From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/gpu/drm/udl/udl_main.c | 352 ++++++++++++++++++++++++++++++++++ 1 file changed, 352 insertions(+) create mode 100644 kernel/drivers/gpu/drm/udl/udl_main.c (limited to 'kernel/drivers/gpu/drm/udl/udl_main.c') diff --git a/kernel/drivers/gpu/drm/udl/udl_main.c b/kernel/drivers/gpu/drm/udl/udl_main.c new file mode 100644 index 000000000..33dbfb2c4 --- /dev/null +++ b/kernel/drivers/gpu/drm/udl/udl_main.c @@ -0,0 +1,352 @@ +/* + * Copyright (C) 2012 Red Hat + * + * based in parts on udlfb.c: + * Copyright (C) 2009 Roberto De Ioris + * Copyright (C) 2009 Jaya Kumar + * Copyright (C) 2009 Bernie Thompson + * + * This file is subject to the terms and conditions of the GNU General Public + * License v2. See the file COPYING in the main directory of this archive for + * more details. + */ +#include +#include "udl_drv.h" + +/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */ +#define BULK_SIZE 512 + +#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE) +#define WRITES_IN_FLIGHT (4) +#define MAX_VENDOR_DESCRIPTOR_SIZE 256 + +#define GET_URB_TIMEOUT HZ +#define FREE_URB_TIMEOUT (HZ*2) + +static int udl_parse_vendor_descriptor(struct drm_device *dev, + struct usb_device *usbdev) +{ + struct udl_device *udl = dev->dev_private; + char *desc; + char *buf; + char *desc_end; + + u8 total_len = 0; + + buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); + if (!buf) + return false; + desc = buf; + + total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */ + 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); + if (total_len > 5) { + DRM_INFO("vendor descriptor length:%x data:%11ph\n", + total_len, desc); + + if ((desc[0] != total_len) || /* descriptor length */ + (desc[1] != 0x5f) || /* vendor descriptor type */ + (desc[2] != 0x01) || /* version (2 bytes) */ + (desc[3] != 0x00) || + (desc[4] != total_len - 2)) /* length after type */ + goto unrecognized; + + desc_end = desc + total_len; + desc += 5; /* the fixed header we've already parsed */ + + while (desc < desc_end) { + u8 length; + u16 key; + + key = le16_to_cpu(*((u16 *) desc)); + desc += sizeof(u16); + length = *desc; + desc++; + + switch (key) { + case 0x0200: { /* max_area */ + u32 max_area; + max_area = le32_to_cpu(*((u32 *)desc)); + DRM_DEBUG("DL chip limited to %d pixel modes\n", + max_area); + udl->sku_pixel_limit = max_area; + break; + } + default: + break; + } + desc += length; + } + } + + goto success; + +unrecognized: + /* allow udlfb to load for now even if firmware unrecognized */ + DRM_ERROR("Unrecognized vendor firmware descriptor\n"); + +success: + kfree(buf); + return true; +} + +static void udl_release_urb_work(struct work_struct *work) +{ + struct urb_node *unode = container_of(work, struct urb_node, + release_urb_work.work); + + up(&unode->dev->urbs.limit_sem); +} + +void udl_urb_completion(struct urb *urb) +{ + struct urb_node *unode = urb->context; + struct udl_device *udl = unode->dev; + unsigned long flags; + + /* sync/async unlink faults aren't errors */ + if (urb->status) { + if (!(urb->status == -ENOENT || + urb->status == -ECONNRESET || + urb->status == -ESHUTDOWN)) { + DRM_ERROR("%s - nonzero write bulk status received: %d\n", + __func__, urb->status); + atomic_set(&udl->lost_pixels, 1); + } + } + + urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */ + + spin_lock_irqsave(&udl->urbs.lock, flags); + list_add_tail(&unode->entry, &udl->urbs.list); + udl->urbs.available++; + spin_unlock_irqrestore(&udl->urbs.lock, flags); + +#if 0 + /* + * When using fb_defio, we deadlock if up() is called + * while another is waiting. So queue to another process. + */ + if (fb_defio) + schedule_delayed_work(&unode->release_urb_work, 0); + else +#endif + up(&udl->urbs.limit_sem); +} + +static void udl_free_urb_list(struct drm_device *dev) +{ + struct udl_device *udl = dev->dev_private; + int count = udl->urbs.count; + struct list_head *node; + struct urb_node *unode; + struct urb *urb; + int ret; + unsigned long flags; + + DRM_DEBUG("Waiting for completes and freeing all render urbs\n"); + + /* keep waiting and freeing, until we've got 'em all */ + while (count--) { + + /* Getting interrupted means a leak, but ok at shutdown*/ + ret = down_interruptible(&udl->urbs.limit_sem); + if (ret) + break; + + spin_lock_irqsave(&udl->urbs.lock, flags); + + node = udl->urbs.list.next; /* have reserved one with sem */ + list_del_init(node); + + spin_unlock_irqrestore(&udl->urbs.lock, flags); + + unode = list_entry(node, struct urb_node, entry); + urb = unode->urb; + + /* Free each separately allocated piece */ + usb_free_coherent(urb->dev, udl->urbs.size, + urb->transfer_buffer, urb->transfer_dma); + usb_free_urb(urb); + kfree(node); + } + udl->urbs.count = 0; +} + +static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size) +{ + struct udl_device *udl = dev->dev_private; + int i = 0; + struct urb *urb; + struct urb_node *unode; + char *buf; + + spin_lock_init(&udl->urbs.lock); + + udl->urbs.size = size; + INIT_LIST_HEAD(&udl->urbs.list); + + while (i < count) { + unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL); + if (!unode) + break; + unode->dev = udl; + + INIT_DELAYED_WORK(&unode->release_urb_work, + udl_release_urb_work); + + urb = usb_alloc_urb(0, GFP_KERNEL); + if (!urb) { + kfree(unode); + break; + } + unode->urb = urb; + + buf = usb_alloc_coherent(udl->udev, MAX_TRANSFER, GFP_KERNEL, + &urb->transfer_dma); + if (!buf) { + kfree(unode); + usb_free_urb(urb); + break; + } + + /* urb->transfer_buffer_length set to actual before submit */ + usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1), + buf, size, udl_urb_completion, unode); + urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; + + list_add_tail(&unode->entry, &udl->urbs.list); + + i++; + } + + sema_init(&udl->urbs.limit_sem, i); + udl->urbs.count = i; + udl->urbs.available = i; + + DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size); + + return i; +} + +struct urb *udl_get_urb(struct drm_device *dev) +{ + struct udl_device *udl = dev->dev_private; + int ret = 0; + struct list_head *entry; + struct urb_node *unode; + struct urb *urb = NULL; + unsigned long flags; + + /* Wait for an in-flight buffer to complete and get re-queued */ + ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT); + if (ret) { + atomic_set(&udl->lost_pixels, 1); + DRM_INFO("wait for urb interrupted: %x available: %d\n", + ret, udl->urbs.available); + goto error; + } + + spin_lock_irqsave(&udl->urbs.lock, flags); + + BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */ + entry = udl->urbs.list.next; + list_del_init(entry); + udl->urbs.available--; + + spin_unlock_irqrestore(&udl->urbs.lock, flags); + + unode = list_entry(entry, struct urb_node, entry); + urb = unode->urb; + +error: + return urb; +} + +int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len) +{ + struct udl_device *udl = dev->dev_private; + int ret; + + BUG_ON(len > udl->urbs.size); + + urb->transfer_buffer_length = len; /* set to actual payload len */ + ret = usb_submit_urb(urb, GFP_ATOMIC); + if (ret) { + udl_urb_completion(urb); /* because no one else will */ + atomic_set(&udl->lost_pixels, 1); + DRM_ERROR("usb_submit_urb error %x\n", ret); + } + return ret; +} + +int udl_driver_load(struct drm_device *dev, unsigned long flags) +{ + struct usb_device *udev = (void*)flags; + struct udl_device *udl; + int ret = -ENOMEM; + + DRM_DEBUG("\n"); + udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL); + if (!udl) + return -ENOMEM; + + udl->udev = udev; + udl->ddev = dev; + dev->dev_private = udl; + + if (!udl_parse_vendor_descriptor(dev, udl->udev)) { + ret = -ENODEV; + DRM_ERROR("firmware not recognized. Assume incompatible device\n"); + goto err; + } + + if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) { + DRM_ERROR("udl_alloc_urb_list failed\n"); + goto err; + } + + DRM_DEBUG("\n"); + ret = udl_modeset_init(dev); + if (ret) + goto err; + + ret = udl_fbdev_init(dev); + if (ret) + goto err; + + ret = drm_vblank_init(dev, 1); + if (ret) + goto err_fb; + + return 0; +err_fb: + udl_fbdev_cleanup(dev); +err: + if (udl->urbs.count) + udl_free_urb_list(dev); + kfree(udl); + DRM_ERROR("%d\n", ret); + return ret; +} + +int udl_drop_usb(struct drm_device *dev) +{ + udl_free_urb_list(dev); + return 0; +} + +int udl_driver_unload(struct drm_device *dev) +{ + struct udl_device *udl = dev->dev_private; + + drm_vblank_cleanup(dev); + + if (udl->urbs.count) + udl_free_urb_list(dev); + + udl_fbdev_cleanup(dev); + udl_modeset_cleanup(dev); + kfree(udl); + return 0; +} -- cgit 1.2.3-korg