From patchwork Sat Oct 19 19:20:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Matthew Brost X-Patchwork-Id: 13842872 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 517F1D3C92E for ; Sat, 19 Oct 2024 19:20:15 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 4C37A10E3B4; Sat, 19 Oct 2024 19:20:07 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="PJIejuHU"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.17]) by gabe.freedesktop.org (Postfix) with ESMTPS id 374A910E3AA; Sat, 19 Oct 2024 19:20:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729365605; x=1760901605; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=T+3+mUn65i0LFR+EqTxgGf6IBD8UueUBauc02U88mmo=; b=PJIejuHUL0kj3d2Qmmx0G7HXkXIAfUy6gJT6SKw0hje4fQ2xQmuLuKpe lKxf4i5nUxvZnoUB6VJ2pzHsbhiDpoapP5uvEBr9H91xpA3wkWNiaZ2pN ooraWdZC/NiPOFTP+4uj2g3GDjZWzNSaFkiWH/jVX36dbliJzI7oZt/Lf qbCLZbUZLv/GN5HA9gb3EzQEySISObKYGoENHx8jP1f/dEXZtWXPmHpqo XA/qAcCdYBrSEShXGoLLMBLEEJMpEYxXHnI/07jBmctZLrWR1SEPNIIwq qEvnXQJdeo/JdVG1i2iLrREkb2ClnX7fhWkZ5BOs4BBqpjg+TECezFpDP Q==; X-CSE-ConnectionGUID: Y4nUAeCOTwmQpcDfxKBm2w== X-CSE-MsgGUID: YLh5rc8YQ/2+9FtPsF9KMw== X-IronPort-AV: E=McAfee;i="6700,10204,11230"; a="28978584" X-IronPort-AV: E=Sophos;i="6.11,217,1725346800"; d="scan'208";a="28978584" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2024 12:20:05 -0700 X-CSE-ConnectionGUID: Uw9zXQwJRrCbITFLq/lkCg== X-CSE-MsgGUID: XM5x6YgQQXGmvdzD5tPLNA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,217,1725346800"; d="scan'208";a="84212396" Received: from lstrano-desk.jf.intel.com ([10.54.39.91]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Oct 2024 12:20:05 -0700 From: Matthew Brost To: intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: matthew.auld@intel.com, thomas.hellstrom@linux.intel.com Subject: [PATCH v3 1/6] drm/ttm: Add ttm_bo_access Date: Sat, 19 Oct 2024 12:20:25 -0700 Message-Id: <20241019192030.1505020-2-matthew.brost@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241019192030.1505020-1-matthew.brost@intel.com> References: <20241019192030.1505020-1-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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Non-contiguous VRAM cannot easily be mapped in TTM nor can non-visible VRAM easily be accessed. Add ttm_bo_access, which is similar to ttm_bo_vm_access, to access such memory. Reported-by: Christoph Manszewski Suggested-by: Thomas Hellström Signed-off-by: Matthew Brost --- drivers/gpu/drm/ttm/ttm_bo_util.c | 86 +++++++++++++++++++++++++++++++ drivers/gpu/drm/ttm/ttm_bo_vm.c | 65 +---------------------- include/drm/ttm/ttm_bo.h | 2 + 3 files changed, 89 insertions(+), 64 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c index d939925efa81..084d2e9b9123 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_util.c +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c @@ -919,3 +919,89 @@ s64 ttm_lru_walk_for_evict(struct ttm_lru_walk *walk, struct ttm_device *bdev, return progress; } + +static int ttm_bo_access_kmap(struct ttm_buffer_object *bo, + unsigned long offset, + uint8_t *buf, int len, int write) +{ + unsigned long page = offset >> PAGE_SHIFT; + unsigned long bytes_left = len; + int ret; + + /* Copy a page at a time, that way no extra virtual address + * mapping is needed + */ + offset -= page << PAGE_SHIFT; + do { + unsigned long bytes = min(bytes_left, PAGE_SIZE - offset); + struct ttm_bo_kmap_obj map; + void *ptr; + bool is_iomem; + + ret = ttm_bo_kmap(bo, page, 1, &map); + if (ret) + return ret; + + ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset; + WARN_ON_ONCE(is_iomem); + if (write) + memcpy(ptr, buf, bytes); + else + memcpy(buf, ptr, bytes); + ttm_bo_kunmap(&map); + + page++; + buf += bytes; + bytes_left -= bytes; + offset = 0; + } while (bytes_left); + + return len; +} + +/** + * ttm_bo_access - Helper to access a buffer object + * + * @bo: ttm buffer object + * @offset: access offset into buffer object + * @buf: pointer to caller memory to read into or write from + * @len: length of access + * @write: write access + * + * Utility function to access a buffer object. Useful when buffer object cannot + * be easily mapped (non-contiguous, non-visible, etc...). + * + * Returns: + * 0 if successful, negative error code on failure. + */ +int ttm_bo_access(struct ttm_buffer_object *bo, unsigned long offset, + void *buf, int len, int write) +{ + int ret; + + if (len < 1 || (offset + len) > bo->base.size) + return -EIO; + + ret = ttm_bo_reserve(bo, true, false, NULL); + if (ret) + return ret; + + switch (bo->resource->mem_type) { + case TTM_PL_SYSTEM: + fallthrough; + case TTM_PL_TT: + ret = ttm_bo_access_kmap(bo, offset, buf, len, write); + break; + default: + if (bo->bdev->funcs->access_memory) + ret = bo->bdev->funcs->access_memory( + bo, offset, buf, len, write); + else + ret = -EIO; + } + + ttm_bo_unreserve(bo); + + return ret; +} +EXPORT_SYMBOL(ttm_bo_access); diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index 2c699ed1963a..20b1e5f78684 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -366,45 +366,6 @@ void ttm_bo_vm_close(struct vm_area_struct *vma) } EXPORT_SYMBOL(ttm_bo_vm_close); -static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo, - unsigned long offset, - uint8_t *buf, int len, int write) -{ - unsigned long page = offset >> PAGE_SHIFT; - unsigned long bytes_left = len; - int ret; - - /* Copy a page at a time, that way no extra virtual address - * mapping is needed - */ - offset -= page << PAGE_SHIFT; - do { - unsigned long bytes = min(bytes_left, PAGE_SIZE - offset); - struct ttm_bo_kmap_obj map; - void *ptr; - bool is_iomem; - - ret = ttm_bo_kmap(bo, page, 1, &map); - if (ret) - return ret; - - ptr = (uint8_t *)ttm_kmap_obj_virtual(&map, &is_iomem) + offset; - WARN_ON_ONCE(is_iomem); - if (write) - memcpy(ptr, buf, bytes); - else - memcpy(buf, ptr, bytes); - ttm_bo_kunmap(&map); - - page++; - buf += bytes; - bytes_left -= bytes; - offset = 0; - } while (bytes_left); - - return len; -} - int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr, void *buf, int len, int write) { @@ -412,32 +373,8 @@ int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr, unsigned long offset = (addr) - vma->vm_start + ((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node)) << PAGE_SHIFT); - int ret; - - if (len < 1 || (offset + len) > bo->base.size) - return -EIO; - ret = ttm_bo_reserve(bo, true, false, NULL); - if (ret) - return ret; - - switch (bo->resource->mem_type) { - case TTM_PL_SYSTEM: - fallthrough; - case TTM_PL_TT: - ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write); - break; - default: - if (bo->bdev->funcs->access_memory) - ret = bo->bdev->funcs->access_memory( - bo, offset, buf, len, write); - else - ret = -EIO; - } - - ttm_bo_unreserve(bo); - - return ret; + return ttm_bo_access(bo, offset, buf, len, write); } EXPORT_SYMBOL(ttm_bo_vm_access); diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h index 5804408815be..8ea11cd8df39 100644 --- a/include/drm/ttm/ttm_bo.h +++ b/include/drm/ttm/ttm_bo.h @@ -421,6 +421,8 @@ void ttm_bo_unpin(struct ttm_buffer_object *bo); int ttm_bo_evict_first(struct ttm_device *bdev, struct ttm_resource_manager *man, struct ttm_operation_ctx *ctx); +int ttm_bo_access(struct ttm_buffer_object *bo, unsigned long offset, + void *buf, int len, int write); vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo, struct vm_fault *vmf); vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,