From f65efd6dfe4e687637704f7023157fdee99913ca Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 20 Dec 2017 14:25:11 +0100 Subject: nvme-pci: clean up CMB initialization Refactor the call to nvme_map_cmb, and change the conditions for probing for the CMB. First remove the version check as NVMe TPs always apply to earlier versions of the spec as well. Second check for the whole CMBSZ register for support of the CMB feature instead of just the size field inside of it to simplify the code a bit. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Reviewed-by: Sagi Grimberg Reviewed-by: Logan Gunthorpe --- drivers/nvme/host/pci.c | 41 ++++++++++++++--------------------------- 1 file changed, 14 insertions(+), 27 deletions(-) (limited to 'drivers/nvme') diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 13057aee84e6..edb57e984865 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1651,21 +1651,20 @@ static ssize_t nvme_cmb_show(struct device *dev, } static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL); -static void __iomem *nvme_map_cmb(struct nvme_dev *dev) +static void nvme_map_cmb(struct nvme_dev *dev) { u64 szu, size, offset; resource_size_t bar_size; struct pci_dev *pdev = to_pci_dev(dev->dev); - void __iomem *cmb; int bar; dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); - if (!(NVME_CMB_SZ(dev->cmbsz))) - return NULL; + if (!dev->cmbsz) + return; dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC); if (!use_cmb_sqes) - return NULL; + return; szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); size = szu * NVME_CMB_SZ(dev->cmbsz); @@ -1674,7 +1673,7 @@ static void __iomem *nvme_map_cmb(struct nvme_dev *dev) bar_size = pci_resource_len(pdev, bar); if (offset > bar_size) - return NULL; + return; /* * Controllers may support a CMB size larger than their BAR, @@ -1684,13 +1683,16 @@ static void __iomem *nvme_map_cmb(struct nvme_dev *dev) if (size > bar_size - offset) size = bar_size - offset; - cmb = ioremap_wc(pci_resource_start(pdev, bar) + offset, size); - if (!cmb) - return NULL; - + dev->cmb = ioremap_wc(pci_resource_start(pdev, bar) + offset, size); + if (!dev->cmb) + return; dev->cmb_bus_addr = pci_bus_address(pdev, bar) + offset; dev->cmb_size = size; - return cmb; + + if (sysfs_add_file_to_group(&dev->ctrl.device->kobj, + &dev_attr_cmb.attr, NULL)) + dev_warn(dev->ctrl.device, + "failed to add sysfs attribute for CMB\n"); } static inline void nvme_release_cmb(struct nvme_dev *dev) @@ -2115,22 +2117,7 @@ static int nvme_pci_enable(struct nvme_dev *dev) "set queue depth=%u\n", dev->q_depth); } - /* - * CMBs can currently only exist on >=1.2 PCIe devices. We only - * populate sysfs if a CMB is implemented. Since nvme_dev_attrs_group - * has no name we can pass NULL as final argument to - * sysfs_add_file_to_group. - */ - - if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2, 0)) { - dev->cmb = nvme_map_cmb(dev); - if (dev->cmb) { - if (sysfs_add_file_to_group(&dev->ctrl.device->kobj, - &dev_attr_cmb.attr, NULL)) - dev_warn(dev->ctrl.device, - "failed to add sysfs attribute for CMB\n"); - } - } + nvme_map_cmb(dev); pci_enable_pcie_error_reporting(pdev); pci_save_state(pdev); -- cgit v1.2.3-58-ga151