Re: [PATCH v6 2/9] drm/hisilicon/hibmc: Add video memory management

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On Fri, Oct 28, 2016 at 3:27 AM, Rongrong Zou <zourongrong@xxxxxxxxx> wrote:
> Hibmc have 32m video memory which can be accessed through PCIe by host,
> we use ttm to manage these memory.
>
> Signed-off-by: Rongrong Zou <zourongrong@xxxxxxxxx>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/Kconfig         |   1 +
>  drivers/gpu/drm/hisilicon/hibmc/Makefile        |   2 +-
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c |  12 +
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h |  46 +++
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c     | 490 ++++++++++++++++++++++++
>  5 files changed, 550 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
>
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/Kconfig b/drivers/gpu/drm/hisilicon/hibmc/Kconfig
> index a9af90d..bcb8c18 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/Kconfig
> +++ b/drivers/gpu/drm/hisilicon/hibmc/Kconfig
> @@ -1,6 +1,7 @@
>  config DRM_HISI_HIBMC
>         tristate "DRM Support for Hisilicon Hibmc"
>         depends on DRM && PCI
> +       select DRM_TTM
>
>         help
>           Choose this option if you have a Hisilicon Hibmc soc chipset.
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
> index 97cf4a0..d5c40b8 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/Makefile
> +++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile
> @@ -1,5 +1,5 @@
>  ccflags-y := -Iinclude/drm
> -hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_power.o
> +hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_power.o hibmc_ttm.o
>
>  obj-$(CONFIG_DRM_HISI_HIBMC)   +=hibmc-drm.o
>  #obj-y += hibmc-drm.o
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> index 4669d42..81f4301 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c
> @@ -31,6 +31,7 @@
>  #ifdef CONFIG_COMPAT
>         .compat_ioctl   = drm_compat_ioctl,
>  #endif
> +       .mmap           = hibmc_mmap,
>         .poll           = drm_poll,
>         .read           = drm_read,
>         .llseek         = no_llseek,
> @@ -46,6 +47,8 @@ static void hibmc_disable_vblank(struct drm_device *dev, unsigned int pipe)
>  }
>
>  static struct drm_driver hibmc_driver = {
> +       .driver_features        = DRIVER_GEM,
> +

nit: extra space

>         .fops                   = &hibmc_fops,
>         .name                   = "hibmc",
>         .date                   = "20160828",
> @@ -55,6 +58,10 @@ static void hibmc_disable_vblank(struct drm_device *dev, unsigned int pipe)
>         .get_vblank_counter     = drm_vblank_no_hw_counter,
>         .enable_vblank          = hibmc_enable_vblank,
>         .disable_vblank         = hibmc_disable_vblank,
> +       .gem_free_object_unlocked = hibmc_gem_free_object,
> +       .dumb_create            = hibmc_dumb_create,
> +       .dumb_map_offset        = hibmc_dumb_mmap_offset,
> +       .dumb_destroy           = drm_gem_dumb_destroy,
>  };
>
>  static int hibmc_pm_suspend(struct device *dev)
> @@ -163,6 +170,7 @@ static int hibmc_unload(struct drm_device *dev)
>  {
>         struct hibmc_drm_device *hidev = dev->dev_private;
>
> +       hibmc_mm_fini(hidev);
>         hibmc_hw_fini(hidev);
>         dev->dev_private = NULL;
>         return 0;
> @@ -183,6 +191,10 @@ static int hibmc_load(struct drm_device *dev, unsigned long flags)
>         if (ret)
>                 goto err;
>
> +       ret = hibmc_mm_init(hidev);
> +       if (ret)
> +               goto err;
> +
>         return 0;
>
>  err:
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> index 0037341..db8d80e 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h
> @@ -20,6 +20,8 @@
>  #define HIBMC_DRM_DRV_H
>
>  #include <drm/drmP.h>
> +#include <drm/ttm/ttm_bo_driver.h>
> +#include <drm/drm_gem.h>

nit: alphabetize

>
>  struct hibmc_drm_device {
>         /* hw */
> @@ -30,6 +32,50 @@ struct hibmc_drm_device {
>
>         /* drm */
>         struct drm_device  *dev;
> +
> +       /* ttm */
> +       struct {
> +               struct drm_global_reference mem_global_ref;
> +               struct ttm_bo_global_ref bo_global_ref;
> +               struct ttm_bo_device bdev;
> +               bool initialized;
> +       } ttm;

