Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Copyright(c) 2016-2018 Intel Corporation. All rights reserved. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3) #include <linux/memremap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include <linux/pfn_t.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/cdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/dax.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include "dax-private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include "bus.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) static int check_vma(struct dev_dax *dev_dax, struct vm_area_struct *vma,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 		const char *func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 	struct device *dev = &dev_dax->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 	unsigned long mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 	if (!dax_alive(dev_dax->dax_dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 		return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	/* prevent private mappings from being established */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 		dev_info_ratelimited(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 				"%s: %s: fail, attempted private mapping\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 				current->comm, func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	mask = dev_dax->align - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	if (vma->vm_start & mask || vma->vm_end & mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 		dev_info_ratelimited(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 				"%s: %s: fail, unaligned vma (%#lx - %#lx, %#lx)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 				current->comm, func, vma->vm_start, vma->vm_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 				mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	if (!vma_is_dax(vma)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		dev_info_ratelimited(dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 				"%s: %s: fail, vma is not DAX capable\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 				current->comm, func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) /* see "strong" declaration in tools/testing/nvdimm/dax-dev.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) __weak phys_addr_t dax_pgoff_to_phys(struct dev_dax *dev_dax, pgoff_t pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	for (i = 0; i < dev_dax->nr_range; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		struct dev_dax_range *dax_range = &dev_dax->ranges[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		struct range *range = &dax_range->range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		unsigned long long pgoff_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		phys_addr_t phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		pgoff_end = dax_range->pgoff + PHYS_PFN(range_len(range)) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		if (pgoff < dax_range->pgoff || pgoff > pgoff_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 			continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		phys = PFN_PHYS(pgoff - dax_range->pgoff) + range->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		if (phys + size - 1 <= range->end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			return phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static vm_fault_t __dev_dax_pte_fault(struct dev_dax *dev_dax,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				struct vm_fault *vmf, pfn_t *pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	struct device *dev = &dev_dax->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	phys_addr_t phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	unsigned int fault_size = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (check_vma(dev_dax, vmf->vma, __func__))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (dev_dax->align > PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 			dev_dax->align, fault_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (fault_size != dev_dax->align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	phys = dax_pgoff_to_phys(dev_dax, vmf->pgoff, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	if (phys == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", vmf->pgoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	*pfn = phys_to_pfn_t(phys, PFN_DEV|PFN_MAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	return vmf_insert_mixed(vmf->vma, vmf->address, *pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) static vm_fault_t __dev_dax_pmd_fault(struct dev_dax *dev_dax,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 				struct vm_fault *vmf, pfn_t *pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	unsigned long pmd_addr = vmf->address & PMD_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	struct device *dev = &dev_dax->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	phys_addr_t phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	pgoff_t pgoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	unsigned int fault_size = PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	if (check_vma(dev_dax, vmf->vma, __func__))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (dev_dax->align > PMD_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 			dev_dax->align, fault_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (fault_size < dev_dax->align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	else if (fault_size > dev_dax->align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 		return VM_FAULT_FALLBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	/* if we are outside of the VMA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (pmd_addr < vmf->vma->vm_start ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			(pmd_addr + PMD_SIZE) > vmf->vma->vm_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	pgoff = linear_page_index(vmf->vma, pmd_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	phys = dax_pgoff_to_phys(dev_dax, pgoff, PMD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (phys == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	*pfn = phys_to_pfn_t(phys, PFN_DEV|PFN_MAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	return vmf_insert_pfn_pmd(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 				struct vm_fault *vmf, pfn_t *pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	unsigned long pud_addr = vmf->address & PUD_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	struct device *dev = &dev_dax->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	phys_addr_t phys;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	pgoff_t pgoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	unsigned int fault_size = PUD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	if (check_vma(dev_dax, vmf->vma, __func__))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (dev_dax->align > PUD_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		dev_dbg(dev, "alignment (%#x) > fault size (%#x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			dev_dax->align, fault_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (fault_size < dev_dax->align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	else if (fault_size > dev_dax->align)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		return VM_FAULT_FALLBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	/* if we are outside of the VMA */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	if (pud_addr < vmf->vma->vm_start ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 			(pud_addr + PUD_SIZE) > vmf->vma->vm_end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	