471 lines
10 KiB
C
471 lines
10 KiB
C
/*
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amddev.c
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Driver for the AMD Device Exclusion Vector (DEV)
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*/
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#include <minix/driver.h>
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#include <minix/config.h>
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#include <minix/type.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <machine/vm.h>
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#include <signal.h>
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#include <minix/com.h>
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#include <minix/const.h>
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#include <minix/ipc.h>
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#include <minix/syslib.h>
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#include <minix/sysutil.h>
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#include <minix/endpoint.h>
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#include <machine/pci.h>
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/* Offsets from capability pointer */
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#define DEV_OP 4 /* Selects control/status register to access */
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#define DEV_OP_FUNC_SHIFT 8 /* Function part in OP reg. */
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#define DEV_DATA 8 /* Read/write to access reg. selected */
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/* Functions */
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#define DEVF_BASE_LO 0
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#define DEVF_BASE_HI 1
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#define DEVF_MAP 2
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#define DEVF_CAP 3
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#define DEVF_CAP_MAPS_MASK 0x00ff0000
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#define DEVF_CAP_MAPS_SHIFT 16
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#define DEVF_CAP_DOMS_MASK 0x0000ff00
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#define DEVF_CAP_DOMS_SHIFT 8
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#define DEVF_CAP_REV_MASK 0x000000ff
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#define DEVF_CAP_REV_SHIFT 0
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#define DEVF_CR 4
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#define DEVF_ERR_STATUS 5
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#define DEVF_ERR_ADDR_LO 6
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#define DEVF_ERR_ADDR_HI 7
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static int dev_devind;
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static u8_t dev_capptr;
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static u8_t *table;
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static int find_dev(int *devindp, u8_t *capaddrp);
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static u32_t read_reg(int function, int index);
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static void write_reg(int function, int index, u32_t value);
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static void init_domain(int index);
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static void init_map(unsigned int ix);
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static int do_add4pci(const message *m);
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static void add_range(phys_bytes busaddr, phys_bytes size);
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static void del_range(phys_bytes busaddr, phys_bytes size);
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static void report_exceptions(void);
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/* SEF functions and variables. */
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static void sef_local_startup(void);
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static int sef_cb_init_fresh(int type, sef_init_info_t *info);
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static void sef_cb_signal_handler(int signo);
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int main(void)
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{
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int r;
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message m;
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int ipc_status;
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/* SEF local startup. */
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sef_local_startup();
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for(;;)
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{
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report_exceptions();
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r= driver_receive(ANY, &m, &ipc_status);
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if (r != OK)
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panic("driver_receive failed: %d", r);
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if (m.m_type == IOMMU_MAP) {
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r= do_add4pci(&m);
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m.m_type= r;
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send(m.m_source, &m);
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continue;
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}
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printf("amddev: got message from %d\n", m.m_source);
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}
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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static void sef_local_startup()
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{
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/* Register init callbacks. */
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sef_setcb_init_fresh(sef_cb_init_fresh);
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sef_setcb_init_lu(sef_cb_init_fresh);
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sef_setcb_init_restart(sef_cb_init_fresh);
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/* Register live update callbacks. */
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sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
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sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
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/* Register signal callbacks. */
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sef_setcb_signal_handler(sef_cb_signal_handler);
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/* Let SEF perform startup. */
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sef_startup();
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}
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/*===========================================================================*
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* sef_cb_init_fresh *
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*===========================================================================*/
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static int sef_cb_init_fresh(int UNUSED(type), sef_init_info_t *UNUSED(info))
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{
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/* Initialize the amddev driver. */
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int r, n_maps, n_domains, revision;
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u16_t flags;
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u32_t bits;
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printf("amddev: starting\n");
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r= find_dev(&dev_devind, &dev_capptr);
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if (!r)
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return r;
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flags= pci_attr_r16(dev_devind, dev_capptr+CAP_SD_INFO);
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printf("amddev`init: flags = 0x%x\n", flags);
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bits= read_reg(DEVF_CAP, 0);
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n_maps= ((bits & DEVF_CAP_MAPS_MASK) >> DEVF_CAP_MAPS_SHIFT);
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n_domains= ((bits & DEVF_CAP_DOMS_MASK) >> DEVF_CAP_DOMS_SHIFT);
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revision= ((bits & DEVF_CAP_REV_MASK) >> DEVF_CAP_REV_SHIFT);
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printf("amddev`init: DEVF_CAP = 0x%x (%d maps, %d domains, rev 0x%x)\n",
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bits, n_maps, n_domains, revision);
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printf("status = 0x%x, addr-lo = 0x%x, addr-hi = 0x%x\n",
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read_reg(DEVF_ERR_STATUS, 0),
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read_reg(DEVF_ERR_ADDR_LO, 0),
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read_reg(DEVF_ERR_ADDR_HI, 0));
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init_domain(0);
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init_map(0);
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#if 0
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init_domain(1);
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#endif
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write_reg(DEVF_CR, 0, 0x10 | 0x8 | 0x4 | 1);
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printf("after write: DEVF_CR: 0x%x\n", read_reg(DEVF_CR, 0));
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return(OK);
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}
