Re: [RFC PATCH 2/3] drm/ipvr: drm driver for vxd392

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Hi

> +static struct drm_ioctl_desc ipvr_gem_ioctls[] = {
> +       DRM_IOCTL_DEF_DRV(IPVR_CONTEXT_CREATE,
> +                       ipvr_context_create_ioctl, DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_CONTEXT_DESTROY,
> +                       ipvr_context_destroy_ioctl, DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_MISC,
> +                       ipvr_misc_ioctl, DRM_AUTH),
> +       DRM_IOCTL_DEF_DRV(IPVR_GEM_EXECBUFFER,
> +                       ipvr_gem_execbuffer, DRM_AUTH|DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_GEM_BUSY,
> +                       ipvr_gem_busy_ioctl, DRM_AUTH|DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_GEM_CREATE,
> +                       ipvr_gem_create_ioctl, DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_GEM_MMAP,
> +                       ipvr_gem_mmap_ioctl, DRM_UNLOCKED),

Why do you need this ioctl? mmap() should work perfectly fine. I don't
see why you require people to use a ipvr specific ioctl to map
buffers.

> +       DRM_IOCTL_DEF_DRV(IPVR_SYNC_CPU,
> +                       ipvr_sync_cpu_ioctl, DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_GEM_WAIT,
> +                       ipvr_gem_wait_ioctl, DRM_AUTH|DRM_UNLOCKED),
> +       DRM_IOCTL_DEF_DRV(IPVR_GEM_USERPTR,
> +                       ipvr_gem_userptr_ioctl, DRM_UNLOCKED),
> +};
> +
> +static void ipvr_gem_init(struct drm_device *dev)
> +{
> +       struct drm_ipvr_private *dev_priv = dev->dev_private;
> +
> +       dev_priv->ipvr_bo_slab = kmem_cache_create("ipvr_gem_object",
> +                                 sizeof(union drm_ipvr_gem_objects), 0,
> +                                 SLAB_HWCACHE_ALIGN, NULL);
> +
> +       INIT_LIST_HEAD(&dev_priv->ipvr_mm.unbound_list);
> +       INIT_LIST_HEAD(&dev_priv->ipvr_mm.bound_list);
> +       spin_lock_init(&dev_priv->ipvr_mm.object_stat_lock);
> +
> +       dev_priv->ipvr_mm.interruptible = true;
> +}
> +
> +static void ipvr_gem_setup_mmu(struct drm_device *dev,
> +                                      unsigned long linear_start,
> +                                      unsigned long linear_end,
> +                                      unsigned long tiling_start,
> +                                      unsigned long tiling_end)
> +{
> +       /* Let GEM Manage all of the aperture.
> +        *
> +        * However, leave one page at the end still bound to the scratch page.
> +        * There are a number of places where hardware apparently prefetches
> +        * past the end of the object, and we've seen multiple hangs with the
> +        * GPU head pointer stuck in a batchbuffer bound at last page of the
> +        * aperture.  One page should be enough to keep any prefetching inside
> +        * of the aperture.
> +        */
> +       struct drm_ipvr_private *dev_priv = dev->dev_private;
> +       struct ipvr_address_space *addr_space = &dev_priv->addr_space;
> +
> +       /* todo: add sanity check */
> +       addr_space->dev = dev_priv->dev;
> +       INIT_LIST_HEAD(&addr_space->active_list);
> +       INIT_LIST_HEAD(&addr_space->inactive_list);
> +
> +       /* Subtract the guard page ... */
> +       drm_mm_init(&addr_space->linear_mm, linear_start,
> +                   linear_end - linear_start - PAGE_SIZE);
> +       dev_priv->addr_space.linear_start = linear_start;
> +       dev_priv->addr_space.linear_total = linear_end - linear_start;
> +