I don't think you gain anything other than keystrokes from the substruct

> +
> +       bool mm_inited;
>  };
>
> +struct hibmc_bo {
> +       struct ttm_buffer_object bo;
> +       struct ttm_placement placement;
> +       struct ttm_bo_kmap_obj kmap;
> +       struct drm_gem_object gem;
> +       struct ttm_place placements[3];
> +       int pin_count;
> +};
> +
> +static inline struct hibmc_bo *hibmc_bo(struct ttm_buffer_object *bo)
> +{
> +       return container_of(bo, struct hibmc_bo, bo);
> +}
> +
> +static inline struct hibmc_bo *gem_to_hibmc_bo(struct drm_gem_object *gem)
> +{
> +       return container_of(gem, struct hibmc_bo, gem);
> +}
> +
> +#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)

Hide this in ttm.c

> +
> +int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
> +                    struct drm_gem_object **obj);
> +
> +int hibmc_mm_init(struct hibmc_drm_device *hibmc);
> +void hibmc_mm_fini(struct hibmc_drm_device *hibmc);
> +int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr);
> +void hibmc_gem_free_object(struct drm_gem_object *obj);
> +int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
> +                     struct drm_mode_create_dumb *args);
> +int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
> +                          u32 handle, u64 *offset);
> +int hibmc_mmap(struct file *filp, struct vm_area_struct *vma);
> +
>  #endif
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> new file mode 100644
> index 0000000..0802ebd
> --- /dev/null
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
> @@ -0,0 +1,490 @@
> +/* Hisilicon Hibmc SoC drm driver
> + *
> + * Based on the bochs drm driver.
> + *
> + * Copyright (c) 2016 Huawei Limited.
> + *
> + * Author:
> + *     Rongrong Zou <zourongrong@xxxxxxxxxx>
> + *     Rongrong Zou <zourongrong@xxxxxxxxx>
> + *     Jianhua Li <lijianhua@xxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + */
> +
> +#include "hibmc_drm_drv.h"
> +#include <ttm/ttm_page_alloc.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +
> +static inline struct hibmc_drm_device *
> +hibmc_bdev(struct ttm_bo_device *bd)
> +{
> +       return container_of(bd, struct hibmc_drm_device, ttm.bdev);
> +}
> +
> +static int
> +hibmc_ttm_mem_global_init(struct drm_global_reference *ref)
> +{
> +       return ttm_mem_global_init(ref->object);
> +}
> +
> +static void
> +hibmc_ttm_mem_global_release(struct drm_global_reference *ref)
> +{
> +       ttm_mem_global_release(ref->object);
> +}
> +
> +static int hibmc_ttm_global_init(struct hibmc_drm_device *hibmc)
> +{
> +       struct drm_global_reference *global_ref;
> +       int r;

nit: try not to use one character variable names unless it's for the
purpose of a loop (ie: i,j). You also use ret elsewhere in the driver,
so it'd be nice to remain consistent

> +
> +       global_ref = &hibmc->ttm.mem_global_ref;

I think using the global_ref local obfuscates what you're doing here.
It saves you 6 characters while typing, but adds a layer of
indirection for all future readers.

