search for: remap_pfn_range

...can perform bus master DMA. I developed a PCI device driver which can allocate DMA buffer and provide mmap operation to map the I/O and DMA buffer to user space. The PCI device driver works well under Linux 2.6.20. However it brokes under XEN 3.0.4. It appears that mmap map to the wrong memory. remap_pfn_range in mmap function return no error when it is used to map both I/O and DMA buffer. If I use io_remap_pfn_range instead of remap_pfn_range, I/O mapping works but DMA buffer mapping return -1. Is this a known problem for XEN 3.0.4 and will be fixed later? Is there any alternative way to map the DM...

...gt; 750 u16 index = vma->vm_pgoff; >>>> 751 >>>> 752 notify = ops->get_vq_notification(vdpa, index); >>>> 753 >>>> > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); >>>> 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, >>>> 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, >>>> 757 vma->vm_page_prot)) >>>> 758 return VM_FAULT_SIGBUS; >>>> 759 >>>> 760 return VM_FAULT_NOPAGE...

...gt; 750 u16 index = vma->vm_pgoff; >>>> 751 >>>> 752 notify = ops->get_vq_notification(vdpa, index); >>>> 753 >>>> > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); >>>> 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, >>>> 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, >>>> 757 vma->vm_page_prot)) >>>> 758 return VM_FAULT_SIGBUS; >>>> 759 >>>> 760 return VM_FAULT_NOPAGE...

...truct vm_area_struct *vma = vmf->vma; >> 750 u16 index = vma->vm_pgoff; >> 751 >> 752 notify = ops->get_vq_notification(vdpa, index); >> 753 >> > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); >> 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, >> 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, >> 757 vma->vm_page_prot)) >> 758 return VM_FAULT_SIGBUS; >> 759 >> 760 return VM_FAULT_NOPAGE; >> 761 } >> 762 > Y...

...truct vm_area_struct *vma = vmf->vma; >> 750 u16 index = vma->vm_pgoff; >> 751 >> 752 notify = ops->get_vq_notification(vdpa, index); >> 753 >> > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); >> 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, >> 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, >> 757 vma->vm_page_prot)) >> 758 return VM_FAULT_SIGBUS; >> 759 >> 760 return VM_FAULT_NOPAGE; >> 761 } >> 762 > Y...

...vma; > > > 750 u16 index = vma->vm_pgoff; > > > 751 > > > 752 notify = ops->get_vq_notification(vdpa, index); > > > 753 > > > > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > > > 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, > > > 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, > > > 757 vma->vm_page_prot)) > > > 758 return VM_FAULT_SIGBUS; > > > 759 > > > 760 return VM_FAULT_NOPAGE; > > &gt...

...ff; > > > > > 751 > > > > > 752 notify = ops->get_vq_notification(vdpa, index); > > > > > 753 > > > > > > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > > > > > 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, > > > > > 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, > > > > > 757 vma->vm_page_prot)) > > > > > 758 return VM_FAULT_SIGBUS; > > > > > 759 > > > &g...

...fig; 748 struct vdpa_notification_area notify; 749 struct vm_area_struct *vma = vmf->vma; 750 u16 index = vma->vm_pgoff; 751 752 notify = ops->get_vq_notification(vdpa, index); 753 > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, 757 vma->vm_page_prot)) 758 return VM_FAULT_SIGBUS; 759 760 return VM_FAULT_NOPAGE; 761 } 762 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hy...

...fig; 748 struct vdpa_notification_area notify; 749 struct vm_area_struct *vma = vmf->vma; 750 u16 index = vma->vm_pgoff; 751 752 notify = ops->get_vq_notification(vdpa, index); 753 > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, 757 vma->vm_page_prot)) 758 return VM_FAULT_SIGBUS; 759 760 return VM_FAULT_NOPAGE; 761 } 762 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hy...

direct_remap_pfn_range() does not properly mark vma with VM_PFNMAP. This triggers improper reference counting on what rmap thought was a normal page, and a subsequent BUG() such as: Eeek! page_mapcount(page) went negative! (-1) page->flags = 414 page->count = 1 page->mapping = 00000000 ------------[ cut h...

...57.817723] 1 multicall(s) failed: cpu 0 [ 357.820021] Pid: 636, comm: map_dpm Not tainted 2.6.32-5-xen-686 #1 [ 357.820021] Call Trace: [ 357.820021] [<c10042e5>] ? xen_mc_flush+0xa2/0x150 [ 357.820021] [<c1005051>] ? xen_leave_lazy_mmu+0x5/0xa [ 357.820021] [<c10a4910>] ? remap_pfn_range+0x286/0x303 [ 357.820021] [<c892846e>] ? uio_mmap+0xbc/0xe1 [uio] [ 357.820021] [<c10a81ed>] ? mmap_region+0x267/0x443 [ 357.820021] [<c109e10a>] ? sys_mmap_pgoff+0xc8/0x147 [ 357.820021] [<c128fb5c>] ? do_debug+0x117/0x126 [ 357.820021] [<c1008f7c>] ? syscal...