> +       drm_mm_init(&addr_space->tiling_mm, tiling_start,
> +                   tiling_end - tiling_start - PAGE_SIZE);
> +       dev_priv->addr_space.tiling_start = tiling_start;
> +       dev_priv->addr_space.tiling_total = tiling_end - tiling_start;
> +}
> +
> +static void ipvr_do_takedown(struct drm_device *dev)
> +{
> +       /* todo: need check if need clean up mm here */
> +       ipvr_ved_uninit(dev);
> +}
> +
> +static int32_t ipvr_drm_unload(struct drm_device *dev)
> +{
> +       struct drm_ipvr_private *dev_priv = dev->dev_private;
> +
> +       BUG_ON(!dev->platformdev);
> +       BUG_ON(atomic_read(&dev_priv->ved_power_usage));
> +
> +       IPVR_DEBUG_ENTRY("entered.");
> +       if (dev_priv) {
> +               WARN_ON(pm_runtime_get_sync(&dev->platformdev->dev) < 0);
> +
> +               if (dev_priv->ipvr_bo_slab)
> +                       kmem_cache_destroy(dev_priv->ipvr_bo_slab);
> +               ipvr_fence_driver_fini(dev_priv);
> +
> +               ipvr_do_takedown(dev);
> +
> +               WARN_ON(pm_runtime_put_sync_suspend(&dev->platformdev->dev) < 0);
> +
> +               if (dev_priv->validate_ctx.buffers)
> +                       vfree(dev_priv->validate_ctx.buffers);
> +
> +               if (dev_priv->pf_pd) {
> +                       ipvr_mmu_free_pagedir(dev_priv->pf_pd);
> +                       dev_priv->pf_pd = NULL;
> +               }
> +               if (dev_priv->mmu) {
> +                       ipvr_mmu_driver_takedown(dev_priv->mmu);
> +                       dev_priv->mmu = NULL;
> +               }
> +
> +               if (dev_priv->ved_reg_base) {
> +                       iounmap(dev_priv->ved_reg_base - dev_priv->ved_reg_offset);
> +                       dev_priv->ved_reg_base = NULL;
> +                       dev_priv->ved_reg_offset = 0;
> +               }
> +
> +               list_del(&dev_priv->default_ctx.head);
> +               idr_remove(&dev_priv->ipvr_ctx_idr, dev_priv->default_ctx.ctx_id);
> +               kfree(dev_priv);
> +
> +       }
> +
> +       pm_runtime_disable(&dev->platformdev->dev);
> +
> +       return 0;
> +}
> +
> +static int32_t ipvr_drm_load(struct drm_device *dev, unsigned long flags)
> +{
> +       struct drm_ipvr_private *dev_priv;
> +       int32_t ctx_id, ret = 0;
> +       struct platform_device *platdev;
> +       struct resource *res_mmio, *res_reg;
> +       void __iomem* mmio_addr;
> +
> +       dev_priv = kzalloc(sizeof(*dev_priv), GFP_KERNEL);
> +       if (dev_priv == NULL)
> +               return -ENOMEM;
> +
> +       dev->dev_private = dev_priv;
> +       dev_priv->dev = dev;
> +
> +       BUG_ON(!dev->platformdev);
> +       platdev = dev->platformdev;
> +
> +       mutex_init(&dev_priv->cmdbuf_mutex);
> +       INIT_LIST_HEAD(&dev_priv->validate_ctx.validate_list);
> +
> +       dev_priv->pci_root = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
> +       if (!dev_priv->pci_root) {
> +               kfree(dev_priv);
> +               return -ENODEV;
> +       }
> +
> +       dev->irq = platform_get_irq(platdev, 0);
> +       if (dev->irq < 0) {
> +               ret = -ENODEV;
> +               goto out_err;
> +       }
> +
> +       res_mmio = platform_get_resource(platdev, IORESOURCE_MEM, 0);
> +       res_reg = platform_get_resource(platdev, IORESOURCE_REG, 0);
> +       if (!res_mmio || !res_reg) {
> +               ret = -ENXIO;
> +               goto out_err;
> +       }
> +
> +       mmio_addr = ioremap_wc(res_mmio->start,
