Include nvgpu headers

These are needed to build on NVIDIA's Jetson boards for the time
being. Only a couple structs are required, so it should be fairly
easy to remove this dependency at some point in the future.

1 files changed, 348 insertions, 0 deletions

diff --git a/include/os/linux/nvgpu_mem.c b/include/os/linux/nvgpu_mem.c
new file mode 100644
index 0000000..d6a3189
--- /dev/null
+++ b/include/os/linux/nvgpu_mem.c
@@ -0,0 +1,348 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <nvgpu/dma.h>
+#include <nvgpu/gmmu.h>
+#include <nvgpu/nvgpu_mem.h>
+#include <nvgpu/page_allocator.h>
+#include <nvgpu/log.h>
+#include <nvgpu/bug.h>
+#include <nvgpu/enabled.h>
+#include <nvgpu/kmem.h>
+#include <nvgpu/vidmem.h>
+#include <nvgpu/gk20a.h>
+
+#include <nvgpu/linux/dma.h>
+
+#include <linux/vmalloc.h>
+#include <linux/dma-mapping.h>
+
+#include "os_linux.h"
+#include "dmabuf_vidmem.h"
+
+#include "gk20a/mm_gk20a.h"
+#include "platform_gk20a.h"
+
+static u64 __nvgpu_sgl_phys(struct gk20a *g, struct nvgpu_sgl *sgl)
+{
+        struct device *dev = dev_from_gk20a(g);
+        struct gk20a_platform *platform = gk20a_get_platform(dev);
+        u64 ipa = sg_phys((struct scatterlist *)sgl);
+
+        if (platform->phys_addr)
+                return platform->phys_addr(g, ipa);
+
+        return ipa;
+}
+
+/*
+ * Obtain a SYSMEM address from a Linux SGL. This should eventually go away
+ * and/or become private to this file once all bad usages of Linux SGLs are
+ * cleaned up in the driver.
+ */
+u64 nvgpu_mem_get_addr_sgl(struct gk20a *g, struct scatterlist *sgl)
+{
+        if (nvgpu_is_enabled(g, NVGPU_MM_USE_PHYSICAL_SG) ||
+            !nvgpu_iommuable(g))
+                return g->ops.mm.gpu_phys_addr(g, NULL,
+                        __nvgpu_sgl_phys(g, (struct nvgpu_sgl *)sgl));
+
+        if (sg_dma_address(sgl) == 0)
+                return g->ops.mm.gpu_phys_addr(g, NULL,
+                        __nvgpu_sgl_phys(g, (struct nvgpu_sgl *)sgl));
+
+        if (sg_dma_address(sgl) == DMA_ERROR_CODE)
+                return 0;
+
+        return nvgpu_mem_iommu_translate(g, sg_dma_address(sgl));
+}
+
+/*
+ * Obtain the address the GPU should use from the %mem assuming this is a SYSMEM
+ * allocation.
+ */
+static u64 nvgpu_mem_get_addr_sysmem(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        return nvgpu_mem_get_addr_sgl(g, mem->priv.sgt->sgl);
+}
+
+/*
+ * Return the base address of %mem. Handles whether this is a VIDMEM or SYSMEM
+ * allocation.
+ *
+ * Note: this API does not make sense to use for _VIDMEM_ buffers with greater
+ * than one scatterlist chunk. If there's more than one scatterlist chunk then
+ * the buffer will not be contiguous. As such the base address probably isn't
+ * very useful. This is true for SYSMEM as well, if there's no IOMMU.
+ *
+ * However! It _is_ OK to use this on discontiguous sysmem buffers _if_ there's
+ * an IOMMU present and enabled for the GPU.
+ *
+ * %attrs can be NULL. If it is not NULL then it may be inspected to determine
+ * if the address needs to be modified before writing into a PTE.
+ */
+u64 nvgpu_mem_get_addr(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        struct nvgpu_page_alloc *alloc;
+
+        if (mem->aperture == APERTURE_SYSMEM)
+                return nvgpu_mem_get_addr_sysmem(g, mem);
+
+        /*
+         * Otherwise get the vidmem address.
+         */
+        alloc = mem->vidmem_alloc;
+
+        /* This API should not be used with > 1 chunks */
+        WARN_ON(alloc->nr_chunks != 1);
+
+        return alloc->base;
+}
+
+/*
+ * This should only be used on contiguous buffers regardless of whether
