diff options
| author | Scott Branden <scott.branden@broadcom.com> | 2021-01-20 18:58:25 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-01-25 18:44:45 +0100 |
| commit | 483050c04738c685e3982c1baec202d0cc1beb0d (patch) | |
| tree | 43783ab5321d9cd85b1ea31415a06d2270ab2f0d /drivers/misc | |
| parent | misc: bcm-vk: reset_pid support (diff) | |
| download | linux-483050c04738c685e3982c1baec202d0cc1beb0d.tar.xz linux-483050c04738c685e3982c1baec202d0cc1beb0d.zip | |
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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/bcm-vk/bcm_vk_dev.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/misc/bcm-vk/bcm_vk_dev.c b/drivers/misc/bcm-vk/bcm_vk_dev.c index e572a7b18fab..cac07419f041 100644 --- a/drivers/misc/bcm-vk/bcm_vk_dev.c +++ b/drivers/misc/bcm-vk/bcm_vk_dev.c @@ -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, }; |