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docs: powerpc: fix some issues at vas-api.rst
There are a few issues on this document, when built via the
building with ``make htmldocs``:
Documentation/powerpc/vas-api.rst:116: WARNING: Unexpected indentation.
Documentation/powerpc/vas-api.rst:116: WARNING: Inline emphasis start-string without end-string.
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Fixes: c12e38b1d5 ("Documentation/powerpc: VAS API")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/fc1138e563bc3a41a9e59b5dd1fe2f6a4bfad253.1592895969.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Mauro Carvalho Chehab
Jonathan Corbet
parent
72a3e3e25a
commit
cadcb83f8d
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@ -87,6 +87,7 @@ Applications may chose a specific instance of the NX co-processor using
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the vas_id field in the VAS_TX_WIN_OPEN ioctl as detailed below.
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A userspace library libnxz is available here but still in development:
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https://github.com/abalib/power-gzip
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Applications that use inflate / deflate calls can link with libnxz
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@ -110,6 +111,7 @@ Applications should use the VAS_TX_WIN_OPEN ioctl as follows to establish
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a connection with NX co-processor engine:
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::
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struct vas_tx_win_open_attr {
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__u32 version;
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__s16 vas_id; /* specific instance of vas or -1
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@ -119,8 +121,10 @@ a connection with NX co-processor engine:
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__u64 reserved2[6];
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};
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version: The version field must be currently set to 1.
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vas_id: If '-1' is passed, kernel will make a best-effort attempt
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version:
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The version field must be currently set to 1.
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vas_id:
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If '-1' is passed, kernel will make a best-effort attempt
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to assign an optimal instance of NX for the process. To
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select the specific VAS instance, refer
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"Discovery of available VAS engines" section below.
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@ -129,7 +133,8 @@ a connection with NX co-processor engine:
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and must be set to 0.
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The attributes attr for the VAS_TX_WIN_OPEN ioctl are defined as
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follows:
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follows::
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#define VAS_MAGIC 'v'
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#define VAS_TX_WIN_OPEN _IOW(VAS_MAGIC, 1,
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struct vas_tx_win_open_attr)
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@ -141,6 +146,8 @@ a connection with NX co-processor engine:
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returns -1 and sets the errno variable to indicate the error.
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Error conditions:
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====== ================================================
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EINVAL fd does not refer to a valid VAS device.
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EINVAL Invalid vas ID
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EINVAL version is not set with proper value
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@ -149,6 +156,7 @@ a connection with NX co-processor engine:
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ENOSPC System has too many active windows (connections)
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opened
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EINVAL reserved fields are not set to 0.
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====== ================================================
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See the ioctl(2) man page for more details, error codes and
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restrictions.
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@ -158,11 +166,13 @@ mmap() NX-GZIP device
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The mmap() system call for a NX-GZIP device fd returns a paste_address
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that the application can use to copy/paste its CRB to the hardware engines.
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::
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paste_addr = mmap(addr, size, prot, flags, fd, offset);
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Only restrictions on mmap for a NX-GZIP device fd are:
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* size should be PAGE_SIZE
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* offset parameter should be 0ULL
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@ -170,10 +180,12 @@ that the application can use to copy/paste its CRB to the hardware engines.
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In addition to the error conditions listed on the mmap(2) man
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page, can also fail with one of the following error codes:
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====== =============================================
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EINVAL fd is not associated with an open window
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(i.e mmap() does not follow a successful call
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to the VAS_TX_WIN_OPEN ioctl).
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EINVAL offset field is not 0ULL.
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====== =============================================
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Discovery of available VAS engines
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==================================
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@ -210,7 +222,7 @@ In case if NX encounters translation error (called NX page fault) on CSB
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address or any request buffer, raises an interrupt on the CPU to handle the
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fault. Page fault can happen if an application passes invalid addresses or
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request buffers are not in memory. The operating system handles the fault by
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updating CSB with the following data:
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updating CSB with the following data::
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csb.flags = CSB_V;
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csb.cc = CSB_CC_TRANSLATION;
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@ -223,7 +235,7 @@ the application can resend this request to NX.
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If the OS can not update CSB due to invalid CSB address, sends SEGV signal
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to the process who opened the send window on which the original request was
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issued. This signal returns with the following siginfo struct:
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issued. This signal returns with the following siginfo struct::
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siginfo.si_signo = SIGSEGV;
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siginfo.si_errno = EFAULT;
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@ -248,6 +260,7 @@ Simple example
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==============
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::
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int use_nx_gzip()
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{
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int rc, fd;
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