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author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
commit | fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 (patch) | |
tree | 22962a4387943edc841c72a4e636a068c66d58fd /drivers/usb/mon/mon_dma.c | |
download | ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.zip ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.tar.gz |
Initial import of modified Linux 2.6.28 tree
Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
Diffstat (limited to 'drivers/usb/mon/mon_dma.c')
-rw-r--r-- | drivers/usb/mon/mon_dma.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/usb/mon/mon_dma.c b/drivers/usb/mon/mon_dma.c new file mode 100644 index 0000000..140cc80 --- /dev/null +++ b/drivers/usb/mon/mon_dma.c @@ -0,0 +1,95 @@ +/* + * 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 */ |