diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0531-bcm2708_fb-Add-ioctl-for-reading-gpu-memory-through-.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0531-bcm2708_fb-Add-ioctl-for-reading-gpu-memory-through-.patch | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0531-bcm2708_fb-Add-ioctl-for-reading-gpu-memory-through-.patch b/target/linux/brcm2708/patches-4.4/0531-bcm2708_fb-Add-ioctl-for-reading-gpu-memory-through-.patch deleted file mode 100644 index 9d0e527434..0000000000 --- a/target/linux/brcm2708/patches-4.4/0531-bcm2708_fb-Add-ioctl-for-reading-gpu-memory-through-.patch +++ /dev/null @@ -1,167 +0,0 @@ -From c6175951b8f95d9f2c30d00ec069cafd23c6f376 Mon Sep 17 00:00:00 2001 -From: popcornmix <popcornmix@gmail.com> -Date: Sat, 5 Nov 2016 14:14:43 +0000 -Subject: [PATCH] bcm2708_fb: Add ioctl for reading gpu memory through dma - ---- - drivers/video/fbdev/bcm2708_fb.c | 109 +++++++++++++++++++++++++++++++++++++++ - include/uapi/linux/fb.h | 7 +++ - 2 files changed, 116 insertions(+) - ---- a/drivers/video/fbdev/bcm2708_fb.c -+++ b/drivers/video/fbdev/bcm2708_fb.c -@@ -31,8 +31,10 @@ - #include <linux/console.h> - #include <linux/debugfs.h> - #include <asm/sizes.h> -+#include <asm/uaccess.h> - #include <linux/io.h> - #include <linux/dma-mapping.h> -+#include <linux/cred.h> - #include <soc/bcm2835/raspberrypi-firmware.h> - - //#define BCM2708_FB_DEBUG -@@ -429,6 +431,110 @@ static int bcm2708_fb_pan_display(struct - return result; - } - -+static void dma_memcpy(struct bcm2708_fb *fb, dma_addr_t dst, dma_addr_t src, int size) -+{ -+ int burst_size = (fb->dma_chan == 0) ? 8 : 2; -+ struct bcm2708_dma_cb *cb = fb->cb_base; -+ -+ cb->info = BCM2708_DMA_BURST(burst_size) | BCM2708_DMA_S_WIDTH | -+ BCM2708_DMA_S_INC | BCM2708_DMA_D_WIDTH | -+ BCM2708_DMA_D_INC | BCM2708_DMA_TDMODE; -+ cb->dst = dst; -+ cb->src = src; -+ cb->length = size; -+ cb->stride = 0; -+ cb->pad[0] = 0; -+ cb->pad[1] = 0; -+ cb->next = 0; -+ -+ if (size < dma_busy_wait_threshold) { -+ bcm_dma_start(fb->dma_chan_base, fb->cb_handle); -+ bcm_dma_wait_idle(fb->dma_chan_base); -+ } else { -+ void __iomem *dma_chan = fb->dma_chan_base; -+ cb->info |= BCM2708_DMA_INT_EN; -+ bcm_dma_start(fb->dma_chan_base, fb->cb_handle); -+ while (bcm_dma_is_busy(dma_chan)) { -+ wait_event_interruptible( -+ fb->dma_waitq, -+ !bcm_dma_is_busy(dma_chan)); -+ } -+ fb->stats.dma_irqs++; -+ } -+ fb->stats.dma_copies++; -+} -+ -+#define INTALIAS_NORMAL(x) ((x)&~0xc0000000) // address with no aliases -+#define INTALIAS_L1L2_NONALLOCATING(x) (((x)&~0xc0000000)|0x80000000) // cache coherent but non-allocating in L1 and L2 -+ -+static long vc_mem_copy(struct bcm2708_fb *fb, unsigned long arg) -+{ -+ struct fb_dmacopy ioparam; -+ size_t size = PAGE_SIZE; -+ u32 *buf = NULL; -+ dma_addr_t bus_addr; -+ long rc = 0; -+ size_t offset; -+ struct { u32 base, length; } gpu = {}; -+ -+ /* restrict this to root user */ -+ if (!uid_eq(current_euid(), GLOBAL_ROOT_UID)) -+ { -+ rc = -EFAULT; -+ goto out; -+ } -+ -+ /* Get the parameter data. -+ */ -+ if (copy_from_user -+ (&ioparam, (void *)arg, sizeof(ioparam)) != 0) { -+ pr_err("[%s]: failed to copy-from-user\n", -+ __func__); -+ rc = -EFAULT; -+ goto out; -+ } -+ -+ rc = rpi_firmware_property(fb->fw, -+ RPI_FIRMWARE_GET_VC_MEMORY, -+ &gpu, sizeof(gpu)); -+ if (rc != 0 || gpu.base == 0 || gpu.length == 0) { -+ pr_err("[%s]: Unable to determine gpu memory %ld,%x,%x)\n", __func__, rc, gpu.base, gpu.length); -+ return -EFAULT; -+ } -+ -+ if (INTALIAS_NORMAL(ioparam.src) < gpu.base || INTALIAS_NORMAL(ioparam.src) >= gpu.base + gpu.length) { -+ pr_err("[%s]: Invalid memory access %x (%x-%x)", __func__, INTALIAS_NORMAL(ioparam.src), gpu.base, gpu.base + gpu.length); -+ return -EFAULT; -+ } -+ -+ buf = dma_alloc_coherent(NULL, PAGE_ALIGN(size), &bus_addr, -+ GFP_ATOMIC); -+ if (!buf) { -+ pr_err("[%s]: failed to dma_alloc_coherent(%d)\n", -+ __func__, size); -+ rc = -ENOMEM; -+ goto out; -+ } -+ -+ for (offset = 0; offset < ioparam.length; offset += size) { -+ size_t remaining = ioparam.length - offset; -+ size_t s = min(size, remaining); -+ unsigned char *p = (unsigned char *)ioparam.src + offset; -+ unsigned char *q = (unsigned char *)ioparam.dst + offset; -+ dma_memcpy(fb, (dma_addr_t)buf, INTALIAS_L1L2_NONALLOCATING((dma_addr_t)p), size); -+ if (copy_to_user(q, buf, s) != 0) { -+ pr_err("[%s]: failed to copy-to-user\n", -+ __func__); -+ rc = -EFAULT; -+ goto out; -+ } -+ } -+out: -+ if (buf) -+ dma_free_coherent(NULL, PAGE_ALIGN(size), buf, bus_addr); -+ return rc; -+} -+ - static int bcm2708_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) - { - struct bcm2708_fb *fb = to_bcm2708(info); -@@ -441,6 +547,9 @@ static int bcm2708_ioctl(struct fb_info - RPI_FIRMWARE_FRAMEBUFFER_SET_VSYNC, - &dummy, sizeof(dummy)); - break; -+ case FBIODMACOPY: -+ ret = vc_mem_copy(fb, arg); -+ break; - default: - dev_dbg(info->device, "Unknown ioctl 0x%x\n", cmd); - return -ENOTTY; ---- a/include/uapi/linux/fb.h -+++ b/include/uapi/linux/fb.h -@@ -39,6 +39,7 @@ - * be concurrently added to the mainline kernel - */ - #define FBIOCOPYAREA _IOW('z', 0x21, struct fb_copyarea) -+#define FBIODMACOPY _IOW('z', 0x22, struct fb_dmacopy) - - #define FB_TYPE_PACKED_PIXELS 0 /* Packed Pixels */ - #define FB_TYPE_PLANES 1 /* Non interleaved planes */ -@@ -351,6 +352,12 @@ struct fb_copyarea { - __u32 sy; - }; - -+struct fb_dmacopy { -+ dma_addr_t dst; -+ dma_addr_t src; -+ __u32 length; -+}; -+ - struct fb_fillrect { - __u32 dx; /* screen-relative */ - __u32 dy; |