From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org, jejb@linux.ibm.com,
martin.petersen@oracle.com
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
linux-hyperv@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org, vkuznets@redhat.com,
thomas.lendacky@amd.com, brijesh.singh@amd.com,
sunilmut@microsoft.com
Subject: [RFC PATCH 12/12] HV/Storvsc: Add bounce buffer support for Storvsc
Date: Sun, 28 Feb 2021 10:03:15 -0500 [thread overview]
Message-ID: <20210228150315.2552437-13-ltykernel@gmail.com> (raw)
In-Reply-To: <20210228150315.2552437-1-ltykernel@gmail.com>
From: Tianyu Lan <Tianyu.Lan@microsoft.com>
Storvsc driver needs to reverse additional bounce
buffers to receive multipagebuffer packet and copy
data from brounce buffer when get response messge
from message.
Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Co-Developed-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
drivers/scsi/storvsc_drv.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index c5b4974eb41f..4ae8e2a427e4 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -33,6 +33,8 @@
#include <scsi/scsi_transport.h>
#include <asm/mshyperv.h>
+#include "../hv/hyperv_vmbus.h"
+
/*
* All wire protocol details (storage protocol between the guest and the host)
* are consolidated here.
@@ -725,6 +727,10 @@ static void handle_sc_creation(struct vmbus_channel *new_sc)
/* Add the sub-channel to the array of available channels. */
stor_device->stor_chns[new_sc->target_cpu] = new_sc;
cpumask_set_cpu(new_sc->target_cpu, &stor_device->alloced_cpus);
+
+ if (hv_bounce_resources_reserve(device->channel,
+ stor_device->max_transfer_bytes))
+ pr_warn("Fail to reserve bounce buffer\n");
}
static void handle_multichannel_storage(struct hv_device *device, int max_chns)
@@ -964,6 +970,18 @@ static int storvsc_channel_init(struct hv_device *device, bool is_fc)
stor_device->max_transfer_bytes =
vstor_packet->storage_channel_properties.max_transfer_bytes;
+ /*
+ * Reserve enough bounce resources to be able to support paging
+ * operations under low memory conditions, that cannot rely on
+ * additional resources to be allocated.
+ */
+ ret = hv_bounce_resources_reserve(device->channel,
+ stor_device->max_transfer_bytes);
+ if (ret < 0) {
+ pr_warn("Fail to reserve bounce buffer\n");
+ goto done;
+ }
+
if (!is_fc)
goto done;
@@ -1263,6 +1281,11 @@ static void storvsc_on_channel_callback(void *context)
request = (struct storvsc_cmd_request *)(unsigned long)cmd_rqst;
+ if (desc->type == VM_PKT_COMP && request->bounce_pkt) {
+ hv_pkt_bounce(channel, request->bounce_pkt);
+ request->bounce_pkt = NULL;
+ }
+
if (request == &stor_device->init_request ||
request == &stor_device->reset_request) {
memcpy(&request->vstor_packet, packet,
--
2.25.1
next prev parent reply other threads:[~2021-02-28 15:10 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-28 15:03 [RFC PATCH 00/12] x86/Hyper-V: Add Hyper-V Isolation VM support Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 1/12] x86/Hyper-V: Add visibility parameter for vmbus_establish_gpadl() Tianyu Lan
2021-03-03 16:27 ` Vitaly Kuznetsov
2021-03-05 6:06 ` Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 2/12] x86/Hyper-V: Add new hvcall guest address host visibility support Tianyu Lan
2021-03-03 16:58 ` Vitaly Kuznetsov
2021-03-05 6:23 ` Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 3/12] x86/HV: Initialize GHCB page and shared memory boundary Tianyu Lan
2021-03-03 17:05 ` Vitaly Kuznetsov
2021-02-28 15:03 ` [RFC PATCH 4/12] HV: Add Write/Read MSR registers via ghcb Tianyu Lan
2021-03-03 17:16 ` Vitaly Kuznetsov
2021-03-05 6:37 ` Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 5/12] HV: Add ghcb hvcall support for SNP VM Tianyu Lan
2021-03-03 17:21 ` Vitaly Kuznetsov
2021-03-05 15:21 ` Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 6/12] HV/Vmbus: Add SNP support for VMbus channel initiate message Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 7/12] hv/vmbus: Initialize VMbus ring buffer for Isolation VM Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 8/12] x86/Hyper-V: Initialize bounce buffer page cache and list Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 9/12] x86/Hyper-V: Add new parameter for vmbus_sendpacket_pagebuffer()/mpb_desc() Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 10/12] HV: Add bounce buffer support for Isolation VM Tianyu Lan
2021-02-28 15:03 ` [RFC PATCH 11/12] HV/Netvsc: Add Isolation VM support for netvsc driver Tianyu Lan
2021-02-28 15:03 ` Tianyu Lan [this message]
2021-03-01 6:54 ` [RFC PATCH 12/12] HV/Storvsc: Add bounce buffer support for Storvsc Christoph Hellwig
2021-03-01 13:43 ` Tianyu Lan
2021-03-01 19:45 ` [EXTERNAL] " Sunil Muthuswamy
2021-03-02 16:03 ` Tianyu Lan
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