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authorStefan Richter <stefanr@s5r6.in-berlin.de>2005-12-13 11:05:03 -0500
committerJody McIntyre <scjody@modernduck.com>2005-12-13 11:05:03 -0500
commitcf8d2c0965b891a5efce8c3a9a07a522e91ddba2 (patch)
tree76786d162a6ad96f6f788c315223c47a5e10adee /drivers
parent209171a17a908605e516d11436371337a5d87f06 (diff)
sbp2: split sbp2_create_command_orb() for better readability
sbp2_create_command_orb() code cleanup: - add two helper functions to reduce nesting depth - omit the return value which was always ignored - remove unnecessary declaration from sb2.h Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Jody McIntyre <scjody@modernduck.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ieee1394/sbp2.c355
-rw-r--r--drivers/ieee1394/sbp2.h7
2 files changed, 178 insertions, 184 deletions
diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index 5b9d03e93514..14b0c35ee9a4 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/drivers/ieee1394/sbp2.c
@@ -1707,26 +1707,184 @@ static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait)
1707 return 0; 1707 return 0;
1708} 1708}
1709 1709
1710static void sbp2_prep_command_orb_sg(struct sbp2_command_orb *orb,
1711 struct sbp2scsi_host_info *hi,
1712 struct sbp2_command_info *command,
1713 unsigned int scsi_use_sg,
1714 struct scatterlist *sgpnt,
1715 u32 orb_direction,
1716 enum dma_data_direction dma_dir)
1717{
1718 command->dma_dir = dma_dir;
1719 orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1720 orb->misc |= ORB_SET_DIRECTION(orb_direction);
1721
1722 /* Special case if only one element (and less than 64KB in size) */
1723 if ((scsi_use_sg == 1) &&
1724 (sgpnt[0].length <= SBP2_MAX_SG_ELEMENT_LENGTH)) {
1725
1726 SBP2_DEBUG("Only one s/g element");
1727 command->dma_size = sgpnt[0].length;
1728 command->dma_type = CMD_DMA_PAGE;
1729 command->cmd_dma = pci_map_page(hi->host->pdev,
1730 sgpnt[0].page,
1731 sgpnt[0].offset,
1732 command->dma_size,
1733 command->dma_dir);
1734 SBP2_DMA_ALLOC("single page scatter element");
1735
1736 orb->data_descriptor_lo = command->cmd_dma;
1737 orb->misc |= ORB_SET_DATA_SIZE(command->dma_size);
1738
1739 } else {
1740 struct sbp2_unrestricted_page_table *sg_element =
1741 &command->scatter_gather_element[0];
1742 u32 sg_count, sg_len;
1743 dma_addr_t sg_addr;
1744 int i, count = pci_map_sg(hi->host->pdev, sgpnt, scsi_use_sg,
1745 dma_dir);
1746
1747 SBP2_DMA_ALLOC("scatter list");
1748
1749 command->dma_size = scsi_use_sg;
1750 command->sge_buffer = sgpnt;
1751
1752 /* use page tables (s/g) */
1753 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
1754 orb->data_descriptor_lo = command->sge_dma;
1755
1756 /*
1757 * Loop through and fill out our sbp-2 page tables
1758 * (and split up anything too large)
1759 */
1760 for (i = 0, sg_count = 0 ; i < count; i++, sgpnt++) {
1761 sg_len = sg_dma_len(sgpnt);
1762 sg_addr = sg_dma_address(sgpnt);
1763 while (sg_len) {
1764 sg_element[sg_count].segment_base_lo = sg_addr;
1765 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
1766 sg_element[sg_count].length_segment_base_hi =
1767 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
1768 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
1769 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
1770 } else {
1771 sg_element[sg_count].length_segment_base_hi =
1772 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
1773 sg_len = 0;
1774 }
1775 sg_count++;
1776 }
1777 }
1778
1779 /* Number of page table (s/g) elements */
1780 orb->misc |= ORB_SET_DATA_SIZE(sg_count);
1781
1782 sbp2util_packet_dump(sg_element,
1783 (sizeof(struct sbp2_unrestricted_page_table)) * sg_count,
1784 "sbp2 s/g list", command->sge_dma);
1785
1786 /* Byte swap page tables if necessary */
1787 sbp2util_cpu_to_be32_buffer(sg_element,
1788 (sizeof(struct sbp2_unrestricted_page_table)) *
1789 sg_count);
1790 }
1791}
1792
1793static void sbp2_prep_command_orb_no_sg(struct sbp2_command_orb *orb,
1794 struct sbp2scsi_host_info *hi,
1795 struct sbp2_command_info *command,
1796 struct scatterlist *sgpnt,
1797 u32 orb_direction,
1798 unsigned int scsi_request_bufflen,
1799 void *scsi_request_buffer,
1800 enum dma_data_direction dma_dir)
1801{
1802 command->dma_dir = dma_dir;
1803 command->dma_size = scsi_request_bufflen;
1804 command->dma_type = CMD_DMA_SINGLE;
1805 command->cmd_dma = pci_map_single(hi->host->pdev, scsi_request_buffer,
1806 command->dma_size, command->dma_dir);
1807 orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1808 orb->misc |= ORB_SET_DIRECTION(orb_direction);
1809
1810 SBP2_DMA_ALLOC("single bulk");
1811
1812 /*
1813 * Handle case where we get a command w/o s/g enabled (but
1814 * check for transfers larger than 64K)
1815 */
1816 if (scsi_request_bufflen <= SBP2_MAX_SG_ELEMENT_LENGTH) {
1817
1818 orb->data_descriptor_lo = command->cmd_dma;
1819 orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen);
1820
1821 } else {
1822 struct sbp2_unrestricted_page_table *sg_element =
1823 &command->scatter_gather_element[0];
1824 u32 sg_count, sg_len;
1825 dma_addr_t sg_addr;
1826
1827 /*
1828 * Need to turn this into page tables, since the
1829 * buffer is too large.
