misc: bcm-vk: add open/release
Add open/release to replace private data with context for other methods
to use. Reason for the context is because it is allowed for multiple
sessions to open sysfs. For each file open, when upper layer queries the
response, only those that are tied to a specified open should be returned.
Co-developed-by: Desmond Yan <[email protected]>
Acked-by: Olof Johansson <[email protected]>
Signed-off-by: Desmond Yan <[email protected]>
Signed-off-by: Scott Branden <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
diff --git a/drivers/misc/bcm-vk/bcm_vk_msg.h b/drivers/misc/bcm-vk/bcm_vk_msg.h
new file mode 100644
index 0000000..32516ab
--- /dev/null
+++ b/drivers/misc/bcm-vk/bcm_vk_msg.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright 2018-2020 Broadcom.
+ */
+
+#ifndef BCM_VK_MSG_H
+#define BCM_VK_MSG_H
+
+/* context per session opening of sysfs */
+struct bcm_vk_ctx {
+ struct list_head node; /* use for linkage in Hash Table */
+ unsigned int idx;
+ bool in_use;
+ pid_t pid;
+ u32 hash_idx;
+ struct miscdevice *miscdev;
+};
+
+/* pid hash table entry */
+struct bcm_vk_ht_entry {
+ struct list_head head;
+};
+
+/* total number of supported ctx, 32 ctx each for 5 components */
+#define VK_CMPT_CTX_MAX (32 * 5)
+
+/* hash table defines to store the opened FDs */
+#define VK_PID_HT_SHIFT_BIT 7 /* 128 */
+#define VK_PID_HT_SZ BIT(VK_PID_HT_SHIFT_BIT)
+
+#endif
