Yaya48
cf256aa081
Upstream: https://gitlab.com/qemu-project/qemu.git Upstream-Commit: d2e570cc0f97b936902a5b1b86b73c0f5998b475
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "qemu/osdep.h"
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#include "libqtest.h"
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#include "hw/i386/amd_iommu.h"
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#define CMDBUF_ADDR 0x200000
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#define CMDBUF_LEN_FIELD 8
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#define CMDBUF_ENTRIES (1U << CMDBUF_LEN_FIELD)
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static inline uint64_t amdvi_reg_readq(QTestState *s, uint64_t offset)
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{
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return qtest_readq(s, AMDVI_BASE_ADDR + offset);
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}
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static inline void amdvi_reg_writeq(QTestState *s, uint64_t offset,
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uint64_t val)
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{
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qtest_writeq(s, AMDVI_BASE_ADDR + offset, val);
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}
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static void test_cmdbuf_head_wrap(void)
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{
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QTestState *s;
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uint64_t head;
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int i;
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/* 16 bytes per command */
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struct {
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uint64_t qw0;
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uint64_t qw1;
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} cmdbuf[CMDBUF_ENTRIES];
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if (!qtest_has_machine("q35")) {
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g_test_skip("q35 machine not available");
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return;
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}
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s = qtest_init("-M q35 -device amd-iommu");
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/* fill the command buffer with COMPLETION_WAIT (no-op) commands */
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for (i = 0; i < CMDBUF_ENTRIES; i++) {
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cmdbuf[i].qw0 = (uint64_t)AMDVI_CMD_COMPLETION_WAIT << 60;
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cmdbuf[i].qw1 = 0;
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}
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qtest_memwrite(s, CMDBUF_ADDR, cmdbuf, sizeof(cmdbuf));
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/* point the IOMMU at the command buffer and set its length */
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amdvi_reg_writeq(s, AMDVI_MMIO_COMMAND_BASE,
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CMDBUF_ADDR | ((uint64_t)CMDBUF_LEN_FIELD << 56));
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/* enable the IOMMU and its command buffer processor */
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amdvi_reg_writeq(s, AMDVI_MMIO_CONTROL,
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AMDVI_MMIO_CONTROL_AMDVIEN | AMDVI_MMIO_CONTROL_CMDBUFLEN);
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/* advance tail to the last entry, consuming all but the final entry */
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amdvi_reg_writeq(s, AMDVI_MMIO_COMMAND_TAIL,
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(CMDBUF_ENTRIES - 1) * AMDVI_COMMAND_SIZE);
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/* wrap tail to 0, consuming the final entry and completing the buffer */
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amdvi_reg_writeq(s, AMDVI_MMIO_COMMAND_TAIL, 0);
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/* after consuming all entries the IOMMU must wrap CmdHeadPtr to 0 */
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head = amdvi_reg_readq(s, AMDVI_MMIO_COMMAND_HEAD);
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g_assert((head & AMDVI_MMIO_CMDBUF_HEAD_MASK) == 0);
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qtest_quit(s);
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}
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int main(int argc, char **argv)
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{
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g_test_init(&argc, &argv, NULL);
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qtest_add_func("/q35/amd-iommu/cmdbuf-head-wrap", test_cmdbuf_head_wrap);
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return g_test_run();
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}
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