> +                                       res_mmio->end - res_mmio->start);
> +       if (IS_ERR(mmio_addr)) {
> +               ret = -EACCES;
> +               goto out_err;
> +       }
> +
> +       dev_priv->ved_reg_base = mmio_addr + res_reg->start;
> +       dev_priv->ved_reg_offset = res_reg->start;
> +       IPVR_DEBUG_VED("ved_reg_base is %p, range is 0x%llx - 0x%llx.\n",
> +               dev_priv->ved_reg_base,
> +               res_reg->start, res_reg->end);
> +
> +       platform_set_drvdata(dev->platformdev, dev);
> +       pm_runtime_enable(&dev->platformdev->dev);
> +
> +       if (pm_runtime_get_sync(&dev->platformdev->dev) < 0) {
> +               ret = -EBUSY;
> +               goto out_err;
> +       }
> +
> +       IPVR_DEBUG_INIT("MSVDX_CORE_REV_OFFSET by readl is 0x%x.\n",
> +               readl(dev_priv->ved_reg_base + 0x640));
> +       IPVR_DEBUG_INIT("MSVDX_CORE_REV_OFFSET by VED_REG_READ32 is 0x%x.\n",
> +               VED_REG_READ32(MSVDX_CORE_REV_OFFSET));
> +
> +       /* mmu init */
> +       dev_priv->mmu = ipvr_mmu_driver_init((void *)0,
> +               drm_ipvr_trap_pagefaults,
> +               0, dev_priv);
> +       if (!dev_priv->mmu) {
> +               ret = -EBUSY;
> +               goto out_err;
> +       }
> +
> +       dev_priv->pf_pd = ipvr_mmu_alloc_pd(dev_priv->mmu, 1, 0);
> +       if (!dev_priv->pf_pd) {
> +               ret = -ENOMEM;
> +               goto out_err;
> +       }
> +
> +       ipvr_mmu_set_pd_context(ipvr_mmu_get_default_pd(dev_priv->mmu), 0);
> +       ipvr_mmu_set_pd_context(dev_priv->pf_pd, 1);
> +
> +       /*
> +        * Initialize sequence numbers for the different command
> +        * submission mechanisms.
> +        */
> +       dev_priv->last_seq = 1;
> +
> +       ipvr_gem_init(dev);
> +
> +       ipvr_gem_setup_mmu(dev,
> +               IPVR_MEM_MMU_LINEAR_START,
> +               IPVR_MEM_MMU_LINEAR_END,
> +               IPVR_MEM_MMU_TILING_START,
> +               IPVR_MEM_MMU_TILING_END);
> +
> +       ipvr_ved_init(dev);
> +
> +       WARN_ON(pm_runtime_put_sync_suspend(&dev->platformdev->dev) < 0);
> +
> +       dev_priv->ved_private->ved_needs_reset = 1;
> +       mutex_init(&dev_priv->ved_pm_mutex);
> +       atomic_set(&dev_priv->ved_power_usage, 0);
> +
> +       ipvr_fence_driver_init(dev_priv);
> +
> +       dev_priv->validate_ctx.buffers =
> +               vmalloc(IPVR_NUM_VALIDATE_BUFFERS *
> +                       sizeof(struct ipvr_validate_buffer));
> +       if (!dev_priv->validate_ctx.buffers) {
> +               ret = -ENOMEM;
> +               goto out_err;
> +       }
> +
> +       /* ipvr context initialization */
> +       INIT_LIST_HEAD(&dev_priv->ipvr_ctx_list);
> +       spin_lock_init(&dev_priv->ipvr_ctx_lock);
> +       idr_init(&dev_priv->ipvr_ctx_idr);
> +       /* default ipvr context is used for scaling, rotation case */
> +       ctx_id = idr_alloc(&dev_priv->ipvr_ctx_idr, &dev_priv->default_ctx,
> +                          IPVR_MIN_CONTEXT_ID, IPVR_MAX_CONTEXT_ID,
> +                          GFP_KERNEL);
> +       if (ctx_id < 0) {
> +               return -ENOMEM;
> +               goto out_err;
> +       }
> +       dev_priv->default_ctx.ctx_id = ctx_id;
> +       INIT_LIST_HEAD(&dev_priv->default_ctx.head);
> +       dev_priv->default_ctx.ctx_type = 0;
> +       dev_priv->default_ctx.ipvr_fpriv = NULL;
> +
> +       /* don't need protect with spinlock during module load stage */
> +       list_add(&dev_priv->default_ctx.head, &dev_priv->ipvr_ctx_list);
