xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/powernv: Capture actag information for the device

Browse Source 
In the opencapi protocol, host memory contexts are referenced by a
'actag'. During setup, a driver must tell the device how many actags
it can used, and what values are acceptable.

On POWER9, the NPU can handle 64 actags per link, so they must be
shared between all the PCI functions of the link. To get a global
picture of how many actags are used by each AFU of every function, we
capture some data at the end of PCI enumeration, so that actags can be
shared fairly if needed.

This is not powernv specific per say, but rather a consequence of the
opencapi configuration specification being quite general. The number
of available actags on POWER9 makes it more likely to be hit. This is
somewhat mitigated by the fact that existing AFUs are coded by
requesting a reasonable count of actags and existing devices carry
only one AFU.

Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Frederic Barrat
2018-01-23 12:31:40 +01:00
committed by Michael Ellerman
parent 6914c75711
commit 2cb3d64b26
3 changed files with 354 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/include/asm/pnv-ocxl.h
View File

@@ -9,6 +9,10 @@
#define PNV_OCXL_TL_BITS_PER_RATE 4
#define PNV_OCXL_TL_RATE_BUF_SIZE ((PNV_OCXL_TL_MAX_TEMPLATE+1) * PNV_OCXL_TL_BITS_PER_RATE / 8)
extern int pnv_ocxl_get_actag(struct pci_dev *dev, u16 *base, u16 *enabled,
u16 *supported);
extern int pnv_ocxl_get_pasid_count(struct pci_dev *dev, int *count);
extern int pnv_ocxl_get_tl_cap(struct pci_dev *dev, long *cap,
char *rate_buf, int rate_buf_size);
extern int pnv_ocxl_set_tl_conf(struct pci_dev *dev, long cap,