Merge branch 'perf/urgent' into perf/core (ff5a7088) · Commits · e / devices / android_kernel_oneplus_sm7250

.gitignore

+3 −0

Original line number	Diff line number	Diff line
		@@ -92,3 +92,6 @@ extra_certificates
		signing_key.priv
		signing_key.x509
		x509.genkey

		# Kconfig presets
		all.config

Documentation/00-INDEX

+20 −4

Original line number	Diff line number	Diff line
		@@ -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/

Documentation/PCI/MSI-HOWTO.txt

+109 −10

Original line number	Diff line number	Diff line
		@@ -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)

		@@ -257,7 +294,7 @@ 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,
		return pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
		1, nvec);
		}

		@@ -269,7 +306,7 @@ 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,
		return pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
		FOO_DRIVER_MINIMUM_NVEC, nvec);
		}

		@@ -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,
		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)

Documentation/RCU/00-INDEX

+2 −0

Original line number	Diff line number	Diff line
		@@ -8,6 +8,8 @@ listRCU.txt
		- Using RCU to Protect Read-Mostly Linked Lists
		lockdep.txt
		- RCU and lockdep checking
		lockdep-splat.txt
		- RCU Lockdep splats explained.
		NMI-RCU.txt
		- Using RCU to Protect Dynamic NMI Handlers
		rcubarrier.txt

Documentation/arm/00-INDEX

+14 −0

Original line number	Diff line number	Diff line
		@@ -4,6 +4,8 @@ Booting
		- requirements for booting
		Interrupts
		- ARM Interrupt subsystem documentation
		IXP4xx
		- Intel IXP4xx Network processor.
		msm
		- MSM specific documentation
		Netwinder
		@@ -24,8 +26,16 @@ SPEAr
		- ST SPEAr platform Linux Overview
		VFP/
		- Release notes for Linux Kernel Vector Floating Point support code
		cluster-pm-race-avoidance.txt
		- Algorithm for CPU and Cluster setup/teardown
		empeg/
		- Ltd's Empeg MP3 Car Audio Player
		firmware.txt
		- Secure firmware registration and calling.
		kernel_mode_neon.txt
		- How to use NEON instructions in kernel mode
		kernel_user_helpers.txt
		- Helper functions in kernel space made available for userspace.
		mem_alignment
		- alignment abort handler documentation
		memory.txt
		@@ -34,3 +44,7 @@ nwfpe/
		- NWFPE floating point emulator documentation
		swp_emulation
		- SWP/SWPB emulation handler/logging description
		tcm.txt
		- ARM Tightly Coupled Memory
		vlocks.txt
		- Voting locks, low-level mechanism relying on memory system atomic writes.