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155 lines
4.4 KiB
Diff
155 lines
4.4 KiB
Diff
From b5bd7b621f6ab2f29e9f18ec2a2720d702b9727c Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.org>
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Date: Fri, 25 Jan 2019 17:12:54 +0000
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Subject: [PATCH] video: bcm2708_fb: Add compat_ioctl support.
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When using a 64 bit kernel with 32 bit userspace we need
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compat ioctl handling for FBIODMACOPY as one of the
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parameters is a pointer.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
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---
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drivers/video/fbdev/bcm2708_fb.c | 87 ++++++++++++++++++++++++--------
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1 file changed, 66 insertions(+), 21 deletions(-)
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--- a/drivers/video/fbdev/bcm2708_fb.c
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+++ b/drivers/video/fbdev/bcm2708_fb.c
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@@ -482,9 +482,8 @@ static void dma_memcpy(struct bcm2708_fb
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/* cache coherent but non-allocating in L1 and L2 */
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#define INTALIAS_L1L2_NONALLOCATING(x) (((x)&~0xc0000000)|0x80000000)
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-static long vc_mem_copy(struct bcm2708_fb *fb, unsigned long arg)
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+static long vc_mem_copy(struct bcm2708_fb *fb, struct fb_dmacopy *ioparam)
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{
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- struct fb_dmacopy ioparam;
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size_t size = PAGE_SIZE;
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u32 *buf = NULL;
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dma_addr_t bus_addr;
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@@ -497,26 +496,16 @@ static long vc_mem_copy(struct bcm2708_f
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goto out;
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}
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- /* Get the parameter data.
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- */
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- if (copy_from_user
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- (&ioparam, (void *)arg, sizeof(ioparam)) != 0) {
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- pr_err("[%s]: failed to copy-from-user\n",
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- __func__);
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- rc = -EFAULT;
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- goto out;
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- }
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-
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- if (fb->gpu.base == 0 || fb->gpu.length == 0) {
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+ if (!fb->gpu.base || !fb->gpu.length) {
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pr_err("[%s]: Unable to determine gpu memory (%x,%x)\n",
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__func__, fb->gpu.base, fb->gpu.length);
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return -EFAULT;
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}
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- if (INTALIAS_NORMAL(ioparam.src) < fb->gpu.base ||
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- INTALIAS_NORMAL(ioparam.src) >= fb->gpu.base + fb->gpu.length) {
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+ if (INTALIAS_NORMAL(ioparam->src) < fb->gpu.base ||
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+ INTALIAS_NORMAL(ioparam->src) >= fb->gpu.base + fb->gpu.length) {
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pr_err("[%s]: Invalid memory access %x (%x-%x)", __func__,
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- INTALIAS_NORMAL(ioparam.src), fb->gpu.base,
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+ INTALIAS_NORMAL(ioparam->src), fb->gpu.base,
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fb->gpu.base + fb->gpu.length);
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return -EFAULT;
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}
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@@ -530,11 +519,11 @@ static long vc_mem_copy(struct bcm2708_f
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goto out;
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}
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- for (offset = 0; offset < ioparam.length; offset += size) {
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- size_t remaining = ioparam.length - offset;
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+ for (offset = 0; offset < ioparam->length; offset += size) {
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+ size_t remaining = ioparam->length - offset;
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size_t s = min(size, remaining);
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- unsigned char *p = (unsigned char *)ioparam.src + offset;
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- unsigned char *q = (unsigned char *)ioparam.dst + offset;
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+ u8 *p = (u8 *)((uintptr_t)ioparam->src + offset);
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+ u8 *q = (u8 *)ioparam->dst + offset;
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dma_memcpy(fb, bus_addr,
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INTALIAS_L1L2_NONALLOCATING((dma_addr_t)p), size);
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@@ -566,8 +555,19 @@ static int bcm2708_ioctl(struct fb_info
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&dummy, sizeof(dummy));
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break;
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case FBIODMACOPY:
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- ret = vc_mem_copy(fb, arg);
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+ {
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+ struct fb_dmacopy ioparam;
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+ /* Get the parameter data.
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+ */
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+ if (copy_from_user
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+ (&ioparam, (void *)arg, sizeof(ioparam))) {
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+ pr_err("[%s]: failed to copy-from-user\n", __func__);
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+ ret = -EFAULT;
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+ break;
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+ }
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+ ret = vc_mem_copy(fb, &ioparam);
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break;
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+ }
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default:
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dev_dbg(info->device, "Unknown ioctl 0x%x\n", cmd);
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return -ENOTTY;
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@@ -578,6 +578,48 @@ static int bcm2708_ioctl(struct fb_info
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return ret;
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}
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+
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+#ifdef CONFIG_COMPAT
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+struct fb_dmacopy32 {
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+ compat_uptr_t dst;
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+ __u32 src;
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+ __u32 length;
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+};
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+
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+#define FBIODMACOPY32 _IOW('z', 0x22, struct fb_dmacopy32)
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+
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+static int bcm2708_compat_ioctl(struct fb_info *info, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ struct bcm2708_fb *fb = to_bcm2708(info);
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+ int ret;
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+
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+ switch (cmd) {
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+ case FBIODMACOPY32:
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+ {
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+ struct fb_dmacopy32 param32;
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+ struct fb_dmacopy param;
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+ /* Get the parameter data.
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+ */
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+ if (copy_from_user(¶m32, (void *)arg, sizeof(param32))) {
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+ pr_err("[%s]: failed to copy-from-user\n", __func__);
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+ ret = -EFAULT;
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+ break;
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+ }
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+ param.dst = compat_ptr(param32.dst);
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+ param.src = param32.src;
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+ param.length = param32.length;
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+ ret = vc_mem_copy(fb, ¶m);
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+ break;
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+ }
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+ default:
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+ ret = bcm2708_ioctl(info, cmd, arg);
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+ break;
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+ }
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+ return ret;
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+}
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+#endif
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+
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static void bcm2708_fb_fillrect(struct fb_info *info,
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const struct fb_fillrect *rect)
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{
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@@ -768,6 +810,9 @@ static struct fb_ops bcm2708_fb_ops = {
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.fb_imageblit = bcm2708_fb_imageblit,
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.fb_pan_display = bcm2708_fb_pan_display,
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.fb_ioctl = bcm2708_ioctl,
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+#ifdef CONFIG_COMPAT
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+ .fb_compat_ioctl = bcm2708_compat_ioctl,
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+#endif
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};
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static int bcm2708_fb_register(struct bcm2708_fb *fb)
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