)", ct_desc_read(&recv, head)); + CT_ERROR(ct, "Tail: %u\n (Dwords)", ct_desc_read(&recv, tail)); ct->ctbs.send.broken = true; } @@ -549,18 +580,20 @@ static inline void g2h_release_space(struct intel_guc_ct *ct, u32 g2h_len_dw) static inline bool h2g_has_room(struct intel_guc_ct *ct, u32 len_dw) { struct intel_guc_ct_buffer *ctb = &ct->ctbs.send; - struct guc_ct_buffer_desc *desc = ctb->desc; + struct iosys_map desc = ctb->desc_map; u32 head; u32 space; + u32 status = ct_desc_read(&desc, status); if (atomic_read(&ctb->space) >= len_dw) return true; - head = READ_ONCE(desc->head); + head = ct_desc_read(&desc, head); if (unlikely(head > ctb->size)) { CT_ERROR(ct, "Invalid head offset %u >= %u)\n", head, ctb->size); - desc->status |= GUC_CTB_STATUS_OVERFLOW; + status |= GUC_CTB_STATUS_OVERFLOW; + ct_desc_write(&desc, status, status); ctb->broken = true; return false; } @@ -803,11 +836,12 @@ static void ct_free_msg(struct ct_incoming_msg *msg) static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) { struct intel_guc_ct_buffer *ctb = &ct->ctbs.recv; - struct guc_ct_buffer_desc *desc = ctb->desc; + struct iosys_map desc = ctb->desc_map; + struct iosys_map cmds = ctb->cmds_map; u32 head = ctb->head; - u32 tail = READ_ONCE(desc->tail); + u32 tail = ct_desc_read(&desc, tail); u32 size = ctb->size; - u32 *cmds = ctb->cmds; + u32 status = ct_desc_read(&desc, status); s32 available; unsigned int len; unsigned int i; @@ -816,23 +850,26 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) if (unlikely(ctb->broken)) return -EPIPE; - if (unlikely(desc->status)) + if (unlikely(status)) goto corrupted; GEM_BUG_ON(head > size); #ifdef CONFIG_DRM_I915_DEBUG_GUC - if (unlikely(head != READ_ONCE(desc->head))) { + if (unlikely(head != ct_desc_read(&desc, head))) { CT_ERROR(ct, "Head was modified %u != %u\n", - desc->head, head); - desc->status |= GUC_CTB_STATUS_MISMATCH; + ct_desc_read(&desc, head), head); + status |= GUC_CTB_STATUS_MISMATCH; + ct_desc_write(&desc, status, status); goto corrupted; } #endif if (unlikely(tail >= size)) { CT_ERROR(ct, "Invalid tail offset %u >= %u)\n", tail, size); - desc->status |= GUC_CTB_STATUS_OVERFLOW; + status = ct_desc_read(&desc, status) | + GUC_CTB_STATUS_OVERFLOW; + ct_desc_write(&desc, status, status); goto corrupted; } @@ -849,7 +886,7 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) CT_DEBUG(ct, "available %d (%u:%u:%u)\n", available, head, tail, size); GEM_BUG_ON(available < 0); - header = cmds[head]; + header = iosys_map_rd(&cmds, (4 * head), u32); head = (head + 1) % size; /* message len with header */ @@ -857,11 +894,13 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) if (unlikely(len > (u32)available)) { CT_ERROR(ct, "Incomplete message %*ph %*ph %*ph\n", 4, &header, + 4 * (head + available - 1 > size ? size - head : + available - 1), (cmds.vaddr + (4 * head)), 4 * (head + available - 1 > size ? - size - head : available - 1), &cmds[head], - 4 * (head + available - 1 > size ? - available - 1 - size + head : 0), &cmds[0]); - desc->status |= GUC_CTB_STATUS_UNDERFLOW; + available - 1 - size + head : 0), cmds.vaddr); + status = ct_desc_read(&desc, status) | + GUC_CTB_STATUS_UNDERFLOW; + ct_desc_write(&desc, status, status); goto corrupted; } @@ -869,17 +908,17 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) if (!*msg) { CT_ERROR(ct, "No memory for message %*ph %*ph %*ph\n", 4, &header, + 4 * (head + available - 1 > size ? size - head : + available - 1), (cmds.vaddr + (4 * head)), 4 * (head + available - 1 > size ? - size - head : available - 1), &cmds[head], - 4 * (head + available - 1 > size ? - available - 1 - size + head : 0), &cmds[0]); + available - 1 - size + head : 0), cmds.vaddr); return available; } (*msg)->msg[0] = header; for (i = 1; i < len; i++) { - (*msg)->msg[i] = cmds[head]; + (*msg)->msg[i] = iosys_map_rd(&cmds, (4 * head), u32); head = (head + 1) % size; } CT_DEBUG(ct, "received %*ph\n", 4 * len, (*msg)->msg); @@ -888,13 +927,14 @@ static int ct_read(struct intel_guc_ct *ct, struct ct_incoming_msg **msg) ctb->head = head; /* now update descriptor */ - WRITE_ONCE(desc->head, head); + ct_desc_write(&desc, head, head); return available - len; corrupted: CT_ERROR(ct, "Corrupted descriptor head=%u tail=%u status=%#x\n", - desc->head, desc->tail, desc->status); + ct_desc_read(&desc, head), ct_desc_read(&desc, tail), + ct_desc_read(&desc, status)); ctb->broken = true; return -EPIPE; } @@ -1211,13 +1251,13 @@ void intel_guc_ct_print_info(struct intel_guc_ct *ct, drm_printf(p, "H2G Space: %u\n", atomic_read(&ct->ctbs.send.space) * 4); drm_printf(p, "Head: %u\n", - ct->ctbs.send.desc->head); + ct_desc_read(&ct->ctbs.send.desc_map, head)); drm_printf(p, "Tail: %u\n", - ct->ctbs.send.desc->tail); + ct_desc_read(&ct->ctbs.send.desc_map, tail)); drm_printf(p, "G2H Space: %u\n", atomic_read(&ct->ctbs.recv.space) * 4); drm_printf(p, "Head: %u\n", - ct->ctbs.recv.desc->head); + ct_desc_read(&ct->ctbs.recv.desc_map, head)); drm_printf(p, "Tail: %u\n", - ct->ctbs.recv.desc->tail); + ct_desc_read(&ct->ctbs.recv.desc_map, tail)); } 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 f709a19c7e21..867fe13fb47d 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.h @@ -7,6 +7,7 @@ #define _INTEL_GUC_CT_H_ #include +#include #include #include #include @@ -32,8 +33,8 @@ struct drm_printer; * holds the commands. * * @lock: protects access to the commands buffer and buffer descriptor - * @desc: pointer to the buffer descriptor - * @cmds: pointer to the commands buffer + * @desc: iosys map to the buffer descriptor + * @cmds: iosys map to the commands buffer * @size: size of the commands buffer in dwords * @resv_space: reserved space in buffer in dwords * @head: local shadow copy of head in dwords @@ -43,8 +44,8 @@ struct drm_printer; */ struct intel_guc_ct_buffer { spinlock_t lock; - struct guc_ct_buffer_desc *desc; - u32 *cmds; + struct iosys_map desc_map; + struct iosys_map cmds_map; u32 size; u32 resv_space; u32 tail;