> +       global_ref->global_type = DRM_GLOBAL_TTM_MEM;
> +       global_ref->size = sizeof(struct ttm_mem_global);
> +       global_ref->init = &hibmc_ttm_mem_global_init;
> +       global_ref->release = &hibmc_ttm_mem_global_release;
> +       r = drm_global_item_ref(global_ref);
> +       if (r != 0) {

nit: if (r)

> +               DRM_ERROR("Failed setting up TTM memory accounting subsystem.\n"
> +                        );

Breaking up the line for one character is probably not worthwhile, and
you should really print the error. How about:

DRM_ERROR("Could not get ref on ttm global ret=%d.\n", ret);


> +               return r;
> +       }
> +
> +       hibmc->ttm.bo_global_ref.mem_glob =
> +               hibmc->ttm.mem_global_ref.object;
> +       global_ref = &hibmc->ttm.bo_global_ref.ref;
> +       global_ref->global_type = DRM_GLOBAL_TTM_BO;
> +       global_ref->size = sizeof(struct ttm_bo_global);
> +       global_ref->init = &ttm_bo_global_init;
> +       global_ref->release = &ttm_bo_global_release;
> +       r = drm_global_item_ref(global_ref);
> +       if (r != 0) {
> +               DRM_ERROR("Failed setting up TTM BO subsystem.\n");
> +               drm_global_item_unref(&hibmc->ttm.mem_global_ref);
> +               return r;
> +       }
> +       return 0;
> +}
> +
> +static void
> +hibmc_ttm_global_release(struct hibmc_drm_device *hibmc)
> +{
> +       if (!hibmc->ttm.mem_global_ref.release)

Are you actually hitting this condition? This seems like it's papering
over something else.

> +               return;
> +
> +       drm_global_item_unref(&hibmc->ttm.bo_global_ref.ref);
> +       drm_global_item_unref(&hibmc->ttm.mem_global_ref);
> +       hibmc->ttm.mem_global_ref.release = NULL;
> +}
> +
> +static void hibmc_bo_ttm_destroy(struct ttm_buffer_object *tbo)
> +{
> +       struct hibmc_bo *bo;
> +
> +       bo = container_of(tbo, struct hibmc_bo, bo);

nit: No need to split this into a separate line.

> +
> +       drm_gem_object_release(&bo->gem);
> +       kfree(bo);
> +}
> +
> +static bool hibmc_ttm_bo_is_hibmc_bo(struct ttm_buffer_object *bo)
> +{
> +       if (bo->destroy == &hibmc_bo_ttm_destroy)
> +               return true;
> +       return false;

return bo->destroy == &hibmc_bo_ttm_destroy;

> +}
> +
> +static int
> +hibmc_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
> +                      struct ttm_mem_type_manager *man)
> +{
> +       switch (type) {
> +       case TTM_PL_SYSTEM:
> +               man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
> +               man->available_caching = TTM_PL_MASK_CACHING;
> +               man->default_caching = TTM_PL_FLAG_CACHED;
> +               break;
> +       case TTM_PL_VRAM:
> +               man->func = &ttm_bo_manager_func;
> +               man->flags = TTM_MEMTYPE_FLAG_FIXED |
> +                       TTM_MEMTYPE_FLAG_MAPPABLE;
> +               man->available_caching = TTM_PL_FLAG_UNCACHED |
> +                       TTM_PL_FLAG_WC;
> +               man->default_caching = TTM_PL_FLAG_WC;
> +               break;
> +       default:
> +               DRM_ERROR("Unsupported memory type %u\n", type);
> +               return -EINVAL;
> +       }
> +       return 0;
> +}
> +
> +void hibmc_ttm_placement(struct hibmc_bo *bo, int domain)
> +{
> +       u32 c = 0;

Can you please use a more descriptive name than 'c'?

> +       u32 i;
> +
> +       bo->placement.placement = bo->placements;
> +       bo->placement.busy_placement = bo->placements;
> +       if (domain & TTM_PL_FLAG_VRAM)
> +               bo->placements[c++].flags = TTM_PL_FLAG_WC |
> +               TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;

nit: you're alignment is off here and below

> +       if (domain & TTM_PL_FLAG_SYSTEM)
> +               bo->placements[c++].flags = TTM_PL_MASK_CACHING |
> +               TTM_PL_FLAG_SYSTEM;
> +       if (!c)
> +               bo->placements[c++].flags = TTM_PL_MASK_CACHING |
> +               TTM_PL_FLAG_SYSTEM;
> +
> +       bo->placement.num_placement = c;
> +       bo->placement.num_busy_placement = c;
> +       for (i = 0; i < c; ++i) {

