🔥 pci_create_slot(9) — linux-manual-4.11 — Debian experimental — Debian Manpages

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To get the Linux IRQ number used for a vector that can be passed to.. const char * name: user visible string presented in /sys/bus/pci/slots/; struct ...


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This is the complete Linux Kernel Series on one page. Enjoy!.... Enabling this next feature will create files (/sys/bus/pci/slots/) for each PCI slot ...


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Chapter 2. Configuring Your System
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Hardware linux /sys/bus/pci/slots Intel Xeon E5-1650 v3 ASRock X99 WS PCIe Slot 1: NVIDIA Tesla Read article Pcie Slot 2: StarTech USB3.
On Windows, it is sitting on PCI bus 4 and the Tesla K40 is on PCI bus 5 I may have the reversed, should have written it down.
When linux /sys/bus/pci/slots the host into Linux, however, the StarTech USB controller is nowhere to be found.
Furthermore, according to dmidecode, slots 1 linux /sys/bus/pci/slots 2 are sitting on the same PCI bus: 0000:04:00.
This occurs with kernels 4.
There linux /sys/bus/pci/slots probably some hardware flakiness because sometimes linux /sys/bus/pci/slots boot the system hangs on the bios loading screen while I'm guessing inspecting pcie devices led display on the motherboard shows 99, which is a pcie error, but 99 is also displayed during successful boots, it just doesn't get stuck linux /sys/bus/pci/slots />It works consistently in Windows.
It doesn't work consistently in Linux.
It worked in Linux in a different PCIe slot.
Yes, the second "Slot5" in dmidecode appears to be a bios bug.
That should be "Slot6".
Anyone ever seen anything like this?
Handle 0x0008, DMI type 9, 17 bytes System Slot Information Designation: Slot1 Type: x16 PCI Express Current Usage: In Use Length: Long ID: 17 Characteristics: 3.

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pci_create_slot: create or increment refcount for physical PCI slot - Linux Man Pages (9)
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PCI Support Library — The Linux Kernel documentation
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Revert "PCI: create function symlinks in /sys/bus/pci/slots/N/" This reverts commit. (possibly older) -Contact: [email protected] -Description: - When the ...


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pci_create_slot(9) — linux-manual-4.11 — Debian experimental — Debian Manpages
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pci_create_slot: create or increment refcount for physical PCI slot - Linux Man Pages (9)
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www.EMC.com. 2. PowerPath for Linux 6.3 Installation and Administration Guide.... echo 1 > /sys/bus/pci/slots/[pci bus #_pci slot #]/power. 3.


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UTC From: Jordan Hargrave There currently isn't an point. ios blackjack game excellent way to determine which PCI devices belong to system slots.
This patch adds support to read SMBIOS Type 9 System Slots.
This patch adds support to read SMBIOS Type 9 System Slots.
I'm wondering, can't you use dmidecode or libsmbios to retrieve the same information?
July 13, 2015, guide mwo blackjack p.
Eventually planning on using this for pulling slot number for identifying network cards and disk numbering for systemd -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo vger.
Neither dmidecode nor libsmbios report the slot number for devices behind bridges in a slot.
I'm wanting to use this sysfs variable to get slot numbers for systemd, so using libsmbios and dmidecode aren't very useful.
We already report the index for embedded devices in pci-label.
The SMBIOS entry for slot 3 is 40:00.
This code will provide a 'slot' sysfs variable that reports '3' for all devices under and including the bridge.
This patch adds support to read SMBIOS Type 9 System Slots.
I expected something like: - Look for DMI info that's an exact match for my D:B:D.
This patch adds support to read SMBIOS Type 9 System Slots.
This way we only need to search a single pci device for the slot.
Otherwise match any function number.
True, but it's straightforward linux /sys/bus/pci/slots walk up the PCI tree in sysfs, e.
If you want this in systemd, I see why you wouldn't want a command like dmidecode.
Help me understand the problem with libsmbios.
Is it not useful because a systemd doesn't want to link with it, or b libsmbios doesn't have the right information, or c something else?
The SMBIOS entry for slot 3 is 40:00.
What if the card in slot 3 is an adapter leading to an external PCI chassis?
Wouldn't we then have a 'slot' file for every card in that chassis, linux /sys/bus/pci/slots containing '3'?
This sounds confusing, although it is true that they all would be connected via the system board slot 3.
If we do put something like this in the kernel, how would it relate to that hierarchy?
Could this SMBIOS stuff be integrated into that somehow?
We have linux /sys/bus/pci/slots bit of a hodge-podge of slot names already, and I'd like to simplify things if we can.
Bjorn -- To linux /sys/bus/pci/slots from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo vger.
You have to check all functions on all devices as well on the walk linux /sys/bus/pci/slots the root.
Would it look something like this?
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
And that's not easily to determine a parent device from the slots interface.
I'd really like something here here.
Help me linux /sys/bus/pci/slots the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
We aren't really converging here yet.
We need to figure out exactly what has to be done in the kernel because it can't be done in user-space.
The goal "determine which PCI devices belong to system slots" is definitely generic and useful.
We have quite a bit of continue reading stuff already in the kernel, and some is already exposed via sysfs, so if we're still missing what you need, it seems like the current code is off the rails somewhere and should be fixed.
Can we explore what you need in a little more detail, with some concrete examples?
A slot number seems like a user interface thing, so I'm surprised that a driver would be concerned with it.
And of course, SMBIOS is an arch-specific thing, so the driver would have to be able to get along without the slot number anyway.
Where would these IDs come from, and what sort of reporting mechanism are you looking for?
How are these structured?
Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo vger.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
It's a pain to do in user space as you have to read DMI information, then traverse PCI hierarchy until you find a match.
Every utility or code that wants to match a PCI device to a SMBIOS slot must reinvent the wheel.
It https://ipodxs.com/blackjack/reglas-21-blackjack.html reads in all pci devices and attempts to do a mapping.
Why do this when the kernel already has this info easily available.
It's :: so you still have the problem of what about bus 43-45 that are go here of bus 42.
So wrote a script:!
However you must query every PCI Bus number in the system to get the correct enclosure mapping.
Currently yes there is a 1:1 mapping.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
It then reads in all pci devices and attempts to do a mapping.
Yeah just verified this won't work on this config.
Currently yes there is check this out 1:1 mapping.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
It then reads in all pci devices and attempts to linux /sys/bus/pci/slots a mapping.
Currently yes there is a 1:1 mapping.

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This is good for implementing stacks.
This is useful for implementing queues.
Note on entry does not return true after this, the entry is in an undefined state.
You should pass on entry an element you know is on head.
Description Each of the lists is a queue.
Description Note, that list is expected to be not empty.
Description Note, that list is expected to be not empty.
Description Note that if the list is empty, it returns NULL.
Description Prepares a pos entry for use as a start point in.
Description Continue to iterate over list of given type, continuing after the current position.
Description Start to iterate over list of given type backwards, continuing after the current position.
Description Iterate over list of given type, continuing from current position.