1830 */
1831 orb->data_descriptor_lo = command->sge_dma;
1832
1833 /* Use page tables (s/g) */
1834 orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
1835
1836 /*
1837 * fill out our sbp-2 page tables (and split up
1838 * the large buffer)
1839 */
1840 sg_count = 0;
1841 sg_len = scsi_request_bufflen;
1842 sg_addr = command->cmd_dma;
1843 while (sg_len) {
1844 sg_element[sg_count].segment_base_lo = sg_addr;
1845 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
1846 sg_element[sg_count].length_segment_base_hi =
1847 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
1848 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
1849 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
1850 } else {
1851 sg_element[sg_count].length_segment_base_hi =
1852 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
1853 sg_len = 0;
1854 }
1855 sg_count++;
1856 }
1857
1858 /* Number of page table (s/g) elements */
1859 orb->misc |= ORB_SET_DATA_SIZE(sg_count);
1860
1861 sbp2util_packet_dump(sg_element,
1862 (sizeof(struct sbp2_unrestricted_page_table)) * sg_count,
1863 "sbp2 s/g list", command->sge_dma);
1864
1865 /* Byte swap page tables if necessary */
1866 sbp2util_cpu_to_be32_buffer(sg_element,
1867 (sizeof(struct sbp2_unrestricted_page_table)) *
1868 sg_count);
1869 }
1870}
1871
1710/* 1872/*
1711 * This function is called to create the actual command orb and s/g list 1873 * This function is called to create the actual command orb and s/g list
1712 * out of the scsi command itself. 1874 * out of the scsi command itself.
1713 */ 1875 */
1714static int sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id, 1876static void sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
1715 struct sbp2_command_info *command, 1877 struct sbp2_command_info *command,
1716 unchar *scsi_cmd, 1878 unchar *scsi_cmd,
1717 unsigned int scsi_use_sg, 1879 unsigned int scsi_use_sg,
1718 unsigned int scsi_request_bufflen, 1880 unsigned int scsi_request_bufflen,
1719 void *scsi_request_buffer, 1881 void *scsi_request_buffer,
1720 enum dma_data_direction dma_dir) 1882 enum dma_data_direction dma_dir)
1721{ 1883{
1722 struct sbp2scsi_host_info *hi = scsi_id->hi; 1884 struct sbp2scsi_host_info *hi = scsi_id->hi;
1723 struct scatterlist *sgpnt = (struct scatterlist *)scsi_request_buffer; 1885 struct scatterlist *sgpnt = (struct scatterlist *)scsi_request_buffer;
1724 struct sbp2_command_orb *command_orb = &command->command_orb; 1886 struct sbp2_command_orb *command_orb = &command->command_orb;
1725 struct sbp2_unrestricted_page_table *scatter_gather_element = 1887 u32 orb_direction;
1726 &command->scatter_gather_element[0];
1727 u32 sg_count, sg_len, orb_direction;
1728 dma_addr_t sg_addr;
1729 int i;
1730 1888
1731 /* 1889 /*
1732 * Set-up our command ORB.. 1890 * Set-up our command ORB..
