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misc: bcm-vk: add mmap function for exposing BAR2 

Add mmap function that allows host application to open up BAR2 memory
for remote spooling out messages from the VK logger.

Co-developed-by: Desmond Yan <desmond.yan@broadcom.com>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Desmond Yan <desmond.yan@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Link: https://lore.kernel.org/r/20210120175827.14820-12-scott.branden@broadcom.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Scott Branden 2021-01-20 09:58:25 -08:00 committed by Greg Kroah-Hartman
parent d63d658f74
commit 483050c047
1 changed files with 24 additions and 0 deletions
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24
drivers/misc/bcm-vk/bcm_vk_dev.c
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@ -1199,6 +1199,29 @@ err_exit:
return ret;
}
static int bcm_vk_mmap(struct file *file, struct vm_area_struct *vma)
{
struct bcm_vk_ctx *ctx = file->private_data;
struct bcm_vk *vk = container_of(ctx->miscdev, struct bcm_vk, miscdev);
unsigned long pg_size;
/* only BAR2 is mmap possible, which is bar num 4 due to 64bit */
#define VK_MMAPABLE_BAR 4
pg_size = ((pci_resource_len(vk->pdev, VK_MMAPABLE_BAR) - 1)
>> PAGE_SHIFT) + 1;
if (vma->vm_pgoff + vma_pages(vma) > pg_size)
return -EINVAL;
vma->vm_pgoff += (pci_resource_start(vk->pdev, VK_MMAPABLE_BAR)
>> PAGE_SHIFT);
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
static long bcm_vk_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
long ret = -EINVAL;
@ -1237,6 +1260,7 @@ static const struct file_operations bcm_vk_fops = {
.write = bcm_vk_write,
.poll = bcm_vk_poll,
.release = bcm_vk_release,
.mmap = bcm_vk_mmap,
.unlocked_ioctl = bcm_vk_ioctl,
};