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/*===========================================================================*
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* sef_cb_signal_handler *
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*===========================================================================*/
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static void sef_cb_signal_handler(int signo)
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{
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int r;
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endpoint_t proc_e;
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phys_bytes base, size;
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/* Only check for termination signal, ignore anything else. */
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if (signo != SIGTERM) return;
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for (;;)
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{
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r= vm_getdma(&proc_e, &base, &size);
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if (r == -1)
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{
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if (errno != -EAGAIN)
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{
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printf(
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"amddev: vm_getdma failed: %d\n",
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errno);
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}
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break;
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}
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printf(
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"amddev: deleting 0x%lx@0x%lx for proc %d\n",
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size, base, proc_e);
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del_range(base, size);
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r= vm_deldma(proc_e, base, size);
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if (r == -1)
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{
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printf("amddev: vm_deldma failed: %d\n",
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errno);
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break;
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}
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}
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}
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/* Returns 0 if no device found, or 1 if a device is found. */
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static int find_dev(devindp, capaddrp)
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int *devindp;
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u8_t *capaddrp;
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{
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int r, devind, first;
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u8_t capptr, type, next, subtype;
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u16_t vid, did, status;
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pci_init();
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first= 1;
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for(;;)
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{
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if (first)
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{
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first= 0;
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r= pci_first_dev(&devind, &vid, &did);
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if (!r)
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{
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printf("amddev`find_dev: no first dev\n");
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return 0;
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}
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}
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else
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{
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r= pci_next_dev(&devind, &vid, &did);
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if (!r)
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{
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printf("amddev`find_dev: no next dev\n");
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return 0;
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}
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}
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printf("amddev`find_dev: got devind %d, vid 0x%x, did 0x%x\n",
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devind, vid, did);
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/* Check capabilities bit in the device status register */
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status= pci_attr_r16(devind, PCI_SR);
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if (!(status & PSR_CAPPTR))
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continue;
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capptr= (pci_attr_r8(devind, PCI_CAPPTR) & PCI_CP_MASK);
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while (capptr != 0)
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{
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type = pci_attr_r8(devind, capptr+CAP_TYPE);
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next= (pci_attr_r8(devind, capptr+CAP_NEXT) &
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PCI_CP_MASK);
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if (type == CAP_T_SECURE_DEV)
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{
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printf(
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"amddev`find_dev: found secure device\n");
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subtype= (pci_attr_r8(devind, capptr+
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CAP_SD_INFO) & CAP_SD_SUBTYPE_MASK);
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if (subtype == CAP_T_SD_DEV)
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{
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printf("amddev`find_dev: AMD DEV\n");
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pci_reserve(devind);
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*devindp= devind;
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*capaddrp= capptr;
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return 1;
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}
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}
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capptr= next;
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}
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}
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return 0;
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}
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static u32_t read_reg(int function, int index)
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{
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pci_attr_w32(dev_devind, dev_capptr + DEV_OP, ((function <<
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DEV_OP_FUNC_SHIFT) | index));
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return pci_attr_r32(dev_devind, dev_capptr + DEV_DATA);
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}
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static void write_reg(int function, int index, u32_t value)
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{
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pci_attr_w32(dev_devind, dev_capptr + DEV_OP, ((function <<
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DEV_OP_FUNC_SHIFT) | index));
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pci_attr_w32(dev_devind, dev_capptr + DEV_DATA, value);
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}
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static void init_domain(int index)
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{
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size_t size, memsize;
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phys_bytes busaddr;
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size= 0x100000 / 8;
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table= alloc_contig(size, AC_ALIGN4K, &busaddr);
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if (table == NULL)
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panic("malloc failed");
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if (index == 0)
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{
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memset(table, 0, size);
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memsize= 0x37000 / 8;
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printf("memsize = 0x%x / 8\n", memsize*8);
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memset(table, 0xff, memsize);
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}
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else
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{
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memset(table, 0xff, size);
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memset(table, 0x00, size);
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}
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printf("init_domain: busaddr = 0x%lx\n", busaddr);
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write_reg(DEVF_BASE_HI, index, 0);
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write_reg(DEVF_BASE_LO, index, busaddr | 3);
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printf("after write: DEVF_BASE_LO: 0x%x\n",
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read_reg(DEVF_BASE_LO, index));