nit: we tend towards post-increment in kernel

> +               bo->placements[i].fpfn = 0;
> +               bo->placements[i].lpfn = 0;
> +       }
> +}
> +
> +static void
> +hibmc_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
> +{
> +       struct hibmc_bo *hibmcbo = hibmc_bo(bo);
> +
> +       if (!hibmc_ttm_bo_is_hibmc_bo(bo))
> +               return;
> +
> +       hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_SYSTEM);
> +       *pl = hibmcbo->placement;
> +}
> +
> +static int hibmc_bo_verify_access(struct ttm_buffer_object *bo,
> +                                 struct file *filp)
> +{
> +       struct hibmc_bo *hibmcbo = hibmc_bo(bo);
> +
> +       return drm_vma_node_verify_access(&hibmcbo->gem.vma_node,
> +                                         filp->private_data);
> +}
> +
> +static int hibmc_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
> +                                   struct ttm_mem_reg *mem)
> +{
> +       struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
> +       struct hibmc_drm_device *hibmc = hibmc_bdev(bdev);
> +
> +       mem->bus.addr = NULL;
> +       mem->bus.offset = 0;
> +       mem->bus.size = mem->num_pages << PAGE_SHIFT;
> +       mem->bus.base = 0;
> +       mem->bus.is_iomem = false;
> +       if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
> +               return -EINVAL;
> +       switch (mem->mem_type) {
> +       case TTM_PL_SYSTEM:
> +               /* system memory */
> +               return 0;
> +       case TTM_PL_VRAM:
> +               mem->bus.offset = mem->start << PAGE_SHIFT;
> +               mem->bus.base = pci_resource_start(hibmc->dev->pdev, 0);
> +               mem->bus.is_iomem = true;
> +               break;
> +       default:
> +               return -EINVAL;
> +       }
> +       return 0;
> +}
> +
> +static void hibmc_ttm_io_mem_free(struct ttm_bo_device *bdev,
> +                                 struct ttm_mem_reg *mem)
> +{
> +}

No need to stub this, the caller does a NULL-check before invoking

> +
> +static void hibmc_ttm_backend_destroy(struct ttm_tt *tt)
> +{
> +       ttm_tt_fini(tt);
> +       kfree(tt);
> +}
> +
> +static struct ttm_backend_func hibmc_tt_backend_func = {
> +       .destroy = &hibmc_ttm_backend_destroy,
> +};
> +
> +static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
> +                                         unsigned long size,
> +                                         u32 page_flags,
> +                                         struct page *dummy_read_page)
> +{
> +       struct ttm_tt *tt;
> +
> +       tt = kzalloc(sizeof(*tt), GFP_KERNEL);
> +       if (!tt)

Print error

> +               return NULL;
> +       tt->func = &hibmc_tt_backend_func;
> +       if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {

Here too?

> +               kfree(tt);
> +               return NULL;
> +       }
> +       return tt;
> +}
> +
> +static int hibmc_ttm_tt_populate(struct ttm_tt *ttm)
> +{
> +       return ttm_pool_populate(ttm);
> +}
> +
> +static void hibmc_ttm_tt_unpopulate(struct ttm_tt *ttm)
> +{
> +       ttm_pool_unpopulate(ttm);
> +}
> +
> +struct ttm_bo_driver hibmc_bo_driver = {
> +       .ttm_tt_create          = hibmc_ttm_tt_create,
> +       .ttm_tt_populate        = hibmc_ttm_tt_populate,
> +       .ttm_tt_unpopulate      = hibmc_ttm_tt_unpopulate,
> +       .init_mem_type          = hibmc_bo_init_mem_type,
> +       .evict_flags            = hibmc_bo_evict_flags,
> +       .move                   = NULL,
> +       .verify_access          = hibmc_bo_verify_access,
> +       .io_mem_reserve         = &hibmc_ttm_io_mem_reserve,
> +       .io_mem_free            = &hibmc_ttm_io_mem_free,
> +       .lru_tail               = &ttm_bo_default_lru_tail,
> +       .swap_lru_tail          = &ttm_bo_default_swap_lru_tail,
> +};
> +
> +int hibmc_mm_init(struct hibmc_drm_device *hibmc)
> +{
> +       int ret;
> +       struct drm_device *dev = hibmc->dev;
> +       struct ttm_bo_device *bdev = &hibmc->ttm.bdev;
> +
> +       ret = hibmc_ttm_global_init(hibmc);
> +       if (ret)
> +               return ret;
> +
> +       ret = ttm_bo_device_init(&hibmc->ttm.bdev,
> +                                hibmc->ttm.bo_global_ref.ref.object,
> +                                &hibmc_bo_driver,
> +                                dev->anon_inode->i_mapping,
> +                                DRM_FILE_PAGE_OFFSET,
> +                                true);
> +       if (ret) {