Description Iterate over list of given type, continuing after current point, safe against removal of list entry.
Description Iterate over list of given type from current point, safe against removal of list entry.
Description Iterate backwards over list of given type, safe against removal of list entry.
Basic C Library Functions When writing drivers, you cannot in general use routines which are from the C Library.
Some of the functions have been found generally useful and they are listed below.
The behaviour of these functions may vary slightly from those defined by ANSI, and these deviations are noted in the text.
Please use kstrtoull instead.
Please use kstrtoul instead.
Please use kstrtol instead.
Please use kstrtoll instead.
If the return is greater than or equal to size, the resulting string is truncated.
See the documentation for format string extensions over C99.
If the return is greater than or equal to size, the resulting string is truncated.
See the documentation for format string extensions over C99.
Use or in order to avoid buffer overflows.
See the documentation for format string extensions over C99.
Use or in order to avoid buffer overflows.
See the documentation for format string extensions over C99.
The return value is the number of words 32bits which would be generated for the given input.
The format follows C99 vsnprintf, but has some extensions: see vsnprintf comment for details.
If the return is greater than or equal to size, the resulting string is truncated.
The string must be null-terminated, and may also include a single newline before its terminating null.
The first character may also be a plus sign or a minus sign.
The maximum supported base is 16.
If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.
Otherwise it will be parsed as a decimal.
Description Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
Return code must be checked.
The string must be null-terminated, and may also include a single newline before its terminating null.
The first character may also be a plus sign, but not a minus sign.
The maximum supported base is 16.
If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.
Otherwise it will be parsed as a decimal.
Description Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
Return code must be checked.
The string must be null-terminated, and may also include a single newline before its terminating null.
The first character may also be a plus sign, but not a minus sign.
The maximum supported base is 16.
If base is given as 0, then the base of the string is automatically detected with 21 3 blackjack conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.
Otherwise it will be parsed as a decimal.
Description Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
Return code must be checked.
The string must be null-terminated, and may also include a single newline before its terminating null.
The first character may also be a plus sign or a minus sign.
The maximum supported base is 16.
If base is given as 0, read article the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.
Otherwise it will be parsed as a decimal.
Description Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
Return code must be checked.
The string must be null-terminated, and may also include a single newline before its terminating null.
The first character may also be a plus sign, but not a minus sign.
The maximum supported base is 16.
If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.
Otherwise it will be parsed as a decimal.
Description Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
Return code must be checked.
The string must be null-terminated, and may also include a single newline before its terminating null.
The first character may also be a plus sign or a minus sign.
The maximum supported base is 16.
If base is given as 0, then the base of the string is automatically detected with the conventional semantics - If it begins with 0x the number will be parsed as a hexadecimal case insensitiveif it otherwise begins with 0, it will be parsed as an octal number.
Otherwise it will be parsed as a decimal.
Description Returns 0 on success, -ERANGE on overflow and -EINVAL on parsing error.
Return code must be checked.
Otherwise it will return -EINVAL.
Value pointed to by res is updated upon finding a match.
In the case where the length of src is less than that of count, the remainder of dest will be padded with NUL.
It does not pad out the result like does.
The behavior is undefined if the string buffers overlap.
In addition, the implementation is robust to the string changing out from underneath it, unlike the current implementation.
If c is not found, then return a pointer to the null byte at the end of s.
Description Returns a pointer to the first non-whitespace character in str.
Description Note that the first trailing whitespace is replaced with a NUL-terminator in the given string s.
Returns a pointer to the first non-whitespace character in s.
It returns empty tokens, too, behaving exactly like the libc function of that name.
In fact, it was stolen from glibc2 and de-fancy-fied.
Same semantics, slimmer shape.
Note usually using is just fine!
Description Unlikecopes with overlapping areas.
Description returns the address of the first character other than c, or NULL if the whole buffer contains just c.
Description Returns pointer to the nul byte at the end of s.
See if you do not require the atomic guarantees.
Note there are no guarantees that this function will not be reordered on non x86 architectures, so if you are writing portable code, make sure not to rely on its reordering guarantees.
Note that nr may be almost arbitrarily large; this function is not restricted to acting on a single-word quantity.
Note that nr may be almost arbitrarily large; this function is not restricted to acting on a single-word quantity.
It also implies a memory barrier.
If two examples of this operation race, one can appear to succeed but actually fail.
You must protect multiple accesses with a lock.
It also implies a memory barrier.
If two examples of this operation race, one can appear to succeed but actually fail.
You must protect multiple accesses with a lock.
Note the operation is performed atomically with respect to the local CPU, but not other CPUs.
Portable code should not rely on this behaviour.
It also implies a memory barrier.
The first least significant bit is at position 1.
The last most significant bit is at position 32.
The last most significant bit is at position 64.
Zeros are fed into the vacated MS positions and the LS bits shifted off the bottom are lost.
Zeros are fed into the vacated LS bit positions and those MS bits shifted off the top are lost.
If string is smaller than this then it must be terminated with a 0.
Description Commas group hex digits into chunks.
Each chunk defines exactly 32 bits of the resultant bitmask.
No chunk may specify a value larger than 32 bits -EOVERFLOWand if a chunk specifies a smaller value then leading 0-bits are prepended.
Leading and trailing whitespace accepted, but not embedded whitespace.
If string is smaller than this then it must be terminated with a 0.
Description Wrapper forproviding it with user buffer.
We cannot have this as an inline function in bitmap.
Returns the number of characters written to buf.
If string is smaller than this then it must be terminated with a 0.
We cannot have this as an inline function in bitmap.
If either of the old and new bitmaps are empty, or if src and dst point to the same location, then this routine copies src to dst.
The positions of unset bits in old are mapped to themselves the identify map.
Apply the above specified mapping to src, placing the result in dst, clearing any bits previously set in dst.
For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set.
This defines the mapping of bit position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other bit positions unchanged.
So if say src comes into this routine with bits 1, 5 and 7 set, then dst should leave with bits 1, 13 and 15 set.
The positions of unset bits in old are mapped to themselves the identify map.
Apply the above specified mapping to bit position oldbit, returning the new bit position.
For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set.
This defines the mapping of bit position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other bit positions unchanged.
So if say oldbit is 5, then this routine returns 13.
In other words, orig is mapped onto surjectively dst, using the map { the n-th bit of relmap is the m-th set bit of relmap }.
Any set bits in orig above bit number W, where W is the weight of number of set bits in relmap are mapped nowhere.
The operator does this by setting the bit m % W in dst, for each bit m set in orig.
Then on return from this routine, dst will have bits 31, 33, 35, 37 and 39 set.
When bit 0 is set in orig, it means turn on the bit in dst corresponding to whatever is the first bit if any that is turned on in relmap.
Since bit 0 was off in the above example, we leave off that bit bit 30 in dst.
When bit 1 is set in orig as in the above exampleit means turn on the bit in dst corresponding to whatever is the second bit that is turned on in relmap.
The second bit in relmap that was turned on in the above example was bit 31, so we turned on bit 31 in dst.
