From 8f93e043d048b671c32c6f0a5102fefa800c4618 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 26 Jul 2017 21:59:21 +0200 Subject: [PATCH] drm/msm: gpu: don't abuse dma_alloc for non-DMA allocations In zap_shader_load_mdt(), we pass a pointer to a phys_addr_t into dmam_alloc_coherent, which the compiler warns about: drivers/gpu/drm/msm/adreno/a5xx_gpu.c: In function 'zap_shader_load_mdt': drivers/gpu/drm/msm/adreno/a5xx_gpu.c:54:50: error: passing argument 3 of 'dmam_alloc_coherent' from incompatible pointer type [-Werror=incompatible-pointer-types] The returned DMA address is later passed on to a function that takes a phys_addr_t, so it's clearly wrong to use the DMA mapping interface here: the memory may be uncached, or the address may be completely wrong if there is an IOMMU connected to the device. What the code actually wants to do is to get the physical address from the reserved-mem node. It goes through the dma-mapping interfaces for obscure reasons, and this apparently only works by chance, relying on specific bugs in the error handling of the arm64 dma-mapping implementation. The same problem existed in the "venus" media driver, which was now fixed by Stanimir Varbanov after long discussions. In order to make some progress here, I have now ported his approach over to the adreno driver. The patch is currently untested, and should get a good review, but it is now much simpler than the original, and it should be obvious what goes wrong if I made a mistake in the port. See also: a6e2d36bf6b7 ("media: venus: don't abuse dma_alloc for non-DMA allocations") Cc: Stanimir Varbanov Fixes: 7c65817e6d38 ("drm/msm: gpu: Enable zap shader for A5XX") Acked-by: Bjorn Andersson Acked-and-Tested-by: Jordan Crouse Signed-off-by: Arnd Bergmann Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 72 +++++++++++------------------------ drivers/gpu/drm/msm/adreno/a5xx_gpu.h | 2 - 2 files changed, 23 insertions(+), 51 deletions(-) diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c index a3393e1dc497..f9eae03aa1dc 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c @@ -15,7 +15,7 @@ #include #include #include -#include +#include #include #include "msm_gem.h" #include "msm_mmu.h" @@ -29,6 +29,8 @@ static void a5xx_dump(struct msm_gpu *gpu); static int zap_shader_load_mdt(struct device *dev, const char *fwname) { const struct firmware *fw; + struct device_node *np; + struct resource r; phys_addr_t mem_phys; ssize_t mem_size; void *mem_region = NULL; @@ -37,6 +39,21 @@ static int zap_shader_load_mdt(struct device *dev, const char *fwname) if (!IS_ENABLED(CONFIG_ARCH_QCOM)) return -EINVAL; + np = of_get_child_by_name(dev->of_node, "zap-shader"); + if (!np) + return -ENODEV; + + np = of_parse_phandle(np, "memory-region", 0); + if (!np) + return -EINVAL; + + ret = of_address_to_resource(np, 0, &r); + if (ret) + return ret; + + mem_phys = r.start; + mem_size = resource_size(&r); + /* Request the MDT file for the firmware */ ret = request_firmware(&fw, fwname, dev); if (ret) { @@ -52,7 +69,7 @@ static int zap_shader_load_mdt(struct device *dev, const char *fwname) } /* Allocate memory for the firmware image */ - mem_region = dmam_alloc_coherent(dev, mem_size, &mem_phys, GFP_KERNEL); + mem_region = memremap(mem_phys, mem_size, MEMREMAP_WC); if (!mem_region) { ret = -ENOMEM; goto out; @@ -70,6 +87,9 @@ static int zap_shader_load_mdt(struct device *dev, const char *fwname) DRM_DEV_ERROR(dev, "Unable to authorize the image\n"); out: + if (mem_region) + memunmap(mem_region); + release_firmware(fw); return ret; @@ -348,45 +368,6 @@ static int a5xx_zap_shader_resume(struct msm_gpu *gpu) return ret; } -/* Set up a child device to "own" the zap shader */ -static int a5xx_zap_shader_dev_init(struct device *parent, struct device *dev) -{ - struct device_node *node; - int ret; - - if (dev->parent) - return 0; - - /* Find the sub-node for the zap shader */ - node = of_get_child_by_name(parent->of_node, "zap-shader"); - if (!node) { - DRM_DEV_ERROR(parent, "zap-shader not found in device tree\n"); - return -ENODEV; - } - - dev->parent = parent; - dev->of_node = node; - dev_set_name(dev, "adreno_zap_shader"); - - ret = device_register(dev); - if (ret) { - DRM_DEV_ERROR(parent, "Couldn't register zap shader device\n"); - goto out; - } - - ret = of_reserved_mem_device_init(dev); - if (ret) { - DRM_DEV_ERROR(parent, "Unable to set up the reserved memory\n"); - device_unregister(dev); - } - -out: - if (ret) - dev->parent = NULL; - - return ret; -} - static int a5xx_zap_shader_init(struct msm_gpu *gpu) { static bool loaded; @@ -415,11 +396,7 @@ static int a5xx_zap_shader_init(struct msm_gpu *gpu) return -ENODEV; } - ret = a5xx_zap_shader_dev_init(&pdev->dev, &a5xx_gpu->zap_dev); - - if (!ret) - ret = zap_shader_load_mdt(&a5xx_gpu->zap_dev, - adreno_gpu->info->zapfw); + ret = zap_shader_load_mdt(&pdev->dev, adreno_gpu->info->zapfw); loaded = !ret; @@ -662,9 +639,6 @@ static void a5xx_destroy(struct msm_gpu *gpu) DBG("%s", gpu->name); - if (a5xx_gpu->zap_dev.parent) - device_unregister(&a5xx_gpu->zap_dev); - if (a5xx_gpu->pm4_bo) { if (a5xx_gpu->pm4_iova) msm_gem_put_iova(a5xx_gpu->pm4_bo, gpu->aspace); diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h index d24796f3a706..1137092241d5 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h @@ -36,8 +36,6 @@ struct a5xx_gpu { uint32_t gpmu_dwords; uint32_t lm_leakage; - - struct device zap_dev; }; #define to_a5xx_gpu(x) container_of(x, struct a5xx_gpu, base) -- 2.11.0