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- /*
- * Copyright (C) 2019 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- #include <stdint.h>
- #include <errno.h>
- #include <assert.h>
- #include <ipxe/pci.h>
- #include <ipxe/pcimsix.h>
-
- /** @file
- *
- * PCI MSI-X interrupts
- *
- */
-
- /**
- * Get MSI-X descriptor name (for debugging)
- *
- * @v cfg Configuration space offset
- * @ret name Descriptor name
- */
- static const char * pci_msix_name ( unsigned int cfg ) {
-
- switch ( cfg ) {
- case PCI_MSIX_DESC_TABLE: return "table";
- case PCI_MSIX_DESC_PBA: return "PBA";
- default: return "<UNKNOWN>";
- }
- }
-
- /**
- * Map MSI-X BAR portion
- *
- * @v pci PCI device
- * @v msix MSI-X capability
- * @v cfg Configuration space offset
- * @ret io I/O address
- */
- static void * pci_msix_ioremap ( struct pci_device *pci, struct pci_msix *msix,
- unsigned int cfg ) {
- uint32_t desc;
- unsigned int bar;
- unsigned long start;
- unsigned long offset;
- unsigned long base;
- void *io;
-
- /* Read descriptor */
- pci_read_config_dword ( pci, ( msix->cap + cfg ), &desc );
-
- /* Get BAR */
- bar = PCI_MSIX_DESC_BIR ( desc );
- offset = PCI_MSIX_DESC_OFFSET ( desc );
- start = pci_bar_start ( pci, PCI_BASE_ADDRESS ( bar ) );
- if ( ! start ) {
- DBGC ( msix, "MSI-X %p %s could not find BAR%d\n",
- msix, pci_msix_name ( cfg ), bar );
- return NULL;
- }
- base = ( start + offset );
- DBGC ( msix, "MSI-X %p %s at %#08lx (BAR%d+%#lx)\n",
- msix, pci_msix_name ( cfg ), base, bar, offset );
-
- /* Map BAR portion */
- io = ioremap ( ( start + offset ), PCI_MSIX_LEN );
- if ( ! io ) {
- DBGC ( msix, "MSI-X %p %s could not map %#08lx\n",
- msix, pci_msix_name ( cfg ), base );
- return NULL;
- }
-
- return io;
- }
-
- /**
- * Enable MSI-X interrupts
- *
- * @v pci PCI device
- * @v msix MSI-X capability
- * @ret rc Return status code
- */
- int pci_msix_enable ( struct pci_device *pci, struct pci_msix *msix ) {
- uint16_t ctrl;
- int rc;
-
- /* Locate capability */
- msix->cap = pci_find_capability ( pci, PCI_CAP_ID_MSIX );
- if ( ! msix->cap ) {
- DBGC ( msix, "MSI-X %p found no MSI-X capability in "
- PCI_FMT "\n", msix, PCI_ARGS ( pci ) );
- rc = -ENOENT;
- goto err_cap;
- }
-
- /* Extract interrupt count */
- pci_read_config_word ( pci, ( msix->cap + PCI_MSIX_CTRL ), &ctrl );
- msix->count = ( PCI_MSIX_CTRL_SIZE ( ctrl ) + 1 );
- DBGC ( msix, "MSI-X %p has %d vectors for " PCI_FMT "\n",
- msix, msix->count, PCI_ARGS ( pci ) );
-
- /* Map MSI-X table */
- msix->table = pci_msix_ioremap ( pci, msix, PCI_MSIX_DESC_TABLE );
- if ( ! msix->table ) {
- rc = -ENOENT;
- goto err_table;
- }
-
- /* Map pending bit array */
- msix->pba = pci_msix_ioremap ( pci, msix, PCI_MSIX_DESC_PBA );
- if ( ! msix->pba ) {
- rc = -ENOENT;
- goto err_pba;
- }
-
- /* Enable MSI-X */
- ctrl &= ~PCI_MSIX_CTRL_MASK;
- ctrl |= PCI_MSIX_CTRL_ENABLE;
- pci_write_config_word ( pci, ( msix->cap + PCI_MSIX_CTRL ), ctrl );