+ * there's an IOMMU present/enabled. This applies to both SYSMEM and
+ * VIDMEM.
+ */
+u64 nvgpu_mem_get_phys_addr(struct gk20a *g, struct nvgpu_mem *mem)
+{
+        /*
+         * For a VIDMEM buf, this is identical to simply get_addr() so just fall
+         * back to that.
+         */
+        if (mem->aperture == APERTURE_VIDMEM)
+                return nvgpu_mem_get_addr(g, mem);
+
+        return __nvgpu_sgl_phys(g, (struct nvgpu_sgl *)mem->priv.sgt->sgl);
+}
+
+/*
+ * Be careful how you use this! You are responsible for correctly freeing this
+ * memory.
+ */
+int nvgpu_mem_create_from_mem(struct gk20a *g,
+                              struct nvgpu_mem *dest, struct nvgpu_mem *src,
+                              u64 start_page, int nr_pages)
+{
+        int ret;
+        u64 start = start_page * PAGE_SIZE;
+        u64 size = nr_pages * PAGE_SIZE;
+        dma_addr_t new_iova;
+
+        if (src->aperture != APERTURE_SYSMEM)
+                return -EINVAL;
+
+        /* Some silly things a caller might do... */
+        if (size > src->size)
+                return -EINVAL;
+        if ((start + size) > src->size)
+                return -EINVAL;
+
+        dest->mem_flags = src->mem_flags | NVGPU_MEM_FLAG_SHADOW_COPY;
+        dest->aperture  = src->aperture;
+        dest->skip_wmb  = src->skip_wmb;
+        dest->size      = size;
+
+        /*
+         * Re-use the CPU mapping only if the mapping was made by the DMA API.
+         *
+         * Bug 2040115: the DMA API wrapper makes the mapping that we should
+         * re-use.
+         */
+        if (!(src->priv.flags & NVGPU_DMA_NO_KERNEL_MAPPING) ||
+            nvgpu_is_enabled(g, NVGPU_USE_COHERENT_SYSMEM))
+                dest->cpu_va = src->cpu_va + (PAGE_SIZE * start_page);
+
+        dest->priv.pages = src->priv.pages + start_page;
+        dest->priv.flags = src->priv.flags;
+
+        new_iova = sg_dma_address(src->priv.sgt->sgl) ?
+                sg_dma_address(src->priv.sgt->sgl) + start : 0;
+
+        /*
+         * Make a new SG table that is based only on the subset of pages that
+         * is passed to us. This table gets freed by the dma free routines.
+         */
+        if (src->priv.flags & NVGPU_DMA_NO_KERNEL_MAPPING)
+                ret = nvgpu_get_sgtable_from_pages(g, &dest->priv.sgt,
+                                                   src->priv.pages + start_page,
+                                                   new_iova, size);
+        else
+                ret = nvgpu_get_sgtable(g, &dest->priv.sgt, dest->cpu_va,
+                                        new_iova, size);
+
+        return ret;
+}
+
+int __nvgpu_mem_create_from_pages(struct gk20a *g, struct nvgpu_mem *dest,
+                                  struct page **pages, int nr_pages)
+{
+        struct sg_table *sgt;
+        struct page **our_pages =
+                nvgpu_kmalloc(g, sizeof(struct page *) * nr_pages);
+
+        if (!our_pages)
+                return -ENOMEM;
+
+        memcpy(our_pages, pages, sizeof(struct page *) * nr_pages);
+
+        if (nvgpu_get_sgtable_from_pages(g, &sgt, pages, 0,
+                                         nr_pages * PAGE_SIZE)) {
+                nvgpu_kfree(g, our_pages);
+                return -ENOMEM;
+        }
+
+        /*
+         * If we are making an SGT from physical pages we can be reasonably
+         * certain that this should bypass the SMMU - thus we set the DMA (aka
+         * IOVA) address to 0. This tells the GMMU mapping code to not make a
+         * mapping directed to the SMMU.
+         */
+        sg_dma_address(sgt->sgl) = 0;