From patchwork Mon Mar 2 20:47:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jordan Crouse X-Patchwork-Id: 11416355 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 533B7921 for ; Mon, 2 Mar 2020 20:48:07 +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 3005421556 for ; Mon, 2 Mar 2020 20:48:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="OSKCvgXV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3005421556 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=codeaurora.org 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 D51766E841; Mon, 2 Mar 2020 20:48:05 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail26.static.mailgun.info (mail26.static.mailgun.info [104.130.122.26]) by gabe.freedesktop.org (Postfix) with ESMTPS id 36C536E841 for ; Mon, 2 Mar 2020 20:48:02 +0000 (UTC) DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1583182084; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=aZKmrawApP8TGQomcBYB3rAYj/s33zDvIpYeppo/fKA=; b=OSKCvgXVYZxG26U2B4T2Lp200MDPQ+7NyS5REtuI0dlvahcacn+UhCyPEcR7eo7Ls+wJnRkR xwcFqMp7eKaW7ZabwbkqXcTRskBLXBeUiK7tTz8c0U73UKop3e9wuFSZ3y/4vdG4UnBCxEgw WD1tOK4jYdCvxc7NFpOGQtM7FaU= X-Mailgun-Sending-Ip: 104.130.122.26 X-Mailgun-Sid: WyJkOTU5ZSIsICJkcmktZGV2ZWxAbGlzdHMuZnJlZWRlc2t0b3Aub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by mxa.mailgun.org with ESMTP id 5e5d70fd.7fc4603676c0-smtp-out-n03; Mon, 02 Mar 2020 20:47:57 -0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 17A7CC4479F; Mon, 2 Mar 2020 20:47:57 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from jcrouse1-lnx.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: jcrouse) by smtp.codeaurora.org (Postfix) with ESMTPSA id 62B9DC433A2; Mon, 2 Mar 2020 20:47:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 62B9DC433A2 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=jcrouse@codeaurora.org From: Jordan Crouse To: linux-arm-msm@vger.kernel.org Subject: [PATCH v4 2/2] drm/msm/a6xx: Use the DMA API for GMU memory objects Date: Mon, 2 Mar 2020 13:47:47 -0700 Message-Id: <1583182067-16530-3-git-send-email-jcrouse@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1583182067-16530-1-git-send-email-jcrouse@codeaurora.org> References: <1583182067-16530-1-git-send-email-jcrouse@codeaurora.org> 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: Douglas Anderson , David Airlie , freedreno@lists.freedesktop.org, smasetty@codeaurora.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Stephen Boyd , "Michael J. Ruhl" , Sean Paul MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The GMU has very few memory allocations and uses a flat memory space so there is no good reason to go out of our way to bypass the DMA APIs which were basically designed for this exact scenario. v4: Use dma_alloc_wc() v3: Set the dma mask correctly and use dma_addr_t for the iova type v2: Pass force_dma false to of_dma_configure to require that the DMA region be set up and return error from of_dma_configure to fail probe. Signed-off-by: Jordan Crouse Reviewed-by: Michael J. Ruhl --- drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 113 ++++------------------------------ drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 6 +- 2 files changed, 12 insertions(+), 107 deletions(-) diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c index 748cd37..dd51dd0 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c @@ -2,6 +2,7 @@ /* Copyright (c) 2017-2019 The Linux Foundation. All rights reserved. */ #include +#include #include #include #include @@ -920,21 +921,10 @@ int a6xx_gmu_stop(struct a6xx_gpu *a6xx_gpu) static void a6xx_gmu_memory_free(struct a6xx_gmu *gmu, struct a6xx_gmu_bo *bo) { - int count, i; - u64 iova; - if (IS_ERR_OR_NULL(bo)) return; - count = bo->size >> PAGE_SHIFT; - iova = bo->iova; - - for (i = 0; i < count; i++, iova += PAGE_SIZE) { - iommu_unmap(gmu->domain, iova, PAGE_SIZE); - __free_pages(bo->pages[i], 