@@ -1753,186 +1911,29 @@ static int sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
1753 orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER; 1911 orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
1754 } 1912 }
1755 1913
1756 /* 1914 /* Set-up our pagetable stuff */
1757 * Set-up our pagetable stuff... unfortunately, this has become
1758 * messier than I'd like. Need to clean this up a bit. ;-)
1759 */
1760 if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) { 1915 if (orb_direction == ORB_DIRECTION_NO_DATA_TRANSFER) {
1761
1762 SBP2_DEBUG("No data transfer"); 1916 SBP2_DEBUG("No data transfer");
1763
1764 /*
1765 * Handle no data transfer
1766 */
1767 command_orb->data_descriptor_hi = 0x0; 1917 command_orb->data_descriptor_hi = 0x0;
1768 command_orb->data_descriptor_lo = 0x0; 1918 command_orb->data_descriptor_lo = 0x0;
1769 command_orb->misc |= ORB_SET_DIRECTION(1); 1919 command_orb->misc |= ORB_SET_DIRECTION(1);
1770
1771 } else if (scsi_use_sg) { 1920 } else if (scsi_use_sg) {
1772
1773 SBP2_DEBUG("Use scatter/gather"); 1921 SBP2_DEBUG("Use scatter/gather");
1774 1922 sbp2_prep_command_orb_sg(command_orb, hi, command, scsi_use_sg,
1775 /* 1923 sgpnt, orb_direction, dma_dir);
1776 * Special case if only one element (and less than 64KB in size)
1777 */
1778 if ((scsi_use_sg == 1) && (sgpnt[0].length <= SBP2_MAX_SG_ELEMENT_LENGTH)) {
1779
1780 SBP2_DEBUG("Only one s/g element");
1781 command->dma_dir = dma_dir;
1782 command->dma_size = sgpnt[0].length;
1783 command->dma_type = CMD_DMA_PAGE;
1784 command->cmd_dma = pci_map_page(hi->host->pdev,
1785 sgpnt[0].page,
1786 sgpnt[0].offset,
1787 command->dma_size,
1788 command->dma_dir);
1789 SBP2_DMA_ALLOC("single page scatter element");
1790
1791 command_orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1792 command_orb->data_descriptor_lo = command->cmd_dma;
1793 command_orb->misc |= ORB_SET_DATA_SIZE(command->dma_size);
1794 command_orb->misc |= ORB_SET_DIRECTION(orb_direction);
1795
1796 } else {
1797 int count = pci_map_sg(hi->host->pdev, sgpnt, scsi_use_sg, dma_dir);
1798 SBP2_DMA_ALLOC("scatter list");
1799
1800 command->dma_size = scsi_use_sg;
1801 command->dma_dir = dma_dir;
1802 command->sge_buffer = sgpnt;
1803
1804 /* use page tables (s/g) */
1805 command_orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
1806 command_orb->misc |= ORB_SET_DIRECTION(orb_direction);
1807 command_orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1808 command_orb->data_descriptor_lo = command->sge_dma;
1809
1810 /*
1811 * Loop through and fill out our sbp-2 page tables
1812 * (and split up anything too large)
1813 */
1814 for (i = 0, sg_count = 0 ; i < count; i++, sgpnt++) {
1815 sg_len = sg_dma_len(sgpnt);
1816 sg_addr = sg_dma_address(sgpnt);
1817 while (sg_len) {
1818 scatter_gather_element[sg_count].segment_base_lo = sg_addr;
1819 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
1820 scatter_gather_element[sg_count].length_segment_base_hi =
1821 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
1822 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
1823 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
1824 } else {
1825 scatter_gather_element[sg_count].length_segment_base_hi =
1826 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
1827 sg_len = 0;
1828 }
1829 sg_count++;
1830 }
1831 }
1832
1833 /* Number of page table (s/g) elements */
1834 command_orb->misc |= ORB_SET_DATA_SIZE(sg_count);
1835
1836 sbp2util_packet_dump(scatter_gather_element,
1837 (sizeof(struct sbp2_unrestricted_page_table)) * sg_count,
1838 "sbp2 s/g list", command->sge_dma);
1839
1840 /*
1841 * Byte swap page tables if necessary
1842 */
1843 sbp2util_cpu_to_be32_buffer(scatter_gather_element,
1844 (sizeof(struct sbp2_unrestricted_page_table)) *
1845 sg_count);
1846
1847 }
1848
1849 } else { 1924 } else {
1850
1851 SBP2_DEBUG("No scatter/gather"); 1925 SBP2_DEBUG("No scatter/gather");
1852 1926 sbp2_prep_command_orb_no_sg(command_orb, hi, command, sgpnt,
1853 command->dma_dir = dma_dir; 1927 orb_direction, scsi_request_bufflen,
1854 command->dma_size = scsi_request_bufflen; 1928 scsi_request_buffer, dma_dir);
1855 command->dma_type = CMD_DMA_SINGLE;
1856 command->cmd_dma =
1857 pci_map_single(hi->host->pdev, scsi_request_buffer,
1858 command->dma_size, command->dma_dir);
1859 SBP2_DMA_ALLOC("single bulk");
1860
1861 /*
1862 * Handle case where we get a command w/o s/g enabled (but
1863 * check for transfers larger than 64K)
1864 */
1865 if (scsi_request_bufflen <= SBP2_MAX_SG_ELEMENT_LENGTH) {
1866
1867 command_orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1868 command_orb->data_descriptor_lo = command->cmd_dma;
1869 command_orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen);
1870 command_orb->misc |= ORB_SET_DIRECTION(orb_direction);
1871
1872 } else {
1873 /*
1874 * Need to turn this into page tables, since the
1875 * buffer is too large.
