[PULL 06/15] hw/nvme: Remove reg_size variable and update BAR0 size calculation

From: Klaus Jensen <its@irrelevant.dk>
To: Peter Maydell <peter.maydell@linaro.org>, qemu-devel@nongnu.org
Cc: "Stefan Hajnoczi" <stefanha@redhat.com>,
	"Igor Mammedov" <imammedo@redhat.com>,
	"Ani Sinha" <ani@anisinha.ca>, "Hanna Reitz" <hreitz@redhat.com>,
	"Kevin Wolf" <kwolf@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Klaus Jensen" <its@irrelevant.dk>,
	qemu-block@nongnu.org, "Keith Busch" <kbusch@kernel.org>,
	"Fam Zheng" <fam@euphon.net>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	"Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>,
	"Łukasz Gieryk" <lukasz.gieryk@linux.intel.com>,
	"Klaus Jensen" <k.jensen@samsung.com>
Subject: [PULL 06/15] hw/nvme: Remove reg_size variable and update BAR0 size calculation
Date: Thu, 23 Jun 2022 23:34:33 +0200	[thread overview]
Message-ID: <20220623213442.67789-7-its@irrelevant.dk> (raw)
In-Reply-To: <20220623213442.67789-1-its@irrelevant.dk>

From: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>

The n->reg_size parameter unnecessarily splits the BAR0 size calculation
in two phases; removed to simplify the code.

With all the calculations done in one place, it seems the pow2ceil,
applied originally to reg_size, is unnecessary. The rounding should
happen as the last step, when BAR size includes Nvme registers, queue
registers, and MSIX-related space.

Finally, the size of the mmio memory region is extended to cover the 1st
4KiB padding (see the map below). Access to this range is handled as
interaction with a non-existing queue and generates an error trace, so
actually nothing changes, while the reg_size variable is no longer needed.

    --------------------
    |      BAR0        |
    --------------------
    [Nvme Registers    ]
    [Queues            ]
    [power-of-2 padding] - removed in this patch
    [4KiB padding (1)  ]
    [MSIX TABLE        ]
    [4KiB padding (2)  ]
    [MSIX PBA          ]
    [power-of-2 padding]

Signed-off-by: Łukasz Gieryk <lukasz.gieryk@linux.intel.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/nvme/ctrl.c | 10 +++++-----
 hw/nvme/nvme.h |  1 -
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/hw/nvme/ctrl.c b/hw/nvme/ctrl.c
index e970234a2c87..9f07a730d341 100644
--- a/hw/nvme/ctrl.c
+++ b/hw/nvme/ctrl.c
@@ -6671,9 +6671,6 @@ static void nvme_init_state(NvmeCtrl *n)
     n->conf_ioqpairs = n->params.max_ioqpairs;
     n->conf_msix_qsize = n->params.msix_qsize;
 
-    /* add one to max_ioqpairs to account for the admin queue pair */
-    n->reg_size = pow2ceil(sizeof(NvmeBar) +
-                           2 * (n->params.max_ioqpairs + 1) * NVME_DB_SIZE);
     n->sq = g_new0(NvmeSQueue *, n->params.max_ioqpairs + 1);
     n->cq = g_new0(NvmeCQueue *, n->params.max_ioqpairs + 1);
     n->temperature = NVME_TEMPERATURE;
@@ -6797,7 +6794,10 @@ static int nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
         pcie_ari_init(pci_dev, 0x100, 1);
     }
 
-    bar_size = QEMU_ALIGN_UP(n->reg_size, 4 * KiB);
+    /* add one to max_ioqpairs to account for the admin queue pair */
+    bar_size = sizeof(NvmeBar) +
+               2 * (n->params.max_ioqpairs + 1) * NVME_DB_SIZE;
+    bar_size = QEMU_ALIGN_UP(bar_size, 4 * KiB);
     msix_table_offset = bar_size;
     msix_table_size = PCI_MSIX_ENTRY_SIZE * n->params.msix_qsize;
 
@@ -6811,7 +6811,7 @@ static int nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
 
     memory_region_init(&n->bar0, OBJECT(n), "nvme-bar0", bar_size);
     memory_region_init_io(&n->iomem, OBJECT(n), &nvme_mmio_ops, n, "nvme",
-                          n->reg_size);
+                          msix_table_offset);
     memory_region_add_subregion(&n->bar0, 0, &n->iomem);
 
     if (pci_is_vf(pci_dev)) {
diff --git a/hw/nvme/nvme.h b/hw/nvme/nvme.h
index aab4962fb857..d9deb0b1ec43 100644
--- a/hw/nvme/nvme.h
+++ b/hw/nvme/nvme.h
@@ -429,7 +429,6 @@ typedef struct NvmeCtrl {
     uint16_t    max_prp_ents;
     uint16_t    cqe_size;
     uint16_t    sqe_size;
-    uint32_t    reg_size;
     uint32_t    max_q_ents;
     uint8_t     outstanding_aers;
     uint32_t    irq_status;
-- 
2.36.1


