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[PATCH-for-5.2,v2,14/25] block/nvme: Correctly initialize Admin Queue Attributes

Message ID 20201029093306.1063879-15-philmd@redhat.com (mailing list archive)
State New, archived
Headers show
Series block/nvme: Fix Aarch64 or big-endian hosts | expand

Commit Message

Philippe Mathieu-Daudé Oct. 29, 2020, 9:32 a.m. UTC 
From the specification chapter 3.1.8 "AQA - Admin Queue Attributes"
the Admin Submission Queue Size field is a 0’s based value:

  Admin Submission Queue Size (ASQS):

    Defines the size of the Admin Submission Queue in entries.
    Enabling a controller while this field is cleared to 00h
    produces undefined results. The minimum size of the Admin
    Submission Queue is two entries. The maximum size of the
    Admin Submission Queue is 4096 entries.
    This is a 0’s based value.

This bug has never been hit because the device initialization
uses a single command synchronously :)

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 block/nvme.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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Patch

diff --git a/block/nvme.c b/block/nvme.c
index 7285bd2e271..0902aa55428 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -789,9 +789,9 @@  static int nvme_init(BlockDriverState *bs, const char *device, int namespace,
         goto out;
     }
     s->queue_count = 1;
-    QEMU_BUILD_BUG_ON(NVME_QUEUE_SIZE & 0xF000);
-    regs->aqa = cpu_to_le32((NVME_QUEUE_SIZE << AQA_ACQS_SHIFT) |
-                            (NVME_QUEUE_SIZE << AQA_ASQS_SHIFT));
+    QEMU_BUILD_BUG_ON((NVME_QUEUE_SIZE - 1) & 0xF000);
+    regs->aqa = cpu_to_le32(((NVME_QUEUE_SIZE - 1) << AQA_ACQS_SHIFT) |
+                            ((NVME_QUEUE_SIZE - 1) << AQA_ASQS_SHIFT));
     regs->asq = cpu_to_le64(s->queues[INDEX_ADMIN]->sq.iova);
     regs->acq = cpu_to_le64(s->queues[INDEX_ADMIN]->cq.iova);