nvme: add quirk to force medium priority for SQ creation

commit 9abd68ef454c824bfd18629033367b4382b5f390 upstream.

Some P3100 drives have a bug where they think WRRU (weighted round robin)
is always enabled, even though the host doesn't set it. Since they think
it's enabled, they also look at the submission queue creation priority. We
used to set that to MEDIUM by default, but that was removed in commit
81c1cd98351b. This causes various issues on that drive. Add a quirk to
still set MEDIUM priority for that controller.

Fixes: 81c1cd98351b ("nvme/pci: Don't set reserved SQ create flags")
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index d733b14ede9dc10022e0ae14da8cb4550c46831b..013380641ddfabab8eb8bb290ac60f059859dfbe 100644 (file)
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -83,6 +83,11 @@ enum nvme_quirks {
         * Supports the LighNVM command set if indicated in vs[1].
         */
        NVME_QUIRK_LIGHTNVM                     = (1 << 6),
+
+       /*
+        * Set MEDIUM priority on SQ creation
+        */
+       NVME_QUIRK_MEDIUM_PRIO_SQ               = (1 << 7),
 };
 
 /*

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index b6f43b738f03ae3b6008cd188d467623c1e70ecf..f6648610d1530cbc962a00c182b16a4e2ade5e31 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1091,9 +1091,18 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid,
 static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid,
                                                struct nvme_queue *nvmeq)
 {
+       struct nvme_ctrl *ctrl = &dev->ctrl;
        struct nvme_command c;
        int flags = NVME_QUEUE_PHYS_CONTIG;
 
+       /*
+        * Some drives have a bug that auto-enables WRRU if MEDIUM isn't
+        * set. Since URGENT priority is zeroes, it makes all queues
+        * URGENT.
+        */
+       if (ctrl->quirks & NVME_QUIRK_MEDIUM_PRIO_SQ)
+               flags |= NVME_SQ_PRIO_MEDIUM;
+
        /*
         * Note: we (ab)use the fact that the prp fields survive if no data
         * is attached to the request.
@@ -2684,7 +2693,8 @@ static const struct pci_device_id nvme_id_table[] = {
                .driver_data = NVME_QUIRK_STRIPE_SIZE |
                                NVME_QUIRK_DEALLOCATE_ZEROES, },
        { PCI_VDEVICE(INTEL, 0xf1a5),   /* Intel 600P/P3100 */
-               .driver_data = NVME_QUIRK_NO_DEEPEST_PS },
+               .driver_data = NVME_QUIRK_NO_DEEPEST_PS |
+                               NVME_QUIRK_MEDIUM_PRIO_SQ },
        { PCI_VDEVICE(INTEL, 0x5845),   /* Qemu emulated controller */
                .driver_data = NVME_QUIRK_IDENTIFY_CNS, },
        { PCI_DEVICE(0x1c58, 0x0003),   /* HGST adapter */