heap buffer is used as output of GP and input of PP for Mali Utgard GPU. Size of heap buffer depends on the task so is a runtime variable.
Previously we just create a large enough buffer as heap buffer. Now we add a heap buffer type to be able to increase the backup memory dynamically when GP fail due to lack of heap memory.
Signed-off-by: Qiang Yu yuq825@gmail.com --- drivers/gpu/drm/lima/lima_drv.c | 6 +- drivers/gpu/drm/lima/lima_drv.h | 1 + drivers/gpu/drm/lima/lima_gem.c | 130 ++++++++++++++++++++++++++++++-- drivers/gpu/drm/lima/lima_gem.h | 4 + drivers/gpu/drm/lima/lima_vm.c | 4 +- include/uapi/drm/lima_drm.h | 9 ++- 6 files changed, 143 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/lima/lima_drv.c b/drivers/gpu/drm/lima/lima_drv.c index 124efe4fa97b..18f88aaef1a2 100644 --- a/drivers/gpu/drm/lima/lima_drv.c +++ b/drivers/gpu/drm/lima/lima_drv.c @@ -15,10 +15,14 @@ #include "lima_vm.h"
int lima_sched_timeout_ms; +uint lima_heap_init_nr_pages = 8;
MODULE_PARM_DESC(sched_timeout_ms, "task run timeout in ms"); module_param_named(sched_timeout_ms, lima_sched_timeout_ms, int, 0444);
+MODULE_PARM_DESC(heap_init_nr_pages, "heap buffer init number of pages"); +module_param_named(heap_init_nr_pages, lima_heap_init_nr_pages, uint, 0444); + static int lima_ioctl_get_param(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_lima_get_param *args = data; @@ -68,7 +72,7 @@ static int lima_ioctl_gem_create(struct drm_device *dev, void *data, struct drm_ if (args->pad) return -EINVAL;
- if (args->flags) + if (args->flags & ~(LIMA_BO_FLAG_HEAP)) return -EINVAL;
if (args->size == 0) diff --git a/drivers/gpu/drm/lima/lima_drv.h b/drivers/gpu/drm/lima/lima_drv.h index 69c7344715c9..f492ecc6a5d9 100644 --- a/drivers/gpu/drm/lima/lima_drv.h +++ b/drivers/gpu/drm/lima/lima_drv.h @@ -9,6 +9,7 @@ #include "lima_ctx.h"
extern int lima_sched_timeout_ms; +extern uint lima_heap_init_nr_pages;
struct lima_vm; struct lima_bo; diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c index d0059d8c97d8..24e1a086d5fe 100644 --- a/drivers/gpu/drm/lima/lima_gem.c +++ b/drivers/gpu/drm/lima/lima_gem.c @@ -4,6 +4,8 @@ #include <linux/mm.h> #include <linux/sync_file.h> #include <linux/pagemap.h> +#include <linux/shmem_fs.h> +#include <linux/dma-mapping.h>
#include <drm/drm_file.h> #include <drm/drm_syncobj.h> @@ -15,6 +17,80 @@ #include "lima_gem.h" #include "lima_vm.h"
+int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm) +{ + struct page **pages; + struct address_space *mapping = bo->base.base.filp->f_mapping; + struct device *dev = bo->base.base.dev->dev; + size_t old_size = bo->heap_size; + size_t new_size = bo->heap_size ? bo->heap_size * 2 : + (lima_heap_init_nr_pages << PAGE_SHIFT); + struct sg_table sgt; + int i, ret; + + if (bo->heap_size >= bo->base.base.size) + return -ENOSPC; + + new_size = min(new_size, bo->base.base.size); + + mutex_lock(&bo->base.pages_lock); + + if (bo->base.pages) + pages = bo->base.pages; + else { + pages = kvmalloc_array(bo->base.base.size >> PAGE_SHIFT, + sizeof(*pages), GFP_KERNEL | __GFP_ZERO); + if (!pages) { + mutex_unlock(&bo->base.pages_lock); + return -ENOMEM; + } + + bo->base.pages = pages; + bo->base.pages_use_count = 1; + + mapping_set_unevictable(mapping); + } + + for (i = old_size >> PAGE_SHIFT; i < new_size >> PAGE_SHIFT; i++) { + struct page *page = shmem_read_mapping_page(mapping, i); + if (IS_ERR(page)) { + mutex_unlock(&bo->base.pages_lock); + return PTR_ERR(page); + } + pages[i] = page; + } + + mutex_unlock(&bo->base.pages_lock); + + ret = sg_alloc_table_from_pages(&sgt, pages, i, 0, new_size, GFP_KERNEL); + if (ret) + return ret; + + if (bo->base.sgt) { + dma_unmap_sg(dev, bo->base.sgt->sgl, bo->base.sgt->nents, DMA_BIDIRECTIONAL); + sg_free_table(bo->base.sgt); + } else { + bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL); + if (!bo->base.sgt) { + sg_free_table(&sgt); + return -ENOMEM; + } + } + + dma_map_sg(dev, sgt.sgl, sgt.nents, DMA_BIDIRECTIONAL); + + *bo->base.sgt = sgt; + + if (vm) { + ret = lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT); + if (ret) + return ret; + } + + bo->heap_size = new_size; + return 0; +} + int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file, u32 size, u32 flags, u32 *handle) { @@ -22,7 +98,8 @@ int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file, gfp_t mask; struct drm_gem_shmem_object *shmem; struct drm_gem_object *obj; - struct sg_table *sgt; + struct lima_bo *bo; + bool is_heap = flags & LIMA_BO_FLAG_HEAP;
