From d33ea570bd20f7ac7abea4f56f1df299e179356b Mon Sep 17 00:00:00 2001 From: Oak Zeng Date: Thu, 23 May 2019 17:12:41 -0500 Subject: [PATCH] drm/amdkfd: Use kfd fd to mmap mmio TTM doesn't support CPU mapping of sg type bo (under which mmio bo is created). Switch mmaping of mmio page to kfd device file. Signed-off-by: Oak Zeng Acked-by: Christian Konig Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 45 ++++++++++++++++++++++++ drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 1 + 2 files changed, 46 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c index 38ae53fe8182..c92e931ceb27 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -1309,6 +1309,14 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep, args->handle = MAKE_HANDLE(args->gpu_id, idr_handle); args->mmap_offset = offset; + /* MMIO is mapped through kfd device + * Generate a kfd mmap offset + */ + if (flags & KFD_IOC_ALLOC_MEM_FLAGS_MMIO_REMAP) { + args->mmap_offset = KFD_MMAP_TYPE_MMIO | KFD_MMAP_GPU_ID(args->gpu_id); + args->mmap_offset <<= PAGE_SHIFT; + } + return 0; err_free: @@ -1853,6 +1861,39 @@ err_i1: return retcode; } +static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process, + struct vm_area_struct *vma) +{ + phys_addr_t address; + int ret; + + if (vma->vm_end - vma->vm_start != PAGE_SIZE) + return -EINVAL; + + address = amdgpu_amdkfd_get_mmio_remap_phys_addr(dev->kgd); + + vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE | + VM_DONTDUMP | VM_PFNMAP; + + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + + pr_debug("Process %d mapping mmio page\n" + " target user address == 0x%08llX\n" + " physical address == 0x%08llX\n" + " vm_flags == 0x%04lX\n" + " size == 0x%04lX\n", + process->pasid, (unsigned long long) vma->vm_start, + address, vma->vm_flags, PAGE_SIZE); + + ret = io_remap_pfn_range(vma, + vma->vm_start, + address >> PAGE_SHIFT, + PAGE_SIZE, + vma->vm_page_prot); + return ret; +} + + static int kfd_mmap(struct file *filp, struct vm_area_struct *vma) { struct kfd_process *process; @@ -1883,6 +1924,10 @@ static int kfd_mmap(struct file *filp, struct vm_area_struct *vma) if (!dev) return -ENODEV; return kfd_reserved_mem_mmap(dev, process, vma); + case KFD_MMAP_TYPE_MMIO: + if (!dev) + return -ENODEV; + return kfd_mmio_mmap(dev, process, vma); } return -EFAULT; diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index 8f02d7817162..b44ea00ded9d 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -59,6 +59,7 @@ #define KFD_MMAP_TYPE_DOORBELL (0x3ULL << KFD_MMAP_TYPE_SHIFT) #define KFD_MMAP_TYPE_EVENTS (0x2ULL << KFD_MMAP_TYPE_SHIFT) #define KFD_MMAP_TYPE_RESERVED_MEM (0x1ULL << KFD_MMAP_TYPE_SHIFT) +#define KFD_MMAP_TYPE_MMIO (0x0ULL << KFD_MMAP_TYPE_SHIFT) #define KFD_MMAP_GPU_ID_SHIFT (46 - PAGE_SHIFT) #define KFD_MMAP_GPU_ID_MASK (((1ULL << KFD_GPU_ID_HASH_WIDTH) - 1) \ -- 2.30.2