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}
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static void init_map(unsigned int ix)
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{
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u32_t v, dom, busno, unit0, unit1;
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dom= 1;
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busno= 7;
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unit1= 9;
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unit0= 9;
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v= (dom << 26) | (dom << 20) | (busno << 12) |
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(0 << 11) | (unit1 << 6) |
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(0 << 5) | (unit0 << 0);
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write_reg(DEVF_MAP, ix, v);
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printf("after write: DEVF_MAP: 0x%x\n", read_reg(DEVF_MAP, ix));
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}
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#if 0
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static int do_add(message *m)
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{
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int r;
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endpoint_t proc;
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vir_bytes start;
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size_t size;
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phys_bytes busaddr;
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proc= m->m_source;
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start= m->m2_l1;
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size= m->m2_l2;
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#if 0
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printf("amddev`do_add: got request for 0x%x@0x%x from %d\n",
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size, start, proc);
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#endif
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if (start % I386_PAGE_SIZE)
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{
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printf("amddev`do_add: bad start 0x%x from proc %d\n",
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start, proc);
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return EINVAL;
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}
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if (size % I386_PAGE_SIZE)
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{
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printf("amddev`do_add: bad size 0x%x from proc %d\n",
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size, proc);
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return EINVAL;
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}
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r= sys_umap_remote(proc, SELF, VM_D, (vir_bytes)start, size, &busaddr);
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if (r != OK)
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{
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printf("amddev`do_add: umap failed for 0x%x@0x%x, proc %d\n",
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size, start, proc);
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return r;
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}
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add_range(busaddr, size);
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}
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#endif
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static int do_add4pci(const message *m)
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{
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int r, pci_bus, pci_dev, pci_func;
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endpoint_t proc;
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vir_bytes start;
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size_t size;
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phys_bytes busaddr;
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proc= m->m_source;
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start= m->m2_l1;
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size= m->m2_l2;
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pci_bus= m->m1_i1;
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pci_dev= m->m1_i2;
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pci_func= m->m1_i3;
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printf(
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"amddev`do_add4pci: got request for 0x%x@0x%lx from %d for pci dev %u.%u.%u\n",
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size, start, proc, pci_bus, pci_dev, pci_func);
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if (start % I386_PAGE_SIZE)
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{
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printf("amddev`do_add4pci: bad start 0x%lx from proc %d\n",
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start, proc);
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return EINVAL;
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}
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if (size % I386_PAGE_SIZE)
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{
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printf("amddev`do_add4pci: bad size 0x%x from proc %d\n",
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size, proc);
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return EINVAL;
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}
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printf("amddev`do_add4pci: should check with PCI\n");
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r= sys_umap_remote(proc, SELF, VM_D, (vir_bytes)start, size, &busaddr);
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if (r != OK)
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{
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printf(
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"amddev`do_add4pci: umap failed for 0x%x@0x%lx, proc %d: %d\n",
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size, start, proc, r);
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return r;
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}
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r= vm_adddma(proc, start, size);
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if (r != 0)
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{
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r= -errno;
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printf("amddev`do_add4pci: vm_adddma failed for 0x%x@0x%lx, "
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"proc %d: %d\n", size, start, proc, r);
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return r;
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}
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add_range(busaddr, size);
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return OK;
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}
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static void add_range(phys_bytes busaddr, phys_bytes size)
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{
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phys_bytes o;
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#if 0
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printf("add_range: mapping 0x%x@0x%x\n", size, busaddr);
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#endif
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for (o= 0; o<size; o += I386_PAGE_SIZE)
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{
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u32_t bit= (busaddr+o)/I386_PAGE_SIZE;
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table[bit/8] &= ~(1U << (bit % 8));
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}
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}
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static void del_range(phys_bytes busaddr, phys_bytes size)
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{
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phys_bytes o;
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#if 0
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printf("del_range: mapping 0x%x@0x%x\n", size, busaddr);
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#endif
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for (o= 0; o<size; o += I386_PAGE_SIZE)
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{
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u32_t bit= (busaddr+o)/I386_PAGE_SIZE;
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table[bit/8] |= (1 << (bit % 8));
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}
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}
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static void report_exceptions(void)
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{
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u32_t status;
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status= read_reg(DEVF_ERR_STATUS, 0);
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if (!(status & 0x80000000))
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return;
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printf("amddev: status = 0x%x, addr-lo = 0x%x, addr-hi = 0x%x\n",
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status, read_reg(DEVF_ERR_ADDR_LO, 0),
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read_reg(DEVF_ERR_ADDR_HI, 0));
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write_reg(DEVF_ERR_STATUS, 0, 0);
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}
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