linux-toradex.git/drivers/misc/ocxl/link.c, branch v6.0-rc2

cxl/ocxl: Prepare cleanup of powerpc's asm/prom.h

2022-05-11T13:06:39+00:00

powerpc's asm/prom.h brings some headers that it doesn't
need itself.

In order to clean it up, first add missing headers in
users of asm/prom.h

Signed-off-by: Christophe Leroy 
Acked-by: Frederic Barrat 
Acked-by: Andrew Donnellan 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/a2bae89b280e7a7cb87889635d9911d6a245e780.1648833388.git.christophe.leroy@csgroup.eu

ocxl: Make use of the helper macro LIST_HEAD()

2022-02-25T11:09:56+00:00

Replace "struct list_head head = LIST_HEAD_INIT(head)" with
"LIST_HEAD(head)" to simplify the code.

Acked-by: Frederic Barrat 
Acked-by: Andrew Donnellan 
Signed-off-by: Cai Huoqing 
Link: https://lore.kernel.org/r/20220209032421.37725-1-cai.huoqing@linux.dev
Signed-off-by: Greg Kroah-Hartman

ocxl: Add new kernel traces

2020-12-03T14:01:30+00:00

Add specific kernel traces which provide information on mmu notifier and on
pages range.

Signed-off-by: Christophe Lombard 
Acked-by: Frederic Barrat 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20201125155013.39955-6-clombard@linux.vnet.ibm.com

ocxl: Add mmu notifier

2020-12-03T14:01:30+00:00

Add invalidate_range mmu notifier, when required (ATSD access of MMIO
registers is available), to initiate TLB invalidation commands.
For the time being, the ATSD0 set of registers is used by default.

The pasid and bdf values have to be configured in the Process Element
Entry.
The PEE must be set up to match the BDF/PASID of the AFU.

Signed-off-by: Christophe Lombard 
Acked-by: Frederic Barrat 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20201125155013.39955-5-clombard@linux.vnet.ibm.com

ocxl: Update the Process Element Entry

2020-12-03T14:01:30+00:00

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 
Acked-by: Frederic Barrat 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20201125155013.39955-4-clombard@linux.vnet.ibm.com

ocxl: Don't return trigger page when allocating an interrupt

2020-08-24T15:31:31+00:00

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 
Reviewed-by: Cédric Le Goater 
Reviewed-by: Greg Kurz 
Acked-by: Andrew Donnellan 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200403153838.29224-4-fbarrat@linux.ibm.com

ocxl: Allow contexts to be attached with a NULL mm

2019-07-03T19:29:47+00:00

If an OpenCAPI context is to be used directly by a kernel driver, there
may not be a suitable mm to use.

The patch makes the mm parameter to ocxl_context_attach optional.

Signed-off-by: Alastair D'Silva 
Acked-by: Andrew Donnellan 
Acked-by: Frederic Barrat 
Acked-by: Nicholas Piggin 
Link: https://lore.kernel.org/r/20190620041203.12274-1-alastair@au1.ibm.com
Signed-off-by: Greg Kroah-Hartman

ocxl: Rename struct link to ocxl_link

2019-05-02T16:55:00+00:00

The term 'link' is ambiguous (especially when the struct is used for a
list), so rename it for clarity.

Signed-off-by: Alastair D'Silva 
Reviewed-by: Greg Kurz 
Acked-by: Frederic Barrat 
Acked-by: Andrew Donnellan 
Signed-off-by: Michael Ellerman

ocxl: remove set but not used variables 'tid' and 'lpid'

2019-05-01T02:09:27+00:00

Fixes gcc '-Wunused-but-set-variable' warning:

  drivers/misc/ocxl/link.c: In function 'xsl_fault_handler':
  drivers/misc/ocxl/link.c:187:17: warning: variable 'tid' set but not used
  drivers/misc/ocxl/link.c:187:6: warning: variable 'lpid' set but not used

They are never used and can be removed.

Signed-off-by: YueHaibing 
Reviewed-by: Mukesh Ojha 
Acked-by: Andrew Donnellan 
Acked-by: Frederic Barrat 
Signed-off-by: Michael Ellerman

powerpc/mm/hash64: Map all the kernel regions in the same 0xc range

2019-04-21T13:12:39+00:00

This patch maps vmalloc, IO and vmemap regions in the 0xc address range
instead of the current 0xd and 0xf range. This brings the mapping closer
to radix translation mode.

With hash 64K page size each of this region is 512TB whereas with 4K config
we are limited by the max page table range of 64TB and hence there regions
are of 16TB size.

The kernel mapping is now:

 On 4K hash

     kernel_region_map_size = 16TB
     kernel vmalloc start   = 0xc000100000000000
     kernel IO start        = 0xc000200000000000
     kernel vmemmap start   = 0xc000300000000000

64K hash, 64K radix and 4k radix:

     kernel_region_map_size = 512TB
     kernel vmalloc start   = 0xc008000000000000
     kernel IO start        = 0xc00a000000000000
     kernel vmemmap start   = 0xc00c000000000000

Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Michael Ellerman