USB: usbmon: end ugly tricks with DMA peeking

This patch fixes crashes when usbmon attempts to access GART aperture.
The old code attempted to take a bus address and convert it into a
virtual address, which clearly was impossible on systems with actual
IOMMUs. Let us not persist in this foolishness, and use transfer_buffer
in all cases instead.

I think downsides are negligible. The ones I see are:
 - A driver may pass an address of one buffer down as transfer_buffer,
   and entirely different entity mapped for DMA, resulting in misleading
   output of usbmon. Note, however, that PIO based controllers would
   do transfer the same data that usbmon sees here.
 - Out of tree drivers may crash usbmon if they store garbage in
   transfer_buffer. I inspected the in-tree drivers, and clarified
   the documentation in comments.
 - Drivers that use get_user_pages will not be possible to monitor.
   I only found one driver with this problem (drivers/staging/rspiusb).
 - Same happens with with usb_storage transferring from highmem, but
   it works fine on 64-bit systems, so I think it's not a concern.
   At least we don't crash anymore.

Why didn't we do this in 2.6.10? That's because back in those days
it was popular not to fill in transfer_buffer, so almost all
traffic would be invisible (e.g. all of HID was like that).
But now, the tree is almost 100% PIO friendly, so we can do the
right thing at last.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 95 deletions

diff --git a/drivers/usb/mon/mon_dma.c b/drivers/usb/mon/mon_dma.c
deleted file mode 100644
index 140cc80bd2b1..000000000000
--- a/drivers/usb/mon/mon_dma.c
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * The USB Monitor, inspired by Dave Harding's USBMon.
- *
- * mon_dma.c: Library which snoops on DMA areas.
- *
- * Copyright (C) 2005 Pete Zaitcev (zaitcev@redhat.com)
- */
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/highmem.h>
-#include <asm/page.h>
-
-#include <linux/usb.h>	/* Only needed for declarations in usb_mon.h */
-#include "usb_mon.h"
-
-/*
- * PC-compatibles, are, fortunately, sufficiently cache-coherent for this.
- */
-#if defined(__i386__) || defined(__x86_64__) /* CONFIG_ARCH_I386 doesn't exit */
-#define MON_HAS_UNMAP 1
-
-#define phys_to_page(phys)	pfn_to_page((phys) >> PAGE_SHIFT)
-
-char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len)
-{
-	struct page *pg;
-	unsigned long flags;
-	unsigned char *map;
-	unsigned char *ptr;
-
-	/*
-	 * On i386, a DMA handle is the "physical" address of a page.
-	 * In other words, the bus address is equal to physical address.
-	 * There is no IOMMU.
-	 */
-	pg = phys_to_page(dma_addr);
-
-	/*
-	 * We are called from hardware IRQs in case of callbacks.
-	 * But we can be called from softirq or process context in case
-	 * of submissions. In such case, we need to protect KM_IRQ0.
-	 */
-	local_irq_save(flags);
-	map = kmap_atomic(pg, KM_IRQ0);
-	ptr = map + (dma_addr & (PAGE_SIZE-1));
-	memcpy(dst, ptr, len);
-	kunmap_atomic(map, KM_IRQ0);
-	local_irq_restore(flags);
-	return 0;
-}
-
-void mon_dmapeek_vec(const struct mon_reader_bin *rp,
-    unsigned int offset, dma_addr_t dma_addr, unsigned int length)
-{
-	unsigned long flags;
-	unsigned int step_len;
-	struct page *pg;
-	unsigned char *map;
-	unsigned long page_off, page_len;
-
-	local_irq_save(flags);
-	while (length) {
-		/* compute number of bytes we are going to copy in this page */
-		step_len = length;
-		page_off = dma_addr & (PAGE_SIZE-1);
-		page_len = PAGE_SIZE - page_off;
-		if (page_len < step_len)
-			step_len = page_len;
-
-		/* copy data and advance pointers */
-		pg = phys_to_page(dma_addr);
-		map = kmap_atomic(pg, KM_IRQ0);
-		offset = mon_copy_to_buff(rp, offset, map + page_off, step_len);
-		kunmap_atomic(map, KM_IRQ0);
-		dma_addr += step_len;
-		length -= step_len;
-	}
-	local_irq_restore(flags);
-}
-
-#endif /* __i386__ */
-
-#ifndef MON_HAS_UNMAP
-char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len)
-{
-	return 'D';
-}
-
-void mon_dmapeek_vec(const struct mon_reader_bin *rp,
-    unsigned int offset, dma_addr_t dma_addr, unsigned int length)
-{
-	;
-}
-
-#endif /* MON_HAS_UNMAP */