shmem = drm_gem_shmem_create(dev, size); if (IS_ERR(shmem)) @@ -36,10 +113,17 @@ int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file, mask |= __GFP_DMA32; mapping_set_gfp_mask(obj->filp->f_mapping, mask);
- sgt = drm_gem_shmem_get_pages_sgt(obj); - if (IS_ERR(sgt)) { - err = PTR_ERR(sgt); - goto out; + if (is_heap) { + bo = to_lima_bo(obj); + err = lima_heap_alloc(bo, NULL); + if (err) + goto out; + } else { + struct sg_table *sgt = drm_gem_shmem_get_pages_sgt(obj); + if (IS_ERR(sgt)) { + err = PTR_ERR(sgt); + goto out; + } }
err = drm_gem_handle_create(file, obj, handle); @@ -79,17 +163,47 @@ static void lima_gem_object_close(struct drm_gem_object *obj, struct drm_file *f lima_vm_bo_del(vm, bo); }
+static int lima_gem_pin(struct drm_gem_object *obj) +{ + struct lima_bo *bo = to_lima_bo(obj); + + if (bo->heap_size) + return -EINVAL; + + return drm_gem_shmem_pin(obj); +} + +static void *lima_gem_vmap(struct drm_gem_object *obj) +{ + struct lima_bo *bo = to_lima_bo(obj); + + if (bo->heap_size) + return ERR_PTR(-EINVAL); + + return drm_gem_shmem_vmap(obj); +} + +static int lima_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) +{ + struct lima_bo *bo = to_lima_bo(obj); + + if (bo->heap_size) + return -EINVAL; + + return drm_gem_shmem_mmap(obj, vma); +} + static const struct drm_gem_object_funcs lima_gem_funcs = { .free = lima_gem_free_object, .open = lima_gem_object_open, .close = lima_gem_object_close, .print_info = drm_gem_shmem_print_info, - .pin = drm_gem_shmem_pin, + .pin = lima_gem_pin, .unpin = drm_gem_shmem_unpin, .get_sg_table = drm_gem_shmem_get_sg_table, - .vmap = drm_gem_shmem_vmap, + .vmap = lima_gem_vmap, .vunmap = drm_gem_shmem_vunmap, - .mmap = drm_gem_shmem_mmap, + .mmap = lima_gem_mmap, };
struct drm_gem_object *lima_gem_create_object(struct drm_device *dev, size_t size) diff --git a/drivers/gpu/drm/lima/lima_gem.h b/drivers/gpu/drm/lima/lima_gem.h index 1800feb3e47f..ccea06142f4b 100644 --- a/drivers/gpu/drm/lima/lima_gem.h +++ b/drivers/gpu/drm/lima/lima_gem.h @@ -7,12 +7,15 @@ #include <drm/drm_gem_shmem_helper.h>
struct lima_submit; +struct lima_vm;
struct lima_bo { struct drm_gem_shmem_object base;
struct mutex lock; struct list_head va; + + size_t heap_size; };
static inline struct lima_bo * @@ -31,6 +34,7 @@ static inline struct dma_resv *lima_bo_resv(struct lima_bo *bo) return bo->base.base.resv; }
+int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm); struct drm_gem_object *lima_gem_create_object(struct drm_device *dev, size_t size); int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file, u32 size, u32 flags, u32 *handle); diff --git a/drivers/gpu/drm/lima/lima_vm.c b/drivers/gpu/drm/lima/lima_vm.c index d46f2a69ab42..dff97502ca36 100644 --- a/drivers/gpu/drm/lima/lima_vm.c +++ b/drivers/gpu/drm/lima/lima_vm.c @@ -155,6 +155,7 @@ int lima_vm_bo_add(struct lima_vm *vm, struct lima_bo *bo, bool create) void lima_vm_bo_del(struct lima_vm *vm, struct lima_bo *bo) { struct lima_bo_va *bo_va; + u32 size;
mutex_lock(&bo->lock);
@@ -166,8 +167,9 @@ void lima_vm_bo_del(struct lima_vm *vm, struct lima_bo *bo)
mutex_lock(&vm->lock);
+ size = bo->heap_size ? bo->heap_size : bo_va->node.size; lima_vm_unmap_range(vm, bo_va->node.start, - bo_va->node.start + bo_va->node.size - 1); + bo_va->node.start + size - 1);
drm_mm_remove_node(&bo_va->node);
diff --git a/include/uapi/drm/lima_drm.h b/include/uapi/drm/lima_drm.h index 95a00fb867e6..1ec58d652a5a 100644 --- a/include/uapi/drm/lima_drm.h +++ b/include/uapi/drm/lima_drm.h @@ -32,12 +32,19 @@ struct drm_lima_get_param { __u64 value; /* out, parameter value */ };
+/* + * heap buffer dynamically increase backup memory size when GP task fail + * due to lack of heap memory. size field of heap buffer is an up bound of + * the backup memory which can be set to a fairly large value. + */ +#define LIMA_BO_FLAG_HEAP (1 << 0) + /** * create a buffer for used by GPU */ struct drm_lima_gem_create { __u32 size; /* in, buffer size */ - __u32 flags; /* in, currently no flags, must be zero */ + __u32 flags; /* in, buffer flags */ __u32 handle; /* out, GEM buffer handle */ __u32 pad; /* pad, must be zero */ };