--- /dev/null
+/*
+ * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/*
+ * GK20A does not have dedicated video memory, and to accurately represent this
+ * fact Nouveau will not create a RAM device for it. Therefore its instmem
+ * implementation must be done directly on top of system memory, while providing
+ * coherent read and write operations.
+ *
+ * Instmem can be allocated through two means:
+ * 1) If an IOMMU mapping has been probed, the IOMMU API is used to make memory
+ * pages contiguous to the GPU. This is the preferred way.
+ * 2) If no IOMMU mapping is probed, the DMA API is used to allocate physically
+ * contiguous memory.
+ *
+ * In both cases CPU read and writes are performed using PRAMIN (i.e. using the
+ * GPU path) to ensure these operations are coherent for the GPU. This allows us
+ * to use more "relaxed" allocation parameters when using the DMA API, since we
+ * never need a kernel mapping.
+ */
+
+#include <subdev/fb.h>
+#include <core/mm.h>
+#include <core/device.h>
+
+#ifdef __KERNEL__
+#include <linux/dma-attrs.h>
+#include <linux/iommu.h>
+#include <nouveau_platform.h>
+#endif
+
+#include "priv.h"
+
+struct gk20a_instobj_priv {
+ struct nvkm_instobj base;
+ /* Must be second member here - see nouveau_gpuobj_map_vm() */
+ struct nvkm_mem *mem;
+ /* Pointed by mem */
+ struct nvkm_mem _mem;
+};
+
+/*
+ * Used for objects allocated using the DMA API
+ */
+struct gk20a_instobj_dma {
+ struct gk20a_instobj_priv base;
+
+ void *cpuaddr;
+ dma_addr_t handle;
+ struct nvkm_mm_node r;
+};
+
+/*
+ * Used for objects flattened using the IOMMU API
+ */
+struct gk20a_instobj_iommu {
+ struct gk20a_instobj_priv base;
+
+ /* array of base.mem->size pages */
+ struct page *pages[];
+};
+
+struct gk20a_instmem_priv {
+ struct nvkm_instmem base;
+ spinlock_t lock;
+ u64 addr;
+
+ /* Only used if IOMMU if present */
+ struct mutex *mm_mutex;
+ struct nvkm_mm *mm;
+ struct iommu_domain *domain;
+ unsigned long iommu_pgshift;
+
+ /* Only used by DMA API */
+ struct dma_attrs attrs;
+};
+
+/*
+ * Use PRAMIN to read/write data and avoid coherency issues.
+ * PRAMIN uses the GPU path and ensures data will always be coherent.
+ *
+ * A dynamic mapping based solution would be desirable in the future, but
+ * the issue remains of how to maintain coherency efficiently. On ARM it is
+ * not easy (if possible at all?) to create uncached temporary mappings.
+ */
+
+static u32
+gk20a_instobj_rd32(struct nvkm_object *object, u64 offset)
+{
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(object);
+ struct gk20a_instobj_priv *node = (void *)object;
+ unsigned long flags;
+ u64 base = (node->mem->offset + offset) & 0xffffff00000ULL;
+ u64 addr = (node->mem->offset + offset) & 0x000000fffffULL;
+ u32 data;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (unlikely(priv->addr != base)) {
+ nv_wr32(priv, 0x001700, base >> 16);
+ priv->addr = base;
+ }
+ data = nv_rd32(priv, 0x700000 + addr);
+ spin_unlock_irqrestore(&priv->lock, flags);
+ return data;
+}
+
+static void
+gk20a_instobj_wr32(struct nvkm_object *object, u64 offset, u32 data)
+{
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(object);
+ struct gk20a_instobj_priv *node = (void *)object;
+ unsigned long flags;
+ u64 base = (node->mem->offset + offset) & 0xffffff00000ULL;
+ u64 addr = (node->mem->offset + offset) & 0x000000fffffULL;
+
+ spin_lock_irqsave(&priv->lock, flags);
+ if (unlikely(priv->addr != base)) {
+ nv_wr32(priv, 0x001700, base >> 16);
+ priv->addr = base;
+ }
+ nv_wr32(priv, 0x700000 + addr, data);
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void
+gk20a_instobj_dtor_dma(struct gk20a_instobj_priv *_node)
+{
+ struct gk20a_instobj_dma *node = (void *)_node;
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(node);
+ struct device *dev = nv_device_base(nv_device(priv));
+
+ if (unlikely(!node->cpuaddr))
