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| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2024-05-07 13:25:21 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-05-28 11:14:14 -0500 |
| commit | 2700225304e8e4f0f29f2bbb8ad0c112c9666d90 (patch) | |
| tree | b92b8331c7b6eee8e09ca07efea9f51e4c4a4890 /include | |
| parent | 094c0ce5451dd6232938e307d6f259e76571a778 (diff) | |
| download | lwn-2700225304e8e4f0f29f2bbb8ad0c112c9666d90.tar.gz lwn-2700225304e8e4f0f29f2bbb8ad0c112c9666d90.zip | |
resource: Export find_resource_space()
PCI bridge window logic needs to find out in advance to the actual
allocation if there is an empty space big enough to fit the window.
Export find_resource_space() for the purpose. Also move the struct
resource_constraint into generic header to be able to use the new
interface.
Link: https://lore.kernel.org/r/20240507102523.57320-7-ilpo.jarvinen@linux.intel.com
Tested-by: Lidong Wang <lidong.wang@intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ioport.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 28266426e5bf..6e9fb667a1c5 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -205,6 +205,25 @@ typedef resource_size_t (*resource_alignf)(void *data, resource_size_t size, resource_size_t align); +/** + * struct resource_constraint - constraints to be met while searching empty + * resource space + * @min: The minimum address for the memory range + * @max: The maximum address for the memory range + * @align: Alignment for the start address of the empty space + * @alignf: Additional alignment constraints callback + * @alignf_data: Data provided for @alignf callback + * + * Contains the range and alignment constraints that have to be met during + * find_resource_space(). @alignf can be NULL indicating no alignment beyond + * @align is necessary. + */ +struct resource_constraint { + resource_size_t min, max, align; + resource_alignf alignf; + void *alignf_data; +}; + /* PC/ISA/whatever - the normal PC address spaces: IO and memory */ extern struct resource ioport_resource; extern struct resource iomem_resource; @@ -278,6 +297,9 @@ static inline bool resource_union(const struct resource *r1, const struct resour return true; } +int find_resource_space(struct resource *root, struct resource *new, + resource_size_t size, struct resource_constraint *constraint); + /* Convenience shorthand with allocation */ #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0) #define request_muxed_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), IORESOURCE_MUXED) |