Commit c897df0e authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

Merge tag 'v3.14-rc5' into patchwork

Linux 3.14-rc5

* tag 'v3.14-rc5': (1117 commits)
  Linux 3.14-rc5
  drm/vmwgfx: avoid null pointer dereference at failure paths
  drm/vmwgfx: Make sure backing mobs are cleared when allocated. Update driver date.
  drm/vmwgfx: Remove some unused surface formats
  MAINTAINERS: add maintainer entry for Armada DRM driver
  arm64: Fix !CONFIG_SMP kernel build
  arm64: mm: Add double logical invert to pte accessors
  dm cache: fix truncation bug when mapping I/O to >2TB fast device
  perf tools: Fix strict alias issue for find_first_bit
  powerpc/powernv: Fix indirect XSCOM unmangling
  powerpc/powernv: Fix opal_xscom_{read,write} prototype
  powerpc/powernv: Refactor PHB diag-data dump
  powerpc/powernv: Dump PHB diag-data immediately
  powerpc: Increase stack redzone for 64-bit userspace to 512 bytes
  powerpc/ftrace: bugfix for test_24bit_addr
  powerpc/crashdump : Fix page frame number check in copy_oldmem_page
  powerpc/le: Ensure that the 'stop-self' RTAS token is handled correctly
  kvm, vmx: Really fix lazy FPU on nested guest
  perf tools: fix BFD detection on opensuse
  drm/radeon: enable speaker allocation setup on dce3.2
  ...
parents 1e9c4d49 0414855f

