iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Merge tag 'cxl-for-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl

Browse Source 
Pull cxl updates from Dan Williams:
 "Compute Express Link (CXL) updates for 6.0:

   - Introduce a 'struct cxl_region' object with support for
     provisioning and assembling persistent memory regions.

   - Introduce alloc_free_mem_region() to accompany the existing
     request_free_mem_region() as a method to allocate physical memory
     capacity out of an existing resource.

   - Export insert_resource_expand_to_fit() for the CXL subsystem to
     late-publish CXL platform windows in iomem_resource.

   - Add a polled mode PCI DOE (Data Object Exchange) driver service and
     use it in cxl_pci to retrieve the CDAT (Coherent Device Attribute
     Table)"

* tag 'cxl-for-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl: (74 commits)
  cxl/hdm: Fix skip allocations vs multiple pmem allocations
  cxl/region: Disallow region granularity != window granularity
  cxl/region: Fix x1 interleave to greater than x1 interleave routing
  cxl/region: Move HPA setup to cxl_region_attach()
  cxl/region: Fix decoder interleave programming
  Documentation: cxl: remove dangling kernel-doc reference
  cxl/region: describe targets and nr_targets members of cxl_region_params
  cxl/regions: add padding for cxl_rr_ep_add nested lists
  cxl/region: Fix IS_ERR() vs NULL check
  cxl/region: Fix region reference target accounting
  cxl/region: Fix region commit uninitialized variable warning
  cxl/region: Fix port setup uninitialized variable warnings
  cxl/region: Stop initializing interleave granularity
  cxl/hdm: Fix DPA reservation vs cxl_endpoint_decoder lifetime
  cxl/acpi: Minimize granularity for x1 interleaves
  cxl/region: Delete 'region' attribute from root decoders
  cxl/acpi: Autoload driver for 'cxl_acpi' test devices
  cxl/region: decrement ->nr_targets on error in cxl_region_attach()
  cxl/region: prevent underflow in ways_to_cxl()
  cxl/region: uninitialized variable in alloc_hpa()
  ...
This commit is contained in:
Linus Torvalds
2022-08-10 11:07:26 -07:00
parent 5e2e7383b5 1cd8a2537e
commit c235698355
39 changed files with 5508 additions and 586 deletions
Download Patch File Download Diff File Expand all files Collapse all files