pgoff = linear_page_index(vmf->vma, pud_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	phys = dax_pgoff_to_phys(dev_dax, pgoff, PUD_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (phys == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		dev_dbg(dev, "pgoff_to_phys(%#lx) failed\n", pgoff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		return VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	*pfn = phys_to_pfn_t(phys, PFN_DEV|PFN_MAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	return vmf_insert_pfn_pud(vmf, *pfn, vmf->flags & FAULT_FLAG_WRITE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) static vm_fault_t __dev_dax_pud_fault(struct dev_dax *dev_dax,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 				struct vm_fault *vmf, pfn_t *pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	return VM_FAULT_FALLBACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #endif /* !CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) static vm_fault_t dev_dax_huge_fault(struct vm_fault *vmf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		enum page_entry_size pe_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	struct file *filp = vmf->vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	unsigned long fault_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	vm_fault_t rc = VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	int id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	pfn_t pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	struct dev_dax *dev_dax = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	dev_dbg(&dev_dax->dev, "%s: %s (%#lx - %#lx) size = %d\n", current->comm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 			(vmf->flags & FAULT_FLAG_WRITE) ? "write" : "read",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 			vmf->vma->vm_start, vmf->vma->vm_end, pe_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	id = dax_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	switch (pe_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	case PE_SIZE_PTE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		fault_size = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		rc = __dev_dax_pte_fault(dev_dax, vmf, &pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	case PE_SIZE_PMD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		fault_size = PMD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		rc = __dev_dax_pmd_fault(dev_dax, vmf, &pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	case PE_SIZE_PUD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		fault_size = PUD_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		rc = __dev_dax_pud_fault(dev_dax, vmf, &pfn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		rc = VM_FAULT_SIGBUS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	if (rc == VM_FAULT_NOPAGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 		unsigned long i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		pgoff_t pgoff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		 * In the device-dax case the only possibility for a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 		 * VM_FAULT_NOPAGE result is when device-dax capacity is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		 * mapped. No need to consider the zero page, or racing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		 * conflicting mappings.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 		pgoff = linear_page_index(vmf->vma, vmf->address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 				& ~(fault_size - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		for (i = 0; i < fault_size / PAGE_SIZE; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			struct page *page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 			page = pfn_to_page(pfn_t_to_pfn(pfn) + i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			if (page->mapping)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 				continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			page->mapping = filp->f_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 			page->index = pgoff + i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	dax_read_unlock(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static vm_fault_t dev_dax_fault(struct vm_fault *vmf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	return dev_dax_huge_fault(vmf, PE_SIZE_PTE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static int dev_dax_split(struct vm_area_struct *vma, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	struct file *filp = vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	struct dev_dax *dev_dax = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (!IS_ALIGNED(addr, dev_dax->align))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static unsigned long dev_dax_pagesize(struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	struct file *filp = vma->vm_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	struct dev_dax *dev_dax = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	return dev_dax->align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static const struct vm_operations_struct dax_vm_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	.fault = dev_dax_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	.huge_fault = dev_dax_huge_fault,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	.split = dev_dax_split,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	.pagesize = dev_dax_pagesize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) static int dax_mmap(struct file *filp, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	struct dev_dax *dev_dax = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	int rc, id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	dev_dbg(&dev_dax->dev, "trace\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	 * We lock to check dax_dev liveness and will re-check at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	 * fault time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	id = dax_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	rc = check_vma(dev_dax, vma, __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	dax_read_unlock(id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	vma->vm_ops = &dax_vm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	vma->vm_flags |= VM_HUGEPAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /* return an unmapped area aligned to the dax region specified alignment */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static unsigned long dax_get_unmapped_area(struct file *filp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		unsigned long addr, unsigned long len, unsigned long pgoff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	unsigned long off, off_end, off_align, len_align, addr_align, align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	struct dev_dax *dev_dax = filp ? filp->private_data : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	if (!dev_dax || addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	align = dev_dax->align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	off = pgoff << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	off_end = off + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	off_align = round_up(off, align);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if ((off_end <= off_align) || ((off_end - off_align) < align))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	len_align = len + align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	if ((off + len_align) < off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 	addr_align = current->mm->get_unmapped_area(filp, addr, len_align,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 			