1876 */
1877 command_orb->data_descriptor_hi = ORB_SET_NODE_ID(hi->host->node_id);
1878 command_orb->data_descriptor_lo = command->sge_dma;
1879
1880 /* Use page tables (s/g) */
1881 command_orb->misc |= ORB_SET_PAGE_TABLE_PRESENT(0x1);
1882 command_orb->misc |= ORB_SET_DIRECTION(orb_direction);
1883
1884 /*
1885 * fill out our sbp-2 page tables (and split up
1886 * the large buffer)
1887 */
1888 sg_count = 0;
1889 sg_len = scsi_request_bufflen;
1890 sg_addr = command->cmd_dma;
1891 while (sg_len) {
1892 scatter_gather_element[sg_count].segment_base_lo = sg_addr;
1893 if (sg_len > SBP2_MAX_SG_ELEMENT_LENGTH) {
1894 scatter_gather_element[sg_count].length_segment_base_hi =
1895 PAGE_TABLE_SET_SEGMENT_LENGTH(SBP2_MAX_SG_ELEMENT_LENGTH);
1896 sg_addr += SBP2_MAX_SG_ELEMENT_LENGTH;
1897 sg_len -= SBP2_MAX_SG_ELEMENT_LENGTH;
1898 } else {
1899 scatter_gather_element[sg_count].length_segment_base_hi =
1900 PAGE_TABLE_SET_SEGMENT_LENGTH(sg_len);
1901 sg_len = 0;
1902 }
1903 sg_count++;
1904 }
1905
1906 /* Number of page table (s/g) elements */
1907 command_orb->misc |= ORB_SET_DATA_SIZE(sg_count);
1908
1909 sbp2util_packet_dump(scatter_gather_element,
1910 (sizeof(struct sbp2_unrestricted_page_table)) * sg_count,
1911 "sbp2 s/g list", command->sge_dma);
1912
1913 /*
1914 * Byte swap page tables if necessary
1915 */
1916 sbp2util_cpu_to_be32_buffer(scatter_gather_element,
1917 (sizeof(struct sbp2_unrestricted_page_table)) *
1918 sg_count);
1919
1920 }
1921
1922 } 1929 }
1923 1930
1924 /* 1931 /* Byte swap command ORB if necessary */
1925 * Byte swap command ORB if necessary
1926 */
1927 sbp2util_cpu_to_be32_buffer(command_orb, sizeof(struct sbp2_command_orb)); 1932 sbp2util_cpu_to_be32_buffer(command_orb, sizeof(struct sbp2_command_orb));
1928 1933
1929 /* 1934 /* Put our scsi command in the command ORB */
1930 * Put our scsi command in the command ORB
1931 */
1932 memset(command_orb->cdb, 0, 12); 1935 memset(command_orb->cdb, 0, 12);
1933 memcpy(command_orb->cdb, scsi_cmd, COMMAND_SIZE(*scsi_cmd)); 1936 memcpy(command_orb->cdb, scsi_cmd, COMMAND_SIZE(*scsi_cmd));
1934
1935 return 0;
1936} 1937}
1937 1938
1938/* 1939/*
diff --git a/drivers/ieee1394/sbp2.h b/drivers/ieee1394/sbp2.h
index 8e227c52b72f..900ea1d25e71 100644
--- a/drivers/ieee1394/sbp2.h
+++ b/drivers/ieee1394/sbp2.h
@@ -410,13 +410,6 @@ static int sbp2_logout_device(struct scsi_id_instance_data *scsi_id);
410static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int destid, 410static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int destid,
411 quadlet_t *data, u64 addr, size_t length, u16 flags); 411 quadlet_t *data, u64 addr, size_t length, u16 flags);
412static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait); 412static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait);
413static int sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
414 struct sbp2_command_info *command,
415 unchar *scsi_cmd,
416 unsigned int scsi_use_sg,
417 unsigned int scsi_request_bufflen,
418 void *scsi_request_buffer,
419 enum dma_data_direction dma_dir);
420static int sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id, 413static int sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id,
421 struct sbp2_command_info *command); 414 struct sbp2_command_info *command);
422static int sbp2_send_command(struct scsi_id_instance_data *scsi_id, 415static int sbp2_send_command(struct scsi_id_instance_data *scsi_id,
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 16:29:36 -0500