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2020-12-04ocxl: Update the Process Element EntryChristophe Lombard1-1/+1
To complete the MMIO based mechanism, the fields: PASID, bus, device and function of the Process Element Entry have to be filled. (See OpenCAPI Power Platform Architecture document) Hypervisor Process Element Entry Word 0 1 .... 7 8 ...... 12 13 ..15 16.... 19 20 ........... 31 0 OSL Configuration State (0:31) 1 OSL Configuration State (32:63) 2 PASID | Reserved 3 Bus | Device |Function | Reserved 4 Reserved 5 Reserved 6 .... Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201125155013.39955-4-clombard@linux.vnet.ibm.com
2020-08-25ocxl: Don't return trigger page when allocating an interruptFrederic Barrat1-8/+2
Existing users of ocxl_link_irq_alloc() have been converted to obtain the trigger page of an interrupt through xive directly, we therefore have no need to return the trigger page when allocating an interrupt. It also allows ocxl to use the xive native interface to allocate interrupts, instead of its custom service. Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200403153838.29224-4-fbarrat@linux.ibm.com
2020-07-29ocxl: Address kernel doc errors & warningsAlastair D'Silva1-58/+38
This patch addresses warnings and errors from the kernel doc scripts for the OpenCAPI driver. It also makes minor tweaks to make the docs more consistent. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200415012343.919255-3-alastair@d-silva.org
2020-07-29ocxl: Remove unnecessary externsAlastair D'Silva1-3/+3
Function declarations don't need externs, remove the existing ones so they are consistent with newer code Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Andrew Donnellan <ajd@linux.ibm.com> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200415012343.919255-2-alastair@d-silva.org
2019-07-10ocxl: Update for AFU descriptor template version 1.1Alastair D'Silva1-1/+4
The OpenCAPI discovery and configuration specification has been updated and introduces version 1.1 of the AFU descriptor template, with new fields to better define the memory layout of an OpenCAPI adapter. The ocxl driver doesn't do much yet to support LPC memory but as we start seeing (non-LPC) AFU images using the new template, this patch updates the config space parsing code to avoid spitting a warning. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com> Reviewed-by: Christophe Lombard <clombard@linux.vnet.ibm.com> Acked-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190605111545.19762-1-fbarrat@linux.ibm.com
2019-05-03ocxl: Provide global MMIO accessors for external driversAlastair D'Silva1-0/+110
External drivers that communicate via OpenCAPI will need to make MMIO calls to interact with the devices. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03ocxl: move event_fd handling to frontendAlastair D'Silva1-0/+46
Event_fd is only used in the driver frontend, so it does not need to exist in the backend code. Relocate it to the frontend and provide an opaque mechanism for consumers instead. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03ocxl: Allow external drivers to use OpenCAPI contextsAlastair D'Silva1-0/+39
Most OpenCAPI operations require a valid context, so exposing these functions to external drivers is necessary. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03ocxl: Create a clear delineation between ocxl backend & frontendAlastair D'Silva1-10/+109
The OCXL driver contains both frontend code for interacting with userspace, as well as backend code for interacting with the hardware. This patch separates the backend code from the frontend so that it can be used by other device drivers that communicate via OpenCAPI. Relocate dev, cdev & sysfs files to the frontend code to allow external drivers to maintain their own devices. Reference counting on the device in the backend is replaced with kref counting. Move file & sysfs layer initialisation from core.c (backend) to pci.c (frontend). Create an ocxl_function oriented interface for initing devices & enumerating AFUs. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03ocxl: Remove some unused exported symbolsAlastair D'Silva1-23/+0
Remove some unused exported symbols. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-03ocxl: Remove superfluous 'extern' from headersAlastair D'Silva1-18/+18
The 'extern' keyword adds no value here. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Reviewed-by: Greg Kurz <groug@kaod.org> Acked-by: Frederic Barrat <fbarrat@linux.ibm.com> Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-06-03ocxl: Expose the thread_id needed for wait on POWER9Alastair D'Silva1-0/+9
In order to successfully issue as_notify, an AFU needs to know the TID to notify, which in turn means that this information should be available in userspace so it can be communicated to the AFU. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-01-24ocxl: Add a kernel API for other opencapi driversFrederic Barrat1-0/+214
Some of the functions done by the generic driver should also be needed by other opencapi drivers: attaching a context to an adapter, translation fault handling, AFU interrupt allocation... So to avoid code duplication, the driver provides a kernel API that other drivers can use, similar to calling a in-kernel library. It is still a bit theoretical, for lack of real hardware, and will likely need adjustements down the road. But we used the cxlflash driver as a guinea pig. Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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