Call hibmc_ttm_global_release here?

> +               DRM_ERROR("Error initialising bo driver; %d\n", ret);
> +               return ret;
> +       }
> +
> +       ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
> +                            hibmc->fb_size >> PAGE_SHIFT);
> +       if (ret) {

Clean up here as well?

> +               DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
> +               return ret;
> +       }
> +
> +       hibmc->mm_inited = true;
> +       return 0;
> +}
> +
> +void hibmc_mm_fini(struct hibmc_drm_device *hibmc)
> +{
> +       if (!hibmc->mm_inited)
> +               return;
> +
> +       ttm_bo_device_release(&hibmc->ttm.bdev);
> +       hibmc_ttm_global_release(hibmc);
> +       hibmc->mm_inited = false;
> +}
> +
> +int hibmc_bo_create(struct drm_device *dev, int size, int align,
> +                   u32 flags, struct hibmc_bo **phibmcbo)
> +{
> +       struct hibmc_drm_device *hibmc = dev->dev_private;
> +       struct hibmc_bo *hibmcbo;
> +       size_t acc_size;
> +       int ret;
> +
> +       hibmcbo = kzalloc(sizeof(*hibmcbo), GFP_KERNEL);
> +       if (!hibmcbo)
> +               return -ENOMEM;
> +
> +       ret = drm_gem_object_init(dev, &hibmcbo->gem, size);
> +       if (ret) {
> +               kfree(hibmcbo);
> +               return ret;
> +       }
> +
> +       hibmcbo->bo.bdev = &hibmc->ttm.bdev;
> +
> +       hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
> +
> +       acc_size = ttm_bo_dma_acc_size(&hibmc->ttm.bdev, size,
> +                                      sizeof(struct hibmc_bo));
> +
> +       ret = ttm_bo_init(&hibmc->ttm.bdev, &hibmcbo->bo, size,
> +                         ttm_bo_type_device, &hibmcbo->placement,
> +                         align >> PAGE_SHIFT, false, NULL, acc_size,
> +                         NULL, NULL, hibmc_bo_ttm_destroy);
> +       if (ret)

Missing hibmcbo clean up here

> +               return ret;
> +
> +       *phibmcbo = hibmcbo;
> +       return 0;
> +}
> +
> +static inline u64 hibmc_bo_gpu_offset(struct hibmc_bo *bo)
> +{
> +       return bo->bo.offset;
> +}

I don't think this function provides any value

> +
> +int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr)
> +{
> +       int i, ret;
> +
> +       if (bo->pin_count) {
> +               bo->pin_count++;
> +               if (gpu_addr)
> +                       *gpu_addr = hibmc_bo_gpu_offset(bo);

Are you missing a return here?