...vdpa_notification_area notify; > + struct vm_area_struct *vma = vmf->vma; > + u16 index = vma->vm_pgoff; > + > + notify = ops->get_vq_notification(vdpa, index); > + > + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > + if (remap_pfn_range(vma, vmf->address & PAGE_MASK, > + notify.addr >> PAGE_SHIFT, PAGE_SIZE, > + vma->vm_page_prot)) > + return VM_FAULT_SIGBUS; > + > + return VM_FAULT_NOPAGE; > +} > + > +static const struc...

...;vm_page_prot = pgprot_noncached(vma->vm_page_prot); > + vma->vm_page_prot = ops->get_vq_notification_pgprot ? > + ops->get_vq_notification_pgprot(vdpa, index, vma->vm_page_prot) : > + pgprot_noncached(vma->vm_page_prot); > if (remap_pfn_range(vma, vmf->address & PAGE_MASK, > PFN_DOWN(notify.addr), PAGE_SIZE, > vma->vm_page_prot)) > diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h > index 6d0f5e4e82c2..07fcf5e6abc8 100644 > --- a/include/linux/vdpa.h...

...on_area notify; > 749 struct vm_area_struct *vma = vmf->vma; > 750 u16 index = vma->vm_pgoff; > 751 > 752 notify = ops->get_vq_notification(vdpa, index); > 753 > > 754 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); > 755 if (remap_pfn_range(vma, vmf->address & PAGE_MASK, > 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, > 757 vma->vm_page_prot)) > 758 return VM_FAULT_SIGBUS; > 759 > 760 return VM_FAULT_NOPAGE; > 761 } > 762 Yes well, all this remapping clearly has...

...+ const struct vdpa_config_ops *ops = vdpa->config; + struct vdpa_notification_area notify; + struct vm_area_struct *vma = vmf->vma; + u16 index = vma->vm_pgoff; + + notify = ops->get_vq_notification(vdpa, index); + + vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); + if (remap_pfn_range(vma, vmf->address & PAGE_MASK, + notify.addr >> PAGE_SHIFT, PAGE_SIZE, + vma->vm_page_prot)) + return VM_FAULT_SIGBUS; + + return VM_FAULT_NOPAGE; +} + +static const struct vm_operations_struct vhost_vdpa_vm_ops = { + .fault = vhost_vdpa_fault, +}; + +static int vhost_v...

...tion_area notify; >> +??? struct vm_area_struct *vma = vmf->vma; >> +??? u16 index = vma->vm_pgoff; >> + >> +??? notify = ops->get_vq_notification(vdpa, index); >> + >> +??? vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); >> +??? if (remap_pfn_range(vma, vmf->address & PAGE_MASK, >> +??????????????? notify.addr >> PAGE_SHIFT, PAGE_SIZE, >> +??????????????? vma->vm_page_prot)) >> +??????? return VM_FAULT_SIGBUS; >> + >> +??? return VM_FAULT_NOPAGE; >> +} >> + >> +static const struc...

...erencing pointer to incomplete type /usr/src/zaptel-1.4.0/zttranscode.c:378: error: dereferencing pointer to incomplete type /usr/src/zaptel-1.4.0/zttranscode.c:378: error: dereferencing pointer to incomplete type /usr/src/zaptel-1.4.0/zttranscode.c:384: error: implicit declaration of function 'remap_pfn_range' /usr/src/zaptel-1.4.0/zttranscode.c:384: error: dereferencing pointer to incomplete type /usr/src/zaptel-1.4.0/zttranscode.c:384: error: 'PAGE_SHARED' undeclared (first use in this function) /usr/src/zaptel-1.4.0/zttranscode.c:384: error: (Each undeclared identifier is reported only on...

Hi all: This series introduce basic functionality of doorbell mapping support for vhost-vDPA. Userspace program may use mmap() to map a the doorbell of a specific virtqueue into its address space. This is help to reudce the syscall or vmexit overhead. A new vdpa_config_ops was introduced to report the location of the doorbell, vhost_vdpa may then choose to map the doorbell when: - The doorbell

Hi all: This series introduce basic functionality of doorbell mapping support for vhost-vDPA. Userspace program may use mmap() to map a the doorbell of a specific virtqueue into its address space. This is help to reudce the syscall or vmexit overhead. A new vdpa_config_ops was introduced to report the location of the doorbell, vhost_vdpa may then choose to map the doorbell when: - The doorbell

Hi everyone, I am very excited to see that dom0 pvops is finally coming close to working, so I wanted to give it a try. >From the description it was not clear to me which kernel to chose as base for the patches.hg, so I took the latest (that was ~ 2 weeks ago) kernel on git.kernel.org I could find (post-2.6.28 git tip at that point). I managed to more or less apply all of the patches in the