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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2012 Red Hat4 *5 * based in parts on udlfb.c:6 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>7 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>8 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>9 */10 11#include <drm/drm.h>12#include <drm/drm_print.h>13#include <drm/drm_probe_helper.h>14 15#include "udl_drv.h"16 17/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */18#define BULK_SIZE 51219 20#define NR_USB_REQUEST_CHANNEL 0x1221 22#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)23#define WRITES_IN_FLIGHT (20)24#define MAX_VENDOR_DESCRIPTOR_SIZE 25625 26static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout);27 28static int udl_parse_vendor_descriptor(struct udl_device *udl)29{30 struct usb_device *udev = udl_to_usb_device(udl);31 char *desc;32 char *buf;33 char *desc_end;34 35 u8 total_len = 0;36 37 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);38 if (!buf)39 return false;40 desc = buf;41 42 total_len = usb_get_descriptor(udev, 0x5f, /* vendor specific */43 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);44 if (total_len > 5) {45 DRM_INFO("vendor descriptor length:%x data:%11ph\n",46 total_len, desc);47 48 if ((desc[0] != total_len) || /* descriptor length */49 (desc[1] != 0x5f) || /* vendor descriptor type */50 (desc[2] != 0x01) || /* version (2 bytes) */51 (desc[3] != 0x00) ||52 (desc[4] != total_len - 2)) /* length after type */53 goto unrecognized;54 55 desc_end = desc + total_len;56 desc += 5; /* the fixed header we've already parsed */57 58 while (desc < desc_end) {59 u8 length;60 u16 key;61 62 key = le16_to_cpu(*((u16 *) desc));63 desc += sizeof(u16);64 length = *desc;65 desc++;66 67 switch (key) {68 case 0x0200: { /* max_area */69 u32 max_area;70 max_area = le32_to_cpu(*((u32 *)desc));71 DRM_DEBUG("DL chip limited to %d pixel modes\n",72 max_area);73 udl->sku_pixel_limit = max_area;74 break;75 }76 default:77 break;78 }79 desc += length;80 }81 }82 83 goto success;84 85unrecognized:86 /* allow udlfb to load for now even if firmware unrecognized */87 DRM_ERROR("Unrecognized vendor firmware descriptor\n");88 89success:90 kfree(buf);91 return true;92}93 94/*95 * Need to ensure a channel is selected before submitting URBs96 */97int udl_select_std_channel(struct udl_device *udl)98{99 static const u8 set_def_chn[] = {0x57, 0xCD, 0xDC, 0xA7,100 0x1C, 0x88, 0x5E, 0x15,101 0x60, 0xFE, 0xC6, 0x97,102 0x16, 0x3D, 0x47, 0xF2};103 104 void *sendbuf;105 int ret;106 struct usb_device *udev = udl_to_usb_device(udl);107 108 sendbuf = kmemdup(set_def_chn, sizeof(set_def_chn), GFP_KERNEL);109 if (!sendbuf)110 return -ENOMEM;111 112 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),113 NR_USB_REQUEST_CHANNEL,114 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,115 sendbuf, sizeof(set_def_chn),116 USB_CTRL_SET_TIMEOUT);117 kfree(sendbuf);118 return ret < 0 ? ret : 0;119}120 121void udl_urb_completion(struct urb *urb)122{123 struct urb_node *unode = urb->context;124 struct udl_device *udl = unode->dev;125 unsigned long flags;126 127 /* sync/async unlink faults aren't errors */128 if (urb->status) {129 if (!(urb->status == -ENOENT ||130 urb->status == -ECONNRESET ||131 urb->status == -EPROTO ||132 urb->status == -ESHUTDOWN)) {133 DRM_ERROR("%s - nonzero write bulk status received: %d\n",134 __func__, urb->status);135 }136 }137 138 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */139 140 spin_lock_irqsave(&udl->urbs.lock, flags);141 list_add_tail(&unode->entry, &udl->urbs.list);142 udl->urbs.available++;143 spin_unlock_irqrestore(&udl->urbs.lock, flags);144 145 wake_up(&udl->urbs.sleep);146}147 148static void udl_free_urb_list(struct drm_device *dev)149{150 struct udl_device *udl = to_udl(dev);151 struct urb_node *unode;152 struct urb *urb;153 154 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");155 156 /* keep waiting and freeing, until we've got 'em all */157 while (udl->urbs.count) {158 spin_lock_irq(&udl->urbs.lock);159 urb = udl_get_urb_locked(udl, MAX_SCHEDULE_TIMEOUT);160 udl->urbs.count--;161 spin_unlock_irq(&udl->urbs.lock);162 if (WARN_ON(!urb))163 break;164 unode = urb->context;165 /* Free each separately allocated piece */166 usb_free_coherent(urb->dev, udl->urbs.size,167 urb->transfer_buffer, urb->transfer_dma);168 usb_free_urb(urb);169 kfree(unode);170 }171 172 wake_up_all(&udl->urbs.sleep);173}174 