+ return;
+
+ dma_free_attrs(dev, _node->mem->size << PAGE_SHIFT, node->cpuaddr,
+ node->handle, &priv->attrs);
+}
+
+static void
+gk20a_instobj_dtor_iommu(struct gk20a_instobj_priv *_node)
+{
+ struct gk20a_instobj_iommu *node = (void *)_node;
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(node);
+ struct nvkm_mm_node *r;
+ int i;
+
+ if (unlikely(list_empty(&_node->mem->regions)))
+ return;
+
+ r = list_first_entry(&_node->mem->regions, struct nvkm_mm_node,
+ rl_entry);
+
+ /* clear bit 34 to unmap pages */
+ r->offset &= ~BIT(34 - priv->iommu_pgshift);
+
+ /* Unmap pages from GPU address space and free them */
+ for (i = 0; i < _node->mem->size; i++) {
+ iommu_unmap(priv->domain,
+ (r->offset + i) << priv->iommu_pgshift, PAGE_SIZE);
+ __free_page(node->pages[i]);
+ }
+
+ /* Release area from GPU address space */
+ mutex_lock(priv->mm_mutex);
+ nvkm_mm_free(priv->mm, &r);
+ mutex_unlock(priv->mm_mutex);
+}
+
+static void
+gk20a_instobj_dtor(struct nvkm_object *object)
+{
+ struct gk20a_instobj_priv *node = (void *)object;
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(node);
+
+ if (priv->domain)
+ gk20a_instobj_dtor_iommu(node);
+ else
+ gk20a_instobj_dtor_dma(node);
+
+ nvkm_instobj_destroy(&node->base);
+}
+
+static int
+gk20a_instobj_ctor_dma(struct nvkm_object *parent, struct nvkm_object *engine,
+ struct nvkm_oclass *oclass, u32 npages, u32 align,
+ struct gk20a_instobj_priv **_node)
+{
+ struct gk20a_instobj_dma *node;
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(parent);
+ struct device *dev = nv_device_base(nv_device(parent));
+ int ret;
+
+ ret = nvkm_instobj_create_(parent, engine, oclass, sizeof(*node),
+ (void **)&node);
+ *_node = &node->base;
+ if (ret)
+ return ret;
+
+ node->cpuaddr = dma_alloc_attrs(dev, npages << PAGE_SHIFT,
+ &node->handle, GFP_KERNEL,
+ &priv->attrs);
+ if (!node->cpuaddr) {
+ nv_error(priv, "cannot allocate DMA memory\n");
+ return -ENOMEM;
+ }
+
+ /* alignment check */
+ if (unlikely(node->handle & (align - 1)))
+ nv_warn(priv, "memory not aligned as requested: %pad (0x%x)\n",
+ &node->handle, align);
+
+ /* present memory for being mapped using small pages */
+ node->r.type = 12;
+ node->r.offset = node->handle >> 12;
+ node->r.length = (npages << PAGE_SHIFT) >> 12;
+
+ node->base._mem.offset = node->handle;
+
+ INIT_LIST_HEAD(&node->base._mem.regions);
+ list_add_tail(&node->r.rl_entry, &node->base._mem.regions);
+
+ return 0;
+}
+
+static int
+gk20a_instobj_ctor_iommu(struct nvkm_object *parent, struct nvkm_object *engine,
+ struct nvkm_oclass *oclass, u32 npages, u32 align,
+ struct gk20a_instobj_priv **_node)
+{
+ struct gk20a_instobj_iommu *node;
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(parent);
+ struct nvkm_mm_node *r;
+ int ret;
+ int i;
+
+ ret = nvkm_instobj_create_(parent, engine, oclass,
+ sizeof(*node) + sizeof(node->pages[0]) * npages,
+ (void **)&node);
+ *_node = &node->base;
+ if (ret)
+ return ret;
+
+ /* Allocate backing memory */
+ for (i = 0; i < npages; i++) {
+ struct page *p = alloc_page(GFP_KERNEL);
+
+ if (p == NULL) {
+ ret = -ENOMEM;
+ goto free_pages;
+ }
+ node->pages[i] = p;
+ }
+
+ mutex_lock(priv->mm_mutex);
+ /* Reserve area from GPU address space */
+ ret = nvkm_mm_head(priv->mm, 0, 1, npages, npages,
+ align >> priv->iommu_pgshift, &r);
+ mutex_unlock(priv->mm_mutex);
+ if (ret) {
+ nv_error(priv, "virtual space is full!\n");
+ goto free_pages;
+ }
+
+ /* Map into GPU address space */
+ for (i = 0; i < npages; i++) {
+ struct page *p = node->pages[i];
+ u32 offset = (r->offset + i) << priv->iommu_pgshift;
+
+ ret = iommu_map(priv->domain, offset, page_to_phys(p),
+ PAGE_SIZE, IOMMU_READ | IOMMU_WRITE);
+ if (ret < 0) {
+ nv_error(priv, "IOMMU mapping failure: %d\n", ret);
+
+ while (i-- > 0) {
+ offset -= PAGE_SIZE;
+ iommu_unmap(priv->domain, offset, PAGE_SIZE);
+ }
