From 1d5a4159074bde1b2d5e4a6f5ed34de70a83a39f Mon Sep 17 00:00:00 2001 From: Ben Widawsky Date: Wed, 7 Apr 2021 15:26:21 -0700 Subject: [PATCH] cxl/mem: Move register locator logic into reg setup Start moving code around to ultimately get rid of @cxlm.base. The @cxlm.base member serves no purpose other than intermediate storage of the offset found in cxl_mem_map_regblock() later used by cxl_mem_setup_regs(). Aside from wanting to get rid of this useless member, it will help later when adding new register block identifiers. While @cxlm.base still exists, it will become trivial to remove it in a future patch. No functional change is meant to be introduced in this patch. Signed-off-by: Ben Widawsky Reviewed-by: Jonathan Cameron Link: https://lore.kernel.org/r/20210407222625.320177-4-ben.widawsky@intel.com Signed-off-by: Dan Williams --- drivers/cxl/pci.c | 135 +++++++++++++++++++++++++++--------------------------- 1 file changed, 68 insertions(+), 67 deletions(-) diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index be6936c..df6ccdc 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -870,34 +870,6 @@ static int cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, u16 opcode, return 0; } -/** - * cxl_mem_setup_regs() - Setup necessary MMIO. - * @cxlm: The CXL memory device to communicate with. - * - * Return: 0 if all necessary registers mapped. - * - * A memory device is required by spec to implement a certain set of MMIO - * regions. The purpose of this function is to enumerate and map those - * registers. - */ -static int cxl_mem_setup_regs(struct cxl_mem *cxlm) -{ - struct device *dev = &cxlm->pdev->dev; - struct cxl_regs *regs = &cxlm->regs; - - cxl_setup_device_regs(dev, cxlm->base, ®s->device_regs); - - if (!regs->status || !regs->mbox || !regs->memdev) { - dev_err(dev, "registers not found: %s%s%s\n", - !regs->status ? "status " : "", - !regs->mbox ? "mbox " : "", - !regs->memdev ? "memdev" : ""); - return -ENXIO; - } - - return 0; -} - static int cxl_mem_setup_mailbox(struct cxl_mem *cxlm) { const int cap = readl(cxlm->regs.mbox + CXLDEV_MBOX_CAPS_OFFSET); @@ -1005,6 +977,73 @@ static int cxl_mem_dvsec(struct pci_dev *pdev, int dvsec) return 0; } +/** + * cxl_mem_setup_regs() - Setup necessary MMIO. + * @cxlm: The CXL memory device to communicate with. + * + * Return: 0 if all necessary registers mapped. + * + * A memory device is required by spec to implement a certain set of MMIO + * regions. The purpose of this function is to enumerate and map those + * registers. + */ +static int cxl_mem_setup_regs(struct cxl_mem *cxlm) +{ + struct cxl_regs *regs = &cxlm->regs; + struct pci_dev *pdev = cxlm->pdev; + struct device *dev = &pdev->dev; + u32 regloc_size, regblocks; + int rc, regloc, i; + + regloc = cxl_mem_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_OFFSET); + if (!regloc) { + dev_err(dev, "register location dvsec not found\n"); + return -ENXIO; + } + + /* Get the size of the Register Locator DVSEC */ + pci_read_config_dword(pdev, regloc + PCI_DVSEC_HEADER1, ®loc_size); + regloc_size = FIELD_GET(PCI_DVSEC_HEADER1_LENGTH_MASK, regloc_size); + + regloc += PCI_DVSEC_ID_CXL_REGLOC_BLOCK1_OFFSET; + regblocks = (regloc_size - PCI_DVSEC_ID_CXL_REGLOC_BLOCK1_OFFSET) / 8; + + for (i = 0; i < regblocks; i++, regloc += 8) { + u32 reg_lo, reg_hi; + u8 reg_type; + + /* "register low and high" contain other bits */ + pci_read_config_dword(pdev, regloc, ®_lo); + pci_read_config_dword(pdev, regloc + 4, ®_hi); + + reg_type = FIELD_GET(CXL_REGLOC_RBI_MASK, reg_lo); + + if (reg_type == CXL_REGLOC_RBI_MEMDEV) { + rc = cxl_mem_map_regblock(cxlm, reg_lo, reg_hi); + if (rc) + return rc; + break; + } + } + + if (i == regblocks) { + dev_err(dev, "Missing register locator for device registers\n"); + return -ENXIO; + } + + cxl_setup_device_regs(dev, cxlm->base, ®s->device_regs); + + if (!regs->status || !regs->mbox || !regs->memdev) { + dev_err(dev, "registers not found: %s%s%s\n", + !regs->status ? "status " : "", + !regs->mbox ? "mbox " : "", + !regs->memdev ? "memdev" : ""); + return -ENXIO; + } + + return 0; +} + static struct cxl_memdev *to_cxl_memdev(struct device *dev) { return container_of(dev, struct cxl_memdev, dev); @@ -1424,10 +1463,8 @@ static int cxl_mem_identify(struct cxl_mem *cxlm) static int cxl_mem_probe(struct pci_dev *pdev, const struct pci_device_id *id) { - struct device *dev = &pdev->dev; - u32 regloc_size, regblocks; struct cxl_mem *cxlm; - int rc, regloc, i; + int rc; rc = pcim_enable_device(pdev); if (rc) @@ -1437,42 +1474,6 @@ static int cxl_mem_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (IS_ERR(cxlm)) return PTR_ERR(cxlm); - regloc = cxl_mem_dvsec(pdev, PCI_DVSEC_ID_CXL_REGLOC_OFFSET); - if (!regloc) { - dev_err(dev, "register location dvsec not found\n"); - return -ENXIO; - } - - /* Get the size of the Register Locator DVSEC */ - pci_read_config_dword(pdev, regloc + PCI_DVSEC_HEADER1, ®loc_size); - regloc_size = FIELD_GET(PCI_DVSEC_HEADER1_LENGTH_MASK, regloc_size); - - regloc += PCI_DVSEC_ID_CXL_REGLOC_BLOCK1_OFFSET; - regblocks = (regloc_size - PCI_DVSEC_ID_CXL_REGLOC_BLOCK1_OFFSET) / 8; - - for (i = 0; i < regblocks; i++, regloc += 8) { - u32 reg_lo, reg_hi; - u8 reg_type; - - /* "register low and high" contain other bits */ - pci_read_config_dword(pdev, regloc, ®_lo); - pci_read_config_dword(pdev, regloc + 4, ®_hi); - - reg_type = FIELD_GET(CXL_REGLOC_RBI_MASK, reg_lo); - - if (reg_type == CXL_REGLOC_RBI_MEMDEV) { - rc = cxl_mem_map_regblock(cxlm, reg_lo, reg_hi); - if (rc) - return rc; - break; - } - } - - if (i == regblocks) { - dev_err(dev, "Missing register locator for device registers\n"); - return -ENXIO; - } - rc = cxl_mem_setup_regs(cxlm); if (rc) return rc; -- 2.7.4