> +       dev_priv->default_ctx.tiling_scheme = 0;
> +       dev_priv->default_ctx.tiling_stride = 0;
> +
> +       return 0;
> +out_err:
> +       ipvr_drm_unload(dev);
> +       return ret;
> +
> +}
> +
> +/*
> + * The .open() method is called every time the device is opened by an
> + * application. Drivers can allocate per-file private data in this method and
> + * store them in the struct drm_file::driver_priv field. Note that the .open()
> + * method is called before .firstopen().
> + */
> +static int32_t
> +ipvr_drm_open(struct drm_device *dev, struct drm_file *file_priv)
> +{
> +       struct drm_ipvr_file_private *ipvr_fp;
> +       IPVR_DEBUG_ENTRY("enter\n");
> +
> +       ipvr_fp = kzalloc(sizeof(*ipvr_fp), GFP_KERNEL);
> +       if (unlikely(ipvr_fp == NULL))
> +               return -ENOMEM;
> +
> +       file_priv->driver_priv = ipvr_fp;
> +
> +       return 0;
> +}
> +
> +/*
> + * The close operation is split into .preclose() and .postclose() methods.
> + * Drivers must stop and cleanup all per-file operations in the .preclose()
> + * method. For instance pending vertical blanking and page flip events must be
> + * cancelled. No per-file operation is allowed on the file handle after
> + * returning from the .preclose() method.
> + */
> +static void
> +ipvr_drm_preclose(struct drm_device *dev, struct drm_file *file_priv)
> +{
> +       /* if user didn't destory ctx explicitly, remove ctx here */
> +       struct drm_ipvr_private *dev_priv;
> +       struct drm_ipvr_file_private *ipvr_fpriv;
> +       struct ved_private *ved_priv;
> +       struct ipvr_context *ipvr_ctx  = NULL;
> +       unsigned long irq_flags;
> +
> +       IPVR_DEBUG_ENTRY("enter\n");
> +       dev_priv = dev->dev_private;
> +       ipvr_fpriv = file_priv->driver_priv;
> +       ved_priv = dev_priv->ved_private;
> +
> +       if (ipvr_fpriv->ctx_id == IPVR_CONTEXT_INVALID_ID)
> +               return;
> +       ipvr_ctx = (struct ipvr_context *)
> +                       idr_find(&dev_priv->ipvr_ctx_idr, ipvr_fpriv->ctx_id);
> +       if (!ipvr_ctx  || (ipvr_ctx->ipvr_fpriv != ipvr_fpriv)) {
> +               IPVR_DEBUG_GENERAL("ctx for id %d has already destroyed\n",
> +                               ipvr_fpriv->ctx_id);
> +               return;
> +       }
> +       IPVR_DEBUG_PM("Video:remove context profile %d, entrypoint %d\n",
> +               (ipvr_ctx->ctx_type >> 8) & 0xff,
> +               (ipvr_ctx->ctx_type & 0xff));
> +       mutex_lock(&ved_priv->ved_mutex);
> +       if (ved_priv->ipvr_ctx == ipvr_ctx )
> +               ved_priv->ipvr_ctx = NULL;
> +       mutex_unlock(&ved_priv->ved_mutex);
> +
> +       spin_lock_irqsave(&dev_priv->ipvr_ctx_lock, irq_flags);
> +       list_del(&ipvr_ctx->head);
> +       ipvr_fpriv->ctx_id = IPVR_CONTEXT_INVALID_ID;
> +       spin_unlock_irqrestore(&dev_priv->ipvr_ctx_lock, irq_flags);
> +
> +       idr_remove(&dev_priv->ipvr_ctx_idr, ipvr_ctx->ctx_id);
> +
> +       kfree(ipvr_ctx );
> +}
> +
> +/*
> + * Finally the .postclose() method is called as the last step of the close
> + * operation, right before calling the .lastclose() method if no other open
> + * file handle exists for the device. Drivers that have allocated per-file
> + * private data in the .open() method should free it here.
> + */
> +static void
> +ipvr_drm_postclose(struct drm_device *dev, struct drm_file *file_priv)
> +{
> +       struct drm_ipvr_file_private *ipvr_fpriv = file_priv->driver_priv;
> +       IPVR_DEBUG_ENTRY("enter\n");
> +       kfree(ipvr_fpriv);
> +}

