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Y . Srinivasan" , Haiyang Zhang , Stephen Hemminger , "James E . J . Bottomley" , "Martin K . Petersen" , devel@linuxdriverproject.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Long Li Subject: [PATCH 1/3] Vmbus: Add function to report available ring buffer to write in total ring size percentage Date: Thu, 22 Mar 2018 17:15:36 -0700 Message-Id: <20180323001538.31876-1-longli@linuxonhyperv.com> X-Mailer: git-send-email 2.15.1 X-CMAE-Envelope: MS4wfOMlhT6CUbBhekVNpPBE852wfm96Z32mMVTFv9G2RIOWmdiHTCNC9fUYp20cjpmEhkKoRJ2ZQtgV1tv4Ff3qIwjdmkh37K8IAmVjVBBUj/u6gqEQeAsj ngaZ6lrmL0XJE6SrX6KjCzds5wQavQcz03Knn2HNnHqoG4V7DZg+3DSYN/St2Knohyvt+FqkxzLqdtUaCyhSUp0hGM0rkhsRJFomMWEAFqe5j8TsM8Is6VId 0jfMyrJKM+t3IpBPJRK1jMtKM039cViX23sNu7T/fsPCL299RTSQLhIJNKibp1twhFx29Z8dkr7MqDZzeINLeNarNt+dkGLB7o30/98xiyOFU6y+URGx2I31 f8l/zxlGsrMecltHEIbG89B+mhooukh9Ir1SBQXcvfceI1Fw07VjHlwotDU7ygWHRTtTbnrH4Lbz69RcwbYRIRVi+bdRr6S5h8kyInqjgADDyxfcRDJMIZq9 9Ql4vg9ulCHg2/l+VRm6LhEccRDlHdfuuekMSvj8a+i6XRxRvc4I+iq86VY= Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Long Li Netvsc has a similar function to calculate how much ring buffer in percentage is available to write. This function is useful for storvsc and other vmbus devices. Define a similar function in vmbus to be used by storvsc. Signed-off-by: Long Li --- drivers/hv/ring_buffer.c | 2 ++ include/linux/hyperv.h | 12 ++++++++++++ 2 files changed, 14 insertions(+) diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c index 8699bb969e7e..3c836c099a8f 100644 --- a/drivers/hv/ring_buffer.c +++ b/drivers/hv/ring_buffer.c @@ -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); diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 2048f3c3b68a..eb7204851089 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -36,6 +36,7 @@ #include #include #include +#include #define MAX_PAGE_BUFFER_COUNT 32 #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */ @@ -121,6 +122,7 @@ 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 */ @@ -155,6 +157,16 @@ 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. -- 2.14.1