From: Scott Branden <scott.branden@broadcom.com>
To: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Scott Branden <scott.branden@broadcom.com>,
Desmond Yan <desmond.yan@broadcom.com>
Cc: Kees Cook <keescook@chromium.org>,
linux-kernel@vger.kernel.org,
bcm-kernel-feedback-list@broadcom.com,
Olof Johansson <olof@lixom.net>
Subject: [PATCH v7 11/13] misc: bcm-vk: add mmap function for exposing BAR2
Date: Tue, 17 Nov 2020 15:23:18 -0800 [thread overview]
Message-ID: <20201117232320.4958-12-scott.branden@broadcom.com> (raw)
In-Reply-To: <20201117232320.4958-1-scott.branden@broadcom.com>
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>
Signed-off-by: Desmond Yan <desmond.yan@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
drivers/misc/bcm-vk/bcm_vk_dev.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
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 @@ static long bcm_vk_reset(struct bcm_vk *vk, struct vk_reset __user *arg)
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,
};
--
2.17.1
next prev parent reply other threads:[~2020-11-17 23:25 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 23:23 [PATCH v7 00/13] Add Broadcom VK driver Scott Branden
2020-11-17 23:23 ` [PATCH v7 01/13] bcm-vk: add bcm_vk UAPI Scott Branden
2020-11-17 23:23 ` [PATCH v7 02/13] misc: bcm-vk: add Broadcom VK driver Scott Branden
2020-11-19 22:42 ` Pavel Machek
2020-11-19 23:16 ` Scott Branden
2020-11-17 23:23 ` [PATCH v7 03/13] misc: bcm-vk: add autoload support Scott Branden
2020-11-17 23:23 ` [PATCH v7 04/13] misc: bcm-vk: add misc device to Broadcom VK driver Scott Branden
2020-11-17 23:23 ` [PATCH v7 05/13] misc: bcm-vk: add triggers when host panic or reboots to notify card Scott Branden
2020-11-17 23:23 ` [PATCH v7 06/13] misc: bcm-vk: add open/release Scott Branden
2020-11-17 23:23 ` [PATCH v7 07/13] misc: bcm-vk: add ioctl load_image Scott Branden
2020-11-17 23:23 ` [PATCH v7 08/13] misc: bcm-vk: add get_card_info, peerlog_info, and proc_mon_info Scott Branden
2020-11-17 23:23 ` [PATCH v7 09/13] misc: bcm-vk: add VK messaging support Scott Branden
2020-11-17 23:23 ` [PATCH v7 10/13] misc: bcm-vk: reset_pid support Scott Branden
2020-11-17 23:23 ` Scott Branden [this message]
2020-11-17 23:23 ` [PATCH v7 12/13] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver Scott Branden
2020-11-17 23:23 ` [PATCH v7 13/13] misc: bcm-vk: add ttyVK support Scott Branden
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