diff options
| author | Klaus Jensen | 2021-01-15 07:30:46 +0100 |
|---|---|---|
| committer | Christoph Hellwig | 2021-01-18 18:58:18 +0100 |
| commit | 20d3bb92e84d417b0494a3b6867f0c86713db257 (patch) | |
| tree | 7c0dab73f2fcafe745c8498e51a43f271f15fa32 /drivers/nvme/host/pci.c | |
| parent | 9ebbfe495ecd2e51bc92ac21ed5817c3b9e223ce (diff) | |
nvme-pci: allow use of cmb on v1.4 controllers
Since NVMe v1.4 the Controller Memory Buffer must be explicitly enabled
by the host.
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
[hch: avoid a local variable and add a comment]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme/host/pci.c')
| -rw-r--r-- | drivers/nvme/host/pci.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 50d9a20568a2..25456d02eddb 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -23,6 +23,7 @@ #include <linux/t10-pi.h> #include <linux/types.h> #include <linux/io-64-nonatomic-lo-hi.h> +#include <linux/io-64-nonatomic-hi-lo.h> #include <linux/sed-opal.h> #include <linux/pci-p2pdma.h> @@ -1795,6 +1796,9 @@ static void nvme_map_cmb(struct nvme_dev *dev) if (dev->cmb_size) return; + if (NVME_CAP_CMBS(dev->ctrl.cap)) + writel(NVME_CMBMSC_CRE, dev->bar + NVME_REG_CMBMSC); + dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); if (!dev->cmbsz) return; @@ -1809,6 +1813,16 @@ static void nvme_map_cmb(struct nvme_dev *dev) return; /* + * Tell the controller about the host side address mapping the CMB, + * and enable CMB decoding for the NVMe 1.4+ scheme: + */ + if (NVME_CAP_CMBS(dev->ctrl.cap)) { + hi_lo_writeq(NVME_CMBMSC_CRE | NVME_CMBMSC_CMSE | + (pci_bus_address(pdev, bar) + offset), + dev->bar + NVME_REG_CMBMSC); + } + + /* * Controllers may support a CMB size larger than their BAR, * for example, due to being behind a bridge. Reduce the CMB to * the reported size of the BAR |