* 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 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)
{
}
static void
-gk20a_instobj_dtor(struct nvkm_object *object)
+gk20a_instobj_dtor_dma(struct gk20a_instobj_priv *_node)
{
- struct gk20a_instobj_priv *node = (void *)object;
+ 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->handle))
return;
- dma_free_attrs(dev, node->mem->size << PAGE_SHIFT, node->cpuaddr,
+ 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(struct nvkm_object *parent, struct nvkm_object *engine,
- struct nvkm_oclass *oclass, void *data, u32 _size,
- struct nvkm_object **pobject)
+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 nvkm_instobj_args *args = data;
+ struct gk20a_instobj_dma *node;
struct gk20a_instmem_priv *priv = (void *)nvkm_instmem(parent);
- struct device *dev = nv_device_base(nv_device(priv));
- struct gk20a_instobj_priv *node;
- u32 size, align;
- u32 npages;
+ struct device *dev = nv_device_base(nv_device(parent));
int ret;
- nv_debug(parent, "%s: size: %x align: %x\n", __func__,
- args->size, args->align);
-
- size = max((args->size + 4095) & ~4095, (u32)4096);
- align = max((args->align + 4095) & ~4095, (u32)4096);
-
- npages = size >> PAGE_SHIFT;
-
ret = nvkm_instobj_create_(parent, engine, oclass, sizeof(*node),
- (void **)&node);
- *pobject = nv_object(node);
+ (void **)&node);
+ *_node = &node->base;
if (ret)
return ret;
- node->mem = &node->_mem;
-
node->cpuaddr = dma_alloc_attrs(dev, npages << PAGE_SHIFT,
&node->handle, GFP_KERNEL,
&priv->attrs);
nv_warn(priv, "memory not aligned as requested: %pad (0x%x)\n",
&node->handle, align);
- node->mem->offset = node->handle;
+ /* 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;
- INIT_LIST_HEAD(&node->mem->regions);
-
- node->r.type = 12;
- node->r.offset = node->handle >> 12;
- node->r.length = npages;
- list_add_tail(&node->r.rl_entry, &node->mem->regions);
node->base.addr = node->mem->offset;
node->base.size = 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);
spin_lock_init(&priv->lock);
- 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);
+ 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;
}
projects / linux-2.6-microblaze.git / commitdiff