postclose() is deprecated. You can safely move this into preclose().

> +
> +static irqreturn_t ipvr_irq_handler(int32_t irq, void *arg)
> +{
> +       struct drm_device *dev = (struct drm_device *) arg;
> +       WARN_ON(ved_irq_handler(dev));
> +       return IRQ_HANDLED;
> +}
> +
> +static const struct file_operations ipvr_fops = {
> +       .owner = THIS_MODULE,
> +       .open = drm_open,
> +       .release = drm_release,
> +       .unlocked_ioctl = drm_ioctl,
> +#ifdef CONFIG_COMPAT
> +       .compat_ioctl = drm_ioctl,
> +#endif
> +       /* no need to define mmap. User space maps bo with DRM_IPVR_GEM_MMAP */
> +};
> +
> +static int32_t ipvr_drm_freeze(struct drm_device *dev)
> +{
> +       int32_t ret;
> +       int32_t power_usage;
> +       struct drm_ipvr_private *dev_priv = dev->dev_private;
> +
> +       IPVR_DEBUG_ENTRY("enter\n");
> +       power_usage = atomic_read(&dev_priv->ved_power_usage);
> +       BUG_ON(power_usage < 0);
> +       if (power_usage > 0) {
> +               IPVR_DEBUG_PM("VED power usage is %d, skip freezing\n", power_usage);
> +               return 0;
> +       }
> +
> +       ret = ved_check_idle(dev);
> +       if (ret) {
> +               IPVR_DEBUG_PM("VED check idle fail: %d, skip freezing\n", ret);
> +               return 0;
> +       }
> +
> +       if (dev->irq_enabled) {
> +               ret = drm_irq_uninstall(dev);
> +               if (unlikely(ret)) {
> +                       IPVR_ERROR("Error uninstalling IRQ handler: %d\n", ret);
> +                       return -EFAULT;
> +               }
> +               IPVR_DEBUG_PM("Successfully uninstalled IRQ\n");
> +       }
> +       else
> +               IPVR_DEBUG_PM("irq_enabled is %d\n", dev->irq_enabled);
> +
> +       if (is_ved_on(dev)) {
> +               if (!ved_power_off(dev)) {
> +                       IPVR_ERROR("Failed to power off VED\n");
> +                       return -EFAULT;
> +               }
> +               IPVR_DEBUG_PM("Successfully powered off\n");
> +       } else {
> +               IPVR_DEBUG_PM("Skiped power-off since already powered off\n");
> +       }
> +
> +       return 0;
> +}
> +
> +static int32_t ipvr_drm_thaw(struct drm_device *dev)
> +{
> +       int ret;
> +       IPVR_DEBUG_ENTRY("enter\n");
> +       if (!is_ved_on(dev)) {
> +               if (!ved_power_on(dev)) {
> +                       IPVR_ERROR("Failed to power on VED\n");
> +                       return -EFAULT;
> +               }
> +               IPVR_DEBUG_PM("Successfully powered on\n");
> +       } else {
> +               IPVR_DEBUG_PM("Skiped power-on since already powered on\n");
> +       }
> +
> +       if (!dev->irq_enabled) {
> +               ret = drm_irq_install(dev, dev->irq);
> +               if (ret) {
> +                       IPVR_ERROR("Error installing IRQ handler: %d\n", ret);
> +                       return -EFAULT;
> +               }
> +               IPVR_DEBUG_PM("Successfully installed IRQ\n");
> +       }
> +       else
> +               IPVR_DEBUG_PM("irq_enabled is %d\n", dev->irq_enabled);
> +
> +       return 0;
> +}
> +
> +static int32_t ipvr_pm_suspend(struct device *dev)
> +{
> +       struct platform_device *platformdev = to_platform_device(dev);
> +       struct drm_device *drm_dev = platform_get_drvdata(platformdev);
> +       IPVR_DEBUG_PM("PM suspend called\n");
> +       BUG_ON(!drm_dev);
> +       return ipvr_drm_freeze(drm_dev);
> +}
> +static int32_t ipvr_pm_resume(struct device *dev)
> +{
> +       struct platform_device *platformdev = to_platform_device(dev);
> +       struct drm_device *drm_dev = platform_get_drvdata(platformdev);
> +       IPVR_DEBUG_PM("PM resume called\n");
> +       BUG_ON(!drm_dev);
> +       return ipvr_drm_thaw(drm_dev);
> +}
> +
> +/*
> + * dump GEM API is mainly for dumb buffers suitable for scanout,
> + * it is not needed for ipvr driver.
> + * gem_vm_ops is used for mmap case, also not needed for ipvr
> + * todo: prime support can be enabled later
> + */
> +static struct drm_driver ipvr_drm_driver = {
> +       .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM,
> +       .load = ipvr_drm_load,
> +       .unload = ipvr_drm_unload,
> +       .open = ipvr_drm_open,
> +       .preclose = ipvr_drm_preclose,
> +       .postclose = ipvr_drm_postclose,
> +       .irq_handler = ipvr_irq_handler,
> +       .set_busid = drm_platform_set_busid,
This should be NULL for new drivers.