-
- return 0;
-
- iounmap ( msix->pba );
- err_pba:
- iounmap ( msix->table );
- err_table:
- err_cap:
- return rc;
- }
-
- /**
- * Disable MSI-X interrupts
- *
- * @v pci PCI device
- * @v msix MSI-X capability
- */
- void pci_msix_disable ( struct pci_device *pci, struct pci_msix *msix ) {
- uint16_t ctrl;
-
- /* Disable MSI-X */
- pci_read_config_word ( pci, ( msix->cap + PCI_MSIX_CTRL ), &ctrl );
- ctrl &= ~PCI_MSIX_CTRL_ENABLE;
- pci_write_config_word ( pci, ( msix->cap + PCI_MSIX_CTRL ), ctrl );
-
- /* Unmap pending bit array */
- iounmap ( msix->pba );
-
- /* Unmap MSI-X table */
- iounmap ( msix->table );
- }
-
- /**
- * Map MSI-X interrupt vector
- *
- * @v msix MSI-X capability
- * @v vector MSI-X vector
- * @v address Message address
- * @v data Message data
- */
- void pci_msix_map ( struct pci_msix *msix, unsigned int vector,
- physaddr_t address, uint32_t data ) {
- void *base;
-
- /* Sanity check */
- assert ( vector < msix->count );
-
- /* Map interrupt vector */
- base = ( msix->table + PCI_MSIX_VECTOR ( vector ) );
- writel ( ( address & 0xffffffffUL ), ( base + PCI_MSIX_ADDRESS_LO ) );
- if ( sizeof ( address ) > sizeof ( uint32_t ) ) {
- writel ( ( ( ( uint64_t ) address ) >> 32 ),
- ( base + PCI_MSIX_ADDRESS_HI ) );
- } else {
- writel ( 0, ( base + PCI_MSIX_ADDRESS_HI ) );
- }
- writel ( data, ( base + PCI_MSIX_DATA ) );
- }
-
- /**
- * Control MSI-X interrupt vector
- *
- * @v msix MSI-X capability
- * @v vector MSI-X vector
- * @v mask Control mask
- */
- void pci_msix_control ( struct pci_msix *msix, unsigned int vector,
- uint32_t mask ) {
- void *base;
- uint32_t ctrl;
-
- /* Mask/unmask interrupt vector */
- base = ( msix->table + PCI_MSIX_VECTOR ( vector ) );
- ctrl = readl ( base + PCI_MSIX_CONTROL );
- ctrl &= ~PCI_MSIX_CONTROL_MASK;
- ctrl |= mask;
- writel ( ctrl, ( base + PCI_MSIX_CONTROL ) );
- }
-
- /**
- * Dump MSI-X interrupt state (for debugging)
- *
- * @v msix MSI-X capability
- * @v vector MSI-X vector
- */
- void pci_msix_dump ( struct pci_msix *msix, unsigned int vector ) {
- void *base;
- uint32_t address_hi;
- uint32_t address_lo;
- physaddr_t address;
- uint32_t data;
- uint32_t ctrl;
- uint32_t pba;
-
- /* Do nothing in non-debug builds */
- if ( ! DBG_LOG )
- return;
-
- /* Mask/unmask interrupt vector */
- base = ( msix->table + PCI_MSIX_VECTOR ( vector ) );
- address_hi = readl ( base + PCI_MSIX_ADDRESS_HI );
- address_lo = readl ( base + PCI_MSIX_ADDRESS_LO );
- data = readl ( base + PCI_MSIX_DATA );
- ctrl = readl ( base + PCI_MSIX_CONTROL );
- pba = readl ( msix->pba );
- address = ( ( ( ( uint64_t ) address_hi ) << 32 ) | address_lo );
- DBGC ( msix, "MSI-X %p vector %d %#08x => %#08lx%s%s\n",
- msix, vector, data, address,
- ( ( ctrl & PCI_MSIX_CONTROL_MASK ) ? " (masked)" : "" ),
- ( ( pba & ( 1 << vector ) ) ? " (pending)" : "" ) );
- }
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