Similarly, we turned on bits 33, 35, 37 and 39 in dst, because they were the 4th, 6th, 8th and 10th set bits set in relmap, and the 4th, 6th, 8th and 10th bits of orig i.
When bit 11 is set in orig, it means turn on the bit in dst corresponding to whatever is the twelfth bit that is turned on in relmap.
In the above example, there were only article source bits turned on in relmap 30.
I list the zero-based positions of each set bit.
The tmp column shows the intermediate result, as computed by using to fold the orig bitmap modulo ten the weight of relmap.
If either of orig or relmap is empty no set bits blackjack cheat sheet, then dst will be returned empty.
All bits in dst not set by the above rule are cleared.
Clear all other bits in dst.
Only consider regions of length a power order of two, aligned to that power of two, which makes the search algorithm much faster.
Return the bit offset in bitmap of the allocated region, or -errno on failure.
In last word of bitmap, the bits beyond nbits if any are kept unchanged.
Return the number of bits effectively copied.
Remaining bits after nbits in buf if any are cleared.
Return the number of bits effectively copied.
If string is smaller than this then it must be terminated with a 0.
Consecutively set bits are shown as two hyphen-separated decimal numbers, the smallest and largest bit numbers set in the range.
Returns 0 on success, -errno on invalid input strings.
If it is not set or if pos is not a valid bit position, map to -1.
If for example, just bits 4 through 7 are set in buf, then pos values 4 through 7 will get mapped to 0 through 3, respectively, and other pos values will get mapped to -1.
When pos value 7 gets mapped to returns ord value 3 in this example, that means that bit 7 is the 3rd starting with 0th set bit in buf.
The bit positions 0 through bits are valid positions in buf.
If for example, just bits 4 through 7 are set in buf, then ord values 0 through 3 will get mapped to 4 through 7, respectively, and all other ord values returns nbits.
When ord value 3 gets mapped to returns pos value 7 in this example, that means that the 3rd set bit starting with 0th is at position 7 in buf.
The bit positions 0 through nbits-1 are valid positions in buf.
The parse halts when the array is full, or when no more numbers can be retrieved from the string.
Return value is the character in the string which caused the parse to end typically a null terminator, if str is completely parseable.
The number stored at ptr is potentially suffixed with K, M, G, T, P, E.
The CRC7 is left-aligned in the byte the lsbit is always 0as that makes the computation easier, and all callers want it in that form.
Other readers lock-free or otherwise and modifications may be running concurrently.
It is still required that the caller manage the synchronization and lifetimes of the items.
So if RCU lock-free lookups are used, typically this would mean that the items have their own locks, or are amenable to lock-free access; and that the items are freed by RCU or only freed after having been deleted from the idr tree and a grace period.
Memory usage is much lower than full blown idr because each id only occupies a bit.
Note that preemption is disabled while preloaded.
This allows using more permissive allocation masks for idrs protected by spinlocks.
If no ID is available in the specified range, returns -ENOSPC.
On memory allocation failure, returns -ENOMEM.
This is to always allow using start + N as end as long as N is inside integer range.
The user is responsible for exclusively synchronizing all operations which may modify idr.
The caller is responsible for ensuring that no one else accesses idp during or after.
The callback function will be called for each pointer currently registered, passing the id, the pointer and the data pointer passed to this function.
We check the return of fn each time.
If it returns anything other than 0, we break out and return that value.
A -ENOENT return indicates that id was not found.
A -EINVAL return indicates that id was not within valid constraints.
The caller must serialize with writers.
It preallocates enough memory to satisfy the worst possible allocation.
If the system is REALLY out of memory this function returns 0, otherwise 1.
It should be called with any required locks.
If memory is required, it will return -EAGAIN, you should unlock and go back to the call.
If the ida is full, it will return -ENOSPC.
On memory allocation failure, returns -ENOMEM.
Use to get rid of an id.
Description kmalloc is the normal method of allocating memory for objects smaller than page size in the kernel.
May use emergency pools.
For example, use this inside interrupt handlers.
Should only be used for caches.
There are other flags available as well, but these are not intended for general use, and so are not documented here.
The memory is set to zero.
The memory is set to zero.
Description Allocate an object from this cache.
The flags are only relevant if the cache has no available objects.
Description Free an object which was previously allocated from this cache.
Description If objp is NULL, no operation is performed.
The caller may use this additional memory, even though a smaller amount of memory was initially specified with the kmalloc call.
The caller must guarantee that objp points to a valid object previously allocated with either or.
The object must not be freed during the duration of the call.
Description Returns number of pages pinned.
This may be fewer than the number requested.
If no pages were pinned, returns -errno.
However if the pages have to be faulted in, it may turn out to be slightly slower so callers need to carefully consider what to use.
Context User context only.
Description Copy data from kernel space to user space.
Context User context only.
This function may sleep if pagefaults are enabled.
Description Copy data from kernel space to user space.
Returns number of bytes that could not be copied.
On success, this will be zero.
Context User context only.
This function may sleep if pagefaults are enabled.
Description Copy data from user space to kernel space.
Returns number of bytes that could not be copied.
On success, this will be zero.
If some data could not be copied, this function will pad the copied data to the requested size using zero bytes.
In this case the uncopied bytes will NOT be padded with zeros.
Description Zero a block of memory in user space.
Returns number of bytes that could not be cleared.
On success, this will be zero.
Description Zero a block of memory in user space.
Returns number of bytes that could not be cleared.
On success, this will be zero.
Context User context only.
This function may sleep if pagefaults are enabled.
Description Copy data from kernel space to user space.
Returns number of bytes that could not be copied.
On success, this will be zero.
Context User context only.
This function may sleep if pagefaults are enabled.
Description Copy data from user space to kernel space.
Returns number of bytes that could not be copied.
On success, this will be zero.
If some data could not be copied, this function will pad the copied data to the requested size go here zero bytes.
Description Hides the details of the LRU cache etc from the filesystems.
The readahead logic may decide to piggyback more pages onto the read request if access patterns suggest it will improve performance.
It will never put the page into the free list, the caller has a reference on the page.
Check error status of the address space and return it.
Check error status of the address space and return it.
On success it acquires the pagecache reference for the new page and drops it for the old page.
Both the old and new pages must be locked.
This function does not add the new page to the LRU, the caller must do that.
The remove + add is atomic.
The only way this function can fail is memory allocation failure.
It must be locked.
This function does not add the page to the LRU.
The caller must do that.
In rare cases of index wrap-around, 0 will be returned.
If there is a page cache page, it is returned with an increased refcount.
Otherwise, NULL is returned.
If there is a page cache page, it is returned locked and with an increased refcount.
Otherwise, NULL is returned.
PCG flags modify how the page is returned.
The page is returned locked with blackjack money app real with an increased refcount.
Otherwise, NULL is returned.
If there is a page cache page, it is returned with an increased refcount.
We update index to index the next page for the traversal.
If a page already exists, and PageUptodate is not set, try to fill the page and wait for it to become unlocked.
If the page does not get brought uptodate, return -EIO.
If the page does not get brought uptodate, return -EIO.
