1 files changed, 393 insertions, 0 deletions
diff --git a/sys/dev/pci/drm/amd/amdgpu/amdgpu_gart.c b/sys/dev/pci/drm/amd/amdgpu/amdgpu_gart.c
new file mode 100644
index 00000000000..762a51193f1
--- /dev/null
+++ b/sys/dev/pci/drm/amd/amdgpu/amdgpu_gart.c
@@ -0,0 +1,393 @@
+/*
+ * Copyright 2008 Advanced Micro Devices, Inc.
+ * Copyright 2008 Red Hat Inc.
+ * Copyright 2009 Jerome Glisse.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ *          Alex Deucher
+ *          Jerome Glisse
+ */
+#include <drm/drmP.h>
+#include <drm/amdgpu_drm.h>
+#ifdef CONFIG_X86
+#include <asm/set_memory.h>
+#endif
+#include "amdgpu.h"
+
+/*
+ * GART
+ * The GART (Graphics Aperture Remapping Table) is an aperture
+ * in the GPU's address space.  System pages can be mapped into
+ * the aperture and look like contiguous pages from the GPU's
+ * perspective.  A page table maps the pages in the aperture
+ * to the actual backing pages in system memory.
+ *
+ * Radeon GPUs support both an internal GART, as described above,
+ * and AGP.  AGP works similarly, but the GART table is configured
+ * and maintained by the northbridge rather than the driver.
+ * Radeon hw has a separate AGP aperture that is programmed to
+ * point to the AGP aperture provided by the northbridge and the
+ * requests are passed through to the northbridge aperture.
+ * Both AGP and internal GART can be used at the same time, however
+ * that is not currently supported by the driver.
+ *
+ * This file handles the common internal GART management.
+ */
+
+/*
+ * Common GART table functions.
+ */
+
+/**
+ * amdgpu_dummy_page_init - init dummy page used by the driver
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Allocate the dummy page used by the driver (all asics).
+ * This dummy page is used by the driver as a filler for gart entries
+ * when pages are taken out of the GART
+ * Returns 0 on sucess, -ENOMEM on failure.
+ */
+static int amdgpu_gart_dummy_page_init(struct amdgpu_device *adev)
+{
+	struct vm_page *dummy_page = adev->mman.bdev.glob->dummy_read_page;
+
+	if (adev->dummy_page_addr)
+		return 0;
+	adev->dummy_page_addr = pci_map_page(adev->pdev, dummy_page, 0,
+					     PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+	if (pci_dma_mapping_error(adev->pdev, adev->dummy_page_addr)) {
+		dev_err(&adev->pdev->dev, "Failed to DMA MAP the dummy page\n");
+		adev->dummy_page_addr = 0;
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+/**
+ * amdgpu_dummy_page_fini - free dummy page used by the driver
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Frees the dummy page used by the driver (all asics).
+ */
+static void amdgpu_gart_dummy_page_fini(struct amdgpu_device *adev)
+{
+	if (!adev->dummy_page_addr)
+		return;
+	pci_unmap_page(adev->pdev, adev->dummy_page_addr,
+		       PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+	adev->dummy_page_addr = 0;
+}
+
+/**
+ * amdgpu_gart_table_vram_alloc - allocate vram for gart page table
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Allocate video memory for GART page table
+ * (pcie r4xx, r5xx+).  These asics require the
+ * gart table to be in video memory.
+ * Returns 0 for success, error for failure.
+ */
+int amdgpu_gart_table_vram_alloc(struct amdgpu_device *adev)
+{
+	int r;
+
+	if (adev->gart.robj == NULL) {
+		struct amdgpu_bo_param bp;
+
+		memset(&bp, 0, sizeof(bp));
+		bp.size = adev->gart.table_size;
+		bp.byte_align = PAGE_SIZE;
+		bp.domain = AMDGPU_GEM_DOMAIN_VRAM;
+		bp.flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
+			AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS;
+		bp.type = ttm_bo_type_kernel;
+		bp.resv = NULL;
+		r = amdgpu_bo_create(adev, &bp, &adev->gart.robj);
+		if (r) {
+			return r;
+		}
+	}
+	return 0;
+}
+
+/**
+ * amdgpu_gart_table_vram_pin - pin gart page table in vram
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Pin the GART page table in vram so it will not be moved
+ * by the memory manager (pcie r4xx, r5xx+).  These asics require the
+ * gart table to be in video memory.
