[PATCH V3] cxl: Fixes for Coherent Accelerator Interface Architecture 2.0
Michael Ellerman
mpe at ellerman.id.au
Wed Jun 14 15:01:11 AEST 2017
Christophe Lombard <clombard at linux.vnet.ibm.com> writes:
> A previous set of patches "cxl: Add support for Coherent Accelerator
> Interface Architecture 2.0" has introduced a new support for the CAPI
> cards.
Which commit is that?
cheers
> These patches have been tested on Simulation environment and
> quite a bit of them have been tested on real hardware.
>
> This patch brings new fixes after a series of tests carried out on
> new equipment:
> * Add POWER9 definition.
> * Re-enable any masked interrupts when the AFU is not activated after
> resetting the AFU.
> * Remove the api cxl_is_psl8/9 which is no longer useful.
> * Do not dump CAPI1 registers.
> * Rewrite cxl_is_page_fault() function.
> * Do not register slb callack on P9.
>
> Changelog[v3]
> - Rebase to latest upstream.
> - Update the patch's header.
> - Add new test in cxl_is_page_fault().
>
> Changelog[v2]
> - Rebase to latest upstream.
> - Update cxl_is_page_fault() to handle the checkout response status.
> - Add comments.
>
> Signed-off-by: Christophe Lombard <clombard at linux.vnet.ibm.com>
> ---
> drivers/misc/cxl/context.c | 6 +++---
> drivers/misc/cxl/cxl.h | 18 +++++-------------
> drivers/misc/cxl/fault.c | 23 +++++++++++++++--------
> drivers/misc/cxl/main.c | 17 +++++++++++++----
> drivers/misc/cxl/native.c | 29 +++++++++++++++++------------
> drivers/misc/cxl/pci.c | 11 ++++-------
> 6 files changed, 57 insertions(+), 47 deletions(-)
>
> diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
> index 4472ce1..8c32040 100644
> --- a/drivers/misc/cxl/context.c
> +++ b/drivers/misc/cxl/context.c
> @@ -45,7 +45,7 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master)
> mutex_init(&ctx->mapping_lock);
> ctx->mapping = NULL;
>
> - if (cxl_is_psl8(afu)) {
> + if (cxl_is_power8()) {
> spin_lock_init(&ctx->sste_lock);
>
> /*
> @@ -189,7 +189,7 @@ int cxl_context_iomap(struct cxl_context *ctx, struct vm_area_struct *vma)
> if (start + len > ctx->afu->adapter->ps_size)
> return -EINVAL;
>
> - if (cxl_is_psl9(ctx->afu)) {
> + if (cxl_is_power9()) {
> /*
> * Make sure there is a valid problem state
> * area space for this AFU.
> @@ -324,7 +324,7 @@ static void reclaim_ctx(struct rcu_head *rcu)
> {
> struct cxl_context *ctx = container_of(rcu, struct cxl_context, rcu);
>
> - if (cxl_is_psl8(ctx->afu))
> + if (cxl_is_power8())
> free_page((u64)ctx->sstp);
> if (ctx->ff_page)
> __free_page(ctx->ff_page);
> diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
> index c8568ea..a03f8e7 100644
> --- a/drivers/misc/cxl/cxl.h
> +++ b/drivers/misc/cxl/cxl.h
> @@ -357,6 +357,7 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An = {0x0A0};
> #define CXL_PSL9_DSISR_An_PF_RGP 0x0000000000000090ULL /* PTE not found (Radix Guest (parent)) 0b10010000 */
> #define CXL_PSL9_DSISR_An_PF_HRH 0x0000000000000094ULL /* PTE not found (HPT/Radix Host) 0b10010100 */
> #define CXL_PSL9_DSISR_An_PF_STEG 0x000000000000009CULL /* PTE not found (STEG VA) 0b10011100 */
> +#define CXL_PSL9_DSISR_An_URTCH 0x00000000000000B4ULL /* Unsupported Radix Tree Configuration 0b10110100 */
>
> /****** CXL_PSL_TFC_An ******************************************************/
> #define CXL_PSL_TFC_An_A (1ull << (63-28)) /* Acknowledge non-translation fault */
> @@ -844,24 +845,15 @@ static inline bool cxl_is_power8(void)
>