It does all basic checks, removes SUID from the file, updates modification times and calls proper subroutines depending on whether we do direct IO or a standard buffered write.
A caller has to handle it.
The entire address range must be fully contained within the vma.
Returns 0 if successful.
The page does not need to be reserved.
As this is called only for pages that do not currently exist, we do not need to flush old virtual caches or the TLB.
This only makes sense for IO mappings, and it makes no sense for cow mappings.
Note that this is different fromwhich must keep the partial page.
In contrast, we must get rid of partial pages.
A holelen of zero truncates to the end of the file.
Returns zero and the pfn at pfn on success, -ve otherwise.
What this means is that any page you have now, may, in a former life, have been mapped into kernel virtual address by the vmap layer and so there might be some CPUs with TLB entries still referencing that page additional to the regular 1:1 kernel mapping.
After it returns, we can be sure that none of the pages we have control over click to see more have any aliases from the vmap layer.
But if you mix long-life and short-life objects withit could consume lots of address space through fragmentation especially on a 32bit machine.
You could see failures in the end.
Please use this function for short-lived objects.
NOTE This function does NOT do any cache flushing.
If addr is NULL, no operation is performed.
Must not be called in interrupt context.
The memory allocated is set to zero.
The memory allocated is set to zero.
No actual mappings are created.
It returns -1 if no node is found.
If called for a node with no available memory, a warning is printed and the start and end PFNs will be 0.
It calculates the maximum power of two alignment which can distinguish all the nodes.
If the nodes are shifted by 256MiB, 256MiB.
Note that if only the last node is shifted, 1GiB is enough and this function will indicate so.
If the maximum PFN between two adjacent zones match, it is assumed that the zone is empty.
It is also assumed that a zone starts where the previous one ended.
In the DMA zone, a significant percentage may be consumed by kernel image and other unfreeable allocations which can skew the watermarks badly.
This function may optionally be used to account for unfreeable pages in the first zone e.
The effect will be lower watermarks and smaller per-cpu batchsize.
All pageblocks in range must have the same migratetype and it must be either of the two.
The PFN range must belong to a single zone.
Returns zero on success or negative error code.
Description Free all reserved elements in pool and pool itself.
Description this function creates and allocates a guaranteed size, preallocated memory pool.
The pool can be used from the and functions.
This function might sleep.
In the case of growing, it cannot be guaranteed that the pool will be grown to the new size immediately, but new calls will refill it.
This function may sleep.
Note that due to preallocation, this function never fails when called from process contexts.
Given one of these pools, may be used to allocate memory.
The actual size of blocks allocated may be larger than requested because of alignment.
This is useful for devices which have addressing restrictions on individual DMA transfers, such as not crossing boundaries of 4KBytes.
DMA pool created with this function is automatically destroyed on driver detach.
This mechanism is used to avoid livelocking of writeback by a process steadily creating new dirty pages in the file thus it is important for this function to be quick so that it can tag pages faster than a dirtying process can create them.
This is desirable behaviour for memory-cleaning writeback, but it is INCORRECT for data-integrity system calls such as fsync.
To avoid livelocks when other process dirties new pageswe first tag pages which should be written back with TOWRITE tag and only then start writing them.
For data-integrity sync we have to be careful so that we do not miss some pages e.
The rule we follow is that TOWRITE tag can be cleared only by the process clearing the DIRTY tag and submitting the page for IO.
Description This function determines if the given page is related to a backing device that requires page contents to be held stable during writeback.
If so, then it will wait for any pending writeback to complete.
Truncate takes two passes - the first pass is nonblocking.
The second pass will wait.
This is to prevent as much IO as possible in the affected region.
The first pass will remove most pages, so the search cost of the second pass is low.
We pass down the cache-hot hint to the page freeing code.
Even if the mapping is large, it is probably the case that the final pages are the most recently touched, and freeing happens in ascending file offset order.
Filesystems have to use this in the.
It will not invalidate pages which are dirty, locked, under writeback or mapped into pagetables.
Returns -EBUSY if any pages could not be invalidated.
Returns -EBUSY if any pages could not be invalidated.
This function should typically be called before the filesystem releases resources associated with the freed range eg.
This way, pagecache will always stay logically coherent with on-disk format, and the filesystem would not have to deal with situations such as writepage being called for a page that has already had its underlying blocks deallocated.
This way, pagecache will always stay logically coherent with on-disk format, and the filesystem would not have to deal with situations such as writepage being called for a page that has already had its underlying blocks deallocated.
The permissions object is initialised and the first free entry is set up and the id assigned is returned.
On failure the entry is not locked and a negative err-code is returned.
On success, the ipc id is returned.
On success, the ipc id is returned.
Returns the pointer to the object or NULL upon failure.
Call inside the RCU critical section.
The ipc object is not locked on exit.
The ipc object is locked on successful exit.
Call inside the RCU critical section.
The ipc object is not locked on exit.
Call holding the both the rwsem and the rcu read lock.
The cmd value is turned from an encoding command see more version into just the command code.
Assumes the fifo was 0 before.
It should be only called when the fifo is exclusived locked or when it is secured that no other thread is accessing the fifo.
Otherwise it is dangerous and must be handled in the same way as.
The numer of elements will be rounded-up to a power of 2.
The fifo will be release with.
Return 0 if no error, otherwise an error code.
The numer of elements will be rounded-up to a power of 2.
Return 0 if no error, otherwise an error code.
It returns 0 if the fifo was full.
Otherwise it returns the number processed elements.
It returns 0 if the fifo was empty.
Otherwise it returns the number processed elements.
It returns 0 if the fifo was empty.
Otherwise it returns the number processed elements.
It returns the number entries in the scatterlist array.
The in counter will be updated by the len parameter.
No error checking will be done.
It returns the number entries in the scatterlist array.
A zero means there is no space available and the scatterlist is not filled.
The out counter will be updated by the len parameter.
No error checking will be done.
The data is not removed from the fifo.
The buffers are not freed, so any mappings are still in effect.
Creates a channel buffer for each cpu continue reading the sizes and attributes specified.
Performs sub-buffer-switch tasks such as invoking callbacks, updating padding counts, waking up readers, etc.
The channel buffer and channel buffer data structure are then freed automatically when the last reference is given up.
Use to setup files for a previously buffer-only channel.
Useful to do early tracing in kernel, before VFS is up, for example.
Note that a successful module load does not mean the module did not then unload and exit on an error of its own.
Callers must check that the service they requested is now available not blindly invoke it.
If module auto-loading support is disabled then this function becomes a no-operation.
The init function is used to customize the helper process prior to exec.
This can be used for freeing the argv and envp.
This makes it safe to call from interrupt context.
Description Runs a user-space application.
The application is started asynchronously if wait is not set, and runs as a child of system workqueues.
This makes it safe to call from interrupt context.
Description This function is the equivalent to use and.
If you use this function while holding a resource the IRQ handler may need you will deadlock.
It does not take associated threaded handlers into account.
Do not use this for shutdown scenarios where you must be sure that all parts hardirq and threaded handler have completed.