> +       .gem_free_object = ipvr_gem_free_object,
> +#ifdef CONFIG_DEBUG_FS
> +       .debugfs_init = ipvr_debugfs_init,
> +       .debugfs_cleanup = ipvr_debugfs_cleanup,
> +#endif
> +       .ioctls = ipvr_gem_ioctls,
> +       .num_ioctls = ARRAY_SIZE(ipvr_gem_ioctls),
> +       .fops = &ipvr_fops,
> +       .name = IPVR_DRIVER_NAME,
> +       .desc = IPVR_DRIVER_DESC,
> +       .date = IPVR_DRIVER_DATE,
> +       .major = IPVR_DRIVER_MAJOR,
> +       .minor = IPVR_DRIVER_MINOR,
> +       .patchlevel = IPVR_DRIVER_PATCHLEVEL,
> +};
> +
> +static int32_t ipvr_plat_probe(struct platform_device *device)
> +{
> +       return drm_platform_init(&ipvr_drm_driver, device);

drm_platform_init() should be used. Please use drm_dev_alloc(),
drm_dev_register() directly. udl and tegra should serve as example.

> +}
> +
> +static int32_t ipvr_plat_remove(struct platform_device *device)
> +{
> +       drm_put_dev(platform_get_drvdata(device));

Again, please use drm_dev_unregister() + drm_dev_unref() directly.

Thanks
David

> +       return 0;
> +}
> +
> +static struct dev_pm_ops ipvr_pm_ops = {
> +       .suspend = ipvr_pm_suspend,
> +       .resume = ipvr_pm_resume,
> +       .freeze = ipvr_pm_suspend,
> +       .thaw = ipvr_pm_resume,
> +       .poweroff = ipvr_pm_suspend,
> +       .restore = ipvr_pm_resume,
> +#ifdef CONFIG_PM_RUNTIME
> +       .runtime_suspend = ipvr_pm_suspend,
> +       .runtime_resume = ipvr_pm_resume,
> +#endif
> +};
> +
> +static struct platform_driver ipvr_plat_driver = {
> +       .driver = {
> +               .name = "ipvr-ved",
> +               .owner = THIS_MODULE,
> +#ifdef CONFIG_PM
> +               .pm = &ipvr_pm_ops,
> +#endif
> +       },
> +       .probe = ipvr_plat_probe,
> +       .remove = ipvr_plat_remove,
> +};
> +
> +module_platform_driver(ipvr_plat_driver);
> +MODULE_LICENSE("GPL");
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