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......@@ -92,3 +92,6 @@ extra_certificates
signing_key.priv
signing_key.x509
x509.genkey
# Kconfig presets
all.config
......@@ -29,6 +29,8 @@ DMA-ISA-LPC.txt
- How to do DMA with ISA (and LPC) devices.
DMA-attributes.txt
- listing of the various possible attributes a DMA region can have
dmatest.txt
- how to compile, configure and use the dmatest system.
DocBook/
- directory with DocBook templates etc. for kernel documentation.
EDID/
......@@ -77,6 +79,8 @@ arm/
- directory with info about Linux on the ARM architecture.
arm64/
- directory with info about Linux on the 64 bit ARM architecture.
assoc_array.txt
- generic associative array intro.
atomic_ops.txt
- semantics and behavior of atomic and bitmask operations.
auxdisplay/
......@@ -87,6 +91,8 @@ bad_memory.txt
- how to use kernel parameters to exclude bad RAM regions.
basic_profiling.txt
- basic instructions for those who wants to profile Linux kernel.
bcache.txt
- Block-layer cache on fast SSDs to improve slow (raid) I/O performance.
binfmt_misc.txt
- info on the kernel support for extra binary formats.
blackfin/
......@@ -171,6 +177,8 @@ early-userspace/
- info about initramfs, klibc, and userspace early during boot.
edac.txt
- information on EDAC - Error Detection And Correction
efi-stub.txt
- How to use the EFI boot stub to bypass GRUB or elilo on EFI systems.
eisa.txt
- info on EISA bus support.
email-clients.txt
......@@ -195,8 +203,8 @@ futex-requeue-pi.txt
- info on requeueing of tasks from a non-PI futex to a PI futex
gcov.txt
- use of GCC's coverage testing tool "gcov" with the Linux kernel
gpio.txt
- overview of GPIO (General Purpose Input/Output) access conventions.
gpio/
- gpio related documentation
hid/
- directory with information on human interface devices
highuid.txt
......@@ -255,6 +263,8 @@ kernel-docs.txt
- listing of various WWW + books that document kernel internals.
kernel-parameters.txt
- summary listing of command line / boot prompt args for the kernel.
kernel-per-CPU-kthreads.txt
- List of all per-CPU kthreads and how they introduce jitter.
kmemcheck.txt
- info on dynamic checker that detects uses of uninitialized memory.
kmemleak.txt
......@@ -299,8 +309,6 @@ memory-devices/
- directory with info on parts like the Texas Instruments EMIF driver
memory-hotplug.txt
- Hotpluggable memory support, how to use and current status.
memory.txt
- info on typical Linux memory problems.
metag/
- directory with info about Linux on Meta architecture.
mips/
......@@ -311,6 +319,8 @@ mmc/
- directory with info about the MMC subsystem
mn10300/
- directory with info about the mn10300 architecture port
module-signing.txt
- Kernel module signing for increased security when loading modules.
mtd/
- directory with info about memory technology devices (flash)
mono.txt
......@@ -343,6 +353,8 @@ pcmcia/
- info on the Linux PCMCIA driver.
percpu-rw-semaphore.txt
- RCU based read-write semaphore optimized for locking for reading
phy.txt
- Description of the generic PHY framework.
pi-futex.txt
- documentation on lightweight priority inheritance futexes.
pinctrl.txt
......@@ -431,6 +443,8 @@ sysrq.txt
- info on the magic SysRq key.
target/
- directory with info on generating TCM v4 fabric .ko modules
this_cpu_ops.txt
- List rationale behind and the way to use this_cpu operations.
thermal/
- directory with information on managing thermal issues (CPU/temp)
trace/
......@@ -469,6 +483,8 @@ wimax/
- directory with info about Intel Wireless Wimax Connections
workqueue.txt
- information on the Concurrency Managed Workqueue implementation
ww-mutex-design.txt
- Intro to Mutex wait/would deadlock handling.s
x86/x86_64/
- directory with info on Linux support for AMD x86-64 (Hammer) machines.
xtensa/
......
......@@ -82,7 +82,19 @@ Most of the hard work is done for the driver in the PCI layer. It simply
has to request that the PCI layer set up the MSI capability for this
device.
4.2.1 pci_enable_msi_range
4.2.1 pci_enable_msi
int pci_enable_msi(struct pci_dev *dev)
A successful call allocates ONE interrupt to the device, regardless
of how many MSIs the device supports. The device is switched from
pin-based interrupt mode to MSI mode. The dev->irq number is changed
to a new number which represents the message signaled interrupt;
consequently, this function should be called before the driver calls
request_irq(), because an MSI is delivered via a vector that is
different from the vector of a pin-based interrupt.
4.2.2 pci_enable_msi_range
int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
......@@ -147,6 +159,11 @@ static int foo_driver_enable_msi(struct pci_dev *pdev, int nvec)
return pci_enable_msi_range(pdev, nvec, nvec);
}
Note, unlike pci_enable_msi_exact() function, which could be also used to
enable a particular number of MSI-X interrupts, pci_enable_msi_range()
returns either a negative errno or 'nvec' (not negative errno or 0 - as
pci_enable_msi_exact() does).
4.2.1.3 Single MSI mode
The most notorious example of the request type described above is
......@@ -158,7 +175,27 @@ static int foo_driver_enable_single_msi(struct pci_dev *pdev)
return pci_enable_msi_range(pdev, 1, 1);
}
4.2.2 pci_disable_msi
Note, unlike pci_enable_msi() function, which could be also used to
enable the single MSI mode, pci_enable_msi_range() returns either a
negative errno or 1 (not negative errno or 0 - as pci_enable_msi()
does).
4.2.3 pci_enable_msi_exact
int pci_enable_msi_exact(struct pci_dev *dev, int nvec)
This variation on pci_enable_msi_range() call allows a device driver to
request exactly 'nvec' MSIs.
If this function returns a negative number, it indicates an error and
the driver should not attempt to request any more MSI interrupts for
this device.
By contrast with pci_enable_msi_range() function, pci_enable_msi_exact()
returns zero in case of success, which indicates MSI interrupts have been
successfully allocated.
4.2.4 pci_disable_msi
void pci_disable_msi(struct pci_dev *dev)
......@@ -172,7 +209,7 @@ on any interrupt for which it previously called request_irq().
Failure to do so results in a BUG_ON(), leaving the device with
MSI enabled and thus leaking its vector.
4.2.3 pci_msi_vec_count
4.2.4 pci_msi_vec_count
int pci_msi_vec_count(struct pci_dev *dev)
......@@ -257,8 +294,8 @@ possible, likely up to the limit returned by pci_msix_vec_count() function:
static int foo_driver_enable_msix(struct foo_adapter *adapter, int nvec)
{
return pci_enable_msi_range(adapter->pdev, adapter->msix_entries,
1, nvec);
return pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
1, nvec);
}
Note the value of 'minvec' parameter is 1. As 'minvec' is inclusive,
......@@ -269,8 +306,8 @@ In this case the function could look like this:
static int foo_driver_enable_msix(struct foo_adapter *adapter, int nvec)
{
return pci_enable_msi_range(adapter->pdev, adapter->msix_entries,
FOO_DRIVER_MINIMUM_NVEC, nvec);
return pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
FOO_DRIVER_MINIMUM_NVEC, nvec);
}
4.3.1.2 Exact number of MSI-X interrupts
......@@ -282,10 +319,15 @@ parameters:
static int foo_driver_enable_msix(struct foo_adapter *adapter, int nvec)
{
return pci_enable_msi_range(adapter->pdev, adapter->msix_entries,
nvec, nvec);
return pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
nvec, nvec);
}
Note, unlike pci_enable_msix_exact() function, which could be also used to
enable a particular number of MSI-X interrupts, pci_enable_msix_range()
returns either a negative errno or 'nvec' (not negative errno or 0 - as
pci_enable_msix_exact() does).
4.3.1.3 Specific requirements to the number of MSI-X interrupts
As noted above, there could be devices that can not operate with just any
......@@ -332,7 +374,64 @@ Note how pci_enable_msix_range() return value is analized for a fallback -
any error code other than -ENOSPC indicates a fatal error and should not
be retried.
4.3.2 pci_disable_msix
4.3.2 pci_enable_msix_exact
int pci_enable_msix_exact(struct pci_dev *dev,
struct msix_entry *entries, int nvec)
This variation on pci_enable_msix_range() call allows a device driver to
request exactly 'nvec' MSI-Xs.
If this function returns a negative number, it indicates an error and
the driver should not attempt to allocate any more MSI-X interrupts for
this device.
By contrast with pci_enable_msix_range() function, pci_enable_msix_exact()
returns zero in case of success, which indicates MSI-X interrupts have been
successfully allocated.
Another version of a routine that enables MSI-X mode for a device with
specific requirements described in chapter 4.3.1.3 might look like this:
/*
* Assume 'minvec' and 'maxvec' are non-zero
*/
static int foo_driver_enable_msix(struct foo_adapter *adapter,
int minvec, int maxvec)
{
int rc;
minvec = roundup_pow_of_two(minvec);
maxvec = rounddown_pow_of_two(maxvec);
if (minvec > maxvec)
return -ERANGE;
retry:
rc = pci_enable_msix_exact(adapter->pdev,
adapter->msix_entries, maxvec);
/*
* -ENOSPC is the only error code allowed to be analyzed
*/
if (rc == -ENOSPC) {
if (maxvec == 1)
return -ENOSPC;
maxvec /= 2;
if (minvec > maxvec)
return -ENOSPC;
goto retry;
} else if (rc < 0) {
return rc;
}
return maxvec;
}
4.3.3 pci_disable_msix
void pci_disable_msix(struct pci_dev *dev)
......
......@@ -8,6 +8,8 @@ listRCU.txt