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cxl: Add support for POWER9 DD2 

The PSL initialization sequence has been updated to DD2.
This patch adapts to the changes, retaining compatibility with DD1.
The patch includes some changes to DD1 fix-ups as well.

Tests performed on some of the old/new hardware.

The function is_page_fault(), for POWER9, lists the Translation Checkout
Responses where the page fault will be handled by copro_handle_mm_fault().
This list is too restrictive and not necessary.

This patches removes this restriction and all page faults, whatever the
reason, will be handled. In this case, the interruption is always
acknowledged.

The following features will be added soon:
- phb reset when switching to capi mode.
- cxllib update to support new functions.

Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>

Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Lombard 2017-09-08 15:52:11 +02:00 committed by Michael Ellerman
parent 4ca360f3db
commit 5632874311
3 changed files with 28 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/misc/cxl/cxl.h
View File

@ -100,6 +100,8 @@ static const cxl_p1_reg_t CXL_XSL_FEC = {0x0158};
static const cxl_p1_reg_t CXL_XSL_DSNCTL = {0x0168};
/* PSL registers - CAIA 2 */
static const cxl_p1_reg_t CXL_PSL9_CONTROL = {0x0020};
static const cxl_p1_reg_t CXL_XSL9_INV = {0x0110};
static const cxl_p1_reg_t CXL_XSL9_DEF = {0x0140};
static const cxl_p1_reg_t CXL_XSL9_DSNCTL = {0x0168};
static const cxl_p1_reg_t CXL_PSL9_FIR1 = {0x0300};
static const cxl_p1_reg_t CXL_PSL9_FIR2 = {0x0308};

15
drivers/misc/cxl/fault.c
View File

@ -220,22 +220,11 @@ static bool cxl_is_segment_miss(struct cxl_context *ctx, u64 dsisr)
static bool cxl_is_page_fault(struct cxl_context *ctx, u64 dsisr)
{
u64 crs; /* Translation Checkout Response Status */
if ((cxl_is_power8()) && (dsisr & CXL_PSL_DSISR_An_DM))
return true;
if (cxl_is_power9()) {
crs = (dsisr & CXL_PSL9_DSISR_An_CO_MASK);
if ((crs == CXL_PSL9_DSISR_An_PF_SLR) ||
(crs == CXL_PSL9_DSISR_An_PF_RGC) ||
(crs == CXL_PSL9_DSISR_An_PF_RGP) ||
(crs == CXL_PSL9_DSISR_An_PF_HRH) ||
(crs == CXL_PSL9_DSISR_An_PF_STEG) ||
(crs == CXL_PSL9_DSISR_An_URTCH)) {
return true;
}
}
if (cxl_is_power9())
return true;
return false;
}

47
drivers/misc/cxl/pci.c
View File

@ -401,7 +401,8 @@ int cxl_calc_capp_routing(struct pci_dev *dev, u64 *chipid,
*capp_unit_id = get_capp_unit_id(np, *phb_index);
of_node_put(np);
if (!*capp_unit_id) {
pr_err("cxl: invalid capp unit id\n");
pr_err("cxl: invalid capp unit id (phb_index: %d)\n",
*phb_index);
return -ENODEV;
}
@ -475,37 +476,37 @@ static int init_implementation_adapter_regs_psl9(struct cxl *adapter,
psl_fircntl |= 0x1ULL; /* ce_thresh */
cxl_p1_write(adapter, CXL_PSL9_FIR_CNTL, psl_fircntl);
/* vccredits=0x1 pcklat=0x4 */
cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0000000000001810ULL);
/*
* For debugging with trace arrays.
* Configure RX trace 0 segmented mode.
* Configure CT trace 0 segmented mode.
* Configure LA0 trace 0 segmented mode.
* Configure LA1 trace 0 segmented mode.
/* Setup the PSL to transmit packets on the PCIe before the
* CAPP is enabled
*/
cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000000ULL);
cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000003ULL);
cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000005ULL);
cxl_p1_write(adapter, CXL_PSL9_TRACECFG, 0x8040800080000006ULL);
cxl_p1_write(adapter, CXL_PSL9_DSNDCTL, 0x0001001000002A10ULL);
/*
* A response to an ASB_Notify request is returned by the
* system as an MMIO write to the address defined in
* the PSL_TNR_ADDR register
* the PSL_TNR_ADDR register.
* keep the Reset Value: 0x00020000E0000000
*/
/* PSL_TNR_ADDR */
/* NORST */
cxl_p1_write(adapter, CXL_PSL9_DEBUG, 0x8000000000000000ULL);
/* Enable XSL rty limit */
cxl_p1_write(adapter, CXL_XSL9_DEF, 0x51F8000000000005ULL);
/* allocate the apc machines */
cxl_p1_write(adapter, CXL_PSL9_APCDEDTYPE, 0x40000003FFFF0000ULL);
/* Change XSL_INV dummy read threshold */
cxl_p1_write(adapter, CXL_XSL9_INV, 0x0000040007FFC200ULL);
/* Disable vc dd1 fix */
if (cxl_is_power9_dd1())
cxl_p1_write(adapter, CXL_PSL9_GP_CT, 0x0400000000000001ULL);
if (phb_index == 3) {
/* disable machines 31-47 and 20-27 for DMA */
cxl_p1_write(adapter, CXL_PSL9_APCDEDTYPE, 0x40000FF3FFFF0000ULL);
}
/* Snoop machines */
cxl_p1_write(adapter, CXL_PSL9_APCDEDALLOC, 0x800F000200000000ULL);
if (cxl_is_power9_dd1()) {
/* Disabling deadlock counter CAR */
cxl_p1_write(adapter, CXL_PSL9_GP_CT, 0x0020000000000001ULL);
} else
cxl_p1_write(adapter, CXL_PSL9_DEBUG, 0x4000000000000000ULL);
return 0;
}