> static inline bool cxl_is_power9(void)
> {
> - /* intermediate solution */
> - if (!cxl_is_power8() &&
> - (cpu_has_feature(CPU_FTRS_POWER9) ||
> - cpu_has_feature(CPU_FTR_POWER9_DD1)))
> + if (pvr_version_is(PVR_POWER9))
> return true;
> return false;
> }
>
> -static inline bool cxl_is_psl8(struct cxl_afu *afu)
> +static inline bool cxl_is_power9_dd1(void)
> {
> - if (afu->adapter->caia_major == 1)
> - return true;
> - return false;
> -}
> -
> -static inline bool cxl_is_psl9(struct cxl_afu *afu)
> -{
> - if (afu->adapter->caia_major == 2)
> + if ((pvr_version_is(PVR_POWER9)) &&
> + cpu_has_feature(CPU_FTR_POWER9_DD1))
> return true;
> return false;
> }
> diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
> index 5344448..c79e39b 100644
> --- a/drivers/misc/cxl/fault.c
> +++ b/drivers/misc/cxl/fault.c
> @@ -187,7 +187,7 @@ static struct mm_struct *get_mem_context(struct cxl_context *ctx)
>
> static bool cxl_is_segment_miss(struct cxl_context *ctx, u64 dsisr)
> {
> - if ((cxl_is_psl8(ctx->afu)) && (dsisr & CXL_PSL_DSISR_An_DS))
> + if ((cxl_is_power8() && (dsisr & CXL_PSL_DSISR_An_DS)))
> return true;
>
> return false;
> @@ -195,16 +195,23 @@ static bool cxl_is_segment_miss(struct cxl_context *ctx, u64 dsisr)
>
> static bool cxl_is_page_fault(struct cxl_context *ctx, u64 dsisr)
> {
> - if ((cxl_is_psl8(ctx->afu)) && (dsisr & CXL_PSL_DSISR_An_DM))
> - return true;
> + u64 crs; /* Translation Checkout Response Status */
>
> - if ((cxl_is_psl9(ctx->afu)) &&
> - ((dsisr & CXL_PSL9_DSISR_An_CO_MASK) &
> - (CXL_PSL9_DSISR_An_PF_SLR | CXL_PSL9_DSISR_An_PF_RGC |
> - CXL_PSL9_DSISR_An_PF_RGP | CXL_PSL9_DSISR_An_PF_HRH |
> - CXL_PSL9_DSISR_An_PF_STEG)))
> + 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;
> + }
> + }
> +
> return false;
> }
>
> diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c
> index 1703655..c1ba0d4 100644
> --- a/drivers/misc/cxl/main.c
> +++ b/drivers/misc/cxl/main.c
> @@ -329,8 +329,15 @@ static int __init init_cxl(void)
>
> cxl_debugfs_init();
>
> - if ((rc = register_cxl_calls(&cxl_calls)))
> - goto err;
> + /*
> + * we don't register the callback on P9. slb callack is only
> + * used for the PSL8 MMU and CX4.
> + */
> + if (cxl_is_power8()) {
> + rc = register_cxl_calls(&cxl_calls);
> + if (rc)
> + goto err;
> + }
>
> if (cpu_has_feature(CPU_FTR_HVMODE)) {
> cxl_ops = &cxl_native_ops;
> @@ -347,7 +354,8 @@ static int __init init_cxl(void)
>
> return 0;
> err1:
> - unregister_cxl_calls(&cxl_calls);
> + if (cxl_is_power8())
> + unregister_cxl_calls(&cxl_calls);
> err:
> cxl_debugfs_exit();
> cxl_file_exit();
> @@ -366,7 +374,8 @@ static void exit_cxl(void)
>
> cxl_debugfs_exit();
> cxl_file_exit();
> - unregister_cxl_calls(&cxl_calls);
> + if (cxl_is_power8())
> + unregister_cxl_calls(&cxl_calls);
> idr_destroy(&cxl_adapter_idr);
> }
>
> diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
> index 8d6ea97..2b2f889 100644
> --- a/drivers/misc/cxl/native.c
> +++ b/drivers/misc/cxl/native.c
> @@ -105,11 +105,16 @@ static int native_afu_reset(struct cxl_afu *afu)
> CXL_AFU_Cntl_An_RS_MASK | CXL_AFU_Cntl_An_ES_MASK,
> false);
>
> - /* Re-enable any masked interrupts */
> - serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);
> - serr &= ~CXL_PSL_SERR_An_IRQ_MASKS;
> - cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);
> -
> + /*
> + * Re-enable any masked interrupts when the AFU is not
> + * activated to avoid side effects after attaching a process
> + * in dedicated mode.
