target/linux/brcm2708/patches-4.9/950-0056-fbdev-add-FBIOCOPYAREA-ioctl.patch

   1 From 65422160b21224e6d26641a4c1fa3082c0281488 Mon Sep 17 00:00:00 2001
   2 From: Siarhei Siamashka <siarhei.siamashka@gmail.com>
   3 Date: Mon, 17 Jun 2013 13:32:11 +0300
   4 Subject: [PATCH] fbdev: add FBIOCOPYAREA ioctl
   5
   6 Based on the patch authored by Ali Gholami Rudi at
   7     https://lkml.org/lkml/2009/7/13/153
   8
   9 Provide an ioctl for userspace applications, but only if this operation
  10 is hardware accelerated (otherwide it does not make any sense).
  11
  12 Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
  13
  14 bcm2708_fb: Add ioctl for reading gpu memory through dma
  15 ---
  16  drivers/video/fbdev/bcm2708_fb.c | 109 +++++++++++++++++++++++++++++++++++++++
  17  drivers/video/fbdev/core/fbmem.c |  36 +++++++++++++
  18  include/uapi/linux/fb.h          |  12 +++++
  19  3 files changed, 157 insertions(+)
  20
  21 --- a/drivers/video/fbdev/bcm2708_fb.c
  22 +++ b/drivers/video/fbdev/bcm2708_fb.c
  23 @@ -31,8 +31,10 @@
  24  #include <linux/console.h>
  25  #include <linux/debugfs.h>
  26  #include <asm/sizes.h>
  27 +#include <asm/uaccess.h>
  28  #include <linux/io.h>
  29  #include <linux/dma-mapping.h>
  30 +#include <linux/cred.h>
  31  #include <soc/bcm2835/raspberrypi-firmware.h>
  32
  33  //#define BCM2708_FB_DEBUG
  34 @@ -426,6 +428,110 @@ static int bcm2708_fb_pan_display(struct
  35         return result;
  36  }
  37
  38 +static void dma_memcpy(struct bcm2708_fb *fb, dma_addr_t dst, dma_addr_t src, int size)
  39 +{
  40 +       int burst_size = (fb->dma_chan == 0) ? 8 : 2;
  41 +       struct bcm2708_dma_cb *cb = fb->cb_base;
  42 +
  43 +       cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH |
  44 +                  BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH |
  45 +                  BCM2708_DMA_D_INC;
  46 +       cb->dst = dst;
  47 +       cb->src = src;
  48 +       cb->length = size;
  49 +       cb->stride = 0;
  50 +       cb->pad[0] = 0;
  51 +       cb->pad[1] = 0;
  52 +       cb->next = 0;
  53 +
  54 +       if (size < dma_busy_wait_threshold) {
  55 +               bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
  56 +               bcm_dma_wait_idle(fb->dma_chan_base);
  57 +       } else {
  58 +               void __iomem *dma_chan = fb->dma_chan_base;
  59 +               cb->info |= BCM2708_DMA_INT_EN;
  60 +               bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
  61 +               while (bcm_dma_is_busy(dma_chan)) {
  62 +                       wait_event_interruptible(
  63 +                               fb->dma_waitq,
  64 +                               !bcm_dma_is_busy(dma_chan));
  65 +               }
  66 +               fb->stats.dma_irqs++;
  67 +       }
  68 +       fb->stats.dma_copies++;
  69 +}
  70 +
  71 +#define INTALIAS_NORMAL(x) ((x)&~0xc0000000) // address with no aliases
  72 +#define INTALIAS_L1L2_NONALLOCATING(x) (((x)&~0xc0000000)|0x80000000) // cache coherent but non-allocating in L1 and L2
  73 +
  74 +static long vc_mem_copy(struct bcm2708_fb *fb, unsigned long arg)
  75 +{
  76 +       struct fb_dmacopy ioparam;
  77 +       size_t size = PAGE_SIZE;
  78 +       u32 *buf = NULL;
  79 +       dma_addr_t bus_addr;
  80 +       long rc = 0;
  81 +       size_t offset;
  82 +       struct { u32 base, length; } gpu = {};
  83 +
  84 +       /* restrict this to root user */
  85 +       if (!uid_eq(current_euid(), GLOBAL_ROOT_UID))
  86 +       {
  87 +               rc = -EFAULT;
  88 +               goto out;
  89 +       }
  90 +
  91 +       /* Get the parameter data.