+ * Returns 0 for success, error for failure.
+ */
+int amdgpu_gart_table_vram_pin(struct amdgpu_device *adev)
+{
+	int r;
+
+	r = amdgpu_bo_reserve(adev->gart.robj, false);
+	if (unlikely(r != 0))
+		return r;
+	r = amdgpu_bo_pin(adev->gart.robj, AMDGPU_GEM_DOMAIN_VRAM);
+	if (r) {
+		amdgpu_bo_unreserve(adev->gart.robj);
+		return r;
+	}
+	r = amdgpu_bo_kmap(adev->gart.robj, &adev->gart.ptr);
+	if (r)
+		amdgpu_bo_unpin(adev->gart.robj);
+	amdgpu_bo_unreserve(adev->gart.robj);
+	adev->gart.table_addr = amdgpu_bo_gpu_offset(adev->gart.robj);
+	return r;
+}
+
+/**
+ * amdgpu_gart_table_vram_unpin - unpin gart page table in vram
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Unpin the GART page table in vram (pcie r4xx, r5xx+).
+ * These asics require the gart table to be in video memory.
+ */
+void amdgpu_gart_table_vram_unpin(struct amdgpu_device *adev)
+{
+	int r;
+
+	if (adev->gart.robj == NULL) {
+		return;
+	}
+	r = amdgpu_bo_reserve(adev->gart.robj, true);
+	if (likely(r == 0)) {
+		amdgpu_bo_kunmap(adev->gart.robj);
+		amdgpu_bo_unpin(adev->gart.robj);
+		amdgpu_bo_unreserve(adev->gart.robj);
+		adev->gart.ptr = NULL;
+	}
+}
+
+/**
+ * amdgpu_gart_table_vram_free - free gart page table vram
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Free the video memory used for the GART page table
+ * (pcie r4xx, r5xx+).  These asics require the gart table to
+ * be in video memory.
+ */
+void amdgpu_gart_table_vram_free(struct amdgpu_device *adev)
+{
+	if (adev->gart.robj == NULL) {
+		return;
+	}
+	amdgpu_bo_unref(&adev->gart.robj);
+}
+
+/*
+ * Common gart functions.
+ */
+/**
+ * amdgpu_gart_unbind - unbind pages from the gart page table
+ *
+ * @adev: amdgpu_device pointer
+ * @offset: offset into the GPU's gart aperture
+ * @pages: number of pages to unbind
+ *
+ * Unbinds the requested pages from the gart page table and
+ * replaces them with the dummy page (all asics).
+ * Returns 0 for success, -EINVAL for failure.
+ */
+int amdgpu_gart_unbind(struct amdgpu_device *adev, uint64_t offset,
+			int pages)
+{
+	unsigned t;
+	unsigned p;
+	int i, j;
+	u64 page_base;
+	/* Starting from VEGA10, system bit must be 0 to mean invalid. */
+	uint64_t flags = 0;
+
+	if (!adev->gart.ready) {
+		WARN(1, "trying to unbind memory from uninitialized GART !\n");
+		return -EINVAL;
+	}
+
+	t = offset / AMDGPU_GPU_PAGE_SIZE;
+	p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
+	for (i = 0; i < pages; i++, p++) {
+#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
+		adev->gart.pages[p] = NULL;
+#endif
+		page_base = adev->dummy_page_addr;
+		if (!adev->gart.ptr)
+			continue;
+
+		for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
+			amdgpu_gmc_set_pte_pde(adev, adev->gart.ptr,
+					       t, page_base, flags);
+			page_base += AMDGPU_GPU_PAGE_SIZE;
+		}
+	}
+	mb();
+	amdgpu_asic_flush_hdp(adev, NULL);
+	amdgpu_gmc_flush_gpu_tlb(adev, 0);
+	return 0;
+}
+
+/**
+ * amdgpu_gart_map - map dma_addresses into GART entries
+ *
+ * @adev: amdgpu_device pointer
+ * @offset: offset into the GPU's gart aperture
+ * @pages: number of pages to bind
+ * @dma_addr: DMA addresses of pages
+ *
+ * Map the dma_addresses into GART entries (all asics).
+ * Returns 0 for success, -EINVAL for failure.