185
kernel/resource.c
View File

@ -489,8 +489,9 @@ int __weak page_is_ram(unsigned long pfn)
}
EXPORT_SYMBOL_GPL(page_is_ram);
static int __region_intersects(resource_size_t start, size_t size,
unsigned long flags, unsigned long desc)
static int __region_intersects(struct resource *parent, resource_size_t start,
size_t size, unsigned long flags,
unsigned long desc)
{
struct resource res;
int type = 0; int other = 0;
@ -499,7 +500,7 @@ static int __region_intersects(resource_size_t start, size_t size,
res.start = start;
res.end = start + size - 1;
for (p = iomem_resource.child; p ; p = p->sibling) {
for (p = parent->child; p ; p = p->sibling) {
bool is_type = (((p->flags & flags) == flags) &&
((desc == IORES_DESC_NONE) ||
(desc == p->desc)));
@ -543,7 +544,7 @@ int region_intersects(resource_size_t start, size_t size, unsigned long flags,
int ret;
read_lock(&resource_lock);
ret = __region_intersects(start, size, flags, desc);
ret = __region_intersects(&iomem_resource, start, size, flags, desc);
read_unlock(&resource_lock);
return ret;
@ -891,6 +892,13 @@ void insert_resource_expand_to_fit(struct resource *root, struct resource *new)
}
write_unlock(&resource_lock);
}
/*
* Not for general consumption, only early boot memory map parsing, PCI
* resource discovery, and late discovery of CXL resources are expected
* to use this interface. The former are built-in and only the latter,
* CXL, is a module.
*/
EXPORT_SYMBOL_NS_GPL(insert_resource_expand_to_fit, CXL);
/**
* remove_resource - Remove a resource in the resource tree
@ -1773,62 +1781,139 @@ void resource_list_free(struct list_head *head)
}
EXPORT_SYMBOL(resource_list_free);
#ifdef CONFIG_DEVICE_PRIVATE
static struct resource *__request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size, const char *name)
#ifdef CONFIG_GET_FREE_REGION
#define GFR_DESCENDING (1UL << 0)
#define GFR_REQUEST_REGION (1UL << 1)
#define GFR_DEFAULT_ALIGN (1UL << PA_SECTION_SHIFT)
static resource_size_t gfr_start(struct resource *base, resource_size_t size,
resource_size_t align, unsigned long flags)
{
resource_size_t end, addr;
if (flags & GFR_DESCENDING) {
resource_size_t end;
end = min_t(resource_size_t, base->end,
(1ULL << MAX_PHYSMEM_BITS) - 1);
return end - size + 1;
}
return ALIGN(base->start, align);
}
static bool gfr_continue(struct resource *base, resource_size_t addr,
resource_size_t size, unsigned long flags)
{
if (flags & GFR_DESCENDING)
return addr > size && addr >= base->start;
/*
* In the ascend case be careful that the last increment by
* @size did not wrap 0.
*/
return addr > addr - size &&
addr <= min_t(resource_size_t, base->end,
(1ULL << MAX_PHYSMEM_BITS) - 1);
}
static resource_size_t gfr_next(resource_size_t addr, resource_size_t size,
unsigned long flags)
{
if (flags & GFR_DESCENDING)
return addr - size;
return addr + size;
}
static void remove_free_mem_region(void *_res)
{
struct resource *res = _res;
if (res->parent)
remove_resource(res);
free_resource(res);
}
static struct resource *
get_free_mem_region(struct device *dev, struct resource *base,
resource_size_t size, const unsigned long align,
const char *name, const unsigned long desc,
const unsigned long flags)
{
resource_size_t addr;
struct resource *res;
struct region_devres *dr = NULL;
size = ALIGN(size, 1UL << PA_SECTION_SHIFT);
end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1);
addr = end - size + 1UL;
size = ALIGN(size, align);
res = alloc_resource(GFP_KERNEL);
if (!res)
return ERR_PTR(-ENOMEM);
if (dev) {
if (dev && (flags & GFR_REQUEST_REGION)) {
dr = devres_alloc(devm_region_release,
sizeof(struct region_devres), GFP_KERNEL);
if (!dr) {
free_resource(res);
return ERR_PTR(-ENOMEM);
}
} else if (dev) {
if (devm_add_action_or_reset(dev, remove_free_mem_region, res))
return ERR_PTR(-ENOMEM);
}
write_lock(&resource_lock);
for (; addr > size && addr >= base->start; addr -= size) {
if (__region_intersects(addr, size, 0, IORES_DESC_NONE) !=
REGION_DISJOINT)
for (addr = gfr_start(base, size, align, flags);
gfr_continue(base, addr, size, flags);
addr = gfr_next(addr, size, flags)) {
if (__region_intersects(base, addr, size, 0, IORES_DESC_NONE) !=
REGION_DISJOINT)
continue;
if (__request_region_locked(res, &iomem_resource, addr, size,
name, 0))
break;
if (flags & GFR_REQUEST_REGION) {
if (__request_region_locked(res, &iomem_resource, addr,
size, name, 0))
break;
if (dev) {
dr->parent = &iomem_resource;
dr->start = addr;
dr->n = size;
devres_add(dev, dr);
if (dev) {
dr->parent = &iomem_resource;
dr->start = addr;
dr->n = size;
devres_add(dev, dr);
}
res->desc = desc;
write_unlock(&resource_lock);
/*
* A driver is claiming this region so revoke any
* mappings.
*/
revoke_iomem(res);
} else {
res->start = addr;
res->end = addr + size - 1;
res->name = name;
res->desc = desc;
res->flags = IORESOURCE_MEM;
/*
* Only succeed if the resource hosts an exclusive
* range after the insert
*/
if (__insert_resource(base, res) || res->child)
break;
write_unlock(&resource_lock);
}
res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY;
write_unlock(&resource_lock);
/*
* A driver is claiming this region so revoke any mappings.
*/
revoke_iomem(res);
return res;
}
write_unlock(&resource_lock);
free_resource(res);
if (dr)
if (flags & GFR_REQUEST_REGION) {
free_resource(res);
devres_free(dr);
} else if (dev)
devm_release_action(dev, remove_free_mem_region, res);
return ERR_PTR(-ERANGE);
}
@ -1847,18 +1932,48 @@ static struct resource *__request_free_mem_region(struct device *dev,
struct resource *devm_request_free_mem_region(struct device *dev,
struct resource *base, unsigned long size)
{
return __request_free_mem_region(dev, base, size, dev_name(dev));
unsigned long flags = GFR_DESCENDING | GFR_REQUEST_REGION;
return get_free_mem_region(dev, base, size, GFR_DEFAULT_ALIGN,
dev_name(dev),
IORES_DESC_DEVICE_PRIVATE_MEMORY, flags);
}
EXPORT_SYMBOL_GPL(devm_request_free_mem_region);
struct resource *request_free_mem_region(struct resource *base,
unsigned long size, const char *name)
{
return __request_free_mem_region(NULL, base, size, name);
unsigned long flags = GFR_DESCENDING | GFR_REQUEST_REGION;
return get_free_mem_region(NULL, base, size, GFR_DEFAULT_ALIGN, name,
IORES_DESC_DEVICE_PRIVATE_MEMORY, flags);
}
EXPORT_SYMBOL_GPL(request_free_mem_region);
#endif /* CONFIG_DEVICE_PRIVATE */
/**
* alloc_free_mem_region - find a free region relative to @base
* @base: resource that will parent the new resource
* @size: size in bytes of memory to allocate from @base
* @align: alignment requirements for the allocation
* @name: resource name
*
* Buses like CXL, that can dynamically instantiate new memory regions,
* need a method to allocate physical address space for those regions.
* Allocate and insert a new resource to cover a free, unclaimed by a
* descendant of @base, range in the span of @base.
*/
struct resource *alloc_free_mem_region(struct resource *base,
unsigned long size, unsigned long align,
const char *name)
{
/* Default of ascending direction and insert resource */
unsigned long flags = 0;
return get_free_mem_region(NULL, base, size, align, name,
IORES_DESC_NONE, flags);
}
EXPORT_SYMBOL_NS_GPL(alloc_free_mem_region, CXL);
#endif /* CONFIG_GET_FREE_REGION */
static int __init strict_iomem(char *str)
{