Return false if a threaded handler is active.
This function may be called - with care - from IRQ context.
If you use this function while holding a resource the IRQ handler may need you will deadlock.
This function may be called - with care - from IRQ context.
Function pointers must be initialised; the other fields will be initialised by this function.
Description Must be called in process context.
Notification may only be enabled after the IRQ is allocated and must be disabled before the IRQ is freed using.
The vCPU specific data is passed from outside, such as KVM.
Disables and Enables are nested.
Unlikethis function does not ensure existing instances of the IRQ handler have completed before returning.
This function may be called from IRQ context.
Enables and Disables are nested.
This function waits for any pending IRQ handlers for this interrupt to complete before returning.
If you use this function while holding a resource the IRQ handler may need you will deadlock.
This function may be called - with care - from IRQ context.
Enables and Disables are nested.
This function waits for any pending hard IRQ handlers for this interrupt to complete before returning.
If you use this function while holding a resource the hard IRQ handler may need you will deadlock.
When used to optimistically disable an interrupt from atomic context the return value must be checked.
Return false if a threaded handler is active.
This function may be called - with care - from IRQ context.
If this matches the last disable, processing of interrupts on this IRQ line is re-enabled.
Enables article source disables must match, just as they match for non-wakeup mode support.
The handler is removed and if the interrupt line is no longer in use by any driver it is disabled.
On a shared IRQ the caller must ensure the interrupt is disabled on the card it drives before calling this function.
The function does not return until any executing interrupts for this IRQ have completed.
This function must not be called from interrupt context.
From the point this call is made your handler function may be invoked.
Since your handler function must clear any interrupt the board raises, you must take care both to initialise your hardware and to set up the interrupt handler in the right order.
This split handler design is necessary to support shared interrupts.
Normally the address of the device data structure is used as the cookie.
Since the handler receives this value it makes sense to use it.
Threaded handler for threaded interrupts.
It selects either a hardirq or threaded handling method depending on the context.
On failure, it returns a negative value.
Returns the enable state of a per cpu interrupt on the current cpu.
The handler is removed, but the interrupt line is not disabled.
This must be done on each CPU before calling this function.
The function does not return until any executing interrupts for this IRQ have completed.
This function must not be called from interrupt context.
This function should be called with preemption disabled if the interrupt controller has per-cpu registers.
The resource will be relocated if the new size cannot be reallocated in the current location.
If a conflict happens, and the conflicting resources entirely fit within the range of the new resource, then the new resource is inserted and the conflicting resources become children of the new resource.
This function is intended for producers of resources, such as FW modules and bus drivers.
The requested region is released from a currently busy memory resource.
The requested region must either match exactly or fit into a single busy resource entry.
In the latter case, the remaining resource is adjusted accordingly.
Existing children of the busy memory resource must be immutable in the request.
Enhance this logic when necessary.
This function is intended for producers of resources, such as FW modules and bus drivers.
This function removes a resource previously inserted by orand moves the children if any up to where they were before.
Existing children of the resource are assumed to be immutable.
There is usually no need to release resources requested by this function explicitly since that will be taken care of when the device is unbound from its driver.
If for some reason the resource needs to be released explicitly, because of ordering issues for example, drivers must call rather than the regular.
When a conflict is detected between any existing resources and the linux /sys/bus/pci/slots requested resource, an error message will be printed.
Returns 0 on success or a negative error code on failure.
If PAT is unavailable, it attempts to add a WC MTRR covering size bytes starting at base and logs an error if this fails.
The called should provide a power of two size on an equivalent power of two boundary.
Some capabilities can occur several times, e.
To be 100% safe against broken PCI devices, the caller should take steps to avoid an infinite loop.
Description This function should not be called linux /sys/bus/pci/slots by device drivers.
RETURN VALUE: -EINVAL if the requested state is invalid.
This is the value that is passed to suspend function.
Description Returns PCI power state suitable for given device and given system message.
Wake up the device if it was suspended.
Beware, this function can fail.
Ask low-level code to enable Memory resources.
Wake up the device if it was suspended.
Beware, this function can fail.
Wake up the device if it was suspended.
Beware, this function can fail.
This only involves disabling PCI bus-mastering, if active.
When such events involves platform-specific hooks, those hooks are called automatically by this routine.
Devices with legacy power management no standard PCI PM capabilities always card games online blackjack such platform hooks.
Description Return true if the device itself is capable of generating wake-up events through the platform or using the native PCIe PME or if the device supports PME and one of its upstream bridges can generate wake-up events.
This traverses through all PCI-to-PCI bridges all the way up to a PCI root bus.
Call this function only after all use of the PCI regions has ceased.
Do not access any address inside the PCI regions unless this call returns successfully.
Returns 0 on success, or EBUSY on error.
A warning message is also printed on failure.
Do not access any address inside the PCI regions unless this call returns successfully.
Returns 0 on success, or EBUSY on error.
A warning message is also printed on failure.
Call this function only after all use of the PCI regions has ceased.
Call this function only after all use of the PCI regions has ceased.
Do not access any address inside the PCI regions unless this call returns successfully.
Returns 0 on success, or EBUSY on error.
A warning message is also printed on failure.
Do not access any address inside the PCI regions unless this call returns successfully.
Returns 0 on success, or EBUSY on error.
A warning message is also printed on failure.
Copyright 1998-2001 by Jes Sorensen.
Return An appropriate -ERRNO error value on error, or zero for success.
Return An appropriate -ERRNO error value on error, or zero for success.
Callers are not required to check the return value.
Return An appropriate -ERRNO error value on error, or zero for success.
False is returned if not interrupt was pending.
False is returned and the mask remains active if there was still an interrupt pending.
Devices on the secondary bus are left in power-on state.
The PCI device must be responsive to PCI config space in order to use this function.
The device function is presumed to be unused when this function is called.
Resetting the device will make the contents of PCI configuration space random, so any caller of this must be prepared to reinitialise the device including MSI, bus mastering, BARs, decoding IO and memory spaces, etc.
The PCI device must be responsive to PCI config space in order to use this function.
The device function is presumed to be unused and the caller is holding the device mutex lock when this function is called.
Resetting the device will make the contents of PCI configuration space random, so any caller of this must be prepared to reinitialise the device including MSI, bus mastering, BARs, decoding IO and memory spaces, etc.
The PCI device must be responsive to PCI config space in order to use this function.
This function does not just reset the PCI portion of a device, but clears all the state associated with the device.
For instance, some slots may support slot power control.
In the case of a 1:1 bus to slot architecture, this function may wrap the bus reset to avoid spurious slot related events such as hotplug.
Generally a slot reset should be attempted before a bus reset.
All of the function of the slot and any subordinate buses behind the slot are reset through this function.
PCI config space of all devices in the slot and behind the slot is saved before and restored after reset.
Return 0 on success, non-zero on error.
Return 0 on success, non-zero on error.
Return 0 on success, -errno on failure.
Description Used by a driver to check whether a PCI device present in the system is in its list of supported devices.
Returns a negative value on error, otherwise 0.