0); - } - - kfree(bo->pages); + dma_free_wc(gmu->dev, bo->size, bo->virt, bo->iova); kfree(bo); } @@ -942,7 +932,6 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu, size_t size) { struct a6xx_gmu_bo *bo; - int ret, count, i; bo = kzalloc(sizeof(*bo), GFP_KERNEL); if (!bo) @@ -950,86 +939,14 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu, bo->size = PAGE_ALIGN(size); - count = bo->size >> PAGE_SHIFT; + bo->virt = dma_alloc_wc(gmu->dev, bo->size, &bo->iova, GFP_KERNEL); - bo->pages = kcalloc(count, sizeof(struct page *), GFP_KERNEL); - if (!bo->pages) { + if (!bo->virt) { kfree(bo); return ERR_PTR(-ENOMEM); } - for (i = 0; i < count; i++) { - bo->pages[i] = alloc_page(GFP_KERNEL); - if (!bo->pages[i]) - goto err; - } - - bo->iova = gmu->uncached_iova_base; - - for (i = 0; i < count; i++) { - ret = iommu_map(gmu->domain, - bo->iova + (PAGE_SIZE * i), - page_to_phys(bo->pages[i]), PAGE_SIZE, - IOMMU_READ | IOMMU_WRITE); - - if (ret) { - DRM_DEV_ERROR(gmu->dev, "Unable to map GMU buffer object\n"); - - for (i = i - 1 ; i >= 0; i--) - iommu_unmap(gmu->domain, - bo->iova + (PAGE_SIZE * i), - PAGE_SIZE); - - goto err; - } - } - - bo->virt = vmap(bo->pages, count, VM_IOREMAP, - pgprot_writecombine(PAGE_KERNEL)); - if (!bo->virt) - goto err; - - /* Align future IOVA addresses on 1MB boundaries */ - gmu->uncached_iova_base += ALIGN(size, SZ_1M); - return bo; - -err: - for (i = 0; i < count; i++) { - if (bo->pages[i]) - __free_pages(bo->pages[i], 0); - } - - kfree(bo->pages); - kfree(bo); - - return ERR_PTR(-ENOMEM); -} - -static int a6xx_gmu_memory_probe(struct a6xx_gmu *gmu) -{ - int ret; - - /* - * The GMU address space is hardcoded to treat the range - * 0x60000000 - 0x80000000 as un-cached memory. All buffers shared - * between the GMU and the CPU will live in this space - */ - gmu->uncached_iova_base = 0x60000000; - - - gmu->domain = iommu_domain_alloc(&platform_bus_type); - if (!gmu->domain) - return -ENODEV; - - ret = iommu_attach_device(gmu->domain, gmu->dev); - - if (ret) { - iommu_domain_free(gmu->domain); - gmu->domain = NULL; - } - - return ret; } /* Return the 'arc-level' for the given frequency */ @@ -1289,10 +1206,6 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu) a6xx_gmu_memory_free(gmu, gmu->hfi); - iommu_detach_device(gmu->domain, gmu->dev); - - iommu_domain_free(gmu->domain); - free_irq(gmu->gmu_irq, gmu); free_irq(gmu->hfi_irq, gmu); @@ -1313,7 +1226,13 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node) gmu->dev = &pdev->dev; - of_dma_configure(gmu->dev, node, true); + /* Pass force_dma false to require the DT to set the dma region */ + ret = of_dma_configure(gmu->dev, node, false); + if (ret) + return ret; + + /* Set the mask after the of_dma_configure() */ + dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(31)); /* Fow now, don't do anything fancy until we get our feet under us */ gmu->idle_level = GMU_IDLE_STATE_ACTIVE; @@ -1325,11 +1244,6 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node) if (ret) goto err_put_device; - /* Set up the IOMMU context bank */ - ret = a6xx_gmu_memory_probe(gmu); - if (ret) - goto err_put_device; - /* Allocate memory for for the HFI queues */ gmu->hfi = a6xx_gmu_memory_alloc(gmu, SZ_16K); if (IS_ERR(gmu->hfi)) @@ -1375,11 +1289,6 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node) err_memory: a6xx_gmu_memory_free(gmu, gmu->hfi); - if (gmu->domain) { - iommu_detach_device(gmu->domain, gmu->dev); - - iommu_domain_free(gmu->domain); - } ret = -ENODEV; err_put_device: diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h index 2af91ed..4af65a3 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h @@ -12,8 +12,7 @@ struct a6xx_gmu_bo { void *virt; size_t size; - u64 iova; - struct page **pages; + dma_addr_t iova; }; /* @@ -49,9 +48,6 @@ struct a6xx_gmu { int hfi_irq; int gmu_irq; - struct iommu_domain *domain; - u64 uncached_iova_base; - struct device *gxpd; int idle_level;