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Thu, 17 Jun 2021 20:35:25 +0000 (GMT) Received: from b01ledav002.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 186CB124054; Thu, 17 Jun 2021 20:35:24 +0000 (GMT) Received: from localhost.localdomain (unknown [9.160.180.39]) by b01ledav002.gho.pok.ibm.com (Postfix) with ESMTP; Thu, 17 Jun 2021 20:35:23 +0000 (GMT) Message-ID: <40fb02a4d56ca4e240b074a15029082055be5997.camel@linux.ibm.com> Subject: [PATCH v6 10/17] powerpc/pseries/vas: Add hcall wrappers for VAS handling From: Haren Myneni To: linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org, mpe@ellerman.id.au, herbert@gondor.apana.org.au, npiggin@gmail.com Cc: hbabu@us.ibm.com, haren@us.ibm.com Date: Thu, 17 Jun 2021 13:35:22 -0700 In-Reply-To: <827bf56dce09620ebecd8a00a5f97105187a6205.camel@linux.ibm.com> References: <827bf56dce09620ebecd8a00a5f97105187a6205.camel@linux.ibm.com> User-Agent: Evolution 3.36.2 (3.36.2-1.fc32) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: PJJQPyBd3JvWMFAa88SGdQHBGZMRljh7 X-Proofpoint-ORIG-GUID: 2G0CwOVCwbLXYdUI3hNVxHAHGwr4FCq0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-06-17_16:2021-06-15,2021-06-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=999 phishscore=0 priorityscore=1501 mlxscore=0 malwarescore=0 adultscore=0 impostorscore=0 clxscore=1015 spamscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2106170123 Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org This patch adds the following hcall wrapper functions to allocate, modify and deallocate VAS windows, and retrieve VAS capabilities. H_ALLOCATE_VAS_WINDOW: Allocate VAS window H_DEALLOCATE_VAS_WINDOW: Close VAS window H_MODIFY_VAS_WINDOW: Setup window before using H_QUERY_VAS_CAPABILITIES: Get VAS capabilities Signed-off-by: Haren Myneni Reviewed-by: Nicholas Piggin --- arch/powerpc/platforms/pseries/vas.c | 147 +++++++++++++++++++++++++++ 1 file changed, 147 insertions(+) create mode 100644 arch/powerpc/platforms/pseries/vas.c diff --git a/arch/powerpc/platforms/pseries/vas.c b/arch/powerpc/platforms/pseries/vas.c new file mode 100644 index 000000000000..a73d7d00bf55 --- /dev/null +++ b/arch/powerpc/platforms/pseries/vas.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2020-21 IBM Corp. + */ + +#define pr_fmt(fmt) "vas: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include "vas.h" + +#define VAS_INVALID_WIN_ADDRESS 0xFFFFFFFFFFFFFFFFul +#define VAS_DEFAULT_DOMAIN_ID 0xFFFFFFFFFFFFFFFFul +/* The hypervisor allows one credit per window right now */ +#define DEF_WIN_CREDS 1 + +static long hcall_return_busy_check(long rc) +{ + /* Check if we are stalled for some time */ + if (H_IS_LONG_BUSY(rc)) { + msleep(get_longbusy_msecs(rc)); + rc = H_BUSY; + } else if (rc == H_BUSY) { + cond_resched(); + } + + return rc; +} + +/* + * Allocate VAS window hcall + */ +static int h_allocate_vas_window(struct pseries_vas_window *win, u64 *domain, + u8 wintype, u16 credits) +{ + long retbuf[PLPAR_HCALL9_BUFSIZE] = {0}; + long rc; + + do { + rc = plpar_hcall9(H_ALLOCATE_VAS_WINDOW, retbuf, wintype, + credits, domain[0], domain[1], domain[2], + domain[3], domain[4], domain[5]); + + rc = hcall_return_busy_check(rc); + } while (rc == H_BUSY); + + if (rc == H_SUCCESS) { + if (win->win_addr == VAS_INVALID_WIN_ADDRESS) { + pr_err("H_ALLOCATE_VAS_WINDOW: COPY/PASTE is not supported\n"); + return -ENOTSUPP; + } + win->vas_win.winid = retbuf[0]; + win->win_addr = retbuf[1]; + win->complete_irq = retbuf[2]; + win->fault_irq = retbuf[3]; + return 0; + } + + pr_err("H_ALLOCATE_VAS_WINDOW error: %ld, wintype: %u, credits: %u\n", + rc, wintype, credits); + + return -EIO; +} + +/* + * Deallocate VAS window hcall. + */ +static int h_deallocate_vas_window(u64 winid) +{ + long rc; + + do { + rc = plpar_hcall_norets(H_DEALLOCATE_VAS_WINDOW, winid); + + rc = hcall_return_busy_check(rc); + } while (rc == H_BUSY); + + if (rc == H_SUCCESS) + return 0; + + pr_err("H_DEALLOCATE_VAS_WINDOW error: %ld, winid: %llu\n", + rc, winid); + return -EIO; +} + +/* + * Modify VAS window. + * After the window is opened with allocate window hcall, configure it + * with flags and LPAR PID before using. + */ +static int h_modify_vas_window(struct pseries_vas_window *win) +{ + long rc; + u32 lpid = mfspr(SPRN_PID); + + /* + * AMR value is not supported in Linux VAS implementation. + * The hypervisor ignores it if 0 is passed. + */ + do { + rc = plpar_hcall_norets(H_MODIFY_VAS_WINDOW, + win->vas_win.winid, lpid, 0, + VAS_MOD_WIN_FLAGS, 0); + + rc = hcall_return_busy_check(rc); + } while (rc == H_BUSY); + + if (rc == H_SUCCESS) + return 0; + + pr_err("H_MODIFY_VAS_WINDOW error: %ld, winid %u lpid %u\n", + rc, win->vas_win.winid, lpid); + return -EIO; +} + +/* + * This hcall is used to determine the capabilities from the hypervisor. + * @hcall: H_QUERY_VAS_CAPABILITIES or H_QUERY_NX_CAPABILITIES + * @query_type: If 0 is passed, the hypervisor returns the overall + * capabilities which provides all feature(s) that are + * available. Then query the hypervisor to get the + * corresponding capabilities for the specific feature. + * Example: H_QUERY_VAS_CAPABILITIES provides VAS GZIP QoS + * and VAS GZIP Default capabilities. + * H_QUERY_NX_CAPABILITIES provides NX GZIP + * capabilities. + * @result: Return buffer to save capabilities. + */ +int h_query_vas_capabilities(const u64 hcall, u8 query_type, u64 result) +{ + long rc; + + rc = plpar_hcall_norets(hcall, query_type, result); + + if (rc == H_SUCCESS) + return 0; + + pr_err("HCALL(%llx) error %ld, query_type %u, result buffer 0x%llx\n", + hcall, rc, query_type, result); + return -EIO; +}