If no error occurred, the driver check this out registered even if no device was claimed during registration.
Drivers for PCI devices should normally record such references in their probe methods, when they bind to a device, and release them by callingin their disconnect methods.
A pointer to the device with the incremented reference counter is returned.
When the last user of the device calls this function, the memory of the device is freed.
We also remove any subordinate buses and children in a depth-first manner.
If the bus is found, a pointer to its data structure is returned.
If no bus is found, NULL is returned.
Description Iterates through the list of known PCI buses.
A new search is initiated by passing NULL as the from argument.
Otherwise if from is not NULL, searches continue from next device on the global list.
If the device is found, its reference count is increased and this function returns a pointer to its data structure.
The caller must decrement the reference count by calling.
If no device is found, NULL is returned.
If the device is found, its reference count is increased and this function returns a pointer to its data structure.
The caller must decrement the reference count by calling.
If no device is found, NULL is returned.
Description Iterates through the list of known PCI devices.
Otherwise, NULL is returned.
A new search is initiated by passing NULL as the from argument.
Otherwise if from is not NULL, searches continue from next device on the global list.
The reference count for from is always decremented if it is not NULL.
Description Iterates through the list of known PCI devices.
If a PCI device is found with a matching vendor and device, the reference count to the device is incremented and a pointer to its device structure is returned.
Otherwise, NULL is returned.
A new search is initiated by passing NULL as the from argument.
Otherwise if from is not NULL, searches continue from next device on the global list.
The reference count for from is always decremented if it is not NULL.
Description Iterates through the list of known PCI devices.
https://ipodxs.com/blackjack/how-to-build-a-blackjack-table.html a PCI device is found with a matching class, the reference count to the device is incremented and a pointer to its device structure is returned.
Otherwise, NULL is returned.
A new search is initiated by passing NULL as the from argument.
Otherwise if from is not NULL, searches continue from next device on the global list.
The reference count for from is always decremented if it is not NULL.
Description Obvious fact: You do not have tricks tips card and blackjack counting reference to any device that might be found by this function, so if that device is removed from the system right after this function is finished, the value will be stale.
Use this function to find devices that are usually built into a system, or for a general hint as to if another device happens to be present at this specific moment in time.
It returns a negative errno if the device is not capable sending MSI interrupts.
It returns a negative errno if the device is not capable of sending MSI-X interrupts.
A return of zero indicates the successful configuration of MSI-X capability structure with new allocated MSI-X irqs.
Driver should use the returned value to re-send its request.
It returns a negative errno if an error occurs.
It returns a negative errno if an error occurs.
If it succeeds, it returns the actual number of interrupts allocated and indicates the successful configuration of MSI-X capability structure with new allocated MSI-X interrupts.
Return A domain pointer or NULL in case of failure.
This function can be used from atomic contexts.
Return a suggestion for fixing it although the driver is not required to act on this.
The irq number of the new irq or a negative error value is returned.
The irq should be free before this happens.
Returns the number of new devices found.
Returns the max number of subordinate bus discovered.
There are known platforms with broken firmware that assign the same name to multiple slots.
Workaround these broken platforms by renaming the slots on behalf of the caller.
If firmware assigns name N to multiple slots: The first slot is assigned Christophe blackjack watch The second slot is assigned N-1 The third slot is assigned N-2 etc.
This involves simply turning on the last bit of the PCI ROM BAR.
Note that some cards may share address decoders between the ROM and other resources, so enabling it may disable access to MMIO registers or other card memory.
If ROM is boot video ROM, the shadow BIOS copy will be returned instead of the actual ROM.
If device is not a physical function returns 0.
Returns 0 if PF is an SRIOV-capable device and value of numvfs valid.
If not a PF return -ENOSYS; if numvfs is invalid return -EINVAL; if VFs already enabled, return -EBUSY.
Can be overridden by arch if necessary.
This routine creates the files and ties them into their associated read, write and mmap files from pci-sysfs.
Returns 0 if successful, anything else for an error.
Returns 0 if successful, anything else for an error.
Returns 0 if successful, anything else for an error.
Description Walk the blacklist table running matching functions until someone returns non zero or we hit the end.
Callback function is called for each successful match.
Returns the number of matches.
Description Walk the blacklist table until the first match is found.
Description Iterates through the list of known onboard devices.
If a device is found with a matching type and name, a pointer to its device structure is returned.
Otherwise, NULL is returned.
A new search is initiated by passing NULL as the from argument.
If from is not NULL, searches continue from next device.
Otherwise, true is returned with any invalid part of date set to zero.
This should happen right after we unregister, but just in case, we use the release callback anyway.
This method may also be used to check if your LSM is currently loaded during kernel initialization.
Return true if: -The passed LSM is the one chosen by user at boot time, -or the passed LSM is configured as the default and the user did not choose an alternate LSM at boot time.
This should be a directory dentry if set.
If this parameter is NULL, then the file will be created in the root of the securityfs filesystem.
It allows for a wide range of flexibility in creating a file, or a directory if you want to create a directory, the function is recommended to be used instead.
This function returns a pointer to a dentry if it succeeds.
This pointer must be passed to the function when the file is to be removed no automatic cleanup happens if your module is unloaded, you are responsible linux /sys/bus/pci/slots />If securityfs is not enabled in the kernel, the value -ENODEV is returned.
This should be a directory dentry if set.
If this parameter is NULL, then the directory will be created in the root of the securityfs filesystem.
Description This function creates a directory in securityfs with the given name.
This function returns a pointer to a dentry if it succeeds.
This pointer must be passed to the function when the file is to be removed no automatic cleanup happens if your module is unloaded, you are responsible here.
If an error occurs, NULL will be returned.
If securityfs is not enabled in the kernel, the value -ENODEV is returned.
It is not wise to check for this value, but rather, check for NULL or!
Description This function removes a file or directory in securityfs that was previously created with a call to another securityfs function like or variants thereof.
This function is required to be called in order for the file to be removed.
No automatic cleanup of files will happen when a module is removed; you are responsible here.
Obtain an audit buffer.
If the task ctx is a task that is currently in a syscall, then the syscall is marked as auditable and an audit record will be written at syscall exit.
If there is no associated task, then task context ctx should be NULL.
May be called in any context.
It may be called in any context.
Doing so turns on system call auditing for the specified task.
This only happens if the audit context was created when the continue reading was created and the state or filters demand the audit context be built.
In call cases, free the names stored from getname.
If not, return NULL.
Return of 0 indicates a match.
It takes the name of the file where accounting records should be written.
If the filename is NULL, accounting will be shutdown.
This function can only be called if bdev is opened and the return value is never NULL.
This function will make sure that queueing is restarted around the specified time.
Queue lock must be held.
Queue lock must be held.
Often this will not happen, because of hardware limitations queue depth settings.
This happens by calling to restart queue operations.
Queue lock must be held.
This function does not cancel any asynchronous activity arising out of elevator or throttling code.
May be used to restart request handling after a request has completed.
This variant runs the queue whether or not the queue has been stopped.
