diff options
| author | Ben Widawsky <ben.widawsky@intel.com> | 2021-05-27 17:49:22 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2021-06-05 17:39:12 -0700 |
| commit | 08422378c4adacf528d573bb1631d4818f8f9a01 (patch) | |
| tree | b3c79e80f4868ac1b9e96d91f6627bd3cdd239cd /drivers/cxl/pci.c | |
| parent | 9a016527dcb71e2ecadfeacf52122a79b428790c (diff) | |
cxl/pci: Add HDM decoder capabilities
An HDM decoder is defined in the CXL 2.0 specification as a mechanism
that allow devices and upstream ports to claim memory address ranges and
participate in interleave sets. HDM decoder registers are within the
component register block defined in CXL 2.0 8.2.3 CXL 2.0 Component
Registers as part of the CXL.cache and CXL.mem subregion.
The Component Register Block is found via the Register Locator DVSEC
in a similar fashion to how the CXL Device Register Block is found. The
primary difference is the capability id size of the Component Register
Block is a single DWORD instead of 4 DWORDS.
It's now possible to configure a CXL type 3 device's HDM decoder. Such
programming is expected for CXL devices with persistent memory, and hot
plugged CXL devices that participate in CXL.mem with volatile memory.
Add probe and mapping functions for the component register blocks.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Co-developed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Co-developed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Link: https://lore.kernel.org/r/20210528004922.3980613-6-ira.weiny@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/pci.c')
| -rw-r--r-- | drivers/cxl/pci.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index e1a2dbc2886b..5a1705b52278 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -982,9 +982,20 @@ static int cxl_probe_regs(struct cxl_mem *cxlm, void __iomem *base, { struct pci_dev *pdev = cxlm->pdev; struct device *dev = &pdev->dev; + struct cxl_component_reg_map *comp_map; struct cxl_device_reg_map *dev_map; switch (map->reg_type) { + case CXL_REGLOC_RBI_COMPONENT: + comp_map = &map->component_map; + cxl_probe_component_regs(dev, base, comp_map); + if (!comp_map->hdm_decoder.valid) { + dev_err(dev, "HDM decoder registers not found\n"); + return -ENXIO; + } + + dev_dbg(dev, "Set up component registers\n"); + break; case CXL_REGLOC_RBI_MEMDEV: dev_map = &map->device_map; cxl_probe_device_regs(dev, base, dev_map); @@ -1012,6 +1023,10 @@ static int cxl_map_regs(struct cxl_mem *cxlm, struct cxl_register_map *map) struct device *dev = &pdev->dev; switch (map->reg_type) { + case CXL_REGLOC_RBI_COMPONENT: + cxl_map_component_regs(pdev, &cxlm->regs.component, map); + dev_dbg(dev, "Mapping component registers...\n"); + break; case CXL_REGLOC_RBI_MEMDEV: cxl_map_device_regs(pdev, &cxlm->regs.device_regs, map); dev_dbg(dev, "Probing device registers...\n"); |