175static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)176{177 struct udl_device *udl = to_udl(dev);178 struct urb *urb;179 struct urb_node *unode;180 char *buf;181 size_t wanted_size = count * size;182 struct usb_device *udev = udl_to_usb_device(udl);183 184 spin_lock_init(&udl->urbs.lock);185 INIT_LIST_HEAD(&udl->urbs.list);186 init_waitqueue_head(&udl->urbs.sleep);187 udl->urbs.count = 0;188 udl->urbs.available = 0;189 190retry:191 udl->urbs.size = size;192 193 while (udl->urbs.count * size < wanted_size) {194 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);195 if (!unode)196 break;197 unode->dev = udl;198 199 urb = usb_alloc_urb(0, GFP_KERNEL);200 if (!urb) {201 kfree(unode);202 break;203 }204 unode->urb = urb;205 206 buf = usb_alloc_coherent(udev, size, GFP_KERNEL,207 &urb->transfer_dma);208 if (!buf) {209 kfree(unode);210 usb_free_urb(urb);211 if (size > PAGE_SIZE) {212 size /= 2;213 udl_free_urb_list(dev);214 goto retry;215 }216 break;217 }218 219 /* urb->transfer_buffer_length set to actual before submit */220 usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, 1),221 buf, size, udl_urb_completion, unode);222 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;223 224 list_add_tail(&unode->entry, &udl->urbs.list);225 226 udl->urbs.count++;227 udl->urbs.available++;228 }229 230 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);231 232 return udl->urbs.count;233}234 235static struct urb *udl_get_urb_locked(struct udl_device *udl, long timeout)236{237 struct urb_node *unode;238 239 assert_spin_locked(&udl->urbs.lock);240 241 /* Wait for an in-flight buffer to complete and get re-queued */242 if (!wait_event_lock_irq_timeout(udl->urbs.sleep,243 !udl->urbs.count ||244 !list_empty(&udl->urbs.list),245 udl->urbs.lock, timeout)) {246 DRM_INFO("wait for urb interrupted: available: %d\n",247 udl->urbs.available);248 return NULL;249 }250 251 if (!udl->urbs.count)252 return NULL;253 254 unode = list_first_entry(&udl->urbs.list, struct urb_node, entry);255 list_del_init(&unode->entry);256 udl->urbs.available--;257 258 return unode->urb;259}260 261#define GET_URB_TIMEOUT HZ262struct urb *udl_get_urb(struct drm_device *dev)263{264 struct udl_device *udl = to_udl(dev);265 struct urb *urb;266 267 spin_lock_irq(&udl->urbs.lock);268 urb = udl_get_urb_locked(udl, GET_URB_TIMEOUT);269 spin_unlock_irq(&udl->urbs.lock);270 return urb;271}272 273int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)274{275 struct udl_device *udl = to_udl(dev);276 int ret;277 278 if (WARN_ON(len > udl->urbs.size)) {279 ret = -EINVAL;280 goto error;281 }282 urb->transfer_buffer_length = len; /* set to actual payload len */283 ret = usb_submit_urb(urb, GFP_ATOMIC);284 error:285 if (ret) {286 udl_urb_completion(urb); /* because no one else will */287 DRM_ERROR("usb_submit_urb error %x\n", ret);288 }289 return ret;290}291 292/* wait until all pending URBs have been processed */293void udl_sync_pending_urbs(struct drm_device *dev)294{295 struct udl_device *udl = to_udl(dev);296 297 spin_lock_irq(&udl->urbs.lock);298 /* 2 seconds as a sane timeout */299 if (!wait_event_lock_irq_timeout(udl->urbs.sleep,300 udl->urbs.available == udl->urbs.count,301 udl->urbs.lock,302 msecs_to_jiffies(2000)))303 drm_err(dev, "Timeout for syncing pending URBs\n");304 spin_unlock_irq(&udl->urbs.lock);305}306 307int udl_init(struct udl_device *udl)308{309 struct drm_device *dev = &udl->drm;310 int ret = -ENOMEM;311 312 DRM_DEBUG("\n");313 314 udl->dmadev = usb_intf_get_dma_device(to_usb_interface(dev->dev));315 if (!udl->dmadev)316 drm_warn(dev, "buffer sharing not supported"); /* not an error */317 318 mutex_init(&udl->gem_lock);319 320 if (!udl_parse_vendor_descriptor(udl)) {321 ret = -ENODEV;322 DRM_ERROR("firmware not recognized. Assume incompatible device\n");323 goto err;324 }325 326 if (udl_select_std_channel(udl))327 DRM_ERROR("Selecting channel failed\n");328 329 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {330 DRM_ERROR("udl_alloc_urb_list failed\n");331 goto err;332 }333 334 DRM_DEBUG("\n");335 ret = udl_modeset_init(dev);336 if (ret)337 goto err;338 339 drm_kms_helper_poll_init(dev);340 341 return 0;342 343err:344 if (udl->urbs.count)345 udl_free_urb_list(dev);346 put_device(udl->dmadev);347 DRM_ERROR("%d\n", ret);348 return ret;349}350 351int udl_drop_usb(struct drm_device *dev)352{353 struct udl_device *udl = to_udl(dev);354 355 udl_free_urb_list(dev);356 put_device(udl->dmadev);357 udl->dmadev = NULL;358 359 return 0;360}361