+ */
+int amdgpu_gart_map(struct amdgpu_device *adev, uint64_t offset,
+		    int pages, dma_addr_t *dma_addr, uint64_t flags,
+		    void *dst)
+{
+	uint64_t page_base;
+	unsigned i, j, t;
+
+	if (!adev->gart.ready) {
+		WARN(1, "trying to bind memory to uninitialized GART !\n");
+		return -EINVAL;
+	}
+
+	t = offset / AMDGPU_GPU_PAGE_SIZE;
+
+	for (i = 0; i < pages; i++) {
+		page_base = dma_addr[i];
+		for (j = 0; j < AMDGPU_GPU_PAGES_IN_CPU_PAGE; j++, t++) {
+			amdgpu_gmc_set_pte_pde(adev, dst, t, page_base, flags);
+			page_base += AMDGPU_GPU_PAGE_SIZE;
+		}
+	}
+	return 0;
+}
+
+/**
+ * amdgpu_gart_bind - bind pages into the gart page table
+ *
+ * @adev: amdgpu_device pointer
+ * @offset: offset into the GPU's gart aperture
+ * @pages: number of pages to bind
+ * @pagelist: pages to bind
+ * @dma_addr: DMA addresses of pages
+ *
+ * Binds the requested pages to the gart page table
+ * (all asics).
+ * Returns 0 for success, -EINVAL for failure.
+ */
+int amdgpu_gart_bind(struct amdgpu_device *adev, uint64_t offset,
+		     int pages, struct vm_page **pagelist, dma_addr_t *dma_addr,
+		     uint64_t flags)
+{
+#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
+	unsigned i,t,p;
+#endif
+	int r;
+
+	if (!adev->gart.ready) {
+		WARN(1, "trying to bind memory to uninitialized GART !\n");
+		return -EINVAL;
+	}
+
+#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
+	t = offset / AMDGPU_GPU_PAGE_SIZE;
+	p = t / AMDGPU_GPU_PAGES_IN_CPU_PAGE;
+	for (i = 0; i < pages; i++, p++)
+		adev->gart.pages[p] = pagelist ? pagelist[i] : NULL;
+#endif
+
+	if (!adev->gart.ptr)
+		return 0;
+
+	r = amdgpu_gart_map(adev, offset, pages, dma_addr, flags,
+		    adev->gart.ptr);
+	if (r)
+		return r;
+
+	mb();
+	amdgpu_asic_flush_hdp(adev, NULL);
+	amdgpu_gmc_flush_gpu_tlb(adev, 0);
+	return 0;
+}
+
+/**
+ * amdgpu_gart_init - init the driver info for managing the gart
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Allocate the dummy page and init the gart driver info (all asics).
+ * Returns 0 for success, error for failure.
+ */
+int amdgpu_gart_init(struct amdgpu_device *adev)
+{
+	int r;
+
+	if (adev->dummy_page_addr)
+		return 0;
+
+	/* We need PAGE_SIZE >= AMDGPU_GPU_PAGE_SIZE */
+	if (PAGE_SIZE < AMDGPU_GPU_PAGE_SIZE) {
+		DRM_ERROR("Page size is smaller than GPU page size!\n");
+		return -EINVAL;
+	}
+	r = amdgpu_gart_dummy_page_init(adev);
+	if (r)
+		return r;
+	/* Compute table size */
+	adev->gart.num_cpu_pages = adev->gmc.gart_size / PAGE_SIZE;
+	adev->gart.num_gpu_pages = adev->gmc.gart_size / AMDGPU_GPU_PAGE_SIZE;
+	DRM_INFO("GART: num cpu pages %u, num gpu pages %u\n",
+		 adev->gart.num_cpu_pages, adev->gart.num_gpu_pages);
+
+#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
+	/* Allocate pages table */
+	adev->gart.pages = vzalloc(array_size(sizeof(void *),
+					      adev->gart.num_cpu_pages));
+	if (adev->gart.pages == NULL)
+		return -ENOMEM;
+#endif
+
+	return 0;
+}
+
+/**
+ * amdgpu_gart_fini - tear down the driver info for managing the gart
+ *
+ * @adev: amdgpu_device pointer
+ *
+ * Tear down the gart driver info and free the dummy page (all asics).
+ */
+void amdgpu_gart_fini(struct amdgpu_device *adev)
+{
+#ifdef CONFIG_DRM_AMDGPU_GART_DEBUGFS
+	vfree(adev->gart.pages);
+	adev->gart.pages = NULL;
+#endif
+	amdgpu_gart_dummy_page_fini(adev);
+}