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Message-ID: <20200420195130.GQ576963@builder.lan>
Date: Mon, 20 Apr 2020 12:51:30 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Jonathan Marek <jonathan@...ek.ca>
Cc: freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Jordan Crouse <jcrouse@...eaurora.org>,
Stephen Boyd <swboyd@...omium.org>,
Sharat Masetty <smasetty@...eaurora.org>,
"Michael J. Ruhl" <michael.j.ruhl@...el.com>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<linux-arm-msm@...r.kernel.org>,
"open list:DRM DRIVER FOR MSM ADRENO GPU"
<dri-devel@...ts.freedesktop.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/9] Revert "drm/msm/a6xx: Use the DMA API for GMU memory
objects"
On Mon 20 Apr 07:03 PDT 2020, Jonathan Marek wrote:
> This reverts commit a5fb8b918920c6f7706a8b5b8ea535a7f077a7f6.
Why?
> ---
> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 115 +++++++++++++++++++++++---
> drivers/gpu/drm/msm/adreno/a6xx_gmu.h | 6 +-
> 2 files changed, 107 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index c4e71abbdd53..748cd379065f 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -2,7 +2,6 @@
> /* Copyright (c) 2017-2019 The Linux Foundation. All rights reserved. */
>
> #include <linux/clk.h>
> -#include <linux/dma-mapping.h>
> #include <linux/interconnect.h>
> #include <linux/pm_domain.h>
> #include <linux/pm_opp.h>
> @@ -921,10 +920,21 @@ 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;
>
> - dma_free_wc(gmu->dev, bo->size, bo->virt, bo->iova);
> + 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);
> kfree(bo);
> }
>
> @@ -932,6 +942,7 @@ 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)
> @@ -939,14 +950,86 @@ static struct a6xx_gmu_bo *a6xx_gmu_memory_alloc(struct a6xx_gmu *gmu,
>
> bo->size = PAGE_ALIGN(size);
>
> - bo->virt = dma_alloc_wc(gmu->dev, bo->size, &bo->iova, GFP_KERNEL);
> + count = bo->size >> PAGE_SHIFT;
>
> - if (!bo->virt) {
> + bo->pages = kcalloc(count, sizeof(struct page *), GFP_KERNEL);
> + if (!bo->pages) {
> 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 */
> @@ -1206,6 +1289,10 @@ 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);
>
> @@ -1226,15 +1313,7 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
>
> gmu->dev = &pdev->dev;
>
> - /* 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() */
> - ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(31));
> - if (ret)
> - return ret;
> + of_dma_configure(gmu->dev, node, true);
>
> /* Fow now, don't do anything fancy until we get our feet under us */
> gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
> @@ -1246,6 +1325,11 @@ 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))
> @@ -1291,6 +1375,11 @@ 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 4af65a36d5ca..2af91ed7ed0c 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.h
> @@ -12,7 +12,8 @@
> struct a6xx_gmu_bo {
> void *virt;
> size_t size;
> - dma_addr_t iova;
> + u64 iova;
> + struct page **pages;
> };
>
> /*
> @@ -48,6 +49,9 @@ struct a6xx_gmu {
> int hfi_irq;
> int gmu_irq;
>
> + struct iommu_domain *domain;
> + u64 uncached_iova_base;
> +
> struct device *gxpd;
>
> int idle_level;
> --
> 2.26.1
>
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