pgoff, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	if (!IS_ERR_VALUE(addr_align)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		addr_align += (off - addr_align) & (align - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 		return addr_align;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)  out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) static const struct address_space_operations dev_dax_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	.set_page_dirty		= noop_set_page_dirty,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	.invalidatepage		= noop_invalidatepage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static int dax_open(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	struct dax_device *dax_dev = inode_dax(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	struct inode *__dax_inode = dax_inode(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	struct dev_dax *dev_dax = dax_get_private(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	dev_dbg(&dev_dax->dev, "trace\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	inode->i_mapping = __dax_inode->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	inode->i_mapping->host = __dax_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	inode->i_mapping->a_ops = &dev_dax_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	filp->f_mapping = inode->i_mapping;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 	filp->f_sb_err = file_sample_sb_err(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 	filp->private_data = dev_dax;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	inode->i_flags = S_DAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static int dax_release(struct inode *inode, struct file *filp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	struct dev_dax *dev_dax = filp->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	dev_dbg(&dev_dax->dev, "trace\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) static const struct file_operations dax_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	.llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 	.open = dax_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	.release = dax_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	.get_unmapped_area = dax_get_unmapped_area,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 	.mmap = dax_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	.mmap_supported_flags = MAP_SYNC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) static void dev_dax_cdev_del(void *cdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	cdev_del(cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static void dev_dax_kill(void *dev_dax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	kill_dev_dax(dev_dax);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) int dev_dax_probe(struct dev_dax *dev_dax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	struct dax_device *dax_dev = dev_dax->dax_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	struct device *dev = &dev_dax->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	struct dev_pagemap *pgmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	struct cdev *cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	void *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 	int rc, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) 	pgmap = dev_dax->pgmap;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	if (dev_WARN_ONCE(dev, pgmap && dev_dax->nr_range > 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 			"static pgmap / multi-range device conflict\n"))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) 	if (!pgmap) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 		pgmap = devm_kzalloc(dev, sizeof(*pgmap) + sizeof(struct range)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 				* (dev_dax->nr_range - 1), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) 		if (!pgmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 			return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) 		pgmap->nr_range = dev_dax->nr_range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	for (i = 0; i < dev_dax->nr_range; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 		struct range *range = &dev_dax->ranges[i].range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 		if (!devm_request_mem_region(dev, range->start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 					range_len(range), dev_name(dev))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 			dev_warn(dev, "mapping%d: %#llx-%#llx could not reserve range\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 					i, range->start, range->end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 			return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 		/* don't update the range for static pgmap */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 		if (!dev_dax->pgmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 			pgmap->ranges[i] = *range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	pgmap->type = MEMORY_DEVICE_GENERIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) 	addr = devm_memremap_pages(dev, pgmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 	if (IS_ERR(addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) 		return PTR_ERR(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	inode = dax_inode(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	cdev = inode->i_cdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	cdev_init(cdev, &dax_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	if (dev->class) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) 		/* for the CONFIG_DEV_DAX_PMEM_COMPAT case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) 		cdev->owner = dev->parent->driver->owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) 		cdev->owner = dev->driver->owner;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) 	cdev_set_parent(cdev, &dev->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) 	rc = cdev_add(cdev, dev->devt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) 	rc = devm_add_action_or_reset(dev, dev_dax_cdev_del, cdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) 	if (rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) 		return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) 	run_dax(dax_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) 	return devm_add_action_or_reset(dev, dev_dax_kill, dev_dax);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) EXPORT_SYMBOL_GPL(dev_dax_probe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) static int dev_dax_remove(struct dev_dax *dev_dax)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) 	/* all probe actions are unwound by devm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) static struct dax_device_driver device_dax_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) 	.probe = dev_dax_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) 	.remove = dev_dax_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) 	.match_always = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) static int __init dax_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) 	return dax_driver_register(&device_dax_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) static void __exit dax_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) 	dax_driver_unregister(&device_dax_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) MODULE_AUTHOR("Intel Corporation");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) module_init(dax_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) module_exit(dax_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) MODULE_ALIAS_DAX_DEVICE(0);