+ goto release_area;
+ }
+ }
+
+ /* Bit 34 tells that an address is to be resolved through the IOMMU */
+ r->offset |= BIT(34 - priv->iommu_pgshift);
+
+ node->base._mem.offset = ((u64)r->offset) << priv->iommu_pgshift;
+
+ INIT_LIST_HEAD(&node->base._mem.regions);
+ list_add_tail(&r->rl_entry, &node->base._mem.regions);
+
+ return 0;
+
+release_area:
+ mutex_lock(priv->mm_mutex);
+ nvkm_mm_free(priv->mm, &r);
+ mutex_unlock(priv->mm_mutex);
+
+free_pages:
+ for (i = 0; i < npages && node->pages[i] != NULL; i++)
+ __free_page(node->pages[i]);
+
+ return ret;
+}
+
+static int
+gk20a_instobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
+ struct nvkm_oclass *oclass, void *data, u32 _size,
+ struct nvkm_object **pobject)
+{
+ struct nvkm_instobj_args *args = data;
+ struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(parent);
+ struct gk20a_instobj_priv *node;
+ u32 size, align;
+ int ret;
+
+ nv_debug(parent, "%s (%s): size: %x align: %x\n", __func__,
+ priv->domain ? "IOMMU" : "DMA", args->size, args->align);
+
+ /* Round size and align to page bounds */
+ size = max(roundup(args->size, PAGE_SIZE), PAGE_SIZE);
+ align = max(roundup(args->align, PAGE_SIZE), PAGE_SIZE);
+
+ if (priv->domain)
+ ret = gk20a_instobj_ctor_iommu(parent, engine, oclass,
+ size >> PAGE_SHIFT, align, &node);
+ else
+ ret = gk20a_instobj_ctor_dma(parent, engine, oclass,
+ size >> PAGE_SHIFT, align, &node);
+ *pobject = nv_object(node);
+ if (ret)
+ return ret;
+
+ node->mem = &node->_mem;
+
+ /* present memory for being mapped using small pages */
+ node->mem->size = size >> 12;
+ node->mem->memtype = 0;
+ node->mem->page_shift = 12;
+
+ node->base.addr = node->mem->offset;
+ node->base.size = size;
+
+ nv_debug(parent, "alloc size: 0x%x, align: 0x%x, gaddr: 0x%llx\n",
+ size, align, node->mem->offset);
+
+ return 0;
+}
+
+static struct nvkm_instobj_impl
+gk20a_instobj_oclass = {
+ .base.ofuncs = &(struct nvkm_ofuncs) {
+ .ctor = gk20a_instobj_ctor,
+ .dtor = gk20a_instobj_dtor,
+ .init = _nvkm_instobj_init,
+ .fini = _nvkm_instobj_fini,
+ .rd32 = gk20a_instobj_rd32,
+ .wr32 = gk20a_instobj_wr32,
+ },
+};
+
+
+
+static int
+gk20a_instmem_fini(struct nvkm_object *object, bool suspend)
+{
+ struct gk20a_instmem_priv *priv = (void *)object;
+ priv->addr = ~0ULL;
+ return nvkm_instmem_fini(&priv->base, suspend);
+}
+
+static int
+gk20a_instmem_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
+ struct nvkm_oclass *oclass, void *data, u32 size,
+ struct nvkm_object **pobject)
+{
+ struct gk20a_instmem_priv *priv;
+ struct nouveau_platform_device *plat;
+ int ret;
+
+ ret = nvkm_instmem_create(parent, engine, oclass, &priv);
+ *pobject = nv_object(priv);
+ if (ret)
+ return ret;
+
+ spin_lock_init(&priv->lock);
+
+ plat = nv_device_to_platform(nv_device(parent));
+ if (plat->gpu->iommu.domain) {
+ priv->domain = plat->gpu->iommu.domain;
+ priv->mm = plat->gpu->iommu.mm;
+ priv->iommu_pgshift = plat->gpu->iommu.pgshift;
+ priv->mm_mutex = &plat->gpu->iommu.mutex;
+
+ nv_info(priv, "using IOMMU\n");
+ } else {
+ init_dma_attrs(&priv->attrs);
+ /*
+ * We will access instmem through PRAMIN and thus do not need a
+ * consistent CPU pointer or kernel mapping
+ */
+ dma_set_attr(DMA_ATTR_NON_CONSISTENT, &priv->attrs);
+ dma_set_attr(DMA_ATTR_WEAK_ORDERING, &priv->attrs);
+ dma_set_attr(DMA_ATTR_WRITE_COMBINE, &priv->attrs);
+ dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &priv->attrs);
+
+ nv_info(priv, "using DMA API\n");
+ }
+
+ return 0;
+}
+
+struct nvkm_oclass *
+gk20a_instmem_oclass = &(struct nvkm_instmem_impl) {
+ .base.handle = NV_SUBDEV(INSTMEM, 0xea),
+ .base.ofuncs = &(struct nvkm_ofuncs) {
+ .ctor = gk20a_instmem_ctor,
+ .dtor = _nvkm_instmem_dtor,
+ .init = _nvkm_instmem_init,
+ .fini = gk20a_instmem_fini,
+ },
+ .instobj = &gk20a_instobj_oclass.base,
+}.base;
Code Review / kvmfornfv.git / blobdiff