> +       }
> +
> +       hibmc_ttm_placement(bo, pl_flag);
> +       for (i = 0; i < bo->placement.num_placement; i++)
> +               bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
> +       ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
> +       if (ret)
> +               return ret;
> +
> +       bo->pin_count = 1;
> +       if (gpu_addr)
> +               *gpu_addr = hibmc_bo_gpu_offset(bo);
> +       return 0;
> +}
> +
> +int hibmc_bo_push_sysram(struct hibmc_bo *bo)
> +{
> +       int i, ret;
> +
> +       if (!bo->pin_count) {
> +               DRM_ERROR("unpin bad %p\n", bo);
> +               return 0;
> +       }
> +       bo->pin_count--;
> +       if (bo->pin_count)
> +               return 0;
> +
> +       if (bo->kmap.virtual)

ttm_bo_kunmap already does this check so you don't have to

> +               ttm_bo_kunmap(&bo->kmap);
> +
> +       hibmc_ttm_placement(bo, TTM_PL_FLAG_SYSTEM);
> +       for (i = 0; i < bo->placement.num_placement ; i++)
> +               bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
> +
> +       ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
> +       if (ret) {
> +               DRM_ERROR("pushing to VRAM failed\n");

Print ret

> +               return ret;
> +       }
> +       return 0;
> +}
> +
> +int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
> +{
> +       struct drm_file *file_priv;
> +       struct hibmc_drm_device *hibmc;
> +
> +       if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
> +               return -EINVAL;
> +
> +       file_priv = filp->private_data;
> +       hibmc = file_priv->minor->dev->dev_private;
> +       return ttm_bo_mmap(filp, vma, &hibmc->ttm.bdev);
> +}
> +
> +int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
> +                    struct drm_gem_object **obj)
> +{
> +       struct hibmc_bo *hibmcbo;
> +       int ret;
> +
> +       *obj = NULL;
> +
> +       size = PAGE_ALIGN(size);
> +       if (size == 0)

Print error

> +               return -EINVAL;
> +
> +       ret = hibmc_bo_create(dev, size, 0, 0, &hibmcbo);
> +       if (ret) {
> +               if (ret != -ERESTARTSYS)
> +                       DRM_ERROR("failed to allocate GEM object\n");

Print ret

> +               return ret;
> +       }
> +       *obj = &hibmcbo->gem;
> +       return 0;
> +}
> +
> +int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
> +                     struct drm_mode_create_dumb *args)
> +{
> +       struct drm_gem_object *gobj;
> +       u32 handle;
> +       int ret;
> +
> +       args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 16);

What's up with the bpp + 7 here? Perhaps you're looking for DIV_ROUND_UP?


> +       args->size = args->pitch * args->height;
> +
> +       ret = hibmc_gem_create(dev, args->size, false,
> +                              &gobj);
> +       if (ret)
> +               return ret;
> +
> +       ret = drm_gem_handle_create(file, gobj, &handle);
> +       drm_gem_object_unreference_unlocked(gobj);
> +       if (ret)

Print error here

> +               return ret;
> +
> +       args->handle = handle;
> +       return 0;
> +}
> +
> +static void hibmc_bo_unref(struct hibmc_bo **bo)
> +{
> +       struct ttm_buffer_object *tbo;
> +
> +       if ((*bo) == NULL)
> +               return;
> +
> +       tbo = &((*bo)->bo);
> +       ttm_bo_unref(&tbo);
> +       *bo = NULL;
> +}
> +
> +void hibmc_gem_free_object(struct drm_gem_object *obj)
> +{
> +       struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj);
> +
> +       hibmc_bo_unref(&hibmcbo);
> +}
> +
> +static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo)
> +{
> +       return drm_vma_node_offset_addr(&bo->bo.vma_node);
> +}
> +
> +int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
> +                          u32 handle, u64 *offset)
> +{
> +       struct drm_gem_object *obj;
> +       struct hibmc_bo *bo;
> +
> +       obj = drm_gem_object_lookup(file, handle);
> +       if (!obj)
> +               return -ENOENT;
> +
> +       bo = gem_to_hibmc_bo(obj);
> +       *offset = hibmc_bo_mmap_offset(bo);
> +
> +       drm_gem_object_unreference_unlocked(obj);
> +       return 0;
> +}
> --
> 1.9.1
>
>
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