> + */
> + if (afu->current_mode == 0) {
> + serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);
> + serr &= ~CXL_PSL_SERR_An_IRQ_MASKS;
> + cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);
> + }
>
> return rc;
> }
> @@ -139,9 +144,9 @@ int cxl_psl_purge(struct cxl_afu *afu)
>
> pr_devel("PSL purge request\n");
>
> - if (cxl_is_psl8(afu))
> + if (cxl_is_power8())
> trans_fault = CXL_PSL_DSISR_TRANS;
> - if (cxl_is_psl9(afu))
> + if (cxl_is_power9())
> trans_fault = CXL_PSL9_DSISR_An_TF;
>
> if (!cxl_ops->link_ok(afu->adapter, afu)) {
> @@ -603,7 +608,7 @@ static u64 calculate_sr(struct cxl_context *ctx)
> if (!test_tsk_thread_flag(current, TIF_32BIT))
> sr |= CXL_PSL_SR_An_SF;
> }
> - if (cxl_is_psl9(ctx->afu)) {
> + if (cxl_is_power9()) {
> if (radix_enabled())
> sr |= CXL_PSL_SR_An_XLAT_ror;
> else
> @@ -1117,10 +1122,10 @@ static irqreturn_t native_handle_psl_slice_error(struct cxl_context *ctx,
>
> static bool cxl_is_translation_fault(struct cxl_afu *afu, u64 dsisr)
> {
> - if ((cxl_is_psl8(afu)) && (dsisr & CXL_PSL_DSISR_TRANS))
> + if ((cxl_is_power8()) && (dsisr & CXL_PSL_DSISR_TRANS))
> return true;
>
> - if ((cxl_is_psl9(afu)) && (dsisr & CXL_PSL9_DSISR_An_TF))
> + if ((cxl_is_power9()) && (dsisr & CXL_PSL9_DSISR_An_TF))
> return true;
>
> return false;
> @@ -1194,10 +1199,10 @@ static void native_irq_wait(struct cxl_context *ctx)
> if (ph != ctx->pe)
> return;
> dsisr = cxl_p2n_read(ctx->afu, CXL_PSL_DSISR_An);
> - if (cxl_is_psl8(ctx->afu) &&
> + if (cxl_is_power8() &&
> ((dsisr & CXL_PSL_DSISR_PENDING) == 0))
> return;
> - if (cxl_is_psl9(ctx->afu) &&
> + if (cxl_is_power9() &&
> ((dsisr & CXL_PSL9_DSISR_PENDING) == 0))
> return;
> /*
> diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
> index 6dc1ee5..1eb9859 100644
> --- a/drivers/misc/cxl/pci.c
> +++ b/drivers/misc/cxl/pci.c
> @@ -436,7 +436,7 @@ static int init_implementation_adapter_regs_psl9(struct cxl *adapter, struct pci
> /* nMMU_ID Defaults to: b’000001001’*/
> xsl_dsnctl |= ((u64)0x09 << (63-28));
>
> - if (cxl_is_power9() && !cpu_has_feature(CPU_FTR_POWER9_DD1)) {
> + if (!(cxl_is_power9_dd1())) {
> /*
> * Used to identify CAPI packets which should be sorted into
> * the Non-Blocking queues by the PHB. This field should match
> @@ -491,7 +491,7 @@ static int init_implementation_adapter_regs_psl9(struct cxl *adapter, struct pci
> cxl_p1_write(adapter, CXL_PSL9_APCDEDTYPE, 0x40000003FFFF0000ULL);
>
> /* Disable vc dd1 fix */
> - if ((cxl_is_power9() && cpu_has_feature(CPU_FTR_POWER9_DD1)))
> + if (cxl_is_power9_dd1())
> cxl_p1_write(adapter, CXL_PSL9_GP_CT, 0x0400000000000001ULL);
>
> return 0;
> @@ -1439,8 +1439,7 @@ int cxl_pci_reset(struct cxl *adapter)
> * The adapter is about to be reset, so ignore errors.
> * Not supported on P9 DD1
> */
> - if ((cxl_is_power8()) ||
> - ((cxl_is_power9() && !cpu_has_feature(CPU_FTR_POWER9_DD1))))
> + if ((cxl_is_power8()) || (!(cxl_is_power9_dd1())))
> cxl_data_cache_flush(adapter);
>
> /* pcie_warm_reset requests a fundamental pci reset which includes a
> @@ -1750,7 +1749,6 @@ static const struct cxl_service_layer_ops psl9_ops = {
> .debugfs_add_adapter_regs = cxl_debugfs_add_adapter_regs_psl9,
> .debugfs_add_afu_regs = cxl_debugfs_add_afu_regs_psl9,
> .psl_irq_dump_registers = cxl_native_irq_dump_regs_psl9,
> - .err_irq_dump_registers = cxl_native_err_irq_dump_regs,
> .debugfs_stop_trace = cxl_stop_trace_psl9,
> .write_timebase_ctrl = write_timebase_ctrl_psl9,
> .timebase_read = timebase_read_psl9,
> @@ -1889,8 +1887,7 @@ static void cxl_pci_remove_adapter(struct cxl *adapter)
> * Flush adapter datacache as its about to be removed.
> * Not supported on P9 DD1.
> */
> - if ((cxl_is_power8()) ||
> - ((cxl_is_power9() && !cpu_has_feature(CPU_FTR_POWER9_DD1))))
> + if ((cxl_is_power8()) || (!(cxl_is_power9_dd1())))
> cxl_data_cache_flush(adapter);
>
> cxl_deconfigure_adapter(adapter);
> --
> 2.7.4
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