Must be called with the queue lock held and interrupts disabled.
This variant must be called with the queue lock held and interrupts disabled.
The caller must hold the queue lock.
May be used to restart queueing when a request has completed.
This function makes q enter bypass mode and drains all requests which were throttled or issued before.
All future requests will be failed immediately with -ENODEV.
The function rfn will be called when there are requests on the queue that need to be processed.
If the device supports plugging, then rfn may not be called immediately when requests are available on the queue, but may be called at some time later instead.
Plugged queues are generally unplugged when a buffer belonging to one of the requests on the queue is needed, or due to memory pressure.
If it does leave requests on the queue, it is responsible for arranging that the requests get dealt with eventually.
The queue spin lock must be held while manipulating the requests on the request queue; this lock will be taken also from interrupt context, so irq disabling is needed for it.
Note must be paired with a call when the block device is deactivated such as at module unload.
Where the struct request needs to be farther initialized by the caller.
If possible a big IO should be split into smaller parts when allocation fails.
Partial allocation should not be an error, or you risk a live-lock.
Must be called with queue lock held.
This accounts immediately for all queue usage up to the current jiffies and restarts the counters again.
Description This allows to later add a payload to an already submitted request by a block driver.
The driver needs to take care of freeing the payload itself.
Note that this is a quite horrible hack and nothing but handling of discard requests should ever use it.
This function determines the number of bytes which can be failed from the beginning of the request without crossing into area which need to be retried further.
Return The number of bytes to fail.
The returned request should be started using before LLD starts processing it.
Return Pointer to the request at the top of q if available.
This hands off the request to the linux /sys/bus/pci/slots />The request is started on return and LLD can start processing it immediately.
Return Pointer to the request at the top of q if available.
If req has leftover, sets it up for the next range of segments.
This special helper function is only for request stacking drivers e.
The queue lock is held when calling this.
If rq has leftover, sets it up for the next range of segments.
Must be called with queue lock held.
Basically, this function is used only by request stacking drivers to stop dispatching requests to underlying devices when underlying devices are busy.
Returns 0 for success, non 0 for failure.
Also, pages which the original bios are pointing to are not copied and the cloned bios just point same pages.
For instance, if the task is blocking for a memory allocation, memory reclaim could end up wanting to free a page belonging to that request that is currently residing in our private plug.
This function takes care of setting up using auto suspend for the device, the autosuspend delay is set to -1 to make runtime suspend impossible until an updated value is either set by user or by driver.
Drivers do not need to touch other autosuspend settings.
For the not allowed case, we mark last busy for the device so that runtime PM core will try to autosuspend it some time later.
This prevents processing requests from the queue.
It source be called before first request is added to the queue.
If not, only ELVPRIV requests are drained.
The caller is responsible for ensuring that no new requests which need to be drained are queued.
This function may fail under memory pressure or if q is dead.
Returns true if merge was successful, otherwise false.
Only check basic merging parameters without querying the elevator.
Since the block layer and the underlying device driver trust rq after it is inserted to q, it should be checked against q before the insertion using this generic function.
Request stacking drivers like request-based dm may change the queue limits when retrying requests on other queues.
Those requests need to be checked against the new queue limits again during dispatch.
Drivers that supports bidi can safely call this member for any type of request, bidi or uni.
Otherwise a kernel bounce buffer is used.
The original bio must be passed back in to for proper unmapping.
Otherwise a bounce buffer is used.
Can be called multiple times to append multiple buffers.
It should be called when a request queue is being released; typically when a block device is being de-registered.
Currently, its primary task it to free all the struct request please, how to deal in blackjack with that were allocated to the queue and the queue itself.
Note The low level driver must have finished any outstanding requests first via.
Should be used by stacking drivers like DM that have no internal limits.
This works well for many block devices.
However some block devices typically virtual devices such as md or lvm do not benefit from the processing on the request queue, and are served best by having the requests passed directly to them.
This can be achieved by providing a function to.
It is set by the disk driver.
Note that the chunk size must currently be a power-of-2 in sectors.
Also note that the block layer must accept a page worth of data at any offset.
So if the crossing of chunks is a hard limitation in the driver, it must still be prepared to split single page bios.
The default of 512 covers most hardware.
Low-level drivers should call this function for devices whose first sector is not naturally aligned.
For disk drives this is often the physical block size.
For RAID arrays it is often the stripe chunk size.
This is rarely reported for disk drives.
For RAID arrays it is usually the stripe width or the internal track size.
This is rarely reported for disk drives.
For RAID arrays it is usually the stripe width or the internal track size.
The stacking function will attempt to combine the values and ensure proper alignment.
Returns -1 if adding the bottom device caused misalignment.
Appending pad buffer to a request modifies the last apologise, wizard blackjack table apologise of a scatter list such that it includes the pad buffer.
Appending pad buffer to a request modifies the last entry of a scatter list such that it includes the pad buffer.
They have to have a real area of memory to transfer it into.
The use case for this is ATAPI devices in DMA mode.
What this API does is adjust the queue so that the buf is always appended silently to the scatterlist.
If the requested alignment is larger than the current alignment, then the current queue alignment is updated to the new value, otherwise it is left alone.
The design of this is to allow multiple objects driver, device, transport etc to set their respective alignments without having them interfere.
Note This function will invoke done directly if the queue is dead.
Caller can supply room for storing the error offset in case of a flush error, if they wish to.
If WAIT flag is not passed then caller may check only what request was pushed in some internal queue for later handling.
If the discard flag is set and the block device guarantees that subsequent READ operations to the block range in question will return zeroes, the blocks will be discarded.
If the block device supports the WRITE SAME command will use it to optimize the process of clearing the block range.
Otherwise the zeroing will be performed using regular WRITE calls.
Notes queue lock must be held.
Note that this function assumes that any type of request can be queued!
Notes queue lock must be held.
In this case, we will safely clear the block side of the tag queue and readd all requests to the request queue in the right order.
Notes queue lock are blackjack 21 android apk useful be held.
The scatterlist must be big enough to hold all elements.
This function can be used to check whether two gendisk devices have compatible integrity formats.
Will log the bio offset + size.
Will log the bio offset + size.
Add a trace for that action.
Add a trace for that action.
Mangling twice gives the original unblocked google sites />The original ptbl is freed using RCU callback.
Return 0 on success, -errno on failure.
Events blocking is counted and the actual unblocking happens after the matching number of unblocks are done.
Note that this intentionally does not block event checking from.
When the block count reaches zero, it starts events polling if configured.
Safe to call from irq context.
Events in mask are scheduled to be cleared from the driver.
This ignores the block count.
If found, increment reference count and return it.
Return Pointer to the found partition on success, NULL if not found.
This is primarily used for stats accounting.
Context RCU read locked.
The returned partition pointer is valid only while preemption is disabled.
The return value depends on the major input parameter.
Description Return value is zero on success, a negative error code on failure.
Returns zero or a negative error code.
Returns a -ve errno on failure.
It only helps to keep track of the different owners of devices.
The caller should normally be the one who allocated those numbers in the first place.
