scsi: vmbus: Add function to report available ring buffer to write in total ring size percentage (63273cb4) · Commits · 戴 / test

drivers/hv/ring_buffer.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -227,6 +227,8 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
		ring_info->ring_buffer->feature_bits.value = 1;

		ring_info->ring_size = page_cnt << PAGE_SHIFT;
		ring_info->ring_size_div10_reciprocal =
		reciprocal_value(ring_info->ring_size / 10);
		ring_info->ring_datasize = ring_info->ring_size -
		sizeof(struct hv_ring_buffer);

+12 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,7 @@
		#include <linux/device.h>
		#include <linux/mod_devicetable.h>
		#include <linux/interrupt.h>
		#include <linux/reciprocal_div.h>

		#define MAX_PAGE_BUFFER_COUNT 32
		#define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
		@@ -120,6 +121,7 @@ struct hv_ring_buffer {
		struct hv_ring_buffer_info {
		struct hv_ring_buffer *ring_buffer;
		u32 ring_size; /* Include the shared header */
		struct reciprocal_value ring_size_div10_reciprocal;
		spinlock_t ring_lock;

		u32 ring_datasize; /* < ring_size */
		@@ -154,6 +156,16 @@ static inline u32 hv_get_bytes_to_write(const struct hv_ring_buffer_info *rbi)
		return write;
		}

		static inline u32 hv_get_avail_to_write_percent(
		const struct hv_ring_buffer_info *rbi)
		{
		u32 avail_write = hv_get_bytes_to_write(rbi);

		return reciprocal_divide(
		(avail_write << 3) + (avail_write << 1),
		rbi->ring_size_div10_reciprocal);
		}

		/*
		* VMBUS version is 32 bit entity broken up into
		* two 16 bit quantities: major_number. minor_number.