  92 +        */
  93 +       if (copy_from_user
  94 +           (&ioparam, (void *)arg, sizeof(ioparam)) != 0) {
  95 +               pr_err("[%s]: failed to copy-from-user\n",
  96 +                               __func__);
  97 +               rc = -EFAULT;
  98 +               goto out;
  99 +       }
 100 +
 101 +       rc = rpi_firmware_property(fb->fw,
 102 +                                   RPI_FIRMWARE_GET_VC_MEMORY,
 103 +                                   &gpu, sizeof(gpu));
 104 +       if (rc != 0 || gpu.base == 0 || gpu.length == 0) {
 105 +               pr_err("[%s]: Unable to determine gpu memory %ld,%x,%x)\n", __func__, rc, gpu.base, gpu.length);
 106 +               return -EFAULT;
 107 +       }
 108 +
 109 +       if (INTALIAS_NORMAL(ioparam.src) < gpu.base || INTALIAS_NORMAL(ioparam.src) >= gpu.base + gpu.length) {
 110 +               pr_err("[%s]: Invalid memory access %x (%x-%x)", __func__, INTALIAS_NORMAL(ioparam.src), gpu.base, gpu.base + gpu.length);
 111 +               return -EFAULT;
 112 +       }
 113 +
 114 +       buf = dma_alloc_coherent(fb->fb.device, PAGE_ALIGN(size), &bus_addr,
 115 +                                GFP_ATOMIC);
 116 +       if (!buf) {
 117 +               pr_err("[%s]: failed to dma_alloc_coherent(%d)\n",
 118 +                               __func__, size);
 119 +               rc = -ENOMEM;
 120 +               goto out;
 121 +       }
 122 +
 123 +       for (offset = 0; offset < ioparam.length; offset += size) {
 124 +               size_t remaining = ioparam.length - offset;
 125 +               size_t s = min(size, remaining);
 126 +               unsigned char *p = (unsigned char *)ioparam.src + offset;
 127 +               unsigned char *q = (unsigned char *)ioparam.dst + offset;
 128 +               dma_memcpy(fb, bus_addr, INTALIAS_L1L2_NONALLOCATING((dma_addr_t)p), size);
 129 +               if (copy_to_user(q, buf, s) != 0) {
 130 +                       pr_err("[%s]: failed to copy-to-user\n",
 131 +                                       __func__);
 132 +                       rc = -EFAULT;
 133 +                       goto out;
 134 +               }
 135 +       }
 136 +out:
 137 +       if (buf)
 138 +               dma_free_coherent(fb->fb.device, PAGE_ALIGN(size), buf, bus_addr);
 139 +       return rc;
 140 +}
 141 +
 142  static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
 143  {
 144         struct bcm2708_fb *fb = to_bcm2708(info);
 145 @@ -438,6 +544,9 @@ static int bcm2708_ioctl(struct fb_info
 146                                             RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC,
 147                                             &dummy, sizeof(dummy));
 148                 break;
 149 +       case FBIODMACOPY:
 150 +               ret = vc_mem_copy(fb, arg);
 151 +               break;
 152         default:
 153                 dev_dbg(info->device, "Unknown ioctl 0x%x\n", cmd);
 154                 return -ENOTTY;
 155 --- a/drivers/video/fbdev/core/fbmem.c
 156 +++ b/drivers/video/fbdev/core/fbmem.c
 157 @@ -1088,6 +1088,31 @@ fb_blank(struct fb_info *info, int blank
 158  }
 159  EXPORT_SYMBOL(fb_blank);
 160
 161 +static int fb_copyarea_user(struct fb_info *info,
 162 +                           struct fb_copyarea *copy)
 163 +{
 164 +       int ret = 0;
 165 +       if (!lock_fb_info(info))
 166 +               return -ENODEV;
 167 +       if (copy->dx >= info->var.xres ||
 168 +           copy->sx >= info->var.xres ||
 169 +           copy->width > info->var.xres ||
 170 +           copy->dy >= info->var.yres ||
 171 +           copy->sy >= info->var.yres ||
 172 +           copy->height > info->var.yres ||
 173 +           copy->dx + copy->width > info->var.xres ||
 174 +           copy->sx + copy->width > info->var.xres ||
 175 +           copy->dy + copy->height > info->var.yres ||
 176 +           copy->sy + copy->height > info->var.yres) {
 177 +               ret = -EINVAL;
 178 +               goto out;
 179 +       }
 180 +       info->fbops->fb_copyarea(info, copy);
 181 +out:
 182 +       unlock_fb_info(info);
 183 +       return ret;
 184 +}
 185 +
 186  static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
 187                         unsigned long arg)
 188  {
 189 @@ -1098,6 +1123,7 @@ static long do_fb_ioctl(struct fb_info *
 190         struct fb_cmap cmap_from;
 191         struct fb_cmap_user cmap;
 192         struct fb_event event;
 193 +       struct fb_copyarea copy;
 194         void __user *argp = (void __user *)arg;
 195         long ret = 0;
 196
 197 @@ -1215,6 +1241,15 @@ static long do_fb_ioctl(struct fb_info *
 198                 unlock_fb_info(info);
 199                 console_unlock();
 200                 break;
 201 +       case FBIOCOPYAREA:
 202 +               if (info->flags & FBINFO_HWACCEL_COPYAREA) {
 203 +                       /* only provide this ioctl if it is accelerated */
 204 +                       if (copy_from_user(&copy, argp, sizeof(copy)))
 205 +                               return -EFAULT;
 206 +                       ret = fb_copyarea_user(info, &copy);
 207 +                       break;
 208 +               }
 209 +               /* fall through */
 210         default:
 211                 if (!lock_fb_info(info))
 212                         return -ENODEV;
 213 @@ -1369,6 +1404,7 @@ static long fb_compat_ioctl(struct file
 214         case FBIOPAN_DISPLAY:
 215         case FBIOGET_CON2FBMAP:
 216         case FBIOPUT_CON2FBMAP:
 217 +       case FBIOCOPYAREA:
 218                 arg = (unsigned long) compat_ptr(arg);
 219         case FBIOBLANK:
 220                 ret = do_fb_ioctl(info, cmd, arg);
 221 --- a/include/uapi/linux/fb.h
 222 +++ b/include/uapi/linux/fb.h
 223 @@ -34,6 +34,12 @@
 224  #define FBIOPUT_MODEINFO        0x4617
 225  #define FBIOGET_DISPINFO        0x4618
 226  #define FBIO_WAITFORVSYNC      _IOW('F', 0x20, __u32)
 227 +/*
 228 + * HACK: use 'z' in order not to clash with any other ioctl numbers which might
 229 + * be concurrently added to the mainline kernel
 230 + */
 231 +#define FBIOCOPYAREA           _IOW('z', 0x21, struct fb_copyarea)
 232 +#define FBIODMACOPY            _IOW('z', 0x22, struct fb_dmacopy)
 233
 234  #define FB_TYPE_PACKED_PIXELS          0       /* Packed Pixels        */
 235  #define FB_TYPE_PLANES                 1       /* Non interleaved planes */
 236 @@ -346,6 +352,12 @@ struct fb_copyarea {
 237         __u32 sy;
 238  };
 239
 240 +struct fb_dmacopy {
 241 +       void *dst;
 242 +       __u32 src;
 243 +       __u32 length;
 244 +};
 245 +
 246  struct fb_fillrect {
 247         __u32 dx;       /* screen-relative */
 248         __u32 dy;