This function undoes what did.
A negative error code is returned on failure.
For other cases the minor number requested is used.
The structure passed is linked into the kernel and may not be destroyed until it has been unregistered.
A zero is returned on success and a negative errno code for failure.
This framework is widely used with System-On-Chip SOC platforms to support power management and various devices which may need custom clock rates.
These struct clk instances may be used to link for example a 96 MHz signal that is used to shift bits into and out of peripherals or busses, or otherwise trigger synchronous state machine transitions in system hardware.
On some systems this may be backed by hardware clock gating, where clocks are gated without being disabled in software.
Sections of chips that are powered but not clocked may be able to retain their last state.
This low power state is often called a retention mode.
This mode still incurs leakage currents, especially with finer circuit geometries, but for CMOS circuits power is mostly used by clocked state changes.
Power-aware drivers only enable their clocks when the device they manage is in active use.
Some platforms support programmable clock generators.
These can be used by more info chips of various kinds, such as other CPUs, multimedia codecs, and devices with strict requirements for interface clocking.
An entry is created whenever code registers the first notifier on a particular clk.
Make sure that your notifier callback function prints a nice big warning in case of failure.
A perfect clock returns 0.
Returns 0 on success, -EERROR otherwise.
Note that two NULL clks are treated as matching.
Must not be called from within atomic context.
The caller must balance the number of prepare and unprepare calls.
Must not be called from within atomic context.
The implementation uses dev and id to determine the clock consumer, and thereby the clock producer.
Drivers must assume that the clock source is not enabled.
The implementation uses dev and id to determine the clock consumer, and thereby the clock producer.
Drivers must assume that the clock source is not enabled.
The clock will automatically be freed when the device is unbound from the bus.
May be called from linux /sys/bus/pci/slots contexts.
Returns success 0 or negative errno.
May be called from atomic contexts.
Implementation detail: if the clock source is shared between multiple drivers, calls must be balanced by the same number of calls for the clock source to be disabled.
This is only valid once the clock source has been enabled.
Returns rounded clock rate in Hz, or negative errno.
Returns true if parent is a possible parent for clk, false otherwise.
In contrast to this function takes the device name instead of the device itself for identification.
Drivers must assume that the clock source is not enabled.
© Copyright 2016, The kernel development community.
Built with using a provided by.

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The Linux PCI/X hot-plug feature supports inserting a PCI or PCI-X card into an. have a directory in the hot-plug file system that is mounted at /sys/bus/pci/slots .


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pci_create_slot: create or increment refcount for physical PCI slot - Linux Man Pages (9)
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pci_create_slot: create or increment refcount for physical PCI slot - Linux Man Pages (9)
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UTC From: Jordan Hargrave There currently isn't an easy way to determine which PCI devices belong to system slots.
This patch adds support to read SMBIOS Type 9 System Slots.
This patch adds support to read SMBIOS Type 9 System Slots.
I'm wondering, can't you use dmidecode or libsmbios to retrieve the same information?
July 13, 2015, 3:11 p.
Eventually planning on using this for pulling slot number for identifying network cards and disk numbering for systemd -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo vger.
Neither dmidecode nor libsmbios report the slot number for devices behind bridges in a slot.
I'm wanting to use this sysfs variable to get slot numbers for systemd, so using libsmbios and dmidecode aren't very useful.
We already report the index for embedded devices in pci-label.
The SMBIOS entry for slot 3 is 40:00.
This code will provide a 'slot' sysfs variable that reports '3' for all devices under and including the bridge.
This patch adds support to read SMBIOS Type 9 System Slots.
I expected something like: - Look for DMI info that's an exact match for my D:B:D.
This patch adds support to read SMBIOS Type 9 System Slots.
This way we only need to search a single pci device for the slot.
Otherwise match any function number.
True, but it's straightforward to walk up the PCI tree in sysfs, e.
If you want this in systemd, I see why you wouldn't want a command like dmidecode.
Help me understand the problem with libsmbios.
Is it not useful because a systemd doesn't want to link with it, or b libsmbios doesn't have the right information, or c something else?
The SMBIOS entry for slot 3 is 40:00.
What if the card in slot 3 is an adapter leading to an external PCI chassis?
Wouldn't we then have a 'slot' file for every card in that linux /sys/bus/pci/slots, all containing '3'?
how old to be a blackjack dealer sounds confusing, linux /sys/bus/pci/slots it is true that they all would be connected via the system board slot 3.
If we do put something like this in the kernel, how would it relate to that hierarchy?
Could this SMBIOS stuff be integrated into that somehow?
We have a bit of a hodge-podge of slot names already, and I'd like to simplify things if we can.
Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo vger.
You have to check all functions on all devices as well on the walk to the https://ipodxs.com/blackjack/sloth-rapping-in-rio-2.html />Would it look something like this?
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of blackjack pizza and wings second chassis.
And that's not easily linux /sys/bus/pci/slots determine a parent device from the slots interface.
I'd really like something generic here.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
We aren't really converging here yet.
We need to figure out exactly what has to be done in the kernel because it can't be done in user-space.
The goal "determine which PCI devices belong to system slots" is definitely generic and useful.
We have quite a bit of slot stuff already in the kernel, and some is already exposed via sysfs, so if we're still missing what you need, it seems like the current code is off the rails somewhere and should be fixed.
Can we explore what you need in a little more detail, with some concrete examples?
A slot number seems like a user interface thing, so I'm surprised that a driver would be concerned with it.
And of course, SMBIOS is an arch-specific thing, so the driver would have to be able to get along without the slot number anyway.
Where would these IDs come from, and what sort of reporting mechanism are you looking for?
How are these structured?
Bjorn -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo vger.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless Linux /sys/bus/pci/slots had a table of the second chassis.
It's a pain to do in user space as you have to read DMI information, then traverse PCI hierarchy until you find a linux /sys/bus/pci/slots />Every utility or code that wants to match a PCI device to a SMBIOS slot must reinvent the wheel.
It then reads in all pci devices and attempts to do a mapping.
Why do this when the kernel already has this info easily available.
It's :: so you still have the problem of what about bus 43-45 that are children of bus 42.
So wrote a script:!
However free american blackjack must query every PCI Bus number in the linux /sys/bus/pci/slots to get the correct enclosure mapping.
Currently yes there is a 1:1 mapping.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
It then reads in all pci devices and attempts to do a mapping.
Yeah just verified this won't work on this config.
Currently yes there is a 1:1 mapping.
Help me understand the problem with libsmbios.
The SMBIOS entry for slot 3 is 40:00.
Unless SMBIOS had a table of the second chassis.
It then reads in all pci devices and attempts linux /sys/bus/pci/slots do a mapping.
Currently yes blackjack calculator software is a 1:1 mapping.

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X and SUSE Linux Enterprise Server 11 SPX best practices. /sys/bus/pci/slots hierarchy (as does Red Hat Enterprise Linux 6, for example), you can also obtain ...


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Add support for reading SMBIOS Slot number for PCI devices - Patchwork
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linux /sys/bus/pci/slots