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[PATCH v6 01/20] hw/block/nvme: fix pci doorbell size calculation
From: |
Klaus Jensen |
Subject: |
[PATCH v6 01/20] hw/block/nvme: fix pci doorbell size calculation |
Date: |
Thu, 14 May 2020 06:45:52 +0200 |
From: Klaus Jensen <address@hidden>
The size of the BAR is 0x1000 (main registers) + 8 bytes for each
queue. Currently, the size of the BAR is calculated like so:
n->reg_size = pow2ceil(0x1004 + 2 * (n->num_queues + 1) * 4);
Since the 'num_queues' parameter already accounts for the admin queue,
this should in any case not need to be incremented by one. Also, the
size should be initialized to (0x1000).
n->reg_size = pow2ceil(0x1000 + 2 * n->num_queues * 4);
This, with the default value of num_queues (64), we will set aside room
for 1 admin queue and 63 I/O queues (4 bytes per doorbell, 2 doorbells
per queue).
Signed-off-by: Klaus Jensen <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Reviewed-by: Maxim Levitsky <address@hidden>
Reviewed-by: Keith Busch <address@hidden>
---
hw/block/nvme.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 9b453423cf2c..1d7d7fb3c67a 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -54,6 +54,9 @@
#include "trace.h"
#include "nvme.h"
+#define NVME_REG_SIZE 0x1000
+#define NVME_DB_SIZE 4
+
#define NVME_GUEST_ERR(trace, fmt, ...) \
do { \
(trace_##trace)(__VA_ARGS__); \
@@ -1403,7 +1406,9 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
pcie_endpoint_cap_init(pci_dev, 0x80);
n->num_namespaces = 1;
- n->reg_size = pow2ceil(0x1004 + 2 * (n->num_queues + 1) * 4);
+
+ /* num_queues is really number of pairs, so each has two doorbells */
+ n->reg_size = pow2ceil(NVME_REG_SIZE + 2 * n->num_queues * NVME_DB_SIZE);
n->ns_size = bs_size / (uint64_t)n->num_namespaces;
n->namespaces = g_new0(NvmeNamespace, n->num_namespaces);
--
2.26.2
- [PATCH v6 00/20] nvme: small fixes, refactoring and cleanups, Klaus Jensen, 2020/05/14
- [PATCH v6 01/20] hw/block/nvme: fix pci doorbell size calculation,
Klaus Jensen <=
- [PATCH v6 03/20] hw/block/nvme: remove superfluous breaks, Klaus Jensen, 2020/05/14
- [PATCH v6 04/20] hw/block/nvme: move device parameters to separate struct, Klaus Jensen, 2020/05/14
- [PATCH v6 02/20] hw/block/nvme: rename trace events to pci_nvme, Klaus Jensen, 2020/05/14
- [PATCH v6 08/20] hw/block/nvme: allow use of any valid msix vector, Klaus Jensen, 2020/05/14
- [PATCH v6 09/20] hw/block/nvme: add max_ioqpairs device parameter, Klaus Jensen, 2020/05/14
- [PATCH v6 07/20] hw/block/nvme: fix pin-